1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cds_globals.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "compiler/compilerDefinitions.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "gc/shared/genArguments.hpp"
36 #include "gc/shared/stringdedup/stringDedup.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "jvm.h"
39 #include "logging/log.hpp"
40 #include "logging/logConfiguration.hpp"
41 #include "logging/logStream.hpp"
42 #include "logging/logTag.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "nmt/nmtCommon.hpp"
45 #include "oops/compressedKlass.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/objLayout.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiAgentList.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/flags/jvmFlag.hpp"
53 #include "runtime/flags/jvmFlagAccess.hpp"
54 #include "runtime/flags/jvmFlagLimit.hpp"
55 #include "runtime/globals_extension.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepoint.hpp"
59 #include "runtime/safepointMechanism.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "services/management.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/checkedCast.hpp"
65 #include "utilities/debug.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/macros.hpp"
68 #include "utilities/parseInteger.hpp"
69 #include "utilities/powerOfTwo.hpp"
70 #include "utilities/stringUtils.hpp"
71 #include "utilities/systemMemoryBarrier.hpp"
72 #if INCLUDE_JFR
73 #include "jfr/jfr.hpp"
74 #endif
75
76 #include <limits>
77
78 static const char _default_java_launcher[] = "generic";
79
80 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
81
82 char* Arguments::_jvm_flags_file = nullptr;
83 char** Arguments::_jvm_flags_array = nullptr;
84 int Arguments::_num_jvm_flags = 0;
85 char** Arguments::_jvm_args_array = nullptr;
86 int Arguments::_num_jvm_args = 0;
87 unsigned int Arguments::_addmods_count = 0;
88 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104 bool Arguments::_has_jdwp_agent = false;
105
106 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
107
108 // These are not set by the JDK's built-in launchers, but they can be set by
109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
110 // JavaVMOption in jni.h.
111 abort_hook_t Arguments::_abort_hook = nullptr;
112 exit_hook_t Arguments::_exit_hook = nullptr;
113 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
117 SystemProperty *Arguments::_java_library_path = nullptr;
118 SystemProperty *Arguments::_java_home = nullptr;
119 SystemProperty *Arguments::_java_class_path = nullptr;
120 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
121 SystemProperty *Arguments::_vm_info = nullptr;
122
123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
124 PathString *Arguments::_boot_class_path = nullptr;
125 bool Arguments::_has_jimage = false;
126
127 char* Arguments::_ext_dirs = nullptr;
128
129 // True if -Xshare:auto option was specified.
130 static bool xshare_auto_cmd_line = false;
131
132 // True if -Xint/-Xmixed/-Xcomp were specified
133 static bool mode_flag_cmd_line = false;
134
135 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
136 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
137 if (new_value == nullptr) {
138 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
139 return false;
140 }
141 if (_value != nullptr) {
142 FreeHeap(_value);
143 }
144 _value = new_value;
145 strcpy(_value, value);
146 return true;
147 }
148
149 void PathString::append_value(const char *value) {
150 char *sp;
151 size_t len = 0;
152 if (value != nullptr) {
153 len = strlen(value);
154 if (_value != nullptr) {
155 len += strlen(_value);
156 }
157 sp = AllocateHeap(len+2, mtArguments);
158 assert(sp != nullptr, "Unable to allocate space for new append path value");
159 if (sp != nullptr) {
160 if (_value != nullptr) {
161 strcpy(sp, _value);
162 strcat(sp, os::path_separator());
163 strcat(sp, value);
164 FreeHeap(_value);
165 } else {
166 strcpy(sp, value);
167 }
168 _value = sp;
169 }
170 }
171 }
172
173 PathString::PathString(const char* value) {
174 if (value == nullptr) {
175 _value = nullptr;
176 } else {
177 _value = AllocateHeap(strlen(value)+1, mtArguments);
178 strcpy(_value, value);
179 }
180 }
181
182 PathString::~PathString() {
183 if (_value != nullptr) {
184 FreeHeap(_value);
185 _value = nullptr;
186 }
187 }
188
189 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
190 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
191 size_t len = strlen(module_name) + 1;
192 _module_name = AllocateHeap(len, mtInternal);
193 strncpy(_module_name, module_name, len); // copy the trailing null
194 _path = new PathString(path);
195 }
196
197 ModulePatchPath::~ModulePatchPath() {
198 if (_module_name != nullptr) {
199 FreeHeap(_module_name);
200 _module_name = nullptr;
201 }
202 if (_path != nullptr) {
203 delete _path;
204 _path = nullptr;
205 }
206 }
207
208 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
209 if (key == nullptr) {
210 _key = nullptr;
211 } else {
212 _key = AllocateHeap(strlen(key)+1, mtArguments);
213 strcpy(_key, key);
214 }
215 _next = nullptr;
216 _internal = internal;
217 _writeable = writeable;
218 }
219
220 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
221 // part of the option string.
222 static bool match_option(const JavaVMOption *option, const char* name,
223 const char** tail) {
224 size_t len = strlen(name);
225 if (strncmp(option->optionString, name, len) == 0) {
226 *tail = option->optionString + len;
227 return true;
228 } else {
229 return false;
230 }
231 }
232
233 // Check if 'option' matches 'name'. No "tail" is allowed.
234 static bool match_option(const JavaVMOption *option, const char* name) {
235 const char* tail = nullptr;
236 bool result = match_option(option, name, &tail);
237 if (tail != nullptr && *tail == '\0') {
238 return result;
239 } else {
240 return false;
241 }
242 }
243
244 // Return true if any of the strings in null-terminated array 'names' matches.
245 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
246 // the option must match exactly.
247 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
248 bool tail_allowed) {
249 for (/* empty */; *names != nullptr; ++names) {
250 if (match_option(option, *names, tail)) {
251 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
252 return true;
253 }
254 }
255 }
256 return false;
257 }
258
259 #if INCLUDE_JFR
260 static bool _has_jfr_option = false; // is using JFR
261
262 // return true on failure
263 static bool match_jfr_option(const JavaVMOption** option) {
264 assert((*option)->optionString != nullptr, "invariant");
265 char* tail = nullptr;
266 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
267 _has_jfr_option = true;
268 return Jfr::on_start_flight_recording_option(option, tail);
269 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
270 _has_jfr_option = true;
271 return Jfr::on_flight_recorder_option(option, tail);
272 }
273 return false;
274 }
275
276 bool Arguments::has_jfr_option() {
277 return _has_jfr_option;
278 }
279 #endif
280
281 static void logOption(const char* opt) {
282 if (PrintVMOptions) {
283 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
284 }
285 }
286
287 bool needs_module_property_warning = false;
288
289 #define MODULE_PROPERTY_PREFIX "jdk.module."
290 #define MODULE_PROPERTY_PREFIX_LEN 11
291 #define ADDEXPORTS "addexports"
292 #define ADDEXPORTS_LEN 10
293 #define ADDREADS "addreads"
294 #define ADDREADS_LEN 8
295 #define ADDOPENS "addopens"
296 #define ADDOPENS_LEN 8
297 #define PATCH "patch"
298 #define PATCH_LEN 5
299 #define ADDMODS "addmods"
300 #define ADDMODS_LEN 7
301 #define LIMITMODS "limitmods"
302 #define LIMITMODS_LEN 9
303 #define PATH "path"
304 #define PATH_LEN 4
305 #define UPGRADE_PATH "upgrade.path"
306 #define UPGRADE_PATH_LEN 12
307 #define ENABLE_NATIVE_ACCESS "enable.native.access"
308 #define ENABLE_NATIVE_ACCESS_LEN 20
309 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
310 #define ILLEGAL_NATIVE_ACCESS_LEN 21
311
312 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
313 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
314 return ((strncmp(option, property, len) == 0) &&
315 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
316 }
317
318 // Return true if property starts with "jdk.module." and its ensuing chars match
319 // any of the reserved module properties.
320 // property should be passed without the leading "-D".
321 bool Arguments::is_internal_module_property(const char* property) {
322 return internal_module_property_helper(property, false);
323 }
324
325 // Returns true if property is one of those recognized by is_internal_module_property() but
326 // is not supported by CDS archived full module graph.
327 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
328 return internal_module_property_helper(property, true);
329 }
330
331 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
332 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
333 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
334 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
335 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
336 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
337 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
338 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
339 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
340 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
341 return true;
342 }
343
344 if (!check_for_cds) {
345 // CDS notes: these properties are supported by CDS archived full module graph.
346 if (matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
347 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
348 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
349 return true;
350 }
351 }
352 }
353 return false;
354 }
355
356 // Process java launcher properties.
357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
359 // Must do this before setting up other system properties,
360 // as some of them may depend on launcher type.
361 for (int index = 0; index < args->nOptions; index++) {
362 const JavaVMOption* option = args->options + index;
363 const char* tail;
364
365 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
366 process_java_launcher_argument(tail, option->extraInfo);
367 continue;
368 }
369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
370 if (strcmp(tail, "true") == 0) {
371 _sun_java_launcher_is_altjvm = true;
372 }
373 continue;
374 }
375 }
376 }
377
378 // Initialize system properties key and value.
379 void Arguments::init_system_properties() {
380
381 // Set up _boot_class_path which is not a property but
382 // relies heavily on argument processing and the jdk.boot.class.path.append
383 // property. It is used to store the underlying boot class path.
384 _boot_class_path = new PathString(nullptr);
385
386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
387 "Java Virtual Machine Specification", false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
391
392 // Initialize the vm.info now, but it will need updating after argument parsing.
393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to nullptr and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
399 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
400 _java_home = new SystemProperty("java.home", nullptr, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414 PropertyList_add(&_system_properties, _vm_info);
415
416 // Set OS specific system properties values
417 os::init_system_properties_values();
418 }
419
420 // Update/Initialize System properties after JDK version number is known
421 void Arguments::init_version_specific_system_properties() {
422 enum { bufsz = 16 };
423 char buffer[bufsz];
424 const char* spec_vendor = "Oracle Corporation";
425 uint32_t spec_version = JDK_Version::current().major_version();
426
427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
428
429 PropertyList_add(&_system_properties,
430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.version", buffer, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
435 }
436
437 /*
438 * -XX argument processing:
439 *
440 * -XX arguments are defined in several places, such as:
441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
442 * -XX arguments are parsed in parse_argument().
443 * -XX argument bounds checking is done in check_vm_args_consistency().
444 *
445 * Over time -XX arguments may change. There are mechanisms to handle common cases:
446 *
447 * ALIASED: An option that is simply another name for another option. This is often
448 * part of the process of deprecating a flag, but not all aliases need
449 * to be deprecated.
450 *
451 * Create an alias for an option by adding the old and new option names to the
452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
453 *
454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
455 * support may be removed in the future. Both regular and aliased options may be
456 * deprecated.
457 *
458 * Add a deprecation warning for an option (or alias) by adding an entry in the
459 * "special_jvm_flags" table and setting the "deprecated_in" field.
460 * Often an option "deprecated" in one major release will
461 * be made "obsolete" in the next. In this case the entry should also have its
462 * "obsolete_in" field set.
463 *
464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
465 * on the command line. A warning is printed to let the user know that option might not
466 * be accepted in the future.
467 *
468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
469 * table and setting the "obsolete_in" field.
470 *
471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
472 * to the current JDK version. The system will flatly refuse to admit the existence of
473 * the flag. This allows a flag to die automatically over JDK releases.
474 *
475 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
477 * - Newly obsolete or expired deprecated options should have their global variable
478 * definitions removed (from globals.hpp, etc) and related implementations removed.
479 *
480 * Recommended approach for removing options:
481 *
482 * To remove options commonly used by customers (e.g. product -XX options), use
483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
484 *
485 * To remove internal options (e.g. diagnostic, experimental, develop options), use
486 * a 2-step model adding major release numbers to the obsolete and expire columns.
487 *
488 * To change the name of an option, use the alias table as well as a 2-step
489 * model adding major release numbers to the deprecate and expire columns.
490 * Think twice about aliasing commonly used customer options.
491 *
492 * There are times when it is appropriate to leave a future release number as undefined.
493 *
494 * Tests: Aliases should be tested in VMAliasOptions.java.
495 * Deprecated options should be tested in VMDeprecatedOptions.java.
496 */
497
498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
501 // the command-line as usual, but will issue a warning.
502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
503 // the command-line, while issuing a warning and ignoring the flag value.
504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
505 // existence of the flag.
506 //
507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
508 // This table ensures that the handling of options will update automatically when the JDK
509 // version is incremented, but the source code needs to be cleanup up manually:
510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
511 // variable should be removed, as well as users of the variable.
512 // - As "deprecated" options age into "obsolete" options, move the entry into the
513 // "Obsolete Flags" section of the table.
514 // - All expired options should be removed from the table.
515 static SpecialFlag const special_jvm_flags[] = {
516 // -------------- Deprecated Flags --------------
517 // --- Non-alias flags - sorted by obsolete_in then expired_in:
518 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
521 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
522 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
523 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
524 #ifdef LINUX
525 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
526 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
527 #endif
528 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
529 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
530 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
531
532 // -------------- Obsolete Flags - sorted by expired_in --------------
533
534 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
535 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
536 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
537
538 #ifdef ASSERT
539 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
540 #endif
541
542 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
543 // These entries will generate build errors. Their purpose is to test the macros.
544 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
545 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
546 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
547 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
548 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
549 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
551 #endif
552
553 { nullptr, JDK_Version(0), JDK_Version(0) }
554 };
555
556 // Flags that are aliases for other flags.
557 typedef struct {
558 const char* alias_name;
559 const char* real_name;
560 } AliasedFlag;
561
562 static AliasedFlag const aliased_jvm_flags[] = {
563 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
564 { nullptr, nullptr}
565 };
566
567 // Return true if "v" is less than "other", where "other" may be "undefined".
