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 #include <string.h>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 unsigned int Arguments::_addmods_count = 0;
89 char* Arguments::_java_command = nullptr;
90 SystemProperty* Arguments::_system_properties = nullptr;
91 size_t Arguments::_conservative_max_heap_alignment = 0;
92 Arguments::Mode Arguments::_mode = _mixed;
93 const char* Arguments::_java_vendor_url_bug = nullptr;
94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
95 bool Arguments::_sun_java_launcher_is_altjvm = false;
96
97 // These parameters are reset in method parse_vm_init_args()
98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
100 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
101 bool Arguments::_ClipInlining = ClipInlining;
102 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
103
104 bool Arguments::_enable_preview = false;
105 bool Arguments::_has_jdwp_agent = false;
106
107 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
108
109 // These are not set by the JDK's built-in launchers, but they can be set by
110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
111 // JavaVMOption in jni.h.
112 abort_hook_t Arguments::_abort_hook = nullptr;
113 exit_hook_t Arguments::_exit_hook = nullptr;
114 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
115
116
117 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
118 SystemProperty *Arguments::_java_library_path = nullptr;
119 SystemProperty *Arguments::_java_home = nullptr;
120 SystemProperty *Arguments::_java_class_path = nullptr;
121 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
122 SystemProperty *Arguments::_vm_info = nullptr;
123
124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
125 PathString *Arguments::_boot_class_path = nullptr;
126 bool Arguments::_has_jimage = false;
127
128 char* Arguments::_ext_dirs = nullptr;
129
130 // True if -Xshare:auto option was specified.
131 static bool xshare_auto_cmd_line = false;
132
133 // True if -Xint/-Xmixed/-Xcomp were specified
134 static bool mode_flag_cmd_line = false;
135
136 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
137 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
138 if (new_value == nullptr) {
139 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
140 return false;
141 }
142 if (_value != nullptr) {
143 FreeHeap(_value);
144 }
145 _value = new_value;
146 strcpy(_value, value);
147 return true;
148 }
149
150 void PathString::append_value(const char *value) {
151 char *sp;
152 size_t len = 0;
153 if (value != nullptr) {
154 len = strlen(value);
155 if (_value != nullptr) {
156 len += strlen(_value);
157 }
158 sp = AllocateHeap(len+2, mtArguments);
159 assert(sp != nullptr, "Unable to allocate space for new append path value");
160 if (sp != nullptr) {
161 if (_value != nullptr) {
162 strcpy(sp, _value);
163 strcat(sp, os::path_separator());
164 strcat(sp, value);
165 FreeHeap(_value);
166 } else {
167 strcpy(sp, value);
168 }
169 _value = sp;
170 }
171 }
172 }
173
174 PathString::PathString(const char* value) {
175 if (value == nullptr) {
176 _value = nullptr;
177 } else {
178 _value = AllocateHeap(strlen(value)+1, mtArguments);
179 strcpy(_value, value);
180 }
181 }
182
183 PathString::~PathString() {
184 if (_value != nullptr) {
185 FreeHeap(_value);
186 _value = nullptr;
187 }
188 }
189
190 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
191 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
192 size_t len = strlen(module_name) + 1;
193 _module_name = AllocateHeap(len, mtInternal);
194 strncpy(_module_name, module_name, len); // copy the trailing null
195 _path = new PathString(path);
196 }
197
198 ModulePatchPath::~ModulePatchPath() {
199 if (_module_name != nullptr) {
200 FreeHeap(_module_name);
201 _module_name = nullptr;
202 }
203 if (_path != nullptr) {
204 delete _path;
205 _path = nullptr;
206 }
207 }
208
209 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
210 if (key == nullptr) {
211 _key = nullptr;
212 } else {
213 _key = AllocateHeap(strlen(key)+1, mtArguments);
214 strcpy(_key, key);
215 }
216 _next = nullptr;
217 _internal = internal;
218 _writeable = writeable;
219 }
220
221 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
222 // part of the option string.
223 static bool match_option(const JavaVMOption *option, const char* name,
224 const char** tail) {
225 size_t len = strlen(name);
226 if (strncmp(option->optionString, name, len) == 0) {
227 *tail = option->optionString + len;
228 return true;
229 } else {
230 return false;
231 }
232 }
233
234 // Check if 'option' matches 'name'. No "tail" is allowed.
235 static bool match_option(const JavaVMOption *option, const char* name) {
236 const char* tail = nullptr;
237 bool result = match_option(option, name, &tail);
238 if (tail != nullptr && *tail == '\0') {
239 return result;
240 } else {
241 return false;
242 }
243 }
244
245 // Return true if any of the strings in null-terminated array 'names' matches.
246 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
247 // the option must match exactly.
248 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
249 bool tail_allowed) {
250 for (/* empty */; *names != nullptr; ++names) {
251 if (match_option(option, *names, tail)) {
252 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
253 return true;
254 }
255 }
256 }
257 return false;
258 }
259
260 #if INCLUDE_JFR
261 static bool _has_jfr_option = false; // is using JFR
262
263 // return true on failure
264 static bool match_jfr_option(const JavaVMOption** option) {
265 assert((*option)->optionString != nullptr, "invariant");
266 char* tail = nullptr;
267 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
268 _has_jfr_option = true;
269 return Jfr::on_start_flight_recording_option(option, tail);
270 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_flight_recorder_option(option, tail);
273 }
274 return false;
275 }
276
277 bool Arguments::has_jfr_option() {
278 return _has_jfr_option;
279 }
280 #endif
281
282 static void logOption(const char* opt) {
283 if (PrintVMOptions) {
284 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
285 }
286 }
287
288 bool needs_module_property_warning = false;
289
290 #define MODULE_PROPERTY_PREFIX "jdk.module."
291 #define MODULE_PROPERTY_PREFIX_LEN 11
292 #define ADDEXPORTS "addexports"
293 #define ADDEXPORTS_LEN 10
294 #define ADDREADS "addreads"
295 #define ADDREADS_LEN 8
296 #define ADDOPENS "addopens"
297 #define ADDOPENS_LEN 8
298 #define PATCH "patch"
299 #define PATCH_LEN 5
300 #define ADDMODS "addmods"
301 #define ADDMODS_LEN 7
302 #define LIMITMODS "limitmods"
303 #define LIMITMODS_LEN 9
304 #define PATH "path"
305 #define PATH_LEN 4
306 #define UPGRADE_PATH "upgrade.path"
307 #define UPGRADE_PATH_LEN 12
308 #define ENABLE_NATIVE_ACCESS "enable.native.access"
309 #define ENABLE_NATIVE_ACCESS_LEN 20
310 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
311 #define ILLEGAL_NATIVE_ACCESS_LEN 21
312
313 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
314 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
315 return ((strncmp(option, property, len) == 0) &&
316 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
317 }
318
319 // Return true if property starts with "jdk.module." and its ensuing chars match
320 // any of the reserved module properties.
321 // property should be passed without the leading "-D".
322 bool Arguments::is_internal_module_property(const char* property) {
323 return internal_module_property_helper(property, false);
324 }
325
326 // Returns true if property is one of those recognized by is_internal_module_property() but
327 // is not supported by CDS archived full module graph.
328 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
329 return internal_module_property_helper(property, true);
330 }
331
332 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
333 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
334 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
335 if (matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
336 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
337 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
338 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
339 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
340 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
341 return true;
342 }
343
344 if (!check_for_cds) {
345 // CDS notes: these properties are supported by CDS archived full module graph.
346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
347 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
348 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
349 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
350 return true;
351 }
352 }
353 }
354 return false;
355 }
356
357 // Process java launcher properties.
358 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
359 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
360 // Must do this before setting up other system properties,
361 // as some of them may depend on launcher type.
362 for (int index = 0; index < args->nOptions; index++) {
363 const JavaVMOption* option = args->options + index;
364 const char* tail;
365
366 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
367 process_java_launcher_argument(tail, option->extraInfo);
368 continue;
369 }
370 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
371 if (strcmp(tail, "true") == 0) {
372 _sun_java_launcher_is_altjvm = true;
373 }
374 continue;
375 }
376 }
377 }
378
379 // Initialize system properties key and value.
380 void Arguments::init_system_properties() {
381
382 // Set up _boot_class_path which is not a property but
383 // relies heavily on argument processing and the jdk.boot.class.path.append
384 // property. It is used to store the underlying boot class path.
385 _boot_class_path = new PathString(nullptr);
386
387 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
388 "Java Virtual Machine Specification", false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
391 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
392
393 // Initialize the vm.info now, but it will need updating after argument parsing.
394 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
395
396 // Following are JVMTI agent writable properties.
397 // Properties values are set to nullptr and they are
398 // os specific they are initialized in os::init_system_properties_values().
399 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
400 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
401 _java_home = new SystemProperty("java.home", nullptr, true);
402 _java_class_path = new SystemProperty("java.class.path", "", true);
403 // jdk.boot.class.path.append is a non-writeable, internal property.
404 // It can only be set by either:
405 // - -Xbootclasspath/a:
406 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
407 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
408
409 // Add to System Property list.
410 PropertyList_add(&_system_properties, _sun_boot_library_path);
411 PropertyList_add(&_system_properties, _java_library_path);
412 PropertyList_add(&_system_properties, _java_home);
413 PropertyList_add(&_system_properties, _java_class_path);
414 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
415 PropertyList_add(&_system_properties, _vm_info);
416
417 // Set OS specific system properties values
418 os::init_system_properties_values();
419 }
420
421 // Update/Initialize System properties after JDK version number is known
422 void Arguments::init_version_specific_system_properties() {
423 enum { bufsz = 16 };
424 char buffer[bufsz];
425 const char* spec_vendor = "Oracle Corporation";
426 uint32_t spec_version = JDK_Version::current().major_version();
427
428 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
429
430 PropertyList_add(&_system_properties,
431 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
432 PropertyList_add(&_system_properties,
433 new SystemProperty("java.vm.specification.version", buffer, false));
434 PropertyList_add(&_system_properties,
435 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
436 }
437
438 /*
439 * -XX argument processing:
440 *
441 * -XX arguments are defined in several places, such as:
442 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
443 * -XX arguments are parsed in parse_argument().
444 * -XX argument bounds checking is done in check_vm_args_consistency().
445 *
446 * Over time -XX arguments may change. There are mechanisms to handle common cases:
447 *
448 * ALIASED: An option that is simply another name for another option. This is often
449 * part of the process of deprecating a flag, but not all aliases need
450 * to be deprecated.
451 *
452 * Create an alias for an option by adding the old and new option names to the
453 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
454 *
455 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
456 * support may be removed in the future. Both regular and aliased options may be
457 * deprecated.
458 *
459 * Add a deprecation warning for an option (or alias) by adding an entry in the
460 * "special_jvm_flags" table and setting the "deprecated_in" field.
461 * Often an option "deprecated" in one major release will
462 * be made "obsolete" in the next. In this case the entry should also have its
463 * "obsolete_in" field set.
464 *
465 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
466 * on the command line. A warning is printed to let the user know that option might not
467 * be accepted in the future.
468 *
469 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
470 * table and setting the "obsolete_in" field.
471 *
472 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
473 * to the current JDK version. The system will flatly refuse to admit the existence of
474 * the flag. This allows a flag to die automatically over JDK releases.
475 *
476 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
477 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
478 * - Newly obsolete or expired deprecated options should have their global variable
479 * definitions removed (from globals.hpp, etc) and related implementations removed.
480 *
481 * Recommended approach for removing options:
482 *
483 * To remove options commonly used by customers (e.g. product -XX options), use
484 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
485 *
486 * To remove internal options (e.g. diagnostic, experimental, develop options), use
487 * a 2-step model adding major release numbers to the obsolete and expire columns.
488 *
489 * To change the name of an option, use the alias table as well as a 2-step
490 * model adding major release numbers to the deprecate and expire columns.
491 * Think twice about aliasing commonly used customer options.
492 *
493 * There are times when it is appropriate to leave a future release number as undefined.
494 *
495 * Tests: Aliases should be tested in VMAliasOptions.java.
496 * Deprecated options should be tested in VMDeprecatedOptions.java.
497 */
498
499 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
500 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
501 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
502 // the command-line as usual, but will issue a warning.
503 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
504 // the command-line, while issuing a warning and ignoring the flag value.
505 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
506 // existence of the flag.
