1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "compiler/compilerDefinitions.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/stringdedup/stringDedup.hpp"
38 #include "gc/shared/tlab_globals.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logConfiguration.hpp"
42 #include "logging/logStream.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "nmt/nmtCommon.hpp"
46 #include "oops/compressedKlass.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiAgentList.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/flags/jvmFlag.hpp"
53 #include "runtime/flags/jvmFlagAccess.hpp"
54 #include "runtime/flags/jvmFlagLimit.hpp"
55 #include "runtime/globals_extension.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepoint.hpp"
59 #include "runtime/safepointMechanism.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "services/management.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/checkedCast.hpp"
65 #include "utilities/debug.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/macros.hpp"
68 #include "utilities/parseInteger.hpp"
69 #include "utilities/powerOfTwo.hpp"
70 #include "utilities/stringUtils.hpp"
71 #include "utilities/systemMemoryBarrier.hpp"
72 #if INCLUDE_JFR
73 #include "jfr/jfr.hpp"
74 #endif
75
76 #include <limits>
77
78 static const char _default_java_launcher[] = "generic";
79
80 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
81
82 char* Arguments::_jvm_flags_file = nullptr;
83 char** Arguments::_jvm_flags_array = nullptr;
84 int Arguments::_num_jvm_flags = 0;
85 char** Arguments::_jvm_args_array = nullptr;
86 int Arguments::_num_jvm_args = 0;
87 char* Arguments::_java_command = nullptr;
88 SystemProperty* Arguments::_system_properties = nullptr;
89 size_t Arguments::_conservative_max_heap_alignment = 0;
90 Arguments::Mode Arguments::_mode = _mixed;
91 const char* Arguments::_java_vendor_url_bug = nullptr;
92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
93 bool Arguments::_sun_java_launcher_is_altjvm = false;
94
95 // These parameters are reset in method parse_vm_init_args()
96 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
97 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
98 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
99 bool Arguments::_ClipInlining = ClipInlining;
100 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
101
102 bool Arguments::_enable_preview = false;
103
104 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
105
106 // These are not set by the JDK's built-in launchers, but they can be set by
107 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
108 // JavaVMOption in jni.h.
109 abort_hook_t Arguments::_abort_hook = nullptr;
110 exit_hook_t Arguments::_exit_hook = nullptr;
111 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
115 SystemProperty *Arguments::_java_library_path = nullptr;
116 SystemProperty *Arguments::_java_home = nullptr;
117 SystemProperty *Arguments::_java_class_path = nullptr;
118 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
119 SystemProperty *Arguments::_vm_info = nullptr;
120
121 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
122 PathString *Arguments::_boot_class_path = nullptr;
123 bool Arguments::_has_jimage = false;
124
125 char* Arguments::_ext_dirs = nullptr;
126
127 // True if -Xshare:auto option was specified.
128 static bool xshare_auto_cmd_line = false;
129
130 // True if -Xint/-Xmixed/-Xcomp were specified
131 static bool mode_flag_cmd_line = false;
132
133 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
134 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
135 if (new_value == nullptr) {
136 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
137 return false;
138 }
139 if (_value != nullptr) {
140 FreeHeap(_value);
141 }
142 _value = new_value;
143 strcpy(_value, value);
144 return true;
145 }
146
147 void PathString::append_value(const char *value) {
148 char *sp;
149 size_t len = 0;
150 if (value != nullptr) {
151 len = strlen(value);
152 if (_value != nullptr) {
153 len += strlen(_value);
154 }
155 sp = AllocateHeap(len+2, mtArguments);
156 assert(sp != nullptr, "Unable to allocate space for new append path value");
157 if (sp != nullptr) {
158 if (_value != nullptr) {
159 strcpy(sp, _value);
160 strcat(sp, os::path_separator());
161 strcat(sp, value);
162 FreeHeap(_value);
163 } else {
164 strcpy(sp, value);
165 }
166 _value = sp;
167 }
168 }
169 }
170
171 PathString::PathString(const char* value) {
172 if (value == nullptr) {
173 _value = nullptr;
174 } else {
175 _value = AllocateHeap(strlen(value)+1, mtArguments);
176 strcpy(_value, value);
177 }
178 }
179
180 PathString::~PathString() {
181 if (_value != nullptr) {
182 FreeHeap(_value);
183 _value = nullptr;
184 }
185 }
186
187 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
188 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
189 size_t len = strlen(module_name) + 1;
190 _module_name = AllocateHeap(len, mtInternal);
191 strncpy(_module_name, module_name, len); // copy the trailing null
192 _path = new PathString(path);
193 }
194
195 ModulePatchPath::~ModulePatchPath() {
196 if (_module_name != nullptr) {
197 FreeHeap(_module_name);
198 _module_name = nullptr;
199 }
200 if (_path != nullptr) {
201 delete _path;
202 _path = nullptr;
203 }
204 }
205
206 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
207 if (key == nullptr) {
208 _key = nullptr;
209 } else {
210 _key = AllocateHeap(strlen(key)+1, mtArguments);
211 strcpy(_key, key);
212 }
213 _next = nullptr;
214 _internal = internal;
215 _writeable = writeable;
216 }
217
218 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
219 // part of the option string.
220 static bool match_option(const JavaVMOption *option, const char* name,
221 const char** tail) {
222 size_t len = strlen(name);
223 if (strncmp(option->optionString, name, len) == 0) {
224 *tail = option->optionString + len;
225 return true;
226 } else {
227 return false;
228 }
229 }
230
231 // Check if 'option' matches 'name'. No "tail" is allowed.
232 static bool match_option(const JavaVMOption *option, const char* name) {
233 const char* tail = nullptr;
234 bool result = match_option(option, name, &tail);
235 if (tail != nullptr && *tail == '\0') {
236 return result;
237 } else {
238 return false;
239 }
240 }
241
242 // Return true if any of the strings in null-terminated array 'names' matches.
243 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
244 // the option must match exactly.
245 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
246 bool tail_allowed) {
247 for (/* empty */; *names != nullptr; ++names) {
248 if (match_option(option, *names, tail)) {
249 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
250 return true;
251 }
252 }
253 }
254 return false;
255 }
256
257 #if INCLUDE_JFR
258 static bool _has_jfr_option = false; // is using JFR
259
260 // return true on failure
261 static bool match_jfr_option(const JavaVMOption** option) {
262 assert((*option)->optionString != nullptr, "invariant");
263 char* tail = nullptr;
264 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
265 _has_jfr_option = true;
266 return Jfr::on_start_flight_recording_option(option, tail);
267 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
268 _has_jfr_option = true;
269 return Jfr::on_flight_recorder_option(option, tail);
270 }
271 return false;
272 }
273
274 bool Arguments::has_jfr_option() {
275 return _has_jfr_option;
276 }
277 #endif
278
279 static void logOption(const char* opt) {
280 if (PrintVMOptions) {
281 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
282 }
283 }
284
285 bool needs_module_property_warning = false;
286
287 #define MODULE_PROPERTY_PREFIX "jdk.module."
288 #define MODULE_PROPERTY_PREFIX_LEN 11
289 #define ADDEXPORTS "addexports"
290 #define ADDEXPORTS_LEN 10
291 #define ADDREADS "addreads"
292 #define ADDREADS_LEN 8
293 #define ADDOPENS "addopens"
294 #define ADDOPENS_LEN 8
295 #define PATCH "patch"
296 #define PATCH_LEN 5
297 #define ADDMODS "addmods"
298 #define ADDMODS_LEN 7
299 #define LIMITMODS "limitmods"
300 #define LIMITMODS_LEN 9
301 #define PATH "path"
302 #define PATH_LEN 4
303 #define UPGRADE_PATH "upgrade.path"
304 #define UPGRADE_PATH_LEN 12
305 #define ENABLE_NATIVE_ACCESS "enable.native.access"
306 #define ENABLE_NATIVE_ACCESS_LEN 20
307
308 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
309 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
310 return ((strncmp(option, property, len) == 0) &&
311 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
312 }
313
314 // Return true if property starts with "jdk.module." and its ensuing chars match
315 // any of the reserved module properties.
316 // property should be passed without the leading "-D".
317 bool Arguments::is_internal_module_property(const char* property) {
318 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
327 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
330 return true;
331 }
332 }
333 return false;
334 }
335
336 // Process java launcher properties.
337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
339 // Must do this before setting up other system properties,
340 // as some of them may depend on launcher type.
341 for (int index = 0; index < args->nOptions; index++) {
342 const JavaVMOption* option = args->options + index;
343 const char* tail;
344
345 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
346 process_java_launcher_argument(tail, option->extraInfo);
347 continue;
348 }
349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
350 if (strcmp(tail, "true") == 0) {
351 _sun_java_launcher_is_altjvm = true;
352 }
353 continue;
354 }
355 }
356 }
357
358 // Initialize system properties key and value.
359 void Arguments::init_system_properties() {
360
361 // Set up _boot_class_path which is not a property but
362 // relies heavily on argument processing and the jdk.boot.class.path.append
363 // property. It is used to store the underlying boot class path.
364 _boot_class_path = new PathString(nullptr);
365
366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
367 "Java Virtual Machine Specification", false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
371
372 // Initialize the vm.info now, but it will need updating after argument parsing.
373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
374
375 // Following are JVMTI agent writable properties.
376 // Properties values are set to nullptr and they are
377 // os specific they are initialized in os::init_system_properties_values().
378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
379 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
380 _java_home = new SystemProperty("java.home", nullptr, true);
381 _java_class_path = new SystemProperty("java.class.path", "", true);
382 // jdk.boot.class.path.append is a non-writeable, internal property.
383 // It can only be set by either:
384 // - -Xbootclasspath/a:
385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
387
388 // Add to System Property list.
389 PropertyList_add(&_system_properties, _sun_boot_library_path);
390 PropertyList_add(&_system_properties, _java_library_path);
391 PropertyList_add(&_system_properties, _java_home);
392 PropertyList_add(&_system_properties, _java_class_path);
393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
394 PropertyList_add(&_system_properties, _vm_info);
395
396 // Set OS specific system properties values
397 os::init_system_properties_values();
398 }
399
400 // Update/Initialize System properties after JDK version number is known
401 void Arguments::init_version_specific_system_properties() {
402 enum { bufsz = 16 };
403 char buffer[bufsz];
404 const char* spec_vendor = "Oracle Corporation";
405 uint32_t spec_version = JDK_Version::current().major_version();
406
407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
408
409 PropertyList_add(&_system_properties,
410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
411 PropertyList_add(&_system_properties,
412 new SystemProperty("java.vm.specification.version", buffer, false));
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
415 }
416
417 /*
418 * -XX argument processing:
419 *
420 * -XX arguments are defined in several places, such as:
421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
422 * -XX arguments are parsed in parse_argument().
423 * -XX argument bounds checking is done in check_vm_args_consistency().
424 *
425 * Over time -XX arguments may change. There are mechanisms to handle common cases:
426 *
427 * ALIASED: An option that is simply another name for another option. This is often
428 * part of the process of deprecating a flag, but not all aliases need
429 * to be deprecated.
430 *
431 * Create an alias for an option by adding the old and new option names to the
432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
433 *
434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
435 * support may be removed in the future. Both regular and aliased options may be
436 * deprecated.
437 *
438 * Add a deprecation warning for an option (or alias) by adding an entry in the
439 * "special_jvm_flags" table and setting the "deprecated_in" field.
440 * Often an option "deprecated" in one major release will
441 * be made "obsolete" in the next. In this case the entry should also have its
442 * "obsolete_in" field set.
443 *
444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
445 * on the command line. A warning is printed to let the user know that option might not
446 * be accepted in the future.
447 *
448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
449 * table and setting the "obsolete_in" field.
450 *
451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
452 * to the current JDK version. The system will flatly refuse to admit the existence of
453 * the flag. This allows a flag to die automatically over JDK releases.
454 *
455 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
457 * - Newly obsolete or expired deprecated options should have their global variable
458 * definitions removed (from globals.hpp, etc) and related implementations removed.
459 *
460 * Recommended approach for removing options:
461 *
462 * To remove options commonly used by customers (e.g. product -XX options), use
463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
464 *
465 * To remove internal options (e.g. diagnostic, experimental, develop options), use
466 * a 2-step model adding major release numbers to the obsolete and expire columns.
467 *
468 * To change the name of an option, use the alias table as well as a 2-step
469 * model adding major release numbers to the deprecate and expire columns.
470 * Think twice about aliasing commonly used customer options.
471 *
472 * There are times when it is appropriate to leave a future release number as undefined.
473 *
474 * Tests: Aliases should be tested in VMAliasOptions.java.
475 * Deprecated options should be tested in VMDeprecatedOptions.java.
476 */
477
478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
481 // the command-line as usual, but will issue a warning.
482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
483 // the command-line, while issuing a warning and ignoring the flag value.
484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
485 // existence of the flag.
486 //
487 // MANUAL CLEANUP ON JDK VERSION UPDATES:
488 // This table ensures that the handling of options will update automatically when the JDK
489 // version is incremented, but the source code needs to be cleanup up manually:
490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
491 // variable should be removed, as well as users of the variable.
492 // - As "deprecated" options age into "obsolete" options, move the entry into the
493 // "Obsolete Flags" section of the table.
494 // - All expired options should be removed from the table.
495 static SpecialFlag const special_jvm_flags[] = {
496 // -------------- Deprecated Flags --------------
497 // --- Non-alias flags - sorted by obsolete_in then expired_in:
498 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
502 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
503 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
504 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
505 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
506 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
507 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
508 { "RegisterFinalizersAtInit", JDK_Version::jdk(22), JDK_Version::jdk(23), JDK_Version::jdk(24) },
509
510 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
511 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
512 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
514
515 // -------------- Obsolete Flags - sorted by expired_in --------------
516
517 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
518 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
519 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
520 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
521 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
522 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
523
524 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
525 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
526 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
527 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
528 { "DoReserveCopyInSuperWord", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
529 { "UseCounterDecay", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
530
531 #ifdef LINUX
532 { "UseHugeTLBFS", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
533 { "UseSHM", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
534 #endif
535
536 #ifdef ASSERT
537 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
538 #endif
539
540 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
541 // These entries will generate build errors. Their purpose is to test the macros.
