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/genArguments.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78 #include <string.h>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 unsigned int Arguments::_addmods_count = 0;
90 char* Arguments::_java_command = nullptr;
91 SystemProperty* Arguments::_system_properties = nullptr;
92 size_t Arguments::_conservative_max_heap_alignment = 0;
93 Arguments::Mode Arguments::_mode = _mixed;
94 const char* Arguments::_java_vendor_url_bug = nullptr;
95 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
96 bool Arguments::_sun_java_launcher_is_altjvm = false;
97
98 // These parameters are reset in method parse_vm_init_args()
99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
101 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
102 bool Arguments::_ClipInlining = ClipInlining;
103 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
104
105 bool Arguments::_enable_preview = false;
106
107 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
108
109 // These are not set by the JDK's built-in launchers, but they can be set by
110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
111 // JavaVMOption in jni.h.
112 abort_hook_t Arguments::_abort_hook = nullptr;
113 exit_hook_t Arguments::_exit_hook = nullptr;
114 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
115
116
117 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
118 SystemProperty *Arguments::_java_library_path = nullptr;
119 SystemProperty *Arguments::_java_home = nullptr;
120 SystemProperty *Arguments::_java_class_path = nullptr;
121 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
122 SystemProperty *Arguments::_vm_info = nullptr;
123
124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
125 PathString *Arguments::_boot_class_path = nullptr;
126 bool Arguments::_has_jimage = false;
127
128 char* Arguments::_ext_dirs = nullptr;
129
130 // True if -Xshare:auto option was specified.
131 static bool xshare_auto_cmd_line = false;
132
133 // True if -Xint/-Xmixed/-Xcomp were specified
134 static bool mode_flag_cmd_line = false;
135
136 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
137 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
138 if (new_value == nullptr) {
139 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
140 return false;
141 }
142 if (_value != nullptr) {
143 FreeHeap(_value);
144 }
145 _value = new_value;
146 strcpy(_value, value);
147 return true;
148 }
149
150 void PathString::append_value(const char *value) {
151 char *sp;
152 size_t len = 0;
153 if (value != nullptr) {
154 len = strlen(value);
155 if (_value != nullptr) {
156 len += strlen(_value);
157 }
158 sp = AllocateHeap(len+2, mtArguments);
159 assert(sp != nullptr, "Unable to allocate space for new append path value");
160 if (sp != nullptr) {
161 if (_value != nullptr) {
162 strcpy(sp, _value);
163 strcat(sp, os::path_separator());
164 strcat(sp, value);
165 FreeHeap(_value);
166 } else {
167 strcpy(sp, value);
168 }
169 _value = sp;
170 }
171 }
172 }
173
174 PathString::PathString(const char* value) {
175 if (value == nullptr) {
176 _value = nullptr;
177 } else {
178 _value = AllocateHeap(strlen(value)+1, mtArguments);
179 strcpy(_value, value);
180 }
181 }
182
183 PathString::~PathString() {
184 if (_value != nullptr) {
185 FreeHeap(_value);
186 _value = nullptr;
187 }
188 }
189
190 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
191 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
192 size_t len = strlen(module_name) + 1;
193 _module_name = AllocateHeap(len, mtInternal);
194 strncpy(_module_name, module_name, len); // copy the trailing null
195 _path = new PathString(path);
196 }
197
198 ModulePatchPath::~ModulePatchPath() {
199 if (_module_name != nullptr) {
200 FreeHeap(_module_name);
201 _module_name = nullptr;
202 }
203 if (_path != nullptr) {
204 delete _path;
205 _path = nullptr;
206 }
207 }
208
209 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
210 if (key == nullptr) {
211 _key = nullptr;
212 } else {
213 _key = AllocateHeap(strlen(key)+1, mtArguments);
214 strcpy(_key, key);
215 }
216 _next = nullptr;
217 _internal = internal;
218 _writeable = writeable;
219 }
220
221 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
222 // part of the option string.
223 static bool match_option(const JavaVMOption *option, const char* name,
224 const char** tail) {
225 size_t len = strlen(name);
226 if (strncmp(option->optionString, name, len) == 0) {
227 *tail = option->optionString + len;
228 return true;
229 } else {
230 return false;
231 }
232 }
233
234 // Check if 'option' matches 'name'. No "tail" is allowed.
235 static bool match_option(const JavaVMOption *option, const char* name) {
236 const char* tail = nullptr;
237 bool result = match_option(option, name, &tail);
238 if (tail != nullptr && *tail == '\0') {
239 return result;
240 } else {
241 return false;
242 }
243 }
244
245 // Return true if any of the strings in null-terminated array 'names' matches.
246 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
247 // the option must match exactly.
248 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
249 bool tail_allowed) {
250 for (/* empty */; *names != nullptr; ++names) {
251 if (match_option(option, *names, tail)) {
252 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
253 return true;
254 }
255 }
256 }
257 return false;
258 }
259
260 #if INCLUDE_JFR
261 static bool _has_jfr_option = false; // is using JFR
262
263 // return true on failure
264 static bool match_jfr_option(const JavaVMOption** option) {
265 assert((*option)->optionString != nullptr, "invariant");
266 char* tail = nullptr;
267 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
268 _has_jfr_option = true;
269 return Jfr::on_start_flight_recording_option(option, tail);
270 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_flight_recorder_option(option, tail);
273 }
274 return false;
275 }
276
277 bool Arguments::has_jfr_option() {
278 return _has_jfr_option;
279 }
280 #endif
281
282 static void logOption(const char* opt) {
283 if (PrintVMOptions) {
284 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
285 }
286 }
287
288 bool needs_module_property_warning = false;
289
290 #define MODULE_PROPERTY_PREFIX "jdk.module."
291 #define MODULE_PROPERTY_PREFIX_LEN 11
292 #define ADDEXPORTS "addexports"
293 #define ADDEXPORTS_LEN 10
294 #define ADDREADS "addreads"
295 #define ADDREADS_LEN 8
296 #define ADDOPENS "addopens"
297 #define ADDOPENS_LEN 8
298 #define PATCH "patch"
299 #define PATCH_LEN 5
300 #define ADDMODS "addmods"
301 #define ADDMODS_LEN 7
302 #define LIMITMODS "limitmods"
303 #define LIMITMODS_LEN 9
304 #define PATH "path"
305 #define PATH_LEN 4
306 #define UPGRADE_PATH "upgrade.path"
307 #define UPGRADE_PATH_LEN 12
308 #define ENABLE_NATIVE_ACCESS "enable.native.access"
309 #define ENABLE_NATIVE_ACCESS_LEN 20
310 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
311 #define ILLEGAL_NATIVE_ACCESS_LEN 21
312
313 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
314 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
315 return ((strncmp(option, property, len) == 0) &&
316 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
317 }
318
319 // Return true if property starts with "jdk.module." and its ensuing chars match
320 // any of the reserved module properties.
321 // property should be passed without the leading "-D".
322 bool Arguments::is_internal_module_property(const char* property) {
323 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
324 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
325 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
326 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
327 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
328 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
329 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
330 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
331 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
332 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
333 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
334 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
335 return true;
336 }
337 }
338 return false;
339 }
340
341 bool Arguments::is_add_modules_property(const char* key) {
342 return (strcmp(key, MODULE_PROPERTY_PREFIX ADDMODS) == 0);
343 }
344
345 // Return true if the key matches the --module-path property name ("jdk.module.path").
346 bool Arguments::is_module_path_property(const char* key) {
347 return (strcmp(key, MODULE_PROPERTY_PREFIX PATH) == 0);
348 }
349
350 // Process java launcher properties.
351 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
352 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
353 // Must do this before setting up other system properties,
354 // as some of them may depend on launcher type.
355 for (int index = 0; index < args->nOptions; index++) {
356 const JavaVMOption* option = args->options + index;
357 const char* tail;
358
359 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
360 process_java_launcher_argument(tail, option->extraInfo);
361 continue;
362 }
363 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
364 if (strcmp(tail, "true") == 0) {
365 _sun_java_launcher_is_altjvm = true;
366 }
367 continue;
368 }
369 }
370 }
371
372 // Initialize system properties key and value.
373 void Arguments::init_system_properties() {
374
375 // Set up _boot_class_path which is not a property but
376 // relies heavily on argument processing and the jdk.boot.class.path.append
377 // property. It is used to store the underlying boot class path.
378 _boot_class_path = new PathString(nullptr);
379
380 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
381 "Java Virtual Machine Specification", false));
382 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
383 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
384 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
385
386 // Initialize the vm.info now, but it will need updating after argument parsing.
387 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
388
389 // Following are JVMTI agent writable properties.
390 // Properties values are set to nullptr and they are
391 // os specific they are initialized in os::init_system_properties_values().
392 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
393 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
394 _java_home = new SystemProperty("java.home", nullptr, true);
395 _java_class_path = new SystemProperty("java.class.path", "", true);
396 // jdk.boot.class.path.append is a non-writeable, internal property.
397 // It can only be set by either:
398 // - -Xbootclasspath/a:
399 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
400 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
401
402 // Add to System Property list.
403 PropertyList_add(&_system_properties, _sun_boot_library_path);
404 PropertyList_add(&_system_properties, _java_library_path);
405 PropertyList_add(&_system_properties, _java_home);
406 PropertyList_add(&_system_properties, _java_class_path);
407 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
408 PropertyList_add(&_system_properties, _vm_info);
409
410 // Set OS specific system properties values
411 os::init_system_properties_values();
412 }
413
414 // Update/Initialize System properties after JDK version number is known
415 void Arguments::init_version_specific_system_properties() {
416 enum { bufsz = 16 };
417 char buffer[bufsz];
418 const char* spec_vendor = "Oracle Corporation";
419 uint32_t spec_version = JDK_Version::current().major_version();
420
421 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
422
423 PropertyList_add(&_system_properties,
424 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
425 PropertyList_add(&_system_properties,
426 new SystemProperty("java.vm.specification.version", buffer, false));
427 PropertyList_add(&_system_properties,
428 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
429 }
430
431 /*
432 * -XX argument processing:
433 *
434 * -XX arguments are defined in several places, such as:
435 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
436 * -XX arguments are parsed in parse_argument().
437 * -XX argument bounds checking is done in check_vm_args_consistency().
438 *
439 * Over time -XX arguments may change. There are mechanisms to handle common cases:
440 *
441 * ALIASED: An option that is simply another name for another option. This is often
442 * part of the process of deprecating a flag, but not all aliases need
443 * to be deprecated.
444 *
445 * Create an alias for an option by adding the old and new option names to the
446 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
447 *
448 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
449 * support may be removed in the future. Both regular and aliased options may be
450 * deprecated.
451 *
452 * Add a deprecation warning for an option (or alias) by adding an entry in the
453 * "special_jvm_flags" table and setting the "deprecated_in" field.
454 * Often an option "deprecated" in one major release will
455 * be made "obsolete" in the next. In this case the entry should also have its
456 * "obsolete_in" field set.
457 *
458 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
459 * on the command line. A warning is printed to let the user know that option might not
460 * be accepted in the future.
461 *
462 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
463 * table and setting the "obsolete_in" field.
464 *
465 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
466 * to the current JDK version. The system will flatly refuse to admit the existence of
467 * the flag. This allows a flag to die automatically over JDK releases.
468 *
469 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
470 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
471 * - Newly obsolete or expired deprecated options should have their global variable
472 * definitions removed (from globals.hpp, etc) and related implementations removed.
473 *
474 * Recommended approach for removing options:
475 *
476 * To remove options commonly used by customers (e.g. product -XX options), use
477 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
478 *
479 * To remove internal options (e.g. diagnostic, experimental, develop options), use
480 * a 2-step model adding major release numbers to the obsolete and expire columns.
481 *
482 * To change the name of an option, use the alias table as well as a 2-step
483 * model adding major release numbers to the deprecate and expire columns.
484 * Think twice about aliasing commonly used customer options.
485 *
486 * There are times when it is appropriate to leave a future release number as undefined.
487 *
488 * Tests: Aliases should be tested in VMAliasOptions.java.
489 * Deprecated options should be tested in VMDeprecatedOptions.java.
490 */
491
492 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
493 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
494 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
495 // the command-line as usual, but will issue a warning.
496 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
497 // the command-line, while issuing a warning and ignoring the flag value.
498 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
499 // existence of the flag.
500 //
501 // MANUAL CLEANUP ON JDK VERSION UPDATES:
502 // This table ensures that the handling of options will update automatically when the JDK
503 // version is incremented, but the source code needs to be cleanup up manually:
504 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
505 // variable should be removed, as well as users of the variable.
506 // - As "deprecated" options age into "obsolete" options, move the entry into the
507 // "Obsolete Flags" section of the table.
508 // - All expired options should be removed from the table.
509 static SpecialFlag const special_jvm_flags[] = {
510 // -------------- Deprecated Flags --------------
511 // --- Non-alias flags - sorted by obsolete_in then expired_in:
512 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
515 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
516 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
517 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
518 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
519 #ifdef LINUX
520 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
521 #endif
522 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
523 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
524 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
525
526 // -------------- Obsolete Flags - sorted by expired_in --------------
527
528 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
529 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
530 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
531 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
532 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
533 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
534 #if defined(X86)
535 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
536 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
537 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
538 #endif // X86
539
540
541 { "BaseFootPrintEstimate", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
542 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
543 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
544 #ifdef ASSERT
545 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
546 #endif
547
548 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
549 // These entries will generate build errors. Their purpose is to test the macros.
550 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
551 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
552 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
553 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
554 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
555 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
556 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
557 #endif
558
559 { nullptr, JDK_Version(0), JDK_Version(0) }
560 };
561
562 // Flags that are aliases for other flags.
563 typedef struct {
564 const char* alias_name;
565 const char* real_name;
566 } AliasedFlag;
567
568 static AliasedFlag const aliased_jvm_flags[] = {
569 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
570 { nullptr, nullptr}
571 };
572
573 // Return true if "v" is less than "other", where "other" may be "undefined".
574 static bool version_less_than(JDK_Version v, JDK_Version other) {
575 assert(!v.is_undefined(), "must be defined");
576 if (!other.is_undefined() && v.compare(other) >= 0) {
577 return false;
578 } else {
579 return true;
580 }
581 }
582
583 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
584 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
585 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
586 flag = special_jvm_flags[i];
587 return true;
588 }
589 }
590 return false;
591 }
592
593 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
594 assert(version != nullptr, "Must provide a version buffer");
595 SpecialFlag flag;
596 if (lookup_special_flag(flag_name, flag)) {
597 if (!flag.obsolete_in.is_undefined()) {
598 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
599 *version = flag.obsolete_in;
600 // This flag may have been marked for obsoletion in this version, but we may not
601 // have actually removed it yet. Rather than ignoring it as soon as we reach
602 // this version we allow some time for the removal to happen. So if the flag
603 // still actually exists we process it as normal, but issue an adjusted warning.
604 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
605 if (real_flag != nullptr) {
606 char version_str[256];
607 version->to_string(version_str, sizeof(version_str));
608 warning("Temporarily processing option %s; support is scheduled for removal in %s",
609 flag_name, version_str);
610 return false;
611 }
612 return true;
613 }
614 }
615 }
616 return false;
617 }
618
619 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
620 assert(version != nullptr, "Must provide a version buffer");
621 SpecialFlag flag;
622 if (lookup_special_flag(flag_name, flag)) {
623 if (!flag.deprecated_in.is_undefined()) {
624 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
625 version_less_than(JDK_Version::current(), flag.expired_in)) {
626 *version = flag.deprecated_in;
627 return 1;
628 } else {
629 return -1;
630 }
631 }
632 }
633 return 0;
634 }
635
636 const char* Arguments::real_flag_name(const char *flag_name) {
637 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
638 const AliasedFlag& flag_status = aliased_jvm_flags[i];
639 if (strcmp(flag_status.alias_name, flag_name) == 0) {
640 return flag_status.real_name;
641 }
642 }
643 return flag_name;
644 }
645
646 #ifdef ASSERT
647 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
648 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
649 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
650 return true;
651 }
652 }
653 return false;
654 }
655
656 // Verifies the correctness of the entries in the special_jvm_flags table.
657 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
658 // version being earlier than the deprecation version, then a warning is issued
659 // and verification fails - by returning false. If it is detected that the table
660 // is out of date, with respect to the current version, then ideally a warning is
661 // issued but verification does not fail. This allows the VM to operate when the
662 // version is first updated, without needing to update all the impacted flags at
663 // the same time. In practice we can't issue the warning immediately when the version
664 // is updated as it occurs for every test and some tests are not prepared to handle
665 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
666 // if the check_globals flag is true, and in addition allow a grace period and only
667 // check for stale flags when we hit build 25 (which is far enough into the 6 month
668 // release cycle that all flag updates should have been processed, whilst still
669 // leaving time to make the change before RDP2).
670 // We use a gtest to call this, passing true, so that we can detect stale flags before
671 // the end of the release cycle.
672
673 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
674
675 bool Arguments::verify_special_jvm_flags(bool check_globals) {
676 bool success = true;
677 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
678 const SpecialFlag& flag = special_jvm_flags[i];
679 if (lookup_special_flag(flag.name, i)) {
680 warning("Duplicate special flag declaration \"%s\"", flag.name);
681 success = false;
682 }
683 if (flag.deprecated_in.is_undefined() &&
684 flag.obsolete_in.is_undefined()) {
685 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
686 success = false;
687 }
688
689 if (!flag.deprecated_in.is_undefined()) {
690 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
691 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
692 success = false;
693 }
694
695 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
696 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
697 success = false;
698 }
699 }
700
701 if (!flag.obsolete_in.is_undefined()) {
702 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
703 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
704 success = false;
705 }
706
707 // if flag has become obsolete it should not have a "globals" flag defined anymore.
708 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
709 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
710 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
711 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
712 success = false;
713 }
714 }
715
716 } else if (!flag.expired_in.is_undefined()) {
717 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
718 success = false;
719 }
720
721 if (!flag.expired_in.is_undefined()) {
722 // if flag has become expired it should not have a "globals" flag defined anymore.
723 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
724 !version_less_than(JDK_Version::current(), flag.expired_in)) {
725 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
726 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
727 success = false;
728 }
729 }
730 }
731 }
732 return success;
733 }
734 #endif
735
736 bool Arguments::atojulong(const char *s, julong* result) {
737 return parse_integer(s, result);
738 }
739
740 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
741 if (size < min_size) return arg_too_small;
742 if (size > max_size) return arg_too_big;
743 return arg_in_range;
744 }
745
746 // Describe an argument out of range error
747 void Arguments::describe_range_error(ArgsRange errcode) {
748 switch(errcode) {
749 case arg_too_big:
750 jio_fprintf(defaultStream::error_stream(),
751 "The specified size exceeds the maximum "
752 "representable size.\n");
753 break;
754 case arg_too_small:
755 case arg_unreadable:
756 case arg_in_range:
757 // do nothing for now
758 break;
759 default:
760 ShouldNotReachHere();
761 }
762 }
763
764 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
765 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
766 return true;
767 } else {
768 return false;
769 }
770 }
771
772 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
773 // strtod allows leading whitespace, but our flag format does not.
774 if (*value == '\0' || isspace((unsigned char) *value)) {
775 return false;
776 }
777 char* end;
778 errno = 0;
779 double v = strtod(value, &end);
780 if ((errno != 0) || (*end != 0)) {
781 return false;
782 }
783 if (g_isnan(v) || !g_isfinite(v)) {
784 // Currently we cannot handle these special values.
785 return false;
786 }
787
788 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
789 return true;
790 }
791 return false;
792 }
793
794 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
795 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
796
797 if (flag->is_int()) {
798 int v;
799 if (parse_integer(value, &v)) {
800 result = JVMFlagAccess::set_int(flag, &v, origin);
801 }
802 } else if (flag->is_uint()) {
803 uint v;
804 if (parse_integer(value, &v)) {
805 result = JVMFlagAccess::set_uint(flag, &v, origin);
806 }
807 } else if (flag->is_intx()) {
808 intx v;
809 if (parse_integer(value, &v)) {
810 result = JVMFlagAccess::set_intx(flag, &v, origin);
811 }
812 } else if (flag->is_uintx()) {
813 uintx v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_uintx(flag, &v, origin);
816 }
817 } else if (flag->is_uint64_t()) {
818 uint64_t v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
821 }
822 } else if (flag->is_size_t()) {
823 size_t v;
824 if (parse_integer(value, &v)) {
825 result = JVMFlagAccess::set_size_t(flag, &v, origin);
826 }
827 }
828
829 return result == JVMFlag::SUCCESS;
830 }
831
832 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
833 if (value[0] == '\0') {
834 value = nullptr;
835 }
836 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
837 // Contract: JVMFlag always returns a pointer that needs freeing.
838 FREE_C_HEAP_ARRAY(char, value);
839 return true;
840 }
841
842 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
843 const char* old_value = "";
844 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
845 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
846 size_t new_len = strlen(new_value);
847 const char* value;
848 char* free_this_too = nullptr;
849 if (old_len == 0) {
850 value = new_value;
851 } else if (new_len == 0) {
852 value = old_value;
853 } else {
854 size_t length = old_len + 1 + new_len + 1;
855 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
856 // each new setting adds another LINE to the switch:
857 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
858 value = buf;
859 free_this_too = buf;
860 }
861 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
862 // JVMFlag always returns a pointer that needs freeing.
863 FREE_C_HEAP_ARRAY(char, value);
864 // JVMFlag made its own copy, so I must delete my own temp. buffer.
865 FREE_C_HEAP_ARRAY(char, free_this_too);
866 return true;
867 }
868
869 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
870 const char* real_name = real_flag_name(arg);
871 JDK_Version since = JDK_Version();
872 switch (is_deprecated_flag(arg, &since)) {
873 case -1: {
874 // Obsolete or expired, so don't process normally,
875 // but allow for an obsolete flag we're still
876 // temporarily allowing.
877 if (!is_obsolete_flag(arg, &since)) {
878 return real_name;
879 }
880 // Note if we're not considered obsolete then we can't be expired either
881 // as obsoletion must come first.
882 return nullptr;
883 }
884 case 0:
885 return real_name;
886 case 1: {
887 char version[256];
888 since.to_string(version, sizeof(version));
889 if (real_name != arg) {
890 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
891 arg, version, real_name);
892 } else {
893 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
894 arg, version);
895 }
896 return real_name;
897 }
898 }
899 ShouldNotReachHere();
900 return nullptr;
901 }
902
903 #define BUFLEN 255
904
905 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
906 char name_copied[BUFLEN+1];
907 if (name[name_length] != 0) {
908 if (name_length > BUFLEN) {
909 return nullptr;
910 } else {
911 strncpy(name_copied, name, name_length);
912 name_copied[name_length] = '\0';
913 name = name_copied;
914 }
915 }
916
917 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
918 if (real_name == nullptr) {
919 return nullptr;
920 }
921 JVMFlag* flag = JVMFlag::find_flag(real_name);
922 return flag;
923 }
924
925 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
926 bool is_bool = false;
927 bool bool_val = false;
928 char c = *arg;
929 if (c == '+' || c == '-') {
930 is_bool = true;
931 bool_val = (c == '+');
932 arg++;
933 }
934
935 const char* name = arg;
936 while (true) {
937 c = *arg;
938 if (isalnum(c) || (c == '_')) {
939 ++arg;
940 } else {
941 break;
942 }
943 }
944
945 size_t name_len = size_t(arg - name);
946 if (name_len == 0) {
947 return false;
948 }
949
950 JVMFlag* flag = find_jvm_flag(name, name_len);
951 if (flag == nullptr) {
952 return false;
953 }
954
955 if (is_bool) {
956 if (*arg != 0) {
957 // Error -- extra characters such as -XX:+BoolFlag=123
958 return false;
959 }
960 return set_bool_flag(flag, bool_val, origin);
961 }
962
963 if (arg[0] == '=') {
964 const char* value = arg + 1;
965 if (flag->is_ccstr()) {
966 if (flag->ccstr_accumulates()) {
967 return append_to_string_flag(flag, value, origin);
968 } else {
969 return set_string_flag(flag, value, origin);
970 }
971 } else if (flag->is_double()) {
972 return set_fp_numeric_flag(flag, value, origin);
973 } else {
974 return set_numeric_flag(flag, value, origin);
975 }
976 }
977
978 if (arg[0] == ':' && arg[1] == '=') {
979 // -XX:Foo:=xxx will reset the string flag to the given value.
980 const char* value = arg + 2;
981 return set_string_flag(flag, value, origin);
982 }
983
984 return false;
985 }
986
987 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
988 assert(bldarray != nullptr, "illegal argument");
989
990 if (arg == nullptr) {
991 return;
992 }
993
994 int new_count = *count + 1;
995
996 // expand the array and add arg to the last element
997 if (*bldarray == nullptr) {
998 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
999 } else {
1000 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1001 }
1002 (*bldarray)[*count] = os::strdup_check_oom(arg);
1003 *count = new_count;
1004 }
1005
1006 void Arguments::build_jvm_args(const char* arg) {
1007 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1008 }
1009
1010 void Arguments::build_jvm_flags(const char* arg) {
1011 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1012 }
1013
1014 // utility function to return a string that concatenates all
1015 // strings in a given char** array
1016 const char* Arguments::build_resource_string(char** args, int count) {
1017 if (args == nullptr || count == 0) {
1018 return nullptr;
1019 }
1020 size_t length = 0;
1021 for (int i = 0; i < count; i++) {
1022 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1023 }
1024 char* s = NEW_RESOURCE_ARRAY(char, length);
1025 char* dst = s;
1026 for (int j = 0; j < count; j++) {
1027 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1028 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1029 dst += offset;
1030 length -= offset;
1031 }
1032 return (const char*) s;
1033 }
1034
1035 void Arguments::print_on(outputStream* st) {
1036 st->print_cr("VM Arguments:");
1037 if (num_jvm_flags() > 0) {
1038 st->print("jvm_flags: "); print_jvm_flags_on(st);
1039 st->cr();
1040 }
1041 if (num_jvm_args() > 0) {
1042 st->print("jvm_args: "); print_jvm_args_on(st);
1043 st->cr();
1044 }
1045 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1046 if (_java_class_path != nullptr) {
1047 char* path = _java_class_path->value();
1048 size_t len = strlen(path);
1049 st->print("java_class_path (initial): ");
1050 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1051 if (len == 0) {
1052 st->print_raw_cr("<not set>");
1053 } else {
1054 st->print_raw_cr(path, len);
1055 }
1056 }
1057 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1058 }
1059
1060 void Arguments::print_summary_on(outputStream* st) {
1061 // Print the command line. Environment variables that are helpful for
1062 // reproducing the problem are written later in the hs_err file.
1063 // flags are from setting file
1064 if (num_jvm_flags() > 0) {
1065 st->print_raw("Settings File: ");
1066 print_jvm_flags_on(st);
1067 st->cr();
1068 }
1069 // args are the command line and environment variable arguments.
1070 st->print_raw("Command Line: ");
1071 if (num_jvm_args() > 0) {
1072 print_jvm_args_on(st);
1073 }
1074 // this is the classfile and any arguments to the java program
1075 if (java_command() != nullptr) {
1076 st->print("%s", java_command());
1077 }
1078 st->cr();
1079 }
1080
1081 void Arguments::print_jvm_flags_on(outputStream* st) {
1082 if (_num_jvm_flags > 0) {
1083 for (int i=0; i < _num_jvm_flags; i++) {
1084 st->print("%s ", _jvm_flags_array[i]);
1085 }
1086 }
1087 }
1088
1089 void Arguments::print_jvm_args_on(outputStream* st) {
1090 if (_num_jvm_args > 0) {
1091 for (int i=0; i < _num_jvm_args; i++) {
1092 st->print("%s ", _jvm_args_array[i]);
1093 }
1094 }
1095 }
1096
1097 bool Arguments::process_argument(const char* arg,
1098 jboolean ignore_unrecognized,
1099 JVMFlagOrigin origin) {
1100 JDK_Version since = JDK_Version();
1101
1102 if (parse_argument(arg, origin)) {
1103 return true;
1104 }
1105
1106 // Determine if the flag has '+', '-', or '=' characters.
1107 bool has_plus_minus = (*arg == '+' || *arg == '-');
1108 const char* const argname = has_plus_minus ? arg + 1 : arg;
1109
1110 size_t arg_len;
1111 const char* equal_sign = strchr(argname, '=');
1112 if (equal_sign == nullptr) {
1113 arg_len = strlen(argname);
1114 } else {
1115 arg_len = equal_sign - argname;
1116 }
1117
1118 // Only make the obsolete check for valid arguments.
1119 if (arg_len <= BUFLEN) {
1120 // Construct a string which consists only of the argument name without '+', '-', or '='.
1121 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1122 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1123 if (is_obsolete_flag(stripped_argname, &since)) {
1124 char version[256];
1125 since.to_string(version, sizeof(version));
1126 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1127 return true;
1128 }
1129 }
1130
1131 // For locked flags, report a custom error message if available.
1132 // Otherwise, report the standard unrecognized VM option.
1133 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1134 if (found_flag != nullptr) {
1135 char locked_message_buf[BUFLEN];
1136 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1137 if (strlen(locked_message_buf) != 0) {
1138 #ifdef PRODUCT
1139 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1140 if (ignore_unrecognized && mismatched) {
1141 return true;
1142 }
1143 #endif
1144 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1145 }
1146 if (found_flag->is_bool() && !has_plus_minus) {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Missing +/- setting for VM option '%s'\n", argname);
1149 } else if (!found_flag->is_bool() && has_plus_minus) {
1150 jio_fprintf(defaultStream::error_stream(),
1151 "Unexpected +/- setting in VM option '%s'\n", argname);
1152 } else {
1153 jio_fprintf(defaultStream::error_stream(),
1154 "Improperly specified VM option '%s'\n", argname);
1155 }
1156 } else {
1157 if (ignore_unrecognized) {
1158 return true;
1159 }
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Unrecognized VM option '%s'\n", argname);
1162 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1163 if (fuzzy_matched != nullptr) {
1164 jio_fprintf(defaultStream::error_stream(),
1165 "Did you mean '%s%s%s'?\n",
1166 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1167 fuzzy_matched->name(),
1168 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1169 }
1170 }
1171
1172 // allow for commandline "commenting out" options like -XX:#+Verbose
1173 return arg[0] == '#';
1174 }
1175
1176 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1177 FILE* stream = os::fopen(file_name, "rb");
1178 if (stream == nullptr) {
1179 if (should_exist) {
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Could not open settings file %s\n", file_name);
1182 return false;
1183 } else {
1184 return true;
1185 }
1186 }
1187
1188 char token[1024];
1189 int pos = 0;
1190
1191 bool in_white_space = true;
1192 bool in_comment = false;
1193 bool in_quote = false;
1194 int quote_c = 0;
1195 bool result = true;
1196
1197 int c = getc(stream);
1198 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1199 if (in_white_space) {
1200 if (in_comment) {
1201 if (c == '\n') in_comment = false;
1202 } else {
1203 if (c == '#') in_comment = true;
1204 else if (!isspace((unsigned char) c)) {
1205 in_white_space = false;
1206 token[pos++] = checked_cast<char>(c);
1207 }
1208 }
1209 } else {
1210 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1211 // token ends at newline, or at unquoted whitespace
1212 // this allows a way to include spaces in string-valued options
1213 token[pos] = '\0';
1214 logOption(token);
1215 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1216 build_jvm_flags(token);
1217 pos = 0;
1218 in_white_space = true;
1219 in_quote = false;
1220 } else if (!in_quote && (c == '\'' || c == '"')) {
1221 in_quote = true;
1222 quote_c = c;
1223 } else if (in_quote && (c == quote_c)) {
1224 in_quote = false;
1225 } else {
1226 token[pos++] = checked_cast<char>(c);
1227 }
1228 }
1229 c = getc(stream);
1230 }
1231 if (pos > 0) {
1232 token[pos] = '\0';
1233 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1234 build_jvm_flags(token);
1235 }
1236 fclose(stream);
1237 return result;
1238 }
1239
1240 //=============================================================================================================
1241 // Parsing of properties (-D)
1242
1243 const char* Arguments::get_property(const char* key) {
1244 return PropertyList_get_value(system_properties(), key);
1245 }
1246
1247 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1248 const char* eq = strchr(prop, '=');
1249 const char* key;
1250 const char* value = "";
1251
1252 if (eq == nullptr) {
1253 // property doesn't have a value, thus use passed string
1254 key = prop;
1255 } else {
1256 // property have a value, thus extract it and save to the
1257 // allocated string
1258 size_t key_len = eq - prop;
1259 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1260
1261 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1262 key = tmp_key;
1263
1264 value = &prop[key_len + 1];
1265 }
1266
1267 if (internal == ExternalProperty) {
1268 CDSConfig::check_incompatible_property(key, value);
1269 }
1270
1271 if (strcmp(key, "java.compiler") == 0) {
1272 // we no longer support java.compiler system property, log a warning and let it get
1273 // passed to Java, like any other system property
1274 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1275 // for applications using NONE or empty value, log a more informative message
1276 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1277 } else {
1278 warning("The java.compiler system property is obsolete and no longer supported.");
1279 }
1280 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1281 // sun.java.launcher.is_altjvm property is
1282 // private and is processed in process_sun_java_launcher_properties();
1283 // the sun.java.launcher property is passed on to the java application
1284 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1285 // append is true, writable is true, internal is false
1286 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1287 WriteableProperty, ExternalProperty);
1288 } else {
1289 if (strcmp(key, "sun.java.command") == 0) {
1290 char *old_java_command = _java_command;
1291 _java_command = os::strdup_check_oom(value, mtArguments);
1292 if (old_java_command != nullptr) {
1293 os::free(old_java_command);
1294 }
1295 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1296 // If this property is set on the command line then its value will be
1297 // displayed in VM error logs as the URL at which to submit such logs.
1298 // Normally the URL displayed in error logs is different from the value
1299 // of this system property, so a different property should have been
1300 // used here, but we leave this as-is in case someone depends upon it.
1301 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1302 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1303 // its value without going through the property list or making a Java call.
1304 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1305 if (old_java_vendor_url_bug != nullptr) {
1306 os::free((void *)old_java_vendor_url_bug);
1307 }
1308 }
1309
1310 // Create new property and add at the end of the list
1311 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1312 }
1313
1314 if (key != prop) {
1315 // SystemProperty copy passed value, thus free previously allocated
1316 // memory
1317 FreeHeap((void *)key);
1318 }
1319
1320 return true;
1321 }
1322
1323 //===========================================================================================================
1324 // Setting int/mixed/comp mode flags
1325
1326 void Arguments::set_mode_flags(Mode mode) {
1327 // Set up default values for all flags.
1328 // If you add a flag to any of the branches below,
1329 // add a default value for it here.
1330 _mode = mode;
1331
1332 // Ensure Agent_OnLoad has the correct initial values.
1333 // This may not be the final mode; mode may change later in onload phase.
1334 PropertyList_unique_add(&_system_properties, "java.vm.info",
1335 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1336
1337 UseInterpreter = true;
1338 UseCompiler = true;
1339 UseLoopCounter = true;
1340
1341 // Default values may be platform/compiler dependent -
1342 // use the saved values
1343 ClipInlining = Arguments::_ClipInlining;
1344 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1345 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1346 BackgroundCompilation = Arguments::_BackgroundCompilation;
1347
1348 // Change from defaults based on mode
1349 switch (mode) {
1350 default:
1351 ShouldNotReachHere();
1352 break;
1353 case _int:
1354 UseCompiler = false;
1355 UseLoopCounter = false;
1356 AlwaysCompileLoopMethods = false;
1357 UseOnStackReplacement = false;
1358 break;
1359 case _mixed:
1360 // same as default
1361 break;
1362 case _comp:
1363 UseInterpreter = false;
1364 BackgroundCompilation = false;
1365 ClipInlining = false;
1366 break;
1367 }
1368 }
1369
1370 // Conflict: required to use shared spaces (-Xshare:on), but
1371 // incompatible command line options were chosen.
1372 void Arguments::no_shared_spaces(const char* message) {
1373 if (RequireSharedSpaces) {
1374 jio_fprintf(defaultStream::error_stream(),
1375 "Class data sharing is inconsistent with other specified options.\n");
1376 vm_exit_during_initialization("Unable to use shared archive", message);
1377 } else {
1378 log_info(cds)("Unable to use shared archive: %s", message);
1379 UseSharedSpaces = false;
1380 }
1381 }
1382
1383 static void set_object_alignment() {
1384 // Object alignment.
1385 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1386 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1387 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1388 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1389 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1390 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1391
1392 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1393 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1394
1395 // Oop encoding heap max
1396 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1397 }
1398
1399 size_t Arguments::max_heap_for_compressed_oops() {
1400 // Avoid sign flip.
1401 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1402 // We need to fit both the null page and the heap into the memory budget, while
1403 // keeping alignment constraints of the heap. To guarantee the latter, as the
1404 // null page is located before the heap, we pad the null page to the conservative
1405 // maximum alignment that the GC may ever impose upon the heap.
1406 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1407 _conservative_max_heap_alignment);
1408
1409 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1410 NOT_LP64(ShouldNotReachHere(); return 0);
1411 }
1412
1413 void Arguments::set_use_compressed_oops() {
1414 #ifdef _LP64
1415 // MaxHeapSize is not set up properly at this point, but
1416 // the only value that can override MaxHeapSize if we are
1417 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1418 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1419
1420 if (max_heap_size <= max_heap_for_compressed_oops()) {
1421 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1422 FLAG_SET_ERGO(UseCompressedOops, true);
1423 }
1424 } else {
1425 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1426 warning("Max heap size too large for Compressed Oops");
1427 FLAG_SET_DEFAULT(UseCompressedOops, false);
1428 }
1429 }
1430 #endif // _LP64
1431 }
1432
1433 void Arguments::set_use_compressed_klass_ptrs() {
1434 #ifdef _LP64
1435 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1436 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1437 #endif // _LP64
1438 }
1439
1440 void Arguments::set_conservative_max_heap_alignment() {
1441 // The conservative maximum required alignment for the heap is the maximum of
1442 // the alignments imposed by several sources: any requirements from the heap
1443 // itself and the maximum page size we may run the VM with.
1444 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1445 _conservative_max_heap_alignment = MAX4(heap_alignment,
1446 os::vm_allocation_granularity(),
1447 os::max_page_size(),
1448 GCArguments::compute_heap_alignment());
1449 }
1450
1451 jint Arguments::set_ergonomics_flags() {
1452 GCConfig::initialize();
1453
1454 set_conservative_max_heap_alignment();
1455
1456 #ifdef _LP64
1457 set_use_compressed_oops();
1458 set_use_compressed_klass_ptrs();
1459
1460 // Also checks that certain machines are slower with compressed oops
1461 // in vm_version initialization code.
1462 #endif // _LP64
1463
1464 return JNI_OK;
1465 }
1466
1467 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1468 size_t max_allocatable;
1469 size_t result = limit;
1470 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1471 // The AggressiveHeap check is a temporary workaround to avoid calling
1472 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1473 // selected. This works because AggressiveHeap implies UseParallelGC
1474 // where we know the ratio will be 1. Once the AggressiveHeap option is
1475 // removed, this can be cleaned up.
1476 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1477 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1478 result = MIN2(result, max_allocatable / fraction);
1479 }
1480 return result;
1481 }
1482
1483 // Use static initialization to get the default before parsing
1484 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1485
1486 void Arguments::set_heap_size() {
1487 julong phys_mem;
1488
1489 // If the user specified one of these options, they
1490 // want specific memory sizing so do not limit memory
1491 // based on compressed oops addressability.
1492 // Also, memory limits will be calculated based on
1493 // available os physical memory, not our MaxRAM limit,
1494 // unless MaxRAM is also specified.
1495 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1496 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1497 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1498 !FLAG_IS_DEFAULT(MaxRAM));
1499 if (override_coop_limit) {
1500 if (FLAG_IS_DEFAULT(MaxRAM)) {
1501 phys_mem = os::physical_memory();
1502 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1503 } else {
1504 phys_mem = (julong)MaxRAM;
1505 }
1506 } else {
1507 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1508 : (julong)MaxRAM;
1509 }
1510
1511 // If the maximum heap size has not been set with -Xmx,
1512 // then set it as fraction of the size of physical memory,
1513 // respecting the maximum and minimum sizes of the heap.
1514 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1515 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1516 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1517 if (reasonable_min < MaxHeapSize) {
1518 // Small physical memory, so use a minimum fraction of it for the heap
1519 reasonable_max = reasonable_min;
1520 } else {
1521 // Not-small physical memory, so require a heap at least
1522 // as large as MaxHeapSize
1523 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1524 }
1525
1526 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1527 // Limit the heap size to ErgoHeapSizeLimit
1528 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1529 }
1530
1531 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1532
1533 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1534 // An initial heap size was specified on the command line,
1535 // so be sure that the maximum size is consistent. Done
1536 // after call to limit_heap_by_allocatable_memory because that
1537 // method might reduce the allocation size.
1538 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1539 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1540 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1541 }
1542
1543 #ifdef _LP64
1544 if (UseCompressedOops || UseCompressedClassPointers) {
1545 // HeapBaseMinAddress can be greater than default but not less than.
1546 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1547 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1548 // matches compressed oops printing flags
1549 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1550 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1551 DefaultHeapBaseMinAddress,
1552 DefaultHeapBaseMinAddress/G,
1553 HeapBaseMinAddress);
1554 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1555 }
1556 }
1557 }
1558 if (UseCompressedOops) {
1559 // Limit the heap size to the maximum possible when using compressed oops
1560 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1561
1562 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1563 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1564 // but it should be not less than default MaxHeapSize.
1565 max_coop_heap -= HeapBaseMinAddress;
1566 }
1567
1568 // If user specified flags prioritizing os physical
1569 // memory limits, then disable compressed oops if
1570 // limits exceed max_coop_heap and UseCompressedOops
1571 // was not specified.
1572 if (reasonable_max > max_coop_heap) {
1573 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1574 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1575 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1576 "Please check the setting of MaxRAMPercentage %5.2f."
1577 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1578 FLAG_SET_ERGO(UseCompressedOops, false);
1579 } else {
1580 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1581 }
1582 }
1583 }
1584 #endif // _LP64
1585
1586 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1587 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1588 }
1589
1590 // If the minimum or initial heap_size have not been set or requested to be set
1591 // ergonomically, set them accordingly.
1592 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1593 julong reasonable_minimum = (julong)(OldSize + NewSize);
1594
1595 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1596
1597 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1598
1599 if (InitialHeapSize == 0) {
1600 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1601 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1602
1603 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1604 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1605
1606 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1607 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1608 }
1609 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1610 // synchronize with InitialHeapSize to avoid errors with the default value.
1611 if (MinHeapSize == 0) {
1612 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1613 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1614 }
1615 }
1616 }
1617
1618 // This option inspects the machine and attempts to set various
1619 // parameters to be optimal for long-running, memory allocation
1620 // intensive jobs. It is intended for machines with large
1621 // amounts of cpu and memory.
1622 jint Arguments::set_aggressive_heap_flags() {
1623 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1624 // VM, but we may not be able to represent the total physical memory
1625 // available (like having 8gb of memory on a box but using a 32bit VM).
1626 // Thus, we need to make sure we're using a julong for intermediate
1627 // calculations.
1628 julong initHeapSize;
1629 julong total_memory = os::physical_memory();
1630
1631 if (total_memory < (julong) 256 * M) {
1632 jio_fprintf(defaultStream::error_stream(),
1633 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1634 vm_exit(1);
1635 }
1636
1637 // The heap size is half of available memory, or (at most)
1638 // all of possible memory less 160mb (leaving room for the OS
1639 // when using ISM). This is the maximum; because adaptive sizing
1640 // is turned on below, the actual space used may be smaller.
1641
1642 initHeapSize = MIN2(total_memory / (julong) 2,
1643 total_memory - (julong) 160 * M);
1644
1645 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1646
1647 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1648 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1649 return JNI_EINVAL;
1650 }
1651 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1652 return JNI_EINVAL;
1653 }
1654 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1655 return JNI_EINVAL;
1656 }
1657 }
1658 if (FLAG_IS_DEFAULT(NewSize)) {
1659 // Make the young generation 3/8ths of the total heap.
1660 if (FLAG_SET_CMDLINE(NewSize,
1661 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1662 return JNI_EINVAL;
1663 }
1664 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1665 return JNI_EINVAL;
1666 }
1667 }
1668
1669 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1670 FLAG_SET_DEFAULT(UseLargePages, true);
1671 #endif
1672
1673 // Increase some data structure sizes for efficiency
1674 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1675 return JNI_EINVAL;
1676 }
1677 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1678 return JNI_EINVAL;
1679 }
1680
1681 // See the OldPLABSize comment below, but replace 'after promotion'
1682 // with 'after copying'. YoungPLABSize is the size of the survivor
1683 // space per-gc-thread buffers. The default is 4kw.
1684 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1685 return JNI_EINVAL;
1686 }
1687
1688 // OldPLABSize is the size of the buffers in the old gen that
1689 // UseParallelGC uses to promote live data that doesn't fit in the
1690 // survivor spaces. At any given time, there's one for each gc thread.
1691 // The default size is 1kw. These buffers are rarely used, since the
1692 // survivor spaces are usually big enough. For specjbb, however, there
1693 // are occasions when there's lots of live data in the young gen
1694 // and we end up promoting some of it. We don't have a definite
1695 // explanation for why bumping OldPLABSize helps, but the theory
1696 // is that a bigger PLAB results in retaining something like the
1697 // original allocation order after promotion, which improves mutator
1698 // locality. A minor effect may be that larger PLABs reduce the
1699 // number of PLAB allocation events during gc. The value of 8kw
1700 // was arrived at by experimenting with specjbb.
1701 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1702 return JNI_EINVAL;
1703 }
1704
1705 // Enable parallel GC and adaptive generation sizing
1706 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1707 return JNI_EINVAL;
1708 }
1709
1710 // Encourage steady state memory management
1711 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1712 return JNI_EINVAL;
1713 }
1714
1715 return JNI_OK;
1716 }
1717
1718 // This must be called after ergonomics.
1719 void Arguments::set_bytecode_flags() {
1720 if (!RewriteBytecodes) {
1721 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1722 }
1723 }
1724
1725 // Aggressive optimization flags
1726 jint Arguments::set_aggressive_opts_flags() {
1727 #ifdef COMPILER2
1728 if (AggressiveUnboxing) {
1729 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1730 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1731 } else if (!EliminateAutoBox) {
1732 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1733 AggressiveUnboxing = false;
1734 }
1735 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1736 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1737 } else if (!DoEscapeAnalysis) {
1738 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1739 AggressiveUnboxing = false;
1740 }
1741 }
1742 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1743 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1744 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1745 }
1746 // Feed the cache size setting into the JDK
1747 char buffer[1024];
1748 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1749 if (!add_property(buffer)) {
1750 return JNI_ENOMEM;
1751 }
1752 }
1753 #endif
1754
1755 return JNI_OK;
1756 }
1757
1758 //===========================================================================================================
1759
1760 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1761 if (_sun_java_launcher != _default_java_launcher) {
1762 os::free(const_cast<char*>(_sun_java_launcher));
1763 }
1764 _sun_java_launcher = os::strdup_check_oom(launcher);
1765 }
1766
1767 bool Arguments::created_by_java_launcher() {
1768 assert(_sun_java_launcher != nullptr, "property must have value");
1769 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1770 }
1771
1772 bool Arguments::sun_java_launcher_is_altjvm() {
1773 return _sun_java_launcher_is_altjvm;
1774 }
1775
1776 //===========================================================================================================
1777 // Parsing of main arguments
1778
1779 unsigned int addreads_count = 0;
1780 unsigned int addexports_count = 0;
1781 unsigned int addopens_count = 0;
1782 unsigned int enable_native_access_count = 0;
1783
1784 // Check the consistency of vm_init_args
1785 bool Arguments::check_vm_args_consistency() {
1786 // Method for adding checks for flag consistency.
1787 // The intent is to warn the user of all possible conflicts,
1788 // before returning an error.
1789 // Note: Needs platform-dependent factoring.
1790 bool status = true;
1791
1792 if (TLABRefillWasteFraction == 0) {
1793 jio_fprintf(defaultStream::error_stream(),
1794 "TLABRefillWasteFraction should be a denominator, "
1795 "not " SIZE_FORMAT "\n",
1796 TLABRefillWasteFraction);
1797 status = false;
1798 }
1799
1800 status = CompilerConfig::check_args_consistency(status);
1801 #if INCLUDE_JVMCI
1802 if (status && EnableJVMCI) {
1803 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1804 AddProperty, UnwriteableProperty, InternalProperty);
1805 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1806 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1807 return false;
1808 }
1809 }
1810 }
1811 #endif
1812
1813 #if INCLUDE_JFR
1814 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1815 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1816 return false;
1817 }
1818 }
1819 #endif
1820
1821 #ifndef SUPPORT_RESERVED_STACK_AREA
1822 if (StackReservedPages != 0) {
1823 FLAG_SET_CMDLINE(StackReservedPages, 0);
1824 warning("Reserved Stack Area not supported on this platform");
1825 }
1826 #endif
1827
1828 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1829 // ObjectMonitorTable requires lightweight locking.
1830 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1831 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1832 }
1833
1834 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1835 if (LockingMode == LM_MONITOR) {
1836 jio_fprintf(defaultStream::error_stream(),
1837 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1838 return false;
1839 }
1840 #endif
1841 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1842 jio_fprintf(defaultStream::error_stream(),
1843 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1844 return false;
1845 }
1846 return status;
1847 }
1848
1849 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1850 const char* option_type) {
1851 if (ignore) return false;
1852
1853 const char* spacer = " ";
1854 if (option_type == nullptr) {
1855 option_type = ++spacer; // Set both to the empty string.
1856 }
1857
1858 jio_fprintf(defaultStream::error_stream(),
1859 "Unrecognized %s%soption: %s\n", option_type, spacer,
1860 option->optionString);
1861 return true;
1862 }
1863
1864 static const char* user_assertion_options[] = {
1865 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1866 };
1867
1868 static const char* system_assertion_options[] = {
1869 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1870 };
1871
1872 bool Arguments::parse_uint(const char* value,
1873 uint* uint_arg,
1874 uint min_size) {
1875 uint n;
1876 if (!parse_integer(value, &n)) {
1877 return false;
1878 }
1879 if (n >= min_size) {
1880 *uint_arg = n;
1881 return true;
1882 } else {
1883 return false;
1884 }
1885 }
1886
1887 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1888 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1889 CDSConfig::check_internal_module_property(prop_name, prop_value);
1890 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1891 char* property = AllocateHeap(prop_len, mtArguments);
1892 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1893 if (ret < 0 || ret >= (int)prop_len) {
1894 FreeHeap(property);
1895 return false;
1896 }
1897 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1898 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1899 // that multiple occurrences of the associated flag just causes the existing property value to be
1900 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1901 // to a property after we have finished flag processing.
1902 bool added = add_property(property, WriteableProperty, internal);
1903 FreeHeap(property);
1904 return added;
1905 }
1906
1907 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1908 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1909 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1910 const unsigned int props_count_limit = 1000;
1911 const int max_digits = 3;
1912 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1913
1914 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1915 if (count < props_count_limit) {
1916 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1917 char* property = AllocateHeap(prop_len, mtArguments);
1918 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1919 if (ret < 0 || ret >= (int)prop_len) {
1920 FreeHeap(property);
1921 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1922 return false;
1923 }
1924 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1925 FreeHeap(property);
1926 return added;
1927 }
1928
1929 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1930 return false;
1931 }
1932
1933 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1934 julong* long_arg,
1935 julong min_size,
1936 julong max_size) {
1937 if (!parse_integer(s, long_arg)) return arg_unreadable;
1938 return check_memory_size(*long_arg, min_size, max_size);
1939 }
1940
1941 // Parse JavaVMInitArgs structure
1942
1943 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1944 const JavaVMInitArgs *java_tool_options_args,
1945 const JavaVMInitArgs *java_options_args,
1946 const JavaVMInitArgs *cmd_line_args) {
1947 // Save default settings for some mode flags
1948 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1949 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1950 Arguments::_ClipInlining = ClipInlining;
1951 Arguments::_BackgroundCompilation = BackgroundCompilation;
1952
1953 // Remember the default value of SharedBaseAddress.
1954 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1955
1956 // Setup flags for mixed which is the default
1957 set_mode_flags(_mixed);
1958
1959 // Parse args structure generated from java.base vm options resource
1960 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1961 if (result != JNI_OK) {
1962 return result;
1963 }
1964
1965 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1966 // variable (if present).
1967 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1968 if (result != JNI_OK) {
1969 return result;
1970 }
1971
1972 // Parse args structure generated from the command line flags.
1973 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1974 if (result != JNI_OK) {
1975 return result;
1976 }
1977
1978 // Parse args structure generated from the _JAVA_OPTIONS environment
1979 // variable (if present) (mimics classic VM)
1980 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1981 if (result != JNI_OK) {
1982 return result;
1983 }
1984
1985 // Disable CDS for exploded image
1986 if (!has_jimage()) {
1987 no_shared_spaces("CDS disabled on exploded JDK");
1988 }
1989
1990 // We need to ensure processor and memory resources have been properly
1991 // configured - which may rely on arguments we just processed - before
1992 // doing the final argument processing. Any argument processing that
1993 // needs to know about processor and memory resources must occur after
1994 // this point.
1995
1996 os::init_container_support();
1997
1998 SystemMemoryBarrier::initialize();
1999
2000 // Do final processing now that all arguments have been parsed
2001 result = finalize_vm_init_args();
2002 if (result != JNI_OK) {
2003 return result;
2004 }
2005
2006 return JNI_OK;
2007 }
2008
2009 #if !INCLUDE_JVMTI
2010 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2011 // represents a valid JDWP agent. is_path==true denotes that we
2012 // are dealing with -agentpath (case where name is a path), otherwise with
2013 // -agentlib
2014 static bool valid_jdwp_agent(char *name, bool is_path) {
2015 char *_name;
2016 const char *_jdwp = "jdwp";
2017 size_t _len_jdwp, _len_prefix;
2018
2019 if (is_path) {
2020 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2021 return false;
2022 }
2023
2024 _name++; // skip past last path separator
2025 _len_prefix = strlen(JNI_LIB_PREFIX);
2026
2027 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2028 return false;
2029 }
2030
2031 _name += _len_prefix;
2032 _len_jdwp = strlen(_jdwp);
2033
2034 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2035 _name += _len_jdwp;
2036 }
2037 else {
2038 return false;
2039 }
2040
2041 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2042 return false;
2043 }
2044
2045 return true;
2046 }
2047
2048 if (strcmp(name, _jdwp) == 0) {
2049 return true;
2050 }
2051
2052 return false;
2053 }
2054 #endif
2055
2056 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2057 // --patch-module=<module>=<file>(<pathsep><file>)*
2058 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2059 // Find the equal sign between the module name and the path specification
2060 const char* module_equal = strchr(patch_mod_tail, '=');
2061 if (module_equal == nullptr) {
2062 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2063 return JNI_ERR;
2064 } else {
2065 // Pick out the module name
2066 size_t module_len = module_equal - patch_mod_tail;
2067 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2068 if (module_name != nullptr) {
2069 memcpy(module_name, patch_mod_tail, module_len);
2070 *(module_name + module_len) = '\0';
2071 // The path piece begins one past the module_equal sign
2072 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2073 FREE_C_HEAP_ARRAY(char, module_name);
2074 } else {
2075 return JNI_ENOMEM;
2076 }
2077 }
2078 return JNI_OK;
2079 }
2080
2081 // VALUECLASS_STR must match string used in the build
2082 #define VALUECLASS_STR "valueclasses"
2083 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2084
2085 // Finalize --patch-module args and --enable-preview related to value class module patches.
2086 // Create all numbered properties passing module patches.
2087 int Arguments::finalize_patch_module() {
2088 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2089 // are to be patched into the module.
2090 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2091 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2092 if (enable_preview() && EnableValhalla) {
2093 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2094 const char * fileSep = os::file_separator();
2095
2096 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2097 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2098 DIR* dir = os::opendir(valueclasses_dir);
2099 if (dir != nullptr) {
2100 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2101 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2102
2103 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2104 // Test if file ends-with "-valueclasses.jar"
2105 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2106 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2107 continue; // too short or not the expected suffix
2108 }
2109
2110 strcpy(module_name, entry->d_name);
2111 module_name[len] = '\0'; // truncate to just module-name
2112
2113 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2114 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2115 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2116 }
2117 FreeHeap(module_name);
2118 FreeHeap(path);
2119 os::closedir(dir);
2120 }
2121 FreeHeap(valueclasses_dir);
2122 }
2123
2124 // Create numbered properties for each module that has been patched either
2125 // by --patch-module or --enable-preview
2126 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2127 if (_patch_mod_prefix != nullptr) {
2128 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2129 unsigned int patch_mod_count = 0;
2130
2131 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2132 it != _patch_mod_prefix->end(); ++it) {
2133 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2134 (*it)->module_name(), (*it)->path_string());
2135 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2136 FreeHeap(prop_value);
2137 return JNI_ENOMEM;
2138 }
2139 }
2140 FreeHeap(prop_value);
2141 }
2142 return JNI_OK;
2143 }
2144
2145 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2146 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2147 // The min and max sizes match the values in globals.hpp, but scaled
2148 // with K. The values have been chosen so that alignment with page
2149 // size doesn't change the max value, which makes the conversions
2150 // back and forth between Xss value and ThreadStackSize value easier.
2151 // The values have also been chosen to fit inside a 32-bit signed type.
2152 const julong min_ThreadStackSize = 0;
2153 const julong max_ThreadStackSize = 1 * M;
2154
2155 // Make sure the above values match the range set in globals.hpp
2156 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2157 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2158 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2159
2160 const julong min_size = min_ThreadStackSize * K;
2161 const julong max_size = max_ThreadStackSize * K;
2162
2163 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2164
2165 julong size = 0;
2166 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2167 if (errcode != arg_in_range) {
2168 bool silent = (option == nullptr); // Allow testing to silence error messages
2169 if (!silent) {
2170 jio_fprintf(defaultStream::error_stream(),
2171 "Invalid thread stack size: %s\n", option->optionString);
2172 describe_range_error(errcode);
2173 }
2174 return JNI_EINVAL;
2175 }
2176
2177 // Internally track ThreadStackSize in units of 1024 bytes.
2178 const julong size_aligned = align_up(size, K);
2179 assert(size <= size_aligned,
2180 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2181 size, size_aligned);
2182
2183 const julong size_in_K = size_aligned / K;
2184 assert(size_in_K < (julong)max_intx,
2185 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2186 size_in_K);
2187
2188 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2189 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2190 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2191 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2192 max_expanded, size_in_K);
2193
2194 *out_ThreadStackSize = (intx)size_in_K;
2195
2196 return JNI_OK;
2197 }
2198
2199 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2200 // For match_option to return remaining or value part of option string
2201 const char* tail;
2202
2203 // iterate over arguments
2204 for (int index = 0; index < args->nOptions; index++) {
2205 bool is_absolute_path = false; // for -agentpath vs -agentlib
2206
2207 const JavaVMOption* option = args->options + index;
2208
2209 if (!match_option(option, "-Djava.class.path", &tail) &&
2210 !match_option(option, "-Dsun.java.command", &tail) &&
2211 !match_option(option, "-Dsun.java.launcher", &tail)) {
2212
2213 // add all jvm options to the jvm_args string. This string
2214 // is used later to set the java.vm.args PerfData string constant.
2215 // the -Djava.class.path and the -Dsun.java.command options are
2216 // omitted from jvm_args string as each have their own PerfData
2217 // string constant object.
2218 build_jvm_args(option->optionString);
2219 }
2220
2221 // -verbose:[class/module/gc/jni]
2222 if (match_option(option, "-verbose", &tail)) {
2223 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2224 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2225 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2226 } else if (!strcmp(tail, ":module")) {
2227 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2228 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2229 } else if (!strcmp(tail, ":gc")) {
2230 if (_legacyGCLogging.lastFlag == 0) {
2231 _legacyGCLogging.lastFlag = 1;
2232 }
2233 } else if (!strcmp(tail, ":jni")) {
2234 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2235 }
2236 // -da / -ea / -disableassertions / -enableassertions
2237 // These accept an optional class/package name separated by a colon, e.g.,
2238 // -da:java.lang.Thread.
2239 } else if (match_option(option, user_assertion_options, &tail, true)) {
2240 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2241 if (*tail == '\0') {
2242 JavaAssertions::setUserClassDefault(enable);
2243 } else {
2244 assert(*tail == ':', "bogus match by match_option()");
2245 JavaAssertions::addOption(tail + 1, enable);
2246 }
2247 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2248 } else if (match_option(option, system_assertion_options, &tail, false)) {
2249 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2250 JavaAssertions::setSystemClassDefault(enable);
2251 // -bootclasspath:
2252 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2253 jio_fprintf(defaultStream::output_stream(),
2254 "-Xbootclasspath is no longer a supported option.\n");
2255 return JNI_EINVAL;
2256 // -bootclasspath/a:
2257 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2258 Arguments::append_sysclasspath(tail);
2259 // -bootclasspath/p:
2260 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2261 jio_fprintf(defaultStream::output_stream(),
2262 "-Xbootclasspath/p is no longer a supported option.\n");
2263 return JNI_EINVAL;
2264 // -Xrun
2265 } else if (match_option(option, "-Xrun", &tail)) {
2266 if (tail != nullptr) {
2267 const char* pos = strchr(tail, ':');
2268 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2269 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2270 jio_snprintf(name, len + 1, "%s", tail);
2271
2272 char *options = nullptr;
2273 if(pos != nullptr) {
2274 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2275 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2276 }
2277 #if !INCLUDE_JVMTI
2278 if (strcmp(name, "jdwp") == 0) {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "Debugging agents are not supported in this VM\n");
2281 return JNI_ERR;
2282 }
2283 #endif // !INCLUDE_JVMTI
2284 JvmtiAgentList::add_xrun(name, options, false);
2285 FREE_C_HEAP_ARRAY(char, name);
2286 FREE_C_HEAP_ARRAY(char, options);
2287 }
2288 } else if (match_option(option, "--add-reads=", &tail)) {
2289 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2290 return JNI_ENOMEM;
2291 }
2292 } else if (match_option(option, "--add-exports=", &tail)) {
2293 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2294 return JNI_ENOMEM;
2295 }
2296 } else if (match_option(option, "--add-opens=", &tail)) {
2297 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2298 return JNI_ENOMEM;
2299 }
2300 } else if (match_option(option, "--add-modules=", &tail)) {
2301 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2302 return JNI_ENOMEM;
2303 }
2304 } else if (match_option(option, "--enable-native-access=", &tail)) {
2305 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2306 return JNI_ENOMEM;
2307 }
2308 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2309 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2310 return JNI_ENOMEM;
2311 }
2312 } else if (match_option(option, "--limit-modules=", &tail)) {
2313 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2314 return JNI_ENOMEM;
2315 }
2316 } else if (match_option(option, "--module-path=", &tail)) {
2317 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2318 return JNI_ENOMEM;
2319 }
2320 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2321 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2322 return JNI_ENOMEM;
2323 }
2324 } else if (match_option(option, "--patch-module=", &tail)) {
2325 // --patch-module=<module>=<file>(<pathsep><file>)*
2326 int res = process_patch_mod_option(tail);
2327 if (res != JNI_OK) {
2328 return res;
2329 }
2330 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2331 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2332 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2333 AddProperty, WriteableProperty, InternalProperty);
2334 } else {
2335 jio_fprintf(defaultStream::error_stream(),
2336 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2337 return JNI_ERR;
2338 }
2339 } else if (match_option(option, "--illegal-access=", &tail)) {
2340 char version[256];
2341 JDK_Version::jdk(17).to_string(version, sizeof(version));
2342 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2343 // -agentlib and -agentpath
2344 } else if (match_option(option, "-agentlib:", &tail) ||
2345 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2346 if(tail != nullptr) {
2347 const char* pos = strchr(tail, '=');
2348 char* name;
2349 if (pos == nullptr) {
2350 name = os::strdup_check_oom(tail, mtArguments);
2351 } else {
2352 size_t len = pos - tail;
2353 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2354 memcpy(name, tail, len);
2355 name[len] = '\0';
2356 }
2357
2358 char *options = nullptr;
2359 if(pos != nullptr) {
2360 options = os::strdup_check_oom(pos + 1, mtArguments);
2361 }
2362 #if !INCLUDE_JVMTI
2363 if (valid_jdwp_agent(name, is_absolute_path)) {
2364 jio_fprintf(defaultStream::error_stream(),
2365 "Debugging agents are not supported in this VM\n");
2366 return JNI_ERR;
2367 }
2368 #endif // !INCLUDE_JVMTI
2369 JvmtiAgentList::add(name, options, is_absolute_path);
2370 os::free(name);
2371 os::free(options);
2372 }
2373 // -javaagent
2374 } else if (match_option(option, "-javaagent:", &tail)) {
2375 #if !INCLUDE_JVMTI
2376 jio_fprintf(defaultStream::error_stream(),
2377 "Instrumentation agents are not supported in this VM\n");
2378 return JNI_ERR;
2379 #else
2380 if (tail != nullptr) {
2381 size_t length = strlen(tail) + 1;
2382 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2383 jio_snprintf(options, length, "%s", tail);
2384 JvmtiAgentList::add("instrument", options, false);
2385 FREE_C_HEAP_ARRAY(char, options);
2386
2387 // java agents need module java.instrument
2388 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2389 return JNI_ENOMEM;
2390 }
2391 }
2392 #endif // !INCLUDE_JVMTI
2393 // --enable_preview
2394 } else if (match_option(option, "--enable-preview")) {
2395 set_enable_preview();
2396 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2397 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2398 return JNI_EINVAL;
2399 }
2400 // -Xnoclassgc
2401 } else if (match_option(option, "-Xnoclassgc")) {
2402 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2403 return JNI_EINVAL;
2404 }
2405 // -Xbatch
2406 } else if (match_option(option, "-Xbatch")) {
2407 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2408 return JNI_EINVAL;
2409 }
2410 // -Xmn for compatibility with other JVM vendors
2411 } else if (match_option(option, "-Xmn", &tail)) {
2412 julong long_initial_young_size = 0;
2413 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2414 if (errcode != arg_in_range) {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Invalid initial young generation size: %s\n", option->optionString);
2417 describe_range_error(errcode);
2418 return JNI_EINVAL;
2419 }
2420 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2424 return JNI_EINVAL;
2425 }
2426 // -Xms
2427 } else if (match_option(option, "-Xms", &tail)) {
2428 julong size = 0;
2429 // an initial heap size of 0 means automatically determine
2430 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2431 if (errcode != arg_in_range) {
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Invalid initial heap size: %s\n", option->optionString);
2434 describe_range_error(errcode);
2435 return JNI_EINVAL;
2436 }
2437 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2438 return JNI_EINVAL;
2439 }
2440 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2441 return JNI_EINVAL;
2442 }
2443 // -Xmx
2444 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2445 julong long_max_heap_size = 0;
2446 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2447 if (errcode != arg_in_range) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Invalid maximum heap size: %s\n", option->optionString);
2450 describe_range_error(errcode);
2451 return JNI_EINVAL;
2452 }
2453 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 // Xmaxf
2457 } else if (match_option(option, "-Xmaxf", &tail)) {
2458 char* err;
2459 int maxf = (int)(strtod(tail, &err) * 100);
2460 if (*err != '\0' || *tail == '\0') {
2461 jio_fprintf(defaultStream::error_stream(),
2462 "Bad max heap free percentage size: %s\n",
2463 option->optionString);
2464 return JNI_EINVAL;
2465 } else {
2466 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2467 return JNI_EINVAL;
2468 }
2469 }
2470 // Xminf
2471 } else if (match_option(option, "-Xminf", &tail)) {
2472 char* err;
2473 int minf = (int)(strtod(tail, &err) * 100);
2474 if (*err != '\0' || *tail == '\0') {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Bad min heap free percentage size: %s\n",
2477 option->optionString);
2478 return JNI_EINVAL;
2479 } else {
2480 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2481 return JNI_EINVAL;
2482 }
2483 }
2484 // -Xss
2485 } else if (match_option(option, "-Xss", &tail)) {
2486 intx value = 0;
2487 jint err = parse_xss(option, tail, &value);
2488 if (err != JNI_OK) {
2489 return err;
2490 }
2491 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2492 return JNI_EINVAL;
2493 }
2494 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2495 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2496 julong long_ReservedCodeCacheSize = 0;
2497
2498 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2499 if (errcode != arg_in_range) {
2500 jio_fprintf(defaultStream::error_stream(),
2501 "Invalid maximum code cache size: %s.\n", option->optionString);
2502 return JNI_EINVAL;
2503 }
2504 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2505 return JNI_EINVAL;
2506 }
2507 // -green
2508 } else if (match_option(option, "-green")) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Green threads support not available\n");
2511 return JNI_EINVAL;
2512 // -native
2513 } else if (match_option(option, "-native")) {
2514 // HotSpot always uses native threads, ignore silently for compatibility
2515 // -Xrs
2516 } else if (match_option(option, "-Xrs")) {
2517 // Classic/EVM option, new functionality
2518 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2519 return JNI_EINVAL;
2520 }
2521 // -Xprof
2522 } else if (match_option(option, "-Xprof")) {
2523 char version[256];
2524 // Obsolete in JDK 10
2525 JDK_Version::jdk(10).to_string(version, sizeof(version));
2526 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2527 // -Xinternalversion
2528 } else if (match_option(option, "-Xinternalversion")) {
2529 jio_fprintf(defaultStream::output_stream(), "%s\n",
2530 VM_Version::internal_vm_info_string());
2531 vm_exit(0);
2532 #ifndef PRODUCT
2533 // -Xprintflags
2534 } else if (match_option(option, "-Xprintflags")) {
2535 JVMFlag::printFlags(tty, false);
2536 vm_exit(0);
2537 #endif
2538 // -D
2539 } else if (match_option(option, "-D", &tail)) {
2540 const char* value;
2541 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2542 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2543 // abort if -Djava.endorsed.dirs is set
2544 jio_fprintf(defaultStream::output_stream(),
2545 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2546 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2547 return JNI_EINVAL;
2548 }
2549 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2550 *value != '\0' && strcmp(value, "\"\"") != 0) {
2551 // abort if -Djava.ext.dirs is set
2552 jio_fprintf(defaultStream::output_stream(),
2553 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2554 return JNI_EINVAL;
2555 }
2556 // Check for module related properties. They must be set using the modules
2557 // options. For example: use "--add-modules=java.sql", not
2558 // "-Djdk.module.addmods=java.sql"
2559 if (is_internal_module_property(option->optionString + 2)) {
2560 needs_module_property_warning = true;
2561 continue;
2562 }
2563 if (!add_property(tail)) {
2564 return JNI_ENOMEM;
2565 }
2566 // Out of the box management support
2567 if (match_option(option, "-Dcom.sun.management", &tail)) {
2568 #if INCLUDE_MANAGEMENT
2569 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2570 return JNI_EINVAL;
2571 }
2572 // management agent in module jdk.management.agent
2573 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2574 return JNI_ENOMEM;
2575 }
2576 #else
2577 jio_fprintf(defaultStream::output_stream(),
2578 "-Dcom.sun.management is not supported in this VM.\n");
2579 return JNI_ERR;
2580 #endif
2581 }
2582 // -Xint
2583 } else if (match_option(option, "-Xint")) {
2584 set_mode_flags(_int);
2585 mode_flag_cmd_line = true;
2586 // -Xmixed
2587 } else if (match_option(option, "-Xmixed")) {
2588 set_mode_flags(_mixed);
2589 mode_flag_cmd_line = true;
2590 // -Xcomp
2591 } else if (match_option(option, "-Xcomp")) {
2592 // for testing the compiler; turn off all flags that inhibit compilation
2593 set_mode_flags(_comp);
2594 mode_flag_cmd_line = true;
2595 // -Xshare:dump
2596 } else if (match_option(option, "-Xshare:dump")) {
2597 CDSConfig::enable_dumping_static_archive();
2598 // -Xshare:on
2599 } else if (match_option(option, "-Xshare:on")) {
2600 UseSharedSpaces = true;
2601 RequireSharedSpaces = true;
2602 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2603 } else if (match_option(option, "-Xshare:auto")) {
2604 UseSharedSpaces = true;
2605 RequireSharedSpaces = false;
2606 xshare_auto_cmd_line = true;
2607 // -Xshare:off
2608 } else if (match_option(option, "-Xshare:off")) {
2609 UseSharedSpaces = false;
2610 RequireSharedSpaces = false;
2611 // -Xverify
2612 } else if (match_option(option, "-Xverify", &tail)) {
2613 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2614 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2615 return JNI_EINVAL;
2616 }
2617 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2618 return JNI_EINVAL;
2619 }
2620 } else if (strcmp(tail, ":remote") == 0) {
2621 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2622 return JNI_EINVAL;
2623 }
2624 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2625 return JNI_EINVAL;
2626 }
2627 } else if (strcmp(tail, ":none") == 0) {
2628 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2632 return JNI_EINVAL;
2633 }
2634 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2635 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2636 return JNI_EINVAL;
2637 }
2638 // -Xdebug
2639 } else if (match_option(option, "-Xdebug")) {
2640 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2641 } else if (match_option(option, "-Xloggc:", &tail)) {
2642 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2643 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2644 _legacyGCLogging.lastFlag = 2;
2645 _legacyGCLogging.file = os::strdup_check_oom(tail);
2646 } else if (match_option(option, "-Xlog", &tail)) {
2647 bool ret = false;
2648 if (strcmp(tail, ":help") == 0) {
2649 fileStream stream(defaultStream::output_stream());
2650 LogConfiguration::print_command_line_help(&stream);
2651 vm_exit(0);
2652 } else if (strcmp(tail, ":disable") == 0) {
2653 LogConfiguration::disable_logging();
2654 ret = true;
2655 } else if (strcmp(tail, ":async") == 0) {
2656 LogConfiguration::set_async_mode(true);
2657 ret = true;
2658 } else if (*tail == '\0') {
2659 ret = LogConfiguration::parse_command_line_arguments();
2660 assert(ret, "-Xlog without arguments should never fail to parse");
2661 } else if (*tail == ':') {
2662 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2663 }
2664 if (ret == false) {
2665 jio_fprintf(defaultStream::error_stream(),
2666 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2667 tail);
2668 return JNI_EINVAL;
2669 }
2670 // JNI hooks
2671 } else if (match_option(option, "-Xcheck", &tail)) {
2672 if (!strcmp(tail, ":jni")) {
2673 #if !INCLUDE_JNI_CHECK
2674 warning("JNI CHECKING is not supported in this VM");
2675 #else
2676 CheckJNICalls = true;
2677 #endif // INCLUDE_JNI_CHECK
2678 } else if (is_bad_option(option, args->ignoreUnrecognized,
2679 "check")) {
2680 return JNI_EINVAL;
2681 }
2682 } else if (match_option(option, "vfprintf")) {
2683 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2684 } else if (match_option(option, "exit")) {
2685 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2686 } else if (match_option(option, "abort")) {
2687 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2688 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2689 // and the last option wins.
2690 } else if (match_option(option, "-XX:+NeverTenure")) {
2691 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2692 return JNI_EINVAL;
2693 }
2694 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2701 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2711 uint max_tenuring_thresh = 0;
2712 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2713 jio_fprintf(defaultStream::error_stream(),
2714 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2715 return JNI_EINVAL;
2716 }
2717
2718 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2719 return JNI_EINVAL;
2720 }
2721
2722 if (MaxTenuringThreshold == 0) {
2723 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 } else {
2730 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736 }
2737 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2738 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2739 return JNI_EINVAL;
2740 }
2741 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2745 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2752 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2759 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 } else if (match_option(option, "--finalization=", &tail)) {
2766 if (strcmp(tail, "enabled") == 0) {
2767 InstanceKlass::set_finalization_enabled(true);
2768 } else if (strcmp(tail, "disabled") == 0) {
2769 InstanceKlass::set_finalization_enabled(false);
2770 } else {
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2773 tail);
2774 return JNI_EINVAL;
2775 }
2776 #if !defined(DTRACE_ENABLED)
2777 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2778 jio_fprintf(defaultStream::error_stream(),
2779 "DTraceMethodProbes flag is not applicable for this configuration\n");
2780 return JNI_EINVAL;
2781 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "DTraceAllocProbes flag is not applicable for this configuration\n");
2784 return JNI_EINVAL;
2785 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2788 return JNI_EINVAL;
2789 #endif // !defined(DTRACE_ENABLED)
2790 #ifdef ASSERT
2791 } else if (match_option(option, "-XX:+FullGCALot")) {
2792 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2793 return JNI_EINVAL;
2794 }
2795 #endif
2796 #if !INCLUDE_MANAGEMENT
2797 } else if (match_option(option, "-XX:+ManagementServer")) {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "ManagementServer is not supported in this VM.\n");
2800 return JNI_ERR;
2801 #endif // INCLUDE_MANAGEMENT
2802 #if INCLUDE_JVMCI
2803 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2804 if (EnableJVMCIProduct) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2807 return JNI_EINVAL;
2808 }
2809 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2810 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2811 if (use_graal_jit) {
2812 const char* jvmci_compiler = get_property("jvmci.Compiler");
2813 if (jvmci_compiler != nullptr) {
2814 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2815 jio_fprintf(defaultStream::error_stream(),
2816 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2817 return JNI_ERR;
2818 }
2819 } else if (!add_property("jvmci.Compiler=graal")) {
2820 return JNI_ENOMEM;
2821 }
2822 }
2823
2824 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2825 if (EnableJVMCIProduct) {
2826 continue;
2827 }
2828 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2829 // Allow this flag if it has been unlocked.
2830 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2831 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "Unable to enable JVMCI in product mode\n");
2834 return JNI_ERR;
2835 }
2836 }
2837 // The flag was locked so process normally to report that error
2838 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2839 return JNI_EINVAL;
2840 }
2841 #endif // INCLUDE_JVMCI
2842 #if INCLUDE_JFR
2843 } else if (match_jfr_option(&option)) {
2844 return JNI_EINVAL;
2845 #endif
2846 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2847 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2848 // already been handled
2849 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2850 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2851 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2852 return JNI_EINVAL;
2853 }
2854 }
2855 // Unknown option
2856 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2857 return JNI_ERR;
2858 }
2859 }
2860
2861 // PrintSharedArchiveAndExit will turn on
2862 // -Xshare:on
2863 // -Xlog:class+path=info
2864 if (PrintSharedArchiveAndExit) {
2865 UseSharedSpaces = true;
2866 RequireSharedSpaces = true;
2867 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2868 }
2869
2870 fix_appclasspath();
2871
2872 return JNI_OK;
2873 }
2874
2875 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2876 if (!allow_cds) {
2877 CDSConfig::set_module_patching_disables_cds();
2878 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2879 CDSConfig::set_java_base_module_patching_disables_cds();
2880 }
2881 }
2882
2883 // Create GrowableArray lazily, only if --patch-module has been specified
2884 if (_patch_mod_prefix == nullptr) {
2885 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2886 }
2887
2888 // Scan patches for matching module
2889 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2890 return (strcmp(module_name, patch->module_name()) == 0);
2891 });
2892 if (i == -1) {
2893 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2894 } else {
2895 if (allow_append) {
2896 // append path to existing module entry
2897 _patch_mod_prefix->at(i)->append_path(path);
2898 } else {
2899 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2900 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2901 } else {
2902 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2903 }
2904 }
2905 }
2906 }
2907
2908 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2909 //
2910 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2911 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2912 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2913 // path is treated as the current directory.
2914 //
2915 // This causes problems with CDS, which requires that all directories specified in the classpath
2916 // must be empty. In most cases, applications do NOT want to load classes from the current
2917 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2918 // scripts compatible with CDS.
2919 void Arguments::fix_appclasspath() {
2920 if (IgnoreEmptyClassPaths) {
2921 const char separator = *os::path_separator();
2922 const char* src = _java_class_path->value();
2923
2924 // skip over all the leading empty paths
2925 while (*src == separator) {
2926 src ++;
2927 }
2928
2929 char* copy = os::strdup_check_oom(src, mtArguments);
2930
2931 // trim all trailing empty paths
2932 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2933 *tail = '\0';
2934 }
2935
2936 char from[3] = {separator, separator, '\0'};
2937 char to [2] = {separator, '\0'};
2938 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2939 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2940 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2941 }
2942
2943 _java_class_path->set_writeable_value(copy);
2944 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2945 }
2946 }
2947
2948 jint Arguments::finalize_vm_init_args() {
2949 // check if the default lib/endorsed directory exists; if so, error
2950 char path[JVM_MAXPATHLEN];
2951 const char* fileSep = os::file_separator();
2952 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2953
2954 DIR* dir = os::opendir(path);
2955 if (dir != nullptr) {
2956 jio_fprintf(defaultStream::output_stream(),
2957 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2958 "in modular form will be supported via the concept of upgradeable modules.\n");
2959 os::closedir(dir);
2960 return JNI_ERR;
2961 }
2962
2963 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2964 dir = os::opendir(path);
2965 if (dir != nullptr) {
2966 jio_fprintf(defaultStream::output_stream(),
2967 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2968 "Use -classpath instead.\n.");
2969 os::closedir(dir);
2970 return JNI_ERR;
2971 }
2972
2973 // This must be done after all arguments have been processed
2974 // and the container support has been initialized since AggressiveHeap
2975 // relies on the amount of total memory available.
2976 if (AggressiveHeap) {
2977 jint result = set_aggressive_heap_flags();
2978 if (result != JNI_OK) {
2979 return result;
2980 }
2981 }
2982
2983 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2984 // but like -Xint, leave compilation thresholds unaffected.
2985 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2986 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2987 set_mode_flags(_int);
2988 }
2989
2990 #ifdef ZERO
2991 // Zero always runs in interpreted mode
2992 set_mode_flags(_int);
2993 #endif
2994
2995 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2996 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2997 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2998 }
2999
3000 #if !COMPILER2_OR_JVMCI
3001 // Don't degrade server performance for footprint
3002 if (FLAG_IS_DEFAULT(UseLargePages) &&
3003 MaxHeapSize < LargePageHeapSizeThreshold) {
3004 // No need for large granularity pages w/small heaps.
3005 // Note that large pages are enabled/disabled for both the
3006 // Java heap and the code cache.
3007 FLAG_SET_DEFAULT(UseLargePages, false);
3008 }
3009
3010 UNSUPPORTED_OPTION(ProfileInterpreter);
3011 #endif
3012
3013 // Parse the CompilationMode flag
3014 if (!CompilationModeFlag::initialize()) {
3015 return JNI_ERR;
3016 }
3017
3018 if (!check_vm_args_consistency()) {
3019 return JNI_ERR;
3020 }
3021
3022 // finalize --module-patch and related --enable-preview
3023 if (finalize_patch_module() != JNI_OK) {
3024 return JNI_ERR;
3025 }
3026
3027 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
3028 return JNI_ERR;
3029 }
3030
3031 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3032 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3033 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3034
3035 return JNI_OK;
3036 }
3037
3038 // Helper class for controlling the lifetime of JavaVMInitArgs
3039 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3040 // deleted on the destruction of the ScopedVMInitArgs object.
3041 class ScopedVMInitArgs : public StackObj {
3042 private:
3043 JavaVMInitArgs _args;
3044 char* _container_name;
3045 bool _is_set;
3046 char* _vm_options_file_arg;
3047
3048 public:
3049 ScopedVMInitArgs(const char *container_name) {
3050 _args.version = JNI_VERSION_1_2;
3051 _args.nOptions = 0;
3052 _args.options = nullptr;
3053 _args.ignoreUnrecognized = false;
3054 _container_name = (char *)container_name;
3055 _is_set = false;
3056 _vm_options_file_arg = nullptr;
3057 }
3058
3059 // Populates the JavaVMInitArgs object represented by this
3060 // ScopedVMInitArgs object with the arguments in options. The
3061 // allocated memory is deleted by the destructor. If this method
3062 // returns anything other than JNI_OK, then this object is in a
3063 // partially constructed state, and should be abandoned.
3064 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3065 _is_set = true;
3066 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3067 JavaVMOption, options->length(), mtArguments);
3068 if (options_arr == nullptr) {
3069 return JNI_ENOMEM;
3070 }
3071 _args.options = options_arr;
3072
3073 for (int i = 0; i < options->length(); i++) {
3074 options_arr[i] = options->at(i);
3075 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3076 if (options_arr[i].optionString == nullptr) {
3077 // Rely on the destructor to do cleanup.
3078 _args.nOptions = i;
3079 return JNI_ENOMEM;
3080 }
3081 }
3082
3083 _args.nOptions = options->length();
3084 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3085 return JNI_OK;
3086 }
3087
3088 JavaVMInitArgs* get() { return &_args; }
3089 char* container_name() { return _container_name; }
3090 bool is_set() { return _is_set; }
3091 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3092 char* vm_options_file_arg() { return _vm_options_file_arg; }
3093
3094 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3095 if (_vm_options_file_arg != nullptr) {
3096 os::free(_vm_options_file_arg);
3097 }
3098 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3099 }
3100
3101 ~ScopedVMInitArgs() {
3102 if (_vm_options_file_arg != nullptr) {
3103 os::free(_vm_options_file_arg);
3104 }
3105 if (_args.options == nullptr) return;
3106 for (int i = 0; i < _args.nOptions; i++) {
3107 os::free(_args.options[i].optionString);
3108 }
3109 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3110 }
3111
3112 // Insert options into this option list, to replace option at
3113 // vm_options_file_pos (-XX:VMOptionsFile)
3114 jint insert(const JavaVMInitArgs* args,
3115 const JavaVMInitArgs* args_to_insert,
3116 const int vm_options_file_pos) {
3117 assert(_args.options == nullptr, "shouldn't be set yet");
3118 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3119 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3120
3121 int length = args->nOptions + args_to_insert->nOptions - 1;
3122 // Construct new option array
3123 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3124 for (int i = 0; i < args->nOptions; i++) {
3125 if (i == vm_options_file_pos) {
3126 // insert the new options starting at the same place as the
3127 // -XX:VMOptionsFile option
3128 for (int j = 0; j < args_to_insert->nOptions; j++) {
3129 options.push(args_to_insert->options[j]);
3130 }
3131 } else {
3132 options.push(args->options[i]);
3133 }
3134 }
3135 // make into options array
3136 return set_args(&options);
3137 }
3138 };
3139
3140 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3141 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3142 }
3143
3144 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3145 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3146 }
3147
3148 jint Arguments::parse_options_environment_variable(const char* name,
3149 ScopedVMInitArgs* vm_args) {
3150 char *buffer = ::getenv(name);
3151
3152 // Don't check this environment variable if user has special privileges
3153 // (e.g. unix su command).
3154 if (buffer == nullptr || os::have_special_privileges()) {
3155 return JNI_OK;
3156 }
3157
3158 if ((buffer = os::strdup(buffer)) == nullptr) {
3159 return JNI_ENOMEM;
3160 }
3161
3162 jio_fprintf(defaultStream::error_stream(),
3163 "Picked up %s: %s\n", name, buffer);
3164
3165 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3166
3167 os::free(buffer);
3168 return retcode;
3169 }
3170
3171 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3172 // read file into buffer
3173 int fd = ::open(file_name, O_RDONLY);
3174 if (fd < 0) {
3175 jio_fprintf(defaultStream::error_stream(),
3176 "Could not open options file '%s'\n",
3177 file_name);
3178 return JNI_ERR;
3179 }
3180
3181 struct stat stbuf;
3182 int retcode = os::stat(file_name, &stbuf);
3183 if (retcode != 0) {
3184 jio_fprintf(defaultStream::error_stream(),
3185 "Could not stat options file '%s'\n",
3186 file_name);
3187 ::close(fd);
3188 return JNI_ERR;
3189 }
3190
3191 if (stbuf.st_size == 0) {
3192 // tell caller there is no option data and that is ok
3193 ::close(fd);
3194 return JNI_OK;
3195 }
3196
3197 // '+ 1' for null termination even with max bytes
3198 size_t bytes_alloc = stbuf.st_size + 1;
3199
3200 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3201 if (nullptr == buf) {
3202 jio_fprintf(defaultStream::error_stream(),
3203 "Could not allocate read buffer for options file parse\n");
3204 ::close(fd);
3205 return JNI_ENOMEM;
3206 }
3207
3208 memset(buf, 0, bytes_alloc);
3209
3210 // Fill buffer
3211 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3212 ::close(fd);
3213 if (bytes_read < 0) {
3214 FREE_C_HEAP_ARRAY(char, buf);
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Could not read options file '%s'\n", file_name);
3217 return JNI_ERR;
3218 }
3219
3220 if (bytes_read == 0) {
3221 // tell caller there is no option data and that is ok
3222 FREE_C_HEAP_ARRAY(char, buf);
3223 return JNI_OK;
3224 }
3225
3226 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3227
3228 FREE_C_HEAP_ARRAY(char, buf);
3229 return retcode;
3230 }
3231
3232 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3233 // Construct option array
3234 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3235
3236 // some pointers to help with parsing
3237 char *buffer_end = buffer + buf_len;
3238 char *opt_hd = buffer;
3239 char *wrt = buffer;
3240 char *rd = buffer;
3241
3242 // parse all options
3243 while (rd < buffer_end) {
3244 // skip leading white space from the input string
3245 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3246 rd++;
3247 }
3248
3249 if (rd >= buffer_end) {
3250 break;
3251 }
3252
3253 // Remember this is where we found the head of the token.
3254 opt_hd = wrt;
3255
3256 // Tokens are strings of non white space characters separated
3257 // by one or more white spaces.
3258 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3259 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3260 int quote = *rd; // matching quote to look for
3261 rd++; // don't copy open quote
3262 while (rd < buffer_end && *rd != quote) {
3263 // include everything (even spaces)
3264 // up until the close quote
3265 *wrt++ = *rd++; // copy to option string
3266 }
3267
3268 if (rd < buffer_end) {
3269 rd++; // don't copy close quote
3270 } else {
3271 // did not see closing quote
3272 jio_fprintf(defaultStream::error_stream(),
3273 "Unmatched quote in %s\n", name);
3274 return JNI_ERR;
3275 }
3276 } else {
3277 *wrt++ = *rd++; // copy to option string
3278 }
3279 }
3280
3281 // steal a white space character and set it to null
3282 *wrt++ = '\0';
3283 // We now have a complete token
3284
3285 JavaVMOption option;
3286 option.optionString = opt_hd;
3287 option.extraInfo = nullptr;
3288
3289 options.append(option); // Fill in option
3290
3291 rd++; // Advance to next character
3292 }
3293
3294 // Fill out JavaVMInitArgs structure.
3295 return vm_args->set_args(&options);
3296 }
3297
3298 #ifndef PRODUCT
3299 // Determine whether LogVMOutput should be implicitly turned on.
3300 static bool use_vm_log() {
3301 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3302 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3303 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3304 PrintAssembly || TraceDeoptimization ||
3305 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3306 return true;
3307 }
3308
3309 #ifdef COMPILER1
3310 if (PrintC1Statistics) {
3311 return true;
3312 }
3313 #endif // COMPILER1
3314
3315 #ifdef COMPILER2
3316 if (PrintOptoAssembly || PrintOptoStatistics) {
3317 return true;
3318 }
3319 #endif // COMPILER2
3320
3321 return false;
3322 }
3323
3324 #endif // PRODUCT
3325
3326 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3327 for (int index = 0; index < args->nOptions; index++) {
3328 const JavaVMOption* option = args->options + index;
3329 const char* tail;
3330 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3331 return true;
3332 }
3333 }
3334 return false;
3335 }
3336
3337 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3338 const char* vm_options_file,
3339 const int vm_options_file_pos,
3340 ScopedVMInitArgs* vm_options_file_args,
3341 ScopedVMInitArgs* args_out) {
3342 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3343 if (code != JNI_OK) {
3344 return code;
3345 }
3346
3347 if (vm_options_file_args->get()->nOptions < 1) {
3348 return JNI_OK;
3349 }
3350
3351 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3352 jio_fprintf(defaultStream::error_stream(),
3353 "A VM options file may not refer to a VM options file. "
3354 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3355 "options file '%s' in options container '%s' is an error.\n",
3356 vm_options_file_args->vm_options_file_arg(),
3357 vm_options_file_args->container_name());
3358 return JNI_EINVAL;
3359 }
3360
3361 return args_out->insert(args, vm_options_file_args->get(),
3362 vm_options_file_pos);
3363 }
3364
3365 // Expand -XX:VMOptionsFile found in args_in as needed.
3366 // mod_args and args_out parameters may return values as needed.
3367 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3368 ScopedVMInitArgs* mod_args,
3369 JavaVMInitArgs** args_out) {
3370 jint code = match_special_option_and_act(args_in, mod_args);
3371 if (code != JNI_OK) {
3372 return code;
3373 }
3374
3375 if (mod_args->is_set()) {
3376 // args_in contains -XX:VMOptionsFile and mod_args contains the
3377 // original options from args_in along with the options expanded
3378 // from the VMOptionsFile. Return a short-hand to the caller.
3379 *args_out = mod_args->get();
3380 } else {
3381 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3382 }
3383 return JNI_OK;
3384 }
3385
3386 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3387 ScopedVMInitArgs* args_out) {
3388 // Remaining part of option string
3389 const char* tail;
3390 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3391
3392 for (int index = 0; index < args->nOptions; index++) {
3393 const JavaVMOption* option = args->options + index;
3394 if (match_option(option, "-XX:Flags=", &tail)) {
3395 Arguments::set_jvm_flags_file(tail);
3396 continue;
3397 }
3398 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3399 if (vm_options_file_args.found_vm_options_file_arg()) {
3400 jio_fprintf(defaultStream::error_stream(),
3401 "The option '%s' is already specified in the options "
3402 "container '%s' so the specification of '%s' in the "
3403 "same options container is an error.\n",
3404 vm_options_file_args.vm_options_file_arg(),
3405 vm_options_file_args.container_name(),
3406 option->optionString);
3407 return JNI_EINVAL;
3408 }
3409 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3410 // If there's a VMOptionsFile, parse that
3411 jint code = insert_vm_options_file(args, tail, index,
3412 &vm_options_file_args, args_out);
3413 if (code != JNI_OK) {
3414 return code;
3415 }
3416 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3417 if (args_out->is_set()) {
3418 // The VMOptions file inserted some options so switch 'args'
3419 // to the new set of options, and continue processing which
3420 // preserves "last option wins" semantics.
3421 args = args_out->get();
3422 // The first option from the VMOptionsFile replaces the
3423 // current option. So we back track to process the
3424 // replacement option.
3425 index--;
3426 }
3427 continue;
3428 }
3429 if (match_option(option, "-XX:+PrintVMOptions")) {
3430 PrintVMOptions = true;
3431 continue;
3432 }
3433 if (match_option(option, "-XX:-PrintVMOptions")) {
3434 PrintVMOptions = false;
3435 continue;
3436 }
3437 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3438 IgnoreUnrecognizedVMOptions = true;
3439 continue;
3440 }
3441 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3442 IgnoreUnrecognizedVMOptions = false;
3443 continue;
3444 }
3445 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3446 JVMFlag::printFlags(tty, false);
3447 vm_exit(0);
3448 }
3449
3450 #ifndef PRODUCT
3451 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3452 JVMFlag::printFlags(tty, true);
3453 vm_exit(0);
3454 }
3455 #endif
3456 }
3457 return JNI_OK;
3458 }
3459
3460 static void print_options(const JavaVMInitArgs *args) {
3461 const char* tail;
3462 for (int index = 0; index < args->nOptions; index++) {
3463 const JavaVMOption *option = args->options + index;
3464 if (match_option(option, "-XX:", &tail)) {
3465 logOption(tail);
3466 }
3467 }
3468 }
3469
3470 bool Arguments::handle_deprecated_print_gc_flags() {
3471 if (PrintGC) {
3472 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3473 }
3474 if (PrintGCDetails) {
3475 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3476 }
3477
3478 if (_legacyGCLogging.lastFlag == 2) {
3479 // -Xloggc was used to specify a filename
3480 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3481
3482 LogTarget(Error, logging) target;
3483 LogStream errstream(target);
3484 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3485 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3486 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3487 }
3488 return true;
3489 }
3490
3491 static void apply_debugger_ergo() {
3492 #ifdef ASSERT
3493 if (ReplayCompiles) {
3494 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3495 }
3496
3497 if (UseDebuggerErgo) {
3498 // Turn on sub-flags
3499 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3500 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3501 }
3502
3503 if (UseDebuggerErgo2) {
3504 // Debugging with limited number of CPUs
3505 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3506 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3507 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3508 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3509 }
3510 #endif // ASSERT
3511 }
3512
3513 // Parse entry point called from JNI_CreateJavaVM
3514
3515 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3516 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3517 JVMFlag::check_all_flag_declarations();
3518
3519 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3520 const char* hotspotrc = ".hotspotrc";
3521 bool settings_file_specified = false;
3522 bool needs_hotspotrc_warning = false;
3523 ScopedVMInitArgs initial_vm_options_args("");
3524 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3525 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3526
3527 // Pointers to current working set of containers
3528 JavaVMInitArgs* cur_cmd_args;
3529 JavaVMInitArgs* cur_vm_options_args;
3530 JavaVMInitArgs* cur_java_options_args;
3531 JavaVMInitArgs* cur_java_tool_options_args;
3532
3533 // Containers for modified/expanded options
3534 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3535 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3536 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3537 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3538
3539
3540 jint code =
3541 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3542 if (code != JNI_OK) {
3543 return code;
3544 }
3545
3546 code = parse_java_options_environment_variable(&initial_java_options_args);
3547 if (code != JNI_OK) {
3548 return code;
3549 }
3550
3551 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3552 char *vmoptions = ClassLoader::lookup_vm_options();
3553 if (vmoptions != nullptr) {
3554 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3555 FREE_C_HEAP_ARRAY(char, vmoptions);
3556 if (code != JNI_OK) {
3557 return code;
3558 }
3559 }
3560
3561 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3562 &mod_java_tool_options_args,
3563 &cur_java_tool_options_args);
3564 if (code != JNI_OK) {
3565 return code;
3566 }
3567
3568 code = expand_vm_options_as_needed(initial_cmd_args,
3569 &mod_cmd_args,
3570 &cur_cmd_args);
3571 if (code != JNI_OK) {
3572 return code;
3573 }
3574
3575 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3576 &mod_java_options_args,
3577 &cur_java_options_args);
3578 if (code != JNI_OK) {
3579 return code;
3580 }
3581
3582 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3583 &mod_vm_options_args,
3584 &cur_vm_options_args);
3585 if (code != JNI_OK) {
3586 return code;
3587 }
3588
3589 const char* flags_file = Arguments::get_jvm_flags_file();
3590 settings_file_specified = (flags_file != nullptr);
3591
3592 if (IgnoreUnrecognizedVMOptions) {
3593 cur_cmd_args->ignoreUnrecognized = true;
3594 cur_java_tool_options_args->ignoreUnrecognized = true;
3595 cur_java_options_args->ignoreUnrecognized = true;
3596 }
3597
3598 // Parse specified settings file
3599 if (settings_file_specified) {
3600 if (!process_settings_file(flags_file, true,
3601 cur_cmd_args->ignoreUnrecognized)) {
3602 return JNI_EINVAL;
3603 }
3604 } else {
3605 #ifdef ASSERT
3606 // Parse default .hotspotrc settings file
3607 if (!process_settings_file(".hotspotrc", false,
3608 cur_cmd_args->ignoreUnrecognized)) {
3609 return JNI_EINVAL;
3610 }
3611 #else
3612 struct stat buf;
3613 if (os::stat(hotspotrc, &buf) == 0) {
3614 needs_hotspotrc_warning = true;
3615 }
3616 #endif
3617 }
3618
3619 if (PrintVMOptions) {
3620 print_options(cur_java_tool_options_args);
3621 print_options(cur_cmd_args);
3622 print_options(cur_java_options_args);
3623 }
3624
3625 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3626 jint result = parse_vm_init_args(cur_vm_options_args,
3627 cur_java_tool_options_args,
3628 cur_java_options_args,
3629 cur_cmd_args);
3630
3631 if (result != JNI_OK) {
3632 return result;
3633 }
3634
3635 // Delay warning until here so that we've had a chance to process
3636 // the -XX:-PrintWarnings flag
3637 if (needs_hotspotrc_warning) {
3638 warning("%s file is present but has been ignored. "
3639 "Run with -XX:Flags=%s to load the file.",
3640 hotspotrc, hotspotrc);
3641 }
3642
3643 if (needs_module_property_warning) {
3644 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3645 " names that are reserved for internal use.");
3646 }
3647
3648 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3649 UNSUPPORTED_OPTION(UseLargePages);
3650 #endif
3651
3652 #if defined(AIX)
3653 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3654 #endif
3655
3656 #ifndef PRODUCT
3657 if (TraceBytecodesAt != 0) {
3658 TraceBytecodes = true;
3659 }
3660 #endif // PRODUCT
3661
3662 if (ScavengeRootsInCode == 0) {
3663 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3664 warning("Forcing ScavengeRootsInCode non-zero");
3665 }
3666 ScavengeRootsInCode = 1;
3667 }
3668
3669 if (!handle_deprecated_print_gc_flags()) {
3670 return JNI_EINVAL;
3671 }
3672
3673 // Set object alignment values.
3674 set_object_alignment();
3675
3676 #if !INCLUDE_CDS
3677 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3678 jio_fprintf(defaultStream::error_stream(),
3679 "Shared spaces are not supported in this VM\n");
3680 return JNI_ERR;
3681 }
3682 if (DumpLoadedClassList != nullptr) {
3683 jio_fprintf(defaultStream::error_stream(),
3684 "DumpLoadedClassList is not supported in this VM\n");
3685 return JNI_ERR;
3686 }
3687 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3688 log_is_enabled(Info, cds)) {
3689 warning("Shared spaces are not supported in this VM");
3690 UseSharedSpaces = false;
3691 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3692 }
3693 no_shared_spaces("CDS Disabled");
3694 #endif // INCLUDE_CDS
3695
3696 // Verify NMT arguments
3697 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3698 if (lvl == NMT_unknown) {
3699 jio_fprintf(defaultStream::error_stream(),
3700 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3701 return JNI_ERR;
3702 }
3703 if (PrintNMTStatistics && lvl == NMT_off) {
3704 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3705 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3706 }
3707
3708 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3709 if (trace_dependencies && VerifyDependencies) {
3710 warning("dependency logging results may be inflated by VerifyDependencies");
3711 }
3712
3713 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3714 log_is_enabled(Info, class, load, cause);
3715 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3716 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3717 }
3718
3719 apply_debugger_ergo();
3720
3721 // The VMThread needs to stop now and then to execute these debug options.
3722 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3723 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3724 }
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 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3767 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3768 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3769 warning("UseSecondarySupersTable is not supported");
3770 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3771 }
3772 if (!UseSecondarySupersTable) {
3773 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3774 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3775 }
3776
3777 #ifdef ZERO
3778 // Clear flags not supported on zero.
3779 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3780 #endif // ZERO
3781
3782 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3783 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3784 DebugNonSafepoints = true;
3785 }
3786
3787 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3788 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3789 }
3790
3791 // Treat the odd case where local verification is enabled but remote
3792 // verification is not as if both were enabled.
3793 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3794 log_info(verification)("Turning on remote verification because local verification is on");
3795 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3796 }
3797 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3798 // Disable calling convention optimizations if inline types are not supported.
3799 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3800 // the CDS archive, as the values must match between dumptime and runtime.
3801 InlineTypePassFieldsAsArgs = false;
3802 InlineTypeReturnedAsFields = false;
3803 }
3804
3805 #ifndef PRODUCT
3806 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3807 if (use_vm_log()) {
3808 LogVMOutput = true;
3809 }
3810 }
3811 #endif // PRODUCT
3812
3813 if (PrintCommandLineFlags) {
3814 JVMFlag::printSetFlags(tty);
3815 }
3816
3817 #if COMPILER2_OR_JVMCI
3818 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3819 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3820 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3821 }
3822 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3823
3824 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3825 if (!EnableVectorReboxing) {
3826 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3827 } else {
3828 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3829 }
3830 }
3831 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3832
3833 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3834 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3835 }
3836 FLAG_SET_DEFAULT(UseVectorStubs, false);
3837 }
3838 #endif // COMPILER2_OR_JVMCI
3839
3840 if (log_is_enabled(Info, perf, class, link)) {
3841 if (!UsePerfData) {
3842 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3843 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3844 }
3845 }
3846
3847 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3848 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3849 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3850 }
3851 }
3852 return JNI_OK;
3853 }
3854
3855 jint Arguments::adjust_after_os() {
3856 if (UseNUMA) {
3857 if (UseParallelGC) {
3858 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3859 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3860 }
3861 }
3862 }
3863 return JNI_OK;
3864 }
3865
3866 int Arguments::PropertyList_count(SystemProperty* pl) {
3867 int count = 0;
3868 while(pl != nullptr) {
3869 count++;
3870 pl = pl->next();
3871 }
3872 return count;
3873 }
3874
3875 // Return the number of readable properties.
3876 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3877 int count = 0;
3878 while(pl != nullptr) {
3879 if (pl->readable()) {
3880 count++;
3881 }
3882 pl = pl->next();
3883 }
3884 return count;
3885 }
3886
3887 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3888 assert(key != nullptr, "just checking");
3889 SystemProperty* prop;
3890 for (prop = pl; prop != nullptr; prop = prop->next()) {
3891 if (strcmp(key, prop->key()) == 0) return prop->value();
3892 }
3893 return nullptr;
3894 }
3895
3896 // Return the value of the requested property provided that it is a readable property.
3897 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3898 assert(key != nullptr, "just checking");
3899 SystemProperty* prop;
3900 // Return the property value if the keys match and the property is not internal or
3901 // it's the special internal property "jdk.boot.class.path.append".
3902 for (prop = pl; prop != nullptr; prop = prop->next()) {
3903 if (strcmp(key, prop->key()) == 0) {
3904 if (!prop->internal()) {
3905 return prop->value();
3906 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3907 return prop->value();
3908 } else {
3909 // Property is internal and not jdk.boot.class.path.append so return null.
3910 return nullptr;
3911 }
3912 }
3913 }
3914 return nullptr;
3915 }
3916
3917 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3918 SystemProperty* p = *plist;
3919 if (p == nullptr) {
3920 *plist = new_p;
3921 } else {
3922 while (p->next() != nullptr) {
3923 p = p->next();
3924 }
3925 p->set_next(new_p);
3926 }
3927 }
3928
3929 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3930 bool writeable, bool internal) {
3931 if (plist == nullptr)
3932 return;
3933
3934 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3935 PropertyList_add(plist, new_p);
3936 }
3937
3938 void Arguments::PropertyList_add(SystemProperty *element) {
3939 PropertyList_add(&_system_properties, element);
3940 }
3941
3942 // This add maintains unique property key in the list.
3943 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3944 PropertyAppendable append, PropertyWriteable writeable,
3945 PropertyInternal internal) {
3946 if (plist == nullptr)
3947 return;
3948
3949 // If property key exists and is writeable, then update with new value.
3950 // Trying to update a non-writeable property is silently ignored.
3951 SystemProperty* prop;
3952 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3953 if (strcmp(k, prop->key()) == 0) {
3954 if (append == AppendProperty) {
3955 prop->append_writeable_value(v);
3956 } else {
3957 prop->set_writeable_value(v);
3958 }
3959 return;
3960 }
3961 }
3962
3963 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3964 }
3965
3966 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3967 // Returns true if all of the source pointed by src has been copied over to
3968 // the destination buffer pointed by buf. Otherwise, returns false.
3969 // Notes:
3970 // 1. If the length (buflen) of the destination buffer excluding the
3971 // null terminator character is not long enough for holding the expanded
3972 // pid characters, it also returns false instead of returning the partially
3973 // expanded one.
3974 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3975 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3976 char* buf, size_t buflen) {
3977 const char* p = src;
3978 char* b = buf;
3979 const char* src_end = &src[srclen];
3980 char* buf_end = &buf[buflen - 1];
3981
3982 while (p < src_end && b < buf_end) {
3983 if (*p == '%') {
3984 switch (*(++p)) {
3985 case '%': // "%%" ==> "%"
3986 *b++ = *p++;
3987 break;
3988 case 'p': { // "%p" ==> current process id
3989 // buf_end points to the character before the last character so
3990 // that we could write '\0' to the end of the buffer.
3991 size_t buf_sz = buf_end - b + 1;
3992 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3993
3994 // if jio_snprintf fails or the buffer is not long enough to hold
3995 // the expanded pid, returns false.
3996 if (ret < 0 || ret >= (int)buf_sz) {
3997 return false;
3998 } else {
3999 b += ret;
4000 assert(*b == '\0', "fail in copy_expand_pid");
4001 if (p == src_end && b == buf_end + 1) {
4002 // reach the end of the buffer.
4003 return true;
4004 }
4005 }
4006 p++;
4007 break;
4008 }
4009 default :
4010 *b++ = '%';
4011 }
4012 } else {
4013 *b++ = *p++;
4014 }
4015 }
4016 *b = '\0';
4017 return (p == src_end); // return false if not all of the source was copied
4018 }