507 //
508 // MANUAL CLEANUP ON JDK VERSION UPDATES:
509 // This table ensures that the handling of options will update automatically when the JDK
510 // version is incremented, but the source code needs to be cleanup up manually:
511 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
512 // variable should be removed, as well as users of the variable.
513 // - As "deprecated" options age into "obsolete" options, move the entry into the
514 // "Obsolete Flags" section of the table.
515 // - All expired options should be removed from the table.
516 static SpecialFlag const special_jvm_flags[] = {
517 // -------------- Deprecated Flags --------------
518 // --- Non-alias flags - sorted by obsolete_in then expired_in:
519 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
522 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
523 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
524 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
525 #ifdef LINUX
526 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
527 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
528 #endif
529 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
530 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
531 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
532
533 // -------------- Obsolete Flags - sorted by expired_in --------------
534
535 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
536 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
537 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
538
539 #ifdef ASSERT
540 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
541 #endif
542
543 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
544 // These entries will generate build errors. Their purpose is to test the macros.
545 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
546 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
547 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
548 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
549 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
552 #endif
553
554 { nullptr, JDK_Version(0), JDK_Version(0) }
555 };
556
557 // Flags that are aliases for other flags.
558 typedef struct {
559 const char* alias_name;
560 const char* real_name;
561 } AliasedFlag;
562
563 static AliasedFlag const aliased_jvm_flags[] = {
564 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
565 { nullptr, nullptr}
566 };
567
568 // Return true if "v" is less than "other", where "other" may be "undefined".
569 static bool version_less_than(JDK_Version v, JDK_Version other) {
570 assert(!v.is_undefined(), "must be defined");
571 if (!other.is_undefined() && v.compare(other) >= 0) {
572 return false;
573 } else {
574 return true;
575 }
576 }
577
578 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
579 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
580 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
581 flag = special_jvm_flags[i];
582 return true;
583 }
584 }
585 return false;
586 }
587
588 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
589 assert(version != nullptr, "Must provide a version buffer");
590 SpecialFlag flag;
591 if (lookup_special_flag(flag_name, flag)) {
592 if (!flag.obsolete_in.is_undefined()) {
593 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
594 *version = flag.obsolete_in;
595 // This flag may have been marked for obsoletion in this version, but we may not
596 // have actually removed it yet. Rather than ignoring it as soon as we reach
597 // this version we allow some time for the removal to happen. So if the flag
598 // still actually exists we process it as normal, but issue an adjusted warning.
599 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
600 if (real_flag != nullptr) {
601 char version_str[256];
602 version->to_string(version_str, sizeof(version_str));
603 warning("Temporarily processing option %s; support is scheduled for removal in %s",
604 flag_name, version_str);
605 return false;
606 }
607 return true;
608 }
609 }
610 }
611 return false;
612 }
613
614 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
615 assert(version != nullptr, "Must provide a version buffer");
616 SpecialFlag flag;
617 if (lookup_special_flag(flag_name, flag)) {
618 if (!flag.deprecated_in.is_undefined()) {
619 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
620 version_less_than(JDK_Version::current(), flag.expired_in)) {
621 *version = flag.deprecated_in;
622 return 1;
623 } else {
624 return -1;
625 }
626 }
627 }
628 return 0;
629 }
630
631 const char* Arguments::real_flag_name(const char *flag_name) {
632 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
633 const AliasedFlag& flag_status = aliased_jvm_flags[i];
634 if (strcmp(flag_status.alias_name, flag_name) == 0) {
635 return flag_status.real_name;
636 }
637 }
638 return flag_name;
639 }
640
641 #ifdef ASSERT
642 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
643 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
644 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
645 return true;
646 }
647 }
648 return false;
649 }
650
651 // Verifies the correctness of the entries in the special_jvm_flags table.
652 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
653 // version being earlier than the deprecation version, then a warning is issued
654 // and verification fails - by returning false. If it is detected that the table
655 // is out of date, with respect to the current version, then ideally a warning is
656 // issued but verification does not fail. This allows the VM to operate when the
657 // version is first updated, without needing to update all the impacted flags at
658 // the same time. In practice we can't issue the warning immediately when the version
659 // is updated as it occurs for every test and some tests are not prepared to handle
660 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
661 // if the check_globals flag is true, and in addition allow a grace period and only
662 // check for stale flags when we hit build 25 (which is far enough into the 6 month
663 // release cycle that all flag updates should have been processed, whilst still
664 // leaving time to make the change before RDP2).
665 // We use a gtest to call this, passing true, so that we can detect stale flags before
666 // the end of the release cycle.
667
668 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
669
670 bool Arguments::verify_special_jvm_flags(bool check_globals) {
671 bool success = true;
672 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
673 const SpecialFlag& flag = special_jvm_flags[i];
674 if (lookup_special_flag(flag.name, i)) {
675 warning("Duplicate special flag declaration \"%s\"", flag.name);
676 success = false;
677 }
678 if (flag.deprecated_in.is_undefined() &&
679 flag.obsolete_in.is_undefined()) {
680 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
681 success = false;
682 }
683
684 if (!flag.deprecated_in.is_undefined()) {
685 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
686 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
687 success = false;
688 }
689
690 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
691 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
692 success = false;
693 }
694 }
695
696 if (!flag.obsolete_in.is_undefined()) {
697 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
698 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
699 success = false;
700 }
701
702 // if flag has become obsolete it should not have a "globals" flag defined anymore.
703 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
704 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
705 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
706 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
707 success = false;
708 }
709 }
710
711 } else if (!flag.expired_in.is_undefined()) {
712 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
713 success = false;
714 }
715
716 if (!flag.expired_in.is_undefined()) {
717 // if flag has become expired it should not have a "globals" flag defined anymore.
718 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
719 !version_less_than(JDK_Version::current(), flag.expired_in)) {
720 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
721 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
722 success = false;
723 }
724 }
725 }
726 }
727 return success;
728 }
729 #endif
730
731 bool Arguments::atojulong(const char *s, julong* result) {
732 return parse_integer(s, result);
733 }
734
735 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
736 if (size < min_size) return arg_too_small;
737 if (size > max_size) return arg_too_big;
738 return arg_in_range;
739 }
740
741 // Describe an argument out of range error
742 void Arguments::describe_range_error(ArgsRange errcode) {
743 switch(errcode) {
744 case arg_too_big:
745 jio_fprintf(defaultStream::error_stream(),
746 "The specified size exceeds the maximum "
747 "representable size.\n");
748 break;
749 case arg_too_small:
750 case arg_unreadable:
751 case arg_in_range:
752 // do nothing for now
753 break;
754 default:
755 ShouldNotReachHere();
756 }
757 }
758
759 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
760 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
761 return true;
762 } else {
763 return false;
764 }
765 }
766
767 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
768 // strtod allows leading whitespace, but our flag format does not.
769 if (*value == '\0' || isspace((unsigned char) *value)) {
770 return false;
771 }
772 char* end;
773 errno = 0;
774 double v = strtod(value, &end);
775 if ((errno != 0) || (*end != 0)) {
776 return false;
777 }
778 if (g_isnan(v) || !g_isfinite(v)) {
779 // Currently we cannot handle these special values.
780 return false;
781 }
782
783 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
784 return true;
785 }
786 return false;
787 }
788
789 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
790 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
791
792 if (flag->is_int()) {
793 int v;
794 if (parse_integer(value, &v)) {
795 result = JVMFlagAccess::set_int(flag, &v, origin);
796 }
797 } else if (flag->is_uint()) {
798 uint v;
799 if (parse_integer(value, &v)) {
800 result = JVMFlagAccess::set_uint(flag, &v, origin);
801 }
802 } else if (flag->is_intx()) {
803 intx v;
804 if (parse_integer(value, &v)) {
805 result = JVMFlagAccess::set_intx(flag, &v, origin);
806 }
807 } else if (flag->is_uintx()) {
808 uintx v;
809 if (parse_integer(value, &v)) {
810 result = JVMFlagAccess::set_uintx(flag, &v, origin);
811 }
812 } else if (flag->is_uint64_t()) {
813 uint64_t v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
816 }
817 } else if (flag->is_size_t()) {
818 size_t v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_size_t(flag, &v, origin);
821 }
822 }
823
824 return result == JVMFlag::SUCCESS;
825 }
826
827 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
828 if (value[0] == '\0') {
829 value = nullptr;
830 }
831 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
832 // Contract: JVMFlag always returns a pointer that needs freeing.
833 FREE_C_HEAP_ARRAY(char, value);
834 return true;
835 }
836
837 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
838 const char* old_value = "";
839 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
840 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
841 size_t new_len = strlen(new_value);
842 const char* value;
843 char* free_this_too = nullptr;
844 if (old_len == 0) {
845 value = new_value;
846 } else if (new_len == 0) {
847 value = old_value;
848 } else {
849 size_t length = old_len + 1 + new_len + 1;
850 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
851 // each new setting adds another LINE to the switch:
852 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
853 value = buf;
854 free_this_too = buf;
855 }
856 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
857 // JVMFlag always returns a pointer that needs freeing.
858 FREE_C_HEAP_ARRAY(char, value);
859 // JVMFlag made its own copy, so I must delete my own temp. buffer.
860 FREE_C_HEAP_ARRAY(char, free_this_too);
861 return true;
862 }
863
864 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
865 const char* real_name = real_flag_name(arg);
866 JDK_Version since = JDK_Version();
867 switch (is_deprecated_flag(arg, &since)) {
868 case -1: {
869 // Obsolete or expired, so don't process normally,
870 // but allow for an obsolete flag we're still
871 // temporarily allowing.
872 if (!is_obsolete_flag(arg, &since)) {
873 return real_name;
874 }
875 // Note if we're not considered obsolete then we can't be expired either
876 // as obsoletion must come first.
877 return nullptr;
878 }
879 case 0:
880 return real_name;
881 case 1: {
882 char version[256];
883 since.to_string(version, sizeof(version));
884 if (real_name != arg) {
885 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
886 arg, version, real_name);
887 } else {
888 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
889 arg, version);
890 }
891 return real_name;
892 }
893 }
894 ShouldNotReachHere();
895 return nullptr;
896 }
897
898 #define BUFLEN 255
899
900 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
901 char name_copied[BUFLEN+1];
902 if (name[name_length] != 0) {
903 if (name_length > BUFLEN) {
904 return nullptr;
905 } else {
906 strncpy(name_copied, name, name_length);
907 name_copied[name_length] = '\0';
908 name = name_copied;
909 }
910 }
911
912 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
913 if (real_name == nullptr) {
914 return nullptr;
915 }
916 JVMFlag* flag = JVMFlag::find_flag(real_name);
917 return flag;
918 }
919
920 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
921 bool is_bool = false;
922 bool bool_val = false;
923 char c = *arg;
924 if (c == '+' || c == '-') {
925 is_bool = true;
926 bool_val = (c == '+');
927 arg++;
928 }
929
930 const char* name = arg;
931 while (true) {
932 c = *arg;
933 if (isalnum(c) || (c == '_')) {
934 ++arg;
935 } else {
936 break;
937 }
938 }
939
940 size_t name_len = size_t(arg - name);
941 if (name_len == 0) {
942 return false;
943 }
944
945 JVMFlag* flag = find_jvm_flag(name, name_len);
946 if (flag == nullptr) {
947 return false;
948 }
949
950 if (is_bool) {
951 if (*arg != 0) {
952 // Error -- extra characters such as -XX:+BoolFlag=123
953 return false;
954 }
955 return set_bool_flag(flag, bool_val, origin);
956 }
957
958 if (arg[0] == '=') {
959 const char* value = arg + 1;
960 if (flag->is_ccstr()) {
961 if (flag->ccstr_accumulates()) {
962 return append_to_string_flag(flag, value, origin);
963 } else {
964 return set_string_flag(flag, value, origin);
965 }
966 } else if (flag->is_double()) {
967 return set_fp_numeric_flag(flag, value, origin);
968 } else {
969 return set_numeric_flag(flag, value, origin);
970 }
971 }
972
973 if (arg[0] == ':' && arg[1] == '=') {
974 // -XX:Foo:=xxx will reset the string flag to the given value.
