1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/cds_globals.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "compiler/compilerDefinitions.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "gc/shared/genArguments.hpp"
36 #include "gc/shared/stringdedup/stringDedup.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "jvm.h"
39 #include "logging/log.hpp"
40 #include "logging/logConfiguration.hpp"
41 #include "logging/logStream.hpp"
42 #include "logging/logTag.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "nmt/nmtCommon.hpp"
45 #include "oops/compressedKlass.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/objLayout.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiAgentList.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/flags/jvmFlag.hpp"
53 #include "runtime/flags/jvmFlagAccess.hpp"
54 #include "runtime/flags/jvmFlagLimit.hpp"
55 #include "runtime/globals_extension.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepoint.hpp"
59 #include "runtime/safepointMechanism.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "services/management.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/checkedCast.hpp"
65 #include "utilities/debug.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/macros.hpp"
68 #include "utilities/parseInteger.hpp"
69 #include "utilities/powerOfTwo.hpp"
70 #include "utilities/stringUtils.hpp"
71 #include "utilities/systemMemoryBarrier.hpp"
72 #if INCLUDE_JFR
73 #include "jfr/jfr.hpp"
74 #endif
75
76 #include <limits>
77
78 static const char _default_java_launcher[] = "generic";
79
80 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
81
82 char* Arguments::_jvm_flags_file = nullptr;
83 char** Arguments::_jvm_flags_array = nullptr;
84 int Arguments::_num_jvm_flags = 0;
85 char** Arguments::_jvm_args_array = nullptr;
86 int Arguments::_num_jvm_args = 0;
87 unsigned int Arguments::_addmods_count = 0;
88 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104 bool Arguments::_has_jdwp_agent = 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 return internal_module_property_helper(property, false);
323 }
324
325 // Returns true if property is one of those recognized by is_internal_module_property() but
326 // is not supported by CDS archived full module graph.
327 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
328 return internal_module_property_helper(property, true);
329 }
330
331 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
332 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
333 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
334 if (matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
335 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
336 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
337 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
338 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
339 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
340 return true;
341 }
342
343 if (!check_for_cds) {
344 // CDS notes: these properties are supported by CDS archived full module graph.
345 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
346 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
347 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
348 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
349 return true;
350 }
351 }
352 }
353 return false;
354 }
355
356 // Process java launcher properties.
357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
359 // Must do this before setting up other system properties,
360 // as some of them may depend on launcher type.
361 for (int index = 0; index < args->nOptions; index++) {
362 const JavaVMOption* option = args->options + index;
363 const char* tail;
364
365 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
366 process_java_launcher_argument(tail, option->extraInfo);
367 continue;
368 }
369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
370 if (strcmp(tail, "true") == 0) {
371 _sun_java_launcher_is_altjvm = true;
372 }
373 continue;
374 }
375 }
376 }
377
378 // Initialize system properties key and value.
379 void Arguments::init_system_properties() {
380
381 // Set up _boot_class_path which is not a property but
382 // relies heavily on argument processing and the jdk.boot.class.path.append
383 // property. It is used to store the underlying boot class path.
384 _boot_class_path = new PathString(nullptr);
385
386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
387 "Java Virtual Machine Specification", false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
391
392 // Initialize the vm.info now, but it will need updating after argument parsing.
393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to nullptr and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
399 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
400 _java_home = new SystemProperty("java.home", nullptr, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414 PropertyList_add(&_system_properties, _vm_info);
415
416 // Set OS specific system properties values
417 os::init_system_properties_values();
418 }
419
420 // Update/Initialize System properties after JDK version number is known
421 void Arguments::init_version_specific_system_properties() {
422 enum { bufsz = 16 };
423 char buffer[bufsz];
424 const char* spec_vendor = "Oracle Corporation";
425 uint32_t spec_version = JDK_Version::current().major_version();
426
427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
428
429 PropertyList_add(&_system_properties,
430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.version", buffer, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
435 }
436
437 /*
438 * -XX argument processing:
439 *
440 * -XX arguments are defined in several places, such as:
441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
442 * -XX arguments are parsed in parse_argument().
443 * -XX argument bounds checking is done in check_vm_args_consistency().
444 *
445 * Over time -XX arguments may change. There are mechanisms to handle common cases:
446 *
447 * ALIASED: An option that is simply another name for another option. This is often
448 * part of the process of deprecating a flag, but not all aliases need
449 * to be deprecated.
450 *
451 * Create an alias for an option by adding the old and new option names to the
452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
453 *
454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
455 * support may be removed in the future. Both regular and aliased options may be
456 * deprecated.
457 *
458 * Add a deprecation warning for an option (or alias) by adding an entry in the
459 * "special_jvm_flags" table and setting the "deprecated_in" field.
460 * Often an option "deprecated" in one major release will
461 * be made "obsolete" in the next. In this case the entry should also have its
462 * "obsolete_in" field set.
463 *
464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
465 * on the command line. A warning is printed to let the user know that option might not
466 * be accepted in the future.
467 *
468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
469 * table and setting the "obsolete_in" field.
470 *
471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
472 * to the current JDK version. The system will flatly refuse to admit the existence of
473 * the flag. This allows a flag to die automatically over JDK releases.
474 *
475 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
477 * - Newly obsolete or expired deprecated options should have their global variable
478 * definitions removed (from globals.hpp, etc) and related implementations removed.
479 *
480 * Recommended approach for removing options:
481 *
482 * To remove options commonly used by customers (e.g. product -XX options), use
483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
484 *
485 * To remove internal options (e.g. diagnostic, experimental, develop options), use
486 * a 2-step model adding major release numbers to the obsolete and expire columns.
487 *
488 * To change the name of an option, use the alias table as well as a 2-step
489 * model adding major release numbers to the deprecate and expire columns.
490 * Think twice about aliasing commonly used customer options.
491 *
492 * There are times when it is appropriate to leave a future release number as undefined.
493 *
494 * Tests: Aliases should be tested in VMAliasOptions.java.
495 * Deprecated options should be tested in VMDeprecatedOptions.java.
496 */
497
498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
501 // the command-line as usual, but will issue a warning.
502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
503 // the command-line, while issuing a warning and ignoring the flag value.
504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
505 // existence of the flag.
506 //
507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
508 // This table ensures that the handling of options will update automatically when the JDK
509 // version is incremented, but the source code needs to be cleanup up manually:
510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
511 // variable should be removed, as well as users of the variable.
512 // - As "deprecated" options age into "obsolete" options, move the entry into the
513 // "Obsolete Flags" section of the table.
514 // - All expired options should be removed from the table.
515 static SpecialFlag const special_jvm_flags[] = {
516 // -------------- Deprecated Flags --------------
517 // --- Non-alias flags - sorted by obsolete_in then expired_in:
518 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
521 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
522 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
523 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
524 #ifdef LINUX
525 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
526 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
527 #endif
528 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
529 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
530 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
531
532 // -------------- Obsolete Flags - sorted by expired_in --------------
533
534 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
535 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
536 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
537
538 #ifdef ASSERT
539 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
540 #endif
541
542 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
543 // These entries will generate build errors. Their purpose is to test the macros.
544 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
545 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
546 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
547 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
548 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
549 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
551 #endif
552
553 { nullptr, JDK_Version(0), JDK_Version(0) }
554 };
555
556 // Flags that are aliases for other flags.
557 typedef struct {
558 const char* alias_name;
559 const char* real_name;
560 } AliasedFlag;
561
562 static AliasedFlag const aliased_jvm_flags[] = {
563 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
564 { nullptr, nullptr}
565 };
566
567 // Return true if "v" is less than "other", where "other" may be "undefined".
568 static bool version_less_than(JDK_Version v, JDK_Version other) {
569 assert(!v.is_undefined(), "must be defined");
570 if (!other.is_undefined() && v.compare(other) >= 0) {
571 return false;
572 } else {
573 return true;
574 }
575 }
576
577 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
578 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
579 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
580 flag = special_jvm_flags[i];
581 return true;
582 }
583 }
584 return false;
585 }
586
587 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
588 assert(version != nullptr, "Must provide a version buffer");
589 SpecialFlag flag;
590 if (lookup_special_flag(flag_name, flag)) {
591 if (!flag.obsolete_in.is_undefined()) {
592 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
593 *version = flag.obsolete_in;
594 // This flag may have been marked for obsoletion in this version, but we may not
595 // have actually removed it yet. Rather than ignoring it as soon as we reach
596 // this version we allow some time for the removal to happen. So if the flag
597 // still actually exists we process it as normal, but issue an adjusted warning.
598 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
599 if (real_flag != nullptr) {
600 char version_str[256];
601 version->to_string(version_str, sizeof(version_str));
602 warning("Temporarily processing option %s; support is scheduled for removal in %s",
603 flag_name, version_str);
604 return false;
605 }
606 return true;
607 }
608 }
609 }
610 return false;
611 }
612
613 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
614 assert(version != nullptr, "Must provide a version buffer");
615 SpecialFlag flag;
616 if (lookup_special_flag(flag_name, flag)) {
617 if (!flag.deprecated_in.is_undefined()) {
618 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
619 version_less_than(JDK_Version::current(), flag.expired_in)) {
620 *version = flag.deprecated_in;
621 return 1;
622 } else {
623 return -1;
624 }
625 }
626 }
627 return 0;
628 }
629
630 const char* Arguments::real_flag_name(const char *flag_name) {
631 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
632 const AliasedFlag& flag_status = aliased_jvm_flags[i];
633 if (strcmp(flag_status.alias_name, flag_name) == 0) {
634 return flag_status.real_name;
635 }
636 }
637 return flag_name;
638 }
639
640 #ifdef ASSERT
641 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
642 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
643 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
644 return true;
645 }
646 }
647 return false;
648 }
649
650 // Verifies the correctness of the entries in the special_jvm_flags table.
651 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
652 // version being earlier than the deprecation version, then a warning is issued
653 // and verification fails - by returning false. If it is detected that the table
654 // is out of date, with respect to the current version, then ideally a warning is
655 // issued but verification does not fail. This allows the VM to operate when the
656 // version is first updated, without needing to update all the impacted flags at
657 // the same time. In practice we can't issue the warning immediately when the version
658 // is updated as it occurs for every test and some tests are not prepared to handle
659 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
660 // if the check_globals flag is true, and in addition allow a grace period and only
661 // check for stale flags when we hit build 25 (which is far enough into the 6 month
662 // release cycle that all flag updates should have been processed, whilst still
663 // leaving time to make the change before RDP2).
664 // We use a gtest to call this, passing true, so that we can detect stale flags before
665 // the end of the release cycle.
666
667 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
668
669 bool Arguments::verify_special_jvm_flags(bool check_globals) {
670 bool success = true;
671 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
672 const SpecialFlag& flag = special_jvm_flags[i];
673 if (lookup_special_flag(flag.name, i)) {
674 warning("Duplicate special flag declaration \"%s\"", flag.name);
675 success = false;
676 }
677 if (flag.deprecated_in.is_undefined() &&
678 flag.obsolete_in.is_undefined()) {
679 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
680 success = false;
681 }
682
683 if (!flag.deprecated_in.is_undefined()) {
684 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
685 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
686 success = false;
687 }
688
689 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
690 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
691 success = false;
692 }
693 }
694
695 if (!flag.obsolete_in.is_undefined()) {
696 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
697 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
698 success = false;
699 }
700
701 // if flag has become obsolete it should not have a "globals" flag defined anymore.
702 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
703 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
704 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
705 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
706 success = false;
707 }
708 }
709
710 } else if (!flag.expired_in.is_undefined()) {
711 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
712 success = false;
713 }
714
715 if (!flag.expired_in.is_undefined()) {
716 // if flag has become expired it should not have a "globals" flag defined anymore.
717 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
718 !version_less_than(JDK_Version::current(), flag.expired_in)) {
719 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
720 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
721 success = false;
722 }
723 }
724 }
725 }
726 return success;
727 }
728 #endif
729
730 bool Arguments::atojulong(const char *s, julong* result) {
731 return parse_integer(s, result);
732 }
733
734 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
735 if (size < min_size) return arg_too_small;
736 if (size > max_size) return arg_too_big;
737 return arg_in_range;
738 }
739
740 // Describe an argument out of range error
741 void Arguments::describe_range_error(ArgsRange errcode) {
742 switch(errcode) {
743 case arg_too_big:
744 jio_fprintf(defaultStream::error_stream(),
745 "The specified size exceeds the maximum "
746 "representable size.\n");
747 break;
748 case arg_too_small:
749 case arg_unreadable:
750 case arg_in_range:
751 // do nothing for now
752 break;
753 default:
754 ShouldNotReachHere();
755 }
756 }
757
758 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
759 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
760 return true;
761 } else {
762 return false;
763 }
764 }
765
766 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
767 // strtod allows leading whitespace, but our flag format does not.
768 if (*value == '\0' || isspace((unsigned char) *value)) {
769 return false;
770 }
771 char* end;
772 errno = 0;
773 double v = strtod(value, &end);
774 if ((errno != 0) || (*end != 0)) {
775 return false;
776 }
777 if (g_isnan(v) || !g_isfinite(v)) {
778 // Currently we cannot handle these special values.
779 return false;
780 }
781
782 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
783 return true;
784 }
785 return false;
786 }
787
788 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
789 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
790
791 if (flag->is_int()) {
792 int v;
793 if (parse_integer(value, &v)) {
794 result = JVMFlagAccess::set_int(flag, &v, origin);
795 }
796 } else if (flag->is_uint()) {
797 uint v;
798 if (parse_integer(value, &v)) {
799 result = JVMFlagAccess::set_uint(flag, &v, origin);
800 }
801 } else if (flag->is_intx()) {
802 intx v;
803 if (parse_integer(value, &v)) {
804 result = JVMFlagAccess::set_intx(flag, &v, origin);
805 }
806 } else if (flag->is_uintx()) {
807 uintx v;
808 if (parse_integer(value, &v)) {
809 result = JVMFlagAccess::set_uintx(flag, &v, origin);
810 }
811 } else if (flag->is_uint64_t()) {
812 uint64_t v;
813 if (parse_integer(value, &v)) {
814 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
815 }
816 } else if (flag->is_size_t()) {
817 size_t v;
818 if (parse_integer(value, &v)) {
819 result = JVMFlagAccess::set_size_t(flag, &v, origin);
820 }
821 }
822
823 return result == JVMFlag::SUCCESS;
824 }
825
826 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
827 if (value[0] == '\0') {
828 value = nullptr;
829 }
830 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
831 // Contract: JVMFlag always returns a pointer that needs freeing.
