1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "compiler/compilerDefinitions.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/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 #include <string.h>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104
105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = nullptr;
111 exit_hook_t Arguments::_exit_hook = nullptr;
112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
116 SystemProperty *Arguments::_java_library_path = nullptr;
117 SystemProperty *Arguments::_java_home = nullptr;
118 SystemProperty *Arguments::_java_class_path = nullptr;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
120 SystemProperty *Arguments::_vm_info = nullptr;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
123 PathString *Arguments::_boot_class_path = nullptr;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = nullptr;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 // True if -Xint/-Xmixed/-Xcomp were specified
132 static bool mode_flag_cmd_line = false;
133
134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
136 if (new_value == nullptr) {
137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
138 return false;
139 }
140 if (_value != nullptr) {
141 FreeHeap(_value);
142 }
143 _value = new_value;
144 strcpy(_value, value);
145 return true;
146 }
147
148 void PathString::append_value(const char *value) {
149 char *sp;
150 size_t len = 0;
151 if (value != nullptr) {
152 len = strlen(value);
153 if (_value != nullptr) {
154 len += strlen(_value);
155 }
156 sp = AllocateHeap(len+2, mtArguments);
157 assert(sp != nullptr, "Unable to allocate space for new append path value");
158 if (sp != nullptr) {
159 if (_value != nullptr) {
160 strcpy(sp, _value);
161 strcat(sp, os::path_separator());
162 strcat(sp, value);
163 FreeHeap(_value);
164 } else {
165 strcpy(sp, value);
166 }
167 _value = sp;
168 }
169 }
170 }
171
172 PathString::PathString(const char* value) {
173 if (value == nullptr) {
174 _value = nullptr;
175 } else {
176 _value = AllocateHeap(strlen(value)+1, mtArguments);
177 strcpy(_value, value);
178 }
179 }
180
181 PathString::~PathString() {
182 if (_value != nullptr) {
183 FreeHeap(_value);
184 _value = nullptr;
185 }
186 }
187
188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
190 size_t len = strlen(module_name) + 1;
191 _module_name = AllocateHeap(len, mtInternal);
192 strncpy(_module_name, module_name, len); // copy the trailing null
193 _path = new PathString(path);
194 }
195
196 ModulePatchPath::~ModulePatchPath() {
197 if (_module_name != nullptr) {
198 FreeHeap(_module_name);
199 _module_name = nullptr;
200 }
201 if (_path != nullptr) {
202 delete _path;
203 _path = nullptr;
204 }
205 }
206
207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
208 if (key == nullptr) {
209 _key = nullptr;
210 } else {
211 _key = AllocateHeap(strlen(key)+1, mtArguments);
212 strcpy(_key, key);
213 }
214 _next = nullptr;
215 _internal = internal;
216 _writeable = writeable;
217 }
218
219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220 // part of the option string.
221 static bool match_option(const JavaVMOption *option, const char* name,
222 const char** tail) {
223 size_t len = strlen(name);
224 if (strncmp(option->optionString, name, len) == 0) {
225 *tail = option->optionString + len;
226 return true;
227 } else {
228 return false;
229 }
230 }
231
232 // Check if 'option' matches 'name'. No "tail" is allowed.
233 static bool match_option(const JavaVMOption *option, const char* name) {
234 const char* tail = nullptr;
235 bool result = match_option(option, name, &tail);
236 if (tail != nullptr && *tail == '\0') {
237 return result;
238 } else {
239 return false;
240 }
241 }
242
243 // Return true if any of the strings in null-terminated array 'names' matches.
244 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
245 // the option must match exactly.
246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
247 bool tail_allowed) {
248 for (/* empty */; *names != nullptr; ++names) {
249 if (match_option(option, *names, tail)) {
250 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
251 return true;
252 }
253 }
254 }
255 return false;
256 }
257
258 #if INCLUDE_JFR
259 static bool _has_jfr_option = false; // is using JFR
260
261 // return true on failure
262 static bool match_jfr_option(const JavaVMOption** option) {
263 assert((*option)->optionString != nullptr, "invariant");
264 char* tail = nullptr;
265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
266 _has_jfr_option = true;
267 return Jfr::on_start_flight_recording_option(option, tail);
268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_flight_recorder_option(option, tail);
271 }
272 return false;
273 }
274
275 bool Arguments::has_jfr_option() {
276 return _has_jfr_option;
277 }
278 #endif
279
280 static void logOption(const char* opt) {
281 if (PrintVMOptions) {
282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
283 }
284 }
285
286 bool needs_module_property_warning = false;
287
288 #define MODULE_PROPERTY_PREFIX "jdk.module."
289 #define MODULE_PROPERTY_PREFIX_LEN 11
290 #define ADDEXPORTS "addexports"
291 #define ADDEXPORTS_LEN 10
292 #define ADDREADS "addreads"
293 #define ADDREADS_LEN 8
294 #define ADDOPENS "addopens"
295 #define ADDOPENS_LEN 8
296 #define PATCH "patch"
297 #define PATCH_LEN 5
298 #define ADDMODS "addmods"
299 #define ADDMODS_LEN 7
300 #define LIMITMODS "limitmods"
301 #define LIMITMODS_LEN 9
302 #define PATH "path"
303 #define PATH_LEN 4
304 #define UPGRADE_PATH "upgrade.path"
305 #define UPGRADE_PATH_LEN 12
306 #define ENABLE_NATIVE_ACCESS "enable.native.access"
307 #define ENABLE_NATIVE_ACCESS_LEN 20
308
309 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
310 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
311 return ((strncmp(option, property, len) == 0) &&
312 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
313 }
314
315 // Return true if property starts with "jdk.module." and its ensuing chars match
316 // any of the reserved module properties.
317 // property should be passed without the leading "-D".
318 bool Arguments::is_internal_module_property(const char* property) {
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 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
501 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
502 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
503 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
504 { "RegisterFinalizersAtInit", JDK_Version::jdk(22), JDK_Version::jdk(23), JDK_Version::jdk(24) },
505
506 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
507 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
508
509 // -------------- Obsolete Flags - sorted by expired_in --------------
510
511 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
512 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
513 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
514 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
515 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
516 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
517
518 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
519 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
520 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
521 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
522
523 { "AdaptiveSizePolicyCollectionCostMargin", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
524 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
525 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
526 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
527 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
528 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
529 { "TLABStats", JDK_Version::jdk(12), JDK_Version::jdk(23), JDK_Version::jdk(24) },
530 #ifdef ASSERT
531 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
532 #endif
533
534 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
535 // These entries will generate build errors. Their purpose is to test the macros.
536 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
537 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
538 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
539 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
540 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
541 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
542 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
543 #endif
544
545 { nullptr, JDK_Version(0), JDK_Version(0) }
546 };
547
548 // Flags that are aliases for other flags.
549 typedef struct {
550 const char* alias_name;
551 const char* real_name;
552 } AliasedFlag;
553
554 static AliasedFlag const aliased_jvm_flags[] = {
555 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
556 { nullptr, nullptr}
557 };
558
559 // Return true if "v" is less than "other", where "other" may be "undefined".
560 static bool version_less_than(JDK_Version v, JDK_Version other) {
561 assert(!v.is_undefined(), "must be defined");
562 if (!other.is_undefined() && v.compare(other) >= 0) {
563 return false;
564 } else {
565 return true;
566 }
567 }
568
569 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
570 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
571 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
572 flag = special_jvm_flags[i];
573 return true;
574 }
575 }
576 return false;
577 }
578
579 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
580 assert(version != nullptr, "Must provide a version buffer");
581 SpecialFlag flag;
582 if (lookup_special_flag(flag_name, flag)) {
583 if (!flag.obsolete_in.is_undefined()) {
584 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
585 *version = flag.obsolete_in;
586 // This flag may have been marked for obsoletion in this version, but we may not
587 // have actually removed it yet. Rather than ignoring it as soon as we reach
588 // this version we allow some time for the removal to happen. So if the flag
589 // still actually exists we process it as normal, but issue an adjusted warning.
590 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
591 if (real_flag != nullptr) {
592 char version_str[256];
593 version->to_string(version_str, sizeof(version_str));
594 warning("Temporarily processing option %s; support is scheduled for removal in %s",
595 flag_name, version_str);
596 return false;
597 }
598 return true;
599 }
600 }
601 }
602 return false;
603 }
604
605 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
606 assert(version != nullptr, "Must provide a version buffer");
607 SpecialFlag flag;
608 if (lookup_special_flag(flag_name, flag)) {
609 if (!flag.deprecated_in.is_undefined()) {
610 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
611 version_less_than(JDK_Version::current(), flag.expired_in)) {
612 *version = flag.deprecated_in;
613 return 1;
614 } else {
615 return -1;
616 }
617 }
618 }
619 return 0;
620 }
621
622 const char* Arguments::real_flag_name(const char *flag_name) {
623 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
624 const AliasedFlag& flag_status = aliased_jvm_flags[i];
625 if (strcmp(flag_status.alias_name, flag_name) == 0) {
626 return flag_status.real_name;
627 }
628 }
629 return flag_name;
630 }
631
632 #ifdef ASSERT
633 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
634 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
635 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
636 return true;
637 }
638 }
639 return false;
640 }
641
642 // Verifies the correctness of the entries in the special_jvm_flags table.
643 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
644 // version being earlier than the deprecation version, then a warning is issued
645 // and verification fails - by returning false. If it is detected that the table
646 // is out of date, with respect to the current version, then ideally a warning is
647 // issued but verification does not fail. This allows the VM to operate when the
648 // version is first updated, without needing to update all the impacted flags at
649 // the same time. In practice we can't issue the warning immediately when the version
650 // is updated as it occurs for every test and some tests are not prepared to handle
651 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
652 // if the check_globals flag is true, and in addition allow a grace period and only
653 // check for stale flags when we hit build 25 (which is far enough into the 6 month
654 // release cycle that all flag updates should have been processed, whilst still
655 // leaving time to make the change before RDP2).
656 // We use a gtest to call this, passing true, so that we can detect stale flags before
657 // the end of the release cycle.
658
659 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
660
661 bool Arguments::verify_special_jvm_flags(bool check_globals) {
662 bool success = true;
663 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
664 const SpecialFlag& flag = special_jvm_flags[i];
665 if (lookup_special_flag(flag.name, i)) {
666 warning("Duplicate special flag declaration \"%s\"", flag.name);
667 success = false;
668 }
669 if (flag.deprecated_in.is_undefined() &&
670 flag.obsolete_in.is_undefined()) {
671 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
672 success = false;
673 }
674
675 if (!flag.deprecated_in.is_undefined()) {
676 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
677 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
678 success = false;
679 }
680
681 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
682 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
683 success = false;
684 }
685 }
686
687 if (!flag.obsolete_in.is_undefined()) {
688 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
689 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
690 success = false;
691 }
692
693 // if flag has become obsolete it should not have a "globals" flag defined anymore.
694 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
695 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
696 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
697 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
698 success = false;
699 }
700 }
701
702 } else if (!flag.expired_in.is_undefined()) {
703 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
704 success = false;
705 }
706
707 if (!flag.expired_in.is_undefined()) {
708 // if flag has become expired it should not have a "globals" flag defined anymore.
709 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
710 !version_less_than(JDK_Version::current(), flag.expired_in)) {
711 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
712 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
713 success = false;
714 }
715 }
716 }
717 }
718 return success;
719 }
720 #endif
721
722 bool Arguments::atojulong(const char *s, julong* result) {
723 return parse_integer(s, result);
724 }
725
726 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
727 if (size < min_size) return arg_too_small;
728 if (size > max_size) return arg_too_big;
729 return arg_in_range;
730 }
731
732 // Describe an argument out of range error
733 void Arguments::describe_range_error(ArgsRange errcode) {
734 switch(errcode) {
735 case arg_too_big:
736 jio_fprintf(defaultStream::error_stream(),
737 "The specified size exceeds the maximum "
738 "representable size.\n");
739 break;
740 case arg_too_small:
741 case arg_unreadable:
742 case arg_in_range:
743 // do nothing for now
744 break;
745 default:
746 ShouldNotReachHere();
747 }
748 }
749
750 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
751 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
752 return true;
753 } else {
754 return false;
755 }
756 }
757
758 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
759 // strtod allows leading whitespace, but our flag format does not.
760 if (*value == '\0' || isspace(*value)) {
761 return false;
762 }
763 char* end;
764 errno = 0;
765 double v = strtod(value, &end);
766 if ((errno != 0) || (*end != 0)) {
767 return false;
768 }
769 if (g_isnan(v) || !g_isfinite(v)) {
770 // Currently we cannot handle these special values.
771 return false;
772 }
773
774 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
775 return true;
776 }
777 return false;
778 }
779
780 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
781 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
782
783 if (flag->is_int()) {
784 int v;
785 if (parse_integer(value, &v)) {
786 result = JVMFlagAccess::set_int(flag, &v, origin);
787 }
788 } else if (flag->is_uint()) {
789 uint v;
790 if (parse_integer(value, &v)) {
791 result = JVMFlagAccess::set_uint(flag, &v, origin);
792 }
793 } else if (flag->is_intx()) {
794 intx v;
795 if (parse_integer(value, &v)) {
796 result = JVMFlagAccess::set_intx(flag, &v, origin);
797 }
798 } else if (flag->is_uintx()) {
799 uintx v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_uintx(flag, &v, origin);
802 }
803 } else if (flag->is_uint64_t()) {
804 uint64_t v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
807 }
808 } else if (flag->is_size_t()) {
809 size_t v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_size_t(flag, &v, origin);
812 }
813 }
814
815 return result == JVMFlag::SUCCESS;
816 }
817
818 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
819 if (value[0] == '\0') {
820 value = nullptr;
821 }
822 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
823 // Contract: JVMFlag always returns a pointer that needs freeing.
824 FREE_C_HEAP_ARRAY(char, value);
825 return true;
826 }
827
828 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
829 const char* old_value = "";
830 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
831 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
832 size_t new_len = strlen(new_value);
833 const char* value;
834 char* free_this_too = nullptr;
835 if (old_len == 0) {
836 value = new_value;
837 } else if (new_len == 0) {
838 value = old_value;
839 } else {
840 size_t length = old_len + 1 + new_len + 1;
841 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
842 // each new setting adds another LINE to the switch:
843 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
844 value = buf;
845 free_this_too = buf;
846 }
847 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
848 // JVMFlag always returns a pointer that needs freeing.
849 FREE_C_HEAP_ARRAY(char, value);
850 // JVMFlag made its own copy, so I must delete my own temp. buffer.
851 FREE_C_HEAP_ARRAY(char, free_this_too);
852 return true;
853 }
854
855 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
856 const char* real_name = real_flag_name(arg);
857 JDK_Version since = JDK_Version();
858 switch (is_deprecated_flag(arg, &since)) {
859 case -1: {
860 // Obsolete or expired, so don't process normally,
861 // but allow for an obsolete flag we're still
862 // temporarily allowing.
863 if (!is_obsolete_flag(arg, &since)) {
864 return real_name;
865 }
866 // Note if we're not considered obsolete then we can't be expired either
867 // as obsoletion must come first.
868 return nullptr;
869 }
870 case 0:
871 return real_name;
872 case 1: {
873 char version[256];
874 since.to_string(version, sizeof(version));
875 if (real_name != arg) {
876 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
877 arg, version, real_name);
878 } else {
879 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
880 arg, version);
881 }
882 return real_name;
883 }
884 }
885 ShouldNotReachHere();
886 return nullptr;
887 }
888
889 #define BUFLEN 255
890
891 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
892 char name_copied[BUFLEN+1];
893 if (name[name_length] != 0) {
894 if (name_length > BUFLEN) {
895 return nullptr;
896 } else {
897 strncpy(name_copied, name, name_length);
898 name_copied[name_length] = '\0';
899 name = name_copied;
900 }
901 }
902
903 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
904 if (real_name == nullptr) {
905 return nullptr;
906 }
907 JVMFlag* flag = JVMFlag::find_flag(real_name);
908 return flag;
909 }
910
911 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
912 bool is_bool = false;
913 bool bool_val = false;
914 char c = *arg;
915 if (c == '+' || c == '-') {
916 is_bool = true;
917 bool_val = (c == '+');
918 arg++;
919 }
920
921 const char* name = arg;
922 while (true) {
923 c = *arg;
924 if (isalnum(c) || (c == '_')) {
925 ++arg;
926 } else {
927 break;
928 }
929 }
930
931 size_t name_len = size_t(arg - name);
932 if (name_len == 0) {
933 return false;
934 }
935
936 JVMFlag* flag = find_jvm_flag(name, name_len);
937 if (flag == nullptr) {
938 return false;
939 }
940
941 if (is_bool) {
942 if (*arg != 0) {
943 // Error -- extra characters such as -XX:+BoolFlag=123
944 return false;
945 }
946 return set_bool_flag(flag, bool_val, origin);
947 }
948
949 if (arg[0] == '=') {
950 const char* value = arg + 1;
951 if (flag->is_ccstr()) {
952 if (flag->ccstr_accumulates()) {
953 return append_to_string_flag(flag, value, origin);
954 } else {
955 return set_string_flag(flag, value, origin);
956 }
957 } else if (flag->is_double()) {
958 return set_fp_numeric_flag(flag, value, origin);
959 } else {
960 return set_numeric_flag(flag, value, origin);
961 }
962 }
963
964 if (arg[0] == ':' && arg[1] == '=') {
965 // -XX:Foo:=xxx will reset the string flag to the given value.
966 const char* value = arg + 2;
967 return set_string_flag(flag, value, origin);
968 }
969
970 return false;
971 }
972
973 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
974 assert(bldarray != nullptr, "illegal argument");
975
976 if (arg == nullptr) {
977 return;
978 }
979
980 int new_count = *count + 1;
981
982 // expand the array and add arg to the last element
983 if (*bldarray == nullptr) {
984 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
985 } else {
986 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
987 }
988 (*bldarray)[*count] = os::strdup_check_oom(arg);
989 *count = new_count;
990 }
991
992 void Arguments::build_jvm_args(const char* arg) {
993 add_string(&_jvm_args_array, &_num_jvm_args, arg);
994 }
995
996 void Arguments::build_jvm_flags(const char* arg) {
997 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
998 }
999
1000 // utility function to return a string that concatenates all
1001 // strings in a given char** array
1002 const char* Arguments::build_resource_string(char** args, int count) {
1003 if (args == nullptr || count == 0) {
1004 return nullptr;
1005 }
1006 size_t length = 0;
1007 for (int i = 0; i < count; i++) {
1008 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1009 }
1010 char* s = NEW_RESOURCE_ARRAY(char, length);
1011 char* dst = s;
1012 for (int j = 0; j < count; j++) {
1013 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1014 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1015 dst += offset;
1016 length -= offset;
1017 }
1018 return (const char*) s;
1019 }
1020
1021 void Arguments::print_on(outputStream* st) {
1022 st->print_cr("VM Arguments:");
1023 if (num_jvm_flags() > 0) {
1024 st->print("jvm_flags: "); print_jvm_flags_on(st);
1025 st->cr();
1026 }
1027 if (num_jvm_args() > 0) {
1028 st->print("jvm_args: "); print_jvm_args_on(st);
1029 st->cr();
1030 }
1031 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1032 if (_java_class_path != nullptr) {
1033 char* path = _java_class_path->value();
1034 size_t len = strlen(path);
1035 st->print("java_class_path (initial): ");
1036 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1037 if (len == 0) {
1038 st->print_raw_cr("<not set>");
1039 } else {
1040 st->print_raw_cr(path, len);
1041 }
1042 }
1043 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1044 }
1045
1046 void Arguments::print_summary_on(outputStream* st) {
1047 // Print the command line. Environment variables that are helpful for
1048 // reproducing the problem are written later in the hs_err file.
1049 // flags are from setting file
1050 if (num_jvm_flags() > 0) {
1051 st->print_raw("Settings File: ");
1052 print_jvm_flags_on(st);
1053 st->cr();
1054 }
1055 // args are the command line and environment variable arguments.
1056 st->print_raw("Command Line: ");
1057 if (num_jvm_args() > 0) {
1058 print_jvm_args_on(st);
1059 }
1060 // this is the classfile and any arguments to the java program
1061 if (java_command() != nullptr) {
1062 st->print("%s", java_command());
1063 }
1064 st->cr();
1065 }
1066
1067 void Arguments::print_jvm_flags_on(outputStream* st) {
1068 if (_num_jvm_flags > 0) {
1069 for (int i=0; i < _num_jvm_flags; i++) {
1070 st->print("%s ", _jvm_flags_array[i]);
1071 }
1072 }
1073 }
1074
1075 void Arguments::print_jvm_args_on(outputStream* st) {
1076 if (_num_jvm_args > 0) {
1077 for (int i=0; i < _num_jvm_args; i++) {
1078 st->print("%s ", _jvm_args_array[i]);
1079 }
1080 }
1081 }
1082
1083 bool Arguments::process_argument(const char* arg,
1084 jboolean ignore_unrecognized,
1085 JVMFlagOrigin origin) {
1086 JDK_Version since = JDK_Version();
1087
1088 if (parse_argument(arg, origin)) {
1089 return true;
1090 }
1091
1092 // Determine if the flag has '+', '-', or '=' characters.
1093 bool has_plus_minus = (*arg == '+' || *arg == '-');
1094 const char* const argname = has_plus_minus ? arg + 1 : arg;
1095
1096 size_t arg_len;
1097 const char* equal_sign = strchr(argname, '=');
1098 if (equal_sign == nullptr) {
1099 arg_len = strlen(argname);
1100 } else {
1101 arg_len = equal_sign - argname;
1102 }
1103
1104 // Only make the obsolete check for valid arguments.
1105 if (arg_len <= BUFLEN) {
1106 // Construct a string which consists only of the argument name without '+', '-', or '='.
1107 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1108 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1109 if (is_obsolete_flag(stripped_argname, &since)) {
1110 char version[256];
1111 since.to_string(version, sizeof(version));
1112 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1113 return true;
1114 }
1115 }
1116
1117 // For locked flags, report a custom error message if available.
1118 // Otherwise, report the standard unrecognized VM option.
1119 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1120 if (found_flag != nullptr) {
1121 char locked_message_buf[BUFLEN];
1122 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1123 if (strlen(locked_message_buf) != 0) {
1124 #ifdef PRODUCT
1125 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1126 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1127 if (ignore_unrecognized && mismatched) {
1128 return true;
1129 }
1130 #endif
1131 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1132 }
1133 if (found_flag->is_bool() && !has_plus_minus) {
1134 jio_fprintf(defaultStream::error_stream(),
1135 "Missing +/- setting for VM option '%s'\n", argname);
1136 } else if (!found_flag->is_bool() && has_plus_minus) {
1137 jio_fprintf(defaultStream::error_stream(),
1138 "Unexpected +/- setting in VM option '%s'\n", argname);
1139 } else {
1140 jio_fprintf(defaultStream::error_stream(),
1141 "Improperly specified VM option '%s'\n", argname);
1142 }
1143 } else {
1144 if (ignore_unrecognized) {
1145 return true;
1146 }
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Unrecognized VM option '%s'\n", argname);
1149 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1150 if (fuzzy_matched != nullptr) {
1151 jio_fprintf(defaultStream::error_stream(),
1152 "Did you mean '%s%s%s'?\n",
1153 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1154 fuzzy_matched->name(),
1155 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1156 }
1157 }
1158
1159 // allow for commandline "commenting out" options like -XX:#+Verbose
1160 return arg[0] == '#';
1161 }
1162
1163 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1164 FILE* stream = os::fopen(file_name, "rb");
1165 if (stream == nullptr) {
1166 if (should_exist) {
1167 jio_fprintf(defaultStream::error_stream(),
1168 "Could not open settings file %s\n", file_name);
1169 return false;
1170 } else {
1171 return true;
1172 }
1173 }
1174
1175 char token[1024];
1176 int pos = 0;
1177
1178 bool in_white_space = true;
1179 bool in_comment = false;
1180 bool in_quote = false;
1181 int quote_c = 0;
1182 bool result = true;
1183
1184 int c = getc(stream);
1185 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1186 if (in_white_space) {
1187 if (in_comment) {
1188 if (c == '\n') in_comment = false;
1189 } else {
1190 if (c == '#') in_comment = true;
1191 else if (!isspace(c)) {
1192 in_white_space = false;
1193 token[pos++] = checked_cast<char>(c);
1194 }
1195 }
1196 } else {
1197 if (c == '\n' || (!in_quote && isspace(c))) {
1198 // token ends at newline, or at unquoted whitespace
1199 // this allows a way to include spaces in string-valued options
1200 token[pos] = '\0';
1201 logOption(token);
1202 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1203 build_jvm_flags(token);
1204 pos = 0;
1205 in_white_space = true;
1206 in_quote = false;
1207 } else if (!in_quote && (c == '\'' || c == '"')) {
1208 in_quote = true;
1209 quote_c = c;
1210 } else if (in_quote && (c == quote_c)) {
1211 in_quote = false;
1212 } else {
1213 token[pos++] = checked_cast<char>(c);
1214 }
1215 }
1216 c = getc(stream);
1217 }
1218 if (pos > 0) {
1219 token[pos] = '\0';
1220 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1221 build_jvm_flags(token);
1222 }
1223 fclose(stream);
1224 return result;
1225 }
1226
1227 //=============================================================================================================
1228 // Parsing of properties (-D)
1229
1230 const char* Arguments::get_property(const char* key) {
1231 return PropertyList_get_value(system_properties(), key);
1232 }
1233
1234 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1235 const char* eq = strchr(prop, '=');
1236 const char* key;
1237 const char* value = "";
1238
1239 if (eq == nullptr) {
1240 // property doesn't have a value, thus use passed string
1241 key = prop;
1242 } else {
1243 // property have a value, thus extract it and save to the
1244 // allocated string
1245 size_t key_len = eq - prop;
1246 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1247
1248 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1249 key = tmp_key;
1250
1251 value = &prop[key_len + 1];
1252 }
1253
1254 CDSConfig::check_system_property(key, value);
1255
1256 if (strcmp(key, "java.compiler") == 0) {
1257 // we no longer support java.compiler system property, log a warning and let it get
1258 // passed to Java, like any other system property
1259 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1260 // for applications using NONE or empty value, log a more informative message
1261 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1262 } else {
1263 warning("The java.compiler system property is obsolete and no longer supported.");
1264 }
1265 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1266 // sun.java.launcher.is_altjvm property is
1267 // private and is processed in process_sun_java_launcher_properties();
1268 // the sun.java.launcher property is passed on to the java application
1269 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1270 // append is true, writable is true, internal is false
1271 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1272 WriteableProperty, ExternalProperty);
1273 } else {
1274 if (strcmp(key, "sun.java.command") == 0) {
1275 char *old_java_command = _java_command;
1276 _java_command = os::strdup_check_oom(value, mtArguments);
1277 if (old_java_command != nullptr) {
1278 os::free(old_java_command);
1279 }
1280 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1281 // If this property is set on the command line then its value will be
1282 // displayed in VM error logs as the URL at which to submit such logs.
1283 // Normally the URL displayed in error logs is different from the value
1284 // of this system property, so a different property should have been
1285 // used here, but we leave this as-is in case someone depends upon it.
1286 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1287 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1288 // its value without going through the property list or making a Java call.
1289 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1290 if (old_java_vendor_url_bug != nullptr) {
1291 os::free((void *)old_java_vendor_url_bug);
1292 }
1293 }
1294
1295 // Create new property and add at the end of the list
1296 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1297 }
1298
1299 if (key != prop) {
1300 // SystemProperty copy passed value, thus free previously allocated
1301 // memory
1302 FreeHeap((void *)key);
1303 }
1304
1305 return true;
1306 }
1307
1308 //===========================================================================================================
1309 // Setting int/mixed/comp mode flags
1310
1311 void Arguments::set_mode_flags(Mode mode) {
1312 // Set up default values for all flags.
1313 // If you add a flag to any of the branches below,
1314 // add a default value for it here.
1315 _mode = mode;
1316
1317 // Ensure Agent_OnLoad has the correct initial values.
1318 // This may not be the final mode; mode may change later in onload phase.
1319 PropertyList_unique_add(&_system_properties, "java.vm.info",
1320 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1321
1322 UseInterpreter = true;
1323 UseCompiler = true;
1324 UseLoopCounter = true;
1325
1326 // Default values may be platform/compiler dependent -
1327 // use the saved values
1328 ClipInlining = Arguments::_ClipInlining;
1329 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1330 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1331 BackgroundCompilation = Arguments::_BackgroundCompilation;
1332
1333 // Change from defaults based on mode
1334 switch (mode) {
1335 default:
1336 ShouldNotReachHere();
1337 break;
1338 case _int:
1339 UseCompiler = false;
1340 UseLoopCounter = false;
1341 AlwaysCompileLoopMethods = false;
1342 UseOnStackReplacement = false;
1343 break;
1344 case _mixed:
1345 // same as default
1346 break;
1347 case _comp:
1348 UseInterpreter = false;
1349 BackgroundCompilation = false;
1350 ClipInlining = false;
1351 break;
1352 }
1353 }
1354
1355 // Conflict: required to use shared spaces (-Xshare:on), but
1356 // incompatible command line options were chosen.
1357 void Arguments::no_shared_spaces(const char* message) {
1358 if (RequireSharedSpaces) {
1359 jio_fprintf(defaultStream::error_stream(),
1360 "Class data sharing is inconsistent with other specified options.\n");
1361 vm_exit_during_initialization("Unable to use shared archive", message);
1362 } else {
1363 log_info(cds)("Unable to use shared archive: %s", message);
1364 UseSharedSpaces = false;
1365 }
1366 }
1367
1368 static void set_object_alignment() {
1369 // Object alignment.
1370 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1371 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1372 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1373 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1374 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1375 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1376
1377 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1378 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1379
1380 // Oop encoding heap max
1381 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1382 }
1383
1384 size_t Arguments::max_heap_for_compressed_oops() {
1385 // Avoid sign flip.
1386 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1387 // We need to fit both the null page and the heap into the memory budget, while
1388 // keeping alignment constraints of the heap. To guarantee the latter, as the
1389 // null page is located before the heap, we pad the null page to the conservative
1390 // maximum alignment that the GC may ever impose upon the heap.
1391 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1392 _conservative_max_heap_alignment);
1393
1394 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1395 NOT_LP64(ShouldNotReachHere(); return 0);
1396 }
1397
1398 void Arguments::set_use_compressed_oops() {
1399 #ifdef _LP64
1400 // MaxHeapSize is not set up properly at this point, but
1401 // the only value that can override MaxHeapSize if we are
1402 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1403 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1404
1405 if (max_heap_size <= max_heap_for_compressed_oops()) {
1406 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1407 FLAG_SET_ERGO(UseCompressedOops, true);
1408 }
1409 } else {
1410 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1411 warning("Max heap size too large for Compressed Oops");
1412 FLAG_SET_DEFAULT(UseCompressedOops, false);
1413 }
1414 }
1415 #endif // _LP64
1416 }
1417
1418 void Arguments::set_use_compressed_klass_ptrs() {
1419 #ifdef _LP64
1420 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1421 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1422 #endif // _LP64
1423 }
1424
1425 void Arguments::set_conservative_max_heap_alignment() {
1426 // The conservative maximum required alignment for the heap is the maximum of
1427 // the alignments imposed by several sources: any requirements from the heap
1428 // itself and the maximum page size we may run the VM with.
1429 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1430 _conservative_max_heap_alignment = MAX4(heap_alignment,
1431 os::vm_allocation_granularity(),
1432 os::max_page_size(),
1433 GCArguments::compute_heap_alignment());
1434 }
1435
1436 jint Arguments::set_ergonomics_flags() {
1437 GCConfig::initialize();
1438
1439 set_conservative_max_heap_alignment();
1440
1441 #ifdef _LP64
1442 set_use_compressed_oops();
1443 set_use_compressed_klass_ptrs();
1444
1445 // Also checks that certain machines are slower with compressed oops
1446 // in vm_version initialization code.
1447 #endif // _LP64
1448
1449 return JNI_OK;
1450 }
1451
1452 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1453 size_t max_allocatable;
1454 size_t result = limit;
1455 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1456 // The AggressiveHeap check is a temporary workaround to avoid calling
1457 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1458 // selected. This works because AggressiveHeap implies UseParallelGC
1459 // where we know the ratio will be 1. Once the AggressiveHeap option is
1460 // removed, this can be cleaned up.
1461 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1462 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1463 result = MIN2(result, max_allocatable / fraction);
1464 }
1465 return result;
1466 }
1467
1468 // Use static initialization to get the default before parsing
1469 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1470
1471 void Arguments::set_heap_size() {
1472 julong phys_mem;
1473
1474 // If the user specified one of these options, they
1475 // want specific memory sizing so do not limit memory
1476 // based on compressed oops addressability.
1477 // Also, memory limits will be calculated based on
1478 // available os physical memory, not our MaxRAM limit,
1479 // unless MaxRAM is also specified.
1480 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1481 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1482 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1483 !FLAG_IS_DEFAULT(MaxRAM));
1484 if (override_coop_limit) {
1485 if (FLAG_IS_DEFAULT(MaxRAM)) {
1486 phys_mem = os::physical_memory();
1487 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1488 } else {
1489 phys_mem = (julong)MaxRAM;
1490 }
1491 } else {
1492 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1493 : (julong)MaxRAM;
1494 }
1495
1496 // If the maximum heap size has not been set with -Xmx,
1497 // then set it as fraction of the size of physical memory,
1498 // respecting the maximum and minimum sizes of the heap.
1499 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1500 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1501 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1502 if (reasonable_min < MaxHeapSize) {
1503 // Small physical memory, so use a minimum fraction of it for the heap
1504 reasonable_max = reasonable_min;
1505 } else {
1506 // Not-small physical memory, so require a heap at least
1507 // as large as MaxHeapSize
1508 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1509 }
1510
1511 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1512 // Limit the heap size to ErgoHeapSizeLimit
1513 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1514 }
1515
1516 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1517
1518 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1519 // An initial heap size was specified on the command line,
1520 // so be sure that the maximum size is consistent. Done
1521 // after call to limit_heap_by_allocatable_memory because that
1522 // method might reduce the allocation size.
1523 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1524 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1525 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1526 }
1527
1528 #ifdef _LP64
1529 if (UseCompressedOops || UseCompressedClassPointers) {
1530 // HeapBaseMinAddress can be greater than default but not less than.
1531 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1532 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1533 // matches compressed oops printing flags
1534 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1535 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1536 DefaultHeapBaseMinAddress,
1537 DefaultHeapBaseMinAddress/G,
1538 HeapBaseMinAddress);
1539 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1540 }
1541 }
1542 }
1543 if (UseCompressedOops) {
1544 // Limit the heap size to the maximum possible when using compressed oops
1545 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1546
1547 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1548 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1549 // but it should be not less than default MaxHeapSize.
1550 max_coop_heap -= HeapBaseMinAddress;
1551 }
1552
1553 // If user specified flags prioritizing os physical
1554 // memory limits, then disable compressed oops if
1555 // limits exceed max_coop_heap and UseCompressedOops
1556 // was not specified.
1557 if (reasonable_max > max_coop_heap) {
1558 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1559 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1560 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1561 "Please check the setting of MaxRAMPercentage %5.2f."
1562 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1563 FLAG_SET_ERGO(UseCompressedOops, false);
1564 } else {
1565 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1566 }
1567 }
1568 }
1569 #endif // _LP64
1570
1571 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1572 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1573 }
1574
1575 // If the minimum or initial heap_size have not been set or requested to be set
1576 // ergonomically, set them accordingly.
1577 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1578 julong reasonable_minimum = (julong)(OldSize + NewSize);
1579
1580 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1581
1582 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1583
1584 if (InitialHeapSize == 0) {
1585 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1586 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1587
1588 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1589 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1590
1591 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1592 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1593 }
1594 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1595 // synchronize with InitialHeapSize to avoid errors with the default value.
1596 if (MinHeapSize == 0) {
1597 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1598 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1599 }
1600 }
1601 }
1602
1603 // This option inspects the machine and attempts to set various
1604 // parameters to be optimal for long-running, memory allocation
1605 // intensive jobs. It is intended for machines with large
1606 // amounts of cpu and memory.
1607 jint Arguments::set_aggressive_heap_flags() {
1608 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1609 // VM, but we may not be able to represent the total physical memory
1610 // available (like having 8gb of memory on a box but using a 32bit VM).
1611 // Thus, we need to make sure we're using a julong for intermediate
1612 // calculations.
1613 julong initHeapSize;
1614 julong total_memory = os::physical_memory();
1615
1616 if (total_memory < (julong) 256 * M) {
1617 jio_fprintf(defaultStream::error_stream(),
1618 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1619 vm_exit(1);
1620 }
1621
1622 // The heap size is half of available memory, or (at most)
1623 // all of possible memory less 160mb (leaving room for the OS
1624 // when using ISM). This is the maximum; because adaptive sizing
1625 // is turned on below, the actual space used may be smaller.
1626
1627 initHeapSize = MIN2(total_memory / (julong) 2,
1628 total_memory - (julong) 160 * M);
1629
1630 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1631
1632 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1633 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1634 return JNI_EINVAL;
1635 }
1636 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1637 return JNI_EINVAL;
1638 }
1639 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1640 return JNI_EINVAL;
1641 }
1642 }
1643 if (FLAG_IS_DEFAULT(NewSize)) {
1644 // Make the young generation 3/8ths of the total heap.
1645 if (FLAG_SET_CMDLINE(NewSize,
1646 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1647 return JNI_EINVAL;
1648 }
1649 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1650 return JNI_EINVAL;
1651 }
1652 }
1653
1654 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1655 FLAG_SET_DEFAULT(UseLargePages, true);
1656 #endif
1657
1658 // Increase some data structure sizes for efficiency
1659 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1660 return JNI_EINVAL;
1661 }
1662 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1663 return JNI_EINVAL;
1664 }
1665 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1666 return JNI_EINVAL;
1667 }
1668
1669 // See the OldPLABSize comment below, but replace 'after promotion'
1670 // with 'after copying'. YoungPLABSize is the size of the survivor
1671 // space per-gc-thread buffers. The default is 4kw.
1672 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1673 return JNI_EINVAL;
1674 }
1675
1676 // OldPLABSize is the size of the buffers in the old gen that
1677 // UseParallelGC uses to promote live data that doesn't fit in the
1678 // survivor spaces. At any given time, there's one for each gc thread.
1679 // The default size is 1kw. These buffers are rarely used, since the
1680 // survivor spaces are usually big enough. For specjbb, however, there
1681 // are occasions when there's lots of live data in the young gen
1682 // and we end up promoting some of it. We don't have a definite
1683 // explanation for why bumping OldPLABSize helps, but the theory
1684 // is that a bigger PLAB results in retaining something like the
1685 // original allocation order after promotion, which improves mutator
1686 // locality. A minor effect may be that larger PLABs reduce the
1687 // number of PLAB allocation events during gc. The value of 8kw
1688 // was arrived at by experimenting with specjbb.
1689 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1690 return JNI_EINVAL;
1691 }
1692
1693 // Enable parallel GC and adaptive generation sizing
1694 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1695 return JNI_EINVAL;
1696 }
1697
1698 // Encourage steady state memory management
1699 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1700 return JNI_EINVAL;
1701 }
1702
1703 // This appears to improve mutator locality
1704 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1705 return JNI_EINVAL;
1706 }
1707
1708 return JNI_OK;
1709 }
1710
1711 // This must be called after ergonomics.
1712 void Arguments::set_bytecode_flags() {
1713 if (!RewriteBytecodes) {
1714 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1715 }
1716 }
1717
1718 // Aggressive optimization flags
1719 jint Arguments::set_aggressive_opts_flags() {
1720 #ifdef COMPILER2
1721 if (AggressiveUnboxing) {
1722 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1723 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1724 } else if (!EliminateAutoBox) {
1725 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1726 AggressiveUnboxing = false;
1727 }
1728 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1729 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1730 } else if (!DoEscapeAnalysis) {
1731 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1732 AggressiveUnboxing = false;
1733 }
1734 }
1735 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1736 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1737 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1738 }
1739 // Feed the cache size setting into the JDK
1740 char buffer[1024];
1741 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1742 if (!add_property(buffer)) {
1743 return JNI_ENOMEM;
1744 }
1745 }
1746 #endif
1747
1748 return JNI_OK;
1749 }
1750
1751 //===========================================================================================================
1752
1753 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1754 if (_sun_java_launcher != _default_java_launcher) {
1755 os::free(const_cast<char*>(_sun_java_launcher));
1756 }
1757 _sun_java_launcher = os::strdup_check_oom(launcher);
1758 }
1759
1760 bool Arguments::created_by_java_launcher() {
1761 assert(_sun_java_launcher != nullptr, "property must have value");
1762 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1763 }
1764
1765 bool Arguments::sun_java_launcher_is_altjvm() {
1766 return _sun_java_launcher_is_altjvm;
1767 }
1768
1769 //===========================================================================================================
1770 // Parsing of main arguments
1771
1772 unsigned int addreads_count = 0;
1773 unsigned int addexports_count = 0;
1774 unsigned int addopens_count = 0;
1775 unsigned int addmods_count = 0;
1776 unsigned int enable_native_access_count = 0;
1777
1778 // Check the consistency of vm_init_args
1779 bool Arguments::check_vm_args_consistency() {
1780 // Method for adding checks for flag consistency.
1781 // The intent is to warn the user of all possible conflicts,
1782 // before returning an error.
1783 // Note: Needs platform-dependent factoring.
1784 bool status = true;
1785
1786 if (TLABRefillWasteFraction == 0) {
1787 jio_fprintf(defaultStream::error_stream(),
1788 "TLABRefillWasteFraction should be a denominator, "
1789 "not " SIZE_FORMAT "\n",
1790 TLABRefillWasteFraction);
1791 status = false;
1792 }
1793
1794 status = CompilerConfig::check_args_consistency(status);
1795 #if INCLUDE_JVMCI
1796 if (status && EnableJVMCI) {
1797 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1798 AddProperty, UnwriteableProperty, InternalProperty);
1799 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1800 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1801 return false;
1802 }
1803 }
1804 }
1805 #endif
1806
1807 #if INCLUDE_JFR
1808 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1809 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1810 return false;
1811 }
1812 }
1813 #endif
1814
1815 #ifndef SUPPORT_RESERVED_STACK_AREA
1816 if (StackReservedPages != 0) {
1817 FLAG_SET_CMDLINE(StackReservedPages, 0);
1818 warning("Reserved Stack Area not supported on this platform");
1819 }
1820 #endif
1821
1822 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) {
1823 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false);
1824 warning("InlineTypePassFieldsAsArgs is not supported on this platform");
1825 }
1826
1827 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) {
1828 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false);
1829 warning("InlineTypeReturnedAsFields is not supported on this platform");
1830 }
1831
1832 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1833 if (LockingMode == LM_LIGHTWEIGHT) {
1834 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1835 warning("New lightweight locking not supported on this platform");
1836 }
1837 #endif
1838
1839 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1840 if (LockingMode == LM_MONITOR) {
1841 jio_fprintf(defaultStream::error_stream(),
1842 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1843 return false;
1844 }
1845 #endif
1846 #if defined(X86) && !defined(ZERO)
1847 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1848 jio_fprintf(defaultStream::error_stream(),
1849 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n");
1850
1851 return false;
1852 }
1853 #endif
1854 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1855 jio_fprintf(defaultStream::error_stream(),
1856 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1857 return false;
1858 }
1859 return status;
1860 }
1861
1862 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1863 const char* option_type) {
1864 if (ignore) return false;
1865
1866 const char* spacer = " ";
1867 if (option_type == nullptr) {
1868 option_type = ++spacer; // Set both to the empty string.
1869 }
1870
1871 jio_fprintf(defaultStream::error_stream(),
1872 "Unrecognized %s%soption: %s\n", option_type, spacer,
1873 option->optionString);
1874 return true;
1875 }
1876
1877 static const char* user_assertion_options[] = {
1878 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1879 };
1880
1881 static const char* system_assertion_options[] = {
1882 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1883 };
1884
1885 bool Arguments::parse_uint(const char* value,
1886 uint* uint_arg,
1887 uint min_size) {
1888 uint n;
1889 if (!parse_integer(value, &n)) {
1890 return false;
1891 }
1892 if (n >= min_size) {
1893 *uint_arg = n;
1894 return true;
1895 } else {
1896 return false;
1897 }
1898 }
1899
1900 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1901 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1902 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1903 char* property = AllocateHeap(prop_len, mtArguments);
1904 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1905 if (ret < 0 || ret >= (int)prop_len) {
1906 FreeHeap(property);
1907 return false;
1908 }
1909 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1910 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1911 // that multiple occurrences of the associated flag just causes the existing property value to be
1912 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1913 // to a property after we have finished flag processing.
1914 bool added = add_property(property, WriteableProperty, internal);
1915 FreeHeap(property);
1916 return added;
1917 }
1918
1919 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1920 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1921 const unsigned int props_count_limit = 1000;
1922 const int max_digits = 3;
1923 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1924
1925 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1926 if (count < props_count_limit) {
1927 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1928 char* property = AllocateHeap(prop_len, mtArguments);
1929 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1930 if (ret < 0 || ret >= (int)prop_len) {
1931 FreeHeap(property);
1932 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1933 return false;
1934 }
1935 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1936 FreeHeap(property);
1937 return added;
1938 }
1939
1940 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1941 return false;
1942 }
1943
1944 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1945 julong* long_arg,
1946 julong min_size,
1947 julong max_size) {
1948 if (!parse_integer(s, long_arg)) return arg_unreadable;
1949 return check_memory_size(*long_arg, min_size, max_size);
1950 }
1951
1952 // Parse JavaVMInitArgs structure
1953
1954 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1955 const JavaVMInitArgs *java_tool_options_args,
1956 const JavaVMInitArgs *java_options_args,
1957 const JavaVMInitArgs *cmd_line_args) {
1958 // Save default settings for some mode flags
1959 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1960 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1961 Arguments::_ClipInlining = ClipInlining;
1962 Arguments::_BackgroundCompilation = BackgroundCompilation;
1963
1964 // Remember the default value of SharedBaseAddress.
1965 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1966
1967 // Setup flags for mixed which is the default
1968 set_mode_flags(_mixed);
1969
1970 // Parse args structure generated from java.base vm options resource
1971 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1972 if (result != JNI_OK) {
1973 return result;
1974 }
1975
1976 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1977 // variable (if present).
1978 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1979 if (result != JNI_OK) {
1980 return result;
1981 }
1982
1983 // Parse args structure generated from the command line flags.
1984 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1985 if (result != JNI_OK) {
1986 return result;
1987 }
1988
1989 // Parse args structure generated from the _JAVA_OPTIONS environment
1990 // variable (if present) (mimics classic VM)
1991 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1992 if (result != JNI_OK) {
1993 return result;
1994 }
1995
1996 // Disable CDS for exploded image
1997 if (!has_jimage()) {
1998 no_shared_spaces("CDS disabled on exploded JDK");
1999 }
2000
2001 // We need to ensure processor and memory resources have been properly
2002 // configured - which may rely on arguments we just processed - before
2003 // doing the final argument processing. Any argument processing that
2004 // needs to know about processor and memory resources must occur after
2005 // this point.
2006
2007 os::init_container_support();
2008
2009 SystemMemoryBarrier::initialize();
2010
2011 // Do final processing now that all arguments have been parsed
2012 result = finalize_vm_init_args();
2013 if (result != JNI_OK) {
2014 return result;
2015 }
2016
2017 return JNI_OK;
2018 }
2019
2020 #if !INCLUDE_JVMTI
2021 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2022 // represents a valid JDWP agent. is_path==true denotes that we
2023 // are dealing with -agentpath (case where name is a path), otherwise with
2024 // -agentlib
2025 static bool valid_jdwp_agent(char *name, bool is_path) {
2026 char *_name;
2027 const char *_jdwp = "jdwp";
2028 size_t _len_jdwp, _len_prefix;
2029
2030 if (is_path) {
2031 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2032 return false;
2033 }
2034
2035 _name++; // skip past last path separator
2036 _len_prefix = strlen(JNI_LIB_PREFIX);
2037
2038 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2039 return false;
2040 }
2041
2042 _name += _len_prefix;
2043 _len_jdwp = strlen(_jdwp);
2044
2045 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2046 _name += _len_jdwp;
2047 }
2048 else {
2049 return false;
2050 }
2051
2052 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2053 return false;
2054 }
2055
2056 return true;
2057 }
2058
2059 if (strcmp(name, _jdwp) == 0) {
2060 return true;
2061 }
2062
2063 return false;
2064 }
2065 #endif
2066
2067 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2068 // --patch-module=<module>=<file>(<pathsep><file>)*
2069 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2070 // Find the equal sign between the module name and the path specification
2071 const char* module_equal = strchr(patch_mod_tail, '=');
2072 if (module_equal == nullptr) {
2073 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2074 return JNI_ERR;
2075 } else {
2076 // Pick out the module name
2077 size_t module_len = module_equal - patch_mod_tail;
2078 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2079 if (module_name != nullptr) {
2080 memcpy(module_name, patch_mod_tail, module_len);
2081 *(module_name + module_len) = '\0';
2082 // The path piece begins one past the module_equal sign
2083 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2084 FREE_C_HEAP_ARRAY(char, module_name);
2085 } else {
2086 return JNI_ENOMEM;
2087 }
2088 }
2089 return JNI_OK;
2090 }
2091
2092 // VALUECLASS_STR must match string used in the build
2093 #define VALUECLASS_STR "valueclasses"
2094 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2095
2096 // Finalize --patch-module args and --enable-preview related to value class module patches.
2097 // Create all numbered properties passing module patches.
2098 int Arguments::finalize_patch_module() {
2099 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2100 // are to be patched into the module.
2101 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2102 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2103 if (enable_preview() && EnableValhalla) {
2104 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2105 const char * fileSep = os::file_separator();
2106
2107 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2108 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2109 DIR* dir = os::opendir(valueclasses_dir);
2110 if (dir != nullptr) {
2111 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2112 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2113
2114 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2115 // Test if file ends-with "-valueclasses.jar"
2116 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2117 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2118 continue; // too short or not the expected suffix
2119 }
2120
2121 strcpy(module_name, entry->d_name);
2122 module_name[len] = '\0'; // truncate to just module-name
2123
2124 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2125 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2126 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2127 }
2128 FreeHeap(module_name);
2129 FreeHeap(path);
2130 os::closedir(dir);
2131 }
2132 FreeHeap(valueclasses_dir);
2133 }
2134
2135 // Create numbered properties for each module that has been patched either
2136 // by --patch-module or --enable-preview
2137 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2138 if (_patch_mod_prefix != nullptr) {
2139 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2140 unsigned int patch_mod_count = 0;
2141
2142 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2143 it != _patch_mod_prefix->end(); ++it) {
2144 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2145 (*it)->module_name(), (*it)->path_string());
2146 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2147 FreeHeap(prop_value);
2148 return JNI_ENOMEM;
2149 }
2150 }
2151 FreeHeap(prop_value);
2152 }
2153 return JNI_OK;
2154 }
2155
2156 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2157 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2158 // The min and max sizes match the values in globals.hpp, but scaled
2159 // with K. The values have been chosen so that alignment with page
2160 // size doesn't change the max value, which makes the conversions
2161 // back and forth between Xss value and ThreadStackSize value easier.
2162 // The values have also been chosen to fit inside a 32-bit signed type.
2163 const julong min_ThreadStackSize = 0;
2164 const julong max_ThreadStackSize = 1 * M;
2165
2166 // Make sure the above values match the range set in globals.hpp
2167 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2168 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2169 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2170
2171 const julong min_size = min_ThreadStackSize * K;
2172 const julong max_size = max_ThreadStackSize * K;
2173
2174 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2175
2176 julong size = 0;
2177 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2178 if (errcode != arg_in_range) {
2179 bool silent = (option == nullptr); // Allow testing to silence error messages
2180 if (!silent) {
2181 jio_fprintf(defaultStream::error_stream(),
2182 "Invalid thread stack size: %s\n", option->optionString);
2183 describe_range_error(errcode);
2184 }
2185 return JNI_EINVAL;
2186 }
2187
2188 // Internally track ThreadStackSize in units of 1024 bytes.
2189 const julong size_aligned = align_up(size, K);
2190 assert(size <= size_aligned,
2191 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2192 size, size_aligned);
2193
2194 const julong size_in_K = size_aligned / K;
2195 assert(size_in_K < (julong)max_intx,
2196 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2197 size_in_K);
2198
2199 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2200 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2201 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2202 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2203 max_expanded, size_in_K);
2204
2205 *out_ThreadStackSize = (intx)size_in_K;
2206
2207 return JNI_OK;
2208 }
2209
2210 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2211 // For match_option to return remaining or value part of option string
2212 const char* tail;
2213
2214 // iterate over arguments
2215 for (int index = 0; index < args->nOptions; index++) {
2216 bool is_absolute_path = false; // for -agentpath vs -agentlib
2217
2218 const JavaVMOption* option = args->options + index;
2219
2220 if (!match_option(option, "-Djava.class.path", &tail) &&
2221 !match_option(option, "-Dsun.java.command", &tail) &&
2222 !match_option(option, "-Dsun.java.launcher", &tail)) {
2223
2224 // add all jvm options to the jvm_args string. This string
2225 // is used later to set the java.vm.args PerfData string constant.
2226 // the -Djava.class.path and the -Dsun.java.command options are
2227 // omitted from jvm_args string as each have their own PerfData
2228 // string constant object.
2229 build_jvm_args(option->optionString);
2230 }
2231
2232 // -verbose:[class/module/gc/jni]
2233 if (match_option(option, "-verbose", &tail)) {
2234 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2235 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2236 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2237 } else if (!strcmp(tail, ":module")) {
2238 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2239 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2240 } else if (!strcmp(tail, ":gc")) {
2241 if (_legacyGCLogging.lastFlag == 0) {
2242 _legacyGCLogging.lastFlag = 1;
2243 }
2244 } else if (!strcmp(tail, ":jni")) {
2245 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2246 }
2247 // -da / -ea / -disableassertions / -enableassertions
2248 // These accept an optional class/package name separated by a colon, e.g.,
2249 // -da:java.lang.Thread.
2250 } else if (match_option(option, user_assertion_options, &tail, true)) {
2251 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2252 if (*tail == '\0') {
2253 JavaAssertions::setUserClassDefault(enable);
2254 } else {
2255 assert(*tail == ':', "bogus match by match_option()");
2256 JavaAssertions::addOption(tail + 1, enable);
2257 }
2258 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2259 } else if (match_option(option, system_assertion_options, &tail, false)) {
2260 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2261 JavaAssertions::setSystemClassDefault(enable);
2262 // -bootclasspath:
2263 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2264 jio_fprintf(defaultStream::output_stream(),
2265 "-Xbootclasspath is no longer a supported option.\n");
2266 return JNI_EINVAL;
2267 // -bootclasspath/a:
2268 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2269 Arguments::append_sysclasspath(tail);
2270 // -bootclasspath/p:
2271 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2272 jio_fprintf(defaultStream::output_stream(),
2273 "-Xbootclasspath/p is no longer a supported option.\n");
2274 return JNI_EINVAL;
2275 // -Xrun
2276 } else if (match_option(option, "-Xrun", &tail)) {
2277 if (tail != nullptr) {
2278 const char* pos = strchr(tail, ':');
2279 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2280 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2281 jio_snprintf(name, len + 1, "%s", tail);
2282
2283 char *options = nullptr;
2284 if(pos != nullptr) {
2285 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2286 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2287 }
2288 #if !INCLUDE_JVMTI
2289 if (strcmp(name, "jdwp") == 0) {
2290 jio_fprintf(defaultStream::error_stream(),
2291 "Debugging agents are not supported in this VM\n");
2292 return JNI_ERR;
2293 }
2294 #endif // !INCLUDE_JVMTI
2295 JvmtiAgentList::add_xrun(name, options, false);
2296 FREE_C_HEAP_ARRAY(char, name);
2297 FREE_C_HEAP_ARRAY(char, options);
2298 }
2299 } else if (match_option(option, "--add-reads=", &tail)) {
2300 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2301 return JNI_ENOMEM;
2302 }
2303 } else if (match_option(option, "--add-exports=", &tail)) {
2304 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2305 return JNI_ENOMEM;
2306 }
2307 } else if (match_option(option, "--add-opens=", &tail)) {
2308 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2309 return JNI_ENOMEM;
2310 }
2311 } else if (match_option(option, "--add-modules=", &tail)) {
2312 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2313 return JNI_ENOMEM;
2314 }
2315 } else if (match_option(option, "--enable-native-access=", &tail)) {
2316 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2317 return JNI_ENOMEM;
2318 }
2319 } else if (match_option(option, "--limit-modules=", &tail)) {
2320 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2321 return JNI_ENOMEM;
2322 }
2323 } else if (match_option(option, "--module-path=", &tail)) {
2324 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2325 return JNI_ENOMEM;
2326 }
2327 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2328 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2329 return JNI_ENOMEM;
2330 }
2331 } else if (match_option(option, "--patch-module=", &tail)) {
2332 // --patch-module=<module>=<file>(<pathsep><file>)*
2333 int res = process_patch_mod_option(tail);
2334 if (res != JNI_OK) {
2335 return res;
2336 }
2337 } else if (match_option(option, "--illegal-access=", &tail)) {
2338 char version[256];
2339 JDK_Version::jdk(17).to_string(version, sizeof(version));
2340 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2341 // -agentlib and -agentpath
2342 } else if (match_option(option, "-agentlib:", &tail) ||
2343 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2344 if(tail != nullptr) {
2345 const char* pos = strchr(tail, '=');
2346 char* name;
2347 if (pos == nullptr) {
2348 name = os::strdup_check_oom(tail, mtArguments);
2349 } else {
2350 size_t len = pos - tail;
2351 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2352 memcpy(name, tail, len);
2353 name[len] = '\0';
2354 }
2355
2356 char *options = nullptr;
2357 if(pos != nullptr) {
2358 options = os::strdup_check_oom(pos + 1, mtArguments);
2359 }
2360 #if !INCLUDE_JVMTI
2361 if (valid_jdwp_agent(name, is_absolute_path)) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "Debugging agents are not supported in this VM\n");
2364 return JNI_ERR;
2365 }
2366 #endif // !INCLUDE_JVMTI
2367 JvmtiAgentList::add(name, options, is_absolute_path);
2368 os::free(name);
2369 os::free(options);
2370 }
2371 // -javaagent
2372 } else if (match_option(option, "-javaagent:", &tail)) {
2373 #if !INCLUDE_JVMTI
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Instrumentation agents are not supported in this VM\n");
2376 return JNI_ERR;
2377 #else
2378 if (tail != nullptr) {
2379 size_t length = strlen(tail) + 1;
2380 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2381 jio_snprintf(options, length, "%s", tail);
2382 JvmtiAgentList::add("instrument", options, false);
2383 FREE_C_HEAP_ARRAY(char, options);
2384
2385 // java agents need module java.instrument
2386 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2387 return JNI_ENOMEM;
2388 }
2389 }
2390 #endif // !INCLUDE_JVMTI
2391 // --enable_preview
2392 } else if (match_option(option, "--enable-preview")) {
2393 set_enable_preview();
2394 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2395 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2396 return JNI_EINVAL;
2397 }
2398 // -Xnoclassgc
2399 } else if (match_option(option, "-Xnoclassgc")) {
2400 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2401 return JNI_EINVAL;
2402 }
2403 // -Xbatch
2404 } else if (match_option(option, "-Xbatch")) {
2405 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2406 return JNI_EINVAL;
2407 }
2408 // -Xmn for compatibility with other JVM vendors
2409 } else if (match_option(option, "-Xmn", &tail)) {
2410 julong long_initial_young_size = 0;
2411 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2412 if (errcode != arg_in_range) {
2413 jio_fprintf(defaultStream::error_stream(),
2414 "Invalid initial young generation size: %s\n", option->optionString);
2415 describe_range_error(errcode);
2416 return JNI_EINVAL;
2417 }
2418 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2419 return JNI_EINVAL;
2420 }
2421 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2422 return JNI_EINVAL;
2423 }
2424 // -Xms
2425 } else if (match_option(option, "-Xms", &tail)) {
2426 julong size = 0;
2427 // an initial heap size of 0 means automatically determine
2428 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2429 if (errcode != arg_in_range) {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Invalid initial heap size: %s\n", option->optionString);
2432 describe_range_error(errcode);
2433 return JNI_EINVAL;
2434 }
2435 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2436 return JNI_EINVAL;
2437 }
2438 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2439 return JNI_EINVAL;
2440 }
2441 // -Xmx
2442 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2443 julong long_max_heap_size = 0;
2444 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2445 if (errcode != arg_in_range) {
2446 jio_fprintf(defaultStream::error_stream(),
2447 "Invalid maximum heap size: %s\n", option->optionString);
2448 describe_range_error(errcode);
2449 return JNI_EINVAL;
2450 }
2451 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2452 return JNI_EINVAL;
2453 }
2454 // Xmaxf
2455 } else if (match_option(option, "-Xmaxf", &tail)) {
2456 char* err;
2457 int maxf = (int)(strtod(tail, &err) * 100);
2458 if (*err != '\0' || *tail == '\0') {
2459 jio_fprintf(defaultStream::error_stream(),
2460 "Bad max heap free percentage size: %s\n",
2461 option->optionString);
2462 return JNI_EINVAL;
2463 } else {
2464 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2465 return JNI_EINVAL;
2466 }
2467 }
2468 // Xminf
2469 } else if (match_option(option, "-Xminf", &tail)) {
2470 char* err;
2471 int minf = (int)(strtod(tail, &err) * 100);
2472 if (*err != '\0' || *tail == '\0') {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "Bad min heap free percentage size: %s\n",
2475 option->optionString);
2476 return JNI_EINVAL;
2477 } else {
2478 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2479 return JNI_EINVAL;
2480 }
2481 }
2482 // -Xss
2483 } else if (match_option(option, "-Xss", &tail)) {
2484 intx value = 0;
2485 jint err = parse_xss(option, tail, &value);
2486 if (err != JNI_OK) {
2487 return err;
2488 }
2489 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2490 return JNI_EINVAL;
2491 }
2492 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2493 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2494 julong long_ReservedCodeCacheSize = 0;
2495
2496 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2497 if (errcode != arg_in_range) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "Invalid maximum code cache size: %s.\n", option->optionString);
2500 return JNI_EINVAL;
2501 }
2502 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2503 return JNI_EINVAL;
2504 }
2505 // -green
2506 } else if (match_option(option, "-green")) {
2507 jio_fprintf(defaultStream::error_stream(),
2508 "Green threads support not available\n");
2509 return JNI_EINVAL;
2510 // -native
2511 } else if (match_option(option, "-native")) {
2512 // HotSpot always uses native threads, ignore silently for compatibility
2513 // -Xrs
2514 } else if (match_option(option, "-Xrs")) {
2515 // Classic/EVM option, new functionality
2516 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2517 return JNI_EINVAL;
2518 }
2519 // -Xprof
2520 } else if (match_option(option, "-Xprof")) {
2521 char version[256];
2522 // Obsolete in JDK 10
2523 JDK_Version::jdk(10).to_string(version, sizeof(version));
2524 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2525 // -Xinternalversion
2526 } else if (match_option(option, "-Xinternalversion")) {
2527 jio_fprintf(defaultStream::output_stream(), "%s\n",
2528 VM_Version::internal_vm_info_string());
2529 vm_exit(0);
2530 #ifndef PRODUCT
2531 // -Xprintflags
2532 } else if (match_option(option, "-Xprintflags")) {
2533 JVMFlag::printFlags(tty, false);
2534 vm_exit(0);
2535 #endif
2536 // -D
2537 } else if (match_option(option, "-D", &tail)) {
2538 const char* value;
2539 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2540 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2541 // abort if -Djava.endorsed.dirs is set
2542 jio_fprintf(defaultStream::output_stream(),
2543 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2544 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2545 return JNI_EINVAL;
2546 }
2547 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2548 *value != '\0' && strcmp(value, "\"\"") != 0) {
2549 // abort if -Djava.ext.dirs is set
2550 jio_fprintf(defaultStream::output_stream(),
2551 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2552 return JNI_EINVAL;
2553 }
2554 // Check for module related properties. They must be set using the modules
2555 // options. For example: use "--add-modules=java.sql", not
2556 // "-Djdk.module.addmods=java.sql"
2557 if (is_internal_module_property(option->optionString + 2)) {
2558 needs_module_property_warning = true;
2559 continue;
2560 }
2561 if (!add_property(tail)) {
2562 return JNI_ENOMEM;
2563 }
2564 // Out of the box management support
2565 if (match_option(option, "-Dcom.sun.management", &tail)) {
2566 #if INCLUDE_MANAGEMENT
2567 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2568 return JNI_EINVAL;
2569 }
2570 // management agent in module jdk.management.agent
2571 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2572 return JNI_ENOMEM;
2573 }
2574 #else
2575 jio_fprintf(defaultStream::output_stream(),
2576 "-Dcom.sun.management is not supported in this VM.\n");
2577 return JNI_ERR;
2578 #endif
2579 }
2580 // -Xint
2581 } else if (match_option(option, "-Xint")) {
2582 set_mode_flags(_int);
2583 mode_flag_cmd_line = true;
2584 // -Xmixed
2585 } else if (match_option(option, "-Xmixed")) {
2586 set_mode_flags(_mixed);
2587 mode_flag_cmd_line = true;
2588 // -Xcomp
2589 } else if (match_option(option, "-Xcomp")) {
2590 // for testing the compiler; turn off all flags that inhibit compilation
2591 set_mode_flags(_comp);
2592 mode_flag_cmd_line = true;
2593 // -Xshare:dump
2594 } else if (match_option(option, "-Xshare:dump")) {
2595 CDSConfig::enable_dumping_static_archive();
2596 // -Xshare:on
2597 } else if (match_option(option, "-Xshare:on")) {
2598 UseSharedSpaces = true;
2599 RequireSharedSpaces = true;
2600 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2601 } else if (match_option(option, "-Xshare:auto")) {
2602 UseSharedSpaces = true;
2603 RequireSharedSpaces = false;
2604 xshare_auto_cmd_line = true;
2605 // -Xshare:off
2606 } else if (match_option(option, "-Xshare:off")) {
2607 UseSharedSpaces = false;
2608 RequireSharedSpaces = false;
2609 // -Xverify
2610 } else if (match_option(option, "-Xverify", &tail)) {
2611 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2612 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2616 return JNI_EINVAL;
2617 }
2618 } else if (strcmp(tail, ":remote") == 0) {
2619 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2620 return JNI_EINVAL;
2621 }
2622 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2623 return JNI_EINVAL;
2624 }
2625 } else if (strcmp(tail, ":none") == 0) {
2626 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2627 return JNI_EINVAL;
2628 }
2629 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2630 return JNI_EINVAL;
2631 }
2632 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2633 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2634 return JNI_EINVAL;
2635 }
2636 // -Xdebug
2637 } else if (match_option(option, "-Xdebug")) {
2638 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2639 } else if (match_option(option, "-Xloggc:", &tail)) {
2640 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2641 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2642 _legacyGCLogging.lastFlag = 2;
2643 _legacyGCLogging.file = os::strdup_check_oom(tail);
2644 } else if (match_option(option, "-Xlog", &tail)) {
2645 bool ret = false;
2646 if (strcmp(tail, ":help") == 0) {
2647 fileStream stream(defaultStream::output_stream());
2648 LogConfiguration::print_command_line_help(&stream);
2649 vm_exit(0);
2650 } else if (strcmp(tail, ":disable") == 0) {
2651 LogConfiguration::disable_logging();
2652 ret = true;
2653 } else if (strcmp(tail, ":async") == 0) {
2654 LogConfiguration::set_async_mode(true);
2655 ret = true;
2656 } else if (*tail == '\0') {
2657 ret = LogConfiguration::parse_command_line_arguments();
2658 assert(ret, "-Xlog without arguments should never fail to parse");
2659 } else if (*tail == ':') {
2660 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2661 }
2662 if (ret == false) {
2663 jio_fprintf(defaultStream::error_stream(),
2664 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2665 tail);
2666 return JNI_EINVAL;
2667 }
2668 // JNI hooks
2669 } else if (match_option(option, "-Xcheck", &tail)) {
2670 if (!strcmp(tail, ":jni")) {
2671 #if !INCLUDE_JNI_CHECK
2672 warning("JNI CHECKING is not supported in this VM");
2673 #else
2674 CheckJNICalls = true;
2675 #endif // INCLUDE_JNI_CHECK
2676 } else if (is_bad_option(option, args->ignoreUnrecognized,
2677 "check")) {
2678 return JNI_EINVAL;
2679 }
2680 } else if (match_option(option, "vfprintf")) {
2681 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2682 } else if (match_option(option, "exit")) {
2683 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2684 } else if (match_option(option, "abort")) {
2685 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2686 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2687 // and the last option wins.
2688 } else if (match_option(option, "-XX:+NeverTenure")) {
2689 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2699 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2700 return JNI_EINVAL;
2701 }
2702 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2703 return JNI_EINVAL;
2704 }
2705 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2709 uint max_tenuring_thresh = 0;
2710 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2711 jio_fprintf(defaultStream::error_stream(),
2712 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2713 return JNI_EINVAL;
2714 }
2715
2716 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719
2720 if (MaxTenuringThreshold == 0) {
2721 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 } else {
2728 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 }
2735 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2736 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2743 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2750 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2751 return JNI_EINVAL;
2752 }
2753 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2757 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 } else if (match_option(option, "--finalization=", &tail)) {
2764 if (strcmp(tail, "enabled") == 0) {
2765 InstanceKlass::set_finalization_enabled(true);
2766 } else if (strcmp(tail, "disabled") == 0) {
2767 InstanceKlass::set_finalization_enabled(false);
2768 } else {
2769 jio_fprintf(defaultStream::error_stream(),
2770 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2771 tail);
2772 return JNI_EINVAL;
2773 }
2774 #if !defined(DTRACE_ENABLED)
2775 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "DTraceMethodProbes flag is not applicable for this configuration\n");
2778 return JNI_EINVAL;
2779 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2780 jio_fprintf(defaultStream::error_stream(),
2781 "DTraceAllocProbes flag is not applicable for this configuration\n");
2782 return JNI_EINVAL;
2783 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2786 return JNI_EINVAL;
2787 #endif // !defined(DTRACE_ENABLED)
2788 #ifdef ASSERT
2789 } else if (match_option(option, "-XX:+FullGCALot")) {
2790 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 // disable scavenge before parallel mark-compact
2794 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2795 return JNI_EINVAL;
2796 }
2797 #endif
2798 #if !INCLUDE_MANAGEMENT
2799 } else if (match_option(option, "-XX:+ManagementServer")) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "ManagementServer is not supported in this VM.\n");
2802 return JNI_ERR;
2803 #endif // INCLUDE_MANAGEMENT
2804 #if INCLUDE_JVMCI
2805 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2806 if (EnableJVMCIProduct) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2809 return JNI_EINVAL;
2810 }
2811 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2812 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2813 if (use_graal_jit) {
2814 const char* jvmci_compiler = get_property("jvmci.Compiler");
2815 if (jvmci_compiler != nullptr) {
2816 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2819 return JNI_ERR;
2820 }
2821 } else if (!add_property("jvmci.Compiler=graal")) {
2822 return JNI_ENOMEM;
2823 }
2824 }
2825
2826 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2827 if (EnableJVMCIProduct) {
2828 continue;
2829 }
2830 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2831 // Allow this flag if it has been unlocked.
2832 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2833 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Unable to enable JVMCI in product mode\n");
2836 return JNI_ERR;
2837 }
2838 }
2839 // The flag was locked so process normally to report that error
2840 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2841 return JNI_EINVAL;
2842 }
2843 #endif // INCLUDE_JVMCI
2844 #if INCLUDE_JFR
2845 } else if (match_jfr_option(&option)) {
2846 return JNI_EINVAL;
2847 #endif
2848 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2849 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2850 // already been handled
2851 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2852 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2853 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2854 return JNI_EINVAL;
2855 }
2856 }
2857 // Unknown option
2858 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2859 return JNI_ERR;
2860 }
2861 }
2862
2863 // PrintSharedArchiveAndExit will turn on
2864 // -Xshare:on
2865 // -Xlog:class+path=info
2866 if (PrintSharedArchiveAndExit) {
2867 UseSharedSpaces = true;
2868 RequireSharedSpaces = true;
2869 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2870 }
2871
2872 fix_appclasspath();
2873
2874 return JNI_OK;
2875 }
2876
2877 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2878 if (!allow_cds) {
2879 CDSConfig::set_module_patching_disables_cds();
2880 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2881 CDSConfig::set_java_base_module_patching_disables_cds();
2882 }
2883 }
2884
2885 // Create GrowableArray lazily, only if --patch-module has been specified
2886 if (_patch_mod_prefix == nullptr) {
2887 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2888 }
2889
2890 // Scan patches for matching module
2891 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2892 return (strcmp(module_name, patch->module_name()) == 0);
2893 });
2894 if (i == -1) {
2895 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2896 } else {
2897 if (allow_append) {
2898 // append path to existing module entry
2899 _patch_mod_prefix->at(i)->append_path(path);
2900 } else {
2901 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2902 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2903 } else {
2904 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2905 }
2906 }
2907 }
2908 }
2909
2910 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2911 //
2912 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2913 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2914 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2915 // path is treated as the current directory.
2916 //
2917 // This causes problems with CDS, which requires that all directories specified in the classpath
2918 // must be empty. In most cases, applications do NOT want to load classes from the current
2919 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2920 // scripts compatible with CDS.
2921 void Arguments::fix_appclasspath() {
2922 if (IgnoreEmptyClassPaths) {
2923 const char separator = *os::path_separator();
2924 const char* src = _java_class_path->value();
2925
2926 // skip over all the leading empty paths
2927 while (*src == separator) {
2928 src ++;
2929 }
2930
2931 char* copy = os::strdup_check_oom(src, mtArguments);
2932
2933 // trim all trailing empty paths
2934 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2935 *tail = '\0';
2936 }
2937
2938 char from[3] = {separator, separator, '\0'};
2939 char to [2] = {separator, '\0'};
2940 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2941 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2942 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2943 }
2944
2945 _java_class_path->set_writeable_value(copy);
2946 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2947 }
2948 }
2949
2950 jint Arguments::finalize_vm_init_args() {
2951 // check if the default lib/endorsed directory exists; if so, error
2952 char path[JVM_MAXPATHLEN];
2953 const char* fileSep = os::file_separator();
2954 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2955
2956 DIR* dir = os::opendir(path);
2957 if (dir != nullptr) {
2958 jio_fprintf(defaultStream::output_stream(),
2959 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2960 "in modular form will be supported via the concept of upgradeable modules.\n");
2961 os::closedir(dir);
2962 return JNI_ERR;
2963 }
2964
2965 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2966 dir = os::opendir(path);
2967 if (dir != nullptr) {
2968 jio_fprintf(defaultStream::output_stream(),
2969 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2970 "Use -classpath instead.\n.");
2971 os::closedir(dir);
2972 return JNI_ERR;
2973 }
2974
2975 // This must be done after all arguments have been processed
2976 // and the container support has been initialized since AggressiveHeap
2977 // relies on the amount of total memory available.
2978 if (AggressiveHeap) {
2979 jint result = set_aggressive_heap_flags();
2980 if (result != JNI_OK) {
2981 return result;
2982 }
2983 }
2984
2985 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2986 // but like -Xint, leave compilation thresholds unaffected.
2987 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2988 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2989 set_mode_flags(_int);
2990 }
2991
2992 #ifdef ZERO
2993 // Zero always runs in interpreted mode
2994 set_mode_flags(_int);
2995 #endif
2996
2997 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2998 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2999 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3000 }
3001
3002 #if !COMPILER2_OR_JVMCI
3003 // Don't degrade server performance for footprint
3004 if (FLAG_IS_DEFAULT(UseLargePages) &&
3005 MaxHeapSize < LargePageHeapSizeThreshold) {
3006 // No need for large granularity pages w/small heaps.
3007 // Note that large pages are enabled/disabled for both the
3008 // Java heap and the code cache.
3009 FLAG_SET_DEFAULT(UseLargePages, false);
3010 }
3011
3012 UNSUPPORTED_OPTION(ProfileInterpreter);
3013 #endif
3014
3015 // Parse the CompilationMode flag
3016 if (!CompilationModeFlag::initialize()) {
3017 return JNI_ERR;
3018 }
3019
3020 if (!check_vm_args_consistency()) {
3021 return JNI_ERR;
3022 }
3023
3024 // finalize --module-patch and related --enable-preview
3025 if (finalize_patch_module() != JNI_OK) {
3026 return JNI_ERR;
3027 }
3028
3029 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
3030 return JNI_ERR;
3031 }
3032
3033 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3034 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3035 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3036
3037 return JNI_OK;
3038 }
3039
3040 // Helper class for controlling the lifetime of JavaVMInitArgs
3041 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3042 // deleted on the destruction of the ScopedVMInitArgs object.
3043 class ScopedVMInitArgs : public StackObj {
3044 private:
3045 JavaVMInitArgs _args;
3046 char* _container_name;
3047 bool _is_set;
3048 char* _vm_options_file_arg;
3049
3050 public:
3051 ScopedVMInitArgs(const char *container_name) {
3052 _args.version = JNI_VERSION_1_2;
3053 _args.nOptions = 0;
3054 _args.options = nullptr;
3055 _args.ignoreUnrecognized = false;
3056 _container_name = (char *)container_name;
3057 _is_set = false;
3058 _vm_options_file_arg = nullptr;
3059 }
3060
3061 // Populates the JavaVMInitArgs object represented by this
3062 // ScopedVMInitArgs object with the arguments in options. The
3063 // allocated memory is deleted by the destructor. If this method
3064 // returns anything other than JNI_OK, then this object is in a
3065 // partially constructed state, and should be abandoned.
3066 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3067 _is_set = true;
3068 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3069 JavaVMOption, options->length(), mtArguments);
3070 if (options_arr == nullptr) {
3071 return JNI_ENOMEM;
3072 }
3073 _args.options = options_arr;
3074
3075 for (int i = 0; i < options->length(); i++) {
3076 options_arr[i] = options->at(i);
3077 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3078 if (options_arr[i].optionString == nullptr) {
3079 // Rely on the destructor to do cleanup.
3080 _args.nOptions = i;
3081 return JNI_ENOMEM;
3082 }
3083 }
3084
3085 _args.nOptions = options->length();
3086 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3087 return JNI_OK;
3088 }
3089
3090 JavaVMInitArgs* get() { return &_args; }
3091 char* container_name() { return _container_name; }
3092 bool is_set() { return _is_set; }
3093 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3094 char* vm_options_file_arg() { return _vm_options_file_arg; }
3095
3096 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3097 if (_vm_options_file_arg != nullptr) {
3098 os::free(_vm_options_file_arg);
3099 }
3100 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3101 }
3102
3103 ~ScopedVMInitArgs() {
3104 if (_vm_options_file_arg != nullptr) {
3105 os::free(_vm_options_file_arg);
3106 }
3107 if (_args.options == nullptr) return;
3108 for (int i = 0; i < _args.nOptions; i++) {
3109 os::free(_args.options[i].optionString);
3110 }
3111 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3112 }
3113
3114 // Insert options into this option list, to replace option at
3115 // vm_options_file_pos (-XX:VMOptionsFile)
3116 jint insert(const JavaVMInitArgs* args,
3117 const JavaVMInitArgs* args_to_insert,
3118 const int vm_options_file_pos) {
3119 assert(_args.options == nullptr, "shouldn't be set yet");
3120 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3121 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3122
3123 int length = args->nOptions + args_to_insert->nOptions - 1;
3124 // Construct new option array
3125 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3126 for (int i = 0; i < args->nOptions; i++) {
3127 if (i == vm_options_file_pos) {
3128 // insert the new options starting at the same place as the
3129 // -XX:VMOptionsFile option
3130 for (int j = 0; j < args_to_insert->nOptions; j++) {
3131 options.push(args_to_insert->options[j]);
3132 }
3133 } else {
3134 options.push(args->options[i]);
3135 }
3136 }
3137 // make into options array
3138 return set_args(&options);
3139 }
3140 };
3141
3142 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3143 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3144 }
3145
3146 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3147 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3148 }
3149
3150 jint Arguments::parse_options_environment_variable(const char* name,
3151 ScopedVMInitArgs* vm_args) {
3152 char *buffer = ::getenv(name);
3153
3154 // Don't check this environment variable if user has special privileges
3155 // (e.g. unix su command).
3156 if (buffer == nullptr || os::have_special_privileges()) {
3157 return JNI_OK;
3158 }
3159
3160 if ((buffer = os::strdup(buffer)) == nullptr) {
3161 return JNI_ENOMEM;
3162 }
3163
3164 jio_fprintf(defaultStream::error_stream(),
3165 "Picked up %s: %s\n", name, buffer);
3166
3167 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3168
3169 os::free(buffer);
3170 return retcode;
3171 }
3172
3173 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3174 // read file into buffer
3175 int fd = ::open(file_name, O_RDONLY);
3176 if (fd < 0) {
3177 jio_fprintf(defaultStream::error_stream(),
3178 "Could not open options file '%s'\n",
3179 file_name);
3180 return JNI_ERR;
3181 }
3182
3183 struct stat stbuf;
3184 int retcode = os::stat(file_name, &stbuf);
3185 if (retcode != 0) {
3186 jio_fprintf(defaultStream::error_stream(),
3187 "Could not stat options file '%s'\n",
3188 file_name);
3189 ::close(fd);
3190 return JNI_ERR;
3191 }
3192
3193 if (stbuf.st_size == 0) {
3194 // tell caller there is no option data and that is ok
3195 ::close(fd);
3196 return JNI_OK;
3197 }
3198
3199 // '+ 1' for null termination even with max bytes
3200 size_t bytes_alloc = stbuf.st_size + 1;
3201
3202 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3203 if (nullptr == buf) {
3204 jio_fprintf(defaultStream::error_stream(),
3205 "Could not allocate read buffer for options file parse\n");
3206 ::close(fd);
3207 return JNI_ENOMEM;
3208 }
3209
3210 memset(buf, 0, bytes_alloc);
3211
3212 // Fill buffer
3213 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3214 ::close(fd);
3215 if (bytes_read < 0) {
3216 FREE_C_HEAP_ARRAY(char, buf);
3217 jio_fprintf(defaultStream::error_stream(),
3218 "Could not read options file '%s'\n", file_name);
3219 return JNI_ERR;
3220 }
3221
3222 if (bytes_read == 0) {
3223 // tell caller there is no option data and that is ok
3224 FREE_C_HEAP_ARRAY(char, buf);
3225 return JNI_OK;
3226 }
3227
3228 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3229
3230 FREE_C_HEAP_ARRAY(char, buf);
3231 return retcode;
3232 }
3233
3234 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3235 // Construct option array
3236 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3237
3238 // some pointers to help with parsing
3239 char *buffer_end = buffer + buf_len;
3240 char *opt_hd = buffer;
3241 char *wrt = buffer;
3242 char *rd = buffer;
3243
3244 // parse all options
3245 while (rd < buffer_end) {
3246 // skip leading white space from the input string
3247 while (rd < buffer_end && isspace(*rd)) {
3248 rd++;
3249 }
3250
3251 if (rd >= buffer_end) {
3252 break;
3253 }
3254
3255 // Remember this is where we found the head of the token.
3256 opt_hd = wrt;
3257
3258 // Tokens are strings of non white space characters separated
3259 // by one or more white spaces.
3260 while (rd < buffer_end && !isspace(*rd)) {
3261 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3262 int quote = *rd; // matching quote to look for
3263 rd++; // don't copy open quote
3264 while (rd < buffer_end && *rd != quote) {
3265 // include everything (even spaces)
3266 // up until the close quote
3267 *wrt++ = *rd++; // copy to option string
3268 }
3269
3270 if (rd < buffer_end) {
3271 rd++; // don't copy close quote
3272 } else {
3273 // did not see closing quote
3274 jio_fprintf(defaultStream::error_stream(),
3275 "Unmatched quote in %s\n", name);
3276 return JNI_ERR;
3277 }
3278 } else {
3279 *wrt++ = *rd++; // copy to option string
3280 }
3281 }
3282
3283 // steal a white space character and set it to null
3284 *wrt++ = '\0';
3285 // We now have a complete token
3286
3287 JavaVMOption option;
3288 option.optionString = opt_hd;
3289 option.extraInfo = nullptr;
3290
3291 options.append(option); // Fill in option
3292
3293 rd++; // Advance to next character
3294 }
3295
3296 // Fill out JavaVMInitArgs structure.
3297 return vm_args->set_args(&options);
3298 }
3299
3300 #ifndef PRODUCT
3301 // Determine whether LogVMOutput should be implicitly turned on.
3302 static bool use_vm_log() {
3303 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3304 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3305 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3306 PrintAssembly || TraceDeoptimization ||
3307 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3308 return true;
3309 }
3310
3311 #ifdef COMPILER1
3312 if (PrintC1Statistics) {
3313 return true;
3314 }
3315 #endif // COMPILER1
3316
3317 #ifdef COMPILER2
3318 if (PrintOptoAssembly || PrintOptoStatistics) {
3319 return true;
3320 }
3321 #endif // COMPILER2
3322
3323 return false;
3324 }
3325
3326 #endif // PRODUCT
3327
3328 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3329 for (int index = 0; index < args->nOptions; index++) {
3330 const JavaVMOption* option = args->options + index;
3331 const char* tail;
3332 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3333 return true;
3334 }
3335 }
3336 return false;
3337 }
3338
3339 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3340 const char* vm_options_file,
3341 const int vm_options_file_pos,
3342 ScopedVMInitArgs* vm_options_file_args,
3343 ScopedVMInitArgs* args_out) {
3344 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3345 if (code != JNI_OK) {
3346 return code;
3347 }
3348
3349 if (vm_options_file_args->get()->nOptions < 1) {
3350 return JNI_OK;
3351 }
3352
3353 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3354 jio_fprintf(defaultStream::error_stream(),
3355 "A VM options file may not refer to a VM options file. "
3356 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3357 "options file '%s' in options container '%s' is an error.\n",
3358 vm_options_file_args->vm_options_file_arg(),
3359 vm_options_file_args->container_name());
3360 return JNI_EINVAL;
3361 }
3362
3363 return args_out->insert(args, vm_options_file_args->get(),
3364 vm_options_file_pos);
3365 }
3366
3367 // Expand -XX:VMOptionsFile found in args_in as needed.
3368 // mod_args and args_out parameters may return values as needed.
3369 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3370 ScopedVMInitArgs* mod_args,
3371 JavaVMInitArgs** args_out) {
3372 jint code = match_special_option_and_act(args_in, mod_args);
3373 if (code != JNI_OK) {
3374 return code;
3375 }
3376
3377 if (mod_args->is_set()) {
3378 // args_in contains -XX:VMOptionsFile and mod_args contains the
3379 // original options from args_in along with the options expanded
3380 // from the VMOptionsFile. Return a short-hand to the caller.
3381 *args_out = mod_args->get();
3382 } else {
3383 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3384 }
3385 return JNI_OK;
3386 }
3387
3388 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3389 ScopedVMInitArgs* args_out) {
3390 // Remaining part of option string
3391 const char* tail;
3392 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3393
3394 for (int index = 0; index < args->nOptions; index++) {
3395 const JavaVMOption* option = args->options + index;
3396 if (match_option(option, "-XX:Flags=", &tail)) {
3397 Arguments::set_jvm_flags_file(tail);
3398 continue;
3399 }
3400 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3401 if (vm_options_file_args.found_vm_options_file_arg()) {
3402 jio_fprintf(defaultStream::error_stream(),
3403 "The option '%s' is already specified in the options "
3404 "container '%s' so the specification of '%s' in the "
3405 "same options container is an error.\n",
3406 vm_options_file_args.vm_options_file_arg(),
3407 vm_options_file_args.container_name(),
3408 option->optionString);
3409 return JNI_EINVAL;
3410 }
3411 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3412 // If there's a VMOptionsFile, parse that
3413 jint code = insert_vm_options_file(args, tail, index,
3414 &vm_options_file_args, args_out);
3415 if (code != JNI_OK) {
3416 return code;
3417 }
3418 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3419 if (args_out->is_set()) {
3420 // The VMOptions file inserted some options so switch 'args'
3421 // to the new set of options, and continue processing which
3422 // preserves "last option wins" semantics.
3423 args = args_out->get();
3424 // The first option from the VMOptionsFile replaces the
3425 // current option. So we back track to process the
3426 // replacement option.