975 const char* value = arg + 2;
976 return set_string_flag(flag, value, origin);
977 }
978
979 return false;
980 }
981
982 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
983 assert(bldarray != nullptr, "illegal argument");
984
985 if (arg == nullptr) {
986 return;
987 }
988
989 int new_count = *count + 1;
990
991 // expand the array and add arg to the last element
992 if (*bldarray == nullptr) {
993 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
994 } else {
995 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
996 }
997 (*bldarray)[*count] = os::strdup_check_oom(arg);
998 *count = new_count;
999 }
1000
1001 void Arguments::build_jvm_args(const char* arg) {
1002 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1003 }
1004
1005 void Arguments::build_jvm_flags(const char* arg) {
1006 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1007 }
1008
1009 // utility function to return a string that concatenates all
1010 // strings in a given char** array
1011 const char* Arguments::build_resource_string(char** args, int count) {
1012 if (args == nullptr || count == 0) {
1013 return nullptr;
1014 }
1015 size_t length = 0;
1016 for (int i = 0; i < count; i++) {
1017 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1018 }
1019 char* s = NEW_RESOURCE_ARRAY(char, length);
1020 char* dst = s;
1021 for (int j = 0; j < count; j++) {
1022 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1023 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1024 dst += offset;
1025 length -= offset;
1026 }
1027 return (const char*) s;
1028 }
1029
1030 void Arguments::print_on(outputStream* st) {
1031 st->print_cr("VM Arguments:");
1032 if (num_jvm_flags() > 0) {
1033 st->print("jvm_flags: "); print_jvm_flags_on(st);
1034 st->cr();
1035 }
1036 if (num_jvm_args() > 0) {
1037 st->print("jvm_args: "); print_jvm_args_on(st);
1038 st->cr();
1039 }
1040 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1041 if (_java_class_path != nullptr) {
1042 char* path = _java_class_path->value();
1043 size_t len = strlen(path);
1044 st->print("java_class_path (initial): ");
1045 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1046 if (len == 0) {
1047 st->print_raw_cr("<not set>");
1048 } else {
1049 st->print_raw_cr(path, len);
1050 }
1051 }
1052 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1053 }
1054
1055 void Arguments::print_summary_on(outputStream* st) {
1056 // Print the command line. Environment variables that are helpful for
1057 // reproducing the problem are written later in the hs_err file.
1058 // flags are from setting file
1059 if (num_jvm_flags() > 0) {
1060 st->print_raw("Settings File: ");
1061 print_jvm_flags_on(st);
1062 st->cr();
1063 }
1064 // args are the command line and environment variable arguments.
1065 st->print_raw("Command Line: ");
1066 if (num_jvm_args() > 0) {
1067 print_jvm_args_on(st);
1068 }
1069 // this is the classfile and any arguments to the java program
1070 if (java_command() != nullptr) {
1071 st->print("%s", java_command());
1072 }
1073 st->cr();
1074 }
1075
1076 void Arguments::print_jvm_flags_on(outputStream* st) {
1077 if (_num_jvm_flags > 0) {
1078 for (int i=0; i < _num_jvm_flags; i++) {
1079 st->print("%s ", _jvm_flags_array[i]);
1080 }
1081 }
1082 }
1083
1084 void Arguments::print_jvm_args_on(outputStream* st) {
1085 if (_num_jvm_args > 0) {
1086 for (int i=0; i < _num_jvm_args; i++) {
1087 st->print("%s ", _jvm_args_array[i]);
1088 }
1089 }
1090 }
1091
1092 bool Arguments::process_argument(const char* arg,
1093 jboolean ignore_unrecognized,
1094 JVMFlagOrigin origin) {
1095 JDK_Version since = JDK_Version();
1096
1097 if (parse_argument(arg, origin)) {
1098 return true;
1099 }
1100
1101 // Determine if the flag has '+', '-', or '=' characters.
1102 bool has_plus_minus = (*arg == '+' || *arg == '-');
1103 const char* const argname = has_plus_minus ? arg + 1 : arg;
1104
1105 size_t arg_len;
1106 const char* equal_sign = strchr(argname, '=');
1107 if (equal_sign == nullptr) {
1108 arg_len = strlen(argname);
1109 } else {
1110 arg_len = equal_sign - argname;
1111 }
1112
1113 // Only make the obsolete check for valid arguments.
1114 if (arg_len <= BUFLEN) {
1115 // Construct a string which consists only of the argument name without '+', '-', or '='.
1116 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1117 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1118 if (is_obsolete_flag(stripped_argname, &since)) {
1119 char version[256];
1120 since.to_string(version, sizeof(version));
1121 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1122 return true;
1123 }
1124 }
1125
1126 // For locked flags, report a custom error message if available.
1127 // Otherwise, report the standard unrecognized VM option.
1128 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1129 if (found_flag != nullptr) {
1130 char locked_message_buf[BUFLEN];
1131 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1132 if (strlen(locked_message_buf) != 0) {
1133 #ifdef PRODUCT
1134 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1135 if (ignore_unrecognized && mismatched) {
1136 return true;
1137 }
1138 #endif
1139 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1140 }
1141 if (found_flag->is_bool() && !has_plus_minus) {
1142 jio_fprintf(defaultStream::error_stream(),
1143 "Missing +/- setting for VM option '%s'\n", argname);
1144 } else if (!found_flag->is_bool() && has_plus_minus) {
1145 jio_fprintf(defaultStream::error_stream(),
1146 "Unexpected +/- setting in VM option '%s'\n", argname);
1147 } else {
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Improperly specified VM option '%s'\n", argname);
1150 }
1151 } else {
1152 if (ignore_unrecognized) {
1153 return true;
1154 }
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Unrecognized VM option '%s'\n", argname);
1157 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1158 if (fuzzy_matched != nullptr) {
1159 jio_fprintf(defaultStream::error_stream(),
1160 "Did you mean '%s%s%s'?\n",
1161 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1162 fuzzy_matched->name(),
1163 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1164 }
1165 }
1166
1167 // allow for commandline "commenting out" options like -XX:#+Verbose
1168 return arg[0] == '#';
1169 }
1170
1171 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1172 FILE* stream = os::fopen(file_name, "rb");
1173 if (stream == nullptr) {
1174 if (should_exist) {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Could not open settings file %s\n", file_name);
1177 return false;
1178 } else {
1179 return true;
1180 }
1181 }
1182
1183 char token[1024];
1184 int pos = 0;
1185
1186 bool in_white_space = true;
1187 bool in_comment = false;
1188 bool in_quote = false;
1189 int quote_c = 0;
1190 bool result = true;
1191
1192 int c = getc(stream);
1193 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1194 if (in_white_space) {
1195 if (in_comment) {
1196 if (c == '\n') in_comment = false;
1197 } else {
1198 if (c == '#') in_comment = true;
1199 else if (!isspace((unsigned char) c)) {
1200 in_white_space = false;
1201 token[pos++] = checked_cast<char>(c);
1202 }
1203 }
1204 } else {
1205 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1206 // token ends at newline, or at unquoted whitespace
1207 // this allows a way to include spaces in string-valued options
1208 token[pos] = '\0';
1209 logOption(token);
1210 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1211 build_jvm_flags(token);
1212 pos = 0;
1213 in_white_space = true;
1214 in_quote = false;
1215 } else if (!in_quote && (c == '\'' || c == '"')) {
1216 in_quote = true;
1217 quote_c = c;
1218 } else if (in_quote && (c == quote_c)) {
1219 in_quote = false;
1220 } else {
1221 token[pos++] = checked_cast<char>(c);
1222 }
1223 }
1224 c = getc(stream);
1225 }
1226 if (pos > 0) {
1227 token[pos] = '\0';
1228 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1229 build_jvm_flags(token);
1230 }
1231 fclose(stream);
1232 return result;
1233 }
1234
1235 //=============================================================================================================
1236 // Parsing of properties (-D)
1237
1238 const char* Arguments::get_property(const char* key) {
1239 return PropertyList_get_value(system_properties(), key);
1240 }
1241
1242 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1243 const char* eq = strchr(prop, '=');
1244 const char* key;
1245 const char* value = "";
1246
1247 if (eq == nullptr) {
1248 // property doesn't have a value, thus use passed string
1249 key = prop;
1250 } else {
1251 // property have a value, thus extract it and save to the
1252 // allocated string
1253 size_t key_len = eq - prop;
1254 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1255
1256 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1257 key = tmp_key;
1258
1259 value = &prop[key_len + 1];
1260 }
1261
1262 if (internal == ExternalProperty) {
1263 CDSConfig::check_incompatible_property(key, value);
1264 }
1265
1266 if (strcmp(key, "java.compiler") == 0) {
1267 // we no longer support java.compiler system property, log a warning and let it get
1268 // passed to Java, like any other system property
1269 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1270 // for applications using NONE or empty value, log a more informative message
1271 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1272 } else {
1273 warning("The java.compiler system property is obsolete and no longer supported.");
1274 }
1275 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1276 // sun.java.launcher.is_altjvm property is
1277 // private and is processed in process_sun_java_launcher_properties();
1278 // the sun.java.launcher property is passed on to the java application
1279 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1280 // append is true, writable is true, internal is false
1281 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1282 WriteableProperty, ExternalProperty);
1283 } else {
1284 if (strcmp(key, "sun.java.command") == 0) {
1285 char *old_java_command = _java_command;
1286 _java_command = os::strdup_check_oom(value, mtArguments);
1287 if (old_java_command != nullptr) {
1288 os::free(old_java_command);
1289 }
1290 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1291 // If this property is set on the command line then its value will be
1292 // displayed in VM error logs as the URL at which to submit such logs.
1293 // Normally the URL displayed in error logs is different from the value
1294 // of this system property, so a different property should have been
1295 // used here, but we leave this as-is in case someone depends upon it.
1296 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1297 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1298 // its value without going through the property list or making a Java call.
1299 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1300 if (old_java_vendor_url_bug != nullptr) {
1301 os::free((void *)old_java_vendor_url_bug);
1302 }
1303 }
1304
1305 // Create new property and add at the end of the list
1306 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1307 }
1308
1309 if (key != prop) {
1310 // SystemProperty copy passed value, thus free previously allocated
1311 // memory
1312 FreeHeap((void *)key);
1313 }
1314
1315 return true;
1316 }
1317
1318 //===========================================================================================================
1319 // Setting int/mixed/comp mode flags
1320
1321 void Arguments::set_mode_flags(Mode mode) {
1322 // Set up default values for all flags.
1323 // If you add a flag to any of the branches below,
1324 // add a default value for it here.
1325 _mode = mode;
1326
1327 // Ensure Agent_OnLoad has the correct initial values.
1328 // This may not be the final mode; mode may change later in onload phase.
1329 PropertyList_unique_add(&_system_properties, "java.vm.info",
1330 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1331
1332 UseInterpreter = true;
1333 UseCompiler = true;
1334 UseLoopCounter = true;
1335
1336 // Default values may be platform/compiler dependent -
1337 // use the saved values
1338 ClipInlining = Arguments::_ClipInlining;
1339 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1340 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1341 BackgroundCompilation = Arguments::_BackgroundCompilation;
1342
1343 // Change from defaults based on mode
1344 switch (mode) {
1345 default:
1346 ShouldNotReachHere();
1347 break;
1348 case _int:
1349 UseCompiler = false;
1350 UseLoopCounter = false;
1351 AlwaysCompileLoopMethods = false;
1352 UseOnStackReplacement = false;
1353 break;
1354 case _mixed:
1355 // same as default
1356 break;
1357 case _comp:
1358 UseInterpreter = false;
1359 BackgroundCompilation = false;
1360 ClipInlining = false;
1361 break;
1362 }
1363 }
1364
1365 // Conflict: required to use shared spaces (-Xshare:on), but
1366 // incompatible command line options were chosen.
1367 void Arguments::no_shared_spaces(const char* message) {
1368 if (RequireSharedSpaces) {
1369 log_error(cds)("%s is incompatible with other specified options.",
1370 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1371 if (CDSConfig::new_aot_flags_used()) {
1372 vm_exit_during_initialization("Unable to use AOT cache", message);
1373 } else {
1374 vm_exit_during_initialization("Unable to use shared archive", message);
1375 }
1376 } else {
1377 if (CDSConfig::new_aot_flags_used()) {
1378 log_warning(cds)("Unable to use AOT cache: %s", message);
1379 } else {
1380 log_info(cds)("Unable to use shared archive: %s", message);
1381 }
1382 UseSharedSpaces = false;
1383 }
1384 }
1385
1386 static void set_object_alignment() {
1387 // Object alignment.