542 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
543 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
544 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
545 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
546 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
547 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
548 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
549 #endif
550
551 { nullptr, JDK_Version(0), JDK_Version(0) }
552 };
553
554 // Flags that are aliases for other flags.
555 typedef struct {
556 const char* alias_name;
557 const char* real_name;
558 } AliasedFlag;
559
560 static AliasedFlag const aliased_jvm_flags[] = {
561 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
562 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
563 { nullptr, nullptr}
564 };
565
566 // Return true if "v" is less than "other", where "other" may be "undefined".
567 static bool version_less_than(JDK_Version v, JDK_Version other) {
568 assert(!v.is_undefined(), "must be defined");
569 if (!other.is_undefined() && v.compare(other) >= 0) {
570 return false;
571 } else {
572 return true;
573 }
574 }
575
576 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
577 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
578 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
579 flag = special_jvm_flags[i];
580 return true;
581 }
582 }
583 return false;
584 }
585
586 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
587 assert(version != nullptr, "Must provide a version buffer");
588 SpecialFlag flag;
589 if (lookup_special_flag(flag_name, flag)) {
590 if (!flag.obsolete_in.is_undefined()) {
591 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
592 *version = flag.obsolete_in;
593 // This flag may have been marked for obsoletion in this version, but we may not
594 // have actually removed it yet. Rather than ignoring it as soon as we reach
595 // this version we allow some time for the removal to happen. So if the flag
596 // still actually exists we process it as normal, but issue an adjusted warning.
597 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
598 if (real_flag != nullptr) {
599 char version_str[256];
600 version->to_string(version_str, sizeof(version_str));
601 warning("Temporarily processing option %s; support is scheduled for removal in %s",
602 flag_name, version_str);
603 return false;
604 }
605 return true;
606 }
607 }
608 }
609 return false;
610 }
611
612 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
613 assert(version != nullptr, "Must provide a version buffer");
614 SpecialFlag flag;
615 if (lookup_special_flag(flag_name, flag)) {
616 if (!flag.deprecated_in.is_undefined()) {
617 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
618 version_less_than(JDK_Version::current(), flag.expired_in)) {
619 *version = flag.deprecated_in;
620 return 1;
621 } else {
622 return -1;
623 }
624 }
625 }
626 return 0;
627 }
628
629 const char* Arguments::real_flag_name(const char *flag_name) {
630 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
631 const AliasedFlag& flag_status = aliased_jvm_flags[i];
632 if (strcmp(flag_status.alias_name, flag_name) == 0) {
633 return flag_status.real_name;
634 }
635 }
636 return flag_name;
637 }
638
639 #ifdef ASSERT
640 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
641 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
642 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
643 return true;
644 }
645 }
646 return false;
647 }
648
649 // Verifies the correctness of the entries in the special_jvm_flags table.
650 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
651 // version being earlier than the deprecation version, then a warning is issued
652 // and verification fails - by returning false. If it is detected that the table
653 // is out of date, with respect to the current version, then ideally a warning is
654 // issued but verification does not fail. This allows the VM to operate when the
655 // version is first updated, without needing to update all the impacted flags at
656 // the same time. In practice we can't issue the warning immediately when the version
657 // is updated as it occurs for every test and some tests are not prepared to handle
658 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
659 // if the check_globals flag is true, and in addition allow a grace period and only
660 // check for stale flags when we hit build 25 (which is far enough into the 6 month
661 // release cycle that all flag updates should have been processed, whilst still
662 // leaving time to make the change before RDP2).
663 // We use a gtest to call this, passing true, so that we can detect stale flags before
664 // the end of the release cycle.
665
666 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
667
668 bool Arguments::verify_special_jvm_flags(bool check_globals) {
669 bool success = true;
670 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
671 const SpecialFlag& flag = special_jvm_flags[i];
672 if (lookup_special_flag(flag.name, i)) {
673 warning("Duplicate special flag declaration \"%s\"", flag.name);
674 success = false;
675 }
676 if (flag.deprecated_in.is_undefined() &&
677 flag.obsolete_in.is_undefined()) {
678 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
679 success = false;
680 }
681
682 if (!flag.deprecated_in.is_undefined()) {
683 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
684 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
685 success = false;
686 }
687
688 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
689 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
690 success = false;
691 }
692 }
693
694 if (!flag.obsolete_in.is_undefined()) {
695 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
696 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
697 success = false;
698 }
699
700 // if flag has become obsolete it should not have a "globals" flag defined anymore.
701 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
702 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
703 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
704 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
705 success = false;
706 }
707 }
708
709 } else if (!flag.expired_in.is_undefined()) {
710 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
711 success = false;
712 }
713
714 if (!flag.expired_in.is_undefined()) {
715 // if flag has become expired it should not have a "globals" flag defined anymore.
716 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
717 !version_less_than(JDK_Version::current(), flag.expired_in)) {
718 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
719 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
720 success = false;
721 }
722 }
723 }
724 }
725 return success;
726 }
727 #endif
728
729 bool Arguments::atojulong(const char *s, julong* result) {
730 return parse_integer(s, result);
731 }
732
733 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
734 if (size < min_size) return arg_too_small;
735 if (size > max_size) return arg_too_big;
736 return arg_in_range;
737 }
738
739 // Describe an argument out of range error
740 void Arguments::describe_range_error(ArgsRange errcode) {
741 switch(errcode) {
742 case arg_too_big:
743 jio_fprintf(defaultStream::error_stream(),
744 "The specified size exceeds the maximum "
745 "representable size.\n");
746 break;
747 case arg_too_small:
748 case arg_unreadable:
749 case arg_in_range:
750 // do nothing for now
751 break;
752 default:
753 ShouldNotReachHere();
754 }
755 }
756
757 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
758 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
759 return true;
760 } else {
761 return false;
762 }
763 }
764
765 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
766 // strtod allows leading whitespace, but our flag format does not.
767 if (*value == '\0' || isspace(*value)) {
768 return false;
769 }
770 char* end;
771 errno = 0;
772 double v = strtod(value, &end);
773 if ((errno != 0) || (*end != 0)) {
774 return false;
775 }
776 if (g_isnan(v) || !g_isfinite(v)) {
777 // Currently we cannot handle these special values.
778 return false;
779 }
780
781 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
782 return true;
783 }
784 return false;
785 }
786
787 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
788 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
789
790 if (flag->is_int()) {
791 int v;
792 if (parse_integer(value, &v)) {
793 result = JVMFlagAccess::set_int(flag, &v, origin);
794 }
795 } else if (flag->is_uint()) {
796 uint v;
797 if (parse_integer(value, &v)) {
798 result = JVMFlagAccess::set_uint(flag, &v, origin);
799 }
800 } else if (flag->is_intx()) {
801 intx v;
802 if (parse_integer(value, &v)) {
803 result = JVMFlagAccess::set_intx(flag, &v, origin);
804 }
805 } else if (flag->is_uintx()) {
806 uintx v;
807 if (parse_integer(value, &v)) {
808 result = JVMFlagAccess::set_uintx(flag, &v, origin);
809 }
810 } else if (flag->is_uint64_t()) {
811 uint64_t v;
812 if (parse_integer(value, &v)) {
813 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
814 }
815 } else if (flag->is_size_t()) {
816 size_t v;
817 if (parse_integer(value, &v)) {
818 result = JVMFlagAccess::set_size_t(flag, &v, origin);
819 }
820 }
821
822 return result == JVMFlag::SUCCESS;
823 }
824
825 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
826 if (value[0] == '\0') {
827 value = nullptr;
828 }
829 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
830 // Contract: JVMFlag always returns a pointer that needs freeing.
831 FREE_C_HEAP_ARRAY(char, value);
832 return true;
833 }
834
835 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
836 const char* old_value = "";
837 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
838 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
839 size_t new_len = strlen(new_value);
840 const char* value;
841 char* free_this_too = nullptr;
842 if (old_len == 0) {
843 value = new_value;
844 } else if (new_len == 0) {
845 value = old_value;
846 } else {
847 size_t length = old_len + 1 + new_len + 1;
848 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
849 // each new setting adds another LINE to the switch:
850 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
851 value = buf;
852 free_this_too = buf;
853 }
854 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
855 // JVMFlag always returns a pointer that needs freeing.
856 FREE_C_HEAP_ARRAY(char, value);
857 // JVMFlag made its own copy, so I must delete my own temp. buffer.
858 FREE_C_HEAP_ARRAY(char, free_this_too);
859 return true;
860 }
861
862 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
863 const char* real_name = real_flag_name(arg);
864 JDK_Version since = JDK_Version();
865 switch (is_deprecated_flag(arg, &since)) {
866 case -1: {
867 // Obsolete or expired, so don't process normally,
868 // but allow for an obsolete flag we're still
869 // temporarily allowing.
870 if (!is_obsolete_flag(arg, &since)) {
871 return real_name;
872 }
873 // Note if we're not considered obsolete then we can't be expired either
874 // as obsoletion must come first.
875 return nullptr;
876 }
877 case 0:
878 return real_name;
879 case 1: {
880 char version[256];
881 since.to_string(version, sizeof(version));
882 if (real_name != arg) {
883 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
884 arg, version, real_name);
885 } else {
886 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
887 arg, version);
888 }
889 return real_name;
890 }
891 }
892 ShouldNotReachHere();
893 return nullptr;
894 }
895
896 #define BUFLEN 255
897
898 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
899 char name_copied[BUFLEN+1];
900 if (name[name_length] != 0) {
901 if (name_length > BUFLEN) {
902 return nullptr;
903 } else {
904 strncpy(name_copied, name, name_length);
905 name_copied[name_length] = '\0';
906 name = name_copied;
907 }
908 }
909
910 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
911 if (real_name == nullptr) {
912 return nullptr;
913 }
914 JVMFlag* flag = JVMFlag::find_flag(real_name);
915 return flag;
916 }
917
918 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
919 bool is_bool = false;
920 bool bool_val = false;
921 char c = *arg;
922 if (c == '+' || c == '-') {
923 is_bool = true;
924 bool_val = (c == '+');
925 arg++;
926 }
927
928 const char* name = arg;
929 while (true) {
930 c = *arg;
931 if (isalnum(c) || (c == '_')) {
932 ++arg;
933 } else {
934 break;
935 }
936 }
937
938 size_t name_len = size_t(arg - name);
939 if (name_len == 0) {
940 return false;
941 }
942
943 JVMFlag* flag = find_jvm_flag(name, name_len);
944 if (flag == nullptr) {
945 return false;
946 }
947
948 if (is_bool) {
949 if (*arg != 0) {
950 // Error -- extra characters such as -XX:+BoolFlag=123
951 return false;
952 }
953 return set_bool_flag(flag, bool_val, origin);
954 }
955
956 if (arg[0] == '=') {
957 const char* value = arg + 1;
958 if (flag->is_ccstr()) {
959 if (flag->ccstr_accumulates()) {
960 return append_to_string_flag(flag, value, origin);
961 } else {
962 return set_string_flag(flag, value, origin);
963 }
964 } else if (flag->is_double()) {
965 return set_fp_numeric_flag(flag, value, origin);
966 } else {
967 return set_numeric_flag(flag, value, origin);
968 }
969 }
970
971 if (arg[0] == ':' && arg[1] == '=') {
972 // -XX:Foo:=xxx will reset the string flag to the given value.
973 const char* value = arg + 2;
974 return set_string_flag(flag, value, origin);
975 }
976
977 return false;
978 }
979
980 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
981 assert(bldarray != nullptr, "illegal argument");
982
983 if (arg == nullptr) {
984 return;
985 }
986
987 int new_count = *count + 1;
988
989 // expand the array and add arg to the last element
990 if (*bldarray == nullptr) {
991 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
992 } else {
993 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
994 }
995 (*bldarray)[*count] = os::strdup_check_oom(arg);
996 *count = new_count;
997 }
998
999 void Arguments::build_jvm_args(const char* arg) {
1000 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1001 }
1002
1003 void Arguments::build_jvm_flags(const char* arg) {
1004 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1005 }
1006
1007 // utility function to return a string that concatenates all
1008 // strings in a given char** array
1009 const char* Arguments::build_resource_string(char** args, int count) {
1010 if (args == nullptr || count == 0) {
1011 return nullptr;
1012 }
1013 size_t length = 0;
1014 for (int i = 0; i < count; i++) {
1015 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1016 }
1017 char* s = NEW_RESOURCE_ARRAY(char, length);
1018 char* dst = s;
1019 for (int j = 0; j < count; j++) {
1020 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1021 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1022 dst += offset;
1023 length -= offset;
1024 }
1025 return (const char*) s;
1026 }
1027
1028 void Arguments::print_on(outputStream* st) {
1029 st->print_cr("VM Arguments:");
1030 if (num_jvm_flags() > 0) {
1031 st->print("jvm_flags: "); print_jvm_flags_on(st);
1032 st->cr();
1033 }
1034 if (num_jvm_args() > 0) {
1035 st->print("jvm_args: "); print_jvm_args_on(st);
1036 st->cr();
1037 }
1038 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1039 if (_java_class_path != nullptr) {
1040 char* path = _java_class_path->value();
1041 size_t len = strlen(path);
1042 st->print("java_class_path (initial): ");
1043 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1044 if (len == 0) {
1045 st->print_raw_cr("<not set>");
1046 } else {
1047 st->print_raw_cr(path, len);
1048 }
1049 }
1050 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1051 }
1052
1053 void Arguments::print_summary_on(outputStream* st) {
1054 // Print the command line. Environment variables that are helpful for
1055 // reproducing the problem are written later in the hs_err file.
1056 // flags are from setting file
1057 if (num_jvm_flags() > 0) {
1058 st->print_raw("Settings File: ");
1059 print_jvm_flags_on(st);
1060 st->cr();
1061 }
1062 // args are the command line and environment variable arguments.
1063 st->print_raw("Command Line: ");
1064 if (num_jvm_args() > 0) {
1065 print_jvm_args_on(st);
1066 }
1067 // this is the classfile and any arguments to the java program
1068 if (java_command() != nullptr) {
1069 st->print("%s", java_command());
1070 }
1071 st->cr();
1072 }
1073
1074 void Arguments::print_jvm_flags_on(outputStream* st) {
1075 if (_num_jvm_flags > 0) {
1076 for (int i=0; i < _num_jvm_flags; i++) {
1077 st->print("%s ", _jvm_flags_array[i]);
1078 }
1079 }
1080 }
1081
1082 void Arguments::print_jvm_args_on(outputStream* st) {
1083 if (_num_jvm_args > 0) {
1084 for (int i=0; i < _num_jvm_args; i++) {
1085 st->print("%s ", _jvm_args_array[i]);
1086 }
1087 }
1088 }
1089
1090 bool Arguments::process_argument(const char* arg,
1091 jboolean ignore_unrecognized,
1092 JVMFlagOrigin origin) {
1093 JDK_Version since = JDK_Version();
1094
1095 if (parse_argument(arg, origin)) {
1096 return true;
1097 }
1098
1099 // Determine if the flag has '+', '-', or '=' characters.
1100 bool has_plus_minus = (*arg == '+' || *arg == '-');
1101 const char* const argname = has_plus_minus ? arg + 1 : arg;
1102
1103 size_t arg_len;
1104 const char* equal_sign = strchr(argname, '=');
1105 if (equal_sign == nullptr) {
1106 arg_len = strlen(argname);
1107 } else {
1108 arg_len = equal_sign - argname;
1109 }
1110
1111 // Only make the obsolete check for valid arguments.
1112 if (arg_len <= BUFLEN) {
1113 // Construct a string which consists only of the argument name without '+', '-', or '='.
1114 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1115 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1116 if (is_obsolete_flag(stripped_argname, &since)) {
1117 char version[256];
1118 since.to_string(version, sizeof(version));
1119 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1120 return true;
1121 }
1122 }
1123
1124 // For locked flags, report a custom error message if available.
1125 // Otherwise, report the standard unrecognized VM option.
1126 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1127 if (found_flag != nullptr) {
1128 char locked_message_buf[BUFLEN];
1129 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1130 if (strlen(locked_message_buf) == 0) {
1131 if (found_flag->is_bool() && !has_plus_minus) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "Missing +/- setting for VM option '%s'\n", argname);
1134 } else if (!found_flag->is_bool() && has_plus_minus) {
1135 jio_fprintf(defaultStream::error_stream(),
1136 "Unexpected +/- setting in VM option '%s'\n", argname);
1137 } else {
1138 jio_fprintf(defaultStream::error_stream(),
1139 "Improperly specified VM option '%s'\n", argname);
1140 }
1141 } else {
1142 #ifdef PRODUCT
1143 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1144 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1145 if (ignore_unrecognized && mismatched) {
1146 return true;
1147 }
1148 #endif
1149 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1150 }
1151 } else {
1152 if (ignore_unrecognized) {
1153 return true;
1154 }
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Unrecognized VM option '%s'\n", argname);
1157 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1158 if (fuzzy_matched != nullptr) {
1159 jio_fprintf(defaultStream::error_stream(),
1160 "Did you mean '%s%s%s'?\n",
1161 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1162 fuzzy_matched->name(),
1163 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1164 }
1165 }
1166
1167 // allow for commandline "commenting out" options like -XX:#+Verbose
1168 return arg[0] == '#';
1169 }
1170
1171 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1172 FILE* stream = os::fopen(file_name, "rb");
1173 if (stream == nullptr) {
1174 if (should_exist) {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Could not open settings file %s\n", file_name);
1177 return false;
1178 } else {
1179 return true;
1180 }
1181 }
1182
1183 char token[1024];
1184 int pos = 0;
1185
1186 bool in_white_space = true;
1187 bool in_comment = false;
1188 bool in_quote = false;
1189 int quote_c = 0;
1190 bool result = true;
1191
1192 int c = getc(stream);
1193 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1194 if (in_white_space) {
1195 if (in_comment) {
1196 if (c == '\n') in_comment = false;
1197 } else {
1198 if (c == '#') in_comment = true;
1199 else if (!isspace(c)) {
1200 in_white_space = false;
1201 token[pos++] = checked_cast<char>(c);
1202 }
1203 }
1204 } else {
1205 if (c == '\n' || (!in_quote && isspace(c))) {
1206 // token ends at newline, or at unquoted whitespace
1207 // this allows a way to include spaces in string-valued options
1208 token[pos] = '\0';
1209 logOption(token);
1210 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1211 build_jvm_flags(token);
1212 pos = 0;
1213 in_white_space = true;
1214 in_quote = false;
1215 } else if (!in_quote && (c == '\'' || c == '"')) {
1216 in_quote = true;
1217 quote_c = c;
1218 } else if (in_quote && (c == quote_c)) {
1219 in_quote = false;
1220 } else {
1221 token[pos++] = checked_cast<char>(c);
1222 }
1223 }
1224 c = getc(stream);
1225 }
1226 if (pos > 0) {
1227 token[pos] = '\0';
1228 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1229 build_jvm_flags(token);
1230 }
1231 fclose(stream);
1232 return result;
1233 }
1234
1235 //=============================================================================================================
1236 // Parsing of properties (-D)
1237
1238 const char* Arguments::get_property(const char* key) {
1239 return PropertyList_get_value(system_properties(), key);
1240 }
1241
1242 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1243 const char* eq = strchr(prop, '=');
1244 const char* key;
1245 const char* value = "";
1246
1247 if (eq == nullptr) {
1248 // property doesn't have a value, thus use passed string
1249 key = prop;
1250 } else {
1251 // property have a value, thus extract it and save to the
1252 // allocated string
1253 size_t key_len = eq - prop;
1254 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1255
1256 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1257 key = tmp_key;
1258
1259 value = &prop[key_len + 1];
1260 }
1261
1262 CDSConfig::check_system_property(key, value);
1263
1264 if (strcmp(key, "java.compiler") == 0) {
1265 // we no longer support java.compiler system property, log a warning and let it get
1266 // passed to Java, like any other system property
1267 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1268 // for applications using NONE or empty value, log a more informative message
1269 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1270 } else {
1271 warning("The java.compiler system property is obsolete and no longer supported.");
1272 }
1273 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1274 // sun.java.launcher.is_altjvm property is
1275 // private and is processed in process_sun_java_launcher_properties();
1276 // the sun.java.launcher property is passed on to the java application
1277 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1278 // append is true, writable is true, internal is false
1279 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1280 WriteableProperty, ExternalProperty);
1281 } else {
1282 if (strcmp(key, "sun.java.command") == 0) {
1283 char *old_java_command = _java_command;
1284 _java_command = os::strdup_check_oom(value, mtArguments);
1285 if (old_java_command != nullptr) {
1286 os::free(old_java_command);
1287 }
1288 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1289 // If this property is set on the command line then its value will be
1290 // displayed in VM error logs as the URL at which to submit such logs.
1291 // Normally the URL displayed in error logs is different from the value
1292 // of this system property, so a different property should have been
1293 // used here, but we leave this as-is in case someone depends upon it.
1294 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1295 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1296 // its value without going through the property list or making a Java call.
1297 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1298 if (old_java_vendor_url_bug != nullptr) {
1299 os::free((void *)old_java_vendor_url_bug);
1300 }
1301 }
1302
1303 // Create new property and add at the end of the list
1304 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1305 }
1306
1307 if (key != prop) {
1308 // SystemProperty copy passed value, thus free previously allocated
1309 // memory
1310 FreeHeap((void *)key);
1311 }
1312
1313 return true;
1314 }
1315
1316 //===========================================================================================================
1317 // Setting int/mixed/comp mode flags
1318
1319 void Arguments::set_mode_flags(Mode mode) {
1320 // Set up default values for all flags.
1321 // If you add a flag to any of the branches below,
1322 // add a default value for it here.
1323 _mode = mode;
1324
1325 // Ensure Agent_OnLoad has the correct initial values.
1326 // This may not be the final mode; mode may change later in onload phase.
1327 PropertyList_unique_add(&_system_properties, "java.vm.info",
1328 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1329
1330 UseInterpreter = true;
1331 UseCompiler = true;
1332 UseLoopCounter = true;
1333
1334 // Default values may be platform/compiler dependent -
1335 // use the saved values
1336 ClipInlining = Arguments::_ClipInlining;
1337 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1338 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1339 BackgroundCompilation = Arguments::_BackgroundCompilation;
1340
1341 // Change from defaults based on mode
1342 switch (mode) {
1343 default:
1344 ShouldNotReachHere();
1345 break;
1346 case _int:
1347 UseCompiler = false;
1348 UseLoopCounter = false;
1349 AlwaysCompileLoopMethods = false;
1350 UseOnStackReplacement = false;
1351 break;
1352 case _mixed:
1353 // same as default
1354 break;
1355 case _comp:
1356 UseInterpreter = false;
1357 BackgroundCompilation = false;
1358 ClipInlining = false;
1359 break;
1360 }
1361 }
1362
1363 // Conflict: required to use shared spaces (-Xshare:on), but
1364 // incompatible command line options were chosen.
1365 void Arguments::no_shared_spaces(const char* message) {
1366 if (RequireSharedSpaces) {
1367 jio_fprintf(defaultStream::error_stream(),
1368 "Class data sharing is inconsistent with other specified options.\n");
1369 vm_exit_during_initialization("Unable to use shared archive", message);
1370 } else {
1371 log_info(cds)("Unable to use shared archive: %s", message);
1372 UseSharedSpaces = false;
1373 }
1374 }
1375
1376 void set_object_alignment() {
1377 // Object alignment.
1378 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1379 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1380 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1381 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1382 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1383 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1384
1385 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1386 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1387
1388 // Oop encoding heap max
1389 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1390 }
1391
1392 size_t Arguments::max_heap_for_compressed_oops() {
1393 // Avoid sign flip.
1394 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1395 // We need to fit both the null page and the heap into the memory budget, while
1396 // keeping alignment constraints of the heap. To guarantee the latter, as the
1397 // null page is located before the heap, we pad the null page to the conservative
1398 // maximum alignment that the GC may ever impose upon the heap.
1399 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1400 _conservative_max_heap_alignment);
1401
1402 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1403 NOT_LP64(ShouldNotReachHere(); return 0);
1404 }
1405
1406 void Arguments::set_use_compressed_oops() {
1407 #ifdef _LP64
1408 // MaxHeapSize is not set up properly at this point, but
1409 // the only value that can override MaxHeapSize if we are
1410 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1411 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1412
1413 if (max_heap_size <= max_heap_for_compressed_oops()) {
1414 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1415 FLAG_SET_ERGO(UseCompressedOops, true);
1416 }
1417 } else {
1418 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1419 warning("Max heap size too large for Compressed Oops");
1420 FLAG_SET_DEFAULT(UseCompressedOops, false);
1421 }
1422 }
1423 #endif // _LP64
1424 }
1425
1426 void Arguments::set_use_compressed_klass_ptrs() {
1427 #ifdef _LP64
1428 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1429 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1430 #endif // _LP64
1431 }
1432
1433 void Arguments::set_conservative_max_heap_alignment() {
1434 // The conservative maximum required alignment for the heap is the maximum of
1435 // the alignments imposed by several sources: any requirements from the heap
1436 // itself and the maximum page size we may run the VM with.
1437 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1438 _conservative_max_heap_alignment = MAX4(heap_alignment,
1439 os::vm_allocation_granularity(),
1440 os::max_page_size(),
1441 GCArguments::compute_heap_alignment());
1442 }
1443
1444 jint Arguments::set_ergonomics_flags() {
1445 GCConfig::initialize();
1446
1447 set_conservative_max_heap_alignment();
1448
1449 #ifdef _LP64
1450 set_use_compressed_oops();
1451 set_use_compressed_klass_ptrs();
1452
1453 // Also checks that certain machines are slower with compressed oops
1454 // in vm_version initialization code.
1455 #endif // _LP64
1456
1457 return JNI_OK;
1458 }
1459
1460 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1461 size_t max_allocatable;
1462 size_t result = limit;
1463 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1464 // The AggressiveHeap check is a temporary workaround to avoid calling
1465 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1466 // selected. This works because AggressiveHeap implies UseParallelGC
1467 // where we know the ratio will be 1. Once the AggressiveHeap option is
1468 // removed, this can be cleaned up.
1469 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1470 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1471 result = MIN2(result, max_allocatable / fraction);
1472 }
1473 return result;
1474 }
1475
1476 // Use static initialization to get the default before parsing
1477 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1478
1479 void Arguments::set_heap_size() {
1480 julong phys_mem;
1481
1482 // If the user specified one of these options, they
1483 // want specific memory sizing so do not limit memory
1484 // based on compressed oops addressability.
1485 // Also, memory limits will be calculated based on
1486 // available os physical memory, not our MaxRAM limit,
1487 // unless MaxRAM is also specified.
1488 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1489 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1490 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1491 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1492 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1493 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
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
1508 // Convert deprecated flags
1509 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1510 !FLAG_IS_DEFAULT(MaxRAMFraction))
1511 MaxRAMPercentage = 100.0 / (double)MaxRAMFraction;
1512
1513 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1514 !FLAG_IS_DEFAULT(MinRAMFraction))
1515 MinRAMPercentage = 100.0 / (double)MinRAMFraction;
1516
1517 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1518 !FLAG_IS_DEFAULT(InitialRAMFraction))
1519 InitialRAMPercentage = 100.0 / (double)InitialRAMFraction;
1520
1521 // If the maximum heap size has not been set with -Xmx,
1522 // then set it as fraction of the size of physical memory,
1523 // respecting the maximum and minimum sizes of the heap.
1524 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1525 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1526 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1527 if (reasonable_min < MaxHeapSize) {
1528 // Small physical memory, so use a minimum fraction of it for the heap
1529 reasonable_max = reasonable_min;
1530 } else {
1531 // Not-small physical memory, so require a heap at least
1532 // as large as MaxHeapSize
1533 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1534 }
1535
1536 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1537 // Limit the heap size to ErgoHeapSizeLimit
1538 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1539 }
1540
1541 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1542
1543 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1544 // An initial heap size was specified on the command line,
1545 // so be sure that the maximum size is consistent. Done
1546 // after call to limit_heap_by_allocatable_memory because that
1547 // method might reduce the allocation size.
1548 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1549 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1550 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1551 }
1552
1553 #ifdef _LP64
1554 if (UseCompressedOops || UseCompressedClassPointers) {
1555 // HeapBaseMinAddress can be greater than default but not less than.
1556 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1557 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1558 // matches compressed oops printing flags
1559 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1560 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1561 DefaultHeapBaseMinAddress,
1562 DefaultHeapBaseMinAddress/G,
1563 HeapBaseMinAddress);
1564 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1565 }
1566 }
1567 }
1568 if (UseCompressedOops) {
1569 // Limit the heap size to the maximum possible when using compressed oops
1570 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1571
1572 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1573 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1574 // but it should be not less than default MaxHeapSize.
1575 max_coop_heap -= HeapBaseMinAddress;
1576 }
1577
1578 // If user specified flags prioritizing os physical
1579 // memory limits, then disable compressed oops if
1580 // limits exceed max_coop_heap and UseCompressedOops
1581 // was not specified.
1582 if (reasonable_max > max_coop_heap) {
1583 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1584 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1585 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1586 "Please check the setting of MaxRAMPercentage %5.2f."
1587 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1588 FLAG_SET_ERGO(UseCompressedOops, false);
1589 } else {
1590 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1591 }
1592 }
1593 }
1594 #endif // _LP64
1595
1596 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1597 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1598 }
1599
1600 // If the minimum or initial heap_size have not been set or requested to be set
1601 // ergonomically, set them accordingly.
1602 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1603 julong reasonable_minimum = (julong)(OldSize + NewSize);
1604
1605 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1606
1607 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1608
1609 if (InitialHeapSize == 0) {
1610 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1611 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1612
1613 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1614 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1615
1616 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1617 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1618 }
1619 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1620 // synchronize with InitialHeapSize to avoid errors with the default value.
1621 if (MinHeapSize == 0) {
1622 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1623 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1624 }
1625 }
1626 }
1627
1628 // This option inspects the machine and attempts to set various
1629 // parameters to be optimal for long-running, memory allocation
1630 // intensive jobs. It is intended for machines with large
1631 // amounts of cpu and memory.
1632 jint Arguments::set_aggressive_heap_flags() {
1633 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1634 // VM, but we may not be able to represent the total physical memory
1635 // available (like having 8gb of memory on a box but using a 32bit VM).
1636 // Thus, we need to make sure we're using a julong for intermediate
1637 // calculations.
1638 julong initHeapSize;
1639 julong total_memory = os::physical_memory();
1640
1641 if (total_memory < (julong) 256 * M) {
1642 jio_fprintf(defaultStream::error_stream(),
1643 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1644 vm_exit(1);
1645 }
1646
1647 // The heap size is half of available memory, or (at most)
1648 // all of possible memory less 160mb (leaving room for the OS
1649 // when using ISM). This is the maximum; because adaptive sizing
1650 // is turned on below, the actual space used may be smaller.
1651
1652 initHeapSize = MIN2(total_memory / (julong) 2,
1653 total_memory - (julong) 160 * M);
1654
1655 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1656
1657 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1658 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1659 return JNI_EINVAL;
1660 }
1661 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1662 return JNI_EINVAL;
1663 }
1664 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1665 return JNI_EINVAL;
1666 }
1667 }
1668 if (FLAG_IS_DEFAULT(NewSize)) {
1669 // Make the young generation 3/8ths of the total heap.
1670 if (FLAG_SET_CMDLINE(NewSize,
1671 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1672 return JNI_EINVAL;
1673 }
1674 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1675 return JNI_EINVAL;
1676 }
1677 }
1678
1679 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1680 FLAG_SET_DEFAULT(UseLargePages, true);
1681 #endif
1682
1683 // Increase some data structure sizes for efficiency
1684 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1685 return JNI_EINVAL;
1686 }
1687 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1688 return JNI_EINVAL;
1689 }
1690 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1691 return JNI_EINVAL;
1692 }
1693
1694 // See the OldPLABSize comment below, but replace 'after promotion'
1695 // with 'after copying'. YoungPLABSize is the size of the survivor
1696 // space per-gc-thread buffers. The default is 4kw.
1697 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1698 return JNI_EINVAL;
1699 }
1700
1701 // OldPLABSize is the size of the buffers in the old gen that
1702 // UseParallelGC uses to promote live data that doesn't fit in the
1703 // survivor spaces. At any given time, there's one for each gc thread.
1704 // The default size is 1kw. These buffers are rarely used, since the
1705 // survivor spaces are usually big enough. For specjbb, however, there
1706 // are occasions when there's lots of live data in the young gen
1707 // and we end up promoting some of it. We don't have a definite
1708 // explanation for why bumping OldPLABSize helps, but the theory
1709 // is that a bigger PLAB results in retaining something like the
1710 // original allocation order after promotion, which improves mutator
1711 // locality. A minor effect may be that larger PLABs reduce the
1712 // number of PLAB allocation events during gc. The value of 8kw
1713 // was arrived at by experimenting with specjbb.
1714 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1715 return JNI_EINVAL;
1716 }
1717
1718 // Enable parallel GC and adaptive generation sizing
1719 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1720 return JNI_EINVAL;
1721 }
1722
1723 // Encourage steady state memory management
1724 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1725 return JNI_EINVAL;
1726 }
1727
1728 // This appears to improve mutator locality
1729 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1730 return JNI_EINVAL;
1731 }
1732
1733 return JNI_OK;
1734 }
1735
1736 // This must be called after ergonomics.
1737 void Arguments::set_bytecode_flags() {
1738 if (!RewriteBytecodes) {
1739 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1740 }
1741 }
1742
1743 // Aggressive optimization flags
1744 jint Arguments::set_aggressive_opts_flags() {
1745 #ifdef COMPILER2
1746 if (AggressiveUnboxing) {
1747 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1748 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1749 } else if (!EliminateAutoBox) {
1750 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1751 AggressiveUnboxing = false;
1752 }
1753 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1754 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1755 } else if (!DoEscapeAnalysis) {
1756 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1757 AggressiveUnboxing = false;
1758 }
1759 }
1760 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1761 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1762 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1763 }
1764 // Feed the cache size setting into the JDK
1765 char buffer[1024];
1766 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1767 if (!add_property(buffer)) {
1768 return JNI_ENOMEM;
1769 }
1770 }
1771 #endif
1772
1773 return JNI_OK;
1774 }
1775
1776 //===========================================================================================================
1777
1778 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1779 if (_sun_java_launcher != _default_java_launcher) {
1780 os::free(const_cast<char*>(_sun_java_launcher));
1781 }
1782 _sun_java_launcher = os::strdup_check_oom(launcher);
1783 }
1784
1785 bool Arguments::created_by_java_launcher() {
1786 assert(_sun_java_launcher != nullptr, "property must have value");
1787 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1788 }
1789
1790 bool Arguments::sun_java_launcher_is_altjvm() {
1791 return _sun_java_launcher_is_altjvm;
1792 }
1793
1794 //===========================================================================================================
1795 // Parsing of main arguments
1796
1797 unsigned int addreads_count = 0;
1798 unsigned int addexports_count = 0;
1799 unsigned int addopens_count = 0;
1800 unsigned int addmods_count = 0;
1801 unsigned int patch_mod_count = 0;
1802 unsigned int enable_native_access_count = 0;
1803
1804 // Check the consistency of vm_init_args
1805 bool Arguments::check_vm_args_consistency() {
1806 // Method for adding checks for flag consistency.
1807 // The intent is to warn the user of all possible conflicts,
1808 // before returning an error.
1809 // Note: Needs platform-dependent factoring.
1810 bool status = true;
1811
1812 if (TLABRefillWasteFraction == 0) {
1813 jio_fprintf(defaultStream::error_stream(),
1814 "TLABRefillWasteFraction should be a denominator, "
1815 "not " SIZE_FORMAT "\n",
1816 TLABRefillWasteFraction);
1817 status = false;
1818 }
1819
1820 status = CompilerConfig::check_args_consistency(status);
1821 #if INCLUDE_JVMCI
1822 if (status && EnableJVMCI) {
1823 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1824 AddProperty, UnwriteableProperty, InternalProperty);
1825 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1826 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1827 return false;
1828 }
1829 }
1830 }
1831 #endif
1832
1833 #if INCLUDE_JFR
1834 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1835 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1836 return false;
1837 }
1838 }
1839 #endif
1840
1841 #ifndef SUPPORT_RESERVED_STACK_AREA
1842 if (StackReservedPages != 0) {
1843 FLAG_SET_CMDLINE(StackReservedPages, 0);
1844 warning("Reserved Stack Area not supported on this platform");
1845 }
1846 #endif
1847
1848 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1849 if (LockingMode == LM_LIGHTWEIGHT) {
1850 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1851 warning("New lightweight locking not supported on this platform");
1852 }
1853 #endif
1854
1855 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1856 if (LockingMode == LM_MONITOR) {
1857 jio_fprintf(defaultStream::error_stream(),
1858 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1859 return false;
1860 }
1861 #endif
1862 #if defined(X86) && !defined(ZERO)
1863 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1864 jio_fprintf(defaultStream::error_stream(),
1865 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n");
1866
1867 return false;
1868 }
1869 #endif
1870 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1871 jio_fprintf(defaultStream::error_stream(),
1872 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1873 return false;
1874 }
1875 return status;
1876 }
1877
1878 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1879 const char* option_type) {
1880 if (ignore) return false;
1881
1882 const char* spacer = " ";
1883 if (option_type == nullptr) {
1884 option_type = ++spacer; // Set both to the empty string.
1885 }
1886
1887 jio_fprintf(defaultStream::error_stream(),
1888 "Unrecognized %s%soption: %s\n", option_type, spacer,
1889 option->optionString);
1890 return true;
1891 }
1892
1893 static const char* user_assertion_options[] = {
1894 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1895 };
1896
1897 static const char* system_assertion_options[] = {
1898 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1899 };
1900
1901 bool Arguments::parse_uint(const char* value,
1902 uint* uint_arg,
1903 uint min_size) {
1904 uint n;
1905 if (!parse_integer(value, &n)) {
1906 return false;
1907 }
1908 if (n >= min_size) {
1909 *uint_arg = n;
1910 return true;
1911 } else {
1912 return false;
1913 }
1914 }
1915
1916 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1917 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1918 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1919 char* property = AllocateHeap(prop_len, mtArguments);
1920 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1921 if (ret < 0 || ret >= (int)prop_len) {
1922 FreeHeap(property);
1923 return false;
1924 }
1925 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1926 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1927 // that multiple occurrences of the associated flag just causes the existing property value to be
1928 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1929 // to a property after we have finished flag processing.
1930 bool added = add_property(property, WriteableProperty, internal);
1931 FreeHeap(property);
1932 return added;
1933 }
1934
1935 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1936 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1937 const unsigned int props_count_limit = 1000;
1938 const int max_digits = 3;
1939 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1940
1941 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1942 if (count < props_count_limit) {
1943 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1944 char* property = AllocateHeap(prop_len, mtArguments);
1945 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1946 if (ret < 0 || ret >= (int)prop_len) {
1947 FreeHeap(property);
1948 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1949 return false;
1950 }
1951 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1952 FreeHeap(property);
1953 return added;
1954 }
1955
1956 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1957 return false;
1958 }
1959
1960 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1961 julong* long_arg,
1962 julong min_size,
1963 julong max_size) {
1964 if (!parse_integer(s, long_arg)) return arg_unreadable;
1965 return check_memory_size(*long_arg, min_size, max_size);
1966 }
1967
1968 // Parse JavaVMInitArgs structure
1969
1970 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1971 const JavaVMInitArgs *java_tool_options_args,
1972 const JavaVMInitArgs *java_options_args,
1973 const JavaVMInitArgs *cmd_line_args) {
1974 bool patch_mod_javabase = false;
1975
1976 // Save default settings for some mode flags
1977 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1978 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1979 Arguments::_ClipInlining = ClipInlining;
1980 Arguments::_BackgroundCompilation = BackgroundCompilation;
1981
1982 // Remember the default value of SharedBaseAddress.
1983 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1984
1985 // Setup flags for mixed which is the default
1986 set_mode_flags(_mixed);
1987
1988 // Parse args structure generated from java.base vm options resource
1989 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1990 if (result != JNI_OK) {
1991 return result;
1992 }
1993
1994 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1995 // variable (if present).
1996 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1997 if (result != JNI_OK) {
1998 return result;
1999 }
2000
2001 // Parse args structure generated from the command line flags.
2002 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2003 if (result != JNI_OK) {
2004 return result;
2005 }
2006
2007 // Parse args structure generated from the _JAVA_OPTIONS environment
2008 // variable (if present) (mimics classic VM)
2009 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2010 if (result != JNI_OK) {
2011 return result;
2012 }
2013
2014 // Disable CDS for exploded image
2015 if (!has_jimage()) {
2016 no_shared_spaces("CDS disabled on exploded JDK");
2017 }
2018
2019 // We need to ensure processor and memory resources have been properly
2020 // configured - which may rely on arguments we just processed - before
2021 // doing the final argument processing. Any argument processing that
2022 // needs to know about processor and memory resources must occur after
2023 // this point.
2024
2025 os::init_container_support();
2026
2027 SystemMemoryBarrier::initialize();
2028
2029 // Do final processing now that all arguments have been parsed
2030 result = finalize_vm_init_args(patch_mod_javabase);
2031 if (result != JNI_OK) {
2032 return result;
2033 }
2034
2035 return JNI_OK;
2036 }
2037
2038 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2039 // represents a valid JDWP agent. is_path==true denotes that we
2040 // are dealing with -agentpath (case where name is a path), otherwise with
2041 // -agentlib
2042 bool valid_jdwp_agent(char *name, bool is_path) {
2043 char *_name;
2044 const char *_jdwp = "jdwp";
2045 size_t _len_jdwp, _len_prefix;
2046
2047 if (is_path) {
2048 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2049 return false;
2050 }
2051
2052 _name++; // skip past last path separator
2053 _len_prefix = strlen(JNI_LIB_PREFIX);
2054
2055 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2056 return false;
2057 }
2058
2059 _name += _len_prefix;
2060 _len_jdwp = strlen(_jdwp);
2061
2062 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2063 _name += _len_jdwp;
2064 }
2065 else {
2066 return false;
2067 }
2068
2069 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2070 return false;
2071 }
2072
2073 return true;
2074 }
2075
2076 if (strcmp(name, _jdwp) == 0) {
2077 return true;
2078 }
2079
2080 return false;
2081 }
2082
2083 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2084 // --patch-module=<module>=<file>(<pathsep><file>)*
2085 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2086 // Find the equal sign between the module name and the path specification
2087 const char* module_equal = strchr(patch_mod_tail, '=');
2088 if (module_equal == nullptr) {
2089 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2090 return JNI_ERR;
2091 } else {
2092 // Pick out the module name
2093 size_t module_len = module_equal - patch_mod_tail;
2094 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2095 if (module_name != nullptr) {
2096 memcpy(module_name, patch_mod_tail, module_len);
2097 *(module_name + module_len) = '\0';
2098 // The path piece begins one past the module_equal sign
2099 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2100 FREE_C_HEAP_ARRAY(char, module_name);
2101 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2102 return JNI_ENOMEM;
2103 }
2104 } else {
2105 return JNI_ENOMEM;
2106 }
2107 }
2108 return JNI_OK;
2109 }
2110
2111 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2112 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2113 // The min and max sizes match the values in globals.hpp, but scaled
2114 // with K. The values have been chosen so that alignment with page
2115 // size doesn't change the max value, which makes the conversions
2116 // back and forth between Xss value and ThreadStackSize value easier.
2117 // The values have also been chosen to fit inside a 32-bit signed type.
2118 const julong min_ThreadStackSize = 0;
2119 const julong max_ThreadStackSize = 1 * M;
2120
2121 // Make sure the above values match the range set in globals.hpp
2122 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2123 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2124 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2125
2126 const julong min_size = min_ThreadStackSize * K;
2127 const julong max_size = max_ThreadStackSize * K;
2128
2129 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2130
2131 julong size = 0;
2132 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2133 if (errcode != arg_in_range) {
2134 bool silent = (option == nullptr); // Allow testing to silence error messages
2135 if (!silent) {
2136 jio_fprintf(defaultStream::error_stream(),
2137 "Invalid thread stack size: %s\n", option->optionString);
2138 describe_range_error(errcode);
2139 }
2140 return JNI_EINVAL;
2141 }
2142
2143 // Internally track ThreadStackSize in units of 1024 bytes.
2144 const julong size_aligned = align_up(size, K);
2145 assert(size <= size_aligned,
2146 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2147 size, size_aligned);
2148
2149 const julong size_in_K = size_aligned / K;
2150 assert(size_in_K < (julong)max_intx,
2151 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2152 size_in_K);
2153
2154 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2155 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2156 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2157 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2158 max_expanded, size_in_K);
2159
2160 *out_ThreadStackSize = (intx)size_in_K;
2161
2162 return JNI_OK;
2163 }
2164
2165 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2166 // For match_option to return remaining or value part of option string
2167 const char* tail;
2168
2169 // iterate over arguments
2170 for (int index = 0; index < args->nOptions; index++) {
2171 bool is_absolute_path = false; // for -agentpath vs -agentlib
2172
2173 const JavaVMOption* option = args->options + index;
2174
2175 if (!match_option(option, "-Djava.class.path", &tail) &&
2176 !match_option(option, "-Dsun.java.command", &tail) &&
2177 !match_option(option, "-Dsun.java.launcher", &tail)) {
2178
2179 // add all jvm options to the jvm_args string. This string
2180 // is used later to set the java.vm.args PerfData string constant.
2181 // the -Djava.class.path and the -Dsun.java.command options are
2182 // omitted from jvm_args string as each have their own PerfData
2183 // string constant object.
2184 build_jvm_args(option->optionString);
2185 }
2186
2187 // -verbose:[class/module/gc/jni]
2188 if (match_option(option, "-verbose", &tail)) {
2189 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2190 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2191 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2192 } else if (!strcmp(tail, ":module")) {
2193 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2194 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2195 } else if (!strcmp(tail, ":gc")) {
2196 if (_legacyGCLogging.lastFlag == 0) {
2197 _legacyGCLogging.lastFlag = 1;
2198 }
2199 } else if (!strcmp(tail, ":jni")) {
2200 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2201 }
2202 // -da / -ea / -disableassertions / -enableassertions
2203 // These accept an optional class/package name separated by a colon, e.g.,
2204 // -da:java.lang.Thread.
2205 } else if (match_option(option, user_assertion_options, &tail, true)) {
2206 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2207 if (*tail == '\0') {
2208 JavaAssertions::setUserClassDefault(enable);
2209 } else {
2210 assert(*tail == ':', "bogus match by match_option()");
2211 JavaAssertions::addOption(tail + 1, enable);
2212 }
2213 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2214 } else if (match_option(option, system_assertion_options, &tail, false)) {
2215 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2216 JavaAssertions::setSystemClassDefault(enable);
2217 // -bootclasspath:
2218 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2219 jio_fprintf(defaultStream::output_stream(),
2220 "-Xbootclasspath is no longer a supported option.\n");
2221 return JNI_EINVAL;
2222 // -bootclasspath/a:
2223 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2224 Arguments::append_sysclasspath(tail);
2225 #if INCLUDE_CDS
2226 MetaspaceShared::disable_optimized_module_handling();
2227 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2228 #endif
2229 // -bootclasspath/p:
2230 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2231 jio_fprintf(defaultStream::output_stream(),
2232 "-Xbootclasspath/p is no longer a supported option.\n");
2233 return JNI_EINVAL;
2234 // -Xrun
2235 } else if (match_option(option, "-Xrun", &tail)) {
2236 if (tail != nullptr) {
2237 const char* pos = strchr(tail, ':');
2238 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2239 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2240 jio_snprintf(name, len + 1, "%s", tail);
2241
2242 char *options = nullptr;
2243 if(pos != nullptr) {
2244 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2245 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2246 }
2247 #if !INCLUDE_JVMTI
2248 if (strcmp(name, "jdwp") == 0) {
2249 jio_fprintf(defaultStream::error_stream(),
2250 "Debugging agents are not supported in this VM\n");
2251 return JNI_ERR;
2252 }
2253 #endif // !INCLUDE_JVMTI
2254 JvmtiAgentList::add_xrun(name, options, false);
2255 FREE_C_HEAP_ARRAY(char, name);
2256 FREE_C_HEAP_ARRAY(char, options);
2257 }
2258 } else if (match_option(option, "--add-reads=", &tail)) {
2259 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2260 return JNI_ENOMEM;
2261 }
2262 } else if (match_option(option, "--add-exports=", &tail)) {
2263 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2264 return JNI_ENOMEM;
2265 }
2266 } else if (match_option(option, "--add-opens=", &tail)) {
2267 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2268 return JNI_ENOMEM;
2269 }
2270 } else if (match_option(option, "--add-modules=", &tail)) {
2271 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2272 return JNI_ENOMEM;
2273 }
2274 } else if (match_option(option, "--enable-native-access=", &tail)) {
2275 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2276 return JNI_ENOMEM;
2277 }
2278 } else if (match_option(option, "--limit-modules=", &tail)) {
2279 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2280 return JNI_ENOMEM;
2281 }
2282 } else if (match_option(option, "--module-path=", &tail)) {
2283 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2284 return JNI_ENOMEM;
2285 }
2286 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2287 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2288 return JNI_ENOMEM;
2289 }
2290 } else if (match_option(option, "--patch-module=", &tail)) {
2291 // --patch-module=<module>=<file>(<pathsep><file>)*
2292 int res = process_patch_mod_option(tail, patch_mod_javabase);
2293 if (res != JNI_OK) {
2294 return res;
2295 }
2296 } else if (match_option(option, "--illegal-access=", &tail)) {
2297 char version[256];
2298 JDK_Version::jdk(17).to_string(version, sizeof(version));
2299 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2300 // -agentlib and -agentpath
2301 } else if (match_option(option, "-agentlib:", &tail) ||
2302 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2303 if(tail != nullptr) {
2304 const char* pos = strchr(tail, '=');
2305 char* name;
2306 if (pos == nullptr) {
2307 name = os::strdup_check_oom(tail, mtArguments);
2308 } else {
2309 size_t len = pos - tail;
2310 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2311 memcpy(name, tail, len);
2312 name[len] = '\0';
2313 }
2314
2315 char *options = nullptr;
2316 if(pos != nullptr) {
2317 options = os::strdup_check_oom(pos + 1, mtArguments);
2318 }
2319 #if !INCLUDE_JVMTI
2320 if (valid_jdwp_agent(name, is_absolute_path)) {
2321 jio_fprintf(defaultStream::error_stream(),
2322 "Debugging agents are not supported in this VM\n");
2323 return JNI_ERR;
2324 }
2325 #endif // !INCLUDE_JVMTI
2326 JvmtiAgentList::add(name, options, is_absolute_path);
2327 os::free(name);
2328 os::free(options);
2329 }
2330 // -javaagent
2331 } else if (match_option(option, "-javaagent:", &tail)) {
2332 #if !INCLUDE_JVMTI
2333 jio_fprintf(defaultStream::error_stream(),
2334 "Instrumentation agents are not supported in this VM\n");
2335 return JNI_ERR;
2336 #else
2337 if (tail != nullptr) {
2338 size_t length = strlen(tail) + 1;
2339 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2340 jio_snprintf(options, length, "%s", tail);
2341 JvmtiAgentList::add("instrument", options, false);
2342 FREE_C_HEAP_ARRAY(char, options);
2343
2344 // java agents need module java.instrument
2345 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2346 return JNI_ENOMEM;
2347 }
2348 }
2349 #endif // !INCLUDE_JVMTI
2350 // --enable_preview
2351 } else if (match_option(option, "--enable-preview")) {
2352 set_enable_preview();
2353 // -Xnoclassgc
2354 } else if (match_option(option, "-Xnoclassgc")) {
2355 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2356 return JNI_EINVAL;
2357 }
2358 // -Xbatch
2359 } else if (match_option(option, "-Xbatch")) {
2360 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2361 return JNI_EINVAL;
2362 }
2363 // -Xmn for compatibility with other JVM vendors
2364 } else if (match_option(option, "-Xmn", &tail)) {
2365 julong long_initial_young_size = 0;
2366 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2367 if (errcode != arg_in_range) {
2368 jio_fprintf(defaultStream::error_stream(),
2369 "Invalid initial young generation size: %s\n", option->optionString);
2370 describe_range_error(errcode);
2371 return JNI_EINVAL;
2372 }
2373 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2374 return JNI_EINVAL;
2375 }
2376 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2377 return JNI_EINVAL;
2378 }
2379 // -Xms
2380 } else if (match_option(option, "-Xms", &tail)) {
2381 julong size = 0;
2382 // an initial heap size of 0 means automatically determine
2383 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2384 if (errcode != arg_in_range) {
2385 jio_fprintf(defaultStream::error_stream(),
2386 "Invalid initial heap size: %s\n", option->optionString);
2387 describe_range_error(errcode);
2388 return JNI_EINVAL;
2389 }
2390 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2391 return JNI_EINVAL;
2392 }
2393 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2394 return JNI_EINVAL;
2395 }
2396 // -Xmx
2397 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2398 julong long_max_heap_size = 0;
2399 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2400 if (errcode != arg_in_range) {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "Invalid maximum heap size: %s\n", option->optionString);
2403 describe_range_error(errcode);
2404 return JNI_EINVAL;
2405 }
2406 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2407 return JNI_EINVAL;
2408 }
2409 // Xmaxf
2410 } else if (match_option(option, "-Xmaxf", &tail)) {
2411 char* err;
2412 int maxf = (int)(strtod(tail, &err) * 100);
2413 if (*err != '\0' || *tail == '\0') {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Bad max heap free percentage size: %s\n",
2416 option->optionString);
2417 return JNI_EINVAL;
2418 } else {
2419 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2420 return JNI_EINVAL;
2421 }
2422 }
2423 // Xminf
2424 } else if (match_option(option, "-Xminf", &tail)) {
2425 char* err;
2426 int minf = (int)(strtod(tail, &err) * 100);
2427 if (*err != '\0' || *tail == '\0') {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Bad min heap free percentage size: %s\n",
2430 option->optionString);
2431 return JNI_EINVAL;
2432 } else {
2433 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2434 return JNI_EINVAL;
2435 }
2436 }
2437 // -Xss
2438 } else if (match_option(option, "-Xss", &tail)) {
2439 intx value = 0;
2440 jint err = parse_xss(option, tail, &value);
2441 if (err != JNI_OK) {
2442 return err;
2443 }
2444 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2445 return JNI_EINVAL;
2446 }
2447 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2448 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2449 julong long_ReservedCodeCacheSize = 0;
2450
2451 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2452 if (errcode != arg_in_range) {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "Invalid maximum code cache size: %s.\n", option->optionString);
2455 return JNI_EINVAL;
2456 }
2457 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2458 return JNI_EINVAL;
2459 }
2460 // -green
2461 } else if (match_option(option, "-green")) {
2462 jio_fprintf(defaultStream::error_stream(),
2463 "Green threads support not available\n");
2464 return JNI_EINVAL;
2465 // -native
2466 } else if (match_option(option, "-native")) {
2467 // HotSpot always uses native threads, ignore silently for compatibility
2468 // -Xrs
2469 } else if (match_option(option, "-Xrs")) {
2470 // Classic/EVM option, new functionality
2471 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2472 return JNI_EINVAL;
2473 }
2474 // -Xprof
2475 } else if (match_option(option, "-Xprof")) {
2476 char version[256];
2477 // Obsolete in JDK 10
2478 JDK_Version::jdk(10).to_string(version, sizeof(version));
2479 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2480 // -Xinternalversion
2481 } else if (match_option(option, "-Xinternalversion")) {
2482 jio_fprintf(defaultStream::output_stream(), "%s\n",
2483 VM_Version::internal_vm_info_string());
2484 vm_exit(0);
2485 #ifndef PRODUCT
2486 // -Xprintflags
2487 } else if (match_option(option, "-Xprintflags")) {
2488 JVMFlag::printFlags(tty, false);
2489 vm_exit(0);
2490 #endif
2491 // -D
2492 } else if (match_option(option, "-D", &tail)) {
2493 const char* value;
2494 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2495 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2496 // abort if -Djava.endorsed.dirs is set
2497 jio_fprintf(defaultStream::output_stream(),
2498 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2499 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2500 return JNI_EINVAL;
2501 }
2502 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2503 *value != '\0' && strcmp(value, "\"\"") != 0) {
2504 // abort if -Djava.ext.dirs is set
2505 jio_fprintf(defaultStream::output_stream(),
2506 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2507 return JNI_EINVAL;
2508 }
2509 // Check for module related properties. They must be set using the modules
2510 // options. For example: use "--add-modules=java.sql", not
2511 // "-Djdk.module.addmods=java.sql"
2512 if (is_internal_module_property(option->optionString + 2)) {
2513 needs_module_property_warning = true;
2514 continue;
2515 }
2516 if (!add_property(tail)) {
2517 return JNI_ENOMEM;
2518 }
2519 // Out of the box management support
2520 if (match_option(option, "-Dcom.sun.management", &tail)) {
2521 #if INCLUDE_MANAGEMENT
2522 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2523 return JNI_EINVAL;
2524 }
2525 // management agent in module jdk.management.agent
2526 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2527 return JNI_ENOMEM;
2528 }
2529 #else
2530 jio_fprintf(defaultStream::output_stream(),
2531 "-Dcom.sun.management is not supported in this VM.\n");
2532 return JNI_ERR;
2533 #endif
2534 }
2535 // -Xint
2536 } else if (match_option(option, "-Xint")) {
2537 set_mode_flags(_int);
2538 mode_flag_cmd_line = true;
2539 // -Xmixed
2540 } else if (match_option(option, "-Xmixed")) {
2541 set_mode_flags(_mixed);
2542 mode_flag_cmd_line = true;
2543 // -Xcomp
2544 } else if (match_option(option, "-Xcomp")) {
2545 // for testing the compiler; turn off all flags that inhibit compilation
2546 set_mode_flags(_comp);
2547 mode_flag_cmd_line = true;
2548 // -Xshare:dump
2549 } else if (match_option(option, "-Xshare:dump")) {
2550 CDSConfig::enable_dumping_static_archive();
2551 // -Xshare:on
2552 } else if (match_option(option, "-Xshare:on")) {
2553 UseSharedSpaces = true;
2554 RequireSharedSpaces = true;
2555 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2556 } else if (match_option(option, "-Xshare:auto")) {
2557 UseSharedSpaces = true;
2558 RequireSharedSpaces = false;
2559 xshare_auto_cmd_line = true;
2560 // -Xshare:off
2561 } else if (match_option(option, "-Xshare:off")) {
2562 UseSharedSpaces = false;
2563 RequireSharedSpaces = false;
2564 // -Xverify
2565 } else if (match_option(option, "-Xverify", &tail)) {
2566 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2567 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2568 return JNI_EINVAL;
2569 }
2570 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2571 return JNI_EINVAL;
2572 }
2573 } else if (strcmp(tail, ":remote") == 0) {
2574 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2578 return JNI_EINVAL;
2579 }
2580 } else if (strcmp(tail, ":none") == 0) {
2581 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2582 return JNI_EINVAL;
2583 }
2584 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2585 return JNI_EINVAL;
2586 }
2587 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2588 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2589 return JNI_EINVAL;
2590 }
2591 // -Xdebug
2592 } else if (match_option(option, "-Xdebug")) {
2593 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2594 // -Xnoagent
2595 } else if (match_option(option, "-Xnoagent")) {
2596 warning("Option -Xnoagent was deprecated in JDK 22 and will likely be removed in a future release.");
2597 } else if (match_option(option, "-Xloggc:", &tail)) {
2598 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2599 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2600 _legacyGCLogging.lastFlag = 2;
2601 _legacyGCLogging.file = os::strdup_check_oom(tail);
2602 } else if (match_option(option, "-Xlog", &tail)) {
2603 bool ret = false;
2604 if (strcmp(tail, ":help") == 0) {
2605 fileStream stream(defaultStream::output_stream());
2606 LogConfiguration::print_command_line_help(&stream);
2607 vm_exit(0);
2608 } else if (strcmp(tail, ":disable") == 0) {
2609 LogConfiguration::disable_logging();
2610 ret = true;
2611 } else if (strcmp(tail, ":async") == 0) {
2612 LogConfiguration::set_async_mode(true);
2613 ret = true;
2614 } else if (*tail == '\0') {
2615 ret = LogConfiguration::parse_command_line_arguments();
2616 assert(ret, "-Xlog without arguments should never fail to parse");
2617 } else if (*tail == ':') {
2618 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2619 }
2620 if (ret == false) {
2621 jio_fprintf(defaultStream::error_stream(),
2622 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2623 tail);
2624 return JNI_EINVAL;
2625 }
2626 // JNI hooks
2627 } else if (match_option(option, "-Xcheck", &tail)) {
2628 if (!strcmp(tail, ":jni")) {
2629 #if !INCLUDE_JNI_CHECK
2630 warning("JNI CHECKING is not supported in this VM");
2631 #else
2632 CheckJNICalls = true;
2633 #endif // INCLUDE_JNI_CHECK
2634 } else if (is_bad_option(option, args->ignoreUnrecognized,
2635 "check")) {
2636 return JNI_EINVAL;
2637 }
2638 } else if (match_option(option, "vfprintf")) {
2639 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2640 } else if (match_option(option, "exit")) {
2641 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2642 } else if (match_option(option, "abort")) {
2643 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2644 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2645 // and the last option wins.
2646 } else if (match_option(option, "-XX:+NeverTenure")) {
2647 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2648 return JNI_EINVAL;
2649 }
2650 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2651 return JNI_EINVAL;
2652 }
2653 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2657 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2658 return JNI_EINVAL;
2659 }
2660 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2667 uint max_tenuring_thresh = 0;
2668 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2669 jio_fprintf(defaultStream::error_stream(),
2670 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2671 return JNI_EINVAL;
2672 }
2673
2674 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2675 return JNI_EINVAL;
2676 }
2677
2678 if (MaxTenuringThreshold == 0) {
2679 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 } else {
2686 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 }
2693 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2694 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2701 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2708 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2715 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2719 return JNI_EINVAL;
2720 }
2721 } else if (match_option(option, "--finalization=", &tail)) {
2722 if (strcmp(tail, "enabled") == 0) {
2723 InstanceKlass::set_finalization_enabled(true);
2724 } else if (strcmp(tail, "disabled") == 0) {
2725 InstanceKlass::set_finalization_enabled(false);
2726 } else {
2727 jio_fprintf(defaultStream::error_stream(),
2728 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2729 tail);
2730 return JNI_EINVAL;
2731 }
2732 #if !defined(DTRACE_ENABLED)
2733 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2734 jio_fprintf(defaultStream::error_stream(),
2735 "DTraceMethodProbes flag is not applicable for this configuration\n");
2736 return JNI_EINVAL;
2737 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2738 jio_fprintf(defaultStream::error_stream(),
2739 "DTraceAllocProbes flag is not applicable for this configuration\n");
2740 return JNI_EINVAL;
2741 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2742 jio_fprintf(defaultStream::error_stream(),
2743 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2744 return JNI_EINVAL;
2745 #endif // !defined(DTRACE_ENABLED)
2746 #ifdef ASSERT
2747 } else if (match_option(option, "-XX:+FullGCALot")) {
2748 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 // disable scavenge before parallel mark-compact
2752 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 #endif
2756 #if !INCLUDE_MANAGEMENT
2757 } else if (match_option(option, "-XX:+ManagementServer")) {
2758 jio_fprintf(defaultStream::error_stream(),
2759 "ManagementServer is not supported in this VM.\n");
2760 return JNI_ERR;
2761 #endif // INCLUDE_MANAGEMENT
2762 #if INCLUDE_JVMCI
2763 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2764 if (EnableJVMCIProduct) {
2765 jio_fprintf(defaultStream::error_stream(),
2766 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2767 return JNI_EINVAL;
2768 }
2769 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2770 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2771 if (use_graal_jit) {
2772 const char* jvmci_compiler = get_property("jvmci.Compiler");
2773 if (jvmci_compiler != nullptr) {
2774 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2775 jio_fprintf(defaultStream::error_stream(),
2776 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2777 return JNI_ERR;
2778 }
2779 } else if (!add_property("jvmci.Compiler=graal")) {
2780 return JNI_ENOMEM;
2781 }
2782 }
2783
2784 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2785 if (EnableJVMCIProduct) {
2786 continue;
2787 }
2788 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2789 // Allow this flag if it has been unlocked.
2790 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2791 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2792 jio_fprintf(defaultStream::error_stream(),
2793 "Unable to enable JVMCI in product mode\n");
2794 return JNI_ERR;
2795 }
2796 }
2797 // The flag was locked so process normally to report that error
2798 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2799 return JNI_EINVAL;
2800 }
2801 #endif // INCLUDE_JVMCI
2802 #if INCLUDE_JFR
2803 } else if (match_jfr_option(&option)) {
2804 return JNI_EINVAL;
2805 #endif
2806 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2807 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2808 // already been handled
2809 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2810 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2811 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2812 return JNI_EINVAL;
2813 }
2814 }
2815 // Unknown option
2816 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2817 return JNI_ERR;
2818 }
2819 }
2820
2821 // PrintSharedArchiveAndExit will turn on
2822 // -Xshare:on
2823 // -Xlog:class+path=info
2824 if (PrintSharedArchiveAndExit) {
2825 UseSharedSpaces = true;
2826 RequireSharedSpaces = true;
2827 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2828 }
2829
2830 fix_appclasspath();
2831
2832 return JNI_OK;
2833 }
2834
2835 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2836 // For java.base check for duplicate --patch-module options being specified on the command line.
2837 // This check is only required for java.base, all other duplicate module specifications
2838 // will be checked during module system initialization. The module system initialization
2839 // will throw an ExceptionInInitializerError if this situation occurs.
2840 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2841 if (*patch_mod_javabase) {
2842 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2843 } else {
2844 *patch_mod_javabase = true;
2845 }
2846 }
2847
2848 // Create GrowableArray lazily, only if --patch-module has been specified
2849 if (_patch_mod_prefix == nullptr) {
2850 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2851 }
2852
2853 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2854 }
2855
2856 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2857 //
2858 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2859 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2860 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2861 // path is treated as the current directory.
2862 //
2863 // This causes problems with CDS, which requires that all directories specified in the classpath
2864 // must be empty. In most cases, applications do NOT want to load classes from the current
2865 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2866 // scripts compatible with CDS.
2867 void Arguments::fix_appclasspath() {
2868 if (IgnoreEmptyClassPaths) {
2869 const char separator = *os::path_separator();
2870 const char* src = _java_class_path->value();
2871
2872 // skip over all the leading empty paths
2873 while (*src == separator) {
2874 src ++;
2875 }
2876
2877 char* copy = os::strdup_check_oom(src, mtArguments);
2878
2879 // trim all trailing empty paths
2880 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2881 *tail = '\0';
2882 }
2883
2884 char from[3] = {separator, separator, '\0'};
2885 char to [2] = {separator, '\0'};
2886 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2887 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2888 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2889 }
2890
2891 _java_class_path->set_writeable_value(copy);
2892 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2893 }
2894 }
2895
2896 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2897 // check if the default lib/endorsed directory exists; if so, error
2898 char path[JVM_MAXPATHLEN];
2899 const char* fileSep = os::file_separator();
2900 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2901
2902 DIR* dir = os::opendir(path);
2903 if (dir != nullptr) {
2904 jio_fprintf(defaultStream::output_stream(),
2905 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2906 "in modular form will be supported via the concept of upgradeable modules.\n");
2907 os::closedir(dir);
2908 return JNI_ERR;
2909 }
2910
2911 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2912 dir = os::opendir(path);
2913 if (dir != nullptr) {
2914 jio_fprintf(defaultStream::output_stream(),
2915 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2916 "Use -classpath instead.\n.");
2917 os::closedir(dir);
2918 return JNI_ERR;
2919 }
2920
2921 // This must be done after all arguments have been processed
2922 // and the container support has been initialized since AggressiveHeap
2923 // relies on the amount of total memory available.
2924 if (AggressiveHeap) {
2925 jint result = set_aggressive_heap_flags();
2926 if (result != JNI_OK) {
2927 return result;
2928 }
2929 }
2930
2931 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2932 // but like -Xint, leave compilation thresholds unaffected.
2933 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2934 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2935 set_mode_flags(_int);
2936 }
2937
2938 #ifdef ZERO
2939 // Zero always runs in interpreted mode
2940 set_mode_flags(_int);
2941 #endif
2942
2943 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2944 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2945 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2946 }
2947
2948 #if !COMPILER2_OR_JVMCI
2949 // Don't degrade server performance for footprint
2950 if (FLAG_IS_DEFAULT(UseLargePages) &&
2951 MaxHeapSize < LargePageHeapSizeThreshold) {
2952 // No need for large granularity pages w/small heaps.
2953 // Note that large pages are enabled/disabled for both the
2954 // Java heap and the code cache.
2955 FLAG_SET_DEFAULT(UseLargePages, false);
2956 }
2957
2958 UNSUPPORTED_OPTION(ProfileInterpreter);
2959 #endif
2960
2961 // Parse the CompilationMode flag
2962 if (!CompilationModeFlag::initialize()) {
2963 return JNI_ERR;
2964 }
2965
2966 if (!check_vm_args_consistency()) {
2967 return JNI_ERR;
2968 }
2969
2970 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2971 return JNI_ERR;
2972 }
2973
2974 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2975 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2976 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2977
2978 return JNI_OK;
2979 }
2980
2981 // Helper class for controlling the lifetime of JavaVMInitArgs
2982 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2983 // deleted on the destruction of the ScopedVMInitArgs object.
2984 class ScopedVMInitArgs : public StackObj {
2985 private:
2986 JavaVMInitArgs _args;
2987 char* _container_name;
2988 bool _is_set;
2989 char* _vm_options_file_arg;
2990
2991 public:
2992 ScopedVMInitArgs(const char *container_name) {
2993 _args.version = JNI_VERSION_1_2;
2994 _args.nOptions = 0;
2995 _args.options = nullptr;
2996 _args.ignoreUnrecognized = false;
2997 _container_name = (char *)container_name;
2998 _is_set = false;
2999 _vm_options_file_arg = nullptr;
3000 }
3001
3002 // Populates the JavaVMInitArgs object represented by this
3003 // ScopedVMInitArgs object with the arguments in options. The
3004 // allocated memory is deleted by the destructor. If this method
3005 // returns anything other than JNI_OK, then this object is in a
3006 // partially constructed state, and should be abandoned.
3007 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3008 _is_set = true;
3009 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3010 JavaVMOption, options->length(), mtArguments);
3011 if (options_arr == nullptr) {
3012 return JNI_ENOMEM;
3013 }
3014 _args.options = options_arr;
3015
3016 for (int i = 0; i < options->length(); i++) {
3017 options_arr[i] = options->at(i);
3018 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3019 if (options_arr[i].optionString == nullptr) {
3020 // Rely on the destructor to do cleanup.
3021 _args.nOptions = i;
3022 return JNI_ENOMEM;
3023 }
3024 }
3025
3026 _args.nOptions = options->length();
3027 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3028 return JNI_OK;
3029 }
3030
3031 JavaVMInitArgs* get() { return &_args; }
3032 char* container_name() { return _container_name; }
3033 bool is_set() { return _is_set; }
3034 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3035 char* vm_options_file_arg() { return _vm_options_file_arg; }
3036
3037 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3038 if (_vm_options_file_arg != nullptr) {
3039 os::free(_vm_options_file_arg);
3040 }
3041 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3042 }
3043
3044 ~ScopedVMInitArgs() {
3045 if (_vm_options_file_arg != nullptr) {
3046 os::free(_vm_options_file_arg);
3047 }
3048 if (_args.options == nullptr) return;
3049 for (int i = 0; i < _args.nOptions; i++) {
3050 os::free(_args.options[i].optionString);
3051 }
3052 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3053 }
3054
3055 // Insert options into this option list, to replace option at
3056 // vm_options_file_pos (-XX:VMOptionsFile)
3057 jint insert(const JavaVMInitArgs* args,
3058 const JavaVMInitArgs* args_to_insert,
3059 const int vm_options_file_pos) {
3060 assert(_args.options == nullptr, "shouldn't be set yet");
3061 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3062 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3063
3064 int length = args->nOptions + args_to_insert->nOptions - 1;
3065 // Construct new option array
3066 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3067 for (int i = 0; i < args->nOptions; i++) {
3068 if (i == vm_options_file_pos) {
3069 // insert the new options starting at the same place as the
3070 // -XX:VMOptionsFile option
3071 for (int j = 0; j < args_to_insert->nOptions; j++) {
3072 options.push(args_to_insert->options[j]);
3073 }
3074 } else {
3075 options.push(args->options[i]);
3076 }
3077 }
3078 // make into options array
3079 return set_args(&options);
3080 }
3081 };
3082
3083 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3084 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3085 }
3086
3087 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3088 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3089 }
3090
3091 jint Arguments::parse_options_environment_variable(const char* name,
3092 ScopedVMInitArgs* vm_args) {
3093 char *buffer = ::getenv(name);
3094
3095 // Don't check this environment variable if user has special privileges
3096 // (e.g. unix su command).
3097 if (buffer == nullptr || os::have_special_privileges()) {
3098 return JNI_OK;
3099 }
3100
3101 if ((buffer = os::strdup(buffer)) == nullptr) {
3102 return JNI_ENOMEM;
3103 }
3104
3105 jio_fprintf(defaultStream::error_stream(),
3106 "Picked up %s: %s\n", name, buffer);
3107
3108 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3109
3110 os::free(buffer);
3111 return retcode;
3112 }
3113
3114 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3115 // read file into buffer
3116 int fd = ::open(file_name, O_RDONLY);
3117 if (fd < 0) {
3118 jio_fprintf(defaultStream::error_stream(),
3119 "Could not open options file '%s'\n",
3120 file_name);
3121 return JNI_ERR;
3122 }
3123
3124 struct stat stbuf;
3125 int retcode = os::stat(file_name, &stbuf);
3126 if (retcode != 0) {
3127 jio_fprintf(defaultStream::error_stream(),
3128 "Could not stat options file '%s'\n",
3129 file_name);
3130 ::close(fd);
3131 return JNI_ERR;
3132 }
3133
3134 if (stbuf.st_size == 0) {
3135 // tell caller there is no option data and that is ok
3136 ::close(fd);
3137 return JNI_OK;
3138 }
3139
3140 // '+ 1' for null termination even with max bytes
3141 size_t bytes_alloc = stbuf.st_size + 1;
3142
3143 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3144 if (nullptr == buf) {
3145 jio_fprintf(defaultStream::error_stream(),
3146 "Could not allocate read buffer for options file parse\n");
3147 ::close(fd);
3148 return JNI_ENOMEM;
3149 }
3150
3151 memset(buf, 0, bytes_alloc);
3152
3153 // Fill buffer
3154 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3155 ::close(fd);
3156 if (bytes_read < 0) {
3157 FREE_C_HEAP_ARRAY(char, buf);
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Could not read options file '%s'\n", file_name);
3160 return JNI_ERR;
3161 }
3162
3163 if (bytes_read == 0) {
3164 // tell caller there is no option data and that is ok
3165 FREE_C_HEAP_ARRAY(char, buf);
3166 return JNI_OK;
3167 }
3168
3169 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3170
3171 FREE_C_HEAP_ARRAY(char, buf);
3172 return retcode;
3173 }
3174
3175 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3176 // Construct option array
3177 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3178
3179 // some pointers to help with parsing
3180 char *buffer_end = buffer + buf_len;
3181 char *opt_hd = buffer;
3182 char *wrt = buffer;
3183 char *rd = buffer;
3184
3185 // parse all options
3186 while (rd < buffer_end) {
3187 // skip leading white space from the input string
3188 while (rd < buffer_end && isspace(*rd)) {
3189 rd++;
3190 }
3191
3192 if (rd >= buffer_end) {
3193 break;
3194 }
3195
3196 // Remember this is where we found the head of the token.
3197 opt_hd = wrt;
3198
3199 // Tokens are strings of non white space characters separated
3200 // by one or more white spaces.
3201 while (rd < buffer_end && !isspace(*rd)) {
3202 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3203 int quote = *rd; // matching quote to look for
3204 rd++; // don't copy open quote
3205 while (rd < buffer_end && *rd != quote) {
3206 // include everything (even spaces)
3207 // up until the close quote
3208 *wrt++ = *rd++; // copy to option string
3209 }
3210
3211 if (rd < buffer_end) {
3212 rd++; // don't copy close quote
3213 } else {
3214 // did not see closing quote
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Unmatched quote in %s\n", name);
3217 return JNI_ERR;
3218 }
3219 } else {
3220 *wrt++ = *rd++; // copy to option string
3221 }
3222 }
3223
3224 // steal a white space character and set it to null
3225 *wrt++ = '\0';
3226 // We now have a complete token
3227
3228 JavaVMOption option;
3229 option.optionString = opt_hd;
3230 option.extraInfo = nullptr;
3231
3232 options.append(option); // Fill in option
3233
3234 rd++; // Advance to next character
3235 }
3236
3237 // Fill out JavaVMInitArgs structure.
3238 return vm_args->set_args(&options);
3239 }
3240
3241 #ifndef PRODUCT
3242 // Determine whether LogVMOutput should be implicitly turned on.
3243 static bool use_vm_log() {
3244 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3245 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3246 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3247 PrintAssembly || TraceDeoptimization ||
3248 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3249 return true;
3250 }
3251
3252 #ifdef COMPILER1
3253 if (PrintC1Statistics) {
3254 return true;
3255 }
3256 #endif // COMPILER1
3257
3258 #ifdef COMPILER2
3259 if (PrintOptoAssembly || PrintOptoStatistics) {
3260 return true;
3261 }
3262 #endif // COMPILER2
3263
3264 return false;
3265 }
3266
3267 #endif // PRODUCT
3268
3269 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3270 for (int index = 0; index < args->nOptions; index++) {
3271 const JavaVMOption* option = args->options + index;
3272 const char* tail;
3273 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3274 return true;
3275 }
3276 }
3277 return false;
3278 }
3279
3280 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3281 const char* vm_options_file,
3282 const int vm_options_file_pos,
3283 ScopedVMInitArgs* vm_options_file_args,
3284 ScopedVMInitArgs* args_out) {
3285 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3286 if (code != JNI_OK) {
3287 return code;
3288 }
3289
3290 if (vm_options_file_args->get()->nOptions < 1) {
3291 return JNI_OK;
3292 }
3293
3294 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3295 jio_fprintf(defaultStream::error_stream(),
3296 "A VM options file may not refer to a VM options file. "
3297 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3298 "options file '%s' in options container '%s' is an error.\n",
3299 vm_options_file_args->vm_options_file_arg(),
3300 vm_options_file_args->container_name());
3301 return JNI_EINVAL;
3302 }
3303
3304 return args_out->insert(args, vm_options_file_args->get(),
3305 vm_options_file_pos);
3306 }
3307
3308 // Expand -XX:VMOptionsFile found in args_in as needed.
3309 // mod_args and args_out parameters may return values as needed.
3310 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3311 ScopedVMInitArgs* mod_args,
3312 JavaVMInitArgs** args_out) {
3313 jint code = match_special_option_and_act(args_in, mod_args);
3314 if (code != JNI_OK) {
3315 return code;
3316 }
3317
3318 if (mod_args->is_set()) {
3319 // args_in contains -XX:VMOptionsFile and mod_args contains the
3320 // original options from args_in along with the options expanded
3321 // from the VMOptionsFile. Return a short-hand to the caller.
3322 *args_out = mod_args->get();
3323 } else {
3324 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3325 }
3326 return JNI_OK;
3327 }
3328
3329 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3330 ScopedVMInitArgs* args_out) {
3331 // Remaining part of option string
3332 const char* tail;
3333 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3334
3335 for (int index = 0; index < args->nOptions; index++) {
3336 const JavaVMOption* option = args->options + index;
3337 if (match_option(option, "-XX:Flags=", &tail)) {
3338 Arguments::set_jvm_flags_file(tail);
3339 continue;
3340 }
3341 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3342 if (vm_options_file_args.found_vm_options_file_arg()) {
3343 jio_fprintf(defaultStream::error_stream(),
3344 "The option '%s' is already specified in the options "
3345 "container '%s' so the specification of '%s' in the "
3346 "same options container is an error.\n",
3347 vm_options_file_args.vm_options_file_arg(),
3348 vm_options_file_args.container_name(),
3349 option->optionString);
3350 return JNI_EINVAL;
3351 }
3352 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3353 // If there's a VMOptionsFile, parse that
3354 jint code = insert_vm_options_file(args, tail, index,
3355 &vm_options_file_args, args_out);
3356 if (code != JNI_OK) {
3357 return code;
3358 }
3359 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3360 if (args_out->is_set()) {
3361 // The VMOptions file inserted some options so switch 'args'
3362 // to the new set of options, and continue processing which
3363 // preserves "last option wins" semantics.
3364 args = args_out->get();
3365 // The first option from the VMOptionsFile replaces the
3366 // current option. So we back track to process the
3367 // replacement option.
3368 index--;
3369 }
3370 continue;
3371 }
3372 if (match_option(option, "-XX:+PrintVMOptions")) {
3373 PrintVMOptions = true;
3374 continue;
3375 }
3376 if (match_option(option, "-XX:-PrintVMOptions")) {
3377 PrintVMOptions = false;
3378 continue;
3379 }
3380 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3381 IgnoreUnrecognizedVMOptions = true;
3382 continue;
3383 }
3384 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3385 IgnoreUnrecognizedVMOptions = false;
3386 continue;
3387 }
3388 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3389 JVMFlag::printFlags(tty, false);
3390 vm_exit(0);
3391 }
3392
3393 #ifndef PRODUCT
3394 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3395 JVMFlag::printFlags(tty, true);
3396 vm_exit(0);
3397 }
3398 #endif
3399 }
3400 return JNI_OK;
3401 }
3402
3403 static void print_options(const JavaVMInitArgs *args) {
3404 const char* tail;
3405 for (int index = 0; index < args->nOptions; index++) {
3406 const JavaVMOption *option = args->options + index;
3407 if (match_option(option, "-XX:", &tail)) {
3408 logOption(tail);
3409 }
3410 }
3411 }
3412
3413 bool Arguments::handle_deprecated_print_gc_flags() {
3414 if (PrintGC) {
3415 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3416 }
3417 if (PrintGCDetails) {
3418 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3419 }
3420
3421 if (_legacyGCLogging.lastFlag == 2) {
3422 // -Xloggc was used to specify a filename
3423 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3424
3425 LogTarget(Error, logging) target;
3426 LogStream errstream(target);
3427 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3428 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3429 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3430 }
3431 return true;
3432 }
3433
3434 static void apply_debugger_ergo() {
3435 #ifndef PRODUCT
3436 // UseDebuggerErgo is notproduct
3437 if (ReplayCompiles) {
3438 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3439 }
3440 #endif
3441
3442 #ifndef PRODUCT
3443 if (UseDebuggerErgo) {
3444 // Turn on sub-flags
3445 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3446 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3447 }
3448 #endif
3449
3450 if (UseDebuggerErgo2) {
3451 // Debugging with limited number of CPUs
3452 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3453 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3454 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3455 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3456 }
3457 }
3458
3459 // Parse entry point called from JNI_CreateJavaVM
3460
3461 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3462 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3463 JVMFlag::check_all_flag_declarations();
3464
3465 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3466 const char* hotspotrc = ".hotspotrc";
3467 bool settings_file_specified = false;
3468 bool needs_hotspotrc_warning = false;
3469 ScopedVMInitArgs initial_vm_options_args("");
3470 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3471 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3472
3473 // Pointers to current working set of containers
3474 JavaVMInitArgs* cur_cmd_args;
3475 JavaVMInitArgs* cur_vm_options_args;
3476 JavaVMInitArgs* cur_java_options_args;
3477 JavaVMInitArgs* cur_java_tool_options_args;
3478
3479 // Containers for modified/expanded options
3480 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3481 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3482 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3483 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3484
3485
3486 jint code =
3487 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3488 if (code != JNI_OK) {
3489 return code;
3490 }
3491
3492 code = parse_java_options_environment_variable(&initial_java_options_args);
3493 if (code != JNI_OK) {
3494 return code;
3495 }
3496
3497 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3498 char *vmoptions = ClassLoader::lookup_vm_options();
3499 if (vmoptions != nullptr) {
3500 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3501 FREE_C_HEAP_ARRAY(char, vmoptions);
3502 if (code != JNI_OK) {
3503 return code;
3504 }
3505 }
3506
3507 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3508 &mod_java_tool_options_args,
3509 &cur_java_tool_options_args);
3510 if (code != JNI_OK) {
3511 return code;
3512 }
3513
3514 code = expand_vm_options_as_needed(initial_cmd_args,
3515 &mod_cmd_args,
3516 &cur_cmd_args);
3517 if (code != JNI_OK) {
3518 return code;
3519 }
3520
3521 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3522 &mod_java_options_args,
3523 &cur_java_options_args);
3524 if (code != JNI_OK) {
3525 return code;
3526 }
3527
3528 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3529 &mod_vm_options_args,
3530 &cur_vm_options_args);
3531 if (code != JNI_OK) {
3532 return code;
3533 }
3534
3535 const char* flags_file = Arguments::get_jvm_flags_file();
3536 settings_file_specified = (flags_file != nullptr);
3537
3538 if (IgnoreUnrecognizedVMOptions) {
3539 cur_cmd_args->ignoreUnrecognized = true;
3540 cur_java_tool_options_args->ignoreUnrecognized = true;
3541 cur_java_options_args->ignoreUnrecognized = true;
3542 }
3543
3544 // Parse specified settings file
3545 if (settings_file_specified) {
3546 if (!process_settings_file(flags_file, true,
3547 cur_cmd_args->ignoreUnrecognized)) {
3548 return JNI_EINVAL;
3549 }
3550 } else {
3551 #ifdef ASSERT
3552 // Parse default .hotspotrc settings file
3553 if (!process_settings_file(".hotspotrc", false,
3554 cur_cmd_args->ignoreUnrecognized)) {
3555 return JNI_EINVAL;
3556 }
3557 #else
3558 struct stat buf;
3559 if (os::stat(hotspotrc, &buf) == 0) {
3560 needs_hotspotrc_warning = true;
3561 }
3562 #endif
3563 }
3564
3565 if (PrintVMOptions) {
3566 print_options(cur_java_tool_options_args);
3567 print_options(cur_cmd_args);
3568 print_options(cur_java_options_args);
3569 }
3570
3571 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3572 jint result = parse_vm_init_args(cur_vm_options_args,
3573 cur_java_tool_options_args,
3574 cur_java_options_args,
3575 cur_cmd_args);
3576
3577 if (result != JNI_OK) {
3578 return result;
3579 }
3580
3581 // Delay warning until here so that we've had a chance to process
3582 // the -XX:-PrintWarnings flag
3583 if (needs_hotspotrc_warning) {
3584 warning("%s file is present but has been ignored. "
3585 "Run with -XX:Flags=%s to load the file.",
3586 hotspotrc, hotspotrc);
3587 }
3588
3589 if (needs_module_property_warning) {
3590 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3591 " names that are reserved for internal use.");
3592 }
3593
3594 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3595 UNSUPPORTED_OPTION(UseLargePages);
3596 #endif
3597
3598 #if defined(AIX)
3599 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3600 #endif
3601
3602 #ifndef PRODUCT
3603 if (TraceBytecodesAt != 0) {
3604 TraceBytecodes = true;
3605 }
3606 #endif // PRODUCT
3607
3608 if (ScavengeRootsInCode == 0) {
3609 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3610 warning("Forcing ScavengeRootsInCode non-zero");
3611 }
3612 ScavengeRootsInCode = 1;
3613 }
3614
3615 if (!handle_deprecated_print_gc_flags()) {
3616 return JNI_EINVAL;
3617 }
3618
3619 // Set object alignment values.
3620 set_object_alignment();
3621
3622 #if !INCLUDE_CDS
3623 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3624 jio_fprintf(defaultStream::error_stream(),
3625 "Shared spaces are not supported in this VM\n");
3626 return JNI_ERR;
3627 }
3628 if (DumpLoadedClassList != nullptr) {
3629 jio_fprintf(defaultStream::error_stream(),
3630 "DumpLoadedClassList is not supported in this VM\n");
3631 return JNI_ERR;
3632 }
3633 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3634 log_is_enabled(Info, cds)) {
3635 warning("Shared spaces are not supported in this VM");
3636 UseSharedSpaces = false;
3637 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3638 }
3639 no_shared_spaces("CDS Disabled");
3640 #endif // INCLUDE_CDS
3641
3642 // Verify NMT arguments
3643 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3644 if (lvl == NMT_unknown) {
3645 jio_fprintf(defaultStream::error_stream(),
3646 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3647 return JNI_ERR;
3648 }
3649 if (PrintNMTStatistics && lvl == NMT_off) {
3650 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3651 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3652 }
3653
3654 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3655 if (trace_dependencies && VerifyDependencies) {
3656 warning("dependency logging results may be inflated by VerifyDependencies");
3657 }
3658
3659 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3660 log_is_enabled(Info, class, load, cause);
3661 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3662 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3663 }
3664
3665 apply_debugger_ergo();
3666
3667 if (log_is_enabled(Info, arguments)) {
3668 LogStream st(Log(arguments)::info());
3669 Arguments::print_on(&st);
3670 }
3671
3672 return JNI_OK;
3673 }
3674
3675 jint Arguments::apply_ergo() {
3676 // Set flags based on ergonomics.
3677 jint result = set_ergonomics_flags();
3678 if (result != JNI_OK) return result;
3679
3680 // Set heap size based on available physical memory
3681 set_heap_size();
3682
3683 GCConfig::arguments()->initialize();
3684
3685 CDSConfig::initialize();
3686
3687 // Initialize Metaspace flags and alignments
3688 Metaspace::ergo_initialize();
3689
3690 if (!StringDedup::ergo_initialize()) {
3691 return JNI_EINVAL;
3692 }
3693
3694 // Set compiler flags after GC is selected and GC specific
3695 // flags (LoopStripMiningIter) are set.
3696 CompilerConfig::ergo_initialize();
3697
3698 // Set bytecode rewriting flags
3699 set_bytecode_flags();
3700
3701 // Set flags if aggressive optimization flags are enabled
3702 jint code = set_aggressive_opts_flags();
3703 if (code != JNI_OK) {
3704 return code;
3705 }
3706
3707 #ifdef ZERO
3708 // Clear flags not supported on zero.
3709 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3710 #endif // ZERO
3711
3712 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3713 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3714 DebugNonSafepoints = true;
3715 }
3716
3717 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3718 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3719 }
3720
3721 // Treat the odd case where local verification is enabled but remote
3722 // verification is not as if both were enabled.
3723 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3724 log_info(verification)("Turning on remote verification because local verification is on");
3725 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3726 }
3727
3728 #ifndef PRODUCT
3729 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3730 if (use_vm_log()) {
3731 LogVMOutput = true;
3732 }
3733 }
3734 #endif // PRODUCT
3735
3736 if (PrintCommandLineFlags) {
3737 JVMFlag::printSetFlags(tty);
3738 }
3739
3740 #if COMPILER2_OR_JVMCI
3741 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3742 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3743 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3744 }
3745 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3746
3747 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3748 if (!EnableVectorReboxing) {
3749 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3750 } else {
3751 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3752 }
3753 }
3754 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3755
3756 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3757 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3758 }
3759 FLAG_SET_DEFAULT(UseVectorStubs, false);
3760 }
3761 #endif // COMPILER2_OR_JVMCI
3762
3763 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3764 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3765 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3766 }
3767 }
3768 return JNI_OK;
3769 }
3770
3771 jint Arguments::adjust_after_os() {
3772 if (UseNUMA) {
3773 if (UseParallelGC) {
3774 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3775 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3776 }
3777 }
3778 }
3779 return JNI_OK;
3780 }
3781
3782 int Arguments::PropertyList_count(SystemProperty* pl) {
3783 int count = 0;
3784 while(pl != nullptr) {
3785 count++;
3786 pl = pl->next();
3787 }
3788 return count;
3789 }
3790
3791 // Return the number of readable properties.
3792 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3793 int count = 0;
3794 while(pl != nullptr) {
3795 if (pl->readable()) {
3796 count++;
3797 }
3798 pl = pl->next();
3799 }
3800 return count;
3801 }
3802
3803 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3804 assert(key != nullptr, "just checking");
3805 SystemProperty* prop;
3806 for (prop = pl; prop != nullptr; prop = prop->next()) {
3807 if (strcmp(key, prop->key()) == 0) return prop->value();
3808 }
3809 return nullptr;
3810 }
3811
3812 // Return the value of the requested property provided that it is a readable property.
3813 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3814 assert(key != nullptr, "just checking");
3815 SystemProperty* prop;
3816 // Return the property value if the keys match and the property is not internal or
3817 // it's the special internal property "jdk.boot.class.path.append".
3818 for (prop = pl; prop != nullptr; prop = prop->next()) {
3819 if (strcmp(key, prop->key()) == 0) {
3820 if (!prop->internal()) {
3821 return prop->value();
3822 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3823 return prop->value();
3824 } else {
3825 // Property is internal and not jdk.boot.class.path.append so return null.
3826 return nullptr;
3827 }
3828 }
3829 }
3830 return nullptr;
3831 }
3832
3833 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3834 SystemProperty* p = *plist;
3835 if (p == nullptr) {
3836 *plist = new_p;
3837 } else {
3838 while (p->next() != nullptr) {
3839 p = p->next();
3840 }
3841 p->set_next(new_p);
3842 }
3843 }
3844
3845 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3846 bool writeable, bool internal) {
3847 if (plist == nullptr)
3848 return;
3849
3850 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3851 PropertyList_add(plist, new_p);
3852 }
3853
3854 void Arguments::PropertyList_add(SystemProperty *element) {
3855 PropertyList_add(&_system_properties, element);
3856 }
3857
3858 // This add maintains unique property key in the list.
3859 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3860 PropertyAppendable append, PropertyWriteable writeable,
3861 PropertyInternal internal) {
3862 if (plist == nullptr)
3863 return;
3864
3865 // If property key exists and is writeable, then update with new value.
3866 // Trying to update a non-writeable property is silently ignored.
3867 SystemProperty* prop;
3868 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3869 if (strcmp(k, prop->key()) == 0) {
3870 if (append == AppendProperty) {
3871 prop->append_writeable_value(v);
3872 } else {
3873 prop->set_writeable_value(v);
3874 }
3875 return;
3876 }
3877 }
3878
3879 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3880 }
3881
3882 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3883 // Returns true if all of the source pointed by src has been copied over to
3884 // the destination buffer pointed by buf. Otherwise, returns false.
3885 // Notes:
3886 // 1. If the length (buflen) of the destination buffer excluding the
3887 // null terminator character is not long enough for holding the expanded
3888 // pid characters, it also returns false instead of returning the partially
3889 // expanded one.
3890 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3891 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3892 char* buf, size_t buflen) {
3893 const char* p = src;
3894 char* b = buf;
3895 const char* src_end = &src[srclen];
3896 char* buf_end = &buf[buflen - 1];
3897
3898 while (p < src_end && b < buf_end) {
3899 if (*p == '%') {
3900 switch (*(++p)) {
3901 case '%': // "%%" ==> "%"
3902 *b++ = *p++;
3903 break;
3904 case 'p': { // "%p" ==> current process id
3905 // buf_end points to the character before the last character so
3906 // that we could write '\0' to the end of the buffer.
3907 size_t buf_sz = buf_end - b + 1;
3908 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3909
3910 // if jio_snprintf fails or the buffer is not long enough to hold
3911 // the expanded pid, returns false.
3912 if (ret < 0 || ret >= (int)buf_sz) {
3913 return false;
3914 } else {
3915 b += ret;
3916 assert(*b == '\0', "fail in copy_expand_pid");
3917 if (p == src_end && b == buf_end + 1) {
3918 // reach the end of the buffer.
3919 return true;
3920 }
3921 }
3922 p++;
3923 break;
3924 }
3925 default :
3926 *b++ = '%';
3927 }
3928 } else {
3929 *b++ = *p++;
3930 }
3931 }
3932 *b = '\0';
3933 return (p == src_end); // return false if not all of the source was copied
3934 }