3427 index--;
3428 }
3429 continue;
3430 }
3431 if (match_option(option, "-XX:+PrintVMOptions")) {
3432 PrintVMOptions = true;
3433 continue;
3434 }
3435 if (match_option(option, "-XX:-PrintVMOptions")) {
3436 PrintVMOptions = false;
3437 continue;
3438 }
3439 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3440 IgnoreUnrecognizedVMOptions = true;
3441 continue;
3442 }
3443 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3444 IgnoreUnrecognizedVMOptions = false;
3445 continue;
3446 }
3447 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3448 JVMFlag::printFlags(tty, false);
3449 vm_exit(0);
3450 }
3451
3452 #ifndef PRODUCT
3453 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3454 JVMFlag::printFlags(tty, true);
3455 vm_exit(0);
3456 }
3457 #endif
3458 }
3459 return JNI_OK;
3460 }
3461
3462 static void print_options(const JavaVMInitArgs *args) {
3463 const char* tail;
3464 for (int index = 0; index < args->nOptions; index++) {
3465 const JavaVMOption *option = args->options + index;
3466 if (match_option(option, "-XX:", &tail)) {
3467 logOption(tail);
3468 }
3469 }
3470 }
3471
3472 bool Arguments::handle_deprecated_print_gc_flags() {
3473 if (PrintGC) {
3474 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3475 }
3476 if (PrintGCDetails) {
3477 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3478 }
3479
3480 if (_legacyGCLogging.lastFlag == 2) {
3481 // -Xloggc was used to specify a filename
3482 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3483
3484 LogTarget(Error, logging) target;
3485 LogStream errstream(target);
3486 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3487 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3488 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3489 }
3490 return true;
3491 }
3492
3493 static void apply_debugger_ergo() {
3494 #ifndef PRODUCT
3495 // UseDebuggerErgo is notproduct
3496 if (ReplayCompiles) {
3497 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3498 }
3499 #endif
3500
3501 #ifndef PRODUCT
3502 if (UseDebuggerErgo) {
3503 // Turn on sub-flags
3504 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3505 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3506 }
3507 #endif
3508
3509 if (UseDebuggerErgo2) {
3510 // Debugging with limited number of CPUs
3511 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3512 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3513 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3514 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3515 }
3516 }
3517
3518 // Parse entry point called from JNI_CreateJavaVM
3519
3520 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3521 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3522 JVMFlag::check_all_flag_declarations();
3523
3524 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3525 const char* hotspotrc = ".hotspotrc";
3526 bool settings_file_specified = false;
3527 bool needs_hotspotrc_warning = false;
3528 ScopedVMInitArgs initial_vm_options_args("");
3529 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3530 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3531
3532 // Pointers to current working set of containers
3533 JavaVMInitArgs* cur_cmd_args;
3534 JavaVMInitArgs* cur_vm_options_args;
3535 JavaVMInitArgs* cur_java_options_args;
3536 JavaVMInitArgs* cur_java_tool_options_args;
3537
3538 // Containers for modified/expanded options
3539 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3540 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3541 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3542 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3543
3544
3545 jint code =
3546 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3547 if (code != JNI_OK) {
3548 return code;
3549 }
3550
3551 code = parse_java_options_environment_variable(&initial_java_options_args);
3552 if (code != JNI_OK) {
3553 return code;
3554 }
3555
3556 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3557 char *vmoptions = ClassLoader::lookup_vm_options();
3558 if (vmoptions != nullptr) {
3559 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3560 FREE_C_HEAP_ARRAY(char, vmoptions);
3561 if (code != JNI_OK) {
3562 return code;
3563 }
3564 }
3565
3566 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3567 &mod_java_tool_options_args,
3568 &cur_java_tool_options_args);
3569 if (code != JNI_OK) {
3570 return code;
3571 }
3572
3573 code = expand_vm_options_as_needed(initial_cmd_args,
3574 &mod_cmd_args,
3575 &cur_cmd_args);
3576 if (code != JNI_OK) {
3577 return code;
3578 }
3579
3580 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3581 &mod_java_options_args,
3582 &cur_java_options_args);
3583 if (code != JNI_OK) {
3584 return code;
3585 }
3586
3587 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3588 &mod_vm_options_args,
3589 &cur_vm_options_args);
3590 if (code != JNI_OK) {
3591 return code;
3592 }
3593
3594 const char* flags_file = Arguments::get_jvm_flags_file();
3595 settings_file_specified = (flags_file != nullptr);
3596
3597 if (IgnoreUnrecognizedVMOptions) {
3598 cur_cmd_args->ignoreUnrecognized = true;
3599 cur_java_tool_options_args->ignoreUnrecognized = true;
3600 cur_java_options_args->ignoreUnrecognized = true;
3601 }
3602
3603 // Parse specified settings file
3604 if (settings_file_specified) {
3605 if (!process_settings_file(flags_file, true,
3606 cur_cmd_args->ignoreUnrecognized)) {
3607 return JNI_EINVAL;
3608 }
3609 } else {
3610 #ifdef ASSERT
3611 // Parse default .hotspotrc settings file
3612 if (!process_settings_file(".hotspotrc", false,
3613 cur_cmd_args->ignoreUnrecognized)) {
3614 return JNI_EINVAL;
3615 }
3616 #else
3617 struct stat buf;
3618 if (os::stat(hotspotrc, &buf) == 0) {
3619 needs_hotspotrc_warning = true;
3620 }
3621 #endif
3622 }
3623
3624 if (PrintVMOptions) {
3625 print_options(cur_java_tool_options_args);
3626 print_options(cur_cmd_args);
3627 print_options(cur_java_options_args);
3628 }
3629
3630 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3631 jint result = parse_vm_init_args(cur_vm_options_args,
3632 cur_java_tool_options_args,
3633 cur_java_options_args,
3634 cur_cmd_args);
3635
3636 if (result != JNI_OK) {
3637 return result;
3638 }
3639
3640 // Delay warning until here so that we've had a chance to process
3641 // the -XX:-PrintWarnings flag
3642 if (needs_hotspotrc_warning) {
3643 warning("%s file is present but has been ignored. "
3644 "Run with -XX:Flags=%s to load the file.",
3645 hotspotrc, hotspotrc);
3646 }
3647
3648 if (needs_module_property_warning) {
3649 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3650 " names that are reserved for internal use.");
3651 }
3652
3653 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3654 UNSUPPORTED_OPTION(UseLargePages);
3655 #endif
3656
3657 #if defined(AIX)
3658 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3659 #endif
3660
3661 #ifndef PRODUCT
3662 if (TraceBytecodesAt != 0) {
3663 TraceBytecodes = true;
3664 }
3665 #endif // PRODUCT
3666
3667 if (ScavengeRootsInCode == 0) {
3668 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3669 warning("Forcing ScavengeRootsInCode non-zero");
3670 }
3671 ScavengeRootsInCode = 1;
3672 }
3673
3674 if (!handle_deprecated_print_gc_flags()) {
3675 return JNI_EINVAL;
3676 }
3677
3678 // Set object alignment values.
3679 set_object_alignment();
3680
3681 #if !INCLUDE_CDS
3682 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3683 jio_fprintf(defaultStream::error_stream(),
3684 "Shared spaces are not supported in this VM\n");
3685 return JNI_ERR;
3686 }
3687 if (DumpLoadedClassList != nullptr) {
3688 jio_fprintf(defaultStream::error_stream(),
3689 "DumpLoadedClassList is not supported in this VM\n");
3690 return JNI_ERR;
3691 }
3692 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3693 log_is_enabled(Info, cds)) {
3694 warning("Shared spaces are not supported in this VM");
3695 UseSharedSpaces = false;
3696 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3697 }
3698 no_shared_spaces("CDS Disabled");
3699 #endif // INCLUDE_CDS
3700
3701 // Verify NMT arguments
3702 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3703 if (lvl == NMT_unknown) {
3704 jio_fprintf(defaultStream::error_stream(),
3705 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3706 return JNI_ERR;
3707 }
3708 if (PrintNMTStatistics && lvl == NMT_off) {
3709 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3710 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3711 }
3712
3713 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3714 if (trace_dependencies && VerifyDependencies) {
3715 warning("dependency logging results may be inflated by VerifyDependencies");
3716 }
3717
3718 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3719 log_is_enabled(Info, class, load, cause);
3720 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3721 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3722 }
3723
3724 apply_debugger_ergo();
3725
3726 if (log_is_enabled(Info, arguments)) {
3727 LogStream st(Log(arguments)::info());
3728 Arguments::print_on(&st);
3729 }
3730
3731 return JNI_OK;
3732 }
3733
3734 jint Arguments::apply_ergo() {
3735 // Set flags based on ergonomics.
3736 jint result = set_ergonomics_flags();
3737 if (result != JNI_OK) return result;
3738
3739 // Set heap size based on available physical memory
3740 set_heap_size();
3741
3742 GCConfig::arguments()->initialize();
3743
3744 CDSConfig::initialize();
3745
3746 // Initialize Metaspace flags and alignments
3747 Metaspace::ergo_initialize();
3748
3749 if (!StringDedup::ergo_initialize()) {
3750 return JNI_EINVAL;
3751 }
3752
3753 // Set compiler flags after GC is selected and GC specific
3754 // flags (LoopStripMiningIter) are set.
3755 CompilerConfig::ergo_initialize();
3756
3757 // Set bytecode rewriting flags
3758 set_bytecode_flags();
3759
3760 // Set flags if aggressive optimization flags are enabled
3761 jint code = set_aggressive_opts_flags();
3762 if (code != JNI_OK) {
3763 return code;
3764 }
3765
3766 #ifdef ZERO
3767 // Clear flags not supported on zero.
3768 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3769 #endif // ZERO
3770
3771 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3772 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3773 DebugNonSafepoints = true;
3774 }
3775
3776 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3777 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3778 }
3779
3780 // Treat the odd case where local verification is enabled but remote
3781 // verification is not as if both were enabled.
3782 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3783 log_info(verification)("Turning on remote verification because local verification is on");
3784 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3785 }
3786 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3787 // Disable calling convention optimizations if inline types are not supported.
3788 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3789 // the CDS archive, as the values must match between dumptime and runtime.
3790 InlineTypePassFieldsAsArgs = false;
3791 InlineTypeReturnedAsFields = false;
3792 }
3793
3794 #ifndef PRODUCT
3795 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3796 if (use_vm_log()) {
3797 LogVMOutput = true;
3798 }
3799 }
3800 #endif // PRODUCT
3801
3802 if (PrintCommandLineFlags) {
3803 JVMFlag::printSetFlags(tty);
3804 }
3805
3806 #if COMPILER2_OR_JVMCI
3807 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3808 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3809 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3810 }
3811 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3812
3813 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3814 if (!EnableVectorReboxing) {
3815 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3816 } else {
3817 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3818 }
3819 }
3820 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3821
3822 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3823 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3824 }
3825 FLAG_SET_DEFAULT(UseVectorStubs, false);
3826 }
3827 #endif // COMPILER2_OR_JVMCI
3828
3829 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3830 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3831 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3832 }
3833 }
3834 return JNI_OK;
3835 }
3836
3837 jint Arguments::adjust_after_os() {
3838 if (UseNUMA) {
3839 if (UseParallelGC) {
3840 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3841 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3842 }
3843 }
3844 }
3845 return JNI_OK;
3846 }
3847
3848 int Arguments::PropertyList_count(SystemProperty* pl) {
3849 int count = 0;
3850 while(pl != nullptr) {
3851 count++;
3852 pl = pl->next();
3853 }
3854 return count;
3855 }
3856
3857 // Return the number of readable properties.
3858 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3859 int count = 0;
3860 while(pl != nullptr) {
3861 if (pl->readable()) {
3862 count++;
3863 }
3864 pl = pl->next();
3865 }
3866 return count;
3867 }
3868
3869 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3870 assert(key != nullptr, "just checking");
3871 SystemProperty* prop;
3872 for (prop = pl; prop != nullptr; prop = prop->next()) {
3873 if (strcmp(key, prop->key()) == 0) return prop->value();
3874 }
3875 return nullptr;
3876 }
3877
3878 // Return the value of the requested property provided that it is a readable property.
3879 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3880 assert(key != nullptr, "just checking");
3881 SystemProperty* prop;
3882 // Return the property value if the keys match and the property is not internal or
3883 // it's the special internal property "jdk.boot.class.path.append".
3884 for (prop = pl; prop != nullptr; prop = prop->next()) {
3885 if (strcmp(key, prop->key()) == 0) {
3886 if (!prop->internal()) {
3887 return prop->value();
3888 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3889 return prop->value();
3890 } else {
3891 // Property is internal and not jdk.boot.class.path.append so return null.
3892 return nullptr;
3893 }
3894 }
3895 }
3896 return nullptr;
3897 }
3898
3899 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3900 SystemProperty* p = *plist;
3901 if (p == nullptr) {
3902 *plist = new_p;
3903 } else {
3904 while (p->next() != nullptr) {
3905 p = p->next();
3906 }
3907 p->set_next(new_p);
3908 }
3909 }
3910
3911 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3912 bool writeable, bool internal) {
3913 if (plist == nullptr)
3914 return;
3915
3916 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3917 PropertyList_add(plist, new_p);
3918 }
3919
3920 void Arguments::PropertyList_add(SystemProperty *element) {
3921 PropertyList_add(&_system_properties, element);
3922 }
3923
3924 // This add maintains unique property key in the list.
3925 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3926 PropertyAppendable append, PropertyWriteable writeable,
3927 PropertyInternal internal) {
3928 if (plist == nullptr)
3929 return;
3930
3931 // If property key exists and is writeable, then update with new value.
3932 // Trying to update a non-writeable property is silently ignored.
3933 SystemProperty* prop;
3934 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3935 if (strcmp(k, prop->key()) == 0) {
3936 if (append == AppendProperty) {
3937 prop->append_writeable_value(v);
3938 } else {
3939 prop->set_writeable_value(v);
3940 }
3941 return;
3942 }
3943 }
3944
3945 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3946 }
3947
3948 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3949 // Returns true if all of the source pointed by src has been copied over to
3950 // the destination buffer pointed by buf. Otherwise, returns false.
3951 // Notes:
3952 // 1. If the length (buflen) of the destination buffer excluding the
3953 // null terminator character is not long enough for holding the expanded
3954 // pid characters, it also returns false instead of returning the partially
3955 // expanded one.
3956 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3957 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3958 char* buf, size_t buflen) {
3959 const char* p = src;
3960 char* b = buf;
3961 const char* src_end = &src[srclen];
3962 char* buf_end = &buf[buflen - 1];
3963
3964 while (p < src_end && b < buf_end) {
3965 if (*p == '%') {
3966 switch (*(++p)) {
3967 case '%': // "%%" ==> "%"
3968 *b++ = *p++;
3969 break;
3970 case 'p': { // "%p" ==> current process id
3971 // buf_end points to the character before the last character so
3972 // that we could write '\0' to the end of the buffer.
3973 size_t buf_sz = buf_end - b + 1;
3974 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3975
3976 // if jio_snprintf fails or the buffer is not long enough to hold
3977 // the expanded pid, returns false.
3978 if (ret < 0 || ret >= (int)buf_sz) {
3979 return false;
3980 } else {
3981 b += ret;
3982 assert(*b == '\0', "fail in copy_expand_pid");
3983 if (p == src_end && b == buf_end + 1) {
3984 // reach the end of the buffer.
3985 return true;
3986 }
3987 }
3988 p++;
3989 break;
3990 }
3991 default :
3992 *b++ = '%';
3993 }
3994 } else {
3995 *b++ = *p++;
3996 }
3997 }
3998 *b = '\0';
3999 return (p == src_end); // return false if not all of the source was copied
4000 }