1388 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1389 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1390 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1391 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1392 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1393 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1394
1395 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1396 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1397
1398 // Oop encoding heap max
1399 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1400 }
1401
1402 size_t Arguments::max_heap_for_compressed_oops() {
1403 // Avoid sign flip.
1404 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1405 // We need to fit both the null page and the heap into the memory budget, while
1406 // keeping alignment constraints of the heap. To guarantee the latter, as the
1407 // null page is located before the heap, we pad the null page to the conservative
1408 // maximum alignment that the GC may ever impose upon the heap.
1409 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1410 _conservative_max_heap_alignment);
1411
1412 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1413 NOT_LP64(ShouldNotReachHere(); return 0);
1414 }
1415
1416 void Arguments::set_use_compressed_oops() {
1417 #ifdef _LP64
1418 // MaxHeapSize is not set up properly at this point, but
1419 // the only value that can override MaxHeapSize if we are
1420 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1421 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1422
1423 if (max_heap_size <= max_heap_for_compressed_oops()) {
1424 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1425 FLAG_SET_ERGO(UseCompressedOops, true);
1426 }
1427 } else {
1428 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1429 warning("Max heap size too large for Compressed Oops");
1430 FLAG_SET_DEFAULT(UseCompressedOops, false);
1431 }
1432 }
1433 #endif // _LP64
1434 }
1435
1436 void Arguments::set_conservative_max_heap_alignment() {
1437 // The conservative maximum required alignment for the heap is the maximum of
1438 // the alignments imposed by several sources: any requirements from the heap
1439 // itself and the maximum page size we may run the VM with.
1440 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1441 _conservative_max_heap_alignment = MAX4(heap_alignment,
1442 os::vm_allocation_granularity(),
1443 os::max_page_size(),
1444 GCArguments::compute_heap_alignment());
1445 }
1446
1447 jint Arguments::set_ergonomics_flags() {
1448 GCConfig::initialize();
1449
1450 set_conservative_max_heap_alignment();
1451
1452 #ifdef _LP64
1453 set_use_compressed_oops();
1454
1455 // Also checks that certain machines are slower with compressed oops
1456 // in vm_version initialization code.
1457 #endif // _LP64
1458
1459 return JNI_OK;
1460 }
1461
1462 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1463 size_t max_allocatable;
1464 size_t result = limit;
1465 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1466 // The AggressiveHeap check is a temporary workaround to avoid calling
1467 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1468 // selected. This works because AggressiveHeap implies UseParallelGC
1469 // where we know the ratio will be 1. Once the AggressiveHeap option is
1470 // removed, this can be cleaned up.
1471 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1472 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1473 result = MIN2(result, max_allocatable / fraction);
1474 }
1475 return result;
1476 }
1477
1478 // Use static initialization to get the default before parsing
1479 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1480
1481 void Arguments::set_heap_size() {
1482 julong phys_mem;
1483
1484 // If the user specified one of these options, they
1485 // want specific memory sizing so do not limit memory
1486 // based on compressed oops addressability.
1487 // Also, memory limits will be calculated based on
1488 // available os physical memory, not our MaxRAM limit,
1489 // unless MaxRAM is also specified.
1490 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1491 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1492 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1493 !FLAG_IS_DEFAULT(MaxRAM));
1494 if (override_coop_limit) {
1495 if (FLAG_IS_DEFAULT(MaxRAM)) {
1496 phys_mem = os::physical_memory();
1497 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1498 } else {
1499 phys_mem = (julong)MaxRAM;
1500 }
1501 } else {
1502 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1503 : (julong)MaxRAM;
1504 }
1505
1506 // If the maximum heap size has not been set with -Xmx,
1507 // then set it as fraction of the size of physical memory,
1508 // respecting the maximum and minimum sizes of the heap.
1509 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1510 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1511 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1512 if (reasonable_min < MaxHeapSize) {
1513 // Small physical memory, so use a minimum fraction of it for the heap
1514 reasonable_max = reasonable_min;
1515 } else {
1516 // Not-small physical memory, so require a heap at least
1517 // as large as MaxHeapSize
1518 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1519 }
1520
1521 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1522 // Limit the heap size to ErgoHeapSizeLimit
1523 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1524 }
1525
1526 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1527
1528 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1529 // An initial heap size was specified on the command line,
1530 // so be sure that the maximum size is consistent. Done
1531 // after call to limit_heap_by_allocatable_memory because that
1532 // method might reduce the allocation size.
1533 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1534 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1535 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1536 }
1537
1538 #ifdef _LP64
1539 if (UseCompressedOops || UseCompressedClassPointers) {
1540 // HeapBaseMinAddress can be greater than default but not less than.
1541 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1542 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1543 // matches compressed oops printing flags
1544 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1545 " (%zuG) which is greater than value given %zu",
1546 DefaultHeapBaseMinAddress,
1547 DefaultHeapBaseMinAddress/G,
1548 HeapBaseMinAddress);
1549 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1550 }
1551 }
1552 }
1553 if (UseCompressedOops) {
1554 // Limit the heap size to the maximum possible when using compressed oops
1555 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1556
1557 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1558 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1559 // but it should be not less than default MaxHeapSize.
1560 max_coop_heap -= HeapBaseMinAddress;
1561 }
1562
1563 // If user specified flags prioritizing os physical
1564 // memory limits, then disable compressed oops if
1565 // limits exceed max_coop_heap and UseCompressedOops
1566 // was not specified.
1567 if (reasonable_max > max_coop_heap) {
1568 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1569 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1570 " max heap %zu > compressed oop heap %zu. "
1571 "Please check the setting of MaxRAMPercentage %5.2f."
1572 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1573 FLAG_SET_ERGO(UseCompressedOops, false);
1574 } else {
1575 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1576 }
1577 }
1578 }
1579 #endif // _LP64
1580
1581 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1582 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1583 }
1584
1585 // If the minimum or initial heap_size have not been set or requested to be set
1586 // ergonomically, set them accordingly.
1587 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1588 julong reasonable_minimum = (julong)(OldSize + NewSize);
1589
1590 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1591
1592 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1593
1594 if (InitialHeapSize == 0) {
1595 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1596 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1597
1598 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1599 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1600
1601 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1602 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1603 }
1604 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1605 // synchronize with InitialHeapSize to avoid errors with the default value.
1606 if (MinHeapSize == 0) {
1607 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1608 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1609 }
1610 }
1611 }
1612
1613 // This option inspects the machine and attempts to set various
1614 // parameters to be optimal for long-running, memory allocation
1615 // intensive jobs. It is intended for machines with large
1616 // amounts of cpu and memory.
1617 jint Arguments::set_aggressive_heap_flags() {
1618 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1619 // VM, but we may not be able to represent the total physical memory
1620 // available (like having 8gb of memory on a box but using a 32bit VM).
1621 // Thus, we need to make sure we're using a julong for intermediate
1622 // calculations.
1623 julong initHeapSize;
1624 julong total_memory = os::physical_memory();
1625
1626 if (total_memory < (julong) 256 * M) {
1627 jio_fprintf(defaultStream::error_stream(),
1628 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1629 vm_exit(1);
1630 }
1631
1632 // The heap size is half of available memory, or (at most)
1633 // all of possible memory less 160mb (leaving room for the OS
1634 // when using ISM). This is the maximum; because adaptive sizing
1635 // is turned on below, the actual space used may be smaller.
1636
1637 initHeapSize = MIN2(total_memory / (julong) 2,
1638 total_memory - (julong) 160 * M);
1639
1640 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1641
1642 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1643 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1644 return JNI_EINVAL;
1645 }
1646 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1647 return JNI_EINVAL;
1648 }
1649 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1650 return JNI_EINVAL;
1651 }
1652 }
1653 if (FLAG_IS_DEFAULT(NewSize)) {
1654 // Make the young generation 3/8ths of the total heap.
1655 if (FLAG_SET_CMDLINE(NewSize,
1656 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1657 return JNI_EINVAL;
1658 }
1659 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1660 return JNI_EINVAL;
1661 }
1662 }
1663
1664 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1665 FLAG_SET_DEFAULT(UseLargePages, true);
1666 #endif
1667
1668 // Increase some data structure sizes for efficiency
1669 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1673 return JNI_EINVAL;
1674 }
1675
1676 // See the OldPLABSize comment below, but replace 'after promotion'
1677 // with 'after copying'. YoungPLABSize is the size of the survivor
1678 // space per-gc-thread buffers. The default is 4kw.
1679 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1680 return JNI_EINVAL;
1681 }
1682
1683 // OldPLABSize is the size of the buffers in the old gen that
1684 // UseParallelGC uses to promote live data that doesn't fit in the
1685 // survivor spaces. At any given time, there's one for each gc thread.
1686 // The default size is 1kw. These buffers are rarely used, since the
1687 // survivor spaces are usually big enough. For specjbb, however, there
1688 // are occasions when there's lots of live data in the young gen
1689 // and we end up promoting some of it. We don't have a definite
1690 // explanation for why bumping OldPLABSize helps, but the theory
1691 // is that a bigger PLAB results in retaining something like the
1692 // original allocation order after promotion, which improves mutator
1693 // locality. A minor effect may be that larger PLABs reduce the
1694 // number of PLAB allocation events during gc. The value of 8kw
1695 // was arrived at by experimenting with specjbb.
1696 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1697 return JNI_EINVAL;
1698 }
1699
1700 // Enable parallel GC and adaptive generation sizing
1701 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1702 return JNI_EINVAL;
1703 }
1704
1705 // Encourage steady state memory management
1706 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1707 return JNI_EINVAL;
1708 }
1709
1710 return JNI_OK;
1711 }
1712
1713 // This must be called after ergonomics.
1714 void Arguments::set_bytecode_flags() {
1715 if (!RewriteBytecodes) {
1716 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1717 }
1718 }
1719
1720 // Aggressive optimization flags
1721 jint Arguments::set_aggressive_opts_flags() {
1722 #ifdef COMPILER2
1723 if (AggressiveUnboxing) {
1724 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1725 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1726 } else if (!EliminateAutoBox) {
1727 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1728 AggressiveUnboxing = false;
1729 }
1730 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1731 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1732 } else if (!DoEscapeAnalysis) {
1733 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1734 AggressiveUnboxing = false;
1735 }
1736 }
1737 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1738 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1739 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1740 }
1741 // Feed the cache size setting into the JDK
1742 char buffer[1024];
1743 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1744 if (!add_property(buffer)) {
1745 return JNI_ENOMEM;
1746 }
1747 }
1748 #endif
1749
1750 return JNI_OK;
1751 }
1752
1753 //===========================================================================================================
1754
1755 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1756 if (_sun_java_launcher != _default_java_launcher) {
1757 os::free(const_cast<char*>(_sun_java_launcher));
1758 }
1759 _sun_java_launcher = os::strdup_check_oom(launcher);
1760 }
1761
1762 bool Arguments::created_by_java_launcher() {
1763 assert(_sun_java_launcher != nullptr, "property must have value");
1764 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1765 }
1766
1767 bool Arguments::sun_java_launcher_is_altjvm() {
1768 return _sun_java_launcher_is_altjvm;
1769 }
1770
1771 //===========================================================================================================
1772 // Parsing of main arguments
1773
1774 static unsigned int addreads_count = 0;
1775 static unsigned int addexports_count = 0;
1776 static unsigned int addopens_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(mode_flag_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 structure
1952
1953 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1954 const JavaVMInitArgs *java_tool_options_args,
1955 const JavaVMInitArgs *java_options_args,
1956 const JavaVMInitArgs *cmd_line_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 structure 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 structure 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 structure 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 structure 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 // Disable CDS for exploded image
1996 if (!has_jimage()) {
1997 no_shared_spaces("CDS disabled on exploded JDK");
1998 }
1999
2000 // We need to ensure processor and memory resources have been properly
2001 // configured - which may rely on arguments we just processed - before
2002 // doing the final argument processing. Any argument processing that
2003 // needs to know about processor and memory resources must occur after
2004 // this point.