568 static bool version_less_than(JDK_Version v, JDK_Version other) {
569 assert(!v.is_undefined(), "must be defined");
570 if (!other.is_undefined() && v.compare(other) >= 0) {
571 return false;
572 } else {
573 return true;
574 }
575 }
576
577 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
578 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
579 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
580 flag = special_jvm_flags[i];
581 return true;
582 }
583 }
584 return false;
585 }
586
587 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
588 assert(version != nullptr, "Must provide a version buffer");
589 SpecialFlag flag;
590 if (lookup_special_flag(flag_name, flag)) {
591 if (!flag.obsolete_in.is_undefined()) {
592 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
593 *version = flag.obsolete_in;
594 // This flag may have been marked for obsoletion in this version, but we may not
595 // have actually removed it yet. Rather than ignoring it as soon as we reach
596 // this version we allow some time for the removal to happen. So if the flag
597 // still actually exists we process it as normal, but issue an adjusted warning.
598 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
599 if (real_flag != nullptr) {
600 char version_str[256];
601 version->to_string(version_str, sizeof(version_str));
602 warning("Temporarily processing option %s; support is scheduled for removal in %s",
603 flag_name, version_str);
604 return false;
605 }
606 return true;
607 }
608 }
609 }
610 return false;
611 }
612
613 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
614 assert(version != nullptr, "Must provide a version buffer");
615 SpecialFlag flag;
616 if (lookup_special_flag(flag_name, flag)) {
617 if (!flag.deprecated_in.is_undefined()) {
618 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
619 version_less_than(JDK_Version::current(), flag.expired_in)) {
620 *version = flag.deprecated_in;
621 return 1;
622 } else {
623 return -1;
624 }
625 }
626 }
627 return 0;
628 }
629
630 const char* Arguments::real_flag_name(const char *flag_name) {
631 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
632 const AliasedFlag& flag_status = aliased_jvm_flags[i];
633 if (strcmp(flag_status.alias_name, flag_name) == 0) {
634 return flag_status.real_name;
635 }
636 }
637 return flag_name;
638 }
639
640 #ifdef ASSERT
641 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
642 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
643 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
644 return true;
645 }
646 }
647 return false;
648 }
649
650 // Verifies the correctness of the entries in the special_jvm_flags table.
651 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
652 // version being earlier than the deprecation version, then a warning is issued
653 // and verification fails - by returning false. If it is detected that the table
654 // is out of date, with respect to the current version, then ideally a warning is
655 // issued but verification does not fail. This allows the VM to operate when the
656 // version is first updated, without needing to update all the impacted flags at
657 // the same time. In practice we can't issue the warning immediately when the version
658 // is updated as it occurs for every test and some tests are not prepared to handle
659 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
660 // if the check_globals flag is true, and in addition allow a grace period and only
661 // check for stale flags when we hit build 25 (which is far enough into the 6 month
662 // release cycle that all flag updates should have been processed, whilst still
663 // leaving time to make the change before RDP2).
664 // We use a gtest to call this, passing true, so that we can detect stale flags before
665 // the end of the release cycle.
666
667 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
668
669 bool Arguments::verify_special_jvm_flags(bool check_globals) {
670 bool success = true;
671 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
672 const SpecialFlag& flag = special_jvm_flags[i];
673 if (lookup_special_flag(flag.name, i)) {
674 warning("Duplicate special flag declaration \"%s\"", flag.name);
675 success = false;
676 }
677 if (flag.deprecated_in.is_undefined() &&
678 flag.obsolete_in.is_undefined()) {
679 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
680 success = false;
681 }
682
683 if (!flag.deprecated_in.is_undefined()) {
684 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
685 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
686 success = false;
687 }
688
689 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
690 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
691 success = false;
692 }
693 }
694
695 if (!flag.obsolete_in.is_undefined()) {
696 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
697 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
698 success = false;
699 }
700
701 // if flag has become obsolete it should not have a "globals" flag defined anymore.
702 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
703 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
704 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
705 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
706 success = false;
707 }
708 }
709
710 } else if (!flag.expired_in.is_undefined()) {
711 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
712 success = false;
713 }
714
715 if (!flag.expired_in.is_undefined()) {
716 // if flag has become expired it should not have a "globals" flag defined anymore.
717 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
718 !version_less_than(JDK_Version::current(), flag.expired_in)) {
719 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
720 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
721 success = false;
722 }
723 }
724 }
725 }
726 return success;
727 }
728 #endif
729
730 bool Arguments::atojulong(const char *s, julong* result) {
731 return parse_integer(s, result);
732 }
733
734 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
735 if (size < min_size) return arg_too_small;
736 if (size > max_size) return arg_too_big;
737 return arg_in_range;
738 }
739
740 // Describe an argument out of range error
741 void Arguments::describe_range_error(ArgsRange errcode) {
742 switch(errcode) {
743 case arg_too_big:
744 jio_fprintf(defaultStream::error_stream(),
745 "The specified size exceeds the maximum "
746 "representable size.\n");
747 break;
748 case arg_too_small:
749 case arg_unreadable:
750 case arg_in_range:
751 // do nothing for now
752 break;
753 default:
754 ShouldNotReachHere();
755 }
756 }
757
758 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
759 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
760 return true;
761 } else {
762 return false;
763 }
764 }
765
766 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
767 // strtod allows leading whitespace, but our flag format does not.
768 if (*value == '\0' || isspace((unsigned char) *value)) {
769 return false;
770 }
771 char* end;
772 errno = 0;
773 double v = strtod(value, &end);
774 if ((errno != 0) || (*end != 0)) {
775 return false;
776 }
777 if (g_isnan(v) || !g_isfinite(v)) {
778 // Currently we cannot handle these special values.
779 return false;
780 }
781
782 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
783 return true;
784 }
785 return false;
786 }
787
788 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
789 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
790
791 if (flag->is_int()) {
792 int v;
793 if (parse_integer(value, &v)) {
794 result = JVMFlagAccess::set_int(flag, &v, origin);
795 }
796 } else if (flag->is_uint()) {
797 uint v;
798 if (parse_integer(value, &v)) {
799 result = JVMFlagAccess::set_uint(flag, &v, origin);
800 }
801 } else if (flag->is_intx()) {
802 intx v;
803 if (parse_integer(value, &v)) {
804 result = JVMFlagAccess::set_intx(flag, &v, origin);
805 }
806 } else if (flag->is_uintx()) {
807 uintx v;
808 if (parse_integer(value, &v)) {
809 result = JVMFlagAccess::set_uintx(flag, &v, origin);
810 }
811 } else if (flag->is_uint64_t()) {
812 uint64_t v;
813 if (parse_integer(value, &v)) {
814 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
815 }
816 } else if (flag->is_size_t()) {
817 size_t v;
818 if (parse_integer(value, &v)) {
819 result = JVMFlagAccess::set_size_t(flag, &v, origin);
820 }
821 }
822
823 return result == JVMFlag::SUCCESS;
824 }
825
826 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
827 if (value[0] == '\0') {
828 value = nullptr;
829 }
830 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
831 // Contract: JVMFlag always returns a pointer that needs freeing.
832 FREE_C_HEAP_ARRAY(char, value);
833 return true;
834 }
835
836 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
837 const char* old_value = "";
838 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
839 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
840 size_t new_len = strlen(new_value);
841 const char* value;
842 char* free_this_too = nullptr;
843 if (old_len == 0) {
844 value = new_value;
845 } else if (new_len == 0) {
846 value = old_value;
847 } else {
848 size_t length = old_len + 1 + new_len + 1;
849 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
850 // each new setting adds another LINE to the switch:
851 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
852 value = buf;
853 free_this_too = buf;
854 }
855 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
856 // JVMFlag always returns a pointer that needs freeing.
857 FREE_C_HEAP_ARRAY(char, value);
858 // JVMFlag made its own copy, so I must delete my own temp. buffer.
859 FREE_C_HEAP_ARRAY(char, free_this_too);
860 return true;
861 }
862
863 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
864 const char* real_name = real_flag_name(arg);
865 JDK_Version since = JDK_Version();
866 switch (is_deprecated_flag(arg, &since)) {
867 case -1: {
868 // Obsolete or expired, so don't process normally,
869 // but allow for an obsolete flag we're still
870 // temporarily allowing.
871 if (!is_obsolete_flag(arg, &since)) {
872 return real_name;
873 }
874 // Note if we're not considered obsolete then we can't be expired either
875 // as obsoletion must come first.
876 return nullptr;
877 }
878 case 0:
879 return real_name;
880 case 1: {
881 char version[256];
882 since.to_string(version, sizeof(version));
883 if (real_name != arg) {
884 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
885 arg, version, real_name);
886 } else {
887 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
888 arg, version);
889 }
890 return real_name;
891 }
892 }
893 ShouldNotReachHere();
894 return nullptr;
895 }
896
897 #define BUFLEN 255
898
899 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
900 char name_copied[BUFLEN+1];
901 if (name[name_length] != 0) {
902 if (name_length > BUFLEN) {
903 return nullptr;
904 } else {
905 strncpy(name_copied, name, name_length);
906 name_copied[name_length] = '\0';
907 name = name_copied;
908 }
909 }
910
911 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
912 if (real_name == nullptr) {
913 return nullptr;
914 }
915 JVMFlag* flag = JVMFlag::find_flag(real_name);
916 return flag;
917 }
918
919 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
920 bool is_bool = false;
921 bool bool_val = false;
922 char c = *arg;
923 if (c == '+' || c == '-') {
924 is_bool = true;
925 bool_val = (c == '+');
926 arg++;
927 }
928
929 const char* name = arg;
930 while (true) {
931 c = *arg;
932 if (isalnum(c) || (c == '_')) {
933 ++arg;
934 } else {
935 break;
936 }
937 }
938
939 size_t name_len = size_t(arg - name);
940 if (name_len == 0) {
941 return false;
942 }
943
944 JVMFlag* flag = find_jvm_flag(name, name_len);
945 if (flag == nullptr) {
946 return false;
947 }
948
949 if (is_bool) {
950 if (*arg != 0) {
951 // Error -- extra characters such as -XX:+BoolFlag=123
952 return false;
953 }
954 return set_bool_flag(flag, bool_val, origin);
955 }
956
957 if (arg[0] == '=') {
958 const char* value = arg + 1;
959 if (flag->is_ccstr()) {
960 if (flag->ccstr_accumulates()) {
961 return append_to_string_flag(flag, value, origin);
962 } else {
963 return set_string_flag(flag, value, origin);
964 }
965 } else if (flag->is_double()) {
966 return set_fp_numeric_flag(flag, value, origin);
967 } else {
968 return set_numeric_flag(flag, value, origin);
969 }
970 }
971
972 if (arg[0] == ':' && arg[1] == '=') {
973 // -XX:Foo:=xxx will reset the string flag to the given value.
974 const char* value = arg + 2;
975 return set_string_flag(flag, value, origin);
976 }
977
978 return false;
979 }
980
981 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
982 assert(bldarray != nullptr, "illegal argument");
983
984 if (arg == nullptr) {
985 return;
986 }
987
988 int new_count = *count + 1;
989
990 // expand the array and add arg to the last element
991 if (*bldarray == nullptr) {
992 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
993 } else {
994 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
995 }
996 (*bldarray)[*count] = os::strdup_check_oom(arg);
997 *count = new_count;
998 }
999
1000 void Arguments::build_jvm_args(const char* arg) {
1001 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1002 }
1003
1004 void Arguments::build_jvm_flags(const char* arg) {
1005 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1006 }
1007
1008 // utility function to return a string that concatenates all
1009 // strings in a given char** array
1010 const char* Arguments::build_resource_string(char** args, int count) {
1011 if (args == nullptr || count == 0) {
1012 return nullptr;
1013 }
1014 size_t length = 0;
1015 for (int i = 0; i < count; i++) {
1016 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1017 }
1018 char* s = NEW_RESOURCE_ARRAY(char, length);
1019 char* dst = s;
1020 for (int j = 0; j < count; j++) {
1021 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1022 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1023 dst += offset;
1024 length -= offset;
1025 }
1026 return (const char*) s;
1027 }
1028
1029 void Arguments::print_on(outputStream* st) {
1030 st->print_cr("VM Arguments:");
1031 if (num_jvm_flags() > 0) {
1032 st->print("jvm_flags: "); print_jvm_flags_on(st);
1033 st->cr();
1034 }
1035 if (num_jvm_args() > 0) {
1036 st->print("jvm_args: "); print_jvm_args_on(st);
1037 st->cr();
1038 }
1039 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1040 if (_java_class_path != nullptr) {
1041 char* path = _java_class_path->value();
1042 size_t len = strlen(path);
1043 st->print("java_class_path (initial): ");
1044 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1045 if (len == 0) {
1046 st->print_raw_cr("<not set>");
1047 } else {
1048 st->print_raw_cr(path, len);
1049 }
1050 }
1051 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1052 }
1053
1054 void Arguments::print_summary_on(outputStream* st) {
1055 // Print the command line. Environment variables that are helpful for
1056 // reproducing the problem are written later in the hs_err file.
1057 // flags are from setting file
1058 if (num_jvm_flags() > 0) {
1059 st->print_raw("Settings File: ");
1060 print_jvm_flags_on(st);
1061 st->cr();
1062 }
1063 // args are the command line and environment variable arguments.
1064 st->print_raw("Command Line: ");
1065 if (num_jvm_args() > 0) {
1066 print_jvm_args_on(st);
1067 }
1068 // this is the classfile and any arguments to the java program
1069 if (java_command() != nullptr) {
1070 st->print("%s", java_command());
1071 }
1072 st->cr();
1073 }
1074
1075 void Arguments::print_jvm_flags_on(outputStream* st) {
1076 if (_num_jvm_flags > 0) {
1077 for (int i=0; i < _num_jvm_flags; i++) {
1078 st->print("%s ", _jvm_flags_array[i]);
1079 }
1080 }
1081 }
1082
1083 void Arguments::print_jvm_args_on(outputStream* st) {
1084 if (_num_jvm_args > 0) {
1085 for (int i=0; i < _num_jvm_args; i++) {
1086 st->print("%s ", _jvm_args_array[i]);
1087 }
1088 }
1089 }
1090
1091 bool Arguments::process_argument(const char* arg,
1092 jboolean ignore_unrecognized,
1093 JVMFlagOrigin origin) {
1094 JDK_Version since = JDK_Version();
1095
1096 if (parse_argument(arg, origin)) {
1097 return true;
1098 }
1099
1100 // Determine if the flag has '+', '-', or '=' characters.
1101 bool has_plus_minus = (*arg == '+' || *arg == '-');
1102 const char* const argname = has_plus_minus ? arg + 1 : arg;
1103
1104 size_t arg_len;
1105 const char* equal_sign = strchr(argname, '=');
1106 if (equal_sign == nullptr) {
1107 arg_len = strlen(argname);
1108 } else {
1109 arg_len = equal_sign - argname;
1110 }
1111
1112 // Only make the obsolete check for valid arguments.
1113 if (arg_len <= BUFLEN) {
1114 // Construct a string which consists only of the argument name without '+', '-', or '='.
1115 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1116 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1117 if (is_obsolete_flag(stripped_argname, &since)) {
1118 char version[256];
1119 since.to_string(version, sizeof(version));
1120 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1121 return true;
1122 }
1123 }
1124
1125 // For locked flags, report a custom error message if available.
1126 // Otherwise, report the standard unrecognized VM option.
1127 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1128 if (found_flag != nullptr) {
1129 char locked_message_buf[BUFLEN];
1130 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1131 if (strlen(locked_message_buf) != 0) {
1132 #ifdef PRODUCT
1133 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1134 if (ignore_unrecognized && mismatched) {
1135 return true;
1136 }
1137 #endif
1138 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1139 }
1140 if (found_flag->is_bool() && !has_plus_minus) {
1141 jio_fprintf(defaultStream::error_stream(),
1142 "Missing +/- setting for VM option '%s'\n", argname);
1143 } else if (!found_flag->is_bool() && has_plus_minus) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Unexpected +/- setting in VM option '%s'\n", argname);
1146 } else {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Improperly specified VM option '%s'\n", argname);
1149 }
1150 } else {
1151 if (ignore_unrecognized) {
1152 return true;
1153 }
1154 jio_fprintf(defaultStream::error_stream(),
1155 "Unrecognized VM option '%s'\n", argname);
1156 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1157 if (fuzzy_matched != nullptr) {
1158 jio_fprintf(defaultStream::error_stream(),
1159 "Did you mean '%s%s%s'?\n",
1160 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1161 fuzzy_matched->name(),
1162 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1163 }
1164 }
1165
1166 // allow for commandline "commenting out" options like -XX:#+Verbose
1167 return arg[0] == '#';
1168 }
1169
1170 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1171 FILE* stream = os::fopen(file_name, "rb");
1172 if (stream == nullptr) {
1173 if (should_exist) {
1174 jio_fprintf(defaultStream::error_stream(),
1175 "Could not open settings file %s\n", file_name);
1176 return false;
1177 } else {
1178 return true;
1179 }
1180 }
1181
1182 char token[1024];
1183 int pos = 0;
1184
1185 bool in_white_space = true;
1186 bool in_comment = false;
1187 bool in_quote = false;
1188 int quote_c = 0;
1189 bool result = true;
1190
1191 int c = getc(stream);
1192 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1193 if (in_white_space) {
1194 if (in_comment) {
1195 if (c == '\n') in_comment = false;
1196 } else {
1197 if (c == '#') in_comment = true;
1198 else if (!isspace((unsigned char) c)) {
1199 in_white_space = false;
1200 token[pos++] = checked_cast<char>(c);
1201 }
1202 }
1203 } else {
1204 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1205 // token ends at newline, or at unquoted whitespace
1206 // this allows a way to include spaces in string-valued options
1207 token[pos] = '\0';
1208 logOption(token);
1209 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1210 build_jvm_flags(token);
1211 pos = 0;
1212 in_white_space = true;
1213 in_quote = false;
1214 } else if (!in_quote && (c == '\'' || c == '"')) {
1215 in_quote = true;
1216 quote_c = c;
1217 } else if (in_quote && (c == quote_c)) {
1218 in_quote = false;
1219 } else {
1220 token[pos++] = checked_cast<char>(c);
1221 }
1222 }
1223 c = getc(stream);
1224 }
1225 if (pos > 0) {
1226 token[pos] = '\0';
1227 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1228 build_jvm_flags(token);
1229 }
1230 fclose(stream);
1231 return result;
1232 }
1233
1234 //=============================================================================================================
1235 // Parsing of properties (-D)
1236
1237 const char* Arguments::get_property(const char* key) {
1238 return PropertyList_get_value(system_properties(), key);
1239 }
1240
1241 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1242 const char* eq = strchr(prop, '=');
1243 const char* key;
1244 const char* value = "";
1245
1246 if (eq == nullptr) {
1247 // property doesn't have a value, thus use passed string
1248 key = prop;
1249 } else {
1250 // property have a value, thus extract it and save to the
1251 // allocated string
1252 size_t key_len = eq - prop;
1253 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1254
1255 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1256 key = tmp_key;
1257
1258 value = &prop[key_len + 1];
1259 }
1260
1261 if (internal == ExternalProperty) {
1262 CDSConfig::check_incompatible_property(key, value);
1263 }
1264
1265 if (strcmp(key, "java.compiler") == 0) {
1266 // we no longer support java.compiler system property, log a warning and let it get
1267 // passed to Java, like any other system property
1268 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1269 // for applications using NONE or empty value, log a more informative message
1270 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1271 } else {
1272 warning("The java.compiler system property is obsolete and no longer supported.");
1273 }
1274 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1275 // sun.java.launcher.is_altjvm property is
1276 // private and is processed in process_sun_java_launcher_properties();
1277 // the sun.java.launcher property is passed on to the java application
1278 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1279 // append is true, writable is true, internal is false
1280 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1281 WriteableProperty, ExternalProperty);
1282 } else {
1283 if (strcmp(key, "sun.java.command") == 0) {
1284 char *old_java_command = _java_command;
1285 _java_command = os::strdup_check_oom(value, mtArguments);
1286 if (old_java_command != nullptr) {
1287 os::free(old_java_command);
1288 }
1289 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1290 // If this property is set on the command line then its value will be
1291 // displayed in VM error logs as the URL at which to submit such logs.
1292 // Normally the URL displayed in error logs is different from the value
1293 // of this system property, so a different property should have been
1294 // used here, but we leave this as-is in case someone depends upon it.
1295 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1296 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1297 // its value without going through the property list or making a Java call.
1298 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1299 if (old_java_vendor_url_bug != nullptr) {
1300 os::free((void *)old_java_vendor_url_bug);
1301 }
1302 }
1303
1304 // Create new property and add at the end of the list
1305 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1306 }
1307
1308 if (key != prop) {
1309 // SystemProperty copy passed value, thus free previously allocated
1310 // memory
1311 FreeHeap((void *)key);
1312 }
1313
1314 return true;
1315 }
1316
1317 //===========================================================================================================
1318 // Setting int/mixed/comp mode flags
1319
1320 void Arguments::set_mode_flags(Mode mode) {
1321 // Set up default values for all flags.
1322 // If you add a flag to any of the branches below,
1323 // add a default value for it here.
1324 _mode = mode;
1325
1326 // Ensure Agent_OnLoad has the correct initial values.
1327 // This may not be the final mode; mode may change later in onload phase.
1328 PropertyList_unique_add(&_system_properties, "java.vm.info",
1329 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1330
1331 UseInterpreter = true;
1332 UseCompiler = true;
1333 UseLoopCounter = true;
1334
1335 // Default values may be platform/compiler dependent -
1336 // use the saved values
1337 ClipInlining = Arguments::_ClipInlining;
1338 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1339 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1340 BackgroundCompilation = Arguments::_BackgroundCompilation;
1341
1342 // Change from defaults based on mode
1343 switch (mode) {
1344 default:
1345 ShouldNotReachHere();
1346 break;
1347 case _int:
1348 UseCompiler = false;
1349 UseLoopCounter = false;
1350 AlwaysCompileLoopMethods = false;
1351 UseOnStackReplacement = false;
1352 break;
1353 case _mixed:
1354 // same as default
1355 break;
1356 case _comp:
1357 UseInterpreter = false;
1358 BackgroundCompilation = false;
1359 ClipInlining = false;
1360 break;
1361 }
1362 }
1363
1364 // Conflict: required to use shared spaces (-Xshare:on), but
1365 // incompatible command line options were chosen.
1366 void Arguments::no_shared_spaces(const char* message) {
1367 if (RequireSharedSpaces) {
1368 log_error(cds)("%s is incompatible with other specified options.",
1369 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1370 if (CDSConfig::new_aot_flags_used()) {
1371 vm_exit_during_initialization("Unable to use AOT cache", message);
1372 } else {
1373 vm_exit_during_initialization("Unable to use shared archive", message);
1374 }
1375 } else {
1376 if (CDSConfig::new_aot_flags_used()) {
1377 log_warning(cds)("Unable to use AOT cache: %s", message);
1378 } else {
1379 log_info(cds)("Unable to use shared archive: %s", message);
1380 }
1381 UseSharedSpaces = false;
1382 }
1383 }
1384
1385 static void set_object_alignment() {
1386 // Object alignment.
1387 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1388 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1389 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1390 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1391 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1392 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1393
1394 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1395 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1396
1397 // Oop encoding heap max
1398 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1399 }
1400
1401 size_t Arguments::max_heap_for_compressed_oops() {
1402 // Avoid sign flip.
1403 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1404 // We need to fit both the null page and the heap into the memory budget, while
1405 // keeping alignment constraints of the heap. To guarantee the latter, as the
1406 // null page is located before the heap, we pad the null page to the conservative
1407 // maximum alignment that the GC may ever impose upon the heap.
1408 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1409 _conservative_max_heap_alignment);
1410
1411 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1412 NOT_LP64(ShouldNotReachHere(); return 0);
1413 }
1414
1415 void Arguments::set_use_compressed_oops() {
1416 #ifdef _LP64
1417 // MaxHeapSize is not set up properly at this point, but
1418 // the only value that can override MaxHeapSize if we are
1419 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1420 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1421
1422 if (max_heap_size <= max_heap_for_compressed_oops()) {
1423 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1424 FLAG_SET_ERGO(UseCompressedOops, true);
1425 }
1426 } else {
1427 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1428 warning("Max heap size too large for Compressed Oops");
1429 FLAG_SET_DEFAULT(UseCompressedOops, false);
1430 }
1431 }
1432 #endif // _LP64
1433 }
1434
1435 void Arguments::set_conservative_max_heap_alignment() {
1436 // The conservative maximum required alignment for the heap is the maximum of
1437 // the alignments imposed by several sources: any requirements from the heap
1438 // itself and the maximum page size we may run the VM with.
1439 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1440 _conservative_max_heap_alignment = MAX4(heap_alignment,
1441 os::vm_allocation_granularity(),
1442 os::max_page_size(),
1443 GCArguments::compute_heap_alignment());
1444 }
1445
1446 jint Arguments::set_ergonomics_flags() {
1447 GCConfig::initialize();
1448
1449 set_conservative_max_heap_alignment();
1450
1451 #ifdef _LP64
1452 set_use_compressed_oops();
1453
1454 // Also checks that certain machines are slower with compressed oops
1455 // in vm_version initialization code.
1456 #endif // _LP64
1457
1458 return JNI_OK;
1459 }
1460
1461 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1462 size_t max_allocatable;
1463 size_t result = limit;
1464 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1465 // The AggressiveHeap check is a temporary workaround to avoid calling
1466 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1467 // selected. This works because AggressiveHeap implies UseParallelGC
1468 // where we know the ratio will be 1. Once the AggressiveHeap option is
1469 // removed, this can be cleaned up.
1470 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1471 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1472 result = MIN2(result, max_allocatable / fraction);
1473 }
1474 return result;
1475 }
1476
1477 // Use static initialization to get the default before parsing
1478 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1479
1480 void Arguments::set_heap_size() {
1481 julong phys_mem;
1482
1483 // If the user specified one of these options, they
1484 // want specific memory sizing so do not limit memory
1485 // based on compressed oops addressability.
1486 // Also, memory limits will be calculated based on
1487 // available os physical memory, not our MaxRAM limit,
1488 // unless MaxRAM is also specified.
1489 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1490 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1491 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1492 !FLAG_IS_DEFAULT(MaxRAM));
1493 if (override_coop_limit) {
1494 if (FLAG_IS_DEFAULT(MaxRAM)) {
1495 phys_mem = os::physical_memory();
1496 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1497 } else {
1498 phys_mem = (julong)MaxRAM;
1499 }
1500 } else {
1501 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1502 : (julong)MaxRAM;
1503 }
1504
1505 // If the maximum heap size has not been set with -Xmx,
1506 // then set it as fraction of the size of physical memory,
1507 // respecting the maximum and minimum sizes of the heap.
1508 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1509 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1510 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1511 if (reasonable_min < MaxHeapSize) {
1512 // Small physical memory, so use a minimum fraction of it for the heap
1513 reasonable_max = reasonable_min;
1514 } else {
1515 // Not-small physical memory, so require a heap at least
1516 // as large as MaxHeapSize
1517 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1518 }
1519
1520 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1521 // Limit the heap size to ErgoHeapSizeLimit
1522 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1523 }
1524
1525 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1526
1527 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1528 // An initial heap size was specified on the command line,
1529 // so be sure that the maximum size is consistent. Done
1530 // after call to limit_heap_by_allocatable_memory because that
1531 // method might reduce the allocation size.
1532 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1533 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1534 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1535 }
1536
1537 #ifdef _LP64
1538 if (UseCompressedOops || UseCompressedClassPointers) {
1539 // HeapBaseMinAddress can be greater than default but not less than.
1540 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1541 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1542 // matches compressed oops printing flags
1543 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1544 " (%zuG) which is greater than value given %zu",
1545 DefaultHeapBaseMinAddress,
1546 DefaultHeapBaseMinAddress/G,
1547 HeapBaseMinAddress);
1548 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1549 }
1550 }
1551 }
1552 if (UseCompressedOops) {
1553 // Limit the heap size to the maximum possible when using compressed oops
1554 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1555
1556 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1557 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1558 // but it should be not less than default MaxHeapSize.
1559 max_coop_heap -= HeapBaseMinAddress;
1560 }
1561
1562 // If user specified flags prioritizing os physical
1563 // memory limits, then disable compressed oops if
1564 // limits exceed max_coop_heap and UseCompressedOops
1565 // was not specified.
1566 if (reasonable_max > max_coop_heap) {
1567 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1568 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1569 " max heap %zu > compressed oop heap %zu. "
1570 "Please check the setting of MaxRAMPercentage %5.2f."
1571 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1572 FLAG_SET_ERGO(UseCompressedOops, false);
1573 } else {
1574 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1575 }
1576 }
1577 }
1578 #endif // _LP64
1579
1580 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1581 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1582 }
1583
1584 // If the minimum or initial heap_size have not been set or requested to be set
1585 // ergonomically, set them accordingly.
1586 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1587 julong reasonable_minimum = (julong)(OldSize + NewSize);
1588
1589 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1590
1591 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1592
1593 if (InitialHeapSize == 0) {
1594 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1595 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1596
1597 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1598 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1599
1600 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1601 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1602 }
1603 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1604 // synchronize with InitialHeapSize to avoid errors with the default value.
1605 if (MinHeapSize == 0) {
1606 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1607 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1608 }
1609 }
1610 }
1611
1612 // This option inspects the machine and attempts to set various
1613 // parameters to be optimal for long-running, memory allocation
1614 // intensive jobs. It is intended for machines with large
1615 // amounts of cpu and memory.
1616 jint Arguments::set_aggressive_heap_flags() {
1617 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1618 // VM, but we may not be able to represent the total physical memory
1619 // available (like having 8gb of memory on a box but using a 32bit VM).
1620 // Thus, we need to make sure we're using a julong for intermediate
1621 // calculations.
1622 julong initHeapSize;
1623 julong total_memory = os::physical_memory();
1624
1625 if (total_memory < (julong) 256 * M) {
1626 jio_fprintf(defaultStream::error_stream(),
1627 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1628 vm_exit(1);
1629 }
1630
1631 // The heap size is half of available memory, or (at most)
1632 // all of possible memory less 160mb (leaving room for the OS
1633 // when using ISM). This is the maximum; because adaptive sizing
1634 // is turned on below, the actual space used may be smaller.
1635
1636 initHeapSize = MIN2(total_memory / (julong) 2,
1637 total_memory - (julong) 160 * M);
1638
1639 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1640
1641 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1642 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1643 return JNI_EINVAL;
1644 }
1645 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1646 return JNI_EINVAL;
1647 }
1648 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1649 return JNI_EINVAL;
1650 }
1651 }
1652 if (FLAG_IS_DEFAULT(NewSize)) {
1653 // Make the young generation 3/8ths of the total heap.
1654 if (FLAG_SET_CMDLINE(NewSize,
1655 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1656 return JNI_EINVAL;
1657 }
1658 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1659 return JNI_EINVAL;
1660 }
1661 }
1662
1663 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1664 FLAG_SET_DEFAULT(UseLargePages, true);
1665 #endif
1666
1667 // Increase some data structure sizes for efficiency
1668 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1669 return JNI_EINVAL;
1670 }
1671 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1672 return JNI_EINVAL;
1673 }
1674
1675 // See the OldPLABSize comment below, but replace 'after promotion'
1676 // with 'after copying'. YoungPLABSize is the size of the survivor
1677 // space per-gc-thread buffers. The default is 4kw.
1678 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1679 return JNI_EINVAL;
1680 }
1681
1682 // OldPLABSize is the size of the buffers in the old gen that
1683 // UseParallelGC uses to promote live data that doesn't fit in the
1684 // survivor spaces. At any given time, there's one for each gc thread.
1685 // The default size is 1kw. These buffers are rarely used, since the
1686 // survivor spaces are usually big enough. For specjbb, however, there
1687 // are occasions when there's lots of live data in the young gen
1688 // and we end up promoting some of it. We don't have a definite
1689 // explanation for why bumping OldPLABSize helps, but the theory
1690 // is that a bigger PLAB results in retaining something like the
1691 // original allocation order after promotion, which improves mutator
1692 // locality. A minor effect may be that larger PLABs reduce the
1693 // number of PLAB allocation events during gc. The value of 8kw
1694 // was arrived at by experimenting with specjbb.
1695 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1696 return JNI_EINVAL;
1697 }
1698
1699 // Enable parallel GC and adaptive generation sizing
1700 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1701 return JNI_EINVAL;
1702 }
1703
1704 // Encourage steady state memory management
1705 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1706 return JNI_EINVAL;
1707 }
1708
1709 return JNI_OK;
1710 }
1711
1712 // This must be called after ergonomics.
1713 void Arguments::set_bytecode_flags() {
1714 if (!RewriteBytecodes) {
1715 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1716 }
1717 }
1718
1719 // Aggressive optimization flags
1720 jint Arguments::set_aggressive_opts_flags() {
1721 #ifdef COMPILER2
1722 if (AggressiveUnboxing) {
1723 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1724 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1725 } else if (!EliminateAutoBox) {
1726 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1727 AggressiveUnboxing = false;
1728 }
1729 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1730 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1731 } else if (!DoEscapeAnalysis) {
1732 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1733 AggressiveUnboxing = false;
1734 }
1735 }
1736 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1737 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1738 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1739 }
1740 // Feed the cache size setting into the JDK
1741 char buffer[1024];
1742 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1743 if (!add_property(buffer)) {
1744 return JNI_ENOMEM;
1745 }
1746 }
1747 #endif
1748
1749 return JNI_OK;
1750 }
1751
1752 //===========================================================================================================
1753
1754 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1755 if (_sun_java_launcher != _default_java_launcher) {
1756 os::free(const_cast<char*>(_sun_java_launcher));
1757 }
1758 _sun_java_launcher = os::strdup_check_oom(launcher);
1759 }
1760
1761 bool Arguments::created_by_java_launcher() {
1762 assert(_sun_java_launcher != nullptr, "property must have value");
1763 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1764 }
1765
1766 bool Arguments::sun_java_launcher_is_altjvm() {
1767 return _sun_java_launcher_is_altjvm;
1768 }
1769
1770 //===========================================================================================================
1771 // Parsing of main arguments
1772
1773 static unsigned int addreads_count = 0;
1774 static unsigned int addexports_count = 0;
1775 static unsigned int addopens_count = 0;
1776 static unsigned int patch_mod_count = 0;
1777 static unsigned int enable_native_access_count = 0;
1778 static bool patch_mod_javabase = false;
1779
1780 // Check the consistency of vm_init_args
1781 bool Arguments::check_vm_args_consistency() {
1782 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1783 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line, xshare_auto_cmd_line)) {
1784 return false;
1785 }
1786
1787 // Method for adding checks for flag consistency.
1788 // The intent is to warn the user of all possible conflicts,
1789 // before returning an error.
1790 // Note: Needs platform-dependent factoring.
1791 bool status = true;
1792
1793 if (TLABRefillWasteFraction == 0) {
1794 jio_fprintf(defaultStream::error_stream(),
1795 "TLABRefillWasteFraction should be a denominator, "
1796 "not %zu\n",
1797 TLABRefillWasteFraction);
1798 status = false;
1799 }
1800
1801 status = CompilerConfig::check_args_consistency(status);
1802 #if INCLUDE_JVMCI
1803 if (status && EnableJVMCI) {
1804 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1805 AddProperty, UnwriteableProperty, InternalProperty);
1806 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1807 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1808 return false;
1809 }
1810 }
1811 }
1812 #endif
1813
1814 #if INCLUDE_JFR
1815 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1816 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1817 return false;
1818 }
1819 }
1820 #endif
1821
1822 #ifndef SUPPORT_RESERVED_STACK_AREA
1823 if (StackReservedPages != 0) {
1824 FLAG_SET_CMDLINE(StackReservedPages, 0);
1825 warning("Reserved Stack Area not supported on this platform");
1826 }
1827 #endif
1828
1829 #ifndef _LP64
1830 if (LockingMode == LM_LEGACY) {
1831 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1832 // Self-forwarding in bit 3 of the mark-word conflicts
1833 // with 4-byte-aligned stack-locks.
1834 warning("Legacy locking not supported on this platform");
1835 }
1836 #endif
1837
1838 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1839 // ObjectMonitorTable requires lightweight locking.
1840 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1841 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1842 }
1843
1844 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1845 if (LockingMode == LM_MONITOR) {
1846 jio_fprintf(defaultStream::error_stream(),
1847 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1848 return false;
1849 }
1850 #endif
1851 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1854 return false;
1855 }
1856 return status;
1857 }
1858
1859 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1860 const char* option_type) {
1861 if (ignore) return false;
1862
1863 const char* spacer = " ";
1864 if (option_type == nullptr) {
1865 option_type = ++spacer; // Set both to the empty string.
1866 }
1867
1868 jio_fprintf(defaultStream::error_stream(),
1869 "Unrecognized %s%soption: %s\n", option_type, spacer,
1870 option->optionString);
1871 return true;
1872 }
1873
1874 static const char* user_assertion_options[] = {
1875 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1876 };
1877
1878 static const char* system_assertion_options[] = {
1879 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1880 };
1881
1882 bool Arguments::parse_uint(const char* value,
1883 uint* uint_arg,
1884 uint min_size) {
1885 uint n;
1886 if (!parse_integer(value, &n)) {
1887 return false;
1888 }
1889 if (n >= min_size) {
1890 *uint_arg = n;
1891 return true;
1892 } else {
1893 return false;
1894 }
1895 }
1896
1897 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1898 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1899 CDSConfig::check_internal_module_property(prop_name, prop_value);
1900 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1901 char* property = AllocateHeap(prop_len, mtArguments);
1902 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1903 if (ret < 0 || ret >= (int)prop_len) {
1904 FreeHeap(property);
1905 return false;
1906 }
1907 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1908 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1909 // that multiple occurrences of the associated flag just causes the existing property value to be
1910 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1911 // to a property after we have finished flag processing.
1912 bool added = add_property(property, WriteableProperty, internal);
1913 FreeHeap(property);
1914 return added;
1915 }
1916
1917 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1918 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1919 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1920 const unsigned int props_count_limit = 1000;
1921 const int max_digits = 3;
1922 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1923
1924 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1925 if (count < props_count_limit) {
1926 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1927 char* property = AllocateHeap(prop_len, mtArguments);
1928 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1929 if (ret < 0 || ret >= (int)prop_len) {
1930 FreeHeap(property);
1931 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1932 return false;
1933 }
1934 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1935 FreeHeap(property);
1936 return added;
1937 }
1938
1939 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1940 return false;
1941 }
1942
1943 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1944 julong* long_arg,
1945 julong min_size,
1946 julong max_size) {
1947 if (!parse_integer(s, long_arg)) return arg_unreadable;
1948 return check_memory_size(*long_arg, min_size, max_size);
1949 }
1950
1951 // Parse JavaVMInitArgs structure
1952
1953 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1954 const JavaVMInitArgs *java_tool_options_args,
1955 const JavaVMInitArgs *java_options_args,
1956 const JavaVMInitArgs *cmd_line_args) {
1957 // Save default settings for some mode flags
1958 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1959 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1960 Arguments::_ClipInlining = ClipInlining;
1961 Arguments::_BackgroundCompilation = BackgroundCompilation;
1962
1963 // Remember the default value of SharedBaseAddress.
1964 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1965
1966 // Setup flags for mixed which is the default
1967 set_mode_flags(_mixed);
1968
1969 // Parse args structure generated from java.base vm options resource
1970 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1971 if (result != JNI_OK) {
1972 return result;
1973 }
1974
1975 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1976 // variable (if present).
1977 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1978 if (result != JNI_OK) {
1979 return result;
1980 }
1981
1982 // Parse args structure generated from the command line flags.
1983 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1984 if (result != JNI_OK) {
1985 return result;
1986 }
1987
1988 // Parse args structure generated from the _JAVA_OPTIONS environment
1989 // variable (if present) (mimics classic VM)
1990 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1991 if (result != JNI_OK) {
1992 return result;
1993 }
1994
1995 // Disable CDS for exploded image
1996 if (!has_jimage()) {
1997 no_shared_spaces("CDS disabled on exploded JDK");
1998 }
1999
2000 // We need to ensure processor and memory resources have been properly
2001 // configured - which may rely on arguments we just processed - before
2002 // doing the final argument processing. Any argument processing that
2003 // needs to know about processor and memory resources must occur after
2004 // this point.
2005
2006 os::init_container_support();
2007
2008 SystemMemoryBarrier::initialize();
2009
2010 // Do final processing now that all arguments have been parsed
2011 result = finalize_vm_init_args();
2012 if (result != JNI_OK) {
2013 return result;
2014 }
2015
2016 return JNI_OK;
2017 }
2018
2019 #if !INCLUDE_JVMTI || INCLUDE_CDS
2020 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2021 // represents a valid JDWP agent. is_path==true denotes that we
2022 // are dealing with -agentpath (case where name is a path), otherwise with
2023 // -agentlib
2024 static bool valid_jdwp_agent(char *name, bool is_path) {
2025 char *_name;
2026 const char *_jdwp = "jdwp";
2027 size_t _len_jdwp, _len_prefix;
2028
2029 if (is_path) {
2030 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2031 return false;
2032 }
2033
2034 _name++; // skip past last path separator
2035 _len_prefix = strlen(JNI_LIB_PREFIX);
2036
2037 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2038 return false;
2039 }
2040
2041 _name += _len_prefix;
2042 _len_jdwp = strlen(_jdwp);
2043
2044 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2045 _name += _len_jdwp;
2046 }
2047 else {
2048 return false;
2049 }
2050
2051 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2052 return false;
2053 }
2054
2055 return true;
2056 }
2057
2058 if (strcmp(name, _jdwp) == 0) {
2059 return true;
2060 }
2061
2062 return false;
2063 }
2064 #endif
2065
2066 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2067 // --patch-module=<module>=<file>(<pathsep><file>)*
2068 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2069 // Find the equal sign between the module name and the path specification
2070 const char* module_equal = strchr(patch_mod_tail, '=');
2071 if (module_equal == nullptr) {
2072 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2073 return JNI_ERR;
2074 } else {
2075 // Pick out the module name
2076 size_t module_len = module_equal - patch_mod_tail;
2077 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2078 if (module_name != nullptr) {
2079 memcpy(module_name, patch_mod_tail, module_len);
2080 *(module_name + module_len) = '\0';
2081 // The path piece begins one past the module_equal sign
2082 add_patch_mod_prefix(module_name, module_equal + 1);
2083 FREE_C_HEAP_ARRAY(char, module_name);
2084 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2085 return JNI_ENOMEM;
2086 }
2087 } else {
2088 return JNI_ENOMEM;
2089 }
2090 }
2091 return JNI_OK;
2092 }
2093
2094 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2095 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2096 // The min and max sizes match the values in globals.hpp, but scaled
2097 // with K. The values have been chosen so that alignment with page
2098 // size doesn't change the max value, which makes the conversions
2099 // back and forth between Xss value and ThreadStackSize value easier.
2100 // The values have also been chosen to fit inside a 32-bit signed type.
2101 const julong min_ThreadStackSize = 0;
2102 const julong max_ThreadStackSize = 1 * M;
2103
2104 // Make sure the above values match the range set in globals.hpp
2105 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2106 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2107 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2108
2109 const julong min_size = min_ThreadStackSize * K;
2110 const julong max_size = max_ThreadStackSize * K;
2111
2112 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2113
2114 julong size = 0;
2115 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2116 if (errcode != arg_in_range) {
2117 bool silent = (option == nullptr); // Allow testing to silence error messages
2118 if (!silent) {
2119 jio_fprintf(defaultStream::error_stream(),
2120 "Invalid thread stack size: %s\n", option->optionString);
2121 describe_range_error(errcode);
2122 }
2123 return JNI_EINVAL;
2124 }
2125
2126 // Internally track ThreadStackSize in units of 1024 bytes.
2127 const julong size_aligned = align_up(size, K);
2128 assert(size <= size_aligned,
2129 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2130 size, size_aligned);
2131
2132 const julong size_in_K = size_aligned / K;
2133 assert(size_in_K < (julong)max_intx,
2134 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2135 size_in_K);
2136
2137 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2138 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2139 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2140 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2141 max_expanded, size_in_K);
2142
2143 *out_ThreadStackSize = (intx)size_in_K;
2144
2145 return JNI_OK;
2146 }
2147
2148 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2149 // For match_option to return remaining or value part of option string
2150 const char* tail;
2151
2152 // iterate over arguments
2153 for (int index = 0; index < args->nOptions; index++) {
2154 bool is_absolute_path = false; // for -agentpath vs -agentlib
2155
2156 const JavaVMOption* option = args->options + index;
2157
2158 if (!match_option(option, "-Djava.class.path", &tail) &&
2159 !match_option(option, "-Dsun.java.command", &tail) &&
2160 !match_option(option, "-Dsun.java.launcher", &tail)) {
2161
2162 // add all jvm options to the jvm_args string. This string
2163 // is used later to set the java.vm.args PerfData string constant.
2164 // the -Djava.class.path and the -Dsun.java.command options are
2165 // omitted from jvm_args string as each have their own PerfData
2166 // string constant object.
2167 build_jvm_args(option->optionString);
2168 }
2169
2170 // -verbose:[class/module/gc/jni]
2171 if (match_option(option, "-verbose", &tail)) {
2172 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2173 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2174 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2175 } else if (!strcmp(tail, ":module")) {
2176 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2177 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2178 } else if (!strcmp(tail, ":gc")) {
2179 if (_legacyGCLogging.lastFlag == 0) {
2180 _legacyGCLogging.lastFlag = 1;
2181 }
2182 } else if (!strcmp(tail, ":jni")) {
2183 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2184 }
2185 // -da / -ea / -disableassertions / -enableassertions
2186 // These accept an optional class/package name separated by a colon, e.g.,
2187 // -da:java.lang.Thread.
2188 } else if (match_option(option, user_assertion_options, &tail, true)) {
2189 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2190 if (*tail == '\0') {
2191 JavaAssertions::setUserClassDefault(enable);
2192 } else {
2193 assert(*tail == ':', "bogus match by match_option()");
2194 JavaAssertions::addOption(tail + 1, enable);
2195 }
2196 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2197 } else if (match_option(option, system_assertion_options, &tail, false)) {
2198 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2199 JavaAssertions::setSystemClassDefault(enable);
2200 // -bootclasspath:
2201 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2202 jio_fprintf(defaultStream::output_stream(),
2203 "-Xbootclasspath is no longer a supported option.\n");
2204 return JNI_EINVAL;
2205 // -bootclasspath/a:
2206 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2207 Arguments::append_sysclasspath(tail);
2208 // -bootclasspath/p:
2209 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2210 jio_fprintf(defaultStream::output_stream(),
2211 "-Xbootclasspath/p is no longer a supported option.\n");
2212 return JNI_EINVAL;
2213 // -Xrun
2214 } else if (match_option(option, "-Xrun", &tail)) {
2215 if (tail != nullptr) {
2216 const char* pos = strchr(tail, ':');
2217 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2218 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2219 jio_snprintf(name, len + 1, "%s", tail);
2220
2221 char *options = nullptr;
2222 if(pos != nullptr) {
2223 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2224 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2225 }
2226 #if !INCLUDE_JVMTI
2227 if (strcmp(name, "jdwp") == 0) {
2228 jio_fprintf(defaultStream::error_stream(),
2229 "Debugging agents are not supported in this VM\n");
2230 return JNI_ERR;
2231 }
2232 #endif // !INCLUDE_JVMTI
2233 JvmtiAgentList::add_xrun(name, options, false);
2234 FREE_C_HEAP_ARRAY(char, name);
2235 FREE_C_HEAP_ARRAY(char, options);
2236 }
2237 } else if (match_option(option, "--add-reads=", &tail)) {
2238 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2239 return JNI_ENOMEM;
2240 }
2241 } else if (match_option(option, "--add-exports=", &tail)) {
2242 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2243 return JNI_ENOMEM;
2244 }
2245 } else if (match_option(option, "--add-opens=", &tail)) {
2246 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2247 return JNI_ENOMEM;
2248 }
2249 } else if (match_option(option, "--add-modules=", &tail)) {
2250 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2251 return JNI_ENOMEM;
2252 }
2253 } else if (match_option(option, "--enable-native-access=", &tail)) {
2254 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2255 return JNI_ENOMEM;
2256 }
2257 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2258 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2259 return JNI_ENOMEM;
2260 }
2261 } else if (match_option(option, "--limit-modules=", &tail)) {
2262 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2263 return JNI_ENOMEM;
2264 }
2265 } else if (match_option(option, "--module-path=", &tail)) {
2266 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2267 return JNI_ENOMEM;
2268 }
2269 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2270 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2271 return JNI_ENOMEM;
2272 }
2273 } else if (match_option(option, "--patch-module=", &tail)) {
2274 // --patch-module=<module>=<file>(<pathsep><file>)*
2275 int res = process_patch_mod_option(tail);
2276 if (res != JNI_OK) {
2277 return res;
2278 }
2279 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2280 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2281 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2282 AddProperty, WriteableProperty, InternalProperty);
2283 } else {
2284 jio_fprintf(defaultStream::error_stream(),
2285 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2286 return JNI_ERR;
2287 }
2288 } else if (match_option(option, "--illegal-access=", &tail)) {
2289 char version[256];
2290 JDK_Version::jdk(17).to_string(version, sizeof(version));
2291 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2292 // -agentlib and -agentpath
2293 } else if (match_option(option, "-agentlib:", &tail) ||
2294 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2295 if(tail != nullptr) {
2296 const char* pos = strchr(tail, '=');
2297 char* name;
2298 if (pos == nullptr) {
2299 name = os::strdup_check_oom(tail, mtArguments);
2300 } else {
2301 size_t len = pos - tail;
2302 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2303 memcpy(name, tail, len);
2304 name[len] = '\0';
2305 }
2306
2307 char *options = nullptr;
2308 if(pos != nullptr) {
2309 options = os::strdup_check_oom(pos + 1, mtArguments);
2310 }
2311 #if !INCLUDE_JVMTI
2312 if (valid_jdwp_agent(name, is_absolute_path)) {
2313 jio_fprintf(defaultStream::error_stream(),
2314 "Debugging agents are not supported in this VM\n");
2315 return JNI_ERR;
2316 }
2317 #elif INCLUDE_CDS
2318 if (valid_jdwp_agent(name, is_absolute_path)) {
2319 _has_jdwp_agent = true;
2320 }
2321 #endif // !INCLUDE_JVMTI
2322 JvmtiAgentList::add(name, options, is_absolute_path);
2323 os::free(name);
2324 os::free(options);
2325 }
2326 // -javaagent
2327 } else if (match_option(option, "-javaagent:", &tail)) {
2328 #if !INCLUDE_JVMTI
2329 jio_fprintf(defaultStream::error_stream(),
2330 "Instrumentation agents are not supported in this VM\n");
2331 return JNI_ERR;
2332 #else
2333 if (tail != nullptr) {
2334 size_t length = strlen(tail) + 1;
2335 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2336 jio_snprintf(options, length, "%s", tail);
2337 JvmtiAgentList::add("instrument", options, false);
2338 FREE_C_HEAP_ARRAY(char, options);
2339
2340 // java agents need module java.instrument
2341 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2342 return JNI_ENOMEM;
2343 }
2344 }
2345 #endif // !INCLUDE_JVMTI
2346 // --enable_preview
2347 } else if (match_option(option, "--enable-preview")) {
2348 set_enable_preview();
2349 // -Xnoclassgc
2350 } else if (match_option(option, "-Xnoclassgc")) {
2351 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2352 return JNI_EINVAL;
2353 }
2354 // -Xbatch
2355 } else if (match_option(option, "-Xbatch")) {
2356 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2357 return JNI_EINVAL;
2358 }
2359 // -Xmn for compatibility with other JVM vendors
2360 } else if (match_option(option, "-Xmn", &tail)) {
2361 julong long_initial_young_size = 0;
2362 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2363 if (errcode != arg_in_range) {
2364 jio_fprintf(defaultStream::error_stream(),
2365 "Invalid initial young generation size: %s\n", option->optionString);
2366 describe_range_error(errcode);
2367 return JNI_EINVAL;
2368 }
2369 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2370 return JNI_EINVAL;
2371 }
2372 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2373 return JNI_EINVAL;
2374 }
2375 // -Xms
2376 } else if (match_option(option, "-Xms", &tail)) {
2377 julong size = 0;
2378 // an initial heap size of 0 means automatically determine
2379 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2380 if (errcode != arg_in_range) {
2381 jio_fprintf(defaultStream::error_stream(),
2382 "Invalid initial heap size: %s\n", option->optionString);
2383 describe_range_error(errcode);
2384 return JNI_EINVAL;
2385 }
2386 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2387 return JNI_EINVAL;
2388 }
2389 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2390 return JNI_EINVAL;
2391 }
2392 // -Xmx
2393 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2394 julong long_max_heap_size = 0;
2395 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2396 if (errcode != arg_in_range) {
2397 jio_fprintf(defaultStream::error_stream(),
2398 "Invalid maximum heap size: %s\n", option->optionString);
2399 describe_range_error(errcode);
2400 return JNI_EINVAL;
2401 }
2402 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2403 return JNI_EINVAL;
2404 }
2405 // Xmaxf
2406 } else if (match_option(option, "-Xmaxf", &tail)) {
2407 char* err;
2408 int maxf = (int)(strtod(tail, &err) * 100);
2409 if (*err != '\0' || *tail == '\0') {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "Bad max heap free percentage size: %s\n",
2412 option->optionString);
2413 return JNI_EINVAL;
2414 } else {
2415 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2416 return JNI_EINVAL;
2417 }
2418 }
2419 // Xminf
2420 } else if (match_option(option, "-Xminf", &tail)) {
2421 char* err;
2422 int minf = (int)(strtod(tail, &err) * 100);
2423 if (*err != '\0' || *tail == '\0') {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "Bad min heap free percentage size: %s\n",
2426 option->optionString);
2427 return JNI_EINVAL;
2428 } else {
2429 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 }
2433 // -Xss
2434 } else if (match_option(option, "-Xss", &tail)) {
2435 intx value = 0;
2436 jint err = parse_xss(option, tail, &value);
2437 if (err != JNI_OK) {
2438 return err;
2439 }
2440 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2441 return JNI_EINVAL;
2442 }
2443 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2444 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2445 julong long_ReservedCodeCacheSize = 0;
2446
2447 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2448 if (errcode != arg_in_range) {
2449 jio_fprintf(defaultStream::error_stream(),
2450 "Invalid maximum code cache size: %s.\n", option->optionString);
2451 return JNI_EINVAL;
2452 }
2453 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 // -green
2457 } else if (match_option(option, "-green")) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Green threads support not available\n");
2460 return JNI_EINVAL;
2461 // -native
2462 } else if (match_option(option, "-native")) {
2463 // HotSpot always uses native threads, ignore silently for compatibility
2464 // -Xrs
2465 } else if (match_option(option, "-Xrs")) {
2466 // Classic/EVM option, new functionality
2467 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2468 return JNI_EINVAL;
2469 }
2470 // -Xprof
2471 } else if (match_option(option, "-Xprof")) {
2472 char version[256];
2473 // Obsolete in JDK 10
2474 JDK_Version::jdk(10).to_string(version, sizeof(version));
2475 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2476 // -Xinternalversion
2477 } else if (match_option(option, "-Xinternalversion")) {
2478 jio_fprintf(defaultStream::output_stream(), "%s\n",
2479 VM_Version::internal_vm_info_string());
2480 vm_exit(0);
2481 #ifndef PRODUCT
2482 // -Xprintflags
2483 } else if (match_option(option, "-Xprintflags")) {
2484 JVMFlag::printFlags(tty, false);
2485 vm_exit(0);
2486 #endif
2487 // -D
2488 } else if (match_option(option, "-D", &tail)) {
2489 const char* value;
2490 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2491 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2492 // abort if -Djava.endorsed.dirs is set
2493 jio_fprintf(defaultStream::output_stream(),
2494 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2495 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2496 return JNI_EINVAL;
2497 }
2498 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2499 *value != '\0' && strcmp(value, "\"\"") != 0) {
2500 // abort if -Djava.ext.dirs is set
2501 jio_fprintf(defaultStream::output_stream(),
2502 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2503 return JNI_EINVAL;
2504 }
2505 // Check for module related properties. They must be set using the modules
2506 // options. For example: use "--add-modules=java.sql", not
2507 // "-Djdk.module.addmods=java.sql"
2508 if (is_internal_module_property(option->optionString + 2)) {
2509 needs_module_property_warning = true;
2510 continue;
2511 }
2512 if (!add_property(tail)) {
2513 return JNI_ENOMEM;
2514 }
2515 // Out of the box management support
2516 if (match_option(option, "-Dcom.sun.management", &tail)) {
2517 #if INCLUDE_MANAGEMENT
2518 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2519 return JNI_EINVAL;
2520 }
2521 // management agent in module jdk.management.agent
2522 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2523 return JNI_ENOMEM;
2524 }
2525 #else
2526 jio_fprintf(defaultStream::output_stream(),
2527 "-Dcom.sun.management is not supported in this VM.\n");
2528 return JNI_ERR;
2529 #endif
2530 }
2531 // -Xint
2532 } else if (match_option(option, "-Xint")) {
2533 set_mode_flags(_int);
2534 mode_flag_cmd_line = true;
2535 // -Xmixed
2536 } else if (match_option(option, "-Xmixed")) {
2537 set_mode_flags(_mixed);
2538 mode_flag_cmd_line = true;
2539 // -Xcomp
2540 } else if (match_option(option, "-Xcomp")) {
2541 // for testing the compiler; turn off all flags that inhibit compilation
2542 set_mode_flags(_comp);
2543 mode_flag_cmd_line = true;
2544 // -Xshare:dump
2545 } else if (match_option(option, "-Xshare:dump")) {
2546 CDSConfig::enable_dumping_static_archive();
2547 CDSConfig::set_old_cds_flags_used();
2548 // -Xshare:on
2549 } else if (match_option(option, "-Xshare:on")) {
2550 UseSharedSpaces = true;
2551 RequireSharedSpaces = true;
2552 CDSConfig::set_old_cds_flags_used();
2553 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2554 } else if (match_option(option, "-Xshare:auto")) {
2555 UseSharedSpaces = true;
2556 RequireSharedSpaces = false;
2557 xshare_auto_cmd_line = true;
2558 CDSConfig::set_old_cds_flags_used();
2559 // -Xshare:off
2560 } else if (match_option(option, "-Xshare:off")) {
2561 UseSharedSpaces = false;
2562 RequireSharedSpaces = false;
2563 CDSConfig::set_old_cds_flags_used();
2564 // -Xverify
2565 } else if (match_option(option, "-Xverify", &tail)) {
2566 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2567 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2568 return JNI_EINVAL;
2569 }
2570 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2571 return JNI_EINVAL;
2572 }
2573 } else if (strcmp(tail, ":remote") == 0) {
2574 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2578 return JNI_EINVAL;
2579 }
2580 } else if (strcmp(tail, ":none") == 0) {
2581 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2582 return JNI_EINVAL;
2583 }
2584 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2585 return JNI_EINVAL;
2586 }
2587 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2588 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2589 return JNI_EINVAL;
2590 }
2591 // -Xdebug
2592 } else if (match_option(option, "-Xdebug")) {
2593 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2594 } else if (match_option(option, "-Xloggc:", &tail)) {
2595 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2596 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2597 _legacyGCLogging.lastFlag = 2;
2598 _legacyGCLogging.file = os::strdup_check_oom(tail);
2599 } else if (match_option(option, "-Xlog", &tail)) {
2600 bool ret = false;
2601 if (strcmp(tail, ":help") == 0) {
2602 fileStream stream(defaultStream::output_stream());
2603 LogConfiguration::print_command_line_help(&stream);
2604 vm_exit(0);
2605 } else if (strcmp(tail, ":disable") == 0) {
2606 LogConfiguration::disable_logging();
2607 ret = true;
2608 } else if (strcmp(tail, ":async") == 0) {
2609 LogConfiguration::set_async_mode(true);
2610 ret = true;
2611 } else if (*tail == '\0') {
2612 ret = LogConfiguration::parse_command_line_arguments();
2613 assert(ret, "-Xlog without arguments should never fail to parse");
2614 } else if (*tail == ':') {
2615 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2616 }
2617 if (ret == false) {
2618 jio_fprintf(defaultStream::error_stream(),
2619 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2620 tail);
2621 return JNI_EINVAL;
2622 }
2623 // JNI hooks
2624 } else if (match_option(option, "-Xcheck", &tail)) {
2625 if (!strcmp(tail, ":jni")) {
2626 #if !INCLUDE_JNI_CHECK
2627 warning("JNI CHECKING is not supported in this VM");
2628 #else
2629 CheckJNICalls = true;
2630 #endif // INCLUDE_JNI_CHECK
2631 } else if (is_bad_option(option, args->ignoreUnrecognized,
2632 "check")) {
2633 return JNI_EINVAL;
2634 }
2635 } else if (match_option(option, "vfprintf")) {
2636 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2637 } else if (match_option(option, "exit")) {
2638 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2639 } else if (match_option(option, "abort")) {
2640 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2641 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2642 // and the last option wins.
2643 } else if (match_option(option, "-XX:+NeverTenure")) {
2644 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2645 return JNI_EINVAL;
2646 }
2647 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2648 return JNI_EINVAL;
2649 }
2650 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2651 return JNI_EINVAL;
2652 }
2653 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2654 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2655 return JNI_EINVAL;
2656 }
2657 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2658 return JNI_EINVAL;
2659 }
2660 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2664 uint max_tenuring_thresh = 0;
2665 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2666 jio_fprintf(defaultStream::error_stream(),
2667 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2668 return JNI_EINVAL;
2669 }
2670
2671 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2672 return JNI_EINVAL;
2673 }
2674
2675 if (MaxTenuringThreshold == 0) {
2676 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 } else {
2683 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 }
2690 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2691 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2692 return JNI_EINVAL;
2693 }
2694 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2698 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2705 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2712 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 } else if (match_option(option, "--finalization=", &tail)) {
2719 if (strcmp(tail, "enabled") == 0) {
2720 InstanceKlass::set_finalization_enabled(true);
2721 } else if (strcmp(tail, "disabled") == 0) {
2722 InstanceKlass::set_finalization_enabled(false);
2723 } else {
2724 jio_fprintf(defaultStream::error_stream(),
2725 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2726 tail);
2727 return JNI_EINVAL;
2728 }
2729 #if !defined(DTRACE_ENABLED)
2730 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2731 jio_fprintf(defaultStream::error_stream(),
2732 "DTraceMethodProbes flag is not applicable for this configuration\n");
2733 return JNI_EINVAL;
2734 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2735 jio_fprintf(defaultStream::error_stream(),
2736 "DTraceAllocProbes flag is not applicable for this configuration\n");
2737 return JNI_EINVAL;
2738 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2739 jio_fprintf(defaultStream::error_stream(),
2740 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2741 return JNI_EINVAL;
2742 #endif // !defined(DTRACE_ENABLED)
2743 #ifdef ASSERT
2744 } else if (match_option(option, "-XX:+FullGCALot")) {
2745 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 #endif
2749 #if !INCLUDE_MANAGEMENT
2750 } else if (match_option(option, "-XX:+ManagementServer")) {
2751 jio_fprintf(defaultStream::error_stream(),
2752 "ManagementServer is not supported in this VM.\n");
2753 return JNI_ERR;
2754 #endif // INCLUDE_MANAGEMENT
2755 #if INCLUDE_JVMCI
2756 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2757 if (EnableJVMCIProduct) {
2758 jio_fprintf(defaultStream::error_stream(),
2759 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2760 return JNI_EINVAL;
2761 }
2762 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2763 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2764 if (use_graal_jit) {
2765 const char* jvmci_compiler = get_property("jvmci.Compiler");
2766 if (jvmci_compiler != nullptr) {
2767 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2770 return JNI_ERR;
2771 }
2772 } else if (!add_property("jvmci.Compiler=graal")) {
2773 return JNI_ENOMEM;
2774 }
2775 }
2776
2777 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2778 if (EnableJVMCIProduct) {
2779 continue;
2780 }
2781 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2782 // Allow this flag if it has been unlocked.
2783 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2784 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2785 jio_fprintf(defaultStream::error_stream(),
2786 "Unable to enable JVMCI in product mode\n");
2787 return JNI_ERR;
2788 }
2789 }
2790 // The flag was locked so process normally to report that error
2791 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2792 return JNI_EINVAL;
2793 }
2794 #endif // INCLUDE_JVMCI
2795 #if INCLUDE_JFR
2796 } else if (match_jfr_option(&option)) {
2797 return JNI_EINVAL;
2798 #endif
2799 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2800 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2801 // already been handled
2802 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2803 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2804 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2805 return JNI_EINVAL;
2806 }
2807 }
2808 // Unknown option
2809 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2810 return JNI_ERR;
2811 }
2812 }
2813
2814 // PrintSharedArchiveAndExit will turn on
2815 // -Xshare:on
2816 // -Xlog:class+path=info
2817 if (PrintSharedArchiveAndExit) {
2818 UseSharedSpaces = true;
2819 RequireSharedSpaces = true;
2820 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2821 }
2822
2823 fix_appclasspath();
2824
2825 return JNI_OK;
2826 }
2827
2828 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2829 // For java.base check for duplicate --patch-module options being specified on the command line.
2830 // This check is only required for java.base, all other duplicate module specifications
2831 // will be checked during module system initialization. The module system initialization
2832 // will throw an ExceptionInInitializerError if this situation occurs.
2833 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2834 if (patch_mod_javabase) {
2835 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2836 } else {
2837 patch_mod_javabase = true;
2838 }
2839 }
2840
2841 // Create GrowableArray lazily, only if --patch-module has been specified
2842 if (_patch_mod_prefix == nullptr) {
2843 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2844 }
2845
2846 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2847 }
2848
2849 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2850 //
2851 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2852 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2853 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2854 // path is treated as the current directory.
2855 //
2856 // This causes problems with CDS, which requires that all directories specified in the classpath
2857 // must be empty. In most cases, applications do NOT want to load classes from the current
2858 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2859 // scripts compatible with CDS.
2860 void Arguments::fix_appclasspath() {
2861 if (IgnoreEmptyClassPaths) {
2862 const char separator = *os::path_separator();
2863 const char* src = _java_class_path->value();
2864
2865 // skip over all the leading empty paths
2866 while (*src == separator) {
2867 src ++;
2868 }
2869
2870 char* copy = os::strdup_check_oom(src, mtArguments);
2871
2872 // trim all trailing empty paths
2873 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2874 *tail = '\0';
2875 }
2876
2877 char from[3] = {separator, separator, '\0'};
2878 char to [2] = {separator, '\0'};
2879 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2880 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2881 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2882 }
2883
2884 _java_class_path->set_writeable_value(copy);
2885 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2886 }
2887 }
2888
2889 jint Arguments::finalize_vm_init_args() {
2890 // check if the default lib/endorsed directory exists; if so, error
2891 char path[JVM_MAXPATHLEN];
2892 const char* fileSep = os::file_separator();
2893 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2894
2895 DIR* dir = os::opendir(path);
2896 if (dir != nullptr) {
2897 jio_fprintf(defaultStream::output_stream(),
2898 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2899 "in modular form will be supported via the concept of upgradeable modules.\n");
2900 os::closedir(dir);
2901 return JNI_ERR;
2902 }
2903
2904 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2905 dir = os::opendir(path);
2906 if (dir != nullptr) {
2907 jio_fprintf(defaultStream::output_stream(),
2908 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2909 "Use -classpath instead.\n.");
2910 os::closedir(dir);
2911 return JNI_ERR;
2912 }
2913
2914 // This must be done after all arguments have been processed
2915 // and the container support has been initialized since AggressiveHeap
2916 // relies on the amount of total memory available.
2917 if (AggressiveHeap) {
2918 jint result = set_aggressive_heap_flags();
2919 if (result != JNI_OK) {
2920 return result;
2921 }
2922 }
2923
2924 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2925 // but like -Xint, leave compilation thresholds unaffected.
2926 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2927 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2928 set_mode_flags(_int);
2929 }
2930
2931 #ifdef ZERO
2932 // Zero always runs in interpreted mode
2933 set_mode_flags(_int);
2934 #endif
2935
2936 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2937 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2938 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2939 }
2940
2941 #if !COMPILER2_OR_JVMCI
2942 // Don't degrade server performance for footprint
2943 if (FLAG_IS_DEFAULT(UseLargePages) &&
2944 MaxHeapSize < LargePageHeapSizeThreshold) {
2945 // No need for large granularity pages w/small heaps.
2946 // Note that large pages are enabled/disabled for both the
2947 // Java heap and the code cache.
2948 FLAG_SET_DEFAULT(UseLargePages, false);
2949 }
2950
2951 UNSUPPORTED_OPTION(ProfileInterpreter);
2952 #endif
2953
2954 // Parse the CompilationMode flag
2955 if (!CompilationModeFlag::initialize()) {
2956 return JNI_ERR;
2957 }
2958
2959 if (!check_vm_args_consistency()) {
2960 return JNI_ERR;
2961 }
2962
2963 if (StoreCachedCode) {
2964 FLAG_SET_ERGO_IF_DEFAULT(CachedCodeMaxSize, 512*M);
2965 }
2966
2967 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2968 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2969 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2970
2971 return JNI_OK;
2972 }
2973
2974 // Helper class for controlling the lifetime of JavaVMInitArgs
2975 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2976 // deleted on the destruction of the ScopedVMInitArgs object.
2977 class ScopedVMInitArgs : public StackObj {
2978 private:
2979 JavaVMInitArgs _args;
2980 char* _container_name;
2981 bool _is_set;
2982 char* _vm_options_file_arg;
2983
2984 public:
2985 ScopedVMInitArgs(const char *container_name) {
2986 _args.version = JNI_VERSION_1_2;
2987 _args.nOptions = 0;
2988 _args.options = nullptr;
2989 _args.ignoreUnrecognized = false;
2990 _container_name = (char *)container_name;
2991 _is_set = false;
2992 _vm_options_file_arg = nullptr;
2993 }
2994
2995 // Populates the JavaVMInitArgs object represented by this
2996 // ScopedVMInitArgs object with the arguments in options. The
2997 // allocated memory is deleted by the destructor. If this method
2998 // returns anything other than JNI_OK, then this object is in a
2999 // partially constructed state, and should be abandoned.
3000 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3001 _is_set = true;
3002 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3003 JavaVMOption, options->length(), mtArguments);
3004 if (options_arr == nullptr) {
3005 return JNI_ENOMEM;
3006 }
3007 _args.options = options_arr;
3008
3009 for (int i = 0; i < options->length(); i++) {
3010 options_arr[i] = options->at(i);
3011 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3012 if (options_arr[i].optionString == nullptr) {
3013 // Rely on the destructor to do cleanup.
3014 _args.nOptions = i;
3015 return JNI_ENOMEM;
3016 }
3017 }
3018
3019 _args.nOptions = options->length();
3020 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3021 return JNI_OK;
3022 }
3023
3024 JavaVMInitArgs* get() { return &_args; }
3025 char* container_name() { return _container_name; }
3026 bool is_set() { return _is_set; }
3027 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3028 char* vm_options_file_arg() { return _vm_options_file_arg; }
3029
3030 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3031 if (_vm_options_file_arg != nullptr) {
3032 os::free(_vm_options_file_arg);
3033 }
3034 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3035 }
3036
3037 ~ScopedVMInitArgs() {
3038 if (_vm_options_file_arg != nullptr) {
3039 os::free(_vm_options_file_arg);
3040 }
3041 if (_args.options == nullptr) return;
3042 for (int i = 0; i < _args.nOptions; i++) {
3043 os::free(_args.options[i].optionString);
3044 }
3045 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3046 }
3047
3048 // Insert options into this option list, to replace option at
3049 // vm_options_file_pos (-XX:VMOptionsFile)
3050 jint insert(const JavaVMInitArgs* args,
3051 const JavaVMInitArgs* args_to_insert,
3052 const int vm_options_file_pos) {
3053 assert(_args.options == nullptr, "shouldn't be set yet");
3054 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3055 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3056
3057 int length = args->nOptions + args_to_insert->nOptions - 1;
3058 // Construct new option array
3059 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3060 for (int i = 0; i < args->nOptions; i++) {
3061 if (i == vm_options_file_pos) {
3062 // insert the new options starting at the same place as the
3063 // -XX:VMOptionsFile option
3064 for (int j = 0; j < args_to_insert->nOptions; j++) {
3065 options.push(args_to_insert->options[j]);
3066 }
3067 } else {
3068 options.push(args->options[i]);
3069 }
3070 }
3071 // make into options array
3072 return set_args(&options);
3073 }
3074 };
3075
3076 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3077 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3078 }
3079
3080 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3081 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3082 }
3083
3084 jint Arguments::parse_options_environment_variable(const char* name,
3085 ScopedVMInitArgs* vm_args) {
3086 char *buffer = ::getenv(name);
3087
3088 // Don't check this environment variable if user has special privileges
3089 // (e.g. unix su command).
3090 if (buffer == nullptr || os::have_special_privileges()) {
3091 return JNI_OK;
3092 }
3093
3094 if ((buffer = os::strdup(buffer)) == nullptr) {
3095 return JNI_ENOMEM;
3096 }
3097
3098 jio_fprintf(defaultStream::error_stream(),
3099 "Picked up %s: %s\n", name, buffer);
3100
3101 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3102
3103 os::free(buffer);
3104 return retcode;
3105 }
3106
3107 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3108 // read file into buffer
3109 int fd = ::open(file_name, O_RDONLY);
3110 if (fd < 0) {
3111 jio_fprintf(defaultStream::error_stream(),
3112 "Could not open options file '%s'\n",
3113 file_name);
3114 return JNI_ERR;
3115 }
3116
3117 struct stat stbuf;
3118 int retcode = os::stat(file_name, &stbuf);
3119 if (retcode != 0) {
3120 jio_fprintf(defaultStream::error_stream(),
3121 "Could not stat options file '%s'\n",
3122 file_name);
3123 ::close(fd);
3124 return JNI_ERR;
3125 }
3126
3127 if (stbuf.st_size == 0) {
3128 // tell caller there is no option data and that is ok
3129 ::close(fd);
3130 return JNI_OK;
3131 }
3132
3133 // '+ 1' for null termination even with max bytes
3134 size_t bytes_alloc = stbuf.st_size + 1;
3135
3136 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3137 if (nullptr == buf) {
3138 jio_fprintf(defaultStream::error_stream(),
3139 "Could not allocate read buffer for options file parse\n");
3140 ::close(fd);
3141 return JNI_ENOMEM;
3142 }
3143
3144 memset(buf, 0, bytes_alloc);
3145
3146 // Fill buffer
3147 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3148 ::close(fd);
3149 if (bytes_read < 0) {
3150 FREE_C_HEAP_ARRAY(char, buf);
3151 jio_fprintf(defaultStream::error_stream(),
3152 "Could not read options file '%s'\n", file_name);
3153 return JNI_ERR;
3154 }
3155
3156 if (bytes_read == 0) {
3157 // tell caller there is no option data and that is ok
3158 FREE_C_HEAP_ARRAY(char, buf);
3159 return JNI_OK;
3160 }
3161
3162 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3163
3164 FREE_C_HEAP_ARRAY(char, buf);
3165 return retcode;
3166 }
3167
3168 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3169 // Construct option array
3170 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3171
3172 // some pointers to help with parsing
3173 char *buffer_end = buffer + buf_len;
3174 char *opt_hd = buffer;
3175 char *wrt = buffer;
3176 char *rd = buffer;
3177
3178 // parse all options
3179 while (rd < buffer_end) {
3180 // skip leading white space from the input string
3181 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3182 rd++;
3183 }
3184
3185 if (rd >= buffer_end) {
3186 break;
3187 }
3188
3189 // Remember this is where we found the head of the token.
3190 opt_hd = wrt;
3191
3192 // Tokens are strings of non white space characters separated
3193 // by one or more white spaces.
3194 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3195 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3196 int quote = *rd; // matching quote to look for
3197 rd++; // don't copy open quote
3198 while (rd < buffer_end && *rd != quote) {
3199 // include everything (even spaces)
3200 // up until the close quote
3201 *wrt++ = *rd++; // copy to option string
3202 }
3203
3204 if (rd < buffer_end) {
3205 rd++; // don't copy close quote
3206 } else {
3207 // did not see closing quote
3208 jio_fprintf(defaultStream::error_stream(),
3209 "Unmatched quote in %s\n", name);
3210 return JNI_ERR;
3211 }
3212 } else {
3213 *wrt++ = *rd++; // copy to option string
3214 }
3215 }
3216
3217 // steal a white space character and set it to null
3218 *wrt++ = '\0';
3219 // We now have a complete token
3220
3221 JavaVMOption option;
3222 option.optionString = opt_hd;
3223 option.extraInfo = nullptr;
3224
3225 options.append(option); // Fill in option
3226
3227 rd++; // Advance to next character
3228 }
3229
3230 // Fill out JavaVMInitArgs structure.
3231 return vm_args->set_args(&options);
3232 }
3233
3234 #ifndef PRODUCT
3235 // Determine whether LogVMOutput should be implicitly turned on.
3236 static bool use_vm_log() {
3237 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3238 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3239 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3240 PrintAssembly || TraceDeoptimization ||
3241 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3242 return true;
3243 }
3244
3245 #ifdef COMPILER1
3246 if (PrintC1Statistics) {
3247 return true;
3248 }
3249 #endif // COMPILER1
3250
3251 #ifdef COMPILER2
3252 if (PrintOptoAssembly || PrintOptoStatistics) {
3253 return true;
3254 }
3255 #endif // COMPILER2
3256
3257 return false;
3258 }
3259
3260 #endif // PRODUCT
3261
3262 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3263 for (int index = 0; index < args->nOptions; index++) {
3264 const JavaVMOption* option = args->options + index;
3265 const char* tail;
3266 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3267 return true;
3268 }
3269 }
3270 return false;
3271 }
3272
3273 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3274 const char* vm_options_file,
3275 const int vm_options_file_pos,
3276 ScopedVMInitArgs* vm_options_file_args,
3277 ScopedVMInitArgs* args_out) {
3278 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3279 if (code != JNI_OK) {
3280 return code;
3281 }
3282
3283 if (vm_options_file_args->get()->nOptions < 1) {
3284 return JNI_OK;
3285 }
3286
3287 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3288 jio_fprintf(defaultStream::error_stream(),
3289 "A VM options file may not refer to a VM options file. "
3290 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3291 "options file '%s' in options container '%s' is an error.\n",
3292 vm_options_file_args->vm_options_file_arg(),
3293 vm_options_file_args->container_name());
3294 return JNI_EINVAL;
3295 }
3296
3297 return args_out->insert(args, vm_options_file_args->get(),
3298 vm_options_file_pos);
3299 }
3300
3301 // Expand -XX:VMOptionsFile found in args_in as needed.
3302 // mod_args and args_out parameters may return values as needed.
3303 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3304 ScopedVMInitArgs* mod_args,
3305 JavaVMInitArgs** args_out) {
3306 jint code = match_special_option_and_act(args_in, mod_args);
3307 if (code != JNI_OK) {
3308 return code;
3309 }
3310
3311 if (mod_args->is_set()) {
3312 // args_in contains -XX:VMOptionsFile and mod_args contains the
3313 // original options from args_in along with the options expanded
3314 // from the VMOptionsFile. Return a short-hand to the caller.
3315 *args_out = mod_args->get();
3316 } else {
3317 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3318 }
3319 return JNI_OK;
3320 }
3321
3322 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3323 ScopedVMInitArgs* args_out) {
3324 // Remaining part of option string
3325 const char* tail;
3326 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3327
3328 for (int index = 0; index < args->nOptions; index++) {
3329 const JavaVMOption* option = args->options + index;
3330 if (match_option(option, "-XX:Flags=", &tail)) {
3331 Arguments::set_jvm_flags_file(tail);
3332 continue;
3333 }
3334 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3335 if (vm_options_file_args.found_vm_options_file_arg()) {
3336 jio_fprintf(defaultStream::error_stream(),
3337 "The option '%s' is already specified in the options "
3338 "container '%s' so the specification of '%s' in the "
3339 "same options container is an error.\n",
3340 vm_options_file_args.vm_options_file_arg(),
3341 vm_options_file_args.container_name(),
3342 option->optionString);
3343 return JNI_EINVAL;
3344 }
3345 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3346 // If there's a VMOptionsFile, parse that
3347 jint code = insert_vm_options_file(args, tail, index,
3348 &vm_options_file_args, args_out);
3349 if (code != JNI_OK) {
3350 return code;
3351 }
3352 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3353 if (args_out->is_set()) {
3354 // The VMOptions file inserted some options so switch 'args'
3355 // to the new set of options, and continue processing which
3356 // preserves "last option wins" semantics.
3357 args = args_out->get();
3358 // The first option from the VMOptionsFile replaces the
3359 // current option. So we back track to process the
3360 // replacement option.