832 FREE_C_HEAP_ARRAY(char, value);
833 return true;
834 }
835
836 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
837 const char* old_value = "";
838 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
839 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
840 size_t new_len = strlen(new_value);
841 const char* value;
842 char* free_this_too = nullptr;
843 if (old_len == 0) {
844 value = new_value;
845 } else if (new_len == 0) {
846 value = old_value;
847 } else {
848 size_t length = old_len + 1 + new_len + 1;
849 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
850 // each new setting adds another LINE to the switch:
851 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
852 value = buf;
853 free_this_too = buf;
854 }
855 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
856 // JVMFlag always returns a pointer that needs freeing.
857 FREE_C_HEAP_ARRAY(char, value);
858 // JVMFlag made its own copy, so I must delete my own temp. buffer.
859 FREE_C_HEAP_ARRAY(char, free_this_too);
860 return true;
861 }
862
863 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
864 const char* real_name = real_flag_name(arg);
865 JDK_Version since = JDK_Version();
866 switch (is_deprecated_flag(arg, &since)) {
867 case -1: {
868 // Obsolete or expired, so don't process normally,
869 // but allow for an obsolete flag we're still
870 // temporarily allowing.
871 if (!is_obsolete_flag(arg, &since)) {
872 return real_name;
873 }
874 // Note if we're not considered obsolete then we can't be expired either
875 // as obsoletion must come first.
876 return nullptr;
877 }
878 case 0:
879 return real_name;
880 case 1: {
881 char version[256];
882 since.to_string(version, sizeof(version));
883 if (real_name != arg) {
884 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
885 arg, version, real_name);
886 } else {
887 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
888 arg, version);
889 }
890 return real_name;
891 }
892 }
893 ShouldNotReachHere();
894 return nullptr;
895 }
896
897 #define BUFLEN 255
898
899 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
900 char name_copied[BUFLEN+1];
901 if (name[name_length] != 0) {
902 if (name_length > BUFLEN) {
903 return nullptr;
904 } else {
905 strncpy(name_copied, name, name_length);
906 name_copied[name_length] = '\0';
907 name = name_copied;
908 }
909 }
910
911 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
912 if (real_name == nullptr) {
913 return nullptr;
914 }
915 JVMFlag* flag = JVMFlag::find_flag(real_name);
916 return flag;
917 }
918
919 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
920 bool is_bool = false;
921 bool bool_val = false;
922 char c = *arg;
923 if (c == '+' || c == '-') {
924 is_bool = true;
925 bool_val = (c == '+');
926 arg++;
927 }
928
929 const char* name = arg;
930 while (true) {
931 c = *arg;
932 if (isalnum(c) || (c == '_')) {
933 ++arg;
934 } else {
935 break;
936 }
937 }
938
939 size_t name_len = size_t(arg - name);
940 if (name_len == 0) {
941 return false;
942 }
943
944 JVMFlag* flag = find_jvm_flag(name, name_len);
945 if (flag == nullptr) {
946 return false;
947 }
948
949 if (is_bool) {
950 if (*arg != 0) {
951 // Error -- extra characters such as -XX:+BoolFlag=123
952 return false;
953 }
954 return set_bool_flag(flag, bool_val, origin);
955 }
956
957 if (arg[0] == '=') {
958 const char* value = arg + 1;
959 if (flag->is_ccstr()) {
960 if (flag->ccstr_accumulates()) {
961 return append_to_string_flag(flag, value, origin);
962 } else {
963 return set_string_flag(flag, value, origin);
964 }
965 } else if (flag->is_double()) {
966 return set_fp_numeric_flag(flag, value, origin);
967 } else {
968 return set_numeric_flag(flag, value, origin);
969 }
970 }
971
972 if (arg[0] == ':' && arg[1] == '=') {
973 // -XX:Foo:=xxx will reset the string flag to the given value.
974 const char* value = arg + 2;
975 return set_string_flag(flag, value, origin);
976 }
977
978 return false;
979 }
980
981 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
982 assert(bldarray != nullptr, "illegal argument");
983
984 if (arg == nullptr) {
985 return;
986 }
987
988 int new_count = *count + 1;
989
990 // expand the array and add arg to the last element
991 if (*bldarray == nullptr) {
992 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
993 } else {
994 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
995 }
996 (*bldarray)[*count] = os::strdup_check_oom(arg);
997 *count = new_count;
998 }
999
1000 void Arguments::build_jvm_args(const char* arg) {
1001 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1002 }
1003
1004 void Arguments::build_jvm_flags(const char* arg) {
1005 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1006 }
1007
1008 // utility function to return a string that concatenates all
1009 // strings in a given char** array
1010 const char* Arguments::build_resource_string(char** args, int count) {
1011 if (args == nullptr || count == 0) {
1012 return nullptr;
1013 }
1014 size_t length = 0;
1015 for (int i = 0; i < count; i++) {
1016 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1017 }
1018 char* s = NEW_RESOURCE_ARRAY(char, length);
1019 char* dst = s;
1020 for (int j = 0; j < count; j++) {
1021 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1022 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1023 dst += offset;
1024 length -= offset;
1025 }
1026 return (const char*) s;
1027 }
1028
1029 void Arguments::print_on(outputStream* st) {
1030 st->print_cr("VM Arguments:");
1031 if (num_jvm_flags() > 0) {
1032 st->print("jvm_flags: "); print_jvm_flags_on(st);
1033 st->cr();
1034 }
1035 if (num_jvm_args() > 0) {
1036 st->print("jvm_args: "); print_jvm_args_on(st);
1037 st->cr();
1038 }
1039 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1040 if (_java_class_path != nullptr) {
1041 char* path = _java_class_path->value();
1042 size_t len = strlen(path);
1043 st->print("java_class_path (initial): ");
1044 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1045 if (len == 0) {
1046 st->print_raw_cr("<not set>");
1047 } else {
1048 st->print_raw_cr(path, len);
1049 }
1050 }
1051 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1052 }
1053
1054 void Arguments::print_summary_on(outputStream* st) {
1055 // Print the command line. Environment variables that are helpful for
1056 // reproducing the problem are written later in the hs_err file.
1057 // flags are from setting file
1058 if (num_jvm_flags() > 0) {
1059 st->print_raw("Settings File: ");
1060 print_jvm_flags_on(st);
1061 st->cr();
1062 }
1063 // args are the command line and environment variable arguments.
1064 st->print_raw("Command Line: ");
1065 if (num_jvm_args() > 0) {
1066 print_jvm_args_on(st);
1067 }
1068 // this is the classfile and any arguments to the java program
1069 if (java_command() != nullptr) {
1070 st->print("%s", java_command());
1071 }
1072 st->cr();
1073 }
1074
1075 void Arguments::print_jvm_flags_on(outputStream* st) {
1076 if (_num_jvm_flags > 0) {
1077 for (int i=0; i < _num_jvm_flags; i++) {
1078 st->print("%s ", _jvm_flags_array[i]);
1079 }
1080 }
1081 }
1082
1083 void Arguments::print_jvm_args_on(outputStream* st) {
1084 if (_num_jvm_args > 0) {
1085 for (int i=0; i < _num_jvm_args; i++) {
1086 st->print("%s ", _jvm_args_array[i]);
1087 }
1088 }
1089 }
1090
1091 bool Arguments::process_argument(const char* arg,
1092 jboolean ignore_unrecognized,
1093 JVMFlagOrigin origin) {
1094 JDK_Version since = JDK_Version();
1095
1096 if (parse_argument(arg, origin)) {
1097 return true;
1098 }
1099
1100 // Determine if the flag has '+', '-', or '=' characters.
1101 bool has_plus_minus = (*arg == '+' || *arg == '-');
1102 const char* const argname = has_plus_minus ? arg + 1 : arg;
1103
1104 size_t arg_len;
1105 const char* equal_sign = strchr(argname, '=');
1106 if (equal_sign == nullptr) {
1107 arg_len = strlen(argname);
1108 } else {
1109 arg_len = equal_sign - argname;
1110 }
1111
1112 // Only make the obsolete check for valid arguments.
1113 if (arg_len <= BUFLEN) {
1114 // Construct a string which consists only of the argument name without '+', '-', or '='.
1115 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1116 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1117 if (is_obsolete_flag(stripped_argname, &since)) {
1118 char version[256];
1119 since.to_string(version, sizeof(version));
1120 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1121 return true;
1122 }
1123 }
1124
1125 // For locked flags, report a custom error message if available.
1126 // Otherwise, report the standard unrecognized VM option.
1127 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1128 if (found_flag != nullptr) {
1129 char locked_message_buf[BUFLEN];
1130 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1131 if (strlen(locked_message_buf) != 0) {
1132 #ifdef PRODUCT
1133 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1134 if (ignore_unrecognized && mismatched) {
1135 return true;
1136 }
1137 #endif
1138 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1139 }
1140 if (found_flag->is_bool() && !has_plus_minus) {
1141 jio_fprintf(defaultStream::error_stream(),
1142 "Missing +/- setting for VM option '%s'\n", argname);
1143 } else if (!found_flag->is_bool() && has_plus_minus) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Unexpected +/- setting in VM option '%s'\n", argname);
1146 } else {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Improperly specified VM option '%s'\n", argname);
1149 }
1150 } else {
1151 if (ignore_unrecognized) {
1152 return true;
1153 }
1154 jio_fprintf(defaultStream::error_stream(),
1155 "Unrecognized VM option '%s'\n", argname);
1156 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1157 if (fuzzy_matched != nullptr) {
1158 jio_fprintf(defaultStream::error_stream(),
1159 "Did you mean '%s%s%s'?\n",
1160 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1161 fuzzy_matched->name(),
1162 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1163 }
1164 }
1165
1166 // allow for commandline "commenting out" options like -XX:#+Verbose
1167 return arg[0] == '#';
1168 }
1169
1170 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1171 FILE* stream = os::fopen(file_name, "rb");
1172 if (stream == nullptr) {
1173 if (should_exist) {
1174 jio_fprintf(defaultStream::error_stream(),
1175 "Could not open settings file %s\n", file_name);
1176 return false;
1177 } else {
1178 return true;
1179 }
1180 }
1181
1182 char token[1024];
1183 int pos = 0;
1184
1185 bool in_white_space = true;
1186 bool in_comment = false;
1187 bool in_quote = false;
1188 int quote_c = 0;
1189 bool result = true;
1190
1191 int c = getc(stream);
1192 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1193 if (in_white_space) {
1194 if (in_comment) {
1195 if (c == '\n') in_comment = false;
1196 } else {
1197 if (c == '#') in_comment = true;
1198 else if (!isspace((unsigned char) c)) {
1199 in_white_space = false;
1200 token[pos++] = checked_cast<char>(c);
1201 }
1202 }
1203 } else {
1204 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1205 // token ends at newline, or at unquoted whitespace
1206 // this allows a way to include spaces in string-valued options
1207 token[pos] = '\0';
1208 logOption(token);
1209 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1210 build_jvm_flags(token);
1211 pos = 0;
1212 in_white_space = true;
1213 in_quote = false;
1214 } else if (!in_quote && (c == '\'' || c == '"')) {
1215 in_quote = true;
1216 quote_c = c;
1217 } else if (in_quote && (c == quote_c)) {
1218 in_quote = false;
1219 } else {
1220 token[pos++] = checked_cast<char>(c);
1221 }
1222 }
1223 c = getc(stream);
1224 }
1225 if (pos > 0) {
1226 token[pos] = '\0';
1227 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1228 build_jvm_flags(token);
1229 }
1230 fclose(stream);
1231 return result;
1232 }
1233
1234 //=============================================================================================================
1235 // Parsing of properties (-D)
1236
1237 const char* Arguments::get_property(const char* key) {
1238 return PropertyList_get_value(system_properties(), key);
1239 }
1240
1241 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1242 const char* eq = strchr(prop, '=');
1243 const char* key;
1244 const char* value = "";
1245
1246 if (eq == nullptr) {
1247 // property doesn't have a value, thus use passed string
1248 key = prop;
1249 } else {
1250 // property have a value, thus extract it and save to the
1251 // allocated string
1252 size_t key_len = eq - prop;
1253 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1254
1255 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1256 key = tmp_key;
1257
1258 value = &prop[key_len + 1];
1259 }
1260
1261 if (internal == ExternalProperty) {
1262 CDSConfig::check_incompatible_property(key, value);
1263 }
1264
1265 if (strcmp(key, "java.compiler") == 0) {
1266 // we no longer support java.compiler system property, log a warning and let it get
1267 // passed to Java, like any other system property
1268 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1269 // for applications using NONE or empty value, log a more informative message
1270 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1271 } else {
1272 warning("The java.compiler system property is obsolete and no longer supported.");
1273 }
1274 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1275 // sun.java.launcher.is_altjvm property is
1276 // private and is processed in process_sun_java_launcher_properties();
1277 // the sun.java.launcher property is passed on to the java application
1278 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1279 // append is true, writable is true, internal is false
1280 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1281 WriteableProperty, ExternalProperty);
1282 } else {
1283 if (strcmp(key, "sun.java.command") == 0) {
1284 char *old_java_command = _java_command;
1285 _java_command = os::strdup_check_oom(value, mtArguments);
1286 if (old_java_command != nullptr) {
1287 os::free(old_java_command);
1288 }
1289 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1290 // If this property is set on the command line then its value will be
1291 // displayed in VM error logs as the URL at which to submit such logs.
1292 // Normally the URL displayed in error logs is different from the value
1293 // of this system property, so a different property should have been
1294 // used here, but we leave this as-is in case someone depends upon it.
1295 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1296 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1297 // its value without going through the property list or making a Java call.
1298 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1299 if (old_java_vendor_url_bug != nullptr) {
1300 os::free((void *)old_java_vendor_url_bug);
1301 }
1302 }
1303
1304 // Create new property and add at the end of the list
1305 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1306 }
1307
1308 if (key != prop) {
1309 // SystemProperty copy passed value, thus free previously allocated
1310 // memory
1311 FreeHeap((void *)key);
1312 }
1313
1314 return true;
1315 }
1316
1317 //===========================================================================================================
1318 // Setting int/mixed/comp mode flags
1319
1320 void Arguments::set_mode_flags(Mode mode) {
1321 // Set up default values for all flags.
1322 // If you add a flag to any of the branches below,
1323 // add a default value for it here.
1324 _mode = mode;
1325
1326 // Ensure Agent_OnLoad has the correct initial values.
1327 // This may not be the final mode; mode may change later in onload phase.
1328 PropertyList_unique_add(&_system_properties, "java.vm.info",
1329 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1330
1331 UseInterpreter = true;
1332 UseCompiler = true;
1333 UseLoopCounter = true;
1334
1335 // Default values may be platform/compiler dependent -
1336 // use the saved values
1337 ClipInlining = Arguments::_ClipInlining;
1338 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1339 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1340 BackgroundCompilation = Arguments::_BackgroundCompilation;
1341
1342 // Change from defaults based on mode
1343 switch (mode) {
1344 default:
1345 ShouldNotReachHere();
1346 break;
1347 case _int:
1348 UseCompiler = false;
1349 UseLoopCounter = false;
1350 AlwaysCompileLoopMethods = false;
1351 UseOnStackReplacement = false;
1352 break;
1353 case _mixed:
1354 // same as default
1355 break;
1356 case _comp:
1357 UseInterpreter = false;
1358 BackgroundCompilation = false;
1359 ClipInlining = false;
1360 break;
1361 }
1362 }
1363
1364 // Conflict: required to use shared spaces (-Xshare:on), but
1365 // incompatible command line options were chosen.
1366 void Arguments::no_shared_spaces(const char* message) {
1367 if (RequireSharedSpaces) {
1368 log_error(cds)("%s is incompatible with other specified options.",
1369 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1370 if (CDSConfig::new_aot_flags_used()) {
1371 vm_exit_during_initialization("Unable to use AOT cache", message);
1372 } else {
1373 vm_exit_during_initialization("Unable to use shared archive", message);
1374 }
1375 } else {
1376 if (CDSConfig::new_aot_flags_used()) {
1377 log_warning(cds)("Unable to use AOT cache: %s", message);
1378 } else {
1379 log_info(cds)("Unable to use shared archive: %s", message);
1380 }
1381 UseSharedSpaces = false;
1382 }
1383 }
1384
1385 static void set_object_alignment() {
1386 // Object alignment.
1387 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1388 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1389 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1390 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1391 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1392 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1393
1394 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1395 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1396
1397 // Oop encoding heap max
1398 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1399 }
1400
1401 size_t Arguments::max_heap_for_compressed_oops() {
1402 // Avoid sign flip.
1403 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1404 // We need to fit both the null page and the heap into the memory budget, while
1405 // keeping alignment constraints of the heap. To guarantee the latter, as the
1406 // null page is located before the heap, we pad the null page to the conservative
1407 // maximum alignment that the GC may ever impose upon the heap.
1408 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1409 _conservative_max_heap_alignment);
1410
1411 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1412 NOT_LP64(ShouldNotReachHere(); return 0);
1413 }
1414
1415 void Arguments::set_use_compressed_oops() {
1416 #ifdef _LP64
1417 // MaxHeapSize is not set up properly at this point, but
1418 // the only value that can override MaxHeapSize if we are
1419 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1420 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1421
1422 if (max_heap_size <= max_heap_for_compressed_oops()) {
1423 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1424 FLAG_SET_ERGO(UseCompressedOops, true);
1425 }
1426 } else {
1427 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1428 warning("Max heap size too large for Compressed Oops");
1429 FLAG_SET_DEFAULT(UseCompressedOops, false);
1430 }
1431 }
1432 #endif // _LP64
1433 }
1434
1435 void Arguments::set_conservative_max_heap_alignment() {
1436 // The conservative maximum required alignment for the heap is the maximum of
1437 // the alignments imposed by several sources: any requirements from the heap
1438 // itself and the maximum page size we may run the VM with.
1439 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1440 _conservative_max_heap_alignment = MAX4(heap_alignment,
1441 os::vm_allocation_granularity(),
1442 os::max_page_size(),
1443 GCArguments::compute_heap_alignment());
1444 }
1445
1446 jint Arguments::set_ergonomics_flags() {
1447 GCConfig::initialize();
1448
1449 set_conservative_max_heap_alignment();
1450
1451 #ifdef _LP64
1452 set_use_compressed_oops();
1453
1454 // Also checks that certain machines are slower with compressed oops
1455 // in vm_version initialization code.
1456 #endif // _LP64
1457
1458 return JNI_OK;
1459 }
1460
1461 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1462 size_t max_allocatable;
1463 size_t result = limit;
1464 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1465 // The AggressiveHeap check is a temporary workaround to avoid calling
1466 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1467 // selected. This works because AggressiveHeap implies UseParallelGC
1468 // where we know the ratio will be 1. Once the AggressiveHeap option is
1469 // removed, this can be cleaned up.
1470 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1471 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1472 result = MIN2(result, max_allocatable / fraction);
1473 }
1474 return result;
1475 }
1476
1477 // Use static initialization to get the default before parsing
1478 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1479
1480 void Arguments::set_heap_size() {
1481 julong phys_mem;
1482
1483 // If the user specified one of these options, they
1484 // want specific memory sizing so do not limit memory
1485 // based on compressed oops addressability.
1486 // Also, memory limits will be calculated based on
1487 // available os physical memory, not our MaxRAM limit,
1488 // unless MaxRAM is also specified.
1489 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1490 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1491 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1492 !FLAG_IS_DEFAULT(MaxRAM));
1493 if (override_coop_limit) {
1494 if (FLAG_IS_DEFAULT(MaxRAM)) {
1495 phys_mem = os::physical_memory();
1496 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1497 } else {
1498 phys_mem = (julong)MaxRAM;
1499 }
1500 } else {
1501 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1502 : (julong)MaxRAM;
1503 }
1504
1505 // If the maximum heap size has not been set with -Xmx,
1506 // then set it as fraction of the size of physical memory,
1507 // respecting the maximum and minimum sizes of the heap.
1508 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1509 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1510 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1511 if (reasonable_min < MaxHeapSize) {
1512 // Small physical memory, so use a minimum fraction of it for the heap
1513 reasonable_max = reasonable_min;
1514 } else {
1515 // Not-small physical memory, so require a heap at least
1516 // as large as MaxHeapSize
1517 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1518 }
1519
1520 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1521 // Limit the heap size to ErgoHeapSizeLimit
1522 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1523 }
1524
1525 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1526
1527 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1528 // An initial heap size was specified on the command line,
1529 // so be sure that the maximum size is consistent. Done
1530 // after call to limit_heap_by_allocatable_memory because that
1531 // method might reduce the allocation size.
1532 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1533 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1534 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1535 }
1536
1537 #ifdef _LP64
1538 if (UseCompressedOops || UseCompressedClassPointers) {
1539 // HeapBaseMinAddress can be greater than default but not less than.
1540 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1541 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1542 // matches compressed oops printing flags
1543 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1544 " (%zuG) which is greater than value given %zu",
1545 DefaultHeapBaseMinAddress,
1546 DefaultHeapBaseMinAddress/G,
1547 HeapBaseMinAddress);
1548 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1549 }
1550 }
1551 }
1552 if (UseCompressedOops) {
1553 // Limit the heap size to the maximum possible when using compressed oops
1554 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1555
1556 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1557 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1558 // but it should be not less than default MaxHeapSize.
1559 max_coop_heap -= HeapBaseMinAddress;
1560 }
1561
1562 // If user specified flags prioritizing os physical
1563 // memory limits, then disable compressed oops if
1564 // limits exceed max_coop_heap and UseCompressedOops
1565 // was not specified.
1566 if (reasonable_max > max_coop_heap) {
1567 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1568 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1569 " max heap %zu > compressed oop heap %zu. "
1570 "Please check the setting of MaxRAMPercentage %5.2f."
1571 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1572 FLAG_SET_ERGO(UseCompressedOops, false);
1573 } else {
1574 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1575 }
1576 }
1577 }
1578 #endif // _LP64
1579
1580 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1581 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1582 }
1583
1584 // If the minimum or initial heap_size have not been set or requested to be set
1585 // ergonomically, set them accordingly.
1586 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1587 julong reasonable_minimum = (julong)(OldSize + NewSize);
1588
1589 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1590
1591 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1592
1593 if (InitialHeapSize == 0) {
1594 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1595 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1596
1597 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1598 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1599
1600 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1601 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1602 }
1603 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1604 // synchronize with InitialHeapSize to avoid errors with the default value.
1605 if (MinHeapSize == 0) {
1606 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1607 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1608 }
1609 }
1610 }
1611
1612 // This option inspects the machine and attempts to set various
1613 // parameters to be optimal for long-running, memory allocation
1614 // intensive jobs. It is intended for machines with large
1615 // amounts of cpu and memory.
1616 jint Arguments::set_aggressive_heap_flags() {
1617 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1618 // VM, but we may not be able to represent the total physical memory
1619 // available (like having 8gb of memory on a box but using a 32bit VM).
1620 // Thus, we need to make sure we're using a julong for intermediate
1621 // calculations.
1622 julong initHeapSize;
1623 julong total_memory = os::physical_memory();
1624
1625 if (total_memory < (julong) 256 * M) {
1626 jio_fprintf(defaultStream::error_stream(),
1627 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1628 vm_exit(1);
1629 }
1630
1631 // The heap size is half of available memory, or (at most)
1632 // all of possible memory less 160mb (leaving room for the OS
1633 // when using ISM). This is the maximum; because adaptive sizing
1634 // is turned on below, the actual space used may be smaller.
1635
1636 initHeapSize = MIN2(total_memory / (julong) 2,
1637 total_memory - (julong) 160 * M);
1638
1639 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1640
1641 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1642 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1643 return JNI_EINVAL;
1644 }
1645 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1646 return JNI_EINVAL;
1647 }
1648 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1649 return JNI_EINVAL;
1650 }
1651 }
1652 if (FLAG_IS_DEFAULT(NewSize)) {
1653 // Make the young generation 3/8ths of the total heap.
1654 if (FLAG_SET_CMDLINE(NewSize,
1655 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1656 return JNI_EINVAL;
1657 }
1658 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1659 return JNI_EINVAL;
1660 }
1661 }
1662
1663 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1664 FLAG_SET_DEFAULT(UseLargePages, true);
1665 #endif
1666
1667 // Increase some data structure sizes for efficiency
1668 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1669 return JNI_EINVAL;
1670 }
1671 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1672 return JNI_EINVAL;
1673 }
1674
1675 // See the OldPLABSize comment below, but replace 'after promotion'
1676 // with 'after copying'. YoungPLABSize is the size of the survivor
1677 // space per-gc-thread buffers. The default is 4kw.
1678 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1679 return JNI_EINVAL;
1680 }
1681
1682 // OldPLABSize is the size of the buffers in the old gen that
1683 // UseParallelGC uses to promote live data that doesn't fit in the
1684 // survivor spaces. At any given time, there's one for each gc thread.
1685 // The default size is 1kw. These buffers are rarely used, since the
1686 // survivor spaces are usually big enough. For specjbb, however, there
1687 // are occasions when there's lots of live data in the young gen
1688 // and we end up promoting some of it. We don't have a definite
1689 // explanation for why bumping OldPLABSize helps, but the theory
1690 // is that a bigger PLAB results in retaining something like the
1691 // original allocation order after promotion, which improves mutator
1692 // locality. A minor effect may be that larger PLABs reduce the
1693 // number of PLAB allocation events during gc. The value of 8kw
1694 // was arrived at by experimenting with specjbb.
1695 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1696 return JNI_EINVAL;
1697 }
1698
1699 // Enable parallel GC and adaptive generation sizing
1700 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1701 return JNI_EINVAL;
1702 }
1703
1704 // Encourage steady state memory management
1705 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1706 return JNI_EINVAL;
1707 }
1708
1709 return JNI_OK;
1710 }
1711
1712 // This must be called after ergonomics.
1713 void Arguments::set_bytecode_flags() {
1714 if (!RewriteBytecodes) {
1715 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1716 }
1717 }
1718
1719 // Aggressive optimization flags
1720 jint Arguments::set_aggressive_opts_flags() {
1721 #ifdef COMPILER2
1722 if (AggressiveUnboxing) {
1723 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1724 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1725 } else if (!EliminateAutoBox) {
1726 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1727 AggressiveUnboxing = false;
1728 }
1729 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1730 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1731 } else if (!DoEscapeAnalysis) {
1732 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1733 AggressiveUnboxing = false;
1734 }
1735 }
1736 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1737 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1738 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1739 }
1740 // Feed the cache size setting into the JDK
1741 char buffer[1024];
1742 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1743 if (!add_property(buffer)) {
1744 return JNI_ENOMEM;
1745 }
1746 }
1747 #endif
1748
1749 return JNI_OK;
1750 }
1751
1752 //===========================================================================================================
1753
1754 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1755 if (_sun_java_launcher != _default_java_launcher) {
1756 os::free(const_cast<char*>(_sun_java_launcher));
1757 }
1758 _sun_java_launcher = os::strdup_check_oom(launcher);
1759 }
1760
1761 bool Arguments::created_by_java_launcher() {
1762 assert(_sun_java_launcher != nullptr, "property must have value");
1763 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1764 }
1765
1766 bool Arguments::sun_java_launcher_is_altjvm() {
1767 return _sun_java_launcher_is_altjvm;
1768 }
1769
1770 //===========================================================================================================
1771 // Parsing of main arguments
1772
1773 static unsigned int addreads_count = 0;
1774 static unsigned int addexports_count = 0;
1775 static unsigned int addopens_count = 0;
1776 static unsigned int patch_mod_count = 0;
1777 static unsigned int enable_native_access_count = 0;
1778 static bool patch_mod_javabase = false;
1779
1780 // Check the consistency of vm_init_args
1781 bool Arguments::check_vm_args_consistency() {
1782 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1783 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line, xshare_auto_cmd_line)) {
1784 return false;
1785 }
1786
1787 // Method for adding checks for flag consistency.
1788 // The intent is to warn the user of all possible conflicts,
1789 // before returning an error.
1790 // Note: Needs platform-dependent factoring.
1791 bool status = true;
1792
1793 if (TLABRefillWasteFraction == 0) {
1794 jio_fprintf(defaultStream::error_stream(),
1795 "TLABRefillWasteFraction should be a denominator, "
1796 "not %zu\n",
1797 TLABRefillWasteFraction);
1798 status = false;
1799 }
1800
1801 status = CompilerConfig::check_args_consistency(status);
1802 #if INCLUDE_JVMCI
1803 if (status && EnableJVMCI) {
1804 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1805 AddProperty, UnwriteableProperty, InternalProperty);
1806 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1807 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1808 return false;
1809 }
1810 }
1811 }
1812 #endif
1813
1814 #if INCLUDE_JFR
1815 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1816 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1817 return false;
1818 }
1819 }
1820 #endif
1821
1822 #ifndef SUPPORT_RESERVED_STACK_AREA
1823 if (StackReservedPages != 0) {
1824 FLAG_SET_CMDLINE(StackReservedPages, 0);
1825 warning("Reserved Stack Area not supported on this platform");
1826 }
1827 #endif
1828
1829 #ifndef _LP64
1830 if (LockingMode == LM_LEGACY) {
1831 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1832 // Self-forwarding in bit 3 of the mark-word conflicts
1833 // with 4-byte-aligned stack-locks.
1834 warning("Legacy locking not supported on this platform");
1835 }
1836 #endif
1837
1838 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1839 // ObjectMonitorTable requires lightweight locking.
1840 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1841 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1842 }
1843
1844 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1845 if (LockingMode == LM_MONITOR) {
1846 jio_fprintf(defaultStream::error_stream(),
1847 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1848 return false;
1849 }
1850 #endif
1851 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1854 return false;
1855 }
1856 return status;
1857 }
1858
1859 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1860 const char* option_type) {
1861 if (ignore) return false;
1862
1863 const char* spacer = " ";
1864 if (option_type == nullptr) {
1865 option_type = ++spacer; // Set both to the empty string.
1866 }
1867
1868 jio_fprintf(defaultStream::error_stream(),
1869 "Unrecognized %s%soption: %s\n", option_type, spacer,
1870 option->optionString);
1871 return true;
1872 }
1873
1874 static const char* user_assertion_options[] = {
1875 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1876 };
1877
1878 static const char* system_assertion_options[] = {
1879 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1880 };
1881
1882 bool Arguments::parse_uint(const char* value,
1883 uint* uint_arg,
1884 uint min_size) {
1885 uint n;
1886 if (!parse_integer(value, &n)) {
1887 return false;
1888 }
1889 if (n >= min_size) {
1890 *uint_arg = n;
1891 return true;
1892 } else {
1893 return false;
1894 }
1895 }
1896
1897 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1898 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1899 CDSConfig::check_internal_module_property(prop_name, prop_value);
1900 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1901 char* property = AllocateHeap(prop_len, mtArguments);
1902 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1903 if (ret < 0 || ret >= (int)prop_len) {
1904 FreeHeap(property);
1905 return false;
1906 }
1907 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1908 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1909 // that multiple occurrences of the associated flag just causes the existing property value to be
1910 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1911 // to a property after we have finished flag processing.
1912 bool added = add_property(property, WriteableProperty, internal);
1913 FreeHeap(property);
1914 return added;
1915 }
1916
1917 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1918 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1919 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1920 const unsigned int props_count_limit = 1000;
1921 const int max_digits = 3;
1922 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1923
1924 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1925 if (count < props_count_limit) {
1926 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1927 char* property = AllocateHeap(prop_len, mtArguments);
1928 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1929 if (ret < 0 || ret >= (int)prop_len) {
1930 FreeHeap(property);
1931 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1932 return false;
1933 }
1934 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1935 FreeHeap(property);
1936 return added;
1937 }
1938
1939 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1940 return false;
1941 }
1942
1943 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1944 julong* long_arg,
1945 julong min_size,
1946 julong max_size) {
1947 if (!parse_integer(s, long_arg)) return arg_unreadable;
1948 return check_memory_size(*long_arg, min_size, max_size);
1949 }
1950
1951 // Parse JavaVMInitArgs (in the order of the parameters to this function)
1952 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1953 const JavaVMInitArgs *java_tool_options_args,
1954 const JavaVMInitArgs *cmd_line_args,
1955 const JavaVMInitArgs *java_options_args,
1956 const JavaVMInitArgs *aot_tool_options_args) {
1957 // Save default settings for some mode flags
1958 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1959 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1960 Arguments::_ClipInlining = ClipInlining;
1961 Arguments::_BackgroundCompilation = BackgroundCompilation;
1962
1963 // Remember the default value of SharedBaseAddress.
1964 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1965
1966 // Setup flags for mixed which is the default
1967 set_mode_flags(_mixed);
1968
1969 // Parse args generated from java.base vm options resource
1970 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1971 if (result != JNI_OK) {
1972 return result;
1973 }
1974
1975 // Parse args generated from JAVA_TOOL_OPTIONS environment
1976 // variable (if present).
1977 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1978 if (result != JNI_OK) {
1979 return result;
1980 }
1981
1982 // Parse args generated from the command line flags.
1983 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1984 if (result != JNI_OK) {
1985 return result;
1986 }
1987
1988 // Parse args generated from the _JAVA_OPTIONS environment
1989 // variable (if present) (mimics classic VM)
1990 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1991 if (result != JNI_OK) {
1992 return result;
1993 }
1994
1995 // Parse args generated from the AOT_TOOL_OPTIONS environment variable -- only if AOTMode is "create"
1996 if (aot_tool_options_args->nOptions > 0) {
1997 assert(AOTMode != nullptr && strcmp(AOTMode, "create") == 0, "Required for parsing AOT_TOOL_OPTIONS");
1998 for (int index = 0; index < aot_tool_options_args->nOptions; index++) {
1999 JavaVMOption* option = aot_tool_options_args->options + index;
2000 const char* optionString = option->optionString;
2001 if (strncmp(optionString, "-XX:AOTMode=", 12) == 0 &&
2002 strcmp(optionString, "-XX:AOTMode=create") != 0) {
2003 jio_fprintf(defaultStream::error_stream(),
2004 "Option %s cannot be specified in AOT_TOOL_OPTIONS\n", optionString);
2005 return JNI_ERR;
2006 }
2007 }
2008 result = parse_each_vm_init_arg(aot_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
2009 if (result != JNI_OK) {
2010 return result;
2011 }
2012 }
2013
2014 // Disable CDS for exploded image
2015 if (!has_jimage()) {
2016 no_shared_spaces("CDS disabled on exploded JDK");
2017 }
2018
2019 // We need to ensure processor and memory resources have been properly
2020 // configured - which may rely on arguments we just processed - before
2021 // doing the final argument processing. Any argument processing that
2022 // needs to know about processor and memory resources must occur after
2023 // this point.
2024
2025 os::init_container_support();
2026
2027 SystemMemoryBarrier::initialize();
2028
2029 // Do final processing now that all arguments have been parsed
2030 result = finalize_vm_init_args();
2031 if (result != JNI_OK) {
2032 return result;
2033 }
2034
2035 return JNI_OK;
2036 }
2037
2038 #if !INCLUDE_JVMTI || INCLUDE_CDS
2039 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2040 // represents a valid JDWP agent. is_path==true denotes that we
2041 // are dealing with -agentpath (case where name is a path), otherwise with
2042 // -agentlib
2043 static bool valid_jdwp_agent(char *name, bool is_path) {
2044 char *_name;
2045 const char *_jdwp = "jdwp";
2046 size_t _len_jdwp, _len_prefix;
2047
2048 if (is_path) {
2049 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2050 return false;
2051 }
2052
2053 _name++; // skip past last path separator
2054 _len_prefix = strlen(JNI_LIB_PREFIX);
2055
2056 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2057 return false;
2058 }
2059
2060 _name += _len_prefix;
2061 _len_jdwp = strlen(_jdwp);
2062
2063 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2064 _name += _len_jdwp;
2065 }
2066 else {
2067 return false;
2068 }
2069
2070 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2071 return false;
2072 }
2073
2074 return true;
2075 }
2076
2077 if (strcmp(name, _jdwp) == 0) {
2078 return true;
2079 }
2080
2081 return false;
2082 }
2083 #endif
2084
2085 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2086 // --patch-module=<module>=<file>(<pathsep><file>)*
2087 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2088 // Find the equal sign between the module name and the path specification
2089 const char* module_equal = strchr(patch_mod_tail, '=');
2090 if (module_equal == nullptr) {
2091 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2092 return JNI_ERR;
2093 } else {
2094 // Pick out the module name
2095 size_t module_len = module_equal - patch_mod_tail;
2096 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2097 if (module_name != nullptr) {
2098 memcpy(module_name, patch_mod_tail, module_len);
2099 *(module_name + module_len) = '\0';
2100 // The path piece begins one past the module_equal sign
2101 add_patch_mod_prefix(module_name, module_equal + 1);
2102 FREE_C_HEAP_ARRAY(char, module_name);
2103 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2104 return JNI_ENOMEM;
2105 }
2106 } else {
2107 return JNI_ENOMEM;
2108 }
2109 }
2110 return JNI_OK;
2111 }
2112
2113 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2114 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2115 // The min and max sizes match the values in globals.hpp, but scaled
2116 // with K. The values have been chosen so that alignment with page
2117 // size doesn't change the max value, which makes the conversions
2118 // back and forth between Xss value and ThreadStackSize value easier.
2119 // The values have also been chosen to fit inside a 32-bit signed type.
2120 const julong min_ThreadStackSize = 0;
2121 const julong max_ThreadStackSize = 1 * M;
2122
2123 // Make sure the above values match the range set in globals.hpp
2124 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2125 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2126 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2127
2128 const julong min_size = min_ThreadStackSize * K;
2129 const julong max_size = max_ThreadStackSize * K;
2130
2131 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2132
2133 julong size = 0;
2134 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2135 if (errcode != arg_in_range) {
2136 bool silent = (option == nullptr); // Allow testing to silence error messages
2137 if (!silent) {
2138 jio_fprintf(defaultStream::error_stream(),
2139 "Invalid thread stack size: %s\n", option->optionString);
2140 describe_range_error(errcode);
2141 }
2142 return JNI_EINVAL;
2143 }
2144
2145 // Internally track ThreadStackSize in units of 1024 bytes.
2146 const julong size_aligned = align_up(size, K);
2147 assert(size <= size_aligned,
2148 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2149 size, size_aligned);
2150
2151 const julong size_in_K = size_aligned / K;
2152 assert(size_in_K < (julong)max_intx,
2153 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2154 size_in_K);
2155
2156 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2157 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2158 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2159 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2160 max_expanded, size_in_K);
2161
2162 *out_ThreadStackSize = (intx)size_in_K;
2163
2164 return JNI_OK;
2165 }
2166
2167 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2168 // For match_option to return remaining or value part of option string
2169 const char* tail;
2170
2171 // iterate over arguments
2172 for (int index = 0; index < args->nOptions; index++) {
2173 bool is_absolute_path = false; // for -agentpath vs -agentlib
2174
2175 const JavaVMOption* option = args->options + index;
2176
2177 if (!match_option(option, "-Djava.class.path", &tail) &&
2178 !match_option(option, "-Dsun.java.command", &tail) &&
2179 !match_option(option, "-Dsun.java.launcher", &tail)) {
2180
2181 // add all jvm options to the jvm_args string. This string
2182 // is used later to set the java.vm.args PerfData string constant.
2183 // the -Djava.class.path and the -Dsun.java.command options are
2184 // omitted from jvm_args string as each have their own PerfData
2185 // string constant object.
2186 build_jvm_args(option->optionString);
2187 }
2188
2189 // -verbose:[class/module/gc/jni]
2190 if (match_option(option, "-verbose", &tail)) {
2191 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2192 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2193 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2194 } else if (!strcmp(tail, ":module")) {
2195 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2196 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2197 } else if (!strcmp(tail, ":gc")) {
2198 if (_legacyGCLogging.lastFlag == 0) {
2199 _legacyGCLogging.lastFlag = 1;
2200 }
2201 } else if (!strcmp(tail, ":jni")) {
2202 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2203 }
2204 // -da / -ea / -disableassertions / -enableassertions
2205 // These accept an optional class/package name separated by a colon, e.g.,
2206 // -da:java.lang.Thread.
2207 } else if (match_option(option, user_assertion_options, &tail, true)) {
2208 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2209 if (*tail == '\0') {
2210 JavaAssertions::setUserClassDefault(enable);
2211 } else {
2212 assert(*tail == ':', "bogus match by match_option()");
2213 JavaAssertions::addOption(tail + 1, enable);
2214 }
2215 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2216 } else if (match_option(option, system_assertion_options, &tail, false)) {
2217 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2218 JavaAssertions::setSystemClassDefault(enable);
2219 // -bootclasspath:
2220 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2221 jio_fprintf(defaultStream::output_stream(),
2222 "-Xbootclasspath is no longer a supported option.\n");
2223 return JNI_EINVAL;
2224 // -bootclasspath/a:
2225 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2226 Arguments::append_sysclasspath(tail);
2227 // -bootclasspath/p:
2228 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2229 jio_fprintf(defaultStream::output_stream(),
2230 "-Xbootclasspath/p is no longer a supported option.\n");
2231 return JNI_EINVAL;
2232 // -Xrun
2233 } else if (match_option(option, "-Xrun", &tail)) {
2234 if (tail != nullptr) {
2235 const char* pos = strchr(tail, ':');
2236 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2237 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2238 jio_snprintf(name, len + 1, "%s", tail);
2239
2240 char *options = nullptr;
2241 if(pos != nullptr) {
2242 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2243 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2244 }
2245 #if !INCLUDE_JVMTI
2246 if (strcmp(name, "jdwp") == 0) {
2247 jio_fprintf(defaultStream::error_stream(),
2248 "Debugging agents are not supported in this VM\n");
2249 return JNI_ERR;
2250 }
2251 #endif // !INCLUDE_JVMTI
2252 JvmtiAgentList::add_xrun(name, options, false);
2253 FREE_C_HEAP_ARRAY(char, name);
2254 FREE_C_HEAP_ARRAY(char, options);
2255 }
2256 } else if (match_option(option, "--add-reads=", &tail)) {
2257 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2258 return JNI_ENOMEM;
2259 }
2260 } else if (match_option(option, "--add-exports=", &tail)) {
2261 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2262 return JNI_ENOMEM;
2263 }
2264 } else if (match_option(option, "--add-opens=", &tail)) {
2265 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2266 return JNI_ENOMEM;
2267 }
2268 } else if (match_option(option, "--add-modules=", &tail)) {
2269 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2270 return JNI_ENOMEM;
2271 }
2272 } else if (match_option(option, "--enable-native-access=", &tail)) {
2273 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2274 return JNI_ENOMEM;
2275 }
2276 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2277 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2278 return JNI_ENOMEM;
2279 }
2280 } else if (match_option(option, "--limit-modules=", &tail)) {
2281 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2282 return JNI_ENOMEM;
2283 }
2284 } else if (match_option(option, "--module-path=", &tail)) {
2285 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2286 return JNI_ENOMEM;
2287 }
2288 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2289 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2290 return JNI_ENOMEM;
2291 }
2292 } else if (match_option(option, "--patch-module=", &tail)) {
2293 // --patch-module=<module>=<file>(<pathsep><file>)*
2294 int res = process_patch_mod_option(tail);
2295 if (res != JNI_OK) {
2296 return res;
2297 }
2298 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2299 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2300 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2301 AddProperty, WriteableProperty, InternalProperty);
2302 } else {
2303 jio_fprintf(defaultStream::error_stream(),
2304 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2305 return JNI_ERR;
2306 }
2307 } else if (match_option(option, "--illegal-access=", &tail)) {
2308 char version[256];
2309 JDK_Version::jdk(17).to_string(version, sizeof(version));
2310 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2311 // -agentlib and -agentpath
2312 } else if (match_option(option, "-agentlib:", &tail) ||
2313 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2314 if(tail != nullptr) {
2315 const char* pos = strchr(tail, '=');
2316 char* name;
2317 if (pos == nullptr) {
2318 name = os::strdup_check_oom(tail, mtArguments);
2319 } else {
2320 size_t len = pos - tail;
2321 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2322 memcpy(name, tail, len);
2323 name[len] = '\0';
2324 }
2325
2326 char *options = nullptr;
2327 if(pos != nullptr) {
2328 options = os::strdup_check_oom(pos + 1, mtArguments);
2329 }
2330 #if !INCLUDE_JVMTI
2331 if (valid_jdwp_agent(name, is_absolute_path)) {
2332 jio_fprintf(defaultStream::error_stream(),
2333 "Debugging agents are not supported in this VM\n");
2334 return JNI_ERR;
2335 }
2336 #elif INCLUDE_CDS
2337 if (valid_jdwp_agent(name, is_absolute_path)) {
2338 _has_jdwp_agent = true;
2339 }
2340 #endif // !INCLUDE_JVMTI
2341 JvmtiAgentList::add(name, options, is_absolute_path);
2342 os::free(name);
2343 os::free(options);
2344 }
2345 // -javaagent
2346 } else if (match_option(option, "-javaagent:", &tail)) {
2347 #if !INCLUDE_JVMTI
2348 jio_fprintf(defaultStream::error_stream(),
2349 "Instrumentation agents are not supported in this VM\n");
2350 return JNI_ERR;
2351 #else
2352 if (tail != nullptr) {
2353 size_t length = strlen(tail) + 1;
2354 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2355 jio_snprintf(options, length, "%s", tail);
2356 JvmtiAgentList::add("instrument", options, false);
2357 FREE_C_HEAP_ARRAY(char, options);
2358
2359 // java agents need module java.instrument
2360 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2361 return JNI_ENOMEM;
2362 }
2363 }
2364 #endif // !INCLUDE_JVMTI
2365 // --enable_preview
2366 } else if (match_option(option, "--enable-preview")) {
2367 set_enable_preview();
2368 // -Xnoclassgc
2369 } else if (match_option(option, "-Xnoclassgc")) {
2370 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2371 return JNI_EINVAL;
2372 }
2373 // -Xbatch
2374 } else if (match_option(option, "-Xbatch")) {
2375 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2376 return JNI_EINVAL;
2377 }
2378 // -Xmn for compatibility with other JVM vendors
2379 } else if (match_option(option, "-Xmn", &tail)) {
2380 julong long_initial_young_size = 0;
2381 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2382 if (errcode != arg_in_range) {
2383 jio_fprintf(defaultStream::error_stream(),
2384 "Invalid initial young generation size: %s\n", option->optionString);
2385 describe_range_error(errcode);
2386 return JNI_EINVAL;
2387 }
2388 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2389 return JNI_EINVAL;
2390 }
2391 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2392 return JNI_EINVAL;
2393 }
2394 // -Xms
2395 } else if (match_option(option, "-Xms", &tail)) {
2396 julong size = 0;
2397 // an initial heap size of 0 means automatically determine
2398 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2399 if (errcode != arg_in_range) {
2400 jio_fprintf(defaultStream::error_stream(),
2401 "Invalid initial heap size: %s\n", option->optionString);
2402 describe_range_error(errcode);
2403 return JNI_EINVAL;
2404 }
2405 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2406 return JNI_EINVAL;
2407 }
2408 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2409 return JNI_EINVAL;
2410 }
2411 // -Xmx
2412 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2413 julong long_max_heap_size = 0;
2414 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2415 if (errcode != arg_in_range) {
2416 jio_fprintf(defaultStream::error_stream(),
2417 "Invalid maximum heap size: %s\n", option->optionString);
2418 describe_range_error(errcode);
2419 return JNI_EINVAL;
2420 }
2421 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2422 return JNI_EINVAL;
2423 }
2424 // Xmaxf
2425 } else if (match_option(option, "-Xmaxf", &tail)) {
2426 char* err;
2427 int maxf = (int)(strtod(tail, &err) * 100);
2428 if (*err != '\0' || *tail == '\0') {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Bad max heap free percentage size: %s\n",
2431 option->optionString);
2432 return JNI_EINVAL;
2433 } else {
2434 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2435 return JNI_EINVAL;
2436 }
2437 }
2438 // Xminf
2439 } else if (match_option(option, "-Xminf", &tail)) {
2440 char* err;
2441 int minf = (int)(strtod(tail, &err) * 100);
2442 if (*err != '\0' || *tail == '\0') {
2443 jio_fprintf(defaultStream::error_stream(),
2444 "Bad min heap free percentage size: %s\n",
2445 option->optionString);
2446 return JNI_EINVAL;
2447 } else {
2448 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2449 return JNI_EINVAL;
2450 }
2451 }
2452 // -Xss
2453 } else if (match_option(option, "-Xss", &tail)) {
2454 intx value = 0;
2455 jint err = parse_xss(option, tail, &value);
2456 if (err != JNI_OK) {
2457 return err;
2458 }
2459 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2460 return JNI_EINVAL;
2461 }
2462 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2463 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2464 julong long_ReservedCodeCacheSize = 0;
2465
2466 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2467 if (errcode != arg_in_range) {
2468 jio_fprintf(defaultStream::error_stream(),
2469 "Invalid maximum code cache size: %s.\n", option->optionString);
2470 return JNI_EINVAL;
2471 }
2472 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2473 return JNI_EINVAL;
2474 }
2475 // -green
2476 } else if (match_option(option, "-green")) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "Green threads support not available\n");
2479 return JNI_EINVAL;
2480 // -native
2481 } else if (match_option(option, "-native")) {
2482 // HotSpot always uses native threads, ignore silently for compatibility
2483 // -Xrs
2484 } else if (match_option(option, "-Xrs")) {
2485 // Classic/EVM option, new functionality
2486 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2487 return JNI_EINVAL;
2488 }
2489 // -Xprof
2490 } else if (match_option(option, "-Xprof")) {
2491 char version[256];
2492 // Obsolete in JDK 10
2493 JDK_Version::jdk(10).to_string(version, sizeof(version));
2494 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2495 // -Xinternalversion
2496 } else if (match_option(option, "-Xinternalversion")) {
2497 jio_fprintf(defaultStream::output_stream(), "%s\n",
2498 VM_Version::internal_vm_info_string());
2499 vm_exit(0);
2500 #ifndef PRODUCT
2501 // -Xprintflags
2502 } else if (match_option(option, "-Xprintflags")) {
2503 JVMFlag::printFlags(tty, false);
2504 vm_exit(0);
2505 #endif
2506 // -D
2507 } else if (match_option(option, "-D", &tail)) {
2508 const char* value;
2509 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2510 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2511 // abort if -Djava.endorsed.dirs is set
2512 jio_fprintf(defaultStream::output_stream(),
2513 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2514 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2515 return JNI_EINVAL;
2516 }
2517 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2518 *value != '\0' && strcmp(value, "\"\"") != 0) {
2519 // abort if -Djava.ext.dirs is set
2520 jio_fprintf(defaultStream::output_stream(),
2521 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2522 return JNI_EINVAL;
2523 }
2524 // Check for module related properties. They must be set using the modules
2525 // options. For example: use "--add-modules=java.sql", not
2526 // "-Djdk.module.addmods=java.sql"
2527 if (is_internal_module_property(option->optionString + 2)) {
2528 needs_module_property_warning = true;
2529 continue;
2530 }
2531 if (!add_property(tail)) {
2532 return JNI_ENOMEM;
2533 }
2534 // Out of the box management support
2535 if (match_option(option, "-Dcom.sun.management", &tail)) {
2536 #if INCLUDE_MANAGEMENT
2537 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2538 return JNI_EINVAL;
2539 }
2540 // management agent in module jdk.management.agent
2541 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2542 return JNI_ENOMEM;
2543 }
2544 #else
2545 jio_fprintf(defaultStream::output_stream(),
2546 "-Dcom.sun.management is not supported in this VM.\n");
2547 return JNI_ERR;
2548 #endif
2549 }
2550 // -Xint
2551 } else if (match_option(option, "-Xint")) {
2552 set_mode_flags(_int);
2553 mode_flag_cmd_line = true;
2554 // -Xmixed
2555 } else if (match_option(option, "-Xmixed")) {
2556 set_mode_flags(_mixed);
2557 mode_flag_cmd_line = true;
2558 // -Xcomp
2559 } else if (match_option(option, "-Xcomp")) {
2560 // for testing the compiler; turn off all flags that inhibit compilation
2561 set_mode_flags(_comp);
2562 mode_flag_cmd_line = true;
2563 // -Xshare:dump
2564 } else if (match_option(option, "-Xshare:dump")) {
2565 CDSConfig::enable_dumping_static_archive();
2566 CDSConfig::set_old_cds_flags_used();
2567 // -Xshare:on
2568 } else if (match_option(option, "-Xshare:on")) {
2569 UseSharedSpaces = true;
2570 RequireSharedSpaces = true;
2571 CDSConfig::set_old_cds_flags_used();
2572 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2573 } else if (match_option(option, "-Xshare:auto")) {
2574 UseSharedSpaces = true;
2575 RequireSharedSpaces = false;
2576 xshare_auto_cmd_line = true;
2577 CDSConfig::set_old_cds_flags_used();
2578 // -Xshare:off
2579 } else if (match_option(option, "-Xshare:off")) {
2580 UseSharedSpaces = false;
2581 RequireSharedSpaces = false;
2582 CDSConfig::set_old_cds_flags_used();
2583 // -Xverify
2584 } else if (match_option(option, "-Xverify", &tail)) {
2585 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2586 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2587 return JNI_EINVAL;
2588 }
2589 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2590 return JNI_EINVAL;
2591 }
2592 } else if (strcmp(tail, ":remote") == 0) {
2593 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2594 return JNI_EINVAL;
2595 }
2596 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2597 return JNI_EINVAL;
2598 }
2599 } else if (strcmp(tail, ":none") == 0) {
2600 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2601 return JNI_EINVAL;
2602 }
2603 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2604 return JNI_EINVAL;
2605 }
2606 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2607 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2608 return JNI_EINVAL;
2609 }
2610 // -Xdebug
2611 } else if (match_option(option, "-Xdebug")) {
2612 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2613 } else if (match_option(option, "-Xloggc:", &tail)) {
2614 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2615 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2616 _legacyGCLogging.lastFlag = 2;
2617 _legacyGCLogging.file = os::strdup_check_oom(tail);
2618 } else if (match_option(option, "-Xlog", &tail)) {
2619 bool ret = false;
2620 if (strcmp(tail, ":help") == 0) {
2621 fileStream stream(defaultStream::output_stream());
2622 LogConfiguration::print_command_line_help(&stream);
2623 vm_exit(0);
2624 } else if (strcmp(tail, ":disable") == 0) {
2625 LogConfiguration::disable_logging();
2626 ret = true;
2627 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2628 const char* async_tail = tail + strlen(":async");
2629 ret = LogConfiguration::parse_async_argument(async_tail);
2630 } else if (*tail == '\0') {
2631 ret = LogConfiguration::parse_command_line_arguments();
2632 assert(ret, "-Xlog without arguments should never fail to parse");
2633 } else if (*tail == ':') {
2634 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2635 }
2636 if (ret == false) {
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2639 tail);
2640 return JNI_EINVAL;
2641 }
2642 // JNI hooks
2643 } else if (match_option(option, "-Xcheck", &tail)) {
2644 if (!strcmp(tail, ":jni")) {
2645 #if !INCLUDE_JNI_CHECK
2646 warning("JNI CHECKING is not supported in this VM");
2647 #else
2648 CheckJNICalls = true;
2649 #endif // INCLUDE_JNI_CHECK
2650 } else if (is_bad_option(option, args->ignoreUnrecognized,
2651 "check")) {
2652 return JNI_EINVAL;
2653 }
2654 } else if (match_option(option, "vfprintf")) {
2655 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2656 } else if (match_option(option, "exit")) {
2657 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2658 } else if (match_option(option, "abort")) {
2659 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2660 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2661 // and the last option wins.
2662 } else if (match_option(option, "-XX:+NeverTenure")) {
2663 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2673 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2683 uint max_tenuring_thresh = 0;
2684 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2685 jio_fprintf(defaultStream::error_stream(),
2686 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2687 return JNI_EINVAL;
2688 }
2689
2690 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2691 return JNI_EINVAL;
2692 }
2693
2694 if (MaxTenuringThreshold == 0) {
2695 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 } else {
2702 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2703 return JNI_EINVAL;
2704 }
2705 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 }
2709 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2710 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2714 return JNI_EINVAL;
2715 }
2716 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2717 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2724 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2731 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 } else if (match_option(option, "--finalization=", &tail)) {
2738 if (strcmp(tail, "enabled") == 0) {
2739 InstanceKlass::set_finalization_enabled(true);
2740 } else if (strcmp(tail, "disabled") == 0) {
2741 InstanceKlass::set_finalization_enabled(false);
2742 } else {
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2745 tail);
2746 return JNI_EINVAL;
2747 }
2748 #if !defined(DTRACE_ENABLED)
2749 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "DTraceMethodProbes flag is not applicable for this configuration\n");
2752 return JNI_EINVAL;
2753 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2754 jio_fprintf(defaultStream::error_stream(),
2755 "DTraceAllocProbes flag is not applicable for this configuration\n");
2756 return JNI_EINVAL;
2757 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2758 jio_fprintf(defaultStream::error_stream(),
2759 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2760 return JNI_EINVAL;
2761 #endif // !defined(DTRACE_ENABLED)
2762 #ifdef ASSERT
2763 } else if (match_option(option, "-XX:+FullGCALot")) {
2764 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2765 return JNI_EINVAL;
2766 }
2767 #endif
2768 #if !INCLUDE_MANAGEMENT
2769 } else if (match_option(option, "-XX:+ManagementServer")) {
2770 jio_fprintf(defaultStream::error_stream(),
2771 "ManagementServer is not supported in this VM.\n");
2772 return JNI_ERR;
2773 #endif // INCLUDE_MANAGEMENT
2774 #if INCLUDE_JVMCI
2775 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2776 if (EnableJVMCIProduct) {
2777 jio_fprintf(defaultStream::error_stream(),
2778 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2779 return JNI_EINVAL;
2780 }
2781 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2782 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2783 if (use_graal_jit) {
2784 const char* jvmci_compiler = get_property("jvmci.Compiler");
2785 if (jvmci_compiler != nullptr) {
2786 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2787 jio_fprintf(defaultStream::error_stream(),
2788 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2789 return JNI_ERR;
2790 }
2791 } else if (!add_property("jvmci.Compiler=graal")) {
2792 return JNI_ENOMEM;
2793 }
2794 }
2795
2796 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2797 if (EnableJVMCIProduct) {
2798 continue;
2799 }
2800 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2801 // Allow this flag if it has been unlocked.
2802 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2803 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2804 jio_fprintf(defaultStream::error_stream(),
2805 "Unable to enable JVMCI in product mode\n");
2806 return JNI_ERR;
2807 }
2808 }
2809 // The flag was locked so process normally to report that error
2810 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2811 return JNI_EINVAL;
2812 }
2813 #endif // INCLUDE_JVMCI
2814 #if INCLUDE_JFR
2815 } else if (match_jfr_option(&option)) {
2816 return JNI_EINVAL;
2817 #endif
2818 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2819 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2820 // already been handled
2821 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2822 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2823 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2824 return JNI_EINVAL;
2825 }
2826 }
2827 // Unknown option
2828 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2829 return JNI_ERR;
2830 }
2831 }
2832
2833 // PrintSharedArchiveAndExit will turn on
2834 // -Xshare:on
2835 // -Xlog:class+path=info
2836 if (PrintSharedArchiveAndExit) {
2837 UseSharedSpaces = true;
2838 RequireSharedSpaces = true;
2839 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2840 }
2841
2842 fix_appclasspath();
2843
2844 return JNI_OK;
2845 }
2846
2847 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2848 // For java.base check for duplicate --patch-module options being specified on the command line.
2849 // This check is only required for java.base, all other duplicate module specifications
2850 // will be checked during module system initialization. The module system initialization
2851 // will throw an ExceptionInInitializerError if this situation occurs.
2852 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2853 if (patch_mod_javabase) {
2854 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2855 } else {
2856 patch_mod_javabase = true;
2857 }
2858 }
2859
2860 // Create GrowableArray lazily, only if --patch-module has been specified
2861 if (_patch_mod_prefix == nullptr) {
2862 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2863 }
2864
2865 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2866 }
2867
2868 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2869 //
2870 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2871 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2872 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2873 // path is treated as the current directory.
2874 //
2875 // This causes problems with CDS, which requires that all directories specified in the classpath
2876 // must be empty. In most cases, applications do NOT want to load classes from the current
2877 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2878 // scripts compatible with CDS.
2879 void Arguments::fix_appclasspath() {
2880 if (IgnoreEmptyClassPaths) {
2881 const char separator = *os::path_separator();
2882 const char* src = _java_class_path->value();
2883
2884 // skip over all the leading empty paths
2885 while (*src == separator) {
2886 src ++;
2887 }
2888
2889 char* copy = os::strdup_check_oom(src, mtArguments);
2890
2891 // trim all trailing empty paths
2892 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2893 *tail = '\0';
2894 }
2895
2896 char from[3] = {separator, separator, '\0'};
2897 char to [2] = {separator, '\0'};
2898 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2899 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2900 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2901 }
2902
2903 _java_class_path->set_writeable_value(copy);
2904 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2905 }
2906 }
2907
2908 jint Arguments::finalize_vm_init_args() {
2909 // check if the default lib/endorsed directory exists; if so, error
2910 char path[JVM_MAXPATHLEN];
2911 const char* fileSep = os::file_separator();
2912 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2913
2914 DIR* dir = os::opendir(path);
2915 if (dir != nullptr) {
2916 jio_fprintf(defaultStream::output_stream(),
2917 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2918 "in modular form will be supported via the concept of upgradeable modules.\n");
2919 os::closedir(dir);
2920 return JNI_ERR;
2921 }
2922
2923 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2924 dir = os::opendir(path);
2925 if (dir != nullptr) {
2926 jio_fprintf(defaultStream::output_stream(),
2927 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2928 "Use -classpath instead.\n.");
2929 os::closedir(dir);
2930 return JNI_ERR;
2931 }
2932
2933 // This must be done after all arguments have been processed
2934 // and the container support has been initialized since AggressiveHeap
2935 // relies on the amount of total memory available.
2936 if (AggressiveHeap) {
2937 jint result = set_aggressive_heap_flags();
2938 if (result != JNI_OK) {
2939 return result;
2940 }
2941 }
2942
2943 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2944 // but like -Xint, leave compilation thresholds unaffected.
2945 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2946 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2947 set_mode_flags(_int);
2948 }
2949
2950 #ifdef ZERO
2951 // Zero always runs in interpreted mode
2952 set_mode_flags(_int);
2953 #endif
2954
2955 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2956 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2957 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2958 }
2959
2960 #if !COMPILER2_OR_JVMCI
2961 // Don't degrade server performance for footprint
2962 if (FLAG_IS_DEFAULT(UseLargePages) &&
2963 MaxHeapSize < LargePageHeapSizeThreshold) {
2964 // No need for large granularity pages w/small heaps.
2965 // Note that large pages are enabled/disabled for both the
2966 // Java heap and the code cache.
2967 FLAG_SET_DEFAULT(UseLargePages, false);
2968 }
2969
2970 UNSUPPORTED_OPTION(ProfileInterpreter);
2971 #endif
2972
2973 // Parse the CompilationMode flag
2974 if (!CompilationModeFlag::initialize()) {
2975 return JNI_ERR;
2976 }
2977
2978 if (!check_vm_args_consistency()) {
2979 return JNI_ERR;
2980 }
2981
2982 if (StoreCachedCode) {
2983 FLAG_SET_ERGO_IF_DEFAULT(CachedCodeMaxSize, 512*M);
2984 }
2985
2986 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2987 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2988 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2989
2990 return JNI_OK;
2991 }
2992
2993 // Helper class for controlling the lifetime of JavaVMInitArgs
2994 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2995 // deleted on the destruction of the ScopedVMInitArgs object.
2996 class ScopedVMInitArgs : public StackObj {
2997 private:
2998 JavaVMInitArgs _args;
2999 char* _container_name;
3000 bool _is_set;
3001 char* _vm_options_file_arg;
3002
3003 public:
3004 ScopedVMInitArgs(const char *container_name) {
3005 _args.version = JNI_VERSION_1_2;
3006 _args.nOptions = 0;
3007 _args.options = nullptr;
3008 _args.ignoreUnrecognized = false;
3009 _container_name = (char *)container_name;
3010 _is_set = false;
3011 _vm_options_file_arg = nullptr;
3012 }
3013
3014 // Populates the JavaVMInitArgs object represented by this
3015 // ScopedVMInitArgs object with the arguments in options. The
3016 // allocated memory is deleted by the destructor. If this method
3017 // returns anything other than JNI_OK, then this object is in a
3018 // partially constructed state, and should be abandoned.
3019 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3020 _is_set = true;
3021 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3022 JavaVMOption, options->length(), mtArguments);
3023 if (options_arr == nullptr) {
3024 return JNI_ENOMEM;
3025 }
3026 _args.options = options_arr;
3027
3028 for (int i = 0; i < options->length(); i++) {
3029 options_arr[i] = options->at(i);
3030 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3031 if (options_arr[i].optionString == nullptr) {
3032 // Rely on the destructor to do cleanup.
3033 _args.nOptions = i;
3034 return JNI_ENOMEM;
3035 }
3036 }
3037
3038 _args.nOptions = options->length();
3039 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3040 return JNI_OK;
3041 }
3042
3043 JavaVMInitArgs* get() { return &_args; }
3044 char* container_name() { return _container_name; }
3045 bool is_set() { return _is_set; }
3046 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3047 char* vm_options_file_arg() { return _vm_options_file_arg; }
3048
3049 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3050 if (_vm_options_file_arg != nullptr) {
3051 os::free(_vm_options_file_arg);
3052 }
3053 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3054 }
3055
3056 ~ScopedVMInitArgs() {
3057 if (_vm_options_file_arg != nullptr) {
3058 os::free(_vm_options_file_arg);
3059 }
3060 if (_args.options == nullptr) return;
3061 for (int i = 0; i < _args.nOptions; i++) {
3062 os::free(_args.options[i].optionString);
3063 }
3064 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3065 }
3066
3067 // Insert options into this option list, to replace option at
3068 // vm_options_file_pos (-XX:VMOptionsFile)
3069 jint insert(const JavaVMInitArgs* args,
3070 const JavaVMInitArgs* args_to_insert,
3071 const int vm_options_file_pos) {
3072 assert(_args.options == nullptr, "shouldn't be set yet");
3073 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3074 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3075
3076 int length = args->nOptions + args_to_insert->nOptions - 1;
3077 // Construct new option array
3078 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3079 for (int i = 0; i < args->nOptions; i++) {
3080 if (i == vm_options_file_pos) {
3081 // insert the new options starting at the same place as the
3082 // -XX:VMOptionsFile option
3083 for (int j = 0; j < args_to_insert->nOptions; j++) {
3084 options.push(args_to_insert->options[j]);
3085 }
3086 } else {
3087 options.push(args->options[i]);
3088 }
3089 }
3090 // make into options array
3091 return set_args(&options);
3092 }
3093 };
3094
3095 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3096 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3097 }
3098
3099 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3100 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3101 }
3102
3103 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3104 for (int index = args->nOptions - 1; index >= 0; index--) {
3105 JavaVMOption* option = args->options + index;
3106 if (strncmp(option->optionString, "-XX:AOTMode=", 12) == 0) {
3107 return option;
3108 }
3109 }
3110
3111 return nullptr;
3112 }
3113
3114 jint Arguments::parse_aot_tool_options_environment_variable(const JavaVMInitArgs* vm_options_args,
3115 const JavaVMInitArgs* java_tool_options_args,
3116 const JavaVMInitArgs* cmd_line_args,
3117 const JavaVMInitArgs* java_options_args,
3118 ScopedVMInitArgs* aot_tool_options_args) {
3119 // Don't bother scanning all the args if this env variable is not set
3120 if (::getenv("AOT_TOOL_OPTIONS") == nullptr) {
3121 return JNI_OK;
3122 }
3123
3124 // The JavaVMInitArgs will be parsed by parse_vm_init_args() in the order of the
3125 // parameters to this function, so let's look backwards and find the last occurrence
3126 // of -XX:AOTMode=xxx, which will decide the value of AOTMode.
3127 JavaVMOption* option;
3128 if ((option = get_last_aotmode_arg(java_options_args)) != nullptr ||
3129 (option = get_last_aotmode_arg(cmd_line_args)) != nullptr ||
3130 (option = get_last_aotmode_arg(java_tool_options_args)) != nullptr ||
3131 (option = get_last_aotmode_arg(vm_options_args)) != nullptr) {
3132 // We have found the last -XX:AOTMode=xxx in the above 4 set of args. At this point
3133 // <option> has NOT been parsed yet, so its value is not reflected inside the global
3134 // variable AOTMode.
3135 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3136 return JNI_OK; // Do not parse AOT_TOOL_OPTIONS
3137 }
3138 } else {
3139 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3140 // which would have been set inside process_settings_file();
3141 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3142 return JNI_OK; // Do not parse AOT_TOOL_OPTIONS
3143 }
3144 }
3145
3146 return parse_options_environment_variable("AOT_TOOL_OPTIONS", aot_tool_options_args);
3147 }
3148
3149 jint Arguments::parse_options_environment_variable(const char* name,
3150 ScopedVMInitArgs* vm_args) {
3151 char *buffer = ::getenv(name);
3152
3153 // Don't check this environment variable if user has special privileges
3154 // (e.g. unix su command).
3155 if (buffer == nullptr || os::have_special_privileges()) {
3156 return JNI_OK;
3157 }
3158
3159 if ((buffer = os::strdup(buffer)) == nullptr) {
3160 return JNI_ENOMEM;
3161 }
3162
3163 jio_fprintf(defaultStream::error_stream(),
3164 "Picked up %s: %s\n", name, buffer);
3165
3166 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3167
3168 os::free(buffer);
3169 return retcode;
3170 }
3171
3172 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3173 // read file into buffer
3174 int fd = ::open(file_name, O_RDONLY);
3175 if (fd < 0) {
3176 jio_fprintf(defaultStream::error_stream(),
3177 "Could not open options file '%s'\n",
3178 file_name);
3179 return JNI_ERR;
3180 }
3181
3182 struct stat stbuf;
3183 int retcode = os::stat(file_name, &stbuf);
3184 if (retcode != 0) {
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Could not stat options file '%s'\n",
3187 file_name);
3188 ::close(fd);
3189 return JNI_ERR;
3190 }
3191
3192 if (stbuf.st_size == 0) {
3193 // tell caller there is no option data and that is ok
3194 ::close(fd);
3195 return JNI_OK;
3196 }
3197
3198 // '+ 1' for null termination even with max bytes
3199 size_t bytes_alloc = stbuf.st_size + 1;
3200
3201 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3202 if (nullptr == buf) {
3203 jio_fprintf(defaultStream::error_stream(),
3204 "Could not allocate read buffer for options file parse\n");
3205 ::close(fd);
3206 return JNI_ENOMEM;
3207 }
3208
3209 memset(buf, 0, bytes_alloc);
3210
3211 // Fill buffer
3212 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3213 ::close(fd);
3214 if (bytes_read < 0) {
3215 FREE_C_HEAP_ARRAY(char, buf);
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Could not read options file '%s'\n", file_name);
3218 return JNI_ERR;
3219 }
3220
3221 if (bytes_read == 0) {
3222 // tell caller there is no option data and that is ok
3223 FREE_C_HEAP_ARRAY(char, buf);
3224 return JNI_OK;
3225 }
3226
3227 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3228
3229 FREE_C_HEAP_ARRAY(char, buf);
3230 return retcode;
3231 }
3232
3233 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3234 // Construct option array
3235 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3236
3237 // some pointers to help with parsing
3238 char *buffer_end = buffer + buf_len;
3239 char *opt_hd = buffer;
3240 char *wrt = buffer;
3241 char *rd = buffer;
3242
3243 // parse all options
3244 while (rd < buffer_end) {
3245 // skip leading white space from the input string
3246 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3247 rd++;
3248 }
3249
3250 if (rd >= buffer_end) {
3251 break;
3252 }
3253
3254 // Remember this is where we found the head of the token.
3255 opt_hd = wrt;
3256
3257 // Tokens are strings of non white space characters separated
3258 // by one or more white spaces.
3259 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3260 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3261 int quote = *rd; // matching quote to look for
3262 rd++; // don't copy open quote
3263 while (rd < buffer_end && *rd != quote) {
3264 // include everything (even spaces)
3265 // up until the close quote
3266 *wrt++ = *rd++; // copy to option string
3267 }
3268
3269 if (rd < buffer_end) {
3270 rd++; // don't copy close quote
3271 } else {
3272 // did not see closing quote
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Unmatched quote in %s\n", name);
3275 return JNI_ERR;
3276 }
3277 } else {
3278 *wrt++ = *rd++; // copy to option string
3279 }
3280 }
3281
3282 // steal a white space character and set it to null
3283 *wrt++ = '\0';
3284 // We now have a complete token
3285
3286 JavaVMOption option;
3287 option.optionString = opt_hd;
3288 option.extraInfo = nullptr;
3289
3290 options.append(option); // Fill in option
3291
3292 rd++; // Advance to next character
3293 }
3294
3295 // Fill out JavaVMInitArgs structure.
3296 return vm_args->set_args(&options);
3297 }
3298
3299 #ifndef PRODUCT
3300 // Determine whether LogVMOutput should be implicitly turned on.
3301 static bool use_vm_log() {
3302 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3303 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3304 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3305 PrintAssembly || TraceDeoptimization ||
3306 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3307 return true;
3308 }
3309
3310 #ifdef COMPILER1
3311 if (PrintC1Statistics) {
3312 return true;
3313 }
3314 #endif // COMPILER1
3315
3316 #ifdef COMPILER2
3317 if (PrintOptoAssembly || PrintOptoStatistics) {
3318 return true;
3319 }
3320 #endif // COMPILER2
3321
3322 return false;
3323 }
3324
3325 #endif // PRODUCT
3326
3327 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3328 for (int index = 0; index < args->nOptions; index++) {
3329 const JavaVMOption* option = args->options + index;
3330 const char* tail;
3331 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3332 return true;
3333 }
3334 }
3335 return false;
3336 }
3337
3338 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3339 const char* vm_options_file,
3340 const int vm_options_file_pos,
3341 ScopedVMInitArgs* vm_options_file_args,
3342 ScopedVMInitArgs* args_out) {
3343 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3344 if (code != JNI_OK) {
3345 return code;
3346 }
3347
3348 if (vm_options_file_args->get()->nOptions < 1) {
3349 return JNI_OK;
3350 }
3351
3352 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3353 jio_fprintf(defaultStream::error_stream(),
3354 "A VM options file may not refer to a VM options file. "
3355 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3356 "options file '%s' in options container '%s' is an error.\n",
3357 vm_options_file_args->vm_options_file_arg(),
3358 vm_options_file_args->container_name());
3359 return JNI_EINVAL;
3360 }
3361
3362 return args_out->insert(args, vm_options_file_args->get(),
3363 vm_options_file_pos);
3364 }
3365
3366 // Expand -XX:VMOptionsFile found in args_in as needed.
3367 // mod_args and args_out parameters may return values as needed.
3368 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3369 ScopedVMInitArgs* mod_args,
3370 JavaVMInitArgs** args_out) {
3371 jint code = match_special_option_and_act(args_in, mod_args);
3372 if (code != JNI_OK) {
3373 return code;
3374 }
3375
3376 if (mod_args->is_set()) {
3377 // args_in contains -XX:VMOptionsFile and mod_args contains the
3378 // original options from args_in along with the options expanded
3379 // from the VMOptionsFile. Return a short-hand to the caller.
3380 *args_out = mod_args->get();
3381 } else {
3382 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3383 }
3384 return JNI_OK;
3385 }
3386
3387 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3388 ScopedVMInitArgs* args_out) {
3389 // Remaining part of option string
3390 const char* tail;
3391 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3392
3393 for (int index = 0; index < args->nOptions; index++) {
3394 const JavaVMOption* option = args->options + index;
3395 if (match_option(option, "-XX:Flags=", &tail)) {
3396 Arguments::set_jvm_flags_file(tail);
3397 continue;
3398 }
3399 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3400 if (vm_options_file_args.found_vm_options_file_arg()) {
3401 jio_fprintf(defaultStream::error_stream(),
3402 "The option '%s' is already specified in the options "
3403 "container '%s' so the specification of '%s' in the "
3404 "same options container is an error.\n",
3405 vm_options_file_args.vm_options_file_arg(),
3406 vm_options_file_args.container_name(),
3407 option->optionString);
3408 return JNI_EINVAL;
3409 }
3410 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3411 // If there's a VMOptionsFile, parse that
3412 jint code = insert_vm_options_file(args, tail, index,
3413 &vm_options_file_args, args_out);
3414 if (code != JNI_OK) {
3415 return code;
3416 }
3417 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3418 if (args_out->is_set()) {
3419 // The VMOptions file inserted some options so switch 'args'
3420 // to the new set of options, and continue processing which
3421 // preserves "last option wins" semantics.
3422 args = args_out->get();
3423 // The first option from the VMOptionsFile replaces the
3424 // current option. So we back track to process the
3425 // replacement option.
3426 index--;
3427 }
3428 continue;
3429 }
3430 if (match_option(option, "-XX:+PrintVMOptions")) {
3431 PrintVMOptions = true;
3432 continue;
3433 }
3434 if (match_option(option, "-XX:-PrintVMOptions")) {
3435 PrintVMOptions = false;
3436 continue;
3437 }
3438 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3439 IgnoreUnrecognizedVMOptions = true;
3440 continue;
3441 }
3442 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3443 IgnoreUnrecognizedVMOptions = false;
3444 continue;
3445 }
3446 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3447 JVMFlag::printFlags(tty, false);
3448 vm_exit(0);
3449 }
3450
3451 #ifndef PRODUCT
3452 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3453 JVMFlag::printFlags(tty, true);
3454 vm_exit(0);
3455 }
3456 #endif
3457 }
3458 return JNI_OK;
3459 }
3460
3461 static void print_options(const JavaVMInitArgs *args) {
3462 const char* tail;
3463 for (int index = 0; index < args->nOptions; index++) {
3464 const JavaVMOption *option = args->options + index;
3465 if (match_option(option, "-XX:", &tail)) {
3466 logOption(tail);
3467 }
3468 }
3469 }
3470
3471 bool Arguments::handle_deprecated_print_gc_flags() {
3472 if (PrintGC) {
3473 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3474 }
3475 if (PrintGCDetails) {
3476 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3477 }
3478
3479 if (_legacyGCLogging.lastFlag == 2) {
3480 // -Xloggc was used to specify a filename
3481 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3482
3483 LogTarget(Error, logging) target;
3484 LogStream errstream(target);
3485 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3486 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3487 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3488 }
3489 return true;
3490 }
3491
3492 static void apply_debugger_ergo() {
3493 #ifdef ASSERT
3494 if (ReplayCompiles) {
3495 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3496 }
3497
3498 if (UseDebuggerErgo) {
3499 // Turn on sub-flags
3500 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3501 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3502 }
3503
3504 if (UseDebuggerErgo2) {
3505 // Debugging with limited number of CPUs
3506 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3507 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3508 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3509 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3510 }
3511 #endif // ASSERT
3512 }
3513
3514 // Parse entry point called from JNI_CreateJavaVM
3515
3516 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3517 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3518 JVMFlag::check_all_flag_declarations();
3519
3520 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3521 const char* hotspotrc = ".hotspotrc";
3522 bool settings_file_specified = false;
3523 bool needs_hotspotrc_warning = false;
3524 ScopedVMInitArgs initial_vm_options_args("");
3525 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3526 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3527 ScopedVMInitArgs initial_aot_tool_options_args("env_var='AOT_TOOL_OPTIONS'");
3528
3529 // Pointers to current working set of containers
3530 JavaVMInitArgs* cur_cmd_args;
3531 JavaVMInitArgs* cur_vm_options_args;
3532 JavaVMInitArgs* cur_java_options_args;
3533 JavaVMInitArgs* cur_java_tool_options_args;
3534 JavaVMInitArgs* cur_aot_tool_options_args;
3535
3536 // Containers for modified/expanded options
3537 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3538 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3539 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3540 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3541 ScopedVMInitArgs mod_aot_tool_options_args("env_var='_AOT_TOOL_OPTIONS'");
3542
3543 jint code =
3544 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3545 if (code != JNI_OK) {
3546 return code;
3547 }
3548
3549 code = parse_java_options_environment_variable(&initial_java_options_args);
3550 if (code != JNI_OK) {
3551 return code;
3552 }
3553
3554 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3555 char *vmoptions = ClassLoader::lookup_vm_options();
3556 if (vmoptions != nullptr) {
3557 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3558 FREE_C_HEAP_ARRAY(char, vmoptions);
3559 if (code != JNI_OK) {
3560 return code;
3561 }
3562 }
3563
3564 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3565 &mod_java_tool_options_args,
3566 &cur_java_tool_options_args);
3567 if (code != JNI_OK) {
3568 return code;
3569 }
3570
3571 code = expand_vm_options_as_needed(initial_cmd_args,
3572 &mod_cmd_args,
3573 &cur_cmd_args);
3574 if (code != JNI_OK) {
3575 return code;
3576 }
3577
3578 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3579 &mod_java_options_args,
3580 &cur_java_options_args);
3581 if (code != JNI_OK) {
3582 return code;
3583 }
3584
3585 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3586 &mod_vm_options_args,
3587 &cur_vm_options_args);
3588 if (code != JNI_OK) {
3589 return code;
3590 }
3591
3592 const char* flags_file = Arguments::get_jvm_flags_file();
3593 settings_file_specified = (flags_file != nullptr);
3594
3595 if (IgnoreUnrecognizedVMOptions) {
3596 cur_cmd_args->ignoreUnrecognized = true;
3597 cur_java_tool_options_args->ignoreUnrecognized = true;
3598 cur_java_options_args->ignoreUnrecognized = true;
3599 }
3600
3601 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3602 if (settings_file_specified) {
3603 if (!process_settings_file(flags_file, true,
3604 cur_cmd_args->ignoreUnrecognized)) {
3605 return JNI_EINVAL;
3606 }
3607 } else {
3608 #ifdef ASSERT
3609 // Parse default .hotspotrc settings file
3610 if (!process_settings_file(".hotspotrc", false,
3611 cur_cmd_args->ignoreUnrecognized)) {
3612 return JNI_EINVAL;
3613 }
3614 #else
3615 struct stat buf;
3616 if (os::stat(hotspotrc, &buf) == 0) {
3617 needs_hotspotrc_warning = true;
3618 }
3619 #endif
3620 }
3621
3622 // AOT_TOOL_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3623 // the options that have been gathered above.
3624 code = parse_aot_tool_options_environment_variable(cur_vm_options_args,
3625 cur_java_tool_options_args,
3626 cur_cmd_args,
3627 cur_java_options_args,
3628 &initial_aot_tool_options_args);
3629 if (code != JNI_OK) {
3630 return code;
3631 }
3632 code = expand_vm_options_as_needed(initial_aot_tool_options_args.get(),
3633 &mod_aot_tool_options_args,
3634 &cur_aot_tool_options_args);
3635 if (code != JNI_OK) {
3636 return code;
3637 }
3638
3639
3640 if (PrintVMOptions) {
3641 print_options(cur_java_tool_options_args);
3642 print_options(cur_cmd_args);
3643 print_options(cur_java_options_args);
3644 print_options(cur_aot_tool_options_args);
3645 }
3646
3647 // Apply the settings in these args into the JVM global flags, in the order
3648 // of the parameters to parse_vm_init_args()
3649 jint result = parse_vm_init_args(cur_vm_options_args,
3650 cur_java_tool_options_args,
3651 cur_cmd_args,
3652 cur_java_options_args,
3653 cur_aot_tool_options_args);
3654
3655 if (result != JNI_OK) {
3656 return result;
3657 }
3658
3659 // Delay warning until here so that we've had a chance to process
3660 // the -XX:-PrintWarnings flag
3661 if (needs_hotspotrc_warning) {
3662 warning("%s file is present but has been ignored. "
3663 "Run with -XX:Flags=%s to load the file.",
3664 hotspotrc, hotspotrc);
3665 }
3666
3667 if (needs_module_property_warning) {
3668 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3669 " names that are reserved for internal use.");
3670 }
3671
3672 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3673 UNSUPPORTED_OPTION(UseLargePages);
3674 #endif
3675
3676 #if defined(AIX)
3677 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3678 #endif
3679
3680 #ifndef PRODUCT
3681 if (TraceBytecodesAt != 0) {
3682 TraceBytecodes = true;
3683 }
3684 #endif // PRODUCT
3685
3686 if (ScavengeRootsInCode == 0) {
3687 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3688 warning("Forcing ScavengeRootsInCode non-zero");
3689 }
3690 ScavengeRootsInCode = 1;
3691 }
3692
3693 if (!handle_deprecated_print_gc_flags()) {
3694 return JNI_EINVAL;
3695 }
3696
3697 // Set object alignment values.
3698 set_object_alignment();
3699
3700 #if !INCLUDE_CDS
3701 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3702 jio_fprintf(defaultStream::error_stream(),
3703 "Shared spaces are not supported in this VM\n");
3704 return JNI_ERR;
3705 }
3706 if (DumpLoadedClassList != nullptr) {
3707 jio_fprintf(defaultStream::error_stream(),
3708 "DumpLoadedClassList is not supported in this VM\n");
3709 return JNI_ERR;
3710 }
3711 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3712 log_is_enabled(Info, cds)) {
3713 warning("Shared spaces are not supported in this VM");
3714 UseSharedSpaces = false;
3715 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3716 }
3717 no_shared_spaces("CDS Disabled");
3718 #endif // INCLUDE_CDS
3719
3720 // Verify NMT arguments
3721 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3722 if (lvl == NMT_unknown) {
3723 jio_fprintf(defaultStream::error_stream(),
3724 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3725 return JNI_ERR;
3726 }
3727 if (PrintNMTStatistics && lvl == NMT_off) {
3728 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3729 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3730 }
3731
3732 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3733 if (trace_dependencies && VerifyDependencies) {
3734 warning("dependency logging results may be inflated by VerifyDependencies");
3735 }
3736
3737 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3738 log_is_enabled(Info, class, load, cause);
3739 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3740 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3741 }
3742
3743 apply_debugger_ergo();
3744
3745 // The VMThread needs to stop now and then to execute these debug options.
3746 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3747 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3748 }
3749
3750 if (log_is_enabled(Info, arguments)) {
3751 LogStream st(Log(arguments)::info());
3752 Arguments::print_on(&st);
3753 }
3754
3755 return JNI_OK;
3756 }
3757
3758 void Arguments::set_compact_headers_flags() {
3759 #ifdef _LP64
3760 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3761 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3762 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3763 }
3764 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3765 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3766 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3767 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3768
3769 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3770 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3771 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3772 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3773 } else {
3774 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3775 }
3776 }
3777 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3778 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3779 }
3780 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3781 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3782 }
3783 #endif
3784 }
3785
3786 jint Arguments::apply_ergo() {
3787 // Set flags based on ergonomics.
3788 jint result = set_ergonomics_flags();
3789 if (result != JNI_OK) return result;
3790
3791 // Set heap size based on available physical memory
3792 set_heap_size();
3793
3794 GCConfig::arguments()->initialize();
3795
3796 set_compact_headers_flags();
3797
3798 if (UseCompressedClassPointers) {
3799 CompressedKlassPointers::pre_initialize();
3800 }
3801
3802 CDSConfig::ergo_initialize();
3803
3804 // Initialize Metaspace flags and alignments
3805 Metaspace::ergo_initialize();
3806
3807 if (!StringDedup::ergo_initialize()) {
3808 return JNI_EINVAL;
3809 }
3810
3811 // Set compiler flags after GC is selected and GC specific
3812 // flags (LoopStripMiningIter) are set.
3813 CompilerConfig::ergo_initialize();
3814
3815 // Set bytecode rewriting flags
3816 set_bytecode_flags();
3817
3818 // Set flags if aggressive optimization flags are enabled
3819 jint code = set_aggressive_opts_flags();
3820 if (code != JNI_OK) {
3821 return code;
3822 }
3823
3824 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3825 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3826 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3827 warning("UseSecondarySupersTable is not supported");
3828 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3829 }
3830 UseSecondarySupersTable = false; // FIXME: Disabled for Leyden. Neet to fix AOTCodeAddressTable::id_for_address()
3831 if (!UseSecondarySupersTable) {
3832 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3833 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3834 }
3835
3836 #ifdef ZERO
3837 // Clear flags not supported on zero.
3838 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3839 #endif // ZERO
3840
3841 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3842 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3843 DebugNonSafepoints = true;
3844 }
3845
3846 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3847 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3848 }
3849
3850 // Treat the odd case where local verification is enabled but remote
3851 // verification is not as if both were enabled.
3852 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3853 log_info(verification)("Turning on remote verification because local verification is on");
3854 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3855 }
3856
3857 #ifndef PRODUCT
3858 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3859 if (use_vm_log()) {
3860 LogVMOutput = true;
3861 }
3862 }
3863 #endif // PRODUCT
3864
3865 if (PrintCommandLineFlags) {
3866 JVMFlag::printSetFlags(tty);
3867 }
3868
3869 #if COMPILER2_OR_JVMCI
3870 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3871 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3872 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3873 }
3874 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3875
3876 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3877 if (!EnableVectorReboxing) {
3878 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3879 } else {
3880 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3881 }
3882 }
3883 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3884
3885 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3886 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3887 }
3888 FLAG_SET_DEFAULT(UseVectorStubs, false);
3889 }
3890 #endif // COMPILER2_OR_JVMCI
3891
3892 #ifdef COMPILER2
3893 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3894 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3895 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3896 }
3897 #endif // COMPILER2
3898
3899 if (log_is_enabled(Info, init)) {
3900 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3901 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3902 }
3903 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3904 // automatically enable -Xlog:perf+class+link
3905 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3906 }
3907 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3908 } else {
3909 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3910 warning("Disabling ProfileVMLocks since logging is turned off.");
3911 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3912 }
3913 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3914 warning("Disabling ProfileVMCalls since logging is turned off.");
3915 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3916 }
3917 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3918 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3919 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3920 }
3921 if (log_is_enabled(Info, perf, class, link)) {
3922 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3923 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3924 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3925 }
3926 }
3927 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3928 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3929 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3930 }
3931 }
3932
3933 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3934 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3935 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3936 }
3937 }
3938 return JNI_OK;
3939 }
3940
3941 jint Arguments::adjust_after_os() {
3942 if (UseNUMA) {
3943 if (UseParallelGC) {
3944 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3945 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3946 }
3947 }
3948 }
3949 return JNI_OK;
3950 }
3951
3952 int Arguments::PropertyList_count(SystemProperty* pl) {
3953 int count = 0;
3954 while(pl != nullptr) {
3955 count++;
3956 pl = pl->next();
3957 }
3958 return count;
3959 }
3960
3961 // Return the number of readable properties.
3962 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3963 int count = 0;
3964 while(pl != nullptr) {
3965 if (pl->readable()) {
3966 count++;
3967 }
3968 pl = pl->next();
3969 }
3970 return count;
3971 }
3972
3973 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3974 assert(key != nullptr, "just checking");
3975 SystemProperty* prop;
3976 for (prop = pl; prop != nullptr; prop = prop->next()) {
3977 if (strcmp(key, prop->key()) == 0) return prop->value();
3978 }
3979 return nullptr;
3980 }
3981
3982 // Return the value of the requested property provided that it is a readable property.
3983 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3984 assert(key != nullptr, "just checking");
3985 SystemProperty* prop;
3986 // Return the property value if the keys match and the property is not internal or
3987 // it's the special internal property "jdk.boot.class.path.append".
3988 for (prop = pl; prop != nullptr; prop = prop->next()) {
3989 if (strcmp(key, prop->key()) == 0) {
3990 if (!prop->internal()) {
3991 return prop->value();
3992 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3993 return prop->value();
3994 } else {
3995 // Property is internal and not jdk.boot.class.path.append so return null.
3996 return nullptr;
3997 }
3998 }
3999 }
4000 return nullptr;
4001 }
4002
4003 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4004 SystemProperty* p = *plist;
4005 if (p == nullptr) {
4006 *plist = new_p;
4007 } else {
4008 while (p->next() != nullptr) {
4009 p = p->next();
4010 }
4011 p->set_next(new_p);
4012 }
4013 }
4014
4015 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4016 bool writeable, bool internal) {
4017 if (plist == nullptr)
4018 return;
4019
4020 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4021 PropertyList_add(plist, new_p);
4022 }
4023
4024 void Arguments::PropertyList_add(SystemProperty *element) {
4025 PropertyList_add(&_system_properties, element);
4026 }
4027
4028 // This add maintains unique property key in the list.
4029 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4030 PropertyAppendable append, PropertyWriteable writeable,
4031 PropertyInternal internal) {
4032 if (plist == nullptr)
4033 return;
4034
4035 // If property key exists and is writeable, then update with new value.
4036 // Trying to update a non-writeable property is silently ignored.
4037 SystemProperty* prop;
4038 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4039 if (strcmp(k, prop->key()) == 0) {
4040 if (append == AppendProperty) {
4041 prop->append_writeable_value(v);
4042 } else {
4043 prop->set_writeable_value(v);
4044 }
4045 return;
4046 }
4047 }
4048
4049 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4050 }
4051
4052 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4053 // Returns true if all of the source pointed by src has been copied over to
4054 // the destination buffer pointed by buf. Otherwise, returns false.
4055 // Notes:
4056 // 1. If the length (buflen) of the destination buffer excluding the
4057 // null terminator character is not long enough for holding the expanded
4058 // pid characters, it also returns false instead of returning the partially
4059 // expanded one.
4060 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4061 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4062 char* buf, size_t buflen) {
4063 const char* p = src;
4064 char* b = buf;
4065 const char* src_end = &src[srclen];
4066 char* buf_end = &buf[buflen - 1];
4067
4068 while (p < src_end && b < buf_end) {
4069 if (*p == '%') {
4070 switch (*(++p)) {
4071 case '%': // "%%" ==> "%"
4072 *b++ = *p++;
4073 break;
4074 case 'p': { // "%p" ==> current process id
4075 // buf_end points to the character before the last character so
4076 // that we could write '\0' to the end of the buffer.
4077 size_t buf_sz = buf_end - b + 1;
4078 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4079
4080 // if jio_snprintf fails or the buffer is not long enough to hold
4081 // the expanded pid, returns false.
4082 if (ret < 0 || ret >= (int)buf_sz) {
4083 return false;
4084 } else {
4085 b += ret;
4086 assert(*b == '\0', "fail in copy_expand_pid");
4087 if (p == src_end && b == buf_end + 1) {
4088 // reach the end of the buffer.
4089 return true;
4090 }
4091 }
4092 p++;
4093 break;
4094 }
4095 default :
4096 *b++ = '%';
4097 }
4098 } else {
4099 *b++ = *p++;
4100 }
4101 }
4102 *b = '\0';
4103 return (p == src_end); // return false if not all of the source was copied
4104 }