2005
2006 os::init_container_support();
2007
2008 SystemMemoryBarrier::initialize();
2009
2010 // Do final processing now that all arguments have been parsed
2011 result = finalize_vm_init_args();
2012 if (result != JNI_OK) {
2013 return result;
2014 }
2015
2016 return JNI_OK;
2017 }
2018
2019 #if !INCLUDE_JVMTI || INCLUDE_CDS
2020 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2021 // represents a valid JDWP agent. is_path==true denotes that we
2022 // are dealing with -agentpath (case where name is a path), otherwise with
2023 // -agentlib
2024 static bool valid_jdwp_agent(char *name, bool is_path) {
2025 char *_name;
2026 const char *_jdwp = "jdwp";
2027 size_t _len_jdwp, _len_prefix;
2028
2029 if (is_path) {
2030 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2031 return false;
2032 }
2033
2034 _name++; // skip past last path separator
2035 _len_prefix = strlen(JNI_LIB_PREFIX);
2036
2037 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2038 return false;
2039 }
2040
2041 _name += _len_prefix;
2042 _len_jdwp = strlen(_jdwp);
2043
2044 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2045 _name += _len_jdwp;
2046 }
2047 else {
2048 return false;
2049 }
2050
2051 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2052 return false;
2053 }
2054
2055 return true;
2056 }
2057
2058 if (strcmp(name, _jdwp) == 0) {
2059 return true;
2060 }
2061
2062 return false;
2063 }
2064 #endif
2065
2066 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2067 // --patch-module=<module>=<file>(<pathsep><file>)*
2068 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2069 // Find the equal sign between the module name and the path specification
2070 const char* module_equal = strchr(patch_mod_tail, '=');
2071 if (module_equal == nullptr) {
2072 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2073 return JNI_ERR;
2074 } else {
2075 // Pick out the module name
2076 size_t module_len = module_equal - patch_mod_tail;
2077 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2078 if (module_name != nullptr) {
2079 memcpy(module_name, patch_mod_tail, module_len);
2080 *(module_name + module_len) = '\0';
2081 // The path piece begins one past the module_equal sign
2082 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2083 FREE_C_HEAP_ARRAY(char, module_name);
2084 } else {
2085 return JNI_ENOMEM;
2086 }
2087 }
2088 return JNI_OK;
2089 }
2090
2091 // VALUECLASS_STR must match string used in the build
2092 #define VALUECLASS_STR "valueclasses"
2093 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2094
2095 // Finalize --patch-module args and --enable-preview related to value class module patches.
2096 // Create all numbered properties passing module patches.
2097 int Arguments::finalize_patch_module() {
2098 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2099 // are to be patched into the module.
2100 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2101 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2102 if (enable_preview() && EnableValhalla) {
2103 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2104 const char * fileSep = os::file_separator();
2105
2106 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2107 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2108 DIR* dir = os::opendir(valueclasses_dir);
2109 if (dir != nullptr) {
2110 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2111 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2112
2113 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2114 // Test if file ends-with "-valueclasses.jar"
2115 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2116 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2117 continue; // too short or not the expected suffix
2118 }
2119
2120 strcpy(module_name, entry->d_name);
2121 module_name[len] = '\0'; // truncate to just module-name
2122
2123 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2124 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2125 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2126 }
2127 FreeHeap(module_name);
2128 FreeHeap(path);
2129 os::closedir(dir);
2130 }
2131 FreeHeap(valueclasses_dir);
2132 }
2133
2134 // Create numbered properties for each module that has been patched either
2135 // by --patch-module or --enable-preview
2136 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2137 if (_patch_mod_prefix != nullptr) {
2138 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2139 unsigned int patch_mod_count = 0;
2140
2141 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2142 it != _patch_mod_prefix->end(); ++it) {
2143 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2144 (*it)->module_name(), (*it)->path_string());
2145 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2146 FreeHeap(prop_value);
2147 return JNI_ENOMEM;
2148 }
2149 }
2150 FreeHeap(prop_value);
2151 }
2152 return JNI_OK;
2153 }
2154
2155 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2156 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2157 // The min and max sizes match the values in globals.hpp, but scaled
2158 // with K. The values have been chosen so that alignment with page
2159 // size doesn't change the max value, which makes the conversions
2160 // back and forth between Xss value and ThreadStackSize value easier.
2161 // The values have also been chosen to fit inside a 32-bit signed type.
2162 const julong min_ThreadStackSize = 0;
2163 const julong max_ThreadStackSize = 1 * M;
2164
2165 // Make sure the above values match the range set in globals.hpp
2166 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2167 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2168 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2169
2170 const julong min_size = min_ThreadStackSize * K;
2171 const julong max_size = max_ThreadStackSize * K;
2172
2173 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2174
2175 julong size = 0;
2176 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2177 if (errcode != arg_in_range) {
2178 bool silent = (option == nullptr); // Allow testing to silence error messages
2179 if (!silent) {
2180 jio_fprintf(defaultStream::error_stream(),
2181 "Invalid thread stack size: %s\n", option->optionString);
2182 describe_range_error(errcode);
2183 }
2184 return JNI_EINVAL;
2185 }
2186
2187 // Internally track ThreadStackSize in units of 1024 bytes.
2188 const julong size_aligned = align_up(size, K);
2189 assert(size <= size_aligned,
2190 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2191 size, size_aligned);
2192
2193 const julong size_in_K = size_aligned / K;
2194 assert(size_in_K < (julong)max_intx,
2195 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2196 size_in_K);
2197
2198 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2199 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2200 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2201 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2202 max_expanded, size_in_K);
2203
2204 *out_ThreadStackSize = (intx)size_in_K;
2205
2206 return JNI_OK;
2207 }
2208
2209 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2210 // For match_option to return remaining or value part of option string
2211 const char* tail;
2212
2213 // iterate over arguments
2214 for (int index = 0; index < args->nOptions; index++) {
2215 bool is_absolute_path = false; // for -agentpath vs -agentlib
2216
2217 const JavaVMOption* option = args->options + index;
2218
2219 if (!match_option(option, "-Djava.class.path", &tail) &&
2220 !match_option(option, "-Dsun.java.command", &tail) &&
2221 !match_option(option, "-Dsun.java.launcher", &tail)) {
2222
2223 // add all jvm options to the jvm_args string. This string
2224 // is used later to set the java.vm.args PerfData string constant.
2225 // the -Djava.class.path and the -Dsun.java.command options are
2226 // omitted from jvm_args string as each have their own PerfData
2227 // string constant object.
2228 build_jvm_args(option->optionString);
2229 }
2230
2231 // -verbose:[class/module/gc/jni]
2232 if (match_option(option, "-verbose", &tail)) {
2233 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2234 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2235 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2236 } else if (!strcmp(tail, ":module")) {
2237 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2238 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2239 } else if (!strcmp(tail, ":gc")) {
2240 if (_legacyGCLogging.lastFlag == 0) {
2241 _legacyGCLogging.lastFlag = 1;
2242 }
2243 } else if (!strcmp(tail, ":jni")) {
2244 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2245 }
2246 // -da / -ea / -disableassertions / -enableassertions
2247 // These accept an optional class/package name separated by a colon, e.g.,
2248 // -da:java.lang.Thread.
2249 } else if (match_option(option, user_assertion_options, &tail, true)) {
2250 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2251 if (*tail == '\0') {
2252 JavaAssertions::setUserClassDefault(enable);
2253 } else {
2254 assert(*tail == ':', "bogus match by match_option()");
2255 JavaAssertions::addOption(tail + 1, enable);
2256 }
2257 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2258 } else if (match_option(option, system_assertion_options, &tail, false)) {
2259 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2260 JavaAssertions::setSystemClassDefault(enable);
2261 // -bootclasspath:
2262 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2263 jio_fprintf(defaultStream::output_stream(),
2264 "-Xbootclasspath is no longer a supported option.\n");
2265 return JNI_EINVAL;
2266 // -bootclasspath/a:
2267 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2268 Arguments::append_sysclasspath(tail);
2269 // -bootclasspath/p:
2270 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2271 jio_fprintf(defaultStream::output_stream(),
2272 "-Xbootclasspath/p is no longer a supported option.\n");
2273 return JNI_EINVAL;
2274 // -Xrun
2275 } else if (match_option(option, "-Xrun", &tail)) {
2276 if (tail != nullptr) {
2277 const char* pos = strchr(tail, ':');
2278 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2279 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2280 jio_snprintf(name, len + 1, "%s", tail);
2281
2282 char *options = nullptr;
2283 if(pos != nullptr) {
2284 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2285 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2286 }
2287 #if !INCLUDE_JVMTI
2288 if (strcmp(name, "jdwp") == 0) {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Debugging agents are not supported in this VM\n");
2291 return JNI_ERR;
2292 }
2293 #endif // !INCLUDE_JVMTI
2294 JvmtiAgentList::add_xrun(name, options, false);
2295 FREE_C_HEAP_ARRAY(char, name);
2296 FREE_C_HEAP_ARRAY(char, options);
2297 }
2298 } else if (match_option(option, "--add-reads=", &tail)) {
2299 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2300 return JNI_ENOMEM;
2301 }
2302 } else if (match_option(option, "--add-exports=", &tail)) {
2303 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2304 return JNI_ENOMEM;
2305 }
2306 } else if (match_option(option, "--add-opens=", &tail)) {
2307 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2308 return JNI_ENOMEM;
2309 }
2310 } else if (match_option(option, "--add-modules=", &tail)) {
2311 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2312 return JNI_ENOMEM;
2313 }
2314 } else if (match_option(option, "--enable-native-access=", &tail)) {
2315 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2316 return JNI_ENOMEM;
2317 }
2318 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2319 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2320 return JNI_ENOMEM;
2321 }
2322 } else if (match_option(option, "--limit-modules=", &tail)) {
2323 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2324 return JNI_ENOMEM;
2325 }
2326 } else if (match_option(option, "--module-path=", &tail)) {
2327 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2328 return JNI_ENOMEM;
2329 }
2330 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2331 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2332 return JNI_ENOMEM;
2333 }
2334 } else if (match_option(option, "--patch-module=", &tail)) {
2335 // --patch-module=<module>=<file>(<pathsep><file>)*
2336 int res = process_patch_mod_option(tail);
2337 if (res != JNI_OK) {
2338 return res;
2339 }
2340 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2341 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2342 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2343 AddProperty, WriteableProperty, InternalProperty);
2344 } else {
2345 jio_fprintf(defaultStream::error_stream(),
2346 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2347 return JNI_ERR;
2348 }
2349 } else if (match_option(option, "--illegal-access=", &tail)) {
2350 char version[256];
2351 JDK_Version::jdk(17).to_string(version, sizeof(version));
2352 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2353 // -agentlib and -agentpath
2354 } else if (match_option(option, "-agentlib:", &tail) ||
2355 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2356 if(tail != nullptr) {
2357 const char* pos = strchr(tail, '=');
2358 char* name;
2359 if (pos == nullptr) {
2360 name = os::strdup_check_oom(tail, mtArguments);
2361 } else {
2362 size_t len = pos - tail;
2363 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2364 memcpy(name, tail, len);
2365 name[len] = '\0';
2366 }
2367
2368 char *options = nullptr;
2369 if(pos != nullptr) {
2370 options = os::strdup_check_oom(pos + 1, mtArguments);
2371 }
2372 #if !INCLUDE_JVMTI
2373 if (valid_jdwp_agent(name, is_absolute_path)) {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Debugging agents are not supported in this VM\n");
2376 return JNI_ERR;
2377 }
2378 #elif INCLUDE_CDS
2379 if (valid_jdwp_agent(name, is_absolute_path)) {
2380 _has_jdwp_agent = true;
2381 }
2382 #endif // !INCLUDE_JVMTI
2383 JvmtiAgentList::add(name, options, is_absolute_path);
2384 os::free(name);
2385 os::free(options);
2386 }
2387 // -javaagent
2388 } else if (match_option(option, "-javaagent:", &tail)) {
2389 #if !INCLUDE_JVMTI
2390 jio_fprintf(defaultStream::error_stream(),
2391 "Instrumentation agents are not supported in this VM\n");
2392 return JNI_ERR;
2393 #else
2394 if (tail != nullptr) {
2395 size_t length = strlen(tail) + 1;
2396 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2397 jio_snprintf(options, length, "%s", tail);
2398 JvmtiAgentList::add("instrument", options, false);