3361 index--;
3362 }
3363 continue;
3364 }
3365 if (match_option(option, "-XX:+PrintVMOptions")) {
3366 PrintVMOptions = true;
3367 continue;
3368 }
3369 if (match_option(option, "-XX:-PrintVMOptions")) {
3370 PrintVMOptions = false;
3371 continue;
3372 }
3373 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3374 IgnoreUnrecognizedVMOptions = true;
3375 continue;
3376 }
3377 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3378 IgnoreUnrecognizedVMOptions = false;
3379 continue;
3380 }
3381 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3382 JVMFlag::printFlags(tty, false);
3383 vm_exit(0);
3384 }
3385
3386 #ifndef PRODUCT
3387 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3388 JVMFlag::printFlags(tty, true);
3389 vm_exit(0);
3390 }
3391 #endif
3392 }
3393 return JNI_OK;
3394 }
3395
3396 static void print_options(const JavaVMInitArgs *args) {
3397 const char* tail;
3398 for (int index = 0; index < args->nOptions; index++) {
3399 const JavaVMOption *option = args->options + index;
3400 if (match_option(option, "-XX:", &tail)) {
3401 logOption(tail);
3402 }
3403 }
3404 }
3405
3406 bool Arguments::handle_deprecated_print_gc_flags() {
3407 if (PrintGC) {
3408 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3409 }
3410 if (PrintGCDetails) {
3411 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3412 }
3413
3414 if (_legacyGCLogging.lastFlag == 2) {
3415 // -Xloggc was used to specify a filename
3416 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3417
3418 LogTarget(Error, logging) target;
3419 LogStream errstream(target);
3420 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3421 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3422 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3423 }
3424 return true;
3425 }
3426
3427 static void apply_debugger_ergo() {
3428 #ifdef ASSERT
3429 if (ReplayCompiles) {
3430 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3431 }
3432
3433 if (UseDebuggerErgo) {
3434 // Turn on sub-flags
3435 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3436 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3437 }
3438
3439 if (UseDebuggerErgo2) {
3440 // Debugging with limited number of CPUs
3441 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3442 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3443 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3444 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3445 }
3446 #endif // ASSERT
3447 }
3448
3449 // Parse entry point called from JNI_CreateJavaVM
3450
3451 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3452 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3453 JVMFlag::check_all_flag_declarations();
3454
3455 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3456 const char* hotspotrc = ".hotspotrc";
3457 bool settings_file_specified = false;
3458 bool needs_hotspotrc_warning = false;
3459 ScopedVMInitArgs initial_vm_options_args("");
3460 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3461 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3462
3463 // Pointers to current working set of containers
3464 JavaVMInitArgs* cur_cmd_args;
3465 JavaVMInitArgs* cur_vm_options_args;
3466 JavaVMInitArgs* cur_java_options_args;
3467 JavaVMInitArgs* cur_java_tool_options_args;
3468
3469 // Containers for modified/expanded options
3470 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3471 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3472 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3473 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3474
3475
3476 jint code =
3477 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3478 if (code != JNI_OK) {
3479 return code;
3480 }
3481
3482 code = parse_java_options_environment_variable(&initial_java_options_args);
3483 if (code != JNI_OK) {
3484 return code;
3485 }
3486
3487 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3488 char *vmoptions = ClassLoader::lookup_vm_options();
3489 if (vmoptions != nullptr) {
3490 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3491 FREE_C_HEAP_ARRAY(char, vmoptions);
3492 if (code != JNI_OK) {
3493 return code;
3494 }
3495 }
3496
3497 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3498 &mod_java_tool_options_args,
3499 &cur_java_tool_options_args);
3500 if (code != JNI_OK) {
3501 return code;
3502 }
3503
3504 code = expand_vm_options_as_needed(initial_cmd_args,
3505 &mod_cmd_args,
3506 &cur_cmd_args);
3507 if (code != JNI_OK) {
3508 return code;
3509 }
3510
3511 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3512 &mod_java_options_args,
3513 &cur_java_options_args);
3514 if (code != JNI_OK) {
3515 return code;
3516 }
3517
3518 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3519 &mod_vm_options_args,
3520 &cur_vm_options_args);
3521 if (code != JNI_OK) {
3522 return code;
3523 }
3524
3525 const char* flags_file = Arguments::get_jvm_flags_file();
3526 settings_file_specified = (flags_file != nullptr);
3527
3528 if (IgnoreUnrecognizedVMOptions) {
3529 cur_cmd_args->ignoreUnrecognized = true;
3530 cur_java_tool_options_args->ignoreUnrecognized = true;
3531 cur_java_options_args->ignoreUnrecognized = true;
3532 }
3533
3534 // Parse specified settings file
3535 if (settings_file_specified) {
3536 if (!process_settings_file(flags_file, true,
3537 cur_cmd_args->ignoreUnrecognized)) {
3538 return JNI_EINVAL;
3539 }
3540 } else {
3541 #ifdef ASSERT
3542 // Parse default .hotspotrc settings file
3543 if (!process_settings_file(".hotspotrc", false,
3544 cur_cmd_args->ignoreUnrecognized)) {
3545 return JNI_EINVAL;
3546 }
3547 #else
3548 struct stat buf;
3549 if (os::stat(hotspotrc, &buf) == 0) {
3550 needs_hotspotrc_warning = true;
3551 }
3552 #endif
3553 }
3554
3555 if (PrintVMOptions) {
3556 print_options(cur_java_tool_options_args);
3557 print_options(cur_cmd_args);
3558 print_options(cur_java_options_args);
3559 }
3560
3561 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3562 jint result = parse_vm_init_args(cur_vm_options_args,
3563 cur_java_tool_options_args,
3564 cur_java_options_args,
3565 cur_cmd_args);
3566
3567 if (result != JNI_OK) {
3568 return result;
3569 }
3570
3571 // Delay warning until here so that we've had a chance to process
3572 // the -XX:-PrintWarnings flag
3573 if (needs_hotspotrc_warning) {
3574 warning("%s file is present but has been ignored. "
3575 "Run with -XX:Flags=%s to load the file.",
3576 hotspotrc, hotspotrc);
3577 }
3578
3579 if (needs_module_property_warning) {
3580 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3581 " names that are reserved for internal use.");
3582 }
3583
3584 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3585 UNSUPPORTED_OPTION(UseLargePages);
3586 #endif
3587
3588 #if defined(AIX)
3589 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3590 #endif
3591
3592 #ifndef PRODUCT
3593 if (TraceBytecodesAt != 0) {
3594 TraceBytecodes = true;
3595 }
3596 #endif // PRODUCT
3597
3598 if (ScavengeRootsInCode == 0) {
3599 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3600 warning("Forcing ScavengeRootsInCode non-zero");
3601 }
3602 ScavengeRootsInCode = 1;
3603 }
3604
3605 if (!handle_deprecated_print_gc_flags()) {
3606 return JNI_EINVAL;
3607 }
3608
3609 // Set object alignment values.
3610 set_object_alignment();
3611
3612 #if !INCLUDE_CDS
3613 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3614 jio_fprintf(defaultStream::error_stream(),
3615 "Shared spaces are not supported in this VM\n");
3616 return JNI_ERR;
3617 }
3618 if (DumpLoadedClassList != nullptr) {
3619 jio_fprintf(defaultStream::error_stream(),
3620 "DumpLoadedClassList is not supported in this VM\n");
3621 return JNI_ERR;
3622 }
3623 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3624 log_is_enabled(Info, cds)) {
3625 warning("Shared spaces are not supported in this VM");
3626 UseSharedSpaces = false;
3627 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3628 }
3629 no_shared_spaces("CDS Disabled");
3630 #endif // INCLUDE_CDS
3631
3632 // Verify NMT arguments
3633 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3634 if (lvl == NMT_unknown) {
3635 jio_fprintf(defaultStream::error_stream(),
3636 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3637 return JNI_ERR;
3638 }
3639 if (PrintNMTStatistics && lvl == NMT_off) {
3640 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3641 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3642 }
3643
3644 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3645 if (trace_dependencies && VerifyDependencies) {
3646 warning("dependency logging results may be inflated by VerifyDependencies");
3647 }
3648
3649 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3650 log_is_enabled(Info, class, load, cause);
3651 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3652 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3653 }
3654
3655 apply_debugger_ergo();
3656
3657 // The VMThread needs to stop now and then to execute these debug options.
3658 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3659 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3660 }
3661
3662 if (log_is_enabled(Info, arguments)) {
3663 LogStream st(Log(arguments)::info());
3664 Arguments::print_on(&st);
3665 }
3666
3667 return JNI_OK;
3668 }
3669
3670 void Arguments::set_compact_headers_flags() {
3671 #ifdef _LP64
3672 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3673 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3674 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3675 }
3676 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3677 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3678 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3679 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3680
3681 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3682 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3683 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3684 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3685 } else {
3686 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3687 }
3688 }
3689 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3690 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3691 }
3692 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3693 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3694 }
3695 #endif
3696 }
3697
3698 jint Arguments::apply_ergo() {
3699 // Set flags based on ergonomics.
3700 jint result = set_ergonomics_flags();
3701 if (result != JNI_OK) return result;
3702
3703 // Set heap size based on available physical memory
3704 set_heap_size();
3705
3706 GCConfig::arguments()->initialize();
3707
3708 set_compact_headers_flags();
3709
3710 if (UseCompressedClassPointers) {
3711 CompressedKlassPointers::pre_initialize();
3712 }
3713
3714 CDSConfig::initialize();
3715
3716 // Initialize Metaspace flags and alignments
3717 Metaspace::ergo_initialize();
3718
3719 if (!StringDedup::ergo_initialize()) {
3720 return JNI_EINVAL;
3721 }
3722
3723 // Set compiler flags after GC is selected and GC specific
3724 // flags (LoopStripMiningIter) are set.
3725 CompilerConfig::ergo_initialize();
3726
3727 // Set bytecode rewriting flags
3728 set_bytecode_flags();
3729
3730 // Set flags if aggressive optimization flags are enabled
3731 jint code = set_aggressive_opts_flags();
3732 if (code != JNI_OK) {
3733 return code;
3734 }
3735
3736 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3737 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3738 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3739 warning("UseSecondarySupersTable is not supported");
3740 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3741 }
3742 UseSecondarySupersTable = false; // FIXME: Disabled for Leyden. Neet to fix SCAddressTable::id_for_address()
3743 if (!UseSecondarySupersTable) {
3744 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3745 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3746 }
3747
3748 #ifdef ZERO
3749 // Clear flags not supported on zero.
3750 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3751 #endif // ZERO
3752
3753 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3754 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3755 DebugNonSafepoints = true;
3756 }
3757
3758 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3759 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3760 }
3761
3762 // Treat the odd case where local verification is enabled but remote
3763 // verification is not as if both were enabled.
3764 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3765 log_info(verification)("Turning on remote verification because local verification is on");
3766 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3767 }
3768
3769 #ifndef PRODUCT
3770 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3771 if (use_vm_log()) {
3772 LogVMOutput = true;
3773 }
3774 }
3775 #endif // PRODUCT
3776
3777 if (PrintCommandLineFlags) {
3778 JVMFlag::printSetFlags(tty);
3779 }
3780
3781 #if COMPILER2_OR_JVMCI
3782 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3783 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3784 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3785 }
3786 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3787
3788 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3789 if (!EnableVectorReboxing) {
3790 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3791 } else {
3792 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3793 }
3794 }
3795 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3796
3797 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3798 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3799 }
3800 FLAG_SET_DEFAULT(UseVectorStubs, false);
3801 }
3802 #endif // COMPILER2_OR_JVMCI
3803
3804 if (log_is_enabled(Info, init)) {
3805 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3806 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3807 }
3808 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3809 // automatically enable -Xlog:perf+class+link
3810 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3811 }
3812 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3813 } else {
3814 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3815 warning("Disabling ProfileVMLocks since logging is turned off.");
3816 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3817 }
3818 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3819 warning("Disabling ProfileVMCalls since logging is turned off.");
3820 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3821 }
3822 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3823 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3824 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3825 }
3826 if (log_is_enabled(Info, perf, class, link)) {
3827 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3828 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3829 }
3830 }
3831 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3832 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3833 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3834 }
3835 }
3836
3837 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3838 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3839 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3840 }
3841 }
3842 return JNI_OK;
3843 }
3844
3845 jint Arguments::adjust_after_os() {
3846 if (UseNUMA) {
3847 if (UseParallelGC) {
3848 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3849 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3850 }
3851 }
3852 }
3853 return JNI_OK;
3854 }
3855
3856 int Arguments::PropertyList_count(SystemProperty* pl) {
3857 int count = 0;
3858 while(pl != nullptr) {
3859 count++;
3860 pl = pl->next();
3861 }
3862 return count;
3863 }
3864
3865 // Return the number of readable properties.
3866 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3867 int count = 0;
3868 while(pl != nullptr) {
3869 if (pl->readable()) {
3870 count++;
3871 }
3872 pl = pl->next();
3873 }
3874 return count;
3875 }
3876
3877 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3878 assert(key != nullptr, "just checking");
3879 SystemProperty* prop;
3880 for (prop = pl; prop != nullptr; prop = prop->next()) {
3881 if (strcmp(key, prop->key()) == 0) return prop->value();
3882 }
3883 return nullptr;
3884 }
3885
3886 // Return the value of the requested property provided that it is a readable property.
3887 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3888 assert(key != nullptr, "just checking");
3889 SystemProperty* prop;
3890 // Return the property value if the keys match and the property is not internal or
3891 // it's the special internal property "jdk.boot.class.path.append".
3892 for (prop = pl; prop != nullptr; prop = prop->next()) {
3893 if (strcmp(key, prop->key()) == 0) {
3894 if (!prop->internal()) {
3895 return prop->value();
3896 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3897 return prop->value();
3898 } else {
3899 // Property is internal and not jdk.boot.class.path.append so return null.
3900 return nullptr;
3901 }
3902 }
3903 }
3904 return nullptr;
3905 }
3906
3907 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3908 SystemProperty* p = *plist;
3909 if (p == nullptr) {
3910 *plist = new_p;
3911 } else {
3912 while (p->next() != nullptr) {
3913 p = p->next();
3914 }
3915 p->set_next(new_p);
3916 }
3917 }
3918
3919 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3920 bool writeable, bool internal) {
3921 if (plist == nullptr)
3922 return;
3923
3924 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3925 PropertyList_add(plist, new_p);
3926 }
3927
3928 void Arguments::PropertyList_add(SystemProperty *element) {
3929 PropertyList_add(&_system_properties, element);
3930 }
3931
3932 // This add maintains unique property key in the list.
3933 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3934 PropertyAppendable append, PropertyWriteable writeable,
3935 PropertyInternal internal) {
3936 if (plist == nullptr)
3937 return;
3938
3939 // If property key exists and is writeable, then update with new value.
3940 // Trying to update a non-writeable property is silently ignored.
3941 SystemProperty* prop;
3942 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3943 if (strcmp(k, prop->key()) == 0) {
3944 if (append == AppendProperty) {
3945 prop->append_writeable_value(v);
3946 } else {
3947 prop->set_writeable_value(v);
3948 }
3949 return;
3950 }
3951 }
3952
3953 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3954 }
3955
3956 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3957 // Returns true if all of the source pointed by src has been copied over to
3958 // the destination buffer pointed by buf. Otherwise, returns false.
3959 // Notes:
3960 // 1. If the length (buflen) of the destination buffer excluding the
3961 // null terminator character is not long enough for holding the expanded
3962 // pid characters, it also returns false instead of returning the partially
3963 // expanded one.
3964 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3965 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3966 char* buf, size_t buflen) {
3967 const char* p = src;
3968 char* b = buf;
3969 const char* src_end = &src[srclen];
3970 char* buf_end = &buf[buflen - 1];
3971
3972 while (p < src_end && b < buf_end) {
3973 if (*p == '%') {
3974 switch (*(++p)) {
3975 case '%': // "%%" ==> "%"
3976 *b++ = *p++;
3977 break;
3978 case 'p': { // "%p" ==> current process id
3979 // buf_end points to the character before the last character so
3980 // that we could write '\0' to the end of the buffer.
3981 size_t buf_sz = buf_end - b + 1;
3982 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3983
3984 // if jio_snprintf fails or the buffer is not long enough to hold
3985 // the expanded pid, returns false.
3986 if (ret < 0 || ret >= (int)buf_sz) {
3987 return false;
3988 } else {
3989 b += ret;
3990 assert(*b == '\0', "fail in copy_expand_pid");
3991 if (p == src_end && b == buf_end + 1) {
3992 // reach the end of the buffer.
3993 return true;
3994 }
3995 }
3996 p++;
3997 break;
3998 }
3999 default :
4000 *b++ = '%';
4001 }
4002 } else {
4003 *b++ = *p++;
4004 }
4005 }
4006 *b = '\0';
4007 return (p == src_end); // return false if not all of the source was copied
4008 }