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 char* Arguments::_java_command = nullptr;
90 SystemProperty* Arguments::_system_properties = nullptr;
91 size_t Arguments::_conservative_max_heap_alignment = 0;
92 Arguments::Mode Arguments::_mode = _mixed;
93 const char* Arguments::_java_vendor_url_bug = nullptr;
94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
95 bool Arguments::_sun_java_launcher_is_altjvm = false;
96
97 // These parameters are reset in method parse_vm_init_args()
98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
100 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
101 bool Arguments::_ClipInlining = ClipInlining;
102 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
103
104 bool Arguments::_enable_preview = false;
105
106 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
107
108 // These are not set by the JDK's built-in launchers, but they can be set by
109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
110 // JavaVMOption in jni.h.
111 abort_hook_t Arguments::_abort_hook = nullptr;
112 exit_hook_t Arguments::_exit_hook = nullptr;
113 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
117 SystemProperty *Arguments::_java_library_path = nullptr;
118 SystemProperty *Arguments::_java_home = nullptr;
119 SystemProperty *Arguments::_java_class_path = nullptr;
120 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
121 SystemProperty *Arguments::_vm_info = nullptr;
122
123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
124 PathString *Arguments::_boot_class_path = nullptr;
125 bool Arguments::_has_jimage = false;
126
127 char* Arguments::_ext_dirs = nullptr;
128
129 // True if -Xshare:auto option was specified.
130 static bool xshare_auto_cmd_line = false;
131
132 // True if -Xint/-Xmixed/-Xcomp were specified
133 static bool mode_flag_cmd_line = false;
134
135 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
136 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
137 if (new_value == nullptr) {
138 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
139 return false;
140 }
141 if (_value != nullptr) {
142 FreeHeap(_value);
143 }
144 _value = new_value;
145 strcpy(_value, value);
146 return true;
147 }
148
149 void PathString::append_value(const char *value) {
150 char *sp;
151 size_t len = 0;
152 if (value != nullptr) {
153 len = strlen(value);
154 if (_value != nullptr) {
155 len += strlen(_value);
156 }
157 sp = AllocateHeap(len+2, mtArguments);
158 assert(sp != nullptr, "Unable to allocate space for new append path value");
159 if (sp != nullptr) {
160 if (_value != nullptr) {
161 strcpy(sp, _value);
162 strcat(sp, os::path_separator());
163 strcat(sp, value);
164 FreeHeap(_value);
165 } else {
166 strcpy(sp, value);
167 }
168 _value = sp;
169 }
170 }
171 }
172
173 PathString::PathString(const char* value) {
174 if (value == nullptr) {
175 _value = nullptr;
176 } else {
177 _value = AllocateHeap(strlen(value)+1, mtArguments);
178 strcpy(_value, value);
179 }
180 }
181
182 PathString::~PathString() {
183 if (_value != nullptr) {
184 FreeHeap(_value);
185 _value = nullptr;
186 }
187 }
188
189 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
190 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
191 size_t len = strlen(module_name) + 1;
192 _module_name = AllocateHeap(len, mtInternal);
193 strncpy(_module_name, module_name, len); // copy the trailing null
194 _path = new PathString(path);
195 }
196
197 ModulePatchPath::~ModulePatchPath() {
198 if (_module_name != nullptr) {
199 FreeHeap(_module_name);
200 _module_name = nullptr;
201 }
202 if (_path != nullptr) {
203 delete _path;
204 _path = nullptr;
205 }
206 }
207
208 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
209 if (key == nullptr) {
210 _key = nullptr;
211 } else {
212 _key = AllocateHeap(strlen(key)+1, mtArguments);
213 strcpy(_key, key);
214 }
215 _next = nullptr;
216 _internal = internal;
217 _writeable = writeable;
218 }
219
220 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
221 // part of the option string.
222 static bool match_option(const JavaVMOption *option, const char* name,
223 const char** tail) {
224 size_t len = strlen(name);
225 if (strncmp(option->optionString, name, len) == 0) {
226 *tail = option->optionString + len;
227 return true;
228 } else {
229 return false;
230 }
231 }
232
233 // Check if 'option' matches 'name'. No "tail" is allowed.
234 static bool match_option(const JavaVMOption *option, const char* name) {
235 const char* tail = nullptr;
236 bool result = match_option(option, name, &tail);
237 if (tail != nullptr && *tail == '\0') {
238 return result;
239 } else {
240 return false;
241 }
242 }
243
244 // Return true if any of the strings in null-terminated array 'names' matches.
245 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
246 // the option must match exactly.
247 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
248 bool tail_allowed) {
249 for (/* empty */; *names != nullptr; ++names) {
250 if (match_option(option, *names, tail)) {
251 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
252 return true;
253 }
254 }
255 }
256 return false;
257 }
258
259 #if INCLUDE_JFR
260 static bool _has_jfr_option = false; // is using JFR
261
262 // return true on failure
263 static bool match_jfr_option(const JavaVMOption** option) {
264 assert((*option)->optionString != nullptr, "invariant");
265 char* tail = nullptr;
266 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
267 _has_jfr_option = true;
268 return Jfr::on_start_flight_recording_option(option, tail);
269 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
270 _has_jfr_option = true;
271 return Jfr::on_flight_recorder_option(option, tail);
272 }
273 return false;
274 }
275
276 bool Arguments::has_jfr_option() {
277 return _has_jfr_option;
278 }
279 #endif
280
281 static void logOption(const char* opt) {
282 if (PrintVMOptions) {
283 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
284 }
285 }
286
287 bool needs_module_property_warning = false;
288
289 #define MODULE_PROPERTY_PREFIX "jdk.module."
290 #define MODULE_PROPERTY_PREFIX_LEN 11
291 #define ADDEXPORTS "addexports"
292 #define ADDEXPORTS_LEN 10
293 #define ADDREADS "addreads"
294 #define ADDREADS_LEN 8
295 #define ADDOPENS "addopens"
296 #define ADDOPENS_LEN 8
297 #define PATCH "patch"
298 #define PATCH_LEN 5
299 #define ADDMODS "addmods"
300 #define ADDMODS_LEN 7
301 #define LIMITMODS "limitmods"
302 #define LIMITMODS_LEN 9
303 #define PATH "path"
304 #define PATH_LEN 4
305 #define UPGRADE_PATH "upgrade.path"
306 #define UPGRADE_PATH_LEN 12
307 #define ENABLE_NATIVE_ACCESS "enable.native.access"
308 #define ENABLE_NATIVE_ACCESS_LEN 20
309 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
310 #define ILLEGAL_NATIVE_ACCESS_LEN 21
311
312 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
313 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
314 return ((strncmp(option, property, len) == 0) &&
315 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
316 }
317
318 // Return true if property starts with "jdk.module." and its ensuing chars match
319 // any of the reserved module properties.
320 // property should be passed without the leading "-D".
321 bool Arguments::is_internal_module_property(const char* property) {
322 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
323 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
324 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
325 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
326 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
327 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
328 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
329 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
330 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
331 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
332 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
333 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
334 return true;
335 }
336 }
337 return false;
338 }
339
340 // Return true if the key matches the --module-path property name ("jdk.module.path").
341 bool Arguments::is_module_path_property(const char* key) {
342 return (strcmp(key, MODULE_PROPERTY_PREFIX PATH) == 0);
343 }
344
345 // Process java launcher properties.
346 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
347 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
348 // Must do this before setting up other system properties,
349 // as some of them may depend on launcher type.
350 for (int index = 0; index < args->nOptions; index++) {
351 const JavaVMOption* option = args->options + index;
352 const char* tail;
353
354 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
355 process_java_launcher_argument(tail, option->extraInfo);
356 continue;
357 }
358 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
359 if (strcmp(tail, "true") == 0) {
360 _sun_java_launcher_is_altjvm = true;
361 }
362 continue;
363 }
364 }
365 }
366
367 // Initialize system properties key and value.
368 void Arguments::init_system_properties() {
369
370 // Set up _boot_class_path which is not a property but
371 // relies heavily on argument processing and the jdk.boot.class.path.append
372 // property. It is used to store the underlying boot class path.
373 _boot_class_path = new PathString(nullptr);
374
375 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
376 "Java Virtual Machine Specification", false));
377 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
378 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
379 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
380
381 // Initialize the vm.info now, but it will need updating after argument parsing.
382 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
383
384 // Following are JVMTI agent writable properties.
385 // Properties values are set to nullptr and they are
386 // os specific they are initialized in os::init_system_properties_values().
387 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
388 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
389 _java_home = new SystemProperty("java.home", nullptr, true);
390 _java_class_path = new SystemProperty("java.class.path", "", true);
391 // jdk.boot.class.path.append is a non-writeable, internal property.
392 // It can only be set by either:
393 // - -Xbootclasspath/a:
394 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
395 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
396
397 // Add to System Property list.
398 PropertyList_add(&_system_properties, _sun_boot_library_path);
399 PropertyList_add(&_system_properties, _java_library_path);
400 PropertyList_add(&_system_properties, _java_home);
401 PropertyList_add(&_system_properties, _java_class_path);
402 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
403 PropertyList_add(&_system_properties, _vm_info);
404
405 // Set OS specific system properties values
406 os::init_system_properties_values();
407 }
408
409 // Update/Initialize System properties after JDK version number is known
410 void Arguments::init_version_specific_system_properties() {
411 enum { bufsz = 16 };
412 char buffer[bufsz];
413 const char* spec_vendor = "Oracle Corporation";
414 uint32_t spec_version = JDK_Version::current().major_version();
415
416 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
417
418 PropertyList_add(&_system_properties,
419 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
420 PropertyList_add(&_system_properties,
421 new SystemProperty("java.vm.specification.version", buffer, false));
422 PropertyList_add(&_system_properties,
423 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
424 }
425
426 /*
427 * -XX argument processing:
428 *
429 * -XX arguments are defined in several places, such as:
430 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
431 * -XX arguments are parsed in parse_argument().
432 * -XX argument bounds checking is done in check_vm_args_consistency().
433 *
434 * Over time -XX arguments may change. There are mechanisms to handle common cases:
435 *
436 * ALIASED: An option that is simply another name for another option. This is often
437 * part of the process of deprecating a flag, but not all aliases need
438 * to be deprecated.
439 *
440 * Create an alias for an option by adding the old and new option names to the
441 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
442 *
443 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
444 * support may be removed in the future. Both regular and aliased options may be
445 * deprecated.
446 *
447 * Add a deprecation warning for an option (or alias) by adding an entry in the
448 * "special_jvm_flags" table and setting the "deprecated_in" field.
449 * Often an option "deprecated" in one major release will
450 * be made "obsolete" in the next. In this case the entry should also have its
451 * "obsolete_in" field set.
452 *
453 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
454 * on the command line. A warning is printed to let the user know that option might not
455 * be accepted in the future.
456 *
457 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
458 * table and setting the "obsolete_in" field.
459 *
460 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
461 * to the current JDK version. The system will flatly refuse to admit the existence of
462 * the flag. This allows a flag to die automatically over JDK releases.
463 *
464 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
465 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
466 * - Newly obsolete or expired deprecated options should have their global variable
467 * definitions removed (from globals.hpp, etc) and related implementations removed.
468 *
469 * Recommended approach for removing options:
470 *
471 * To remove options commonly used by customers (e.g. product -XX options), use
472 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
473 *
474 * To remove internal options (e.g. diagnostic, experimental, develop options), use
475 * a 2-step model adding major release numbers to the obsolete and expire columns.
476 *
477 * To change the name of an option, use the alias table as well as a 2-step
478 * model adding major release numbers to the deprecate and expire columns.
479 * Think twice about aliasing commonly used customer options.
480 *
481 * There are times when it is appropriate to leave a future release number as undefined.
482 *
483 * Tests: Aliases should be tested in VMAliasOptions.java.
484 * Deprecated options should be tested in VMDeprecatedOptions.java.
485 */
486
487 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
488 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
489 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
490 // the command-line as usual, but will issue a warning.
491 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
492 // the command-line, while issuing a warning and ignoring the flag value.
493 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
494 // existence of the flag.
495 //
496 // MANUAL CLEANUP ON JDK VERSION UPDATES:
497 // This table ensures that the handling of options will update automatically when the JDK
498 // version is incremented, but the source code needs to be cleanup up manually:
499 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
500 // variable should be removed, as well as users of the variable.
501 // - As "deprecated" options age into "obsolete" options, move the entry into the
502 // "Obsolete Flags" section of the table.
503 // - All expired options should be removed from the table.
504 static SpecialFlag const special_jvm_flags[] = {
505 // -------------- Deprecated Flags --------------
506 // --- Non-alias flags - sorted by obsolete_in then expired_in:
507 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
508 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
509 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
511 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
512 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
513 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
514 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
515 #ifdef LINUX
516 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
517 #endif
518 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
519 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
520 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
521
522 // -------------- Obsolete Flags - sorted by expired_in --------------
523
524 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
525
526 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
527 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
528 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
529 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
530 #if defined(X86)
531 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
532 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
533 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
534 #endif // X86
535
536
537 { "BaseFootPrintEstimate", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
538 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
539 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
540 #ifdef ASSERT
541 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
542 #endif
543
544 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
545 // These entries will generate build errors. Their purpose is to test the macros.
546 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
547 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
548 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
549 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
550 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
552 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553 #endif
554
555 { nullptr, JDK_Version(0), JDK_Version(0) }
556 };
557
558 // Flags that are aliases for other flags.
559 typedef struct {
560 const char* alias_name;
561 const char* real_name;
562 } AliasedFlag;
563
564 static AliasedFlag const aliased_jvm_flags[] = {
565 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
566 { nullptr, nullptr}
567 };
568
569 // Return true if "v" is less than "other", where "other" may be "undefined".
570 static bool version_less_than(JDK_Version v, JDK_Version other) {
571 assert(!v.is_undefined(), "must be defined");
572 if (!other.is_undefined() && v.compare(other) >= 0) {
573 return false;
574 } else {
575 return true;
576 }
577 }
578
579 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
580 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
581 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
582 flag = special_jvm_flags[i];
583 return true;
584 }
585 }
586 return false;
587 }
588
589 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
590 assert(version != nullptr, "Must provide a version buffer");
591 SpecialFlag flag;
592 if (lookup_special_flag(flag_name, flag)) {
593 if (!flag.obsolete_in.is_undefined()) {
594 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
595 *version = flag.obsolete_in;
596 // This flag may have been marked for obsoletion in this version, but we may not
597 // have actually removed it yet. Rather than ignoring it as soon as we reach
598 // this version we allow some time for the removal to happen. So if the flag
599 // still actually exists we process it as normal, but issue an adjusted warning.
600 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
601 if (real_flag != nullptr) {
602 char version_str[256];
603 version->to_string(version_str, sizeof(version_str));
604 warning("Temporarily processing option %s; support is scheduled for removal in %s",
605 flag_name, version_str);
606 return false;
607 }
608 return true;
609 }
610 }
611 }
612 return false;
613 }
614
615 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
616 assert(version != nullptr, "Must provide a version buffer");
617 SpecialFlag flag;
618 if (lookup_special_flag(flag_name, flag)) {
619 if (!flag.deprecated_in.is_undefined()) {
620 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
621 version_less_than(JDK_Version::current(), flag.expired_in)) {
622 *version = flag.deprecated_in;
623 return 1;
624 } else {
625 return -1;
626 }
627 }
628 }
629 return 0;
630 }
631
632 const char* Arguments::real_flag_name(const char *flag_name) {
633 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
634 const AliasedFlag& flag_status = aliased_jvm_flags[i];
635 if (strcmp(flag_status.alias_name, flag_name) == 0) {
636 return flag_status.real_name;
637 }
638 }
639 return flag_name;
640 }
641
642 #ifdef ASSERT
643 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
644 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
645 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
646 return true;
647 }
648 }
649 return false;
650 }
651
652 // Verifies the correctness of the entries in the special_jvm_flags table.
653 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
654 // version being earlier than the deprecation version, then a warning is issued
655 // and verification fails - by returning false. If it is detected that the table
656 // is out of date, with respect to the current version, then ideally a warning is
657 // issued but verification does not fail. This allows the VM to operate when the
658 // version is first updated, without needing to update all the impacted flags at
659 // the same time. In practice we can't issue the warning immediately when the version
660 // is updated as it occurs for every test and some tests are not prepared to handle
661 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
662 // if the check_globals flag is true, and in addition allow a grace period and only
663 // check for stale flags when we hit build 25 (which is far enough into the 6 month
664 // release cycle that all flag updates should have been processed, whilst still
665 // leaving time to make the change before RDP2).
666 // We use a gtest to call this, passing true, so that we can detect stale flags before
667 // the end of the release cycle.
668
669 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
670
671 bool Arguments::verify_special_jvm_flags(bool check_globals) {
672 bool success = true;
673 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
674 const SpecialFlag& flag = special_jvm_flags[i];
675 if (lookup_special_flag(flag.name, i)) {
676 warning("Duplicate special flag declaration \"%s\"", flag.name);
677 success = false;
678 }
679 if (flag.deprecated_in.is_undefined() &&
680 flag.obsolete_in.is_undefined()) {
681 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
682 success = false;
683 }
684
685 if (!flag.deprecated_in.is_undefined()) {
686 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
687 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
688 success = false;
689 }
690
691 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
692 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
693 success = false;
694 }
695 }
696
697 if (!flag.obsolete_in.is_undefined()) {
698 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
699 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
700 success = false;
701 }
702
703 // if flag has become obsolete it should not have a "globals" flag defined anymore.
704 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
705 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
706 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
707 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
708 success = false;
709 }
710 }
711
712 } else if (!flag.expired_in.is_undefined()) {
713 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
714 success = false;
715 }
716
717 if (!flag.expired_in.is_undefined()) {
718 // if flag has become expired it should not have a "globals" flag defined anymore.
719 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
720 !version_less_than(JDK_Version::current(), flag.expired_in)) {
721 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
722 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
723 success = false;
724 }
725 }
726 }
727 }
728 return success;
729 }
730 #endif
731
732 bool Arguments::atojulong(const char *s, julong* result) {
733 return parse_integer(s, result);
734 }
735
736 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
737 if (size < min_size) return arg_too_small;
738 if (size > max_size) return arg_too_big;
739 return arg_in_range;
740 }
741
742 // Describe an argument out of range error
743 void Arguments::describe_range_error(ArgsRange errcode) {
744 switch(errcode) {
745 case arg_too_big:
746 jio_fprintf(defaultStream::error_stream(),
747 "The specified size exceeds the maximum "
748 "representable size.\n");
749 break;
750 case arg_too_small:
751 case arg_unreadable:
752 case arg_in_range:
753 // do nothing for now
754 break;
755 default:
756 ShouldNotReachHere();
757 }
758 }
759
760 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
761 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
762 return true;
763 } else {
764 return false;
765 }
766 }
767
768 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
769 // strtod allows leading whitespace, but our flag format does not.
770 if (*value == '\0' || isspace((unsigned char) *value)) {
771 return false;
772 }
773 char* end;
774 errno = 0;
775 double v = strtod(value, &end);
776 if ((errno != 0) || (*end != 0)) {
777 return false;
778 }
779 if (g_isnan(v) || !g_isfinite(v)) {
780 // Currently we cannot handle these special values.
781 return false;
782 }
783
784 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
785 return true;
786 }
787 return false;
788 }
789
790 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
791 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
792
793 if (flag->is_int()) {
794 int v;
795 if (parse_integer(value, &v)) {
796 result = JVMFlagAccess::set_int(flag, &v, origin);
797 }
798 } else if (flag->is_uint()) {
799 uint v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_uint(flag, &v, origin);
802 }
803 } else if (flag->is_intx()) {
804 intx v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_intx(flag, &v, origin);
807 }
808 } else if (flag->is_uintx()) {
809 uintx v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_uintx(flag, &v, origin);
812 }
813 } else if (flag->is_uint64_t()) {
814 uint64_t v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
817 }
818 } else if (flag->is_size_t()) {
819 size_t v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_size_t(flag, &v, origin);
822 }
823 }
824
825 return result == JVMFlag::SUCCESS;
826 }
827
828 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
829 if (value[0] == '\0') {
830 value = nullptr;
831 }
832 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
833 // Contract: JVMFlag always returns a pointer that needs freeing.
834 FREE_C_HEAP_ARRAY(char, value);
835 return true;
836 }
837
838 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
839 const char* old_value = "";
840 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
841 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
842 size_t new_len = strlen(new_value);
843 const char* value;
844 char* free_this_too = nullptr;
845 if (old_len == 0) {
846 value = new_value;
847 } else if (new_len == 0) {
848 value = old_value;
849 } else {
850 size_t length = old_len + 1 + new_len + 1;
851 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
852 // each new setting adds another LINE to the switch:
853 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
854 value = buf;
855 free_this_too = buf;
856 }
857 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
858 // JVMFlag always returns a pointer that needs freeing.
859 FREE_C_HEAP_ARRAY(char, value);
860 // JVMFlag made its own copy, so I must delete my own temp. buffer.
861 FREE_C_HEAP_ARRAY(char, free_this_too);
862 return true;
863 }
864
865 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
866 const char* real_name = real_flag_name(arg);
867 JDK_Version since = JDK_Version();
868 switch (is_deprecated_flag(arg, &since)) {
869 case -1: {
870 // Obsolete or expired, so don't process normally,
871 // but allow for an obsolete flag we're still
872 // temporarily allowing.
873 if (!is_obsolete_flag(arg, &since)) {
874 return real_name;
875 }
876 // Note if we're not considered obsolete then we can't be expired either
877 // as obsoletion must come first.
878 return nullptr;
879 }
880 case 0:
881 return real_name;
882 case 1: {
883 char version[256];
884 since.to_string(version, sizeof(version));
885 if (real_name != arg) {
886 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
887 arg, version, real_name);
888 } else {
889 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
890 arg, version);
891 }
892 return real_name;
893 }
894 }
895 ShouldNotReachHere();
896 return nullptr;
897 }
898
899 #define BUFLEN 255
900
901 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
902 char name_copied[BUFLEN+1];
903 if (name[name_length] != 0) {
904 if (name_length > BUFLEN) {
905 return nullptr;
906 } else {
907 strncpy(name_copied, name, name_length);
908 name_copied[name_length] = '\0';
909 name = name_copied;
910 }
911 }
912
913 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
914 if (real_name == nullptr) {
915 return nullptr;
916 }
917 JVMFlag* flag = JVMFlag::find_flag(real_name);
918 return flag;
919 }
920
921 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
922 bool is_bool = false;
923 bool bool_val = false;
924 char c = *arg;
925 if (c == '+' || c == '-') {
926 is_bool = true;
927 bool_val = (c == '+');
928 arg++;
929 }
930
931 const char* name = arg;
932 while (true) {
933 c = *arg;
934 if (isalnum(c) || (c == '_')) {
935 ++arg;
936 } else {
937 break;
938 }
939 }
940
941 size_t name_len = size_t(arg - name);
942 if (name_len == 0) {
943 return false;
944 }
945
946 JVMFlag* flag = find_jvm_flag(name, name_len);
947 if (flag == nullptr) {
948 return false;
949 }
950
951 if (is_bool) {
952 if (*arg != 0) {
953 // Error -- extra characters such as -XX:+BoolFlag=123
954 return false;
955 }
956 return set_bool_flag(flag, bool_val, origin);
957 }
958
959 if (arg[0] == '=') {
960 const char* value = arg + 1;
961 if (flag->is_ccstr()) {
962 if (flag->ccstr_accumulates()) {
963 return append_to_string_flag(flag, value, origin);
964 } else {
965 return set_string_flag(flag, value, origin);
966 }
967 } else if (flag->is_double()) {
968 return set_fp_numeric_flag(flag, value, origin);
969 } else {
970 return set_numeric_flag(flag, value, origin);
971 }
972 }
973
974 if (arg[0] == ':' && arg[1] == '=') {
975 // -XX:Foo:=xxx will reset the string flag to the given value.
976 const char* value = arg + 2;
977 return set_string_flag(flag, value, origin);
978 }
979
980 return false;
981 }
982
983 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
984 assert(bldarray != nullptr, "illegal argument");
985
986 if (arg == nullptr) {
987 return;
988 }
989
990 int new_count = *count + 1;
991
992 // expand the array and add arg to the last element
993 if (*bldarray == nullptr) {
994 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
995 } else {
996 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
997 }
998 (*bldarray)[*count] = os::strdup_check_oom(arg);
999 *count = new_count;
1000 }
1001
1002 void Arguments::build_jvm_args(const char* arg) {
1003 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1004 }
1005
1006 void Arguments::build_jvm_flags(const char* arg) {
1007 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1008 }
1009
1010 // utility function to return a string that concatenates all
1011 // strings in a given char** array
1012 const char* Arguments::build_resource_string(char** args, int count) {
1013 if (args == nullptr || count == 0) {
1014 return nullptr;
1015 }
1016 size_t length = 0;
1017 for (int i = 0; i < count; i++) {
1018 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1019 }
1020 char* s = NEW_RESOURCE_ARRAY(char, length);
1021 char* dst = s;
1022 for (int j = 0; j < count; j++) {
1023 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1024 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1025 dst += offset;
1026 length -= offset;
1027 }
1028 return (const char*) s;
1029 }
1030
1031 void Arguments::print_on(outputStream* st) {
1032 st->print_cr("VM Arguments:");
1033 if (num_jvm_flags() > 0) {
1034 st->print("jvm_flags: "); print_jvm_flags_on(st);
1035 st->cr();
1036 }
1037 if (num_jvm_args() > 0) {
1038 st->print("jvm_args: "); print_jvm_args_on(st);
1039 st->cr();
1040 }
1041 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1042 if (_java_class_path != nullptr) {
1043 char* path = _java_class_path->value();
1044 size_t len = strlen(path);
1045 st->print("java_class_path (initial): ");
1046 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1047 if (len == 0) {
1048 st->print_raw_cr("<not set>");
1049 } else {
1050 st->print_raw_cr(path, len);
1051 }
1052 }
1053 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1054 }
1055
1056 void Arguments::print_summary_on(outputStream* st) {
1057 // Print the command line. Environment variables that are helpful for
1058 // reproducing the problem are written later in the hs_err file.
1059 // flags are from setting file
1060 if (num_jvm_flags() > 0) {
1061 st->print_raw("Settings File: ");
1062 print_jvm_flags_on(st);
1063 st->cr();
1064 }
1065 // args are the command line and environment variable arguments.
1066 st->print_raw("Command Line: ");
1067 if (num_jvm_args() > 0) {
1068 print_jvm_args_on(st);
1069 }
1070 // this is the classfile and any arguments to the java program
1071 if (java_command() != nullptr) {
1072 st->print("%s", java_command());
1073 }
1074 st->cr();
1075 }
1076
1077 void Arguments::print_jvm_flags_on(outputStream* st) {
1078 if (_num_jvm_flags > 0) {
1079 for (int i=0; i < _num_jvm_flags; i++) {
1080 st->print("%s ", _jvm_flags_array[i]);
1081 }
1082 }
1083 }
1084
1085 void Arguments::print_jvm_args_on(outputStream* st) {
1086 if (_num_jvm_args > 0) {
1087 for (int i=0; i < _num_jvm_args; i++) {
1088 st->print("%s ", _jvm_args_array[i]);
1089 }
1090 }
1091 }
1092
1093 bool Arguments::process_argument(const char* arg,
1094 jboolean ignore_unrecognized,
1095 JVMFlagOrigin origin) {
1096 JDK_Version since = JDK_Version();
1097
1098 if (parse_argument(arg, origin)) {
1099 return true;
1100 }
1101
1102 // Determine if the flag has '+', '-', or '=' characters.
1103 bool has_plus_minus = (*arg == '+' || *arg == '-');
1104 const char* const argname = has_plus_minus ? arg + 1 : arg;
1105
1106 size_t arg_len;
1107 const char* equal_sign = strchr(argname, '=');
1108 if (equal_sign == nullptr) {
1109 arg_len = strlen(argname);
1110 } else {
1111 arg_len = equal_sign - argname;
1112 }
1113
1114 // Only make the obsolete check for valid arguments.
1115 if (arg_len <= BUFLEN) {
1116 // Construct a string which consists only of the argument name without '+', '-', or '='.
1117 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1118 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1119 if (is_obsolete_flag(stripped_argname, &since)) {
1120 char version[256];
1121 since.to_string(version, sizeof(version));
1122 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1123 return true;
1124 }
1125 }
1126
1127 // For locked flags, report a custom error message if available.
1128 // Otherwise, report the standard unrecognized VM option.
1129 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1130 if (found_flag != nullptr) {
1131 char locked_message_buf[BUFLEN];
1132 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1133 if (strlen(locked_message_buf) != 0) {
1134 #ifdef PRODUCT
1135 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1136 if (ignore_unrecognized && mismatched) {
1137 return true;
1138 }
1139 #endif
1140 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1141 }
1142 if (found_flag->is_bool() && !has_plus_minus) {
1143 jio_fprintf(defaultStream::error_stream(),
1144 "Missing +/- setting for VM option '%s'\n", argname);
1145 } else if (!found_flag->is_bool() && has_plus_minus) {
1146 jio_fprintf(defaultStream::error_stream(),
1147 "Unexpected +/- setting in VM option '%s'\n", argname);
1148 } else {
1149 jio_fprintf(defaultStream::error_stream(),
1150 "Improperly specified VM option '%s'\n", argname);
1151 }
1152 } else {
1153 if (ignore_unrecognized) {
1154 return true;
1155 }
1156 jio_fprintf(defaultStream::error_stream(),
1157 "Unrecognized VM option '%s'\n", argname);
1158 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1159 if (fuzzy_matched != nullptr) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Did you mean '%s%s%s'?\n",
1162 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1163 fuzzy_matched->name(),
1164 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1165 }
1166 }
1167
1168 // allow for commandline "commenting out" options like -XX:#+Verbose
1169 return arg[0] == '#';
1170 }
1171
1172 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1173 FILE* stream = os::fopen(file_name, "rb");
1174 if (stream == nullptr) {
1175 if (should_exist) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Could not open settings file %s\n", file_name);
1178 return false;
1179 } else {
1180 return true;
1181 }
1182 }
1183
1184 char token[1024];
1185 int pos = 0;
1186
1187 bool in_white_space = true;
1188 bool in_comment = false;
1189 bool in_quote = false;
1190 int quote_c = 0;
1191 bool result = true;
1192
1193 int c = getc(stream);
1194 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1195 if (in_white_space) {
1196 if (in_comment) {
1197 if (c == '\n') in_comment = false;
1198 } else {
1199 if (c == '#') in_comment = true;
1200 else if (!isspace((unsigned char) c)) {
1201 in_white_space = false;
1202 token[pos++] = checked_cast<char>(c);
1203 }
1204 }
1205 } else {
1206 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1207 // token ends at newline, or at unquoted whitespace
1208 // this allows a way to include spaces in string-valued options
1209 token[pos] = '\0';
1210 logOption(token);
1211 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1212 build_jvm_flags(token);
1213 pos = 0;
1214 in_white_space = true;
1215 in_quote = false;
1216 } else if (!in_quote && (c == '\'' || c == '"')) {
1217 in_quote = true;
1218 quote_c = c;
1219 } else if (in_quote && (c == quote_c)) {
1220 in_quote = false;
1221 } else {
1222 token[pos++] = checked_cast<char>(c);
1223 }
1224 }
1225 c = getc(stream);
1226 }
1227 if (pos > 0) {
1228 token[pos] = '\0';
1229 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1230 build_jvm_flags(token);
1231 }
1232 fclose(stream);
1233 return result;
1234 }
1235
1236 //=============================================================================================================
1237 // Parsing of properties (-D)
1238
1239 const char* Arguments::get_property(const char* key) {
1240 return PropertyList_get_value(system_properties(), key);
1241 }
1242
1243 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1244 const char* eq = strchr(prop, '=');
1245 const char* key;
1246 const char* value = "";
1247
1248 if (eq == nullptr) {
1249 // property doesn't have a value, thus use passed string
1250 key = prop;
1251 } else {
1252 // property have a value, thus extract it and save to the
1253 // allocated string
1254 size_t key_len = eq - prop;
1255 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1256
1257 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1258 key = tmp_key;
1259
1260 value = &prop[key_len + 1];
1261 }
1262
1263 if (internal == ExternalProperty) {
1264 CDSConfig::check_incompatible_property(key, value);
1265 }
1266
1267 if (strcmp(key, "java.compiler") == 0) {
1268 // we no longer support java.compiler system property, log a warning and let it get
1269 // passed to Java, like any other system property
1270 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1271 // for applications using NONE or empty value, log a more informative message
1272 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1273 } else {
1274 warning("The java.compiler system property is obsolete and no longer supported.");
1275 }
1276 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1277 // sun.java.launcher.is_altjvm property is
1278 // private and is processed in process_sun_java_launcher_properties();
1279 // the sun.java.launcher property is passed on to the java application
1280 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1281 // append is true, writable is true, internal is false
1282 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1283 WriteableProperty, ExternalProperty);
1284 } else {
1285 if (strcmp(key, "sun.java.command") == 0) {
1286 char *old_java_command = _java_command;
1287 _java_command = os::strdup_check_oom(value, mtArguments);
1288 if (old_java_command != nullptr) {
1289 os::free(old_java_command);
1290 }
1291 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1292 // If this property is set on the command line then its value will be
1293 // displayed in VM error logs as the URL at which to submit such logs.
1294 // Normally the URL displayed in error logs is different from the value
1295 // of this system property, so a different property should have been
1296 // used here, but we leave this as-is in case someone depends upon it.
1297 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1298 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1299 // its value without going through the property list or making a Java call.
1300 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1301 if (old_java_vendor_url_bug != nullptr) {
1302 os::free((void *)old_java_vendor_url_bug);
1303 }
1304 }
1305
1306 // Create new property and add at the end of the list
1307 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1308 }
1309
1310 if (key != prop) {
1311 // SystemProperty copy passed value, thus free previously allocated
1312 // memory
1313 FreeHeap((void *)key);
1314 }
1315
1316 return true;
1317 }
1318
1319 //===========================================================================================================
1320 // Setting int/mixed/comp mode flags
1321
1322 void Arguments::set_mode_flags(Mode mode) {
1323 // Set up default values for all flags.
1324 // If you add a flag to any of the branches below,
1325 // add a default value for it here.
1326 _mode = mode;
1327
1328 // Ensure Agent_OnLoad has the correct initial values.
1329 // This may not be the final mode; mode may change later in onload phase.
1330 PropertyList_unique_add(&_system_properties, "java.vm.info",
1331 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1332
1333 UseInterpreter = true;
1334 UseCompiler = true;
1335 UseLoopCounter = true;
1336
1337 // Default values may be platform/compiler dependent -
1338 // use the saved values
1339 ClipInlining = Arguments::_ClipInlining;
1340 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1341 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1342 BackgroundCompilation = Arguments::_BackgroundCompilation;
1343
1344 // Change from defaults based on mode
1345 switch (mode) {
1346 default:
1347 ShouldNotReachHere();
1348 break;
1349 case _int:
1350 UseCompiler = false;
1351 UseLoopCounter = false;
1352 AlwaysCompileLoopMethods = false;
1353 UseOnStackReplacement = false;
1354 break;
1355 case _mixed:
1356 // same as default
1357 break;
1358 case _comp:
1359 UseInterpreter = false;
1360 BackgroundCompilation = false;
1361 ClipInlining = false;
1362 break;
1363 }
1364 }
1365
1366 // Conflict: required to use shared spaces (-Xshare:on), but
1367 // incompatible command line options were chosen.
1368 void Arguments::no_shared_spaces(const char* message) {
1369 if (RequireSharedSpaces) {
1370 jio_fprintf(defaultStream::error_stream(),
1371 "Class data sharing is inconsistent with other specified options.\n");
1372 vm_exit_during_initialization("Unable to use shared archive", message);
1373 } else {
1374 log_info(cds)("Unable to use shared archive: %s", message);
1375 UseSharedSpaces = false;
1376 }
1377 }
1378
1379 static void set_object_alignment() {
1380 // Object alignment.
1381 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1382 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1383 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1384 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1385 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1386 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1387
1388 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1389 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1390
1391 // Oop encoding heap max
1392 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1393 }
1394
1395 size_t Arguments::max_heap_for_compressed_oops() {
1396 // Avoid sign flip.
1397 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1398 // We need to fit both the null page and the heap into the memory budget, while
1399 // keeping alignment constraints of the heap. To guarantee the latter, as the
1400 // null page is located before the heap, we pad the null page to the conservative
1401 // maximum alignment that the GC may ever impose upon the heap.
1402 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1403 _conservative_max_heap_alignment);
1404
1405 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1406 NOT_LP64(ShouldNotReachHere(); return 0);
1407 }
1408
1409 void Arguments::set_use_compressed_oops() {
1410 #ifdef _LP64
1411 // MaxHeapSize is not set up properly at this point, but
1412 // the only value that can override MaxHeapSize if we are
1413 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1414 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1415
1416 if (max_heap_size <= max_heap_for_compressed_oops()) {
1417 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1418 FLAG_SET_ERGO(UseCompressedOops, true);
1419 }
1420 } else {
1421 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1422 warning("Max heap size too large for Compressed Oops");
1423 FLAG_SET_DEFAULT(UseCompressedOops, false);
1424 }
1425 }
1426 #endif // _LP64
1427 }
1428
1429 void Arguments::set_use_compressed_klass_ptrs() {
1430 #ifdef _LP64
1431 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1432 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1433 #endif // _LP64
1434 }
1435
1436 void Arguments::set_conservative_max_heap_alignment() {
1437 // The conservative maximum required alignment for the heap is the maximum of
1438 // the alignments imposed by several sources: any requirements from the heap
1439 // itself and the maximum page size we may run the VM with.
1440 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1441 _conservative_max_heap_alignment = MAX4(heap_alignment,
1442 os::vm_allocation_granularity(),
1443 os::max_page_size(),
1444 GCArguments::compute_heap_alignment());
1445 }
1446
1447 jint Arguments::set_ergonomics_flags() {
1448 GCConfig::initialize();
1449
1450 set_conservative_max_heap_alignment();
1451
1452 #ifdef _LP64
1453 set_use_compressed_oops();
1454 set_use_compressed_klass_ptrs();
1455
1456 // Also checks that certain machines are slower with compressed oops
1457 // in vm_version initialization code.
1458 #endif // _LP64
1459
1460 return JNI_OK;
1461 }
1462
1463 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1464 size_t max_allocatable;
1465 size_t result = limit;
1466 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1467 // The AggressiveHeap check is a temporary workaround to avoid calling
1468 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1469 // selected. This works because AggressiveHeap implies UseParallelGC
1470 // where we know the ratio will be 1. Once the AggressiveHeap option is
1471 // removed, this can be cleaned up.
1472 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1473 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1474 result = MIN2(result, max_allocatable / fraction);
1475 }
1476 return result;
1477 }
1478
1479 // Use static initialization to get the default before parsing
1480 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1481
1482 void Arguments::set_heap_size() {
1483 julong phys_mem;
1484
1485 // If the user specified one of these options, they
1486 // want specific memory sizing so do not limit memory
1487 // based on compressed oops addressability.
1488 // Also, memory limits will be calculated based on
1489 // available os physical memory, not our MaxRAM limit,
1490 // unless MaxRAM is also specified.
1491 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1492 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1493 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1494 !FLAG_IS_DEFAULT(MaxRAM));
1495 if (override_coop_limit) {
1496 if (FLAG_IS_DEFAULT(MaxRAM)) {
1497 phys_mem = os::physical_memory();
1498 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1499 } else {
1500 phys_mem = (julong)MaxRAM;
1501 }
1502 } else {
1503 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1504 : (julong)MaxRAM;
1505 }
1506
1507 // If the maximum heap size has not been set with -Xmx,
1508 // then set it as fraction of the size of physical memory,
1509 // respecting the maximum and minimum sizes of the heap.
1510 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1511 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1512 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1513 if (reasonable_min < MaxHeapSize) {
1514 // Small physical memory, so use a minimum fraction of it for the heap
1515 reasonable_max = reasonable_min;
1516 } else {
1517 // Not-small physical memory, so require a heap at least
1518 // as large as MaxHeapSize
1519 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1520 }
1521
1522 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1523 // Limit the heap size to ErgoHeapSizeLimit
1524 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1525 }
1526
1527 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1528
1529 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1530 // An initial heap size was specified on the command line,
1531 // so be sure that the maximum size is consistent. Done
1532 // after call to limit_heap_by_allocatable_memory because that
1533 // method might reduce the allocation size.
1534 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1535 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1536 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1537 }
1538
1539 #ifdef _LP64
1540 if (UseCompressedOops || UseCompressedClassPointers) {
1541 // HeapBaseMinAddress can be greater than default but not less than.
1542 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1543 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1544 // matches compressed oops printing flags
1545 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1546 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1547 DefaultHeapBaseMinAddress,
1548 DefaultHeapBaseMinAddress/G,
1549 HeapBaseMinAddress);
1550 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1551 }
1552 }
1553 }
1554 if (UseCompressedOops) {
1555 // Limit the heap size to the maximum possible when using compressed oops
1556 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1557
1558 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1559 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1560 // but it should be not less than default MaxHeapSize.
1561 max_coop_heap -= HeapBaseMinAddress;
1562 }
1563
1564 // If user specified flags prioritizing os physical
1565 // memory limits, then disable compressed oops if
1566 // limits exceed max_coop_heap and UseCompressedOops
1567 // was not specified.
1568 if (reasonable_max > max_coop_heap) {
1569 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1570 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1571 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1572 "Please check the setting of MaxRAMPercentage %5.2f."
1573 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1574 FLAG_SET_ERGO(UseCompressedOops, false);
1575 } else {
1576 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1577 }
1578 }
1579 }
1580 #endif // _LP64
1581
1582 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1583 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1584 }
1585
1586 // If the minimum or initial heap_size have not been set or requested to be set
1587 // ergonomically, set them accordingly.
1588 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1589 julong reasonable_minimum = (julong)(OldSize + NewSize);
1590
1591 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1592
1593 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1594
1595 if (InitialHeapSize == 0) {
1596 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1597 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1598
1599 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1600 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1601
1602 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1603 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1604 }
1605 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1606 // synchronize with InitialHeapSize to avoid errors with the default value.
1607 if (MinHeapSize == 0) {
1608 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1609 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1610 }
1611 }
1612 }
1613
1614 // This option inspects the machine and attempts to set various
1615 // parameters to be optimal for long-running, memory allocation
1616 // intensive jobs. It is intended for machines with large
1617 // amounts of cpu and memory.
1618 jint Arguments::set_aggressive_heap_flags() {
1619 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1620 // VM, but we may not be able to represent the total physical memory
1621 // available (like having 8gb of memory on a box but using a 32bit VM).
1622 // Thus, we need to make sure we're using a julong for intermediate
1623 // calculations.
1624 julong initHeapSize;
1625 julong total_memory = os::physical_memory();
1626
1627 if (total_memory < (julong) 256 * M) {
1628 jio_fprintf(defaultStream::error_stream(),
1629 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1630 vm_exit(1);
1631 }
1632
1633 // The heap size is half of available memory, or (at most)
1634 // all of possible memory less 160mb (leaving room for the OS
1635 // when using ISM). This is the maximum; because adaptive sizing
1636 // is turned on below, the actual space used may be smaller.
1637
1638 initHeapSize = MIN2(total_memory / (julong) 2,
1639 total_memory - (julong) 160 * M);
1640
1641 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1642
1643 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1644 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1645 return JNI_EINVAL;
1646 }
1647 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1648 return JNI_EINVAL;
1649 }
1650 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1651 return JNI_EINVAL;
1652 }
1653 }
1654 if (FLAG_IS_DEFAULT(NewSize)) {
1655 // Make the young generation 3/8ths of the total heap.
1656 if (FLAG_SET_CMDLINE(NewSize,
1657 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1658 return JNI_EINVAL;
1659 }
1660 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1661 return JNI_EINVAL;
1662 }
1663 }
1664
1665 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1666 FLAG_SET_DEFAULT(UseLargePages, true);
1667 #endif
1668
1669 // Increase some data structure sizes for efficiency
1670 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1671 return JNI_EINVAL;
1672 }
1673 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1674 return JNI_EINVAL;
1675 }
1676
1677 // See the OldPLABSize comment below, but replace 'after promotion'
1678 // with 'after copying'. YoungPLABSize is the size of the survivor
1679 // space per-gc-thread buffers. The default is 4kw.
1680 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1681 return JNI_EINVAL;
1682 }
1683
1684 // OldPLABSize is the size of the buffers in the old gen that
1685 // UseParallelGC uses to promote live data that doesn't fit in the
1686 // survivor spaces. At any given time, there's one for each gc thread.
1687 // The default size is 1kw. These buffers are rarely used, since the
1688 // survivor spaces are usually big enough. For specjbb, however, there
1689 // are occasions when there's lots of live data in the young gen
1690 // and we end up promoting some of it. We don't have a definite
1691 // explanation for why bumping OldPLABSize helps, but the theory
1692 // is that a bigger PLAB results in retaining something like the
1693 // original allocation order after promotion, which improves mutator
1694 // locality. A minor effect may be that larger PLABs reduce the
1695 // number of PLAB allocation events during gc. The value of 8kw
1696 // was arrived at by experimenting with specjbb.
1697 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1698 return JNI_EINVAL;
1699 }
1700
1701 // Enable parallel GC and adaptive generation sizing
1702 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1703 return JNI_EINVAL;
1704 }
1705
1706 // Encourage steady state memory management
1707 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1708 return JNI_EINVAL;
1709 }
1710
1711 return JNI_OK;
1712 }
1713
1714 // This must be called after ergonomics.
1715 void Arguments::set_bytecode_flags() {
1716 if (!RewriteBytecodes) {
1717 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1718 }
1719 }
1720
1721 // Aggressive optimization flags
1722 jint Arguments::set_aggressive_opts_flags() {
1723 #ifdef COMPILER2
1724 if (AggressiveUnboxing) {
1725 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1726 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1727 } else if (!EliminateAutoBox) {
1728 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1729 AggressiveUnboxing = false;
1730 }
1731 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1732 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1733 } else if (!DoEscapeAnalysis) {
1734 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1735 AggressiveUnboxing = false;
1736 }
1737 }
1738 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1739 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1740 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1741 }
1742 // Feed the cache size setting into the JDK
1743 char buffer[1024];
1744 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1745 if (!add_property(buffer)) {
1746 return JNI_ENOMEM;
1747 }
1748 }
1749 #endif
1750
1751 return JNI_OK;
1752 }
1753
1754 //===========================================================================================================
1755
1756 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1757 if (_sun_java_launcher != _default_java_launcher) {
1758 os::free(const_cast<char*>(_sun_java_launcher));
1759 }
1760 _sun_java_launcher = os::strdup_check_oom(launcher);
1761 }
1762
1763 bool Arguments::created_by_java_launcher() {
1764 assert(_sun_java_launcher != nullptr, "property must have value");
1765 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1766 }
1767
1768 bool Arguments::sun_java_launcher_is_altjvm() {
1769 return _sun_java_launcher_is_altjvm;
1770 }
1771
1772 //===========================================================================================================
1773 // Parsing of main arguments
1774
1775 unsigned int addreads_count = 0;
1776 unsigned int addexports_count = 0;
1777 unsigned int addopens_count = 0;
1778 unsigned int addmods_count = 0;
1779 unsigned int enable_native_access_count = 0;
1780
1781 // Check the consistency of vm_init_args
1782 bool Arguments::check_vm_args_consistency() {
1783 // Method for adding checks for flag consistency.
1784 // The intent is to warn the user of all possible conflicts,
1785 // before returning an error.
1786 // Note: Needs platform-dependent factoring.
1787 bool status = true;
1788
1789 if (TLABRefillWasteFraction == 0) {
1790 jio_fprintf(defaultStream::error_stream(),
1791 "TLABRefillWasteFraction should be a denominator, "
1792 "not " SIZE_FORMAT "\n",
1793 TLABRefillWasteFraction);
1794 status = false;
1795 }
1796
1797 status = CompilerConfig::check_args_consistency(status);
1798 #if INCLUDE_JVMCI
1799 if (status && EnableJVMCI) {
1800 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1801 AddProperty, UnwriteableProperty, InternalProperty);
1802 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1803 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1804 return false;
1805 }
1806 }
1807 }
1808 #endif
1809
1810 #if INCLUDE_JFR
1811 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1812 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1813 return false;
1814 }
1815 }
1816 #endif
1817
1818 #ifndef SUPPORT_RESERVED_STACK_AREA
1819 if (StackReservedPages != 0) {
1820 FLAG_SET_CMDLINE(StackReservedPages, 0);
1821 warning("Reserved Stack Area not supported on this platform");
1822 }
1823 #endif
1824
1825 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1826 // ObjectMonitorTable requires lightweight locking.
1827 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1828 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1829 }
1830
1831 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1832 if (LockingMode == LM_MONITOR) {
1833 jio_fprintf(defaultStream::error_stream(),
1834 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1835 return false;
1836 }
1837 #endif
1838 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1839 jio_fprintf(defaultStream::error_stream(),
1840 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1841 return false;
1842 }
1843 return status;
1844 }
1845
1846 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1847 const char* option_type) {
1848 if (ignore) return false;
1849
1850 const char* spacer = " ";
1851 if (option_type == nullptr) {
1852 option_type = ++spacer; // Set both to the empty string.
1853 }
1854
1855 jio_fprintf(defaultStream::error_stream(),
1856 "Unrecognized %s%soption: %s\n", option_type, spacer,
1857 option->optionString);
1858 return true;
1859 }
1860
1861 static const char* user_assertion_options[] = {
1862 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1863 };
1864
1865 static const char* system_assertion_options[] = {
1866 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1867 };
1868
1869 bool Arguments::parse_uint(const char* value,
1870 uint* uint_arg,
1871 uint min_size) {
1872 uint n;
1873 if (!parse_integer(value, &n)) {
1874 return false;
1875 }
1876 if (n >= min_size) {
1877 *uint_arg = n;
1878 return true;
1879 } else {
1880 return false;
1881 }
1882 }
1883
1884 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1885 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1886 CDSConfig::check_internal_module_property(prop_name, prop_value);
1887 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1888 char* property = AllocateHeap(prop_len, mtArguments);
1889 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1890 if (ret < 0 || ret >= (int)prop_len) {
1891 FreeHeap(property);
1892 return false;
1893 }
1894 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1895 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1896 // that multiple occurrences of the associated flag just causes the existing property value to be
1897 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1898 // to a property after we have finished flag processing.
1899 bool added = add_property(property, WriteableProperty, internal);
1900 FreeHeap(property);
1901 return added;
1902 }
1903
1904 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1905 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1906 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1907 const unsigned int props_count_limit = 1000;
1908 const int max_digits = 3;
1909 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1910
1911 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1912 if (count < props_count_limit) {
1913 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1914 char* property = AllocateHeap(prop_len, mtArguments);
1915 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1916 if (ret < 0 || ret >= (int)prop_len) {
1917 FreeHeap(property);
1918 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1919 return false;
1920 }
1921 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1922 FreeHeap(property);
1923 return added;
1924 }
1925
1926 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1927 return false;
1928 }
1929
1930 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1931 julong* long_arg,
1932 julong min_size,
1933 julong max_size) {
1934 if (!parse_integer(s, long_arg)) return arg_unreadable;
1935 return check_memory_size(*long_arg, min_size, max_size);
1936 }
1937
1938 // Parse JavaVMInitArgs structure
1939
1940 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1941 const JavaVMInitArgs *java_tool_options_args,
1942 const JavaVMInitArgs *java_options_args,
1943 const JavaVMInitArgs *cmd_line_args) {
1944 // Save default settings for some mode flags
1945 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1946 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1947 Arguments::_ClipInlining = ClipInlining;
1948 Arguments::_BackgroundCompilation = BackgroundCompilation;
1949
1950 // Remember the default value of SharedBaseAddress.
1951 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1952
1953 // Setup flags for mixed which is the default
1954 set_mode_flags(_mixed);
1955
1956 // Parse args structure generated from java.base vm options resource
1957 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1958 if (result != JNI_OK) {
1959 return result;
1960 }
1961
1962 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1963 // variable (if present).
1964 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1965 if (result != JNI_OK) {
1966 return result;
1967 }
1968
1969 // Parse args structure generated from the command line flags.
1970 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1971 if (result != JNI_OK) {
1972 return result;
1973 }
1974
1975 // Parse args structure generated from the _JAVA_OPTIONS environment
1976 // variable (if present) (mimics classic VM)
1977 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1978 if (result != JNI_OK) {
1979 return result;
1980 }
1981
1982 // Disable CDS for exploded image
1983 if (!has_jimage()) {
1984 no_shared_spaces("CDS disabled on exploded JDK");
1985 }
1986
1987 // We need to ensure processor and memory resources have been properly
1988 // configured - which may rely on arguments we just processed - before
1989 // doing the final argument processing. Any argument processing that
1990 // needs to know about processor and memory resources must occur after
1991 // this point.
1992
1993 os::init_container_support();
1994
1995 SystemMemoryBarrier::initialize();
1996
1997 // Do final processing now that all arguments have been parsed
1998 result = finalize_vm_init_args();
1999 if (result != JNI_OK) {
2000 return result;
2001 }
2002
2003 return JNI_OK;
2004 }
2005
2006 #if !INCLUDE_JVMTI
2007 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2008 // represents a valid JDWP agent. is_path==true denotes that we
2009 // are dealing with -agentpath (case where name is a path), otherwise with
2010 // -agentlib
2011 static bool valid_jdwp_agent(char *name, bool is_path) {
2012 char *_name;
2013 const char *_jdwp = "jdwp";
2014 size_t _len_jdwp, _len_prefix;
2015
2016 if (is_path) {
2017 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2018 return false;
2019 }
2020
2021 _name++; // skip past last path separator
2022 _len_prefix = strlen(JNI_LIB_PREFIX);
2023
2024 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2025 return false;
2026 }
2027
2028 _name += _len_prefix;
2029 _len_jdwp = strlen(_jdwp);
2030
2031 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2032 _name += _len_jdwp;
2033 }
2034 else {
2035 return false;
2036 }
2037
2038 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2039 return false;
2040 }
2041
2042 return true;
2043 }
2044
2045 if (strcmp(name, _jdwp) == 0) {
2046 return true;
2047 }
2048
2049 return false;
2050 }
2051 #endif
2052
2053 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2054 // --patch-module=<module>=<file>(<pathsep><file>)*
2055 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2056 // Find the equal sign between the module name and the path specification
2057 const char* module_equal = strchr(patch_mod_tail, '=');
2058 if (module_equal == nullptr) {
2059 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2060 return JNI_ERR;
2061 } else {
2062 // Pick out the module name
2063 size_t module_len = module_equal - patch_mod_tail;
2064 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2065 if (module_name != nullptr) {
2066 memcpy(module_name, patch_mod_tail, module_len);
2067 *(module_name + module_len) = '\0';
2068 // The path piece begins one past the module_equal sign
2069 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2070 FREE_C_HEAP_ARRAY(char, module_name);
2071 } else {
2072 return JNI_ENOMEM;
2073 }
2074 }
2075 return JNI_OK;
2076 }
2077
2078 // VALUECLASS_STR must match string used in the build
2079 #define VALUECLASS_STR "valueclasses"
2080 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2081
2082 // Finalize --patch-module args and --enable-preview related to value class module patches.
2083 // Create all numbered properties passing module patches.