2399 FREE_C_HEAP_ARRAY(char, options);
2400
2401 // java agents need module java.instrument
2402 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2403 return JNI_ENOMEM;
2404 }
2405 }
2406 #endif // !INCLUDE_JVMTI
2407 // --enable_preview
2408 } else if (match_option(option, "--enable-preview")) {
2409 set_enable_preview();
2410 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2411 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2412 return JNI_EINVAL;
2413 }
2414 // -Xnoclassgc
2415 } else if (match_option(option, "-Xnoclassgc")) {
2416 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2417 return JNI_EINVAL;
2418 }
2419 // -Xbatch
2420 } else if (match_option(option, "-Xbatch")) {
2421 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2422 return JNI_EINVAL;
2423 }
2424 // -Xmn for compatibility with other JVM vendors
2425 } else if (match_option(option, "-Xmn", &tail)) {
2426 julong long_initial_young_size = 0;
2427 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2428 if (errcode != arg_in_range) {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Invalid initial young generation size: %s\n", option->optionString);
2431 describe_range_error(errcode);
2432 return JNI_EINVAL;
2433 }
2434 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2435 return JNI_EINVAL;
2436 }
2437 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2438 return JNI_EINVAL;
2439 }
2440 // -Xms
2441 } else if (match_option(option, "-Xms", &tail)) {
2442 julong size = 0;
2443 // an initial heap size of 0 means automatically determine
2444 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2445 if (errcode != arg_in_range) {
2446 jio_fprintf(defaultStream::error_stream(),
2447 "Invalid initial heap size: %s\n", option->optionString);
2448 describe_range_error(errcode);
2449 return JNI_EINVAL;
2450 }
2451 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2452 return JNI_EINVAL;
2453 }
2454 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2455 return JNI_EINVAL;
2456 }
2457 // -Xmx
2458 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2459 julong long_max_heap_size = 0;
2460 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2461 if (errcode != arg_in_range) {
2462 jio_fprintf(defaultStream::error_stream(),
2463 "Invalid maximum heap size: %s\n", option->optionString);
2464 describe_range_error(errcode);
2465 return JNI_EINVAL;
2466 }
2467 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2468 return JNI_EINVAL;
2469 }
2470 // Xmaxf
2471 } else if (match_option(option, "-Xmaxf", &tail)) {
2472 char* err;
2473 int maxf = (int)(strtod(tail, &err) * 100);
2474 if (*err != '\0' || *tail == '\0') {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Bad max heap free percentage size: %s\n",
2477 option->optionString);
2478 return JNI_EINVAL;
2479 } else {
2480 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2481 return JNI_EINVAL;
2482 }
2483 }
2484 // Xminf
2485 } else if (match_option(option, "-Xminf", &tail)) {
2486 char* err;
2487 int minf = (int)(strtod(tail, &err) * 100);
2488 if (*err != '\0' || *tail == '\0') {
2489 jio_fprintf(defaultStream::error_stream(),
2490 "Bad min heap free percentage size: %s\n",
2491 option->optionString);
2492 return JNI_EINVAL;
2493 } else {
2494 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2495 return JNI_EINVAL;
2496 }
2497 }
2498 // -Xss
2499 } else if (match_option(option, "-Xss", &tail)) {
2500 intx value = 0;
2501 jint err = parse_xss(option, tail, &value);
2502 if (err != JNI_OK) {
2503 return err;
2504 }
2505 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2506 return JNI_EINVAL;
2507 }
2508 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2509 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2510 julong long_ReservedCodeCacheSize = 0;
2511
2512 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2513 if (errcode != arg_in_range) {
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Invalid maximum code cache size: %s.\n", option->optionString);
2516 return JNI_EINVAL;
2517 }
2518 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2519 return JNI_EINVAL;
2520 }
2521 // -green
2522 } else if (match_option(option, "-green")) {
2523 jio_fprintf(defaultStream::error_stream(),
2524 "Green threads support not available\n");
2525 return JNI_EINVAL;
2526 // -native
2527 } else if (match_option(option, "-native")) {
2528 // HotSpot always uses native threads, ignore silently for compatibility
2529 // -Xrs
2530 } else if (match_option(option, "-Xrs")) {
2531 // Classic/EVM option, new functionality
2532 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2533 return JNI_EINVAL;
2534 }
2535 // -Xprof
2536 } else if (match_option(option, "-Xprof")) {
2537 char version[256];
2538 // Obsolete in JDK 10
2539 JDK_Version::jdk(10).to_string(version, sizeof(version));
2540 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2541 // -Xinternalversion
2542 } else if (match_option(option, "-Xinternalversion")) {
2543 jio_fprintf(defaultStream::output_stream(), "%s\n",
2544 VM_Version::internal_vm_info_string());
2545 vm_exit(0);
2546 #ifndef PRODUCT
2547 // -Xprintflags
2548 } else if (match_option(option, "-Xprintflags")) {
2549 JVMFlag::printFlags(tty, false);
2550 vm_exit(0);
2551 #endif
2552 // -D
2553 } else if (match_option(option, "-D", &tail)) {
2554 const char* value;
2555 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2556 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2557 // abort if -Djava.endorsed.dirs is set
2558 jio_fprintf(defaultStream::output_stream(),
2559 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2560 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2561 return JNI_EINVAL;
2562 }
2563 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2564 *value != '\0' && strcmp(value, "\"\"") != 0) {
2565 // abort if -Djava.ext.dirs is set
2566 jio_fprintf(defaultStream::output_stream(),
2567 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2568 return JNI_EINVAL;
2569 }
2570 // Check for module related properties. They must be set using the modules
2571 // options. For example: use "--add-modules=java.sql", not
2572 // "-Djdk.module.addmods=java.sql"
2573 if (is_internal_module_property(option->optionString + 2)) {
2574 needs_module_property_warning = true;
2575 continue;
2576 }
2577 if (!add_property(tail)) {
2578 return JNI_ENOMEM;
2579 }
2580 // Out of the box management support
2581 if (match_option(option, "-Dcom.sun.management", &tail)) {
2582 #if INCLUDE_MANAGEMENT
2583 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2584 return JNI_EINVAL;
2585 }
2586 // management agent in module jdk.management.agent
2587 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2588 return JNI_ENOMEM;
2589 }
2590 #else
2591 jio_fprintf(defaultStream::output_stream(),
2592 "-Dcom.sun.management is not supported in this VM.\n");
2593 return JNI_ERR;
2594 #endif
2595 }
2596 // -Xint
2597 } else if (match_option(option, "-Xint")) {
2598 set_mode_flags(_int);
2599 mode_flag_cmd_line = true;
2600 // -Xmixed
2601 } else if (match_option(option, "-Xmixed")) {
2602 set_mode_flags(_mixed);
2603 mode_flag_cmd_line = true;
2604 // -Xcomp
2605 } else if (match_option(option, "-Xcomp")) {
2606 // for testing the compiler; turn off all flags that inhibit compilation
2607 set_mode_flags(_comp);
2608 mode_flag_cmd_line = true;
2609 // -Xshare:dump
2610 } else if (match_option(option, "-Xshare:dump")) {
2611 CDSConfig::enable_dumping_static_archive();
2612 CDSConfig::set_old_cds_flags_used();
2613 // -Xshare:on
2614 } else if (match_option(option, "-Xshare:on")) {
2615 UseSharedSpaces = true;
2616 RequireSharedSpaces = true;
2617 CDSConfig::set_old_cds_flags_used();
2618 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2619 } else if (match_option(option, "-Xshare:auto")) {
2620 UseSharedSpaces = true;
2621 RequireSharedSpaces = false;
2622 xshare_auto_cmd_line = true;
2623 CDSConfig::set_old_cds_flags_used();
2624 // -Xshare:off
2625 } else if (match_option(option, "-Xshare:off")) {
2626 UseSharedSpaces = false;
2627 RequireSharedSpaces = false;
2628 CDSConfig::set_old_cds_flags_used();
2629 // -Xverify
2630 } else if (match_option(option, "-Xverify", &tail)) {
2631 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2632 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2633 return JNI_EINVAL;
2634 }
2635 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2636 return JNI_EINVAL;
2637 }
2638 } else if (strcmp(tail, ":remote") == 0) {
2639 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2640 return JNI_EINVAL;
2641 }
2642 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 } else if (strcmp(tail, ":none") == 0) {
2646 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2653 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2654 return JNI_EINVAL;
2655 }
2656 // -Xdebug
2657 } else if (match_option(option, "-Xdebug")) {
2658 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2659 } else if (match_option(option, "-Xloggc:", &tail)) {
2660 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2661 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2662 _legacyGCLogging.lastFlag = 2;
2663 _legacyGCLogging.file = os::strdup_check_oom(tail);
2664 } else if (match_option(option, "-Xlog", &tail)) {
2665 bool ret = false;
2666 if (strcmp(tail, ":help") == 0) {
2667 fileStream stream(defaultStream::output_stream());
2668 LogConfiguration::print_command_line_help(&stream);
2669 vm_exit(0);
2670 } else if (strcmp(tail, ":disable") == 0) {
2671 LogConfiguration::disable_logging();
2672 ret = true;
2673 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2674 const char* async_tail = tail + strlen(":async");
2675 ret = LogConfiguration::parse_async_argument(async_tail);
2676 } else if (*tail == '\0') {
2677 ret = LogConfiguration::parse_command_line_arguments();
2678 assert(ret, "-Xlog without arguments should never fail to parse");
2679 } else if (*tail == ':') {
2680 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2681 }
2682 if (ret == false) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2685 tail);
2686 return JNI_EINVAL;
2687 }
2688 // JNI hooks
2689 } else if (match_option(option, "-Xcheck", &tail)) {
2690 if (!strcmp(tail, ":jni")) {
2691 #if !INCLUDE_JNI_CHECK
2692 warning("JNI CHECKING is not supported in this VM");
2693 #else
2694 CheckJNICalls = true;
2695 #endif // INCLUDE_JNI_CHECK
2696 } else if (is_bad_option(option, args->ignoreUnrecognized,
2697 "check")) {
2698 return JNI_EINVAL;
2699 }
2700 } else if (match_option(option, "vfprintf")) {
2701 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2702 } else if (match_option(option, "exit")) {
2703 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2704 } else if (match_option(option, "abort")) {
2705 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2706 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2707 // and the last option wins.
2708 } else if (match_option(option, "-XX:+NeverTenure")) {
2709 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2710 return JNI_EINVAL;
2711 }
2712 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2719 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2726 return JNI_EINVAL;
2727 }
2728 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2729 uint max_tenuring_thresh = 0;
2730 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2731 jio_fprintf(defaultStream::error_stream(),
2732 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2733 return JNI_EINVAL;
2734 }
2735
2736 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739
2740 if (MaxTenuringThreshold == 0) {
2741 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 } else {
2748 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 }
2755 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2756 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2763 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2770 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2774 return JNI_EINVAL;
2775 }
2776 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2777 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 } else if (match_option(option, "--finalization=", &tail)) {
2784 if (strcmp(tail, "enabled") == 0) {
2785 InstanceKlass::set_finalization_enabled(true);
2786 } else if (strcmp(tail, "disabled") == 0) {
2787 InstanceKlass::set_finalization_enabled(false);
2788 } else {
2789 jio_fprintf(defaultStream::error_stream(),
2790 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2791 tail);
2792 return JNI_EINVAL;
2793 }
2794 #if !defined(DTRACE_ENABLED)
2795 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "DTraceMethodProbes flag is not applicable for this configuration\n");
2798 return JNI_EINVAL;
2799 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "DTraceAllocProbes flag is not applicable for this configuration\n");
2802 return JNI_EINVAL;
2803 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2804 jio_fprintf(defaultStream::error_stream(),
2805 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2806 return JNI_EINVAL;
2807 #endif // !defined(DTRACE_ENABLED)
2808 #ifdef ASSERT
2809 } else if (match_option(option, "-XX:+FullGCALot")) {
2810 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2811 return JNI_EINVAL;
2812 }
2813 #endif
2814 #if !INCLUDE_MANAGEMENT
2815 } else if (match_option(option, "-XX:+ManagementServer")) {
2816 jio_fprintf(defaultStream::error_stream(),
2817 "ManagementServer is not supported in this VM.\n");
2818 return JNI_ERR;
2819 #endif // INCLUDE_MANAGEMENT
2820 #if INCLUDE_JVMCI
2821 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2822 if (EnableJVMCIProduct) {
2823 jio_fprintf(defaultStream::error_stream(),
2824 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2825 return JNI_EINVAL;
2826 }
2827 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2828 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2829 if (use_graal_jit) {
2830 const char* jvmci_compiler = get_property("jvmci.Compiler");
2831 if (jvmci_compiler != nullptr) {
2832 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2833 jio_fprintf(defaultStream::error_stream(),
2834 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2835 return JNI_ERR;
2836 }
2837 } else if (!add_property("jvmci.Compiler=graal")) {
2838 return JNI_ENOMEM;
2839 }
2840 }
2841
2842 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2843 if (EnableJVMCIProduct) {
2844 continue;
2845 }
2846 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2847 // Allow this flag if it has been unlocked.
2848 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2849 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Unable to enable JVMCI in product mode\n");
2852 return JNI_ERR;
2853 }
2854 }
2855 // The flag was locked so process normally to report that error
2856 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2857 return JNI_EINVAL;
2858 }
2859 #endif // INCLUDE_JVMCI
2860 #if INCLUDE_JFR
2861 } else if (match_jfr_option(&option)) {
2862 return JNI_EINVAL;
2863 #endif
2864 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2865 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2866 // already been handled
2867 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2868 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2869 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2870 return JNI_EINVAL;
2871 }
2872 }
2873 // Unknown option
2874 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2875 return JNI_ERR;
2876 }
2877 }
2878
2879 // PrintSharedArchiveAndExit will turn on
2880 // -Xshare:on
2881 // -Xlog:class+path=info
2882 if (PrintSharedArchiveAndExit) {
2883 UseSharedSpaces = true;
2884 RequireSharedSpaces = true;
2885 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2886 }
2887
2888 fix_appclasspath();
2889
2890 return JNI_OK;
2891 }
2892
2893 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2894 if (!allow_cds) {
2895 CDSConfig::set_module_patching_disables_cds();
2896 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2897 CDSConfig::set_java_base_module_patching_disables_cds();
2898 }
2899 }
2900
2901 // Create GrowableArray lazily, only if --patch-module has been specified
2902 if (_patch_mod_prefix == nullptr) {
2903 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2904 }
2905
2906 // Scan patches for matching module
2907 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2908 return (strcmp(module_name, patch->module_name()) == 0);
2909 });
2910 if (i == -1) {
2911 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2912 } else {
2913 if (allow_append) {
2914 // append path to existing module entry
2915 _patch_mod_prefix->at(i)->append_path(path);
2916 } else {
2917 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2918 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2919 } else {
2920 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2921 }
2922 }
2923 }
2924 }
2925
2926 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2927 //
2928 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2929 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2930 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2931 // path is treated as the current directory.
2932 //
2933 // This causes problems with CDS, which requires that all directories specified in the classpath
2934 // must be empty. In most cases, applications do NOT want to load classes from the current
2935 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2936 // scripts compatible with CDS.
2937 void Arguments::fix_appclasspath() {
2938 if (IgnoreEmptyClassPaths) {
2939 const char separator = *os::path_separator();
2940 const char* src = _java_class_path->value();
2941
2942 // skip over all the leading empty paths
2943 while (*src == separator) {
2944 src ++;
2945 }
2946
2947 char* copy = os::strdup_check_oom(src, mtArguments);
2948
2949 // trim all trailing empty paths
2950 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2951 *tail = '\0';
2952 }
2953
2954 char from[3] = {separator, separator, '\0'};
2955 char to [2] = {separator, '\0'};
2956 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2957 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2958 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2959 }
2960
2961 _java_class_path->set_writeable_value(copy);
2962 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2963 }
2964 }
2965
2966 jint Arguments::finalize_vm_init_args() {
2967 // check if the default lib/endorsed directory exists; if so, error
2968 char path[JVM_MAXPATHLEN];
2969 const char* fileSep = os::file_separator();
2970 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2971
2972 DIR* dir = os::opendir(path);
2973 if (dir != nullptr) {
2974 jio_fprintf(defaultStream::output_stream(),
2975 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2976 "in modular form will be supported via the concept of upgradeable modules.\n");
2977 os::closedir(dir);
2978 return JNI_ERR;
2979 }
2980
2981 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2982 dir = os::opendir(path);
2983 if (dir != nullptr) {
2984 jio_fprintf(defaultStream::output_stream(),
2985 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2986 "Use -classpath instead.\n.");
2987 os::closedir(dir);
2988 return JNI_ERR;
2989 }
2990
2991 // This must be done after all arguments have been processed
2992 // and the container support has been initialized since AggressiveHeap
2993 // relies on the amount of total memory available.
2994 if (AggressiveHeap) {
2995 jint result = set_aggressive_heap_flags();
2996 if (result != JNI_OK) {
2997 return result;
2998 }
2999 }
3000
3001 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3002 // but like -Xint, leave compilation thresholds unaffected.
3003 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3004 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3005 set_mode_flags(_int);
3006 }
3007
3008 #ifdef ZERO
3009 // Zero always runs in interpreted mode
3010 set_mode_flags(_int);
3011 #endif
3012
3013 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3014 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3015 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3016 }
3017
3018 #if !COMPILER2_OR_JVMCI
3019 // Don't degrade server performance for footprint
3020 if (FLAG_IS_DEFAULT(UseLargePages) &&
3021 MaxHeapSize < LargePageHeapSizeThreshold) {
3022 // No need for large granularity pages w/small heaps.
3023 // Note that large pages are enabled/disabled for both the
3024 // Java heap and the code cache.
3025 FLAG_SET_DEFAULT(UseLargePages, false);
3026 }
3027
3028 UNSUPPORTED_OPTION(ProfileInterpreter);
3029 #endif
3030
3031 // Parse the CompilationMode flag
3032 if (!CompilationModeFlag::initialize()) {
3033 return JNI_ERR;
3034 }
3035
3036 // finalize --module-patch and related --enable-preview
3037 if (finalize_patch_module() != JNI_OK) {
3038 return JNI_ERR;
3039 }
3040
3041 if (!check_vm_args_consistency()) {
3042 return JNI_ERR;
3043 }
3044
3045 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3046 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3047 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3048
3049 return JNI_OK;
3050 }
3051
3052 // Helper class for controlling the lifetime of JavaVMInitArgs
3053 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3054 // deleted on the destruction of the ScopedVMInitArgs object.
3055 class ScopedVMInitArgs : public StackObj {
3056 private:
3057 JavaVMInitArgs _args;
3058 char* _container_name;
3059 bool _is_set;
3060 char* _vm_options_file_arg;
3061
3062 public:
3063 ScopedVMInitArgs(const char *container_name) {
3064 _args.version = JNI_VERSION_1_2;
3065 _args.nOptions = 0;
3066 _args.options = nullptr;
3067 _args.ignoreUnrecognized = false;
3068 _container_name = (char *)container_name;
3069 _is_set = false;
3070 _vm_options_file_arg = nullptr;
3071 }
3072
3073 // Populates the JavaVMInitArgs object represented by this
3074 // ScopedVMInitArgs object with the arguments in options. The
3075 // allocated memory is deleted by the destructor. If this method
3076 // returns anything other than JNI_OK, then this object is in a
3077 // partially constructed state, and should be abandoned.
3078 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3079 _is_set = true;
3080 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3081 JavaVMOption, options->length(), mtArguments);
3082 if (options_arr == nullptr) {
3083 return JNI_ENOMEM;
3084 }
3085 _args.options = options_arr;
3086
3087 for (int i = 0; i < options->length(); i++) {
3088 options_arr[i] = options->at(i);
3089 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3090 if (options_arr[i].optionString == nullptr) {
3091 // Rely on the destructor to do cleanup.
3092 _args.nOptions = i;
3093 return JNI_ENOMEM;
3094 }
3095 }
3096
3097 _args.nOptions = options->length();
3098 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3099 return JNI_OK;
3100 }
3101
3102 JavaVMInitArgs* get() { return &_args; }
3103 char* container_name() { return _container_name; }
3104 bool is_set() { return _is_set; }
3105 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3106 char* vm_options_file_arg() { return _vm_options_file_arg; }
3107
3108 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3109 if (_vm_options_file_arg != nullptr) {
3110 os::free(_vm_options_file_arg);
3111 }
3112 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3113 }
3114
3115 ~ScopedVMInitArgs() {
3116 if (_vm_options_file_arg != nullptr) {
3117 os::free(_vm_options_file_arg);
3118 }
3119 if (_args.options == nullptr) return;
3120 for (int i = 0; i < _args.nOptions; i++) {
3121 os::free(_args.options[i].optionString);
3122 }
3123 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3124 }
3125
3126 // Insert options into this option list, to replace option at
3127 // vm_options_file_pos (-XX:VMOptionsFile)
3128 jint insert(const JavaVMInitArgs* args,
3129 const JavaVMInitArgs* args_to_insert,
3130 const int vm_options_file_pos) {
3131 assert(_args.options == nullptr, "shouldn't be set yet");
3132 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3133 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3134
3135 int length = args->nOptions + args_to_insert->nOptions - 1;
3136 // Construct new option array
3137 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3138 for (int i = 0; i < args->nOptions; i++) {
3139 if (i == vm_options_file_pos) {
3140 // insert the new options starting at the same place as the
3141 // -XX:VMOptionsFile option
3142 for (int j = 0; j < args_to_insert->nOptions; j++) {
3143 options.push(args_to_insert->options[j]);
3144 }
3145 } else {
3146 options.push(args->options[i]);
3147 }
3148 }
3149 // make into options array
3150 return set_args(&options);
3151 }
3152 };
3153
3154 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3155 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3156 }
3157
3158 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3159 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3160 }
3161
3162 jint Arguments::parse_options_environment_variable(const char* name,
3163 ScopedVMInitArgs* vm_args) {
3164 char *buffer = ::getenv(name);
3165
3166 // Don't check this environment variable if user has special privileges
3167 // (e.g. unix su command).
3168 if (buffer == nullptr || os::have_special_privileges()) {
3169 return JNI_OK;
3170 }
3171
3172 if ((buffer = os::strdup(buffer)) == nullptr) {
3173 return JNI_ENOMEM;
3174 }
3175
3176 jio_fprintf(defaultStream::error_stream(),
3177 "Picked up %s: %s\n", name, buffer);
3178
3179 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3180
3181 os::free(buffer);
3182 return retcode;
3183 }
3184
3185 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3186 // read file into buffer
3187 int fd = ::open(file_name, O_RDONLY);
3188 if (fd < 0) {
3189 jio_fprintf(defaultStream::error_stream(),
3190 "Could not open options file '%s'\n",
3191 file_name);
3192 return JNI_ERR;
3193 }
3194
3195 struct stat stbuf;
3196 int retcode = os::stat(file_name, &stbuf);
3197 if (retcode != 0) {
3198 jio_fprintf(defaultStream::error_stream(),
3199 "Could not stat options file '%s'\n",
3200 file_name);
3201 ::close(fd);
3202 return JNI_ERR;
3203 }
3204
3205 if (stbuf.st_size == 0) {
3206 // tell caller there is no option data and that is ok
3207 ::close(fd);
3208 return JNI_OK;
3209 }
3210
3211 // '+ 1' for null termination even with max bytes
3212 size_t bytes_alloc = stbuf.st_size + 1;
3213
3214 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3215 if (nullptr == buf) {
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Could not allocate read buffer for options file parse\n");
3218 ::close(fd);
3219 return JNI_ENOMEM;
3220 }
3221
3222 memset(buf, 0, bytes_alloc);
3223
3224 // Fill buffer
3225 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3226 ::close(fd);
3227 if (bytes_read < 0) {
3228 FREE_C_HEAP_ARRAY(char, buf);
3229 jio_fprintf(defaultStream::error_stream(),
3230 "Could not read options file '%s'\n", file_name);
3231 return JNI_ERR;
3232 }
3233
3234 if (bytes_read == 0) {
3235 // tell caller there is no option data and that is ok
3236 FREE_C_HEAP_ARRAY(char, buf);
3237 return JNI_OK;
3238 }
3239
3240 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3241
3242 FREE_C_HEAP_ARRAY(char, buf);
3243 return retcode;
3244 }
3245
3246 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3247 // Construct option array
3248 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3249
3250 // some pointers to help with parsing
3251 char *buffer_end = buffer + buf_len;
3252 char *opt_hd = buffer;
3253 char *wrt = buffer;
3254 char *rd = buffer;
3255
3256 // parse all options
3257 while (rd < buffer_end) {
3258 // skip leading white space from the input string
3259 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3260 rd++;
3261 }
3262
3263 if (rd >= buffer_end) {
3264 break;
3265 }
3266
3267 // Remember this is where we found the head of the token.
3268 opt_hd = wrt;
3269
3270 // Tokens are strings of non white space characters separated
3271 // by one or more white spaces.
3272 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3273 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3274 int quote = *rd; // matching quote to look for
3275 rd++; // don't copy open quote
3276 while (rd < buffer_end && *rd != quote) {
3277 // include everything (even spaces)
3278 // up until the close quote
3279 *wrt++ = *rd++; // copy to option string
3280 }
3281
3282 if (rd < buffer_end) {
3283 rd++; // don't copy close quote
3284 } else {
3285 // did not see closing quote
3286 jio_fprintf(defaultStream::error_stream(),
3287 "Unmatched quote in %s\n", name);
3288 return JNI_ERR;
3289 }
3290 } else {
3291 *wrt++ = *rd++; // copy to option string
3292 }
3293 }
3294
3295 // steal a white space character and set it to null
3296 *wrt++ = '\0';
3297 // We now have a complete token
3298
3299 JavaVMOption option;
3300 option.optionString = opt_hd;
3301 option.extraInfo = nullptr;
3302
3303 options.append(option); // Fill in option
3304
3305 rd++; // Advance to next character
3306 }
3307
3308 // Fill out JavaVMInitArgs structure.
3309 return vm_args->set_args(&options);
3310 }
3311
3312 #ifndef PRODUCT
3313 // Determine whether LogVMOutput should be implicitly turned on.
3314 static bool use_vm_log() {
3315 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3316 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3317 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3318 PrintAssembly || TraceDeoptimization ||
3319 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3320 return true;
3321 }
3322
3323 #ifdef COMPILER1
3324 if (PrintC1Statistics) {
3325 return true;
3326 }
3327 #endif // COMPILER1
3328
3329 #ifdef COMPILER2
3330 if (PrintOptoAssembly || PrintOptoStatistics) {
3331 return true;
3332 }
3333 #endif // COMPILER2
3334
3335 return false;
3336 }
3337
3338 #endif // PRODUCT
3339
3340 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3341 for (int index = 0; index < args->nOptions; index++) {
3342 const JavaVMOption* option = args->options + index;
3343 const char* tail;
3344 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3345 return true;
3346 }
3347 }
3348 return false;
3349 }
3350
3351 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3352 const char* vm_options_file,
3353 const int vm_options_file_pos,
3354 ScopedVMInitArgs* vm_options_file_args,
3355 ScopedVMInitArgs* args_out) {
3356 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3357 if (code != JNI_OK) {
3358 return code;
3359 }
3360
3361 if (vm_options_file_args->get()->nOptions < 1) {
3362 return JNI_OK;
3363 }
3364
3365 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3366 jio_fprintf(defaultStream::error_stream(),
3367 "A VM options file may not refer to a VM options file. "
3368 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3369 "options file '%s' in options container '%s' is an error.\n",
3370 vm_options_file_args->vm_options_file_arg(),
3371 vm_options_file_args->container_name());
3372 return JNI_EINVAL;
3373 }
3374
3375 return args_out->insert(args, vm_options_file_args->get(),
3376 vm_options_file_pos);
3377 }
3378
3379 // Expand -XX:VMOptionsFile found in args_in as needed.
3380 // mod_args and args_out parameters may return values as needed.
3381 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3382 ScopedVMInitArgs* mod_args,
3383 JavaVMInitArgs** args_out) {
3384 jint code = match_special_option_and_act(args_in, mod_args);
3385 if (code != JNI_OK) {
3386 return code;
3387 }
3388
3389 if (mod_args->is_set()) {
3390 // args_in contains -XX:VMOptionsFile and mod_args contains the
3391 // original options from args_in along with the options expanded
3392 // from the VMOptionsFile. Return a short-hand to the caller.
3393 *args_out = mod_args->get();
3394 } else {
3395 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3396 }
3397 return JNI_OK;
3398 }
3399
3400 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3401 ScopedVMInitArgs* args_out) {
3402 // Remaining part of option string
3403 const char* tail;
3404 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3405
3406 for (int index = 0; index < args->nOptions; index++) {
3407 const JavaVMOption* option = args->options + index;
3408 if (match_option(option, "-XX:Flags=", &tail)) {
3409 Arguments::set_jvm_flags_file(tail);
3410 continue;
3411 }
3412 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3413 if (vm_options_file_args.found_vm_options_file_arg()) {
3414 jio_fprintf(defaultStream::error_stream(),
3415 "The option '%s' is already specified in the options "
3416 "container '%s' so the specification of '%s' in the "
3417 "same options container is an error.\n",
3418 vm_options_file_args.vm_options_file_arg(),
3419 vm_options_file_args.container_name(),
3420 option->optionString);
3421 return JNI_EINVAL;
3422 }
3423 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3424 // If there's a VMOptionsFile, parse that
3425 jint code = insert_vm_options_file(args, tail, index,
3426 &vm_options_file_args, args_out);
3427 if (code != JNI_OK) {
3428 return code;
3429 }
3430 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3431 if (args_out->is_set()) {
3432 // The VMOptions file inserted some options so switch 'args'
3433 // to the new set of options, and continue processing which
3434 // preserves "last option wins" semantics.
3435 args = args_out->get();
3436 // The first option from the VMOptionsFile replaces the
3437 // current option. So we back track to process the
3438 // replacement option.
3439 index--;
3440 }
3441 continue;
3442 }
3443 if (match_option(option, "-XX:+PrintVMOptions")) {
3444 PrintVMOptions = true;
3445 continue;
3446 }
3447 if (match_option(option, "-XX:-PrintVMOptions")) {
3448 PrintVMOptions = false;
3449 continue;
3450 }
3451 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3452 IgnoreUnrecognizedVMOptions = true;
3453 continue;
3454 }
3455 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3456 IgnoreUnrecognizedVMOptions = false;
3457 continue;
3458 }
3459 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3460 JVMFlag::printFlags(tty, false);
3461 vm_exit(0);
3462 }
3463
3464 #ifndef PRODUCT
3465 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3466 JVMFlag::printFlags(tty, true);
3467 vm_exit(0);
3468 }
3469 #endif
3470 }
3471 return JNI_OK;
3472 }
3473
3474 static void print_options(const JavaVMInitArgs *args) {
3475 const char* tail;
3476 for (int index = 0; index < args->nOptions; index++) {
3477 const JavaVMOption *option = args->options + index;
3478 if (match_option(option, "-XX:", &tail)) {
3479 logOption(tail);
3480 }
3481 }
3482 }
3483
3484 bool Arguments::handle_deprecated_print_gc_flags() {
3485 if (PrintGC) {
3486 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3487 }
3488 if (PrintGCDetails) {
3489 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3490 }
3491
3492 if (_legacyGCLogging.lastFlag == 2) {
3493 // -Xloggc was used to specify a filename
3494 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3495
3496 LogTarget(Error, logging) target;
3497 LogStream errstream(target);
3498 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3499 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3500 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3501 }
3502 return true;
3503 }
3504
3505 static void apply_debugger_ergo() {
3506 #ifdef ASSERT
3507 if (ReplayCompiles) {
3508 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3509 }
3510
3511 if (UseDebuggerErgo) {
3512 // Turn on sub-flags
3513 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3514 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3515 }
3516
3517 if (UseDebuggerErgo2) {
3518 // Debugging with limited number of CPUs
3519 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3520 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3521 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3522 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3523 }
3524 #endif // ASSERT
3525 }
3526
3527 // Parse entry point called from JNI_CreateJavaVM
3528
3529 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3530 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3531 JVMFlag::check_all_flag_declarations();
3532
3533 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3534 const char* hotspotrc = ".hotspotrc";
3535 bool settings_file_specified = false;
3536 bool needs_hotspotrc_warning = false;
3537 ScopedVMInitArgs initial_vm_options_args("");
3538 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3539 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3540
3541 // Pointers to current working set of containers
3542 JavaVMInitArgs* cur_cmd_args;
3543 JavaVMInitArgs* cur_vm_options_args;
3544 JavaVMInitArgs* cur_java_options_args;
3545 JavaVMInitArgs* cur_java_tool_options_args;
3546
3547 // Containers for modified/expanded options
3548 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3549 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3550 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3551 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3552
3553
3554 jint code =
3555 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3556 if (code != JNI_OK) {
3557 return code;
3558 }
3559
3560 code = parse_java_options_environment_variable(&initial_java_options_args);
3561 if (code != JNI_OK) {
3562 return code;
3563 }
3564
3565 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3566 char *vmoptions = ClassLoader::lookup_vm_options();
3567 if (vmoptions != nullptr) {
3568 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3569 FREE_C_HEAP_ARRAY(char, vmoptions);
3570 if (code != JNI_OK) {
3571 return code;
3572 }
3573 }
3574
3575 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3576 &mod_java_tool_options_args,
3577 &cur_java_tool_options_args);
3578 if (code != JNI_OK) {
3579 return code;
3580 }
3581
3582 code = expand_vm_options_as_needed(initial_cmd_args,
3583 &mod_cmd_args,
3584 &cur_cmd_args);
3585 if (code != JNI_OK) {
3586 return code;
3587 }
3588
3589 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3590 &mod_java_options_args,
3591 &cur_java_options_args);
3592 if (code != JNI_OK) {
3593 return code;
3594 }
3595
3596 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3597 &mod_vm_options_args,
3598 &cur_vm_options_args);
3599 if (code != JNI_OK) {
3600 return code;
3601 }
3602
3603 const char* flags_file = Arguments::get_jvm_flags_file();
3604 settings_file_specified = (flags_file != nullptr);
3605
3606 if (IgnoreUnrecognizedVMOptions) {
3607 cur_cmd_args->ignoreUnrecognized = true;
3608 cur_java_tool_options_args->ignoreUnrecognized = true;
3609 cur_java_options_args->ignoreUnrecognized = true;
3610 }
3611
3612 // Parse specified settings file
3613 if (settings_file_specified) {
3614 if (!process_settings_file(flags_file, true,
3615 cur_cmd_args->ignoreUnrecognized)) {
3616 return JNI_EINVAL;
3617 }
3618 } else {
3619 #ifdef ASSERT
3620 // Parse default .hotspotrc settings file
3621 if (!process_settings_file(".hotspotrc", false,
3622 cur_cmd_args->ignoreUnrecognized)) {
3623 return JNI_EINVAL;
3624 }
3625 #else
3626 struct stat buf;
3627 if (os::stat(hotspotrc, &buf) == 0) {
3628 needs_hotspotrc_warning = true;
3629 }
3630 #endif
3631 }
3632
3633 if (PrintVMOptions) {
3634 print_options(cur_java_tool_options_args);
3635 print_options(cur_cmd_args);
3636 print_options(cur_java_options_args);
3637 }
3638
3639 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3640 jint result = parse_vm_init_args(cur_vm_options_args,
3641 cur_java_tool_options_args,
3642 cur_java_options_args,
3643 cur_cmd_args);
3644
3645 if (result != JNI_OK) {
3646 return result;
3647 }
3648
3649 // Delay warning until here so that we've had a chance to process
3650 // the -XX:-PrintWarnings flag
3651 if (needs_hotspotrc_warning) {
3652 warning("%s file is present but has been ignored. "
3653 "Run with -XX:Flags=%s to load the file.",
3654 hotspotrc, hotspotrc);
3655 }
3656
3657 if (needs_module_property_warning) {
3658 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3659 " names that are reserved for internal use.");
3660 }
3661
3662 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3663 UNSUPPORTED_OPTION(UseLargePages);
3664 #endif
3665
3666 #if defined(AIX)
3667 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3668 #endif
3669
3670 #ifndef PRODUCT
3671 if (TraceBytecodesAt != 0) {
3672 TraceBytecodes = true;
3673 }
3674 #endif // PRODUCT
3675
3676 if (ScavengeRootsInCode == 0) {
3677 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3678 warning("Forcing ScavengeRootsInCode non-zero");
3679 }
3680 ScavengeRootsInCode = 1;
3681 }
3682
3683 if (!handle_deprecated_print_gc_flags()) {
3684 return JNI_EINVAL;
3685 }
3686
3687 // Set object alignment values.
3688 set_object_alignment();
3689
3690 #if !INCLUDE_CDