1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "cds/heapShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/javaAssertions.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "compiler/compilerDefinitions.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/genArguments.hpp"
39 #include "gc/shared/stringdedup/stringDedup.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logConfiguration.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "nmt/nmtCommon.hpp"
48 #include "oops/compressedKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiAgentList.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/flags/jvmFlag.hpp"
55 #include "runtime/flags/jvmFlagAccess.hpp"
56 #include "runtime/flags/jvmFlagLimit.hpp"
57 #include "runtime/globals_extension.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/os.hpp"
60 #include "runtime/safepoint.hpp"
61 #include "runtime/safepointMechanism.hpp"
62 #include "runtime/synchronizer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "services/management.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/checkedCast.hpp"
67 #include "utilities/debug.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/parseInteger.hpp"
71 #include "utilities/powerOfTwo.hpp"
72 #include "utilities/stringUtils.hpp"
73 #include "utilities/systemMemoryBarrier.hpp"
74 #if INCLUDE_JFR
75 #include "jfr/jfr.hpp"
76 #endif
77
78 #include <limits>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 char* Arguments::_java_command = nullptr;
90 SystemProperty* Arguments::_system_properties = nullptr;
91 size_t Arguments::_conservative_max_heap_alignment = 0;
92 Arguments::Mode Arguments::_mode = _mixed;
93 const char* Arguments::_java_vendor_url_bug = nullptr;
94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
95 bool Arguments::_sun_java_launcher_is_altjvm = false;
96
97 // These parameters are reset in method parse_vm_init_args()
98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
100 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
101 bool Arguments::_ClipInlining = ClipInlining;
102 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
103
104 bool Arguments::_enable_preview = 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 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
323 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
324 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
325 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
326 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
327 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
328 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
329 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
330 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
331 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
332 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
333 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
334 return true;
335 }
336 }
337 return false;
338 }
339
340 // Return true if the key matches the --module-path property name ("jdk.module.path").
341 bool Arguments::is_module_path_property(const char* key) {
342 return (strcmp(key, MODULE_PROPERTY_PREFIX PATH) == 0);
343 }
344
345 // Process java launcher properties.
346 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
347 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
348 // Must do this before setting up other system properties,
349 // as some of them may depend on launcher type.
350 for (int index = 0; index < args->nOptions; index++) {
351 const JavaVMOption* option = args->options + index;
352 const char* tail;
353
354 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
355 process_java_launcher_argument(tail, option->extraInfo);
356 continue;
357 }
358 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
359 if (strcmp(tail, "true") == 0) {
360 _sun_java_launcher_is_altjvm = true;
361 }
362 continue;
363 }
364 }
365 }
366
367 // Initialize system properties key and value.
368 void Arguments::init_system_properties() {
369
370 // Set up _boot_class_path which is not a property but
371 // relies heavily on argument processing and the jdk.boot.class.path.append
372 // property. It is used to store the underlying boot class path.
373 _boot_class_path = new PathString(nullptr);
374
375 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
376 "Java Virtual Machine Specification", false));
377 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
378 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
379 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
380
381 // Initialize the vm.info now, but it will need updating after argument parsing.
382 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
383
384 // Following are JVMTI agent writable properties.
385 // Properties values are set to nullptr and they are
386 // os specific they are initialized in os::init_system_properties_values().
387 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
388 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
389 _java_home = new SystemProperty("java.home", nullptr, true);
390 _java_class_path = new SystemProperty("java.class.path", "", true);
391 // jdk.boot.class.path.append is a non-writeable, internal property.
392 // It can only be set by either:
393 // - -Xbootclasspath/a:
394 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
395 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
396
397 // Add to System Property list.
398 PropertyList_add(&_system_properties, _sun_boot_library_path);
399 PropertyList_add(&_system_properties, _java_library_path);
400 PropertyList_add(&_system_properties, _java_home);
401 PropertyList_add(&_system_properties, _java_class_path);
402 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
403 PropertyList_add(&_system_properties, _vm_info);
404
405 // Set OS specific system properties values
406 os::init_system_properties_values();
407 }
408
409 // Update/Initialize System properties after JDK version number is known
410 void Arguments::init_version_specific_system_properties() {
411 enum { bufsz = 16 };
412 char buffer[bufsz];
413 const char* spec_vendor = "Oracle Corporation";
414 uint32_t spec_version = JDK_Version::current().major_version();
415
416 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
417
418 PropertyList_add(&_system_properties,
419 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
420 PropertyList_add(&_system_properties,
421 new SystemProperty("java.vm.specification.version", buffer, false));
422 PropertyList_add(&_system_properties,
423 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
424 }
425
426 /*
427 * -XX argument processing:
428 *
429 * -XX arguments are defined in several places, such as:
430 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
431 * -XX arguments are parsed in parse_argument().
432 * -XX argument bounds checking is done in check_vm_args_consistency().
433 *
434 * Over time -XX arguments may change. There are mechanisms to handle common cases:
435 *
436 * ALIASED: An option that is simply another name for another option. This is often
437 * part of the process of deprecating a flag, but not all aliases need
438 * to be deprecated.
439 *
440 * Create an alias for an option by adding the old and new option names to the
441 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
442 *
443 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
444 * support may be removed in the future. Both regular and aliased options may be
445 * deprecated.
446 *
447 * Add a deprecation warning for an option (or alias) by adding an entry in the
448 * "special_jvm_flags" table and setting the "deprecated_in" field.
449 * Often an option "deprecated" in one major release will
450 * be made "obsolete" in the next. In this case the entry should also have its
451 * "obsolete_in" field set.
452 *
453 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
454 * on the command line. A warning is printed to let the user know that option might not
455 * be accepted in the future.
456 *
457 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
458 * table and setting the "obsolete_in" field.
459 *
460 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
461 * to the current JDK version. The system will flatly refuse to admit the existence of
462 * the flag. This allows a flag to die automatically over JDK releases.
463 *
464 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
465 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
466 * - Newly obsolete or expired deprecated options should have their global variable
467 * definitions removed (from globals.hpp, etc) and related implementations removed.
468 *
469 * Recommended approach for removing options:
470 *
471 * To remove options commonly used by customers (e.g. product -XX options), use
472 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
473 *
474 * To remove internal options (e.g. diagnostic, experimental, develop options), use
475 * a 2-step model adding major release numbers to the obsolete and expire columns.
476 *
477 * To change the name of an option, use the alias table as well as a 2-step
478 * model adding major release numbers to the deprecate and expire columns.
479 * Think twice about aliasing commonly used customer options.
480 *
481 * There are times when it is appropriate to leave a future release number as undefined.
482 *
483 * Tests: Aliases should be tested in VMAliasOptions.java.
484 * Deprecated options should be tested in VMDeprecatedOptions.java.
485 */
486
487 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
488 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
489 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
490 // the command-line as usual, but will issue a warning.
491 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
492 // the command-line, while issuing a warning and ignoring the flag value.
493 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
494 // existence of the flag.
495 //
496 // MANUAL CLEANUP ON JDK VERSION UPDATES:
497 // This table ensures that the handling of options will update automatically when the JDK
498 // version is incremented, but the source code needs to be cleanup up manually:
499 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
500 // variable should be removed, as well as users of the variable.
501 // - As "deprecated" options age into "obsolete" options, move the entry into the
502 // "Obsolete Flags" section of the table.
503 // - All expired options should be removed from the table.
504 static SpecialFlag const special_jvm_flags[] = {
505 // -------------- Deprecated Flags --------------
506 // --- Non-alias flags - sorted by obsolete_in then expired_in:
507 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
508 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
509 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
511 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
512 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
513 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
514 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
515 #ifdef LINUX
516 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
517 #endif
518 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
519 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
520 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
521
522 // -------------- Obsolete Flags - sorted by expired_in --------------
523
524 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
525
526 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
527 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
528 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
529 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
530 #if defined(X86)
531 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
532 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
533 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
534 #endif // X86
535
536
537 { "BaseFootPrintEstimate", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
538 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
539 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
540 #ifdef ASSERT
541 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
542 #endif
543
544 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
545 // These entries will generate build errors. Their purpose is to test the macros.
546 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
547 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
548 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
549 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
550 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
552 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553 #endif
554
555 { nullptr, JDK_Version(0), JDK_Version(0) }
556 };
557
558 // Flags that are aliases for other flags.
559 typedef struct {
560 const char* alias_name;
561 const char* real_name;
562 } AliasedFlag;
563
564 static AliasedFlag const aliased_jvm_flags[] = {
565 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
566 { nullptr, nullptr}
567 };
568
569 // Return true if "v" is less than "other", where "other" may be "undefined".
570 static bool version_less_than(JDK_Version v, JDK_Version other) {
571 assert(!v.is_undefined(), "must be defined");
572 if (!other.is_undefined() && v.compare(other) >= 0) {
573 return false;
574 } else {
575 return true;
576 }
577 }
578
579 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
580 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
581 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
582 flag = special_jvm_flags[i];
583 return true;
584 }
585 }
586 return false;
587 }
588
589 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
590 assert(version != nullptr, "Must provide a version buffer");
591 SpecialFlag flag;
592 if (lookup_special_flag(flag_name, flag)) {
593 if (!flag.obsolete_in.is_undefined()) {
594 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
595 *version = flag.obsolete_in;
596 // This flag may have been marked for obsoletion in this version, but we may not
597 // have actually removed it yet. Rather than ignoring it as soon as we reach
598 // this version we allow some time for the removal to happen. So if the flag
599 // still actually exists we process it as normal, but issue an adjusted warning.
600 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
601 if (real_flag != nullptr) {
602 char version_str[256];
603 version->to_string(version_str, sizeof(version_str));
604 warning("Temporarily processing option %s; support is scheduled for removal in %s",
605 flag_name, version_str);
606 return false;
607 }
608 return true;
609 }
610 }
611 }
612 return false;
613 }
614
615 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
616 assert(version != nullptr, "Must provide a version buffer");
617 SpecialFlag flag;
618 if (lookup_special_flag(flag_name, flag)) {
619 if (!flag.deprecated_in.is_undefined()) {
620 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
621 version_less_than(JDK_Version::current(), flag.expired_in)) {
622 *version = flag.deprecated_in;
623 return 1;
624 } else {
625 return -1;
626 }
627 }
628 }
629 return 0;
630 }
631
632 const char* Arguments::real_flag_name(const char *flag_name) {
633 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
634 const AliasedFlag& flag_status = aliased_jvm_flags[i];
635 if (strcmp(flag_status.alias_name, flag_name) == 0) {
636 return flag_status.real_name;
637 }
638 }
639 return flag_name;
640 }
641
642 #ifdef ASSERT
643 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
644 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
645 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
646 return true;
647 }
648 }
649 return false;
650 }
651
652 // Verifies the correctness of the entries in the special_jvm_flags table.
653 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
654 // version being earlier than the deprecation version, then a warning is issued
655 // and verification fails - by returning false. If it is detected that the table
656 // is out of date, with respect to the current version, then ideally a warning is
657 // issued but verification does not fail. This allows the VM to operate when the
658 // version is first updated, without needing to update all the impacted flags at
659 // the same time. In practice we can't issue the warning immediately when the version
660 // is updated as it occurs for every test and some tests are not prepared to handle
661 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
662 // if the check_globals flag is true, and in addition allow a grace period and only
663 // check for stale flags when we hit build 25 (which is far enough into the 6 month
664 // release cycle that all flag updates should have been processed, whilst still
665 // leaving time to make the change before RDP2).
666 // We use a gtest to call this, passing true, so that we can detect stale flags before
667 // the end of the release cycle.
668
669 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
670
671 bool Arguments::verify_special_jvm_flags(bool check_globals) {
672 bool success = true;
673 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
674 const SpecialFlag& flag = special_jvm_flags[i];
675 if (lookup_special_flag(flag.name, i)) {
676 warning("Duplicate special flag declaration \"%s\"", flag.name);
677 success = false;
678 }
679 if (flag.deprecated_in.is_undefined() &&
680 flag.obsolete_in.is_undefined()) {
681 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
682 success = false;
683 }
684
685 if (!flag.deprecated_in.is_undefined()) {
686 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
687 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
688 success = false;
689 }
690
691 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
692 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
693 success = false;
694 }
695 }
696
697 if (!flag.obsolete_in.is_undefined()) {
698 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
699 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
700 success = false;
701 }
702
703 // if flag has become obsolete it should not have a "globals" flag defined anymore.
704 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
705 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
706 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
707 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
708 success = false;
709 }
710 }
711
712 } else if (!flag.expired_in.is_undefined()) {
713 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
714 success = false;
715 }
716
717 if (!flag.expired_in.is_undefined()) {
718 // if flag has become expired it should not have a "globals" flag defined anymore.
719 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
720 !version_less_than(JDK_Version::current(), flag.expired_in)) {
721 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
722 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
723 success = false;
724 }
725 }
726 }
727 }
728 return success;
729 }
730 #endif
731
732 bool Arguments::atojulong(const char *s, julong* result) {
733 return parse_integer(s, result);
734 }
735
736 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
737 if (size < min_size) return arg_too_small;
738 if (size > max_size) return arg_too_big;
739 return arg_in_range;
740 }
741
742 // Describe an argument out of range error
743 void Arguments::describe_range_error(ArgsRange errcode) {
744 switch(errcode) {
745 case arg_too_big:
746 jio_fprintf(defaultStream::error_stream(),
747 "The specified size exceeds the maximum "
748 "representable size.\n");
749 break;
750 case arg_too_small:
751 case arg_unreadable:
752 case arg_in_range:
753 // do nothing for now
754 break;
755 default:
756 ShouldNotReachHere();
757 }
758 }
759
760 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
761 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
762 return true;
763 } else {
764 return false;
765 }
766 }
767
768 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
769 // strtod allows leading whitespace, but our flag format does not.
770 if (*value == '\0' || isspace((unsigned char) *value)) {
771 return false;
772 }
773 char* end;
774 errno = 0;
775 double v = strtod(value, &end);
776 if ((errno != 0) || (*end != 0)) {
777 return false;
778 }
779 if (g_isnan(v) || !g_isfinite(v)) {
780 // Currently we cannot handle these special values.
781 return false;
782 }
783
784 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
785 return true;
786 }
787 return false;
788 }
789
790 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
791 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
792
793 if (flag->is_int()) {
794 int v;
795 if (parse_integer(value, &v)) {
796 result = JVMFlagAccess::set_int(flag, &v, origin);
797 }
798 } else if (flag->is_uint()) {
799 uint v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_uint(flag, &v, origin);
802 }
803 } else if (flag->is_intx()) {
804 intx v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_intx(flag, &v, origin);
807 }
808 } else if (flag->is_uintx()) {
809 uintx v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_uintx(flag, &v, origin);
812 }
813 } else if (flag->is_uint64_t()) {
814 uint64_t v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
817 }
818 } else if (flag->is_size_t()) {
819 size_t v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_size_t(flag, &v, origin);
822 }
823 }
824
825 return result == JVMFlag::SUCCESS;
826 }
827
828 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
829 if (value[0] == '\0') {
830 value = nullptr;
831 }
832 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
833 // Contract: JVMFlag always returns a pointer that needs freeing.
834 FREE_C_HEAP_ARRAY(char, value);
835 return true;
836 }
837
838 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
839 const char* old_value = "";
840 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
841 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
842 size_t new_len = strlen(new_value);
843 const char* value;
844 char* free_this_too = nullptr;
845 if (old_len == 0) {
846 value = new_value;
847 } else if (new_len == 0) {
848 value = old_value;
849 } else {
850 size_t length = old_len + 1 + new_len + 1;
851 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
852 // each new setting adds another LINE to the switch:
853 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
854 value = buf;
855 free_this_too = buf;
856 }
857 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
858 // JVMFlag always returns a pointer that needs freeing.
859 FREE_C_HEAP_ARRAY(char, value);
860 // JVMFlag made its own copy, so I must delete my own temp. buffer.
861 FREE_C_HEAP_ARRAY(char, free_this_too);
862 return true;
863 }
864
865 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
866 const char* real_name = real_flag_name(arg);
867 JDK_Version since = JDK_Version();
868 switch (is_deprecated_flag(arg, &since)) {
869 case -1: {
870 // Obsolete or expired, so don't process normally,
871 // but allow for an obsolete flag we're still
872 // temporarily allowing.
873 if (!is_obsolete_flag(arg, &since)) {
874 return real_name;
875 }
876 // Note if we're not considered obsolete then we can't be expired either
877 // as obsoletion must come first.
878 return nullptr;
879 }
880 case 0:
881 return real_name;
882 case 1: {
883 char version[256];
884 since.to_string(version, sizeof(version));
885 if (real_name != arg) {
886 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
887 arg, version, real_name);
888 } else {
889 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
890 arg, version);
891 }
892 return real_name;
893 }
894 }
895 ShouldNotReachHere();
896 return nullptr;
897 }
898
899 #define BUFLEN 255
900
901 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
902 char name_copied[BUFLEN+1];
903 if (name[name_length] != 0) {
904 if (name_length > BUFLEN) {
905 return nullptr;
906 } else {
907 strncpy(name_copied, name, name_length);
908 name_copied[name_length] = '\0';
909 name = name_copied;
910 }
911 }
912
913 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
914 if (real_name == nullptr) {
915 return nullptr;
916 }
917 JVMFlag* flag = JVMFlag::find_flag(real_name);
918 return flag;
919 }
920
921 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
922 bool is_bool = false;
923 bool bool_val = false;
924 char c = *arg;
925 if (c == '+' || c == '-') {
926 is_bool = true;
927 bool_val = (c == '+');
928 arg++;
929 }
930
931 const char* name = arg;
932 while (true) {
933 c = *arg;
934 if (isalnum(c) || (c == '_')) {
935 ++arg;
936 } else {
937 break;
938 }
939 }
940
941 size_t name_len = size_t(arg - name);
942 if (name_len == 0) {
943 return false;
944 }
945
946 JVMFlag* flag = find_jvm_flag(name, name_len);
947 if (flag == nullptr) {
948 return false;
949 }
950
951 if (is_bool) {
952 if (*arg != 0) {
953 // Error -- extra characters such as -XX:+BoolFlag=123
954 return false;
955 }
956 return set_bool_flag(flag, bool_val, origin);
957 }
958
959 if (arg[0] == '=') {
960 const char* value = arg + 1;
961 if (flag->is_ccstr()) {
962 if (flag->ccstr_accumulates()) {
963 return append_to_string_flag(flag, value, origin);
964 } else {
965 return set_string_flag(flag, value, origin);
966 }
967 } else if (flag->is_double()) {
968 return set_fp_numeric_flag(flag, value, origin);
969 } else {
970 return set_numeric_flag(flag, value, origin);
971 }
972 }
973
974 if (arg[0] == ':' && arg[1] == '=') {
975 // -XX:Foo:=xxx will reset the string flag to the given value.
976 const char* value = arg + 2;
977 return set_string_flag(flag, value, origin);
978 }
979
980 return false;
981 }
982
983 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
984 assert(bldarray != nullptr, "illegal argument");
985
986 if (arg == nullptr) {
987 return;
988 }
989
990 int new_count = *count + 1;
991
992 // expand the array and add arg to the last element
993 if (*bldarray == nullptr) {
994 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
995 } else {
996 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
997 }
998 (*bldarray)[*count] = os::strdup_check_oom(arg);
999 *count = new_count;
1000 }
1001
1002 void Arguments::build_jvm_args(const char* arg) {
1003 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1004 }
1005
1006 void Arguments::build_jvm_flags(const char* arg) {
1007 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1008 }
1009
1010 // utility function to return a string that concatenates all
1011 // strings in a given char** array
1012 const char* Arguments::build_resource_string(char** args, int count) {
1013 if (args == nullptr || count == 0) {
1014 return nullptr;
1015 }
1016 size_t length = 0;
1017 for (int i = 0; i < count; i++) {
1018 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1019 }
1020 char* s = NEW_RESOURCE_ARRAY(char, length);
1021 char* dst = s;
1022 for (int j = 0; j < count; j++) {
1023 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1024 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1025 dst += offset;
1026 length -= offset;
1027 }
1028 return (const char*) s;
1029 }
1030
1031 void Arguments::print_on(outputStream* st) {
1032 st->print_cr("VM Arguments:");
1033 if (num_jvm_flags() > 0) {
1034 st->print("jvm_flags: "); print_jvm_flags_on(st);
1035 st->cr();
1036 }
1037 if (num_jvm_args() > 0) {
1038 st->print("jvm_args: "); print_jvm_args_on(st);
1039 st->cr();
1040 }
1041 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1042 if (_java_class_path != nullptr) {
1043 char* path = _java_class_path->value();
1044 size_t len = strlen(path);
1045 st->print("java_class_path (initial): ");
1046 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1047 if (len == 0) {
1048 st->print_raw_cr("<not set>");
1049 } else {
1050 st->print_raw_cr(path, len);
1051 }
1052 }
1053 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1054 }
1055
1056 void Arguments::print_summary_on(outputStream* st) {
1057 // Print the command line. Environment variables that are helpful for
1058 // reproducing the problem are written later in the hs_err file.
1059 // flags are from setting file
1060 if (num_jvm_flags() > 0) {
1061 st->print_raw("Settings File: ");
1062 print_jvm_flags_on(st);
1063 st->cr();
1064 }
1065 // args are the command line and environment variable arguments.
1066 st->print_raw("Command Line: ");
1067 if (num_jvm_args() > 0) {
1068 print_jvm_args_on(st);
1069 }
1070 // this is the classfile and any arguments to the java program
1071 if (java_command() != nullptr) {
1072 st->print("%s", java_command());
1073 }
1074 st->cr();
1075 }
1076
1077 void Arguments::print_jvm_flags_on(outputStream* st) {
1078 if (_num_jvm_flags > 0) {
1079 for (int i=0; i < _num_jvm_flags; i++) {
1080 st->print("%s ", _jvm_flags_array[i]);
1081 }
1082 }
1083 }
1084
1085 void Arguments::print_jvm_args_on(outputStream* st) {
1086 if (_num_jvm_args > 0) {
1087 for (int i=0; i < _num_jvm_args; i++) {
1088 st->print("%s ", _jvm_args_array[i]);
1089 }
1090 }
1091 }
1092
1093 bool Arguments::process_argument(const char* arg,
1094 jboolean ignore_unrecognized,
1095 JVMFlagOrigin origin) {
1096 JDK_Version since = JDK_Version();
1097
1098 if (parse_argument(arg, origin)) {
1099 return true;
1100 }
1101
1102 // Determine if the flag has '+', '-', or '=' characters.
1103 bool has_plus_minus = (*arg == '+' || *arg == '-');
1104 const char* const argname = has_plus_minus ? arg + 1 : arg;
1105
1106 size_t arg_len;
1107 const char* equal_sign = strchr(argname, '=');
1108 if (equal_sign == nullptr) {
1109 arg_len = strlen(argname);
1110 } else {
1111 arg_len = equal_sign - argname;
1112 }
1113
1114 // Only make the obsolete check for valid arguments.
1115 if (arg_len <= BUFLEN) {
1116 // Construct a string which consists only of the argument name without '+', '-', or '='.
1117 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1118 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1119 if (is_obsolete_flag(stripped_argname, &since)) {
1120 char version[256];
1121 since.to_string(version, sizeof(version));
1122 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1123 return true;
1124 }
1125 }
1126
1127 // For locked flags, report a custom error message if available.
1128 // Otherwise, report the standard unrecognized VM option.
1129 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1130 if (found_flag != nullptr) {
1131 char locked_message_buf[BUFLEN];
1132 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1133 if (strlen(locked_message_buf) != 0) {
1134 #ifdef PRODUCT
1135 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1136 if (ignore_unrecognized && mismatched) {
1137 return true;
1138 }
1139 #endif
1140 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1141 }
1142 if (found_flag->is_bool() && !has_plus_minus) {
1143 jio_fprintf(defaultStream::error_stream(),
1144 "Missing +/- setting for VM option '%s'\n", argname);
1145 } else if (!found_flag->is_bool() && has_plus_minus) {
1146 jio_fprintf(defaultStream::error_stream(),
1147 "Unexpected +/- setting in VM option '%s'\n", argname);
1148 } else {
1149 jio_fprintf(defaultStream::error_stream(),
1150 "Improperly specified VM option '%s'\n", argname);
1151 }
1152 } else {
1153 if (ignore_unrecognized) {
1154 return true;
1155 }
1156 jio_fprintf(defaultStream::error_stream(),
1157 "Unrecognized VM option '%s'\n", argname);
1158 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1159 if (fuzzy_matched != nullptr) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Did you mean '%s%s%s'?\n",
1162 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1163 fuzzy_matched->name(),
1164 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1165 }
1166 }
1167
1168 // allow for commandline "commenting out" options like -XX:#+Verbose
1169 return arg[0] == '#';
1170 }
1171
1172 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1173 FILE* stream = os::fopen(file_name, "rb");
1174 if (stream == nullptr) {
1175 if (should_exist) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Could not open settings file %s\n", file_name);
1178 return false;
1179 } else {
1180 return true;
1181 }
1182 }
1183
1184 char token[1024];
1185 int pos = 0;
1186
1187 bool in_white_space = true;
1188 bool in_comment = false;
1189 bool in_quote = false;
1190 int quote_c = 0;
1191 bool result = true;
1192
1193 int c = getc(stream);
1194 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1195 if (in_white_space) {
1196 if (in_comment) {
1197 if (c == '\n') in_comment = false;
1198 } else {
1199 if (c == '#') in_comment = true;
1200 else if (!isspace((unsigned char) c)) {
1201 in_white_space = false;
1202 token[pos++] = checked_cast<char>(c);
1203 }
1204 }
1205 } else {
1206 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1207 // token ends at newline, or at unquoted whitespace
1208 // this allows a way to include spaces in string-valued options
1209 token[pos] = '\0';
1210 logOption(token);
1211 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1212 build_jvm_flags(token);
1213 pos = 0;
1214 in_white_space = true;
1215 in_quote = false;
1216 } else if (!in_quote && (c == '\'' || c == '"')) {
1217 in_quote = true;
1218 quote_c = c;
1219 } else if (in_quote && (c == quote_c)) {
1220 in_quote = false;
1221 } else {
1222 token[pos++] = checked_cast<char>(c);
1223 }
1224 }
1225 c = getc(stream);
1226 }
1227 if (pos > 0) {
1228 token[pos] = '\0';
1229 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1230 build_jvm_flags(token);
1231 }
1232 fclose(stream);
1233 return result;
1234 }
1235
1236 //=============================================================================================================
1237 // Parsing of properties (-D)
1238
1239 const char* Arguments::get_property(const char* key) {
1240 return PropertyList_get_value(system_properties(), key);
1241 }
1242
1243 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1244 const char* eq = strchr(prop, '=');
1245 const char* key;
1246 const char* value = "";
1247
1248 if (eq == nullptr) {
1249 // property doesn't have a value, thus use passed string
1250 key = prop;
1251 } else {
1252 // property have a value, thus extract it and save to the
1253 // allocated string
1254 size_t key_len = eq - prop;
1255 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1256
1257 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1258 key = tmp_key;
1259
1260 value = &prop[key_len + 1];
1261 }
1262
1263 if (internal == ExternalProperty) {
1264 CDSConfig::check_incompatible_property(key, value);
1265 }
1266
1267 if (strcmp(key, "java.compiler") == 0) {
1268 // we no longer support java.compiler system property, log a warning and let it get
1269 // passed to Java, like any other system property
1270 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1271 // for applications using NONE or empty value, log a more informative message
1272 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1273 } else {
1274 warning("The java.compiler system property is obsolete and no longer supported.");
1275 }
1276 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1277 // sun.java.launcher.is_altjvm property is
1278 // private and is processed in process_sun_java_launcher_properties();
1279 // the sun.java.launcher property is passed on to the java application
1280 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1281 // append is true, writable is true, internal is false
1282 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1283 WriteableProperty, ExternalProperty);
1284 } else {
1285 if (strcmp(key, "sun.java.command") == 0) {
1286 char *old_java_command = _java_command;
1287 _java_command = os::strdup_check_oom(value, mtArguments);
1288 if (old_java_command != nullptr) {
1289 os::free(old_java_command);
1290 }
1291 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1292 // If this property is set on the command line then its value will be
1293 // displayed in VM error logs as the URL at which to submit such logs.
1294 // Normally the URL displayed in error logs is different from the value
1295 // of this system property, so a different property should have been
1296 // used here, but we leave this as-is in case someone depends upon it.
1297 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1298 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1299 // its value without going through the property list or making a Java call.
1300 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1301 if (old_java_vendor_url_bug != nullptr) {
1302 os::free((void *)old_java_vendor_url_bug);
1303 }
1304 }
1305
1306 // Create new property and add at the end of the list
1307 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1308 }
1309
1310 if (key != prop) {
1311 // SystemProperty copy passed value, thus free previously allocated
1312 // memory
1313 FreeHeap((void *)key);
1314 }
1315
1316 return true;
1317 }
1318
1319 //===========================================================================================================
1320 // Setting int/mixed/comp mode flags
1321
1322 void Arguments::set_mode_flags(Mode mode) {
1323 // Set up default values for all flags.
1324 // If you add a flag to any of the branches below,
1325 // add a default value for it here.
1326 _mode = mode;
1327
1328 // Ensure Agent_OnLoad has the correct initial values.
1329 // This may not be the final mode; mode may change later in onload phase.
1330 PropertyList_unique_add(&_system_properties, "java.vm.info",
1331 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1332
1333 UseInterpreter = true;
1334 UseCompiler = true;
1335 UseLoopCounter = true;
1336
1337 // Default values may be platform/compiler dependent -
1338 // use the saved values
1339 ClipInlining = Arguments::_ClipInlining;
1340 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1341 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1342 BackgroundCompilation = Arguments::_BackgroundCompilation;
1343
1344 // Change from defaults based on mode
1345 switch (mode) {
1346 default:
1347 ShouldNotReachHere();
1348 break;
1349 case _int:
1350 UseCompiler = false;
1351 UseLoopCounter = false;
1352 AlwaysCompileLoopMethods = false;
1353 UseOnStackReplacement = false;
1354 break;
1355 case _mixed:
1356 // same as default
1357 break;
1358 case _comp:
1359 UseInterpreter = false;
1360 BackgroundCompilation = false;
1361 ClipInlining = false;
1362 break;
1363 }
1364 }
1365
1366 // Conflict: required to use shared spaces (-Xshare:on), but
1367 // incompatible command line options were chosen.
1368 void Arguments::no_shared_spaces(const char* message) {
1369 if (RequireSharedSpaces) {
1370 jio_fprintf(defaultStream::error_stream(),
1371 "Class data sharing is inconsistent with other specified options.\n");
1372 vm_exit_during_initialization("Unable to use shared archive", message);
1373 } else {
1374 log_info(cds)("Unable to use shared archive: %s", message);
1375 UseSharedSpaces = false;
1376 }
1377 }
1378
1379 static void set_object_alignment() {
1380 // Object alignment.
1381 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1382 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1383 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1384 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1385 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1386 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1387
1388 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1389 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1390
1391 // Oop encoding heap max
1392 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1393 }
1394
1395 size_t Arguments::max_heap_for_compressed_oops() {
1396 // Avoid sign flip.
1397 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1398 // We need to fit both the null page and the heap into the memory budget, while
1399 // keeping alignment constraints of the heap. To guarantee the latter, as the
1400 // null page is located before the heap, we pad the null page to the conservative
1401 // maximum alignment that the GC may ever impose upon the heap.
1402 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1403 _conservative_max_heap_alignment);
1404
1405 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1406 NOT_LP64(ShouldNotReachHere(); return 0);
1407 }
1408
1409 void Arguments::set_use_compressed_oops() {
1410 #ifdef _LP64
1411 // MaxHeapSize is not set up properly at this point, but
1412 // the only value that can override MaxHeapSize if we are
1413 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1414 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1415
1416 if (max_heap_size <= max_heap_for_compressed_oops()) {
1417 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1418 FLAG_SET_ERGO(UseCompressedOops, true);
1419 }
1420 } else {
1421 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1422 warning("Max heap size too large for Compressed Oops");
1423 FLAG_SET_DEFAULT(UseCompressedOops, false);
1424 }
1425 }
1426 #endif // _LP64
1427 }
1428
1429 void Arguments::set_use_compressed_klass_ptrs() {
1430 #ifdef _LP64
1431 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1432 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1433 #endif // _LP64
1434 }
1435
1436 void Arguments::set_conservative_max_heap_alignment() {
1437 // The conservative maximum required alignment for the heap is the maximum of
1438 // the alignments imposed by several sources: any requirements from the heap
1439 // itself and the maximum page size we may run the VM with.
1440 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1441 _conservative_max_heap_alignment = MAX4(heap_alignment,
1442 os::vm_allocation_granularity(),
1443 os::max_page_size(),
1444 GCArguments::compute_heap_alignment());
1445 }
1446
1447 jint Arguments::set_ergonomics_flags() {
1448 GCConfig::initialize();
1449
1450 set_conservative_max_heap_alignment();
1451
1452 #ifdef _LP64
1453 set_use_compressed_oops();
1454 set_use_compressed_klass_ptrs();
1455
1456 // Also checks that certain machines are slower with compressed oops
1457 // in vm_version initialization code.
1458 #endif // _LP64
1459
1460 return JNI_OK;
1461 }
1462
1463 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1464 size_t max_allocatable;
1465 size_t result = limit;
1466 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1467 // The AggressiveHeap check is a temporary workaround to avoid calling
1468 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1469 // selected. This works because AggressiveHeap implies UseParallelGC
1470 // where we know the ratio will be 1. Once the AggressiveHeap option is
1471 // removed, this can be cleaned up.
1472 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1473 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1474 result = MIN2(result, max_allocatable / fraction);
1475 }
1476 return result;
1477 }
1478
1479 // Use static initialization to get the default before parsing
1480 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1481
1482 void Arguments::set_heap_size() {
1483 julong phys_mem;
1484
1485 // If the user specified one of these options, they
1486 // want specific memory sizing so do not limit memory
1487 // based on compressed oops addressability.
1488 // Also, memory limits will be calculated based on
1489 // available os physical memory, not our MaxRAM limit,
1490 // unless MaxRAM is also specified.
1491 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1492 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1493 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1494 !FLAG_IS_DEFAULT(MaxRAM));
1495 if (override_coop_limit) {
1496 if (FLAG_IS_DEFAULT(MaxRAM)) {
1497 phys_mem = os::physical_memory();
1498 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1499 } else {
1500 phys_mem = (julong)MaxRAM;
1501 }
1502 } else {
1503 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1504 : (julong)MaxRAM;
1505 }
1506
1507 // If the maximum heap size has not been set with -Xmx,
1508 // then set it as fraction of the size of physical memory,
1509 // respecting the maximum and minimum sizes of the heap.
1510 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1511 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1512 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1513 if (reasonable_min < MaxHeapSize) {
1514 // Small physical memory, so use a minimum fraction of it for the heap
1515 reasonable_max = reasonable_min;
1516 } else {
1517 // Not-small physical memory, so require a heap at least
1518 // as large as MaxHeapSize
1519 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1520 }
1521
1522 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1523 // Limit the heap size to ErgoHeapSizeLimit
1524 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1525 }
1526
1527 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1528
1529 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1530 // An initial heap size was specified on the command line,
1531 // so be sure that the maximum size is consistent. Done
1532 // after call to limit_heap_by_allocatable_memory because that
1533 // method might reduce the allocation size.
1534 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1535 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1536 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1537 }
1538
1539 #ifdef _LP64
1540 if (UseCompressedOops || UseCompressedClassPointers) {
1541 // HeapBaseMinAddress can be greater than default but not less than.
1542 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1543 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1544 // matches compressed oops printing flags
1545 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1546 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1547 DefaultHeapBaseMinAddress,
1548 DefaultHeapBaseMinAddress/G,
1549 HeapBaseMinAddress);
1550 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1551 }
1552 }
1553 }
1554 if (UseCompressedOops) {
1555 // Limit the heap size to the maximum possible when using compressed oops
1556 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1557
1558 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1559 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1560 // but it should be not less than default MaxHeapSize.
1561 max_coop_heap -= HeapBaseMinAddress;
1562 }
1563
1564 // If user specified flags prioritizing os physical
1565 // memory limits, then disable compressed oops if
1566 // limits exceed max_coop_heap and UseCompressedOops
1567 // was not specified.
1568 if (reasonable_max > max_coop_heap) {
1569 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1570 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1571 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1572 "Please check the setting of MaxRAMPercentage %5.2f."
1573 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1574 FLAG_SET_ERGO(UseCompressedOops, false);
1575 } else {
1576 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1577 }
1578 }
1579 }
1580 #endif // _LP64
1581
1582 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1583 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1584 }
1585
1586 // If the minimum or initial heap_size have not been set or requested to be set
1587 // ergonomically, set them accordingly.
1588 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1589 julong reasonable_minimum = (julong)(OldSize + NewSize);
1590
1591 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1592
1593 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1594
1595 if (InitialHeapSize == 0) {
1596 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1597 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1598
1599 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1600 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1601
1602 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1603 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1604 }
1605 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1606 // synchronize with InitialHeapSize to avoid errors with the default value.
1607 if (MinHeapSize == 0) {
1608 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1609 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1610 }
1611 }
1612 }
1613
1614 // This option inspects the machine and attempts to set various
1615 // parameters to be optimal for long-running, memory allocation
1616 // intensive jobs. It is intended for machines with large
1617 // amounts of cpu and memory.
1618 jint Arguments::set_aggressive_heap_flags() {
1619 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1620 // VM, but we may not be able to represent the total physical memory
1621 // available (like having 8gb of memory on a box but using a 32bit VM).
1622 // Thus, we need to make sure we're using a julong for intermediate
1623 // calculations.
1624 julong initHeapSize;
1625 julong total_memory = os::physical_memory();
1626
1627 if (total_memory < (julong) 256 * M) {
1628 jio_fprintf(defaultStream::error_stream(),
1629 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1630 vm_exit(1);
1631 }
1632
1633 // The heap size is half of available memory, or (at most)
1634 // all of possible memory less 160mb (leaving room for the OS
1635 // when using ISM). This is the maximum; because adaptive sizing
1636 // is turned on below, the actual space used may be smaller.
1637
1638 initHeapSize = MIN2(total_memory / (julong) 2,
1639 total_memory - (julong) 160 * M);
1640
1641 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1642
1643 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1644 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1645 return JNI_EINVAL;
1646 }
1647 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1648 return JNI_EINVAL;
1649 }
1650 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1651 return JNI_EINVAL;
1652 }
1653 }
1654 if (FLAG_IS_DEFAULT(NewSize)) {
1655 // Make the young generation 3/8ths of the total heap.
1656 if (FLAG_SET_CMDLINE(NewSize,
1657 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1658 return JNI_EINVAL;
1659 }
1660 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1661 return JNI_EINVAL;
1662 }
1663 }
1664
1665 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1666 FLAG_SET_DEFAULT(UseLargePages, true);
1667 #endif
1668
1669 // Increase some data structure sizes for efficiency
1670 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1671 return JNI_EINVAL;
1672 }
1673 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1674 return JNI_EINVAL;
1675 }
1676
1677 // See the OldPLABSize comment below, but replace 'after promotion'
1678 // with 'after copying'. YoungPLABSize is the size of the survivor
1679 // space per-gc-thread buffers. The default is 4kw.
1680 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1681 return JNI_EINVAL;
1682 }
1683
1684 // OldPLABSize is the size of the buffers in the old gen that
1685 // UseParallelGC uses to promote live data that doesn't fit in the
1686 // survivor spaces. At any given time, there's one for each gc thread.
1687 // The default size is 1kw. These buffers are rarely used, since the
1688 // survivor spaces are usually big enough. For specjbb, however, there
1689 // are occasions when there's lots of live data in the young gen
1690 // and we end up promoting some of it. We don't have a definite
1691 // explanation for why bumping OldPLABSize helps, but the theory
1692 // is that a bigger PLAB results in retaining something like the
1693 // original allocation order after promotion, which improves mutator
1694 // locality. A minor effect may be that larger PLABs reduce the
1695 // number of PLAB allocation events during gc. The value of 8kw
1696 // was arrived at by experimenting with specjbb.
1697 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1698 return JNI_EINVAL;
1699 }
1700
1701 // Enable parallel GC and adaptive generation sizing
1702 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1703 return JNI_EINVAL;
1704 }
1705
1706 // Encourage steady state memory management
1707 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1708 return JNI_EINVAL;
1709 }
1710
1711 return JNI_OK;
1712 }
1713
1714 // This must be called after ergonomics.
1715 void Arguments::set_bytecode_flags() {
1716 if (!RewriteBytecodes) {
1717 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1718 }
1719 }
1720
1721 // Aggressive optimization flags
1722 jint Arguments::set_aggressive_opts_flags() {
1723 #ifdef COMPILER2
1724 if (AggressiveUnboxing) {
1725 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1726 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1727 } else if (!EliminateAutoBox) {
1728 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1729 AggressiveUnboxing = false;
1730 }
1731 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1732 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1733 } else if (!DoEscapeAnalysis) {
1734 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1735 AggressiveUnboxing = false;
1736 }
1737 }
1738 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1739 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1740 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1741 }
1742 // Feed the cache size setting into the JDK
1743 char buffer[1024];
1744 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1745 if (!add_property(buffer)) {
1746 return JNI_ENOMEM;
1747 }
1748 }
1749 #endif
1750
1751 return JNI_OK;
1752 }
1753
1754 //===========================================================================================================
1755
1756 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1757 if (_sun_java_launcher != _default_java_launcher) {
1758 os::free(const_cast<char*>(_sun_java_launcher));
1759 }
1760 _sun_java_launcher = os::strdup_check_oom(launcher);
1761 }
1762
1763 bool Arguments::created_by_java_launcher() {
1764 assert(_sun_java_launcher != nullptr, "property must have value");
1765 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1766 }
1767
1768 bool Arguments::sun_java_launcher_is_altjvm() {
1769 return _sun_java_launcher_is_altjvm;
1770 }
1771
1772 //===========================================================================================================
1773 // Parsing of main arguments
1774
1775 unsigned int addreads_count = 0;
1776 unsigned int addexports_count = 0;
1777 unsigned int addopens_count = 0;
1778 unsigned int addmods_count = 0;
1779 unsigned int patch_mod_count = 0;
1780 unsigned int enable_native_access_count = 0;
1781
1782 // Check the consistency of vm_init_args
1783 bool Arguments::check_vm_args_consistency() {
1784 // Method for adding checks for flag consistency.
1785 // The intent is to warn the user of all possible conflicts,
1786 // before returning an error.
1787 // Note: Needs platform-dependent factoring.
1788 bool status = true;
1789
1790 if (TLABRefillWasteFraction == 0) {
1791 jio_fprintf(defaultStream::error_stream(),
1792 "TLABRefillWasteFraction should be a denominator, "
1793 "not " SIZE_FORMAT "\n",
1794 TLABRefillWasteFraction);
1795 status = false;
1796 }
1797
1798 status = CompilerConfig::check_args_consistency(status);
1799 #if INCLUDE_JVMCI
1800 if (status && EnableJVMCI) {
1801 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1802 AddProperty, UnwriteableProperty, InternalProperty);
1803 /*
1804 * Ioi - 2023/05/19. There's no need for this with my patch-jdk.sh script, which adds
1805 * jdk.internal.vm.ci as one of the default modules. Using -Djdk.module.addmods will
1806 * cause the full module graph to be disabled and slow down performance.
1807 */
1808 if (!TempDisableAddJVMCIModule && ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1809 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1810 return false;
1811 }
1812 }
1813 }
1814 #endif
1815
1816 #if INCLUDE_JFR
1817 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1818 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1819 return false;
1820 }
1821 }
1822 #endif
1823
1824 #ifndef SUPPORT_RESERVED_STACK_AREA
1825 if (StackReservedPages != 0) {
1826 FLAG_SET_CMDLINE(StackReservedPages, 0);
1827 warning("Reserved Stack Area not supported on this platform");
1828 }
1829 #endif
1830
1831 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1832 // ObjectMonitorTable requires lightweight locking.
1833 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1834 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1835 }
1836
1837 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1838 if (LockingMode == LM_MONITOR) {
1839 jio_fprintf(defaultStream::error_stream(),
1840 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1841 return false;
1842 }
1843 #endif
1844 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1845 jio_fprintf(defaultStream::error_stream(),
1846 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1847 return false;
1848 }
1849 return status;
1850 }
1851
1852 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1853 const char* option_type) {
1854 if (ignore) return false;
1855
1856 const char* spacer = " ";
1857 if (option_type == nullptr) {
1858 option_type = ++spacer; // Set both to the empty string.
1859 }
1860
1861 jio_fprintf(defaultStream::error_stream(),
1862 "Unrecognized %s%soption: %s\n", option_type, spacer,
1863 option->optionString);
1864 return true;
1865 }
1866
1867 static const char* user_assertion_options[] = {
1868 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1869 };
1870
1871 static const char* system_assertion_options[] = {
1872 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1873 };
1874
1875 bool Arguments::parse_uint(const char* value,
1876 uint* uint_arg,
1877 uint min_size) {
1878 uint n;
1879 if (!parse_integer(value, &n)) {
1880 return false;
1881 }
1882 if (n >= min_size) {
1883 *uint_arg = n;
1884 return true;
1885 } else {
1886 return false;
1887 }
1888 }
1889
1890 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1891 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1892 CDSConfig::check_internal_module_property(prop_name, prop_value);
1893 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1894 char* property = AllocateHeap(prop_len, mtArguments);
1895 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1896 if (ret < 0 || ret >= (int)prop_len) {
1897 FreeHeap(property);
1898 return false;
1899 }
1900 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1901 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1902 // that multiple occurrences of the associated flag just causes the existing property value to be
1903 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1904 // to a property after we have finished flag processing.
1905 bool added = add_property(property, WriteableProperty, internal);
1906 FreeHeap(property);
1907 return added;
1908 }
1909
1910 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1911 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1912 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1913 const unsigned int props_count_limit = 1000;
1914 const int max_digits = 3;
1915 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1916
1917 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1918 if (count < props_count_limit) {
1919 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1920 char* property = AllocateHeap(prop_len, mtArguments);
1921 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1922 if (ret < 0 || ret >= (int)prop_len) {
1923 FreeHeap(property);
1924 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1925 return false;
1926 }
1927 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1928 FreeHeap(property);
1929 return added;
1930 }
1931
1932 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1933 return false;
1934 }
1935
1936 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1937 julong* long_arg,
1938 julong min_size,
1939 julong max_size) {
1940 if (!parse_integer(s, long_arg)) return arg_unreadable;
1941 return check_memory_size(*long_arg, min_size, max_size);
1942 }
1943
1944 // Parse JavaVMInitArgs structure
1945
1946 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1947 const JavaVMInitArgs *java_tool_options_args,
1948 const JavaVMInitArgs *java_options_args,
1949 const JavaVMInitArgs *cmd_line_args) {
1950 bool patch_mod_javabase = false;
1951
1952 // Save default settings for some mode flags
1953 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1954 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1955 Arguments::_ClipInlining = ClipInlining;
1956 Arguments::_BackgroundCompilation = BackgroundCompilation;
1957
1958 // Remember the default value of SharedBaseAddress.
1959 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1960
1961 // Setup flags for mixed which is the default
1962 set_mode_flags(_mixed);
1963
1964 // Parse args structure generated from java.base vm options resource
1965 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1966 if (result != JNI_OK) {
1967 return result;
1968 }
1969
1970 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1971 // variable (if present).
1972 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1973 if (result != JNI_OK) {
1974 return result;
1975 }
1976
1977 // Parse args structure generated from the command line flags.
1978 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1979 if (result != JNI_OK) {
1980 return result;
1981 }
1982
1983 // Parse args structure generated from the _JAVA_OPTIONS environment
1984 // variable (if present) (mimics classic VM)
1985 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1986 if (result != JNI_OK) {
1987 return result;
1988 }
1989
1990 // Disable CDS for exploded image
1991 if (!has_jimage()) {
1992 no_shared_spaces("CDS disabled on exploded JDK");
1993 }
1994
1995 // We need to ensure processor and memory resources have been properly
1996 // configured - which may rely on arguments we just processed - before
1997 // doing the final argument processing. Any argument processing that
1998 // needs to know about processor and memory resources must occur after
1999 // this point.
2000
2001 os::init_container_support();
2002
2003 SystemMemoryBarrier::initialize();
2004
2005 // Do final processing now that all arguments have been parsed
2006 result = finalize_vm_init_args(patch_mod_javabase);
2007 if (result != JNI_OK) {
2008 return result;
2009 }
2010
2011 return JNI_OK;
2012 }
2013
2014 #if !INCLUDE_JVMTI
2015 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2016 // represents a valid JDWP agent. is_path==true denotes that we
2017 // are dealing with -agentpath (case where name is a path), otherwise with
2018 // -agentlib
2019 static bool valid_jdwp_agent(char *name, bool is_path) {
2020 char *_name;
2021 const char *_jdwp = "jdwp";
2022 size_t _len_jdwp, _len_prefix;
2023
2024 if (is_path) {
2025 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2026 return false;
2027 }
2028
2029 _name++; // skip past last path separator
2030 _len_prefix = strlen(JNI_LIB_PREFIX);
2031
2032 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2033 return false;
2034 }
2035
2036 _name += _len_prefix;
2037 _len_jdwp = strlen(_jdwp);
2038
2039 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2040 _name += _len_jdwp;
2041 }
2042 else {
2043 return false;
2044 }
2045
2046 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2047 return false;
2048 }
2049
2050 return true;
2051 }
2052
2053 if (strcmp(name, _jdwp) == 0) {
2054 return true;
2055 }
2056
2057 return false;
2058 }
2059 #endif
2060
2061 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2062 // --patch-module=<module>=<file>(<pathsep><file>)*
2063 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2064 // Find the equal sign between the module name and the path specification
2065 const char* module_equal = strchr(patch_mod_tail, '=');
2066 if (module_equal == nullptr) {
2067 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2068 return JNI_ERR;
2069 } else {
2070 // Pick out the module name
2071 size_t module_len = module_equal - patch_mod_tail;
2072 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2073 if (module_name != nullptr) {
2074 memcpy(module_name, patch_mod_tail, module_len);
2075 *(module_name + module_len) = '\0';
2076 // The path piece begins one past the module_equal sign
2077 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2078 FREE_C_HEAP_ARRAY(char, module_name);
2079 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2080 return JNI_ENOMEM;
2081 }
2082 } else {
2083 return JNI_ENOMEM;
2084 }
2085 }
2086 return JNI_OK;
2087 }
2088
2089 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2090 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2091 // The min and max sizes match the values in globals.hpp, but scaled
2092 // with K. The values have been chosen so that alignment with page
2093 // size doesn't change the max value, which makes the conversions
2094 // back and forth between Xss value and ThreadStackSize value easier.
2095 // The values have also been chosen to fit inside a 32-bit signed type.
2096 const julong min_ThreadStackSize = 0;
2097 const julong max_ThreadStackSize = 1 * M;
2098
2099 // Make sure the above values match the range set in globals.hpp
2100 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2101 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2102 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2103
2104 const julong min_size = min_ThreadStackSize * K;
2105 const julong max_size = max_ThreadStackSize * K;
2106
2107 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2108
2109 julong size = 0;
2110 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2111 if (errcode != arg_in_range) {
2112 bool silent = (option == nullptr); // Allow testing to silence error messages
2113 if (!silent) {
2114 jio_fprintf(defaultStream::error_stream(),
2115 "Invalid thread stack size: %s\n", option->optionString);
2116 describe_range_error(errcode);
2117 }
2118 return JNI_EINVAL;
2119 }
2120
2121 // Internally track ThreadStackSize in units of 1024 bytes.
2122 const julong size_aligned = align_up(size, K);
2123 assert(size <= size_aligned,
2124 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2125 size, size_aligned);
2126
2127 const julong size_in_K = size_aligned / K;
2128 assert(size_in_K < (julong)max_intx,
2129 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2130 size_in_K);
2131
2132 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2133 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2134 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2135 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2136 max_expanded, size_in_K);
2137
2138 *out_ThreadStackSize = (intx)size_in_K;
2139
2140 return JNI_OK;
2141 }
2142
2143 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2144 // For match_option to return remaining or value part of option string
2145 const char* tail;
2146
2147 // iterate over arguments
2148 for (int index = 0; index < args->nOptions; index++) {
2149 bool is_absolute_path = false; // for -agentpath vs -agentlib
2150
2151 const JavaVMOption* option = args->options + index;
2152
2153 if (!match_option(option, "-Djava.class.path", &tail) &&
2154 !match_option(option, "-Dsun.java.command", &tail) &&
2155 !match_option(option, "-Dsun.java.launcher", &tail)) {
2156
2157 // add all jvm options to the jvm_args string. This string
2158 // is used later to set the java.vm.args PerfData string constant.
2159 // the -Djava.class.path and the -Dsun.java.command options are
2160 // omitted from jvm_args string as each have their own PerfData
2161 // string constant object.
2162 build_jvm_args(option->optionString);
2163 }
2164
2165 // -verbose:[class/module/gc/jni]
2166 if (match_option(option, "-verbose", &tail)) {
2167 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2168 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2169 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2170 } else if (!strcmp(tail, ":module")) {
2171 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2172 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2173 } else if (!strcmp(tail, ":gc")) {
2174 if (_legacyGCLogging.lastFlag == 0) {
2175 _legacyGCLogging.lastFlag = 1;
2176 }
2177 } else if (!strcmp(tail, ":jni")) {
2178 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2179 }
2180 // -da / -ea / -disableassertions / -enableassertions
2181 // These accept an optional class/package name separated by a colon, e.g.,
2182 // -da:java.lang.Thread.
2183 } else if (match_option(option, user_assertion_options, &tail, true)) {
2184 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2185 if (*tail == '\0') {
2186 JavaAssertions::setUserClassDefault(enable);
2187 } else {
2188 assert(*tail == ':', "bogus match by match_option()");
2189 JavaAssertions::addOption(tail + 1, enable);
2190 }
2191 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2192 } else if (match_option(option, system_assertion_options, &tail, false)) {
2193 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2194 JavaAssertions::setSystemClassDefault(enable);
2195 // -bootclasspath:
2196 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2197 jio_fprintf(defaultStream::output_stream(),
2198 "-Xbootclasspath is no longer a supported option.\n");
2199 return JNI_EINVAL;
2200 // -bootclasspath/a:
2201 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2202 Arguments::append_sysclasspath(tail);
2203 // -bootclasspath/p:
2204 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2205 jio_fprintf(defaultStream::output_stream(),
2206 "-Xbootclasspath/p is no longer a supported option.\n");
2207 return JNI_EINVAL;
2208 // -Xrun
2209 } else if (match_option(option, "-Xrun", &tail)) {
2210 if (tail != nullptr) {
2211 const char* pos = strchr(tail, ':');
2212 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2213 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2214 jio_snprintf(name, len + 1, "%s", tail);
2215
2216 char *options = nullptr;
2217 if(pos != nullptr) {
2218 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2219 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2220 }
2221 #if !INCLUDE_JVMTI
2222 if (strcmp(name, "jdwp") == 0) {
2223 jio_fprintf(defaultStream::error_stream(),
2224 "Debugging agents are not supported in this VM\n");
2225 return JNI_ERR;
2226 }
2227 #endif // !INCLUDE_JVMTI
2228 JvmtiAgentList::add_xrun(name, options, false);
2229 FREE_C_HEAP_ARRAY(char, name);
2230 FREE_C_HEAP_ARRAY(char, options);
2231 }
2232 } else if (match_option(option, "--add-reads=", &tail)) {
2233 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2234 return JNI_ENOMEM;
2235 }
2236 } else if (match_option(option, "--add-exports=", &tail)) {
2237 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2238 return JNI_ENOMEM;
2239 }
2240 } else if (match_option(option, "--add-opens=", &tail)) {
2241 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2242 return JNI_ENOMEM;
2243 }
2244 } else if (match_option(option, "--add-modules=", &tail)) {
2245 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2246 return JNI_ENOMEM;
2247 }
2248 } else if (match_option(option, "--enable-native-access=", &tail)) {
2249 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2250 return JNI_ENOMEM;
2251 }
2252 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2253 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2254 return JNI_ENOMEM;
2255 }
2256 } else if (match_option(option, "--limit-modules=", &tail)) {
2257 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2258 return JNI_ENOMEM;
2259 }
2260 } else if (match_option(option, "--module-path=", &tail)) {
2261 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2262 return JNI_ENOMEM;
2263 }
2264 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2265 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2266 return JNI_ENOMEM;
2267 }
2268 } else if (match_option(option, "--patch-module=", &tail)) {
2269 // --patch-module=<module>=<file>(<pathsep><file>)*
2270 int res = process_patch_mod_option(tail, patch_mod_javabase);
2271 if (res != JNI_OK) {
2272 return res;
2273 }
2274 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2275 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2276 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2277 AddProperty, WriteableProperty, InternalProperty);
2278 } else {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2281 return JNI_ERR;
2282 }
2283 } else if (match_option(option, "--illegal-access=", &tail)) {
2284 char version[256];
2285 JDK_Version::jdk(17).to_string(version, sizeof(version));
2286 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2287 // -agentlib and -agentpath
2288 } else if (match_option(option, "-agentlib:", &tail) ||
2289 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2290 if(tail != nullptr) {
2291 const char* pos = strchr(tail, '=');
2292 char* name;
2293 if (pos == nullptr) {
2294 name = os::strdup_check_oom(tail, mtArguments);
2295 } else {
2296 size_t len = pos - tail;
2297 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2298 memcpy(name, tail, len);
2299 name[len] = '\0';
2300 }
2301
2302 char *options = nullptr;
2303 if(pos != nullptr) {
2304 options = os::strdup_check_oom(pos + 1, mtArguments);
2305 }
2306 #if !INCLUDE_JVMTI
2307 if (valid_jdwp_agent(name, is_absolute_path)) {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "Debugging agents are not supported in this VM\n");
2310 return JNI_ERR;
2311 }
2312 #endif // !INCLUDE_JVMTI
2313 JvmtiAgentList::add(name, options, is_absolute_path);
2314 os::free(name);
2315 os::free(options);
2316 }
2317 // -javaagent
2318 } else if (match_option(option, "-javaagent:", &tail)) {
2319 #if !INCLUDE_JVMTI
2320 jio_fprintf(defaultStream::error_stream(),
2321 "Instrumentation agents are not supported in this VM\n");
2322 return JNI_ERR;
2323 #else
2324 if (tail != nullptr) {
2325 size_t length = strlen(tail) + 1;
2326 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2327 jio_snprintf(options, length, "%s", tail);
2328 JvmtiAgentList::add("instrument", options, false);
2329 FREE_C_HEAP_ARRAY(char, options);
2330
2331 // java agents need module java.instrument
2332 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2333 return JNI_ENOMEM;
2334 }
2335 }
2336 #endif // !INCLUDE_JVMTI
2337 // --enable_preview
2338 } else if (match_option(option, "--enable-preview")) {
2339 set_enable_preview();
2340 // -Xnoclassgc
2341 } else if (match_option(option, "-Xnoclassgc")) {
2342 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2343 return JNI_EINVAL;
2344 }
2345 // -Xbatch
2346 } else if (match_option(option, "-Xbatch")) {
2347 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2348 return JNI_EINVAL;
2349 }
2350 // -Xmn for compatibility with other JVM vendors
2351 } else if (match_option(option, "-Xmn", &tail)) {
2352 julong long_initial_young_size = 0;
2353 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2354 if (errcode != arg_in_range) {
2355 jio_fprintf(defaultStream::error_stream(),
2356 "Invalid initial young generation size: %s\n", option->optionString);
2357 describe_range_error(errcode);
2358 return JNI_EINVAL;
2359 }
2360 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2361 return JNI_EINVAL;
2362 }
2363 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2364 return JNI_EINVAL;
2365 }
2366 // -Xms
2367 } else if (match_option(option, "-Xms", &tail)) {
2368 julong size = 0;
2369 // an initial heap size of 0 means automatically determine
2370 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2371 if (errcode != arg_in_range) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Invalid initial heap size: %s\n", option->optionString);
2374 describe_range_error(errcode);
2375 return JNI_EINVAL;
2376 }
2377 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2381 return JNI_EINVAL;
2382 }
2383 // -Xmx
2384 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2385 julong long_max_heap_size = 0;
2386 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2387 if (errcode != arg_in_range) {
2388 jio_fprintf(defaultStream::error_stream(),
2389 "Invalid maximum heap size: %s\n", option->optionString);
2390 describe_range_error(errcode);
2391 return JNI_EINVAL;
2392 }
2393 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2394 return JNI_EINVAL;
2395 }
2396 // Xmaxf
2397 } else if (match_option(option, "-Xmaxf", &tail)) {
2398 char* err;
2399 int maxf = (int)(strtod(tail, &err) * 100);
2400 if (*err != '\0' || *tail == '\0') {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "Bad max heap free percentage size: %s\n",
2403 option->optionString);
2404 return JNI_EINVAL;
2405 } else {
2406 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2407 return JNI_EINVAL;
2408 }
2409 }
2410 // Xminf
2411 } else if (match_option(option, "-Xminf", &tail)) {
2412 char* err;
2413 int minf = (int)(strtod(tail, &err) * 100);
2414 if (*err != '\0' || *tail == '\0') {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Bad min heap free percentage size: %s\n",
2417 option->optionString);
2418 return JNI_EINVAL;
2419 } else {
2420 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 }
2424 // -Xss
2425 } else if (match_option(option, "-Xss", &tail)) {
2426 intx value = 0;
2427 jint err = parse_xss(option, tail, &value);
2428 if (err != JNI_OK) {
2429 return err;
2430 }
2431 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2432 return JNI_EINVAL;
2433 }
2434 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2435 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2436 julong long_ReservedCodeCacheSize = 0;
2437
2438 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2439 if (errcode != arg_in_range) {
2440 jio_fprintf(defaultStream::error_stream(),
2441 "Invalid maximum code cache size: %s.\n", option->optionString);
2442 return JNI_EINVAL;
2443 }
2444 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2445 return JNI_EINVAL;
2446 }
2447 // -green
2448 } else if (match_option(option, "-green")) {
2449 jio_fprintf(defaultStream::error_stream(),
2450 "Green threads support not available\n");
2451 return JNI_EINVAL;
2452 // -native
2453 } else if (match_option(option, "-native")) {
2454 // HotSpot always uses native threads, ignore silently for compatibility
2455 // -Xrs
2456 } else if (match_option(option, "-Xrs")) {
2457 // Classic/EVM option, new functionality
2458 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2459 return JNI_EINVAL;
2460 }
2461 // -Xprof
2462 } else if (match_option(option, "-Xprof")) {
2463 char version[256];
2464 // Obsolete in JDK 10
2465 JDK_Version::jdk(10).to_string(version, sizeof(version));
2466 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2467 // -Xinternalversion
2468 } else if (match_option(option, "-Xinternalversion")) {
2469 jio_fprintf(defaultStream::output_stream(), "%s\n",
2470 VM_Version::internal_vm_info_string());
2471 vm_exit(0);
2472 #ifndef PRODUCT
2473 // -Xprintflags
2474 } else if (match_option(option, "-Xprintflags")) {
2475 JVMFlag::printFlags(tty, false);
2476 vm_exit(0);
2477 #endif
2478 // -D
2479 } else if (match_option(option, "-D", &tail)) {
2480 const char* value;
2481 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2482 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2483 // abort if -Djava.endorsed.dirs is set
2484 jio_fprintf(defaultStream::output_stream(),
2485 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2486 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2487 return JNI_EINVAL;
2488 }
2489 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2490 *value != '\0' && strcmp(value, "\"\"") != 0) {
2491 // abort if -Djava.ext.dirs is set
2492 jio_fprintf(defaultStream::output_stream(),
2493 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2494 return JNI_EINVAL;
2495 }
2496 // Check for module related properties. They must be set using the modules
2497 // options. For example: use "--add-modules=java.sql", not
2498 // "-Djdk.module.addmods=java.sql"
2499 if (is_internal_module_property(option->optionString + 2)) {
2500 needs_module_property_warning = true;
2501 continue;
2502 }
2503 if (!add_property(tail)) {
2504 return JNI_ENOMEM;
2505 }
2506 // Out of the box management support
2507 if (match_option(option, "-Dcom.sun.management", &tail)) {
2508 #if INCLUDE_MANAGEMENT
2509 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2510 return JNI_EINVAL;
2511 }
2512 // management agent in module jdk.management.agent
2513 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2514 return JNI_ENOMEM;
2515 }
2516 #else
2517 jio_fprintf(defaultStream::output_stream(),
2518 "-Dcom.sun.management is not supported in this VM.\n");
2519 return JNI_ERR;
2520 #endif
2521 }
2522 // -Xint
2523 } else if (match_option(option, "-Xint")) {
2524 set_mode_flags(_int);
2525 mode_flag_cmd_line = true;
2526 // -Xmixed
2527 } else if (match_option(option, "-Xmixed")) {
2528 set_mode_flags(_mixed);
2529 mode_flag_cmd_line = true;
2530 // -Xcomp
2531 } else if (match_option(option, "-Xcomp")) {
2532 // for testing the compiler; turn off all flags that inhibit compilation
2533 set_mode_flags(_comp);
2534 mode_flag_cmd_line = true;
2535 // -Xshare:dump
2536 } else if (match_option(option, "-Xshare:dump")) {
2537 CDSConfig::enable_dumping_static_archive();
2538 CDSConfig::set_old_cds_flags_used();
2539 // -Xshare:on
2540 } else if (match_option(option, "-Xshare:on")) {
2541 UseSharedSpaces = true;
2542 RequireSharedSpaces = true;
2543 CDSConfig::set_old_cds_flags_used();
2544 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2545 } else if (match_option(option, "-Xshare:auto")) {
2546 UseSharedSpaces = true;
2547 RequireSharedSpaces = false;
2548 xshare_auto_cmd_line = true;
2549 CDSConfig::set_old_cds_flags_used();
2550 // -Xshare:off
2551 } else if (match_option(option, "-Xshare:off")) {
2552 UseSharedSpaces = false;
2553 RequireSharedSpaces = false;
2554 CDSConfig::set_old_cds_flags_used();
2555 // -Xverify
2556 } else if (match_option(option, "-Xverify", &tail)) {
2557 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2558 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2559 return JNI_EINVAL;
2560 }
2561 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2562 return JNI_EINVAL;
2563 }
2564 } else if (strcmp(tail, ":remote") == 0) {
2565 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2569 return JNI_EINVAL;
2570 }
2571 } else if (strcmp(tail, ":none") == 0) {
2572 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2573 return JNI_EINVAL;
2574 }
2575 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2576 return JNI_EINVAL;
2577 }
2578 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2579 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2580 return JNI_EINVAL;
2581 }
2582 // -Xdebug
2583 } else if (match_option(option, "-Xdebug")) {
2584 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2585 } else if (match_option(option, "-Xloggc:", &tail)) {
2586 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2587 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2588 _legacyGCLogging.lastFlag = 2;
2589 _legacyGCLogging.file = os::strdup_check_oom(tail);
2590 } else if (match_option(option, "-Xlog", &tail)) {
2591 bool ret = false;
2592 if (strcmp(tail, ":help") == 0) {
2593 fileStream stream(defaultStream::output_stream());
2594 LogConfiguration::print_command_line_help(&stream);
2595 vm_exit(0);
2596 } else if (strcmp(tail, ":disable") == 0) {
2597 LogConfiguration::disable_logging();
2598 ret = true;
2599 } else if (strcmp(tail, ":async") == 0) {
2600 LogConfiguration::set_async_mode(true);
2601 ret = true;
2602 } else if (*tail == '\0') {
2603 ret = LogConfiguration::parse_command_line_arguments();
2604 assert(ret, "-Xlog without arguments should never fail to parse");
2605 } else if (*tail == ':') {
2606 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2607 }
2608 if (ret == false) {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2611 tail);
2612 return JNI_EINVAL;
2613 }
2614 // JNI hooks
2615 } else if (match_option(option, "-Xcheck", &tail)) {
2616 if (!strcmp(tail, ":jni")) {
2617 #if !INCLUDE_JNI_CHECK
2618 warning("JNI CHECKING is not supported in this VM");
2619 #else
2620 CheckJNICalls = true;
2621 #endif // INCLUDE_JNI_CHECK
2622 } else if (is_bad_option(option, args->ignoreUnrecognized,
2623 "check")) {
2624 return JNI_EINVAL;
2625 }
2626 } else if (match_option(option, "vfprintf")) {
2627 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2628 } else if (match_option(option, "exit")) {
2629 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2630 } else if (match_option(option, "abort")) {
2631 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2632 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2633 // and the last option wins.
2634 } else if (match_option(option, "-XX:+NeverTenure")) {
2635 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2636 return JNI_EINVAL;
2637 }
2638 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2639 return JNI_EINVAL;
2640 }
2641 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2645 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2646 return JNI_EINVAL;
2647 }
2648 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2649 return JNI_EINVAL;
2650 }
2651 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2652 return JNI_EINVAL;
2653 }
2654 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2655 uint max_tenuring_thresh = 0;
2656 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2659 return JNI_EINVAL;
2660 }
2661
2662 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665
2666 if (MaxTenuringThreshold == 0) {
2667 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2668 return JNI_EINVAL;
2669 }
2670 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2671 return JNI_EINVAL;
2672 }
2673 } else {
2674 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2675 return JNI_EINVAL;
2676 }
2677 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2678 return JNI_EINVAL;
2679 }
2680 }
2681 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2682 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2689 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2696 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2697 return JNI_EINVAL;
2698 }
2699 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2700 return JNI_EINVAL;
2701 }
2702 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2703 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2704 return JNI_EINVAL;
2705 }
2706 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2707 return JNI_EINVAL;
2708 }
2709 } else if (match_option(option, "--finalization=", &tail)) {
2710 if (strcmp(tail, "enabled") == 0) {
2711 InstanceKlass::set_finalization_enabled(true);
2712 } else if (strcmp(tail, "disabled") == 0) {
2713 InstanceKlass::set_finalization_enabled(false);
2714 } else {
2715 jio_fprintf(defaultStream::error_stream(),
2716 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2717 tail);
2718 return JNI_EINVAL;
2719 }
2720 #if !defined(DTRACE_ENABLED)
2721 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "DTraceMethodProbes flag is not applicable for this configuration\n");
2724 return JNI_EINVAL;
2725 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "DTraceAllocProbes flag is not applicable for this configuration\n");
2728 return JNI_EINVAL;
2729 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2732 return JNI_EINVAL;
2733 #endif // !defined(DTRACE_ENABLED)
2734 #ifdef ASSERT
2735 } else if (match_option(option, "-XX:+FullGCALot")) {
2736 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 #endif
2740 #if !INCLUDE_MANAGEMENT
2741 } else if (match_option(option, "-XX:+ManagementServer")) {
2742 jio_fprintf(defaultStream::error_stream(),
2743 "ManagementServer is not supported in this VM.\n");
2744 return JNI_ERR;
2745 #endif // INCLUDE_MANAGEMENT
2746 #if INCLUDE_JVMCI
2747 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2748 if (EnableJVMCIProduct) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2751 return JNI_EINVAL;
2752 }
2753 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2754 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2755 if (use_graal_jit) {
2756 const char* jvmci_compiler = get_property("jvmci.Compiler");
2757 if (jvmci_compiler != nullptr) {
2758 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2761 return JNI_ERR;
2762 }
2763 } else if (!add_property("jvmci.Compiler=graal")) {
2764 return JNI_ENOMEM;
2765 }
2766 }
2767
2768 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2769 if (EnableJVMCIProduct) {
2770 continue;
2771 }
2772 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2773 // Allow this flag if it has been unlocked.
2774 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2775 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Unable to enable JVMCI in product mode\n");
2778 return JNI_ERR;
2779 }
2780 }
2781 // The flag was locked so process normally to report that error
2782 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2783 return JNI_EINVAL;
2784 }
2785 #endif // INCLUDE_JVMCI
2786 #if INCLUDE_JFR
2787 } else if (match_jfr_option(&option)) {
2788 return JNI_EINVAL;
2789 #endif
2790 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2791 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2792 // already been handled
2793 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2794 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2795 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2796 return JNI_EINVAL;
2797 }
2798 }
2799 // Unknown option
2800 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2801 return JNI_ERR;
2802 }
2803 }
2804
2805 // PrintSharedArchiveAndExit will turn on
2806 // -Xshare:on
2807 // -Xlog:class+path=info
2808 if (PrintSharedArchiveAndExit) {
2809 UseSharedSpaces = true;
2810 RequireSharedSpaces = true;
2811 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2812 }
2813
2814 fix_appclasspath();
2815
2816 return JNI_OK;
2817 }
2818
2819 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2820 // For java.base check for duplicate --patch-module options being specified on the command line.
2821 // This check is only required for java.base, all other duplicate module specifications
2822 // will be checked during module system initialization. The module system initialization
2823 // will throw an ExceptionInInitializerError if this situation occurs.
2824 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2825 if (*patch_mod_javabase) {
2826 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2827 } else {
2828 *patch_mod_javabase = true;
2829 }
2830 }
2831
2832 // Create GrowableArray lazily, only if --patch-module has been specified
2833 if (_patch_mod_prefix == nullptr) {
2834 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2835 }
2836
2837 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2838 }
2839
2840 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2841 //
2842 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2843 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2844 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2845 // path is treated as the current directory.
2846 //
2847 // This causes problems with CDS, which requires that all directories specified in the classpath
2848 // must be empty. In most cases, applications do NOT want to load classes from the current
2849 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2850 // scripts compatible with CDS.
2851 void Arguments::fix_appclasspath() {
2852 if (IgnoreEmptyClassPaths) {
2853 const char separator = *os::path_separator();
2854 const char* src = _java_class_path->value();
2855
2856 // skip over all the leading empty paths
2857 while (*src == separator) {
2858 src ++;
2859 }
2860
2861 char* copy = os::strdup_check_oom(src, mtArguments);
2862
2863 // trim all trailing empty paths
2864 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2865 *tail = '\0';
2866 }
2867
2868 char from[3] = {separator, separator, '\0'};
2869 char to [2] = {separator, '\0'};
2870 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2871 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2872 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2873 }
2874
2875 _java_class_path->set_writeable_value(copy);
2876 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2877 }
2878 }
2879
2880 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2881 // check if the default lib/endorsed directory exists; if so, error
2882 char path[JVM_MAXPATHLEN];
2883 const char* fileSep = os::file_separator();
2884 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2885
2886 DIR* dir = os::opendir(path);
2887 if (dir != nullptr) {
2888 jio_fprintf(defaultStream::output_stream(),
2889 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2890 "in modular form will be supported via the concept of upgradeable modules.\n");
2891 os::closedir(dir);
2892 return JNI_ERR;
2893 }
2894
2895 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2896 dir = os::opendir(path);
2897 if (dir != nullptr) {
2898 jio_fprintf(defaultStream::output_stream(),
2899 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2900 "Use -classpath instead.\n.");
2901 os::closedir(dir);
2902 return JNI_ERR;
2903 }
2904
2905 // This must be done after all arguments have been processed
2906 // and the container support has been initialized since AggressiveHeap
2907 // relies on the amount of total memory available.
2908 if (AggressiveHeap) {
2909 jint result = set_aggressive_heap_flags();
2910 if (result != JNI_OK) {
2911 return result;
2912 }
2913 }
2914
2915 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2916 // but like -Xint, leave compilation thresholds unaffected.
2917 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2918 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2919 set_mode_flags(_int);
2920 }
2921
2922 #ifdef ZERO
2923 // Zero always runs in interpreted mode
2924 set_mode_flags(_int);
2925 #endif
2926
2927 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2928 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2929 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2930 }
2931
2932 #if !COMPILER2_OR_JVMCI
2933 // Don't degrade server performance for footprint
2934 if (FLAG_IS_DEFAULT(UseLargePages) &&
2935 MaxHeapSize < LargePageHeapSizeThreshold) {
2936 // No need for large granularity pages w/small heaps.
2937 // Note that large pages are enabled/disabled for both the
2938 // Java heap and the code cache.
2939 FLAG_SET_DEFAULT(UseLargePages, false);
2940 }
2941
2942 UNSUPPORTED_OPTION(ProfileInterpreter);
2943 #endif
2944
2945 // Parse the CompilationMode flag
2946 if (!CompilationModeFlag::initialize()) {
2947 return JNI_ERR;
2948 }
2949
2950 if (!check_vm_args_consistency()) {
2951 return JNI_ERR;
2952 }
2953
2954 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line, xshare_auto_cmd_line)) {
2955 return JNI_ERR;
2956 }
2957
2958 if (StoreCachedCode) {
2959 FLAG_SET_ERGO_IF_DEFAULT(CachedCodeMaxSize, 512*M);
2960 }
2961
2962 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2963 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2964 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2965
2966 return JNI_OK;
2967 }
2968
2969 // Helper class for controlling the lifetime of JavaVMInitArgs
2970 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2971 // deleted on the destruction of the ScopedVMInitArgs object.
2972 class ScopedVMInitArgs : public StackObj {
2973 private:
2974 JavaVMInitArgs _args;
2975 char* _container_name;
2976 bool _is_set;
2977 char* _vm_options_file_arg;
2978
2979 public:
2980 ScopedVMInitArgs(const char *container_name) {
2981 _args.version = JNI_VERSION_1_2;
2982 _args.nOptions = 0;
2983 _args.options = nullptr;
2984 _args.ignoreUnrecognized = false;
2985 _container_name = (char *)container_name;
2986 _is_set = false;
2987 _vm_options_file_arg = nullptr;
2988 }
2989
2990 // Populates the JavaVMInitArgs object represented by this
2991 // ScopedVMInitArgs object with the arguments in options. The
2992 // allocated memory is deleted by the destructor. If this method
2993 // returns anything other than JNI_OK, then this object is in a
2994 // partially constructed state, and should be abandoned.
2995 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2996 _is_set = true;
2997 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2998 JavaVMOption, options->length(), mtArguments);
2999 if (options_arr == nullptr) {
3000 return JNI_ENOMEM;
3001 }
3002 _args.options = options_arr;
3003
3004 for (int i = 0; i < options->length(); i++) {
3005 options_arr[i] = options->at(i);
3006 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3007 if (options_arr[i].optionString == nullptr) {
3008 // Rely on the destructor to do cleanup.
3009 _args.nOptions = i;
3010 return JNI_ENOMEM;
3011 }
3012 }
3013
3014 _args.nOptions = options->length();
3015 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3016 return JNI_OK;
3017 }
3018
3019 JavaVMInitArgs* get() { return &_args; }
3020 char* container_name() { return _container_name; }
3021 bool is_set() { return _is_set; }
3022 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3023 char* vm_options_file_arg() { return _vm_options_file_arg; }
3024
3025 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3026 if (_vm_options_file_arg != nullptr) {
3027 os::free(_vm_options_file_arg);
3028 }
3029 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3030 }
3031
3032 ~ScopedVMInitArgs() {
3033 if (_vm_options_file_arg != nullptr) {
3034 os::free(_vm_options_file_arg);
3035 }
3036 if (_args.options == nullptr) return;
3037 for (int i = 0; i < _args.nOptions; i++) {
3038 os::free(_args.options[i].optionString);
3039 }
3040 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3041 }
3042
3043 // Insert options into this option list, to replace option at
3044 // vm_options_file_pos (-XX:VMOptionsFile)
3045 jint insert(const JavaVMInitArgs* args,
3046 const JavaVMInitArgs* args_to_insert,
3047 const int vm_options_file_pos) {
3048 assert(_args.options == nullptr, "shouldn't be set yet");
3049 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3050 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3051
3052 int length = args->nOptions + args_to_insert->nOptions - 1;
3053 // Construct new option array
3054 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3055 for (int i = 0; i < args->nOptions; i++) {
3056 if (i == vm_options_file_pos) {
3057 // insert the new options starting at the same place as the
3058 // -XX:VMOptionsFile option
3059 for (int j = 0; j < args_to_insert->nOptions; j++) {
3060 options.push(args_to_insert->options[j]);
3061 }
3062 } else {
3063 options.push(args->options[i]);
3064 }
3065 }
3066 // make into options array
3067 return set_args(&options);
3068 }
3069 };
3070
3071 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3072 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3073 }
3074
3075 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3076 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3077 }
3078
3079 jint Arguments::parse_options_environment_variable(const char* name,
3080 ScopedVMInitArgs* vm_args) {
3081 char *buffer = ::getenv(name);
3082
3083 // Don't check this environment variable if user has special privileges
3084 // (e.g. unix su command).
3085 if (buffer == nullptr || os::have_special_privileges()) {
3086 return JNI_OK;
3087 }
3088
3089 if ((buffer = os::strdup(buffer)) == nullptr) {
3090 return JNI_ENOMEM;
3091 }
3092
3093 jio_fprintf(defaultStream::error_stream(),
3094 "Picked up %s: %s\n", name, buffer);
3095
3096 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3097
3098 os::free(buffer);
3099 return retcode;
3100 }
3101
3102 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3103 // read file into buffer
3104 int fd = ::open(file_name, O_RDONLY);
3105 if (fd < 0) {
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Could not open options file '%s'\n",
3108 file_name);
3109 return JNI_ERR;
3110 }
3111
3112 struct stat stbuf;
3113 int retcode = os::stat(file_name, &stbuf);
3114 if (retcode != 0) {
3115 jio_fprintf(defaultStream::error_stream(),
3116 "Could not stat options file '%s'\n",
3117 file_name);
3118 ::close(fd);
3119 return JNI_ERR;
3120 }
3121
3122 if (stbuf.st_size == 0) {
3123 // tell caller there is no option data and that is ok
3124 ::close(fd);
3125 return JNI_OK;
3126 }
3127
3128 // '+ 1' for null termination even with max bytes
3129 size_t bytes_alloc = stbuf.st_size + 1;
3130
3131 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3132 if (nullptr == buf) {
3133 jio_fprintf(defaultStream::error_stream(),
3134 "Could not allocate read buffer for options file parse\n");
3135 ::close(fd);
3136 return JNI_ENOMEM;
3137 }
3138
3139 memset(buf, 0, bytes_alloc);
3140
3141 // Fill buffer
3142 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3143 ::close(fd);
3144 if (bytes_read < 0) {
3145 FREE_C_HEAP_ARRAY(char, buf);
3146 jio_fprintf(defaultStream::error_stream(),
3147 "Could not read options file '%s'\n", file_name);
3148 return JNI_ERR;
3149 }
3150
3151 if (bytes_read == 0) {
3152 // tell caller there is no option data and that is ok
3153 FREE_C_HEAP_ARRAY(char, buf);
3154 return JNI_OK;
3155 }
3156
3157 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3158
3159 FREE_C_HEAP_ARRAY(char, buf);
3160 return retcode;
3161 }
3162
3163 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3164 // Construct option array
3165 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3166
3167 // some pointers to help with parsing
3168 char *buffer_end = buffer + buf_len;
3169 char *opt_hd = buffer;
3170 char *wrt = buffer;
3171 char *rd = buffer;
3172
3173 // parse all options
3174 while (rd < buffer_end) {
3175 // skip leading white space from the input string
3176 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3177 rd++;
3178 }
3179
3180 if (rd >= buffer_end) {
3181 break;
3182 }
3183
3184 // Remember this is where we found the head of the token.
3185 opt_hd = wrt;
3186
3187 // Tokens are strings of non white space characters separated
3188 // by one or more white spaces.
3189 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3190 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3191 int quote = *rd; // matching quote to look for
3192 rd++; // don't copy open quote
3193 while (rd < buffer_end && *rd != quote) {
3194 // include everything (even spaces)
3195 // up until the close quote
3196 *wrt++ = *rd++; // copy to option string
3197 }
3198
3199 if (rd < buffer_end) {
3200 rd++; // don't copy close quote
3201 } else {
3202 // did not see closing quote
3203 jio_fprintf(defaultStream::error_stream(),
3204 "Unmatched quote in %s\n", name);
3205 return JNI_ERR;
3206 }
3207 } else {
3208 *wrt++ = *rd++; // copy to option string
3209 }
3210 }
3211
3212 // steal a white space character and set it to null
3213 *wrt++ = '\0';
3214 // We now have a complete token
3215
3216 JavaVMOption option;
3217 option.optionString = opt_hd;
3218 option.extraInfo = nullptr;
3219
3220 options.append(option); // Fill in option
3221
3222 rd++; // Advance to next character
3223 }
3224
3225 // Fill out JavaVMInitArgs structure.
3226 return vm_args->set_args(&options);
3227 }
3228
3229 #ifndef PRODUCT
3230 // Determine whether LogVMOutput should be implicitly turned on.
3231 static bool use_vm_log() {
3232 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3233 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3234 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3235 PrintAssembly || TraceDeoptimization ||
3236 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3237 return true;
3238 }
3239
3240 #ifdef COMPILER1
3241 if (PrintC1Statistics) {
3242 return true;
3243 }
3244 #endif // COMPILER1
3245
3246 #ifdef COMPILER2
3247 if (PrintOptoAssembly || PrintOptoStatistics) {
3248 return true;
3249 }
3250 #endif // COMPILER2
3251
3252 return false;
3253 }
3254
3255 #endif // PRODUCT
3256
3257 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3258 for (int index = 0; index < args->nOptions; index++) {
3259 const JavaVMOption* option = args->options + index;
3260 const char* tail;
3261 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3262 return true;
3263 }
3264 }
3265 return false;
3266 }
3267
3268 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3269 const char* vm_options_file,
3270 const int vm_options_file_pos,
3271 ScopedVMInitArgs* vm_options_file_args,
3272 ScopedVMInitArgs* args_out) {
3273 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3274 if (code != JNI_OK) {
3275 return code;
3276 }
3277
3278 if (vm_options_file_args->get()->nOptions < 1) {
3279 return JNI_OK;
3280 }
3281
3282 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3283 jio_fprintf(defaultStream::error_stream(),
3284 "A VM options file may not refer to a VM options file. "
3285 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3286 "options file '%s' in options container '%s' is an error.\n",
3287 vm_options_file_args->vm_options_file_arg(),
3288 vm_options_file_args->container_name());
3289 return JNI_EINVAL;
3290 }
3291
3292 return args_out->insert(args, vm_options_file_args->get(),
3293 vm_options_file_pos);
3294 }
3295
3296 // Expand -XX:VMOptionsFile found in args_in as needed.
3297 // mod_args and args_out parameters may return values as needed.
3298 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3299 ScopedVMInitArgs* mod_args,
3300 JavaVMInitArgs** args_out) {
3301 jint code = match_special_option_and_act(args_in, mod_args);
3302 if (code != JNI_OK) {
3303 return code;
3304 }
3305
3306 if (mod_args->is_set()) {
3307 // args_in contains -XX:VMOptionsFile and mod_args contains the
3308 // original options from args_in along with the options expanded
3309 // from the VMOptionsFile. Return a short-hand to the caller.
3310 *args_out = mod_args->get();
3311 } else {
3312 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3313 }
3314 return JNI_OK;
3315 }
3316
3317 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3318 ScopedVMInitArgs* args_out) {
3319 // Remaining part of option string
3320 const char* tail;
3321 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3322
3323 for (int index = 0; index < args->nOptions; index++) {
3324 const JavaVMOption* option = args->options + index;
3325 if (match_option(option, "-XX:Flags=", &tail)) {
3326 Arguments::set_jvm_flags_file(tail);
3327 continue;
3328 }
3329 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3330 if (vm_options_file_args.found_vm_options_file_arg()) {
3331 jio_fprintf(defaultStream::error_stream(),
3332 "The option '%s' is already specified in the options "
3333 "container '%s' so the specification of '%s' in the "
3334 "same options container is an error.\n",
3335 vm_options_file_args.vm_options_file_arg(),
3336 vm_options_file_args.container_name(),
3337 option->optionString);
3338 return JNI_EINVAL;
3339 }
3340 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3341 // If there's a VMOptionsFile, parse that
3342 jint code = insert_vm_options_file(args, tail, index,
3343 &vm_options_file_args, args_out);
3344 if (code != JNI_OK) {
3345 return code;
3346 }
3347 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3348 if (args_out->is_set()) {
3349 // The VMOptions file inserted some options so switch 'args'
3350 // to the new set of options, and continue processing which
3351 // preserves "last option wins" semantics.
3352 args = args_out->get();
3353 // The first option from the VMOptionsFile replaces the
3354 // current option. So we back track to process the
3355 // replacement option.
3356 index--;
3357 }
3358 continue;
3359 }
3360 if (match_option(option, "-XX:+PrintVMOptions")) {
3361 PrintVMOptions = true;
3362 continue;
3363 }
3364 if (match_option(option, "-XX:-PrintVMOptions")) {
3365 PrintVMOptions = false;
3366 continue;
3367 }
3368 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3369 IgnoreUnrecognizedVMOptions = true;
3370 continue;
3371 }
3372 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3373 IgnoreUnrecognizedVMOptions = false;
3374 continue;
3375 }
3376 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3377 JVMFlag::printFlags(tty, false);
3378 vm_exit(0);
3379 }
3380
3381 #ifndef PRODUCT
3382 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3383 JVMFlag::printFlags(tty, true);
3384 vm_exit(0);
3385 }
3386 #endif
3387 }
3388 return JNI_OK;
3389 }
3390
3391 static void print_options(const JavaVMInitArgs *args) {
3392 const char* tail;
3393 for (int index = 0; index < args->nOptions; index++) {
3394 const JavaVMOption *option = args->options + index;
3395 if (match_option(option, "-XX:", &tail)) {
3396 logOption(tail);
3397 }
3398 }
3399 }
3400
3401 bool Arguments::handle_deprecated_print_gc_flags() {
3402 if (PrintGC) {
3403 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3404 }
3405 if (PrintGCDetails) {
3406 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3407 }
3408
3409 if (_legacyGCLogging.lastFlag == 2) {
3410 // -Xloggc was used to specify a filename
3411 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3412
3413 LogTarget(Error, logging) target;
3414 LogStream errstream(target);
3415 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3416 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3417 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3418 }
3419 return true;
3420 }
3421
3422 static void apply_debugger_ergo() {
3423 #ifdef ASSERT
3424 if (ReplayCompiles) {
3425 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3426 }
3427
3428 if (UseDebuggerErgo) {
3429 // Turn on sub-flags
3430 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3431 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3432 }
3433
3434 if (UseDebuggerErgo2) {
3435 // Debugging with limited number of CPUs
3436 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3437 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3438 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3439 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3440 }
3441 #endif // ASSERT
3442 }
3443
3444 // Parse entry point called from JNI_CreateJavaVM
3445
3446 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3447 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3448 JVMFlag::check_all_flag_declarations();
3449
3450 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3451 const char* hotspotrc = ".hotspotrc";
3452 bool settings_file_specified = false;
3453 bool needs_hotspotrc_warning = false;
3454 ScopedVMInitArgs initial_vm_options_args("");
3455 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3456 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3457
3458 // Pointers to current working set of containers
3459 JavaVMInitArgs* cur_cmd_args;
3460 JavaVMInitArgs* cur_vm_options_args;
3461 JavaVMInitArgs* cur_java_options_args;
3462 JavaVMInitArgs* cur_java_tool_options_args;
3463
3464 // Containers for modified/expanded options
3465 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3466 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3467 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3468 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3469
3470
3471 jint code =
3472 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3473 if (code != JNI_OK) {
3474 return code;
3475 }
3476
3477 code = parse_java_options_environment_variable(&initial_java_options_args);
3478 if (code != JNI_OK) {
3479 return code;
3480 }
3481
3482 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3483 char *vmoptions = ClassLoader::lookup_vm_options();
3484 if (vmoptions != nullptr) {
3485 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3486 FREE_C_HEAP_ARRAY(char, vmoptions);
3487 if (code != JNI_OK) {
3488 return code;
3489 }
3490 }
3491
3492 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3493 &mod_java_tool_options_args,
3494 &cur_java_tool_options_args);
3495 if (code != JNI_OK) {
3496 return code;
3497 }
3498
3499 code = expand_vm_options_as_needed(initial_cmd_args,
3500 &mod_cmd_args,
3501 &cur_cmd_args);
3502 if (code != JNI_OK) {
3503 return code;
3504 }
3505
3506 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3507 &mod_java_options_args,
3508 &cur_java_options_args);
3509 if (code != JNI_OK) {
3510 return code;
3511 }
3512
3513 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3514 &mod_vm_options_args,
3515 &cur_vm_options_args);
3516 if (code != JNI_OK) {
3517 return code;
3518 }
3519
3520 const char* flags_file = Arguments::get_jvm_flags_file();
3521 settings_file_specified = (flags_file != nullptr);
3522
3523 if (IgnoreUnrecognizedVMOptions) {
3524 cur_cmd_args->ignoreUnrecognized = true;
3525 cur_java_tool_options_args->ignoreUnrecognized = true;
3526 cur_java_options_args->ignoreUnrecognized = true;
3527 }
3528
3529 // Parse specified settings file
3530 if (settings_file_specified) {
3531 if (!process_settings_file(flags_file, true,
3532 cur_cmd_args->ignoreUnrecognized)) {
3533 return JNI_EINVAL;
3534 }
3535 } else {
3536 #ifdef ASSERT
3537 // Parse default .hotspotrc settings file
3538 if (!process_settings_file(".hotspotrc", false,
3539 cur_cmd_args->ignoreUnrecognized)) {
3540 return JNI_EINVAL;
3541 }
3542 #else
3543 struct stat buf;
3544 if (os::stat(hotspotrc, &buf) == 0) {
3545 needs_hotspotrc_warning = true;
3546 }
3547 #endif
3548 }
3549
3550 if (PrintVMOptions) {
3551 print_options(cur_java_tool_options_args);
3552 print_options(cur_cmd_args);
3553 print_options(cur_java_options_args);
3554 }
3555
3556 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3557 jint result = parse_vm_init_args(cur_vm_options_args,
3558 cur_java_tool_options_args,
3559 cur_java_options_args,
3560 cur_cmd_args);
3561
3562 if (result != JNI_OK) {
3563 return result;
3564 }
3565
3566 // Delay warning until here so that we've had a chance to process
3567 // the -XX:-PrintWarnings flag
3568 if (needs_hotspotrc_warning) {
3569 warning("%s file is present but has been ignored. "
3570 "Run with -XX:Flags=%s to load the file.",
3571 hotspotrc, hotspotrc);
3572 }
3573
3574 if (needs_module_property_warning) {
3575 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3576 " names that are reserved for internal use.");
3577 }
3578
3579 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3580 UNSUPPORTED_OPTION(UseLargePages);
3581 #endif
3582
3583 #if defined(AIX)
3584 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3585 #endif
3586
3587 #ifndef PRODUCT
3588 if (TraceBytecodesAt != 0) {
3589 TraceBytecodes = true;
3590 }
3591 #endif // PRODUCT
3592
3593 if (ScavengeRootsInCode == 0) {
3594 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3595 warning("Forcing ScavengeRootsInCode non-zero");
3596 }
3597 ScavengeRootsInCode = 1;
3598 }
3599
3600 if (!handle_deprecated_print_gc_flags()) {
3601 return JNI_EINVAL;
3602 }
3603
3604 // Set object alignment values.
3605 set_object_alignment();
3606
3607 #if !INCLUDE_CDS
3608 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3609 jio_fprintf(defaultStream::error_stream(),
3610 "Shared spaces are not supported in this VM\n");
3611 return JNI_ERR;
3612 }
3613 if (DumpLoadedClassList != nullptr) {
3614 jio_fprintf(defaultStream::error_stream(),
3615 "DumpLoadedClassList is not supported in this VM\n");
3616 return JNI_ERR;
3617 }
3618 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3619 log_is_enabled(Info, cds)) {
3620 warning("Shared spaces are not supported in this VM");
3621 UseSharedSpaces = false;
3622 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3623 }
3624 no_shared_spaces("CDS Disabled");
3625 #endif // INCLUDE_CDS
3626
3627 // Verify NMT arguments
3628 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3629 if (lvl == NMT_unknown) {
3630 jio_fprintf(defaultStream::error_stream(),
3631 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3632 return JNI_ERR;
3633 }
3634 if (PrintNMTStatistics && lvl == NMT_off) {
3635 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3636 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3637 }
3638
3639 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3640 if (trace_dependencies && VerifyDependencies) {
3641 warning("dependency logging results may be inflated by VerifyDependencies");
3642 }
3643
3644 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3645 log_is_enabled(Info, class, load, cause);
3646 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3647 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3648 }
3649
3650 apply_debugger_ergo();
3651
3652 // The VMThread needs to stop now and then to execute these debug options.
3653 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3654 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3655 }
3656
3657 if (log_is_enabled(Info, arguments)) {
3658 LogStream st(Log(arguments)::info());
3659 Arguments::print_on(&st);
3660 }
3661
3662 return JNI_OK;
3663 }
3664
3665 jint Arguments::apply_ergo() {
3666 // Set flags based on ergonomics.
3667 jint result = set_ergonomics_flags();
3668 if (result != JNI_OK) return result;
3669
3670 // Set heap size based on available physical memory
3671 set_heap_size();
3672
3673 GCConfig::arguments()->initialize();
3674
3675 CDSConfig::initialize();
3676
3677 // Initialize Metaspace flags and alignments
3678 Metaspace::ergo_initialize();
3679
3680 if (!StringDedup::ergo_initialize()) {
3681 return JNI_EINVAL;
3682 }
3683
3684 // Set compiler flags after GC is selected and GC specific
3685 // flags (LoopStripMiningIter) are set.
3686 CompilerConfig::ergo_initialize();
3687
3688 // Set bytecode rewriting flags
3689 set_bytecode_flags();
3690
3691 // Set flags if aggressive optimization flags are enabled
3692 jint code = set_aggressive_opts_flags();
3693 if (code != JNI_OK) {
3694 return code;
3695 }
3696
3697 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3698 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3699 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3700 warning("UseSecondarySupersTable is not supported");
3701 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3702 }
3703 UseSecondarySupersTable = false; // FIXME: Disabled for Leyden. Neet to fix SCAddressTable::id_for_address()
3704 if (!UseSecondarySupersTable) {
3705 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3706 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3707 }
3708
3709 #ifdef ZERO
3710 // Clear flags not supported on zero.
3711 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3712 #endif // ZERO
3713
3714 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3715 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3716 DebugNonSafepoints = true;
3717 }
3718
3719 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3720 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3721 }
3722
3723 // Treat the odd case where local verification is enabled but remote
3724 // verification is not as if both were enabled.
3725 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3726 log_info(verification)("Turning on remote verification because local verification is on");
3727 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3728 }
3729
3730 #ifndef PRODUCT
3731 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3732 if (use_vm_log()) {
3733 LogVMOutput = true;
3734 }
3735 }
3736 #endif // PRODUCT
3737
3738 if (PrintCommandLineFlags) {
3739 JVMFlag::printSetFlags(tty);
3740 }
3741
3742 #if COMPILER2_OR_JVMCI
3743 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3744 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3745 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3746 }
3747 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3748
3749 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3750 if (!EnableVectorReboxing) {
3751 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3752 } else {
3753 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3754 }
3755 }
3756 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3757
3758 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3759 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3760 }
3761 FLAG_SET_DEFAULT(UseVectorStubs, false);
3762 }
3763 #endif // COMPILER2_OR_JVMCI
3764
3765 if (log_is_enabled(Info, init)) {
3766 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3767 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3768 }
3769 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3770 // automatically enable -Xlog:perf+class+link
3771 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3772 }
3773 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3774 } else {
3775 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3776 warning("Disabling ProfileVMLocks since logging is turned off.");
3777 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3778 }
3779 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3780 warning("Disabling ProfileVMCalls since logging is turned off.");
3781 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3782 }
3783 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3784 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3785 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3786 }
3787 if (log_is_enabled(Info, perf, class, link)) {
3788 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3789 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3790 }
3791 }
3792 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3793 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3794 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3795 }
3796 }
3797
3798 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3799 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3800 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3801 }
3802 }
3803 return JNI_OK;
3804 }
3805
3806 jint Arguments::adjust_after_os() {
3807 if (UseNUMA) {
3808 if (UseParallelGC) {
3809 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3810 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3811 }
3812 }
3813 }
3814 return JNI_OK;
3815 }
3816
3817 int Arguments::PropertyList_count(SystemProperty* pl) {
3818 int count = 0;
3819 while(pl != nullptr) {
3820 count++;
3821 pl = pl->next();
3822 }
3823 return count;
3824 }
3825
3826 // Return the number of readable properties.
3827 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3828 int count = 0;
3829 while(pl != nullptr) {
3830 if (pl->readable()) {
3831 count++;
3832 }
3833 pl = pl->next();
3834 }
3835 return count;
3836 }
3837
3838 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3839 assert(key != nullptr, "just checking");
3840 SystemProperty* prop;
3841 for (prop = pl; prop != nullptr; prop = prop->next()) {
3842 if (strcmp(key, prop->key()) == 0) return prop->value();
3843 }
3844 return nullptr;
3845 }
3846
3847 // Return the value of the requested property provided that it is a readable property.
3848 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3849 assert(key != nullptr, "just checking");
3850 SystemProperty* prop;
3851 // Return the property value if the keys match and the property is not internal or
3852 // it's the special internal property "jdk.boot.class.path.append".
3853 for (prop = pl; prop != nullptr; prop = prop->next()) {
3854 if (strcmp(key, prop->key()) == 0) {
3855 if (!prop->internal()) {
3856 return prop->value();
3857 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3858 return prop->value();
3859 } else {
3860 // Property is internal and not jdk.boot.class.path.append so return null.
3861 return nullptr;
3862 }
3863 }
3864 }
3865 return nullptr;
3866 }
3867
3868 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3869 SystemProperty* p = *plist;
3870 if (p == nullptr) {
3871 *plist = new_p;
3872 } else {
3873 while (p->next() != nullptr) {
3874 p = p->next();
3875 }
3876 p->set_next(new_p);
3877 }
3878 }
3879
3880 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3881 bool writeable, bool internal) {
3882 if (plist == nullptr)
3883 return;
3884
3885 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3886 PropertyList_add(plist, new_p);
3887 }
3888
3889 void Arguments::PropertyList_add(SystemProperty *element) {
3890 PropertyList_add(&_system_properties, element);
3891 }
3892
3893 // This add maintains unique property key in the list.
3894 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3895 PropertyAppendable append, PropertyWriteable writeable,
3896 PropertyInternal internal) {
3897 if (plist == nullptr)
3898 return;
3899
3900 // If property key exists and is writeable, then update with new value.
3901 // Trying to update a non-writeable property is silently ignored.
3902 SystemProperty* prop;
3903 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3904 if (strcmp(k, prop->key()) == 0) {
3905 if (append == AppendProperty) {
3906 prop->append_writeable_value(v);
3907 } else {
3908 prop->set_writeable_value(v);
3909 }
3910 return;
3911 }
3912 }
3913
3914 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3915 }
3916
3917 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3918 // Returns true if all of the source pointed by src has been copied over to
3919 // the destination buffer pointed by buf. Otherwise, returns false.
3920 // Notes:
3921 // 1. If the length (buflen) of the destination buffer excluding the
3922 // null terminator character is not long enough for holding the expanded
3923 // pid characters, it also returns false instead of returning the partially
3924 // expanded one.
3925 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3926 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3927 char* buf, size_t buflen) {
3928 const char* p = src;
3929 char* b = buf;
3930 const char* src_end = &src[srclen];
3931 char* buf_end = &buf[buflen - 1];
3932
3933 while (p < src_end && b < buf_end) {
3934 if (*p == '%') {
3935 switch (*(++p)) {
3936 case '%': // "%%" ==> "%"
3937 *b++ = *p++;
3938 break;
3939 case 'p': { // "%p" ==> current process id
3940 // buf_end points to the character before the last character so
3941 // that we could write '\0' to the end of the buffer.
3942 size_t buf_sz = buf_end - b + 1;
3943 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3944
3945 // if jio_snprintf fails or the buffer is not long enough to hold
3946 // the expanded pid, returns false.
3947 if (ret < 0 || ret >= (int)buf_sz) {
3948 return false;
3949 } else {
3950 b += ret;
3951 assert(*b == '\0', "fail in copy_expand_pid");
3952 if (p == src_end && b == buf_end + 1) {
3953 // reach the end of the buffer.
3954 return true;
3955 }
3956 }
3957 p++;
3958 break;
3959 }
3960 default :
3961 *b++ = '%';
3962 }
3963 } else {
3964 *b++ = *p++;
3965 }
3966 }
3967 *b = '\0';
3968 return (p == src_end); // return false if not all of the source was copied
3969 }