2084 int Arguments::finalize_patch_module() {
2085 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2086 // are to be patched into the module.
2087 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2088 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2089 if (enable_preview() && EnableValhalla) {
2090 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2091 const char * fileSep = os::file_separator();
2092
2093 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2094 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2095 DIR* dir = os::opendir(valueclasses_dir);
2096 if (dir != nullptr) {
2097 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2098 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2099
2100 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2101 // Test if file ends-with "-valueclasses.jar"
2102 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2103 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2104 continue; // too short or not the expected suffix
2105 }
2106
2107 strcpy(module_name, entry->d_name);
2108 module_name[len] = '\0'; // truncate to just module-name
2109
2110 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2111 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2112 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2113 }
2114 FreeHeap(module_name);
2115 FreeHeap(path);
2116 os::closedir(dir);
2117 }
2118 FreeHeap(valueclasses_dir);
2119 }
2120
2121 // Create numbered properties for each module that has been patched either
2122 // by --patch-module or --enable-preview
2123 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2124 if (_patch_mod_prefix != nullptr) {
2125 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2126 unsigned int patch_mod_count = 0;
2127
2128 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2129 it != _patch_mod_prefix->end(); ++it) {
2130 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2131 (*it)->module_name(), (*it)->path_string());
2132 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2133 FreeHeap(prop_value);
2134 return JNI_ENOMEM;
2135 }
2136 }
2137 FreeHeap(prop_value);
2138 }
2139 return JNI_OK;
2140 }
2141
2142 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2143 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2144 // The min and max sizes match the values in globals.hpp, but scaled
2145 // with K. The values have been chosen so that alignment with page
2146 // size doesn't change the max value, which makes the conversions
2147 // back and forth between Xss value and ThreadStackSize value easier.
2148 // The values have also been chosen to fit inside a 32-bit signed type.
2149 const julong min_ThreadStackSize = 0;
2150 const julong max_ThreadStackSize = 1 * M;
2151
2152 // Make sure the above values match the range set in globals.hpp
2153 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2154 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2155 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2156
2157 const julong min_size = min_ThreadStackSize * K;
2158 const julong max_size = max_ThreadStackSize * K;
2159
2160 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2161
2162 julong size = 0;
2163 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2164 if (errcode != arg_in_range) {
2165 bool silent = (option == nullptr); // Allow testing to silence error messages
2166 if (!silent) {
2167 jio_fprintf(defaultStream::error_stream(),
2168 "Invalid thread stack size: %s\n", option->optionString);
2169 describe_range_error(errcode);
2170 }
2171 return JNI_EINVAL;
2172 }
2173
2174 // Internally track ThreadStackSize in units of 1024 bytes.
2175 const julong size_aligned = align_up(size, K);
2176 assert(size <= size_aligned,
2177 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2178 size, size_aligned);
2179
2180 const julong size_in_K = size_aligned / K;
2181 assert(size_in_K < (julong)max_intx,
2182 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2183 size_in_K);
2184
2185 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2186 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2187 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2188 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2189 max_expanded, size_in_K);
2190
2191 *out_ThreadStackSize = (intx)size_in_K;
2192
2193 return JNI_OK;
2194 }
2195
2196 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2197 // For match_option to return remaining or value part of option string
2198 const char* tail;
2199
2200 // iterate over arguments
2201 for (int index = 0; index < args->nOptions; index++) {
2202 bool is_absolute_path = false; // for -agentpath vs -agentlib
2203
2204 const JavaVMOption* option = args->options + index;
2205
2206 if (!match_option(option, "-Djava.class.path", &tail) &&
2207 !match_option(option, "-Dsun.java.command", &tail) &&
2208 !match_option(option, "-Dsun.java.launcher", &tail)) {
2209
2210 // add all jvm options to the jvm_args string. This string
2211 // is used later to set the java.vm.args PerfData string constant.
2212 // the -Djava.class.path and the -Dsun.java.command options are
2213 // omitted from jvm_args string as each have their own PerfData
2214 // string constant object.
2215 build_jvm_args(option->optionString);
2216 }
2217
2218 // -verbose:[class/module/gc/jni]
2219 if (match_option(option, "-verbose", &tail)) {
2220 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2221 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2222 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2223 } else if (!strcmp(tail, ":module")) {
2224 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2225 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2226 } else if (!strcmp(tail, ":gc")) {
2227 if (_legacyGCLogging.lastFlag == 0) {
2228 _legacyGCLogging.lastFlag = 1;
2229 }
2230 } else if (!strcmp(tail, ":jni")) {
2231 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2232 }
2233 // -da / -ea / -disableassertions / -enableassertions
2234 // These accept an optional class/package name separated by a colon, e.g.,
2235 // -da:java.lang.Thread.
2236 } else if (match_option(option, user_assertion_options, &tail, true)) {
2237 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2238 if (*tail == '\0') {
2239 JavaAssertions::setUserClassDefault(enable);
2240 } else {
2241 assert(*tail == ':', "bogus match by match_option()");
2242 JavaAssertions::addOption(tail + 1, enable);
2243 }
2244 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2245 } else if (match_option(option, system_assertion_options, &tail, false)) {
2246 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2247 JavaAssertions::setSystemClassDefault(enable);
2248 // -bootclasspath:
2249 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2250 jio_fprintf(defaultStream::output_stream(),
2251 "-Xbootclasspath is no longer a supported option.\n");
2252 return JNI_EINVAL;
2253 // -bootclasspath/a:
2254 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2255 Arguments::append_sysclasspath(tail);
2256 // -bootclasspath/p:
2257 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2258 jio_fprintf(defaultStream::output_stream(),
2259 "-Xbootclasspath/p is no longer a supported option.\n");
2260 return JNI_EINVAL;
2261 // -Xrun
2262 } else if (match_option(option, "-Xrun", &tail)) {
2263 if (tail != nullptr) {
2264 const char* pos = strchr(tail, ':');
2265 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2266 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2267 jio_snprintf(name, len + 1, "%s", tail);
2268
2269 char *options = nullptr;
2270 if(pos != nullptr) {
2271 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2272 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2273 }
2274 #if !INCLUDE_JVMTI
2275 if (strcmp(name, "jdwp") == 0) {
2276 jio_fprintf(defaultStream::error_stream(),
2277 "Debugging agents are not supported in this VM\n");
2278 return JNI_ERR;
2279 }
2280 #endif // !INCLUDE_JVMTI
2281 JvmtiAgentList::add_xrun(name, options, false);
2282 FREE_C_HEAP_ARRAY(char, name);
2283 FREE_C_HEAP_ARRAY(char, options);
2284 }
2285 } else if (match_option(option, "--add-reads=", &tail)) {
2286 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2287 return JNI_ENOMEM;
2288 }
2289 } else if (match_option(option, "--add-exports=", &tail)) {
2290 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2291 return JNI_ENOMEM;
2292 }
2293 } else if (match_option(option, "--add-opens=", &tail)) {
2294 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2295 return JNI_ENOMEM;
2296 }
2297 } else if (match_option(option, "--add-modules=", &tail)) {
2298 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2299 return JNI_ENOMEM;
2300 }
2301 } else if (match_option(option, "--enable-native-access=", &tail)) {
2302 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2303 return JNI_ENOMEM;
2304 }
2305 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2306 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2307 return JNI_ENOMEM;
2308 }
2309 } else if (match_option(option, "--limit-modules=", &tail)) {
2310 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2311 return JNI_ENOMEM;
2312 }
2313 } else if (match_option(option, "--module-path=", &tail)) {
2314 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2315 return JNI_ENOMEM;
2316 }
2317 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2318 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2319 return JNI_ENOMEM;
2320 }
2321 } else if (match_option(option, "--patch-module=", &tail)) {
2322 // --patch-module=<module>=<file>(<pathsep><file>)*
2323 int res = process_patch_mod_option(tail);
2324 if (res != JNI_OK) {
2325 return res;
2326 }
2327 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2328 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2329 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2330 AddProperty, WriteableProperty, InternalProperty);
2331 } else {
2332 jio_fprintf(defaultStream::error_stream(),
2333 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2334 return JNI_ERR;
2335 }
2336 } else if (match_option(option, "--illegal-access=", &tail)) {
2337 char version[256];
2338 JDK_Version::jdk(17).to_string(version, sizeof(version));
2339 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2340 // -agentlib and -agentpath
2341 } else if (match_option(option, "-agentlib:", &tail) ||
2342 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2343 if(tail != nullptr) {
2344 const char* pos = strchr(tail, '=');
2345 char* name;
2346 if (pos == nullptr) {
2347 name = os::strdup_check_oom(tail, mtArguments);
2348 } else {
2349 size_t len = pos - tail;
2350 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2351 memcpy(name, tail, len);
2352 name[len] = '\0';
2353 }
2354
2355 char *options = nullptr;
2356 if(pos != nullptr) {
2357 options = os::strdup_check_oom(pos + 1, mtArguments);
2358 }
2359 #if !INCLUDE_JVMTI
2360 if (valid_jdwp_agent(name, is_absolute_path)) {
2361 jio_fprintf(defaultStream::error_stream(),
2362 "Debugging agents are not supported in this VM\n");
2363 return JNI_ERR;
2364 }
2365 #endif // !INCLUDE_JVMTI
2366 JvmtiAgentList::add(name, options, is_absolute_path);
2367 os::free(name);
2368 os::free(options);
2369 }
2370 // -javaagent
2371 } else if (match_option(option, "-javaagent:", &tail)) {
2372 #if !INCLUDE_JVMTI
2373 jio_fprintf(defaultStream::error_stream(),
2374 "Instrumentation agents are not supported in this VM\n");
2375 return JNI_ERR;
2376 #else
2377 if (tail != nullptr) {
2378 size_t length = strlen(tail) + 1;
2379 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2380 jio_snprintf(options, length, "%s", tail);
2381 JvmtiAgentList::add("instrument", options, false);
2382 FREE_C_HEAP_ARRAY(char, options);
2383
2384 // java agents need module java.instrument
2385 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2386 return JNI_ENOMEM;
2387 }
2388 }
2389 #endif // !INCLUDE_JVMTI
2390 // --enable_preview
2391 } else if (match_option(option, "--enable-preview")) {
2392 set_enable_preview();
2393 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2394 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2395 return JNI_EINVAL;
2396 }
2397 // -Xnoclassgc
2398 } else if (match_option(option, "-Xnoclassgc")) {
2399 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2400 return JNI_EINVAL;
2401 }
2402 // -Xbatch
2403 } else if (match_option(option, "-Xbatch")) {
2404 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2405 return JNI_EINVAL;
2406 }
2407 // -Xmn for compatibility with other JVM vendors
2408 } else if (match_option(option, "-Xmn", &tail)) {
2409 julong long_initial_young_size = 0;
2410 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2411 if (errcode != arg_in_range) {
2412 jio_fprintf(defaultStream::error_stream(),
2413 "Invalid initial young generation size: %s\n", option->optionString);
2414 describe_range_error(errcode);
2415 return JNI_EINVAL;
2416 }
2417 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2418 return JNI_EINVAL;
2419 }
2420 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 // -Xms
2424 } else if (match_option(option, "-Xms", &tail)) {
2425 julong size = 0;
2426 // an initial heap size of 0 means automatically determine
2427 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2428 if (errcode != arg_in_range) {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Invalid initial heap size: %s\n", option->optionString);
2431 describe_range_error(errcode);
2432 return JNI_EINVAL;
2433 }
2434 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2435 return JNI_EINVAL;
2436 }
2437 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2438 return JNI_EINVAL;
2439 }
2440 // -Xmx
2441 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2442 julong long_max_heap_size = 0;
2443 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2444 if (errcode != arg_in_range) {
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Invalid maximum heap size: %s\n", option->optionString);
2447 describe_range_error(errcode);
2448 return JNI_EINVAL;
2449 }
2450 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2451 return JNI_EINVAL;
2452 }
2453 // Xmaxf
2454 } else if (match_option(option, "-Xmaxf", &tail)) {
2455 char* err;
2456 int maxf = (int)(strtod(tail, &err) * 100);
2457 if (*err != '\0' || *tail == '\0') {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Bad max heap free percentage size: %s\n",
2460 option->optionString);
2461 return JNI_EINVAL;
2462 } else {
2463 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2464 return JNI_EINVAL;
2465 }
2466 }
2467 // Xminf
2468 } else if (match_option(option, "-Xminf", &tail)) {
2469 char* err;
2470 int minf = (int)(strtod(tail, &err) * 100);
2471 if (*err != '\0' || *tail == '\0') {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Bad min heap free percentage size: %s\n",
2474 option->optionString);
2475 return JNI_EINVAL;
2476 } else {
2477 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2478 return JNI_EINVAL;
2479 }
2480 }
2481 // -Xss
2482 } else if (match_option(option, "-Xss", &tail)) {
2483 intx value = 0;
2484 jint err = parse_xss(option, tail, &value);
2485 if (err != JNI_OK) {
2486 return err;
2487 }
2488 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2489 return JNI_EINVAL;
2490 }
2491 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2492 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2493 julong long_ReservedCodeCacheSize = 0;
2494
2495 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2496 if (errcode != arg_in_range) {
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Invalid maximum code cache size: %s.\n", option->optionString);
2499 return JNI_EINVAL;
2500 }
2501 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2502 return JNI_EINVAL;
2503 }
2504 // -green
2505 } else if (match_option(option, "-green")) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Green threads support not available\n");
2508 return JNI_EINVAL;
2509 // -native
2510 } else if (match_option(option, "-native")) {
2511 // HotSpot always uses native threads, ignore silently for compatibility
2512 // -Xrs
2513 } else if (match_option(option, "-Xrs")) {
2514 // Classic/EVM option, new functionality
2515 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2516 return JNI_EINVAL;
2517 }
2518 // -Xprof
2519 } else if (match_option(option, "-Xprof")) {
2520 char version[256];
2521 // Obsolete in JDK 10
2522 JDK_Version::jdk(10).to_string(version, sizeof(version));
2523 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2524 // -Xinternalversion
2525 } else if (match_option(option, "-Xinternalversion")) {
2526 jio_fprintf(defaultStream::output_stream(), "%s\n",
2527 VM_Version::internal_vm_info_string());
2528 vm_exit(0);
2529 #ifndef PRODUCT
2530 // -Xprintflags
2531 } else if (match_option(option, "-Xprintflags")) {
2532 JVMFlag::printFlags(tty, false);
2533 vm_exit(0);
2534 #endif
2535 // -D
2536 } else if (match_option(option, "-D", &tail)) {
2537 const char* value;
2538 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2539 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2540 // abort if -Djava.endorsed.dirs is set
2541 jio_fprintf(defaultStream::output_stream(),
2542 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2543 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2544 return JNI_EINVAL;
2545 }
2546 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2547 *value != '\0' && strcmp(value, "\"\"") != 0) {
2548 // abort if -Djava.ext.dirs is set
2549 jio_fprintf(defaultStream::output_stream(),
2550 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2551 return JNI_EINVAL;
2552 }
2553 // Check for module related properties. They must be set using the modules
2554 // options. For example: use "--add-modules=java.sql", not
2555 // "-Djdk.module.addmods=java.sql"
2556 if (is_internal_module_property(option->optionString + 2)) {
2557 needs_module_property_warning = true;
2558 continue;
2559 }
2560 if (!add_property(tail)) {
2561 return JNI_ENOMEM;
2562 }
2563 // Out of the box management support
2564 if (match_option(option, "-Dcom.sun.management", &tail)) {
2565 #if INCLUDE_MANAGEMENT
2566 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2567 return JNI_EINVAL;
2568 }
2569 // management agent in module jdk.management.agent
2570 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2571 return JNI_ENOMEM;
2572 }
2573 #else
2574 jio_fprintf(defaultStream::output_stream(),
2575 "-Dcom.sun.management is not supported in this VM.\n");
2576 return JNI_ERR;
2577 #endif
2578 }
2579 // -Xint
2580 } else if (match_option(option, "-Xint")) {
2581 set_mode_flags(_int);
2582 mode_flag_cmd_line = true;
2583 // -Xmixed
2584 } else if (match_option(option, "-Xmixed")) {
2585 set_mode_flags(_mixed);
2586 mode_flag_cmd_line = true;
2587 // -Xcomp
2588 } else if (match_option(option, "-Xcomp")) {
2589 // for testing the compiler; turn off all flags that inhibit compilation
2590 set_mode_flags(_comp);
2591 mode_flag_cmd_line = true;
2592 // -Xshare:dump
2593 } else if (match_option(option, "-Xshare:dump")) {
2594 CDSConfig::enable_dumping_static_archive();
2595 // -Xshare:on
2596 } else if (match_option(option, "-Xshare:on")) {
2597 UseSharedSpaces = true;
2598 RequireSharedSpaces = true;
2599 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2600 } else if (match_option(option, "-Xshare:auto")) {
2601 UseSharedSpaces = true;
2602 RequireSharedSpaces = false;
2603 xshare_auto_cmd_line = true;
2604 // -Xshare:off
2605 } else if (match_option(option, "-Xshare:off")) {
2606 UseSharedSpaces = false;
2607 RequireSharedSpaces = false;
2608 // -Xverify
2609 } else if (match_option(option, "-Xverify", &tail)) {
2610 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2611 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2612 return JNI_EINVAL;
2613 }
2614 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2615 return JNI_EINVAL;
2616 }
2617 } else if (strcmp(tail, ":remote") == 0) {
2618 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2619 return JNI_EINVAL;
2620 }
2621 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2622 return JNI_EINVAL;
2623 }
2624 } else if (strcmp(tail, ":none") == 0) {
2625 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2626 return JNI_EINVAL;
2627 }
2628 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2632 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2633 return JNI_EINVAL;
2634 }
2635 // -Xdebug
2636 } else if (match_option(option, "-Xdebug")) {
2637 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2638 } else if (match_option(option, "-Xloggc:", &tail)) {
2639 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2640 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2641 _legacyGCLogging.lastFlag = 2;
2642 _legacyGCLogging.file = os::strdup_check_oom(tail);
2643 } else if (match_option(option, "-Xlog", &tail)) {
2644 bool ret = false;
2645 if (strcmp(tail, ":help") == 0) {
2646 fileStream stream(defaultStream::output_stream());
2647 LogConfiguration::print_command_line_help(&stream);
2648 vm_exit(0);
2649 } else if (strcmp(tail, ":disable") == 0) {
2650 LogConfiguration::disable_logging();
2651 ret = true;
2652 } else if (strcmp(tail, ":async") == 0) {
2653 LogConfiguration::set_async_mode(true);
2654 ret = true;
2655 } else if (*tail == '\0') {
2656 ret = LogConfiguration::parse_command_line_arguments();
2657 assert(ret, "-Xlog without arguments should never fail to parse");
2658 } else if (*tail == ':') {
2659 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2660 }
2661 if (ret == false) {
2662 jio_fprintf(defaultStream::error_stream(),
2663 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2664 tail);
2665 return JNI_EINVAL;
2666 }
2667 // JNI hooks
2668 } else if (match_option(option, "-Xcheck", &tail)) {
2669 if (!strcmp(tail, ":jni")) {
2670 #if !INCLUDE_JNI_CHECK
2671 warning("JNI CHECKING is not supported in this VM");
2672 #else
2673 CheckJNICalls = true;
2674 #endif // INCLUDE_JNI_CHECK
2675 } else if (is_bad_option(option, args->ignoreUnrecognized,
2676 "check")) {
2677 return JNI_EINVAL;
2678 }
2679 } else if (match_option(option, "vfprintf")) {
2680 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2681 } else if (match_option(option, "exit")) {
2682 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2683 } else if (match_option(option, "abort")) {
2684 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2685 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2686 // and the last option wins.
2687 } else if (match_option(option, "-XX:+NeverTenure")) {
2688 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2692 return JNI_EINVAL;
2693 }
2694 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2698 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2708 uint max_tenuring_thresh = 0;
2709 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2710 jio_fprintf(defaultStream::error_stream(),
2711 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2712 return JNI_EINVAL;
2713 }
2714
2715 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718
2719 if (MaxTenuringThreshold == 0) {
2720 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 } else {
2727 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 }
2734 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2735 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2736 return JNI_EINVAL;
2737 }
2738 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2739 return JNI_EINVAL;
2740 }
2741 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2742 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2743 return JNI_EINVAL;
2744 }
2745 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2749 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2756 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 } else if (match_option(option, "--finalization=", &tail)) {
2763 if (strcmp(tail, "enabled") == 0) {
2764 InstanceKlass::set_finalization_enabled(true);
2765 } else if (strcmp(tail, "disabled") == 0) {
2766 InstanceKlass::set_finalization_enabled(false);
2767 } else {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2770 tail);
2771 return JNI_EINVAL;
2772 }
2773 #if !defined(DTRACE_ENABLED)
2774 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2775 jio_fprintf(defaultStream::error_stream(),
2776 "DTraceMethodProbes flag is not applicable for this configuration\n");
2777 return JNI_EINVAL;
2778 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2779 jio_fprintf(defaultStream::error_stream(),
2780 "DTraceAllocProbes flag is not applicable for this configuration\n");
2781 return JNI_EINVAL;
2782 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2783 jio_fprintf(defaultStream::error_stream(),
2784 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2785 return JNI_EINVAL;
2786 #endif // !defined(DTRACE_ENABLED)
2787 #ifdef ASSERT
2788 } else if (match_option(option, "-XX:+FullGCALot")) {
2789 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2790 return JNI_EINVAL;
2791 }
2792 #endif
2793 #if !INCLUDE_MANAGEMENT
2794 } else if (match_option(option, "-XX:+ManagementServer")) {
2795 jio_fprintf(defaultStream::error_stream(),
2796 "ManagementServer is not supported in this VM.\n");
2797 return JNI_ERR;
2798 #endif // INCLUDE_MANAGEMENT
2799 #if INCLUDE_JVMCI
2800 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2801 if (EnableJVMCIProduct) {
2802 jio_fprintf(defaultStream::error_stream(),
2803 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2804 return JNI_EINVAL;
2805 }
2806 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2807 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2808 if (use_graal_jit) {
2809 const char* jvmci_compiler = get_property("jvmci.Compiler");
2810 if (jvmci_compiler != nullptr) {
2811 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2812 jio_fprintf(defaultStream::error_stream(),
2813 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2814 return JNI_ERR;
2815 }
2816 } else if (!add_property("jvmci.Compiler=graal")) {
2817 return JNI_ENOMEM;
2818 }
2819 }
2820
2821 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2822 if (EnableJVMCIProduct) {
2823 continue;
2824 }
2825 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2826 // Allow this flag if it has been unlocked.
2827 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2828 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2829 jio_fprintf(defaultStream::error_stream(),
2830 "Unable to enable JVMCI in product mode\n");
2831 return JNI_ERR;
2832 }
2833 }
2834 // The flag was locked so process normally to report that error
2835 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2836 return JNI_EINVAL;
2837 }
2838 #endif // INCLUDE_JVMCI
2839 #if INCLUDE_JFR
2840 } else if (match_jfr_option(&option)) {
2841 return JNI_EINVAL;
2842 #endif
2843 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2844 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2845 // already been handled
2846 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2847 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2848 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2849 return JNI_EINVAL;
2850 }
2851 }
2852 // Unknown option
2853 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2854 return JNI_ERR;
2855 }
2856 }
2857
2858 // PrintSharedArchiveAndExit will turn on
2859 // -Xshare:on
2860 // -Xlog:class+path=info
2861 if (PrintSharedArchiveAndExit) {
2862 UseSharedSpaces = true;
2863 RequireSharedSpaces = true;
2864 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2865 }
2866
2867 fix_appclasspath();
2868
2869 return JNI_OK;
2870 }
2871
2872 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2873 if (!allow_cds) {
2874 CDSConfig::set_module_patching_disables_cds();
2875 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2876 CDSConfig::set_java_base_module_patching_disables_cds();
2877 }
2878 }
2879
2880 // Create GrowableArray lazily, only if --patch-module has been specified
2881 if (_patch_mod_prefix == nullptr) {
2882 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2883 }
2884
2885 // Scan patches for matching module
2886 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2887 return (strcmp(module_name, patch->module_name()) == 0);
2888 });
2889 if (i == -1) {
2890 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2891 } else {
2892 if (allow_append) {
2893 // append path to existing module entry
2894 _patch_mod_prefix->at(i)->append_path(path);
2895 } else {
2896 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2897 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2898 } else {
2899 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2900 }
2901 }
2902 }
2903 }
2904
2905 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2906 //
2907 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2908 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2909 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2910 // path is treated as the current directory.
2911 //
2912 // This causes problems with CDS, which requires that all directories specified in the classpath
2913 // must be empty. In most cases, applications do NOT want to load classes from the current
2914 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2915 // scripts compatible with CDS.
2916 void Arguments::fix_appclasspath() {
2917 if (IgnoreEmptyClassPaths) {
2918 const char separator = *os::path_separator();
2919 const char* src = _java_class_path->value();
2920
2921 // skip over all the leading empty paths
2922 while (*src == separator) {
2923 src ++;
2924 }
2925
2926 char* copy = os::strdup_check_oom(src, mtArguments);
2927
2928 // trim all trailing empty paths
2929 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2930 *tail = '\0';
2931 }
2932
2933 char from[3] = {separator, separator, '\0'};
2934 char to [2] = {separator, '\0'};
2935 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2936 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2937 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2938 }
2939
2940 _java_class_path->set_writeable_value(copy);
2941 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2942 }
2943 }
2944
2945 jint Arguments::finalize_vm_init_args() {
2946 // check if the default lib/endorsed directory exists; if so, error
2947 char path[JVM_MAXPATHLEN];
2948 const char* fileSep = os::file_separator();
2949 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2950
2951 DIR* dir = os::opendir(path);
2952 if (dir != nullptr) {
2953 jio_fprintf(defaultStream::output_stream(),
2954 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2955 "in modular form will be supported via the concept of upgradeable modules.\n");
2956 os::closedir(dir);
2957 return JNI_ERR;
2958 }
2959
2960 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2961 dir = os::opendir(path);
2962 if (dir != nullptr) {
2963 jio_fprintf(defaultStream::output_stream(),
2964 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2965 "Use -classpath instead.\n.");
2966 os::closedir(dir);
2967 return JNI_ERR;
2968 }
2969
2970 // This must be done after all arguments have been processed
2971 // and the container support has been initialized since AggressiveHeap
2972 // relies on the amount of total memory available.
2973 if (AggressiveHeap) {
2974 jint result = set_aggressive_heap_flags();
2975 if (result != JNI_OK) {
2976 return result;
2977 }
2978 }
2979
2980 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2981 // but like -Xint, leave compilation thresholds unaffected.
2982 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2983 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2984 set_mode_flags(_int);
2985 }
2986
2987 #ifdef ZERO
2988 // Zero always runs in interpreted mode
2989 set_mode_flags(_int);
2990 #endif
2991
2992 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2993 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2994 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2995 }
2996
2997 #if !COMPILER2_OR_JVMCI
2998 // Don't degrade server performance for footprint
2999 if (FLAG_IS_DEFAULT(UseLargePages) &&
3000 MaxHeapSize < LargePageHeapSizeThreshold) {
3001 // No need for large granularity pages w/small heaps.
3002 // Note that large pages are enabled/disabled for both the
3003 // Java heap and the code cache.
3004 FLAG_SET_DEFAULT(UseLargePages, false);
3005 }
3006
3007 UNSUPPORTED_OPTION(ProfileInterpreter);
3008 #endif
3009
3010 // Parse the CompilationMode flag
3011 if (!CompilationModeFlag::initialize()) {
3012 return JNI_ERR;
3013 }
3014
3015 if (!check_vm_args_consistency()) {
3016 return JNI_ERR;
3017 }
3018
3019 // finalize --module-patch and related --enable-preview
3020 if (finalize_patch_module() != JNI_OK) {
3021 return JNI_ERR;
3022 }
3023
3024 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
3025 return JNI_ERR;
3026 }
3027
3028 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3029 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3030 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3031
3032 return JNI_OK;
3033 }
3034
3035 // Helper class for controlling the lifetime of JavaVMInitArgs
3036 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3037 // deleted on the destruction of the ScopedVMInitArgs object.
3038 class ScopedVMInitArgs : public StackObj {
3039 private:
3040 JavaVMInitArgs _args;
3041 char* _container_name;
3042 bool _is_set;
3043 char* _vm_options_file_arg;
3044
3045 public:
3046 ScopedVMInitArgs(const char *container_name) {
3047 _args.version = JNI_VERSION_1_2;
3048 _args.nOptions = 0;
3049 _args.options = nullptr;
3050 _args.ignoreUnrecognized = false;
3051 _container_name = (char *)container_name;
3052 _is_set = false;
3053 _vm_options_file_arg = nullptr;
3054 }
3055
3056 // Populates the JavaVMInitArgs object represented by this
3057 // ScopedVMInitArgs object with the arguments in options. The
3058 // allocated memory is deleted by the destructor. If this method
3059 // returns anything other than JNI_OK, then this object is in a
3060 // partially constructed state, and should be abandoned.
3061 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3062 _is_set = true;
3063 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3064 JavaVMOption, options->length(), mtArguments);
3065 if (options_arr == nullptr) {
3066 return JNI_ENOMEM;
3067 }
3068 _args.options = options_arr;
3069
3070 for (int i = 0; i < options->length(); i++) {
3071 options_arr[i] = options->at(i);
3072 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3073 if (options_arr[i].optionString == nullptr) {
3074 // Rely on the destructor to do cleanup.
3075 _args.nOptions = i;
3076 return JNI_ENOMEM;
3077 }
3078 }
3079
3080 _args.nOptions = options->length();
3081 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3082 return JNI_OK;
3083 }
3084
3085 JavaVMInitArgs* get() { return &_args; }
3086 char* container_name() { return _container_name; }
3087 bool is_set() { return _is_set; }
3088 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3089 char* vm_options_file_arg() { return _vm_options_file_arg; }
3090
3091 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3092 if (_vm_options_file_arg != nullptr) {
3093 os::free(_vm_options_file_arg);
3094 }
3095 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3096 }
3097
3098 ~ScopedVMInitArgs() {
3099 if (_vm_options_file_arg != nullptr) {
3100 os::free(_vm_options_file_arg);
3101 }
3102 if (_args.options == nullptr) return;
3103 for (int i = 0; i < _args.nOptions; i++) {
3104 os::free(_args.options[i].optionString);
3105 }
3106 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3107 }
3108
3109 // Insert options into this option list, to replace option at
3110 // vm_options_file_pos (-XX:VMOptionsFile)
3111 jint insert(const JavaVMInitArgs* args,
3112 const JavaVMInitArgs* args_to_insert,
3113 const int vm_options_file_pos) {
3114 assert(_args.options == nullptr, "shouldn't be set yet");
3115 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3116 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3117
3118 int length = args->nOptions + args_to_insert->nOptions - 1;
3119 // Construct new option array
3120 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3121 for (int i = 0; i < args->nOptions; i++) {
3122 if (i == vm_options_file_pos) {
3123 // insert the new options starting at the same place as the
3124 // -XX:VMOptionsFile option
3125 for (int j = 0; j < args_to_insert->nOptions; j++) {
3126 options.push(args_to_insert->options[j]);
3127 }
3128 } else {
3129 options.push(args->options[i]);
3130 }
3131 }
3132 // make into options array
3133 return set_args(&options);
3134 }
3135 };
3136
3137 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3138 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3139 }
3140
3141 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3142 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3143 }
3144
3145 jint Arguments::parse_options_environment_variable(const char* name,
3146 ScopedVMInitArgs* vm_args) {
3147 char *buffer = ::getenv(name);
3148
3149 // Don't check this environment variable if user has special privileges
3150 // (e.g. unix su command).
3151 if (buffer == nullptr || os::have_special_privileges()) {
3152 return JNI_OK;
3153 }
3154
3155 if ((buffer = os::strdup(buffer)) == nullptr) {
3156 return JNI_ENOMEM;
3157 }
3158
3159 jio_fprintf(defaultStream::error_stream(),
3160 "Picked up %s: %s\n", name, buffer);
3161
3162 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3163
3164 os::free(buffer);
3165 return retcode;
3166 }
3167
3168 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3169 // read file into buffer
3170 int fd = ::open(file_name, O_RDONLY);
3171 if (fd < 0) {
3172 jio_fprintf(defaultStream::error_stream(),
3173 "Could not open options file '%s'\n",
3174 file_name);
3175 return JNI_ERR;
3176 }
3177
3178 struct stat stbuf;
3179 int retcode = os::stat(file_name, &stbuf);
3180 if (retcode != 0) {
3181 jio_fprintf(defaultStream::error_stream(),
3182 "Could not stat options file '%s'\n",
3183 file_name);
3184 ::close(fd);
3185 return JNI_ERR;
3186 }
3187
3188 if (stbuf.st_size == 0) {
3189 // tell caller there is no option data and that is ok
3190 ::close(fd);
3191 return JNI_OK;
3192 }
3193
3194 // '+ 1' for null termination even with max bytes
3195 size_t bytes_alloc = stbuf.st_size + 1;
3196
3197 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3198 if (nullptr == buf) {
3199 jio_fprintf(defaultStream::error_stream(),
3200 "Could not allocate read buffer for options file parse\n");
3201 ::close(fd);
3202 return JNI_ENOMEM;
3203 }
3204
3205 memset(buf, 0, bytes_alloc);
3206
3207 // Fill buffer
3208 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3209 ::close(fd);
3210 if (bytes_read < 0) {
3211 FREE_C_HEAP_ARRAY(char, buf);
3212 jio_fprintf(defaultStream::error_stream(),
3213 "Could not read options file '%s'\n", file_name);
3214 return JNI_ERR;
3215 }
3216
3217 if (bytes_read == 0) {
3218 // tell caller there is no option data and that is ok
3219 FREE_C_HEAP_ARRAY(char, buf);
3220 return JNI_OK;
3221 }
3222
3223 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3224
3225 FREE_C_HEAP_ARRAY(char, buf);
3226 return retcode;
3227 }
3228
3229 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3230 // Construct option array
3231 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3232
3233 // some pointers to help with parsing
3234 char *buffer_end = buffer + buf_len;
3235 char *opt_hd = buffer;
3236 char *wrt = buffer;
3237 char *rd = buffer;
3238
3239 // parse all options
3240 while (rd < buffer_end) {
3241 // skip leading white space from the input string
3242 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3243 rd++;
3244 }
3245
3246 if (rd >= buffer_end) {
3247 break;
3248 }
3249
3250 // Remember this is where we found the head of the token.
3251 opt_hd = wrt;
3252
3253 // Tokens are strings of non white space characters separated
3254 // by one or more white spaces.
3255 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3256 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3257 int quote = *rd; // matching quote to look for
3258 rd++; // don't copy open quote
3259 while (rd < buffer_end && *rd != quote) {
3260 // include everything (even spaces)
3261 // up until the close quote
3262 *wrt++ = *rd++; // copy to option string
3263 }
3264
3265 if (rd < buffer_end) {
3266 rd++; // don't copy close quote
3267 } else {
3268 // did not see closing quote
3269 jio_fprintf(defaultStream::error_stream(),
3270 "Unmatched quote in %s\n", name);
3271 return JNI_ERR;
3272 }
3273 } else {
3274 *wrt++ = *rd++; // copy to option string
3275 }
3276 }
3277
3278 // steal a white space character and set it to null
3279 *wrt++ = '\0';
3280 // We now have a complete token
3281
3282 JavaVMOption option;
3283 option.optionString = opt_hd;
3284 option.extraInfo = nullptr;
3285
3286 options.append(option); // Fill in option
3287
3288 rd++; // Advance to next character
3289 }
3290
3291 // Fill out JavaVMInitArgs structure.
3292 return vm_args->set_args(&options);
3293 }
3294
3295 #ifndef PRODUCT
3296 // Determine whether LogVMOutput should be implicitly turned on.
3297 static bool use_vm_log() {
3298 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3299 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3300 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3301 PrintAssembly || TraceDeoptimization ||
3302 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3303 return true;
3304 }
3305
3306 #ifdef COMPILER1
3307 if (PrintC1Statistics) {
3308 return true;
3309 }
3310 #endif // COMPILER1
3311
3312 #ifdef COMPILER2
3313 if (PrintOptoAssembly || PrintOptoStatistics) {
3314 return true;
3315 }
3316 #endif // COMPILER2
3317
3318 return false;
3319 }
3320
3321 #endif // PRODUCT
3322
3323 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3324 for (int index = 0; index < args->nOptions; index++) {
3325 const JavaVMOption* option = args->options + index;
3326 const char* tail;
3327 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3328 return true;
3329 }
3330 }
3331 return false;
3332 }
3333
3334 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3335 const char* vm_options_file,
3336 const int vm_options_file_pos,
3337 ScopedVMInitArgs* vm_options_file_args,
3338 ScopedVMInitArgs* args_out) {
3339 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3340 if (code != JNI_OK) {
3341 return code;
3342 }
3343
3344 if (vm_options_file_args->get()->nOptions < 1) {
3345 return JNI_OK;
3346 }
3347
3348 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3349 jio_fprintf(defaultStream::error_stream(),
3350 "A VM options file may not refer to a VM options file. "
3351 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3352 "options file '%s' in options container '%s' is an error.\n",
3353 vm_options_file_args->vm_options_file_arg(),
3354 vm_options_file_args->container_name());
3355 return JNI_EINVAL;
3356 }
3357
3358 return args_out->insert(args, vm_options_file_args->get(),
3359 vm_options_file_pos);
3360 }
3361
3362 // Expand -XX:VMOptionsFile found in args_in as needed.
3363 // mod_args and args_out parameters may return values as needed.
3364 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3365 ScopedVMInitArgs* mod_args,
3366 JavaVMInitArgs** args_out) {
3367 jint code = match_special_option_and_act(args_in, mod_args);
3368 if (code != JNI_OK) {
3369 return code;
3370 }
3371
3372 if (mod_args->is_set()) {
3373 // args_in contains -XX:VMOptionsFile and mod_args contains the
3374 // original options from args_in along with the options expanded
3375 // from the VMOptionsFile. Return a short-hand to the caller.
3376 *args_out = mod_args->get();
3377 } else {
3378 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3379 }
3380 return JNI_OK;
3381 }
3382
3383 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3384 ScopedVMInitArgs* args_out) {
3385 // Remaining part of option string
3386 const char* tail;
3387 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3388
3389 for (int index = 0; index < args->nOptions; index++) {
3390 const JavaVMOption* option = args->options + index;
3391 if (match_option(option, "-XX:Flags=", &tail)) {
3392 Arguments::set_jvm_flags_file(tail);
3393 continue;
3394 }
3395 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3396 if (vm_options_file_args.found_vm_options_file_arg()) {
3397 jio_fprintf(defaultStream::error_stream(),
3398 "The option '%s' is already specified in the options "
3399 "container '%s' so the specification of '%s' in the "
3400 "same options container is an error.\n",
3401 vm_options_file_args.vm_options_file_arg(),
3402 vm_options_file_args.container_name(),
3403 option->optionString);
3404 return JNI_EINVAL;
3405 }
3406 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3407 // If there's a VMOptionsFile, parse that
3408 jint code = insert_vm_options_file(args, tail, index,
3409 &vm_options_file_args, args_out);
3410 if (code != JNI_OK) {
3411 return code;
3412 }
3413 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3414 if (args_out->is_set()) {
3415 // The VMOptions file inserted some options so switch 'args'
3416 // to the new set of options, and continue processing which
3417 // preserves "last option wins" semantics.
3418 args = args_out->get();
3419 // The first option from the VMOptionsFile replaces the
3420 // current option. So we back track to process the
3421 // replacement option.
3422 index--;
3423 }
3424 continue;
3425 }
3426 if (match_option(option, "-XX:+PrintVMOptions")) {
3427 PrintVMOptions = true;
3428 continue;
3429 }
3430 if (match_option(option, "-XX:-PrintVMOptions")) {
3431 PrintVMOptions = false;
3432 continue;
3433 }
3434 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3435 IgnoreUnrecognizedVMOptions = true;
3436 continue;
3437 }
3438 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3439 IgnoreUnrecognizedVMOptions = false;
3440 continue;
3441 }
3442 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3443 JVMFlag::printFlags(tty, false);
3444 vm_exit(0);
3445 }
3446
3447 #ifndef PRODUCT
3448 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3449 JVMFlag::printFlags(tty, true);
3450 vm_exit(0);
3451 }
3452 #endif
3453 }
3454 return JNI_OK;
3455 }
3456
3457 static void print_options(const JavaVMInitArgs *args) {
3458 const char* tail;
3459 for (int index = 0; index < args->nOptions; index++) {
3460 const JavaVMOption *option = args->options + index;
3461 if (match_option(option, "-XX:", &tail)) {
3462 logOption(tail);
3463 }
3464 }
3465 }
3466
3467 bool Arguments::handle_deprecated_print_gc_flags() {
3468 if (PrintGC) {
3469 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3470 }
3471 if (PrintGCDetails) {
3472 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3473 }
3474
3475 if (_legacyGCLogging.lastFlag == 2) {
3476 // -Xloggc was used to specify a filename
3477 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3478
3479 LogTarget(Error, logging) target;
3480 LogStream errstream(target);
3481 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3482 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3483 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3484 }
3485 return true;
3486 }
3487
3488 static void apply_debugger_ergo() {
3489 #ifdef ASSERT
3490 if (ReplayCompiles) {
3491 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3492 }
3493
3494 if (UseDebuggerErgo) {
3495 // Turn on sub-flags
3496 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3497 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3498 }
3499
3500 if (UseDebuggerErgo2) {
3501 // Debugging with limited number of CPUs
3502 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3503 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3504 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3505 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3506 }
3507 #endif // ASSERT
3508 }
3509
3510 // Parse entry point called from JNI_CreateJavaVM
3511
3512 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3513 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3514 JVMFlag::check_all_flag_declarations();
3515
3516 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3517 const char* hotspotrc = ".hotspotrc";
3518 bool settings_file_specified = false;
3519 bool needs_hotspotrc_warning = false;
3520 ScopedVMInitArgs initial_vm_options_args("");
3521 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3522 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3523
3524 // Pointers to current working set of containers
3525 JavaVMInitArgs* cur_cmd_args;
3526 JavaVMInitArgs* cur_vm_options_args;
3527 JavaVMInitArgs* cur_java_options_args;
3528 JavaVMInitArgs* cur_java_tool_options_args;
3529
3530 // Containers for modified/expanded options
3531 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3532 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3533 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3534 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3535
3536
3537 jint code =
3538 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3539 if (code != JNI_OK) {
3540 return code;
3541 }
3542
3543 code = parse_java_options_environment_variable(&initial_java_options_args);
3544 if (code != JNI_OK) {
3545 return code;
3546 }
3547
3548 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3549 char *vmoptions = ClassLoader::lookup_vm_options();
3550 if (vmoptions != nullptr) {
3551 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3552 FREE_C_HEAP_ARRAY(char, vmoptions);
3553 if (code != JNI_OK) {
3554 return code;
3555 }
3556 }
3557
3558 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3559 &mod_java_tool_options_args,
3560 &cur_java_tool_options_args);
3561 if (code != JNI_OK) {
3562 return code;
3563 }
3564
3565 code = expand_vm_options_as_needed(initial_cmd_args,
3566 &mod_cmd_args,
3567 &cur_cmd_args);
3568 if (code != JNI_OK) {
3569 return code;
3570 }
3571
3572 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3573 &mod_java_options_args,
3574 &cur_java_options_args);
3575 if (code != JNI_OK) {
3576 return code;
3577 }
3578
3579 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3580 &mod_vm_options_args,
3581 &cur_vm_options_args);
3582 if (code != JNI_OK) {
3583 return code;
3584 }
3585
3586 const char* flags_file = Arguments::get_jvm_flags_file();
3587 settings_file_specified = (flags_file != nullptr);
3588
3589 if (IgnoreUnrecognizedVMOptions) {
3590 cur_cmd_args->ignoreUnrecognized = true;
3591 cur_java_tool_options_args->ignoreUnrecognized = true;
3592 cur_java_options_args->ignoreUnrecognized = true;
3593 }
3594
3595 // Parse specified settings file
3596 if (settings_file_specified) {
3597 if (!process_settings_file(flags_file, true,
3598 cur_cmd_args->ignoreUnrecognized)) {
3599 return JNI_EINVAL;
3600 }
3601 } else {
3602 #ifdef ASSERT
3603 // Parse default .hotspotrc settings file
3604 if (!process_settings_file(".hotspotrc", false,
3605 cur_cmd_args->ignoreUnrecognized)) {
3606 return JNI_EINVAL;
3607 }
3608 #else
3609 struct stat buf;
3610 if (os::stat(hotspotrc, &buf) == 0) {
3611 needs_hotspotrc_warning = true;
3612 }
3613 #endif
3614 }
3615
3616 if (PrintVMOptions) {
3617 print_options(cur_java_tool_options_args);
3618 print_options(cur_cmd_args);
3619 print_options(cur_java_options_args);
3620 }
3621
3622 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3623 jint result = parse_vm_init_args(cur_vm_options_args,
3624 cur_java_tool_options_args,
3625 cur_java_options_args,
3626 cur_cmd_args);
3627
3628 if (result != JNI_OK) {
3629 return result;
3630 }
3631
3632 // Delay warning until here so that we've had a chance to process
3633 // the -XX:-PrintWarnings flag
3634 if (needs_hotspotrc_warning) {
3635 warning("%s file is present but has been ignored. "
3636 "Run with -XX:Flags=%s to load the file.",
3637 hotspotrc, hotspotrc);
3638 }
3639
3640 if (needs_module_property_warning) {
3641 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3642 " names that are reserved for internal use.");
3643 }
3644
3645 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3646 UNSUPPORTED_OPTION(UseLargePages);
3647 #endif
3648
3649 #if defined(AIX)
3650 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3651 #endif
3652
3653 #ifndef PRODUCT
3654 if (TraceBytecodesAt != 0) {
3655 TraceBytecodes = true;
3656 }
3657 #endif // PRODUCT
3658
3659 if (ScavengeRootsInCode == 0) {
3660 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3661 warning("Forcing ScavengeRootsInCode non-zero");
3662 }
3663 ScavengeRootsInCode = 1;
3664 }
3665
3666 if (!handle_deprecated_print_gc_flags()) {
3667 return JNI_EINVAL;
3668 }
3669
3670 // Set object alignment values.
3671 set_object_alignment();
3672
3673 #if !INCLUDE_CDS
3674 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3675 jio_fprintf(defaultStream::error_stream(),
3676 "Shared spaces are not supported in this VM\n");
3677 return JNI_ERR;
3678 }
3679 if (DumpLoadedClassList != nullptr) {
3680 jio_fprintf(defaultStream::error_stream(),
3681 "DumpLoadedClassList is not supported in this VM\n");
3682 return JNI_ERR;
3683 }
3684 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3685 log_is_enabled(Info, cds)) {
3686 warning("Shared spaces are not supported in this VM");
3687 UseSharedSpaces = false;
3688 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3689 }
3690 no_shared_spaces("CDS Disabled");
3691 #endif // INCLUDE_CDS
3692
3693 // Verify NMT arguments
3694 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3695 if (lvl == NMT_unknown) {
3696 jio_fprintf(defaultStream::error_stream(),
3697 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3698 return JNI_ERR;
3699 }
3700 if (PrintNMTStatistics && lvl == NMT_off) {
3701 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3702 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3703 }
3704
3705 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3706 if (trace_dependencies && VerifyDependencies) {
3707 warning("dependency logging results may be inflated by VerifyDependencies");
3708 }
3709
3710 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3711 log_is_enabled(Info, class, load, cause);
3712 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3713 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3714 }
3715
3716 apply_debugger_ergo();
3717
3718 // The VMThread needs to stop now and then to execute these debug options.
3719 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3720 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3721 }
3722
3723 if (log_is_enabled(Info, arguments)) {
3724 LogStream st(Log(arguments)::info());
3725 Arguments::print_on(&st);
3726 }
3727
3728 return JNI_OK;
3729 }
3730
3731 jint Arguments::apply_ergo() {
3732 // Set flags based on ergonomics.
3733 jint result = set_ergonomics_flags();
3734 if (result != JNI_OK) return result;
3735
3736 // Set heap size based on available physical memory
3737 set_heap_size();
3738
3739 GCConfig::arguments()->initialize();
3740
3741 CDSConfig::initialize();
3742
3743 // Initialize Metaspace flags and alignments
3744 Metaspace::ergo_initialize();
3745
3746 if (!StringDedup::ergo_initialize()) {
3747 return JNI_EINVAL;
3748 }
3749
3750 // Set compiler flags after GC is selected and GC specific
3751 // flags (LoopStripMiningIter) are set.
3752 CompilerConfig::ergo_initialize();
3753
3754 // Set bytecode rewriting flags
3755 set_bytecode_flags();
3756
3757 // Set flags if aggressive optimization flags are enabled
3758 jint code = set_aggressive_opts_flags();
3759 if (code != JNI_OK) {
3760 return code;
3761 }
3762
3763 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3764 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3765 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3766 warning("UseSecondarySupersTable is not supported");
3767 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3768 }
3769 if (!UseSecondarySupersTable) {
3770 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3771 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3772 }
3773
3774 #ifdef ZERO
3775 // Clear flags not supported on zero.
3776 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3777 #endif // ZERO
3778
3779 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3780 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3781 DebugNonSafepoints = true;
3782 }
3783
3784 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3785 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3786 }
3787
3788 // Treat the odd case where local verification is enabled but remote
3789 // verification is not as if both were enabled.
3790 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3791 log_info(verification)("Turning on remote verification because local verification is on");
3792 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3793 }
3794 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3795 // Disable calling convention optimizations if inline types are not supported.
3796 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3797 // the CDS archive, as the values must match between dumptime and runtime.
3798 InlineTypePassFieldsAsArgs = false;
3799 InlineTypeReturnedAsFields = false;
3800 }
3801
3802 #ifndef PRODUCT
3803 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3804 if (use_vm_log()) {
3805 LogVMOutput = true;
3806 }
3807 }
3808 #endif // PRODUCT
3809
3810 if (PrintCommandLineFlags) {
3811 JVMFlag::printSetFlags(tty);
3812 }
3813
3814 #if COMPILER2_OR_JVMCI
3815 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3816 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3817 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3818 }
3819 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3820
3821 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3822 if (!EnableVectorReboxing) {
3823 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3824 } else {
3825 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3826 }
3827 }
3828 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3829
3830 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3831 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3832 }
3833 FLAG_SET_DEFAULT(UseVectorStubs, false);
3834 }
3835 #endif // COMPILER2_OR_JVMCI
3836
3837 if (log_is_enabled(Info, perf, class, link)) {
3838 if (!UsePerfData) {
3839 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3840 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3841 }
3842 }
3843
3844 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3845 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3846 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3847 }
3848 }
3849 return JNI_OK;
3850 }
3851
3852 jint Arguments::adjust_after_os() {
3853 if (UseNUMA) {
3854 if (UseParallelGC) {
3855 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3856 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3857 }
3858 }
3859 }
3860 return JNI_OK;
3861 }
3862
3863 int Arguments::PropertyList_count(SystemProperty* pl) {
3864 int count = 0;
3865 while(pl != nullptr) {
3866 count++;
3867 pl = pl->next();
3868 }
3869 return count;
3870 }
3871
3872 // Return the number of readable properties.
3873 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3874 int count = 0;
3875 while(pl != nullptr) {
3876 if (pl->readable()) {
3877 count++;
3878 }
3879 pl = pl->next();
3880 }
3881 return count;
3882 }
3883
3884 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3885 assert(key != nullptr, "just checking");
3886 SystemProperty* prop;
3887 for (prop = pl; prop != nullptr; prop = prop->next()) {
3888 if (strcmp(key, prop->key()) == 0) return prop->value();
3889 }
3890 return nullptr;
3891 }
3892
3893 // Return the value of the requested property provided that it is a readable property.
3894 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3895 assert(key != nullptr, "just checking");
3896 SystemProperty* prop;
3897 // Return the property value if the keys match and the property is not internal or
3898 // it's the special internal property "jdk.boot.class.path.append".
3899 for (prop = pl; prop != nullptr; prop = prop->next()) {
3900 if (strcmp(key, prop->key()) == 0) {
3901 if (!prop->internal()) {
3902 return prop->value();
3903 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3904 return prop->value();
3905 } else {
3906 // Property is internal and not jdk.boot.class.path.append so return null.
3907 return nullptr;
3908 }
3909 }
3910 }
3911 return nullptr;
3912 }
3913
3914 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3915 SystemProperty* p = *plist;
3916 if (p == nullptr) {
3917 *plist = new_p;
3918 } else {
3919 while (p->next() != nullptr) {
3920 p = p->next();
3921 }
3922 p->set_next(new_p);
3923 }
3924 }
3925
3926 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3927 bool writeable, bool internal) {
3928 if (plist == nullptr)
3929 return;
3930
3931 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3932 PropertyList_add(plist, new_p);
3933 }
3934
3935 void Arguments::PropertyList_add(SystemProperty *element) {
3936 PropertyList_add(&_system_properties, element);
3937 }
3938
3939 // This add maintains unique property key in the list.
3940 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3941 PropertyAppendable append, PropertyWriteable writeable,
3942 PropertyInternal internal) {
3943 if (plist == nullptr)
3944 return;
3945
3946 // If property key exists and is writeable, then update with new value.
3947 // Trying to update a non-writeable property is silently ignored.
3948 SystemProperty* prop;
3949 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3950 if (strcmp(k, prop->key()) == 0) {
3951 if (append == AppendProperty) {
3952 prop->append_writeable_value(v);
3953 } else {
3954 prop->set_writeable_value(v);
3955 }
3956 return;
3957 }
3958 }
3959
3960 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3961 }
3962
3963 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3964 // Returns true if all of the source pointed by src has been copied over to
3965 // the destination buffer pointed by buf. Otherwise, returns false.
3966 // Notes:
3967 // 1. If the length (buflen) of the destination buffer excluding the
3968 // null terminator character is not long enough for holding the expanded
3969 // pid characters, it also returns false instead of returning the partially
3970 // expanded one.
3971 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3972 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3973 char* buf, size_t buflen) {
3974 const char* p = src;
3975 char* b = buf;
3976 const char* src_end = &src[srclen];
3977 char* buf_end = &buf[buflen - 1];
3978
3979 while (p < src_end && b < buf_end) {
3980 if (*p == '%') {
3981 switch (*(++p)) {
3982 case '%': // "%%" ==> "%"
3983 *b++ = *p++;
3984 break;
3985 case 'p': { // "%p" ==> current process id
3986 // buf_end points to the character before the last character so
3987 // that we could write '\0' to the end of the buffer.
3988 size_t buf_sz = buf_end - b + 1;
3989 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3990
3991 // if jio_snprintf fails or the buffer is not long enough to hold
3992 // the expanded pid, returns false.
3993 if (ret < 0 || ret >= (int)buf_sz) {
3994 return false;
3995 } else {
3996 b += ret;
3997 assert(*b == '\0', "fail in copy_expand_pid");
3998 if (p == src_end && b == buf_end + 1) {
3999 // reach the end of the buffer.
4000 return true;
4001 }
4002 }
4003 p++;
4004 break;
4005 }
4006 default :
4007 *b++ = '%';
4008 }
4009 } else {
4010 *b++ = *p++;
4011 }
4012 }
4013 *b = '\0';
4014 return (p == src_end); // return false if not all of the source was copied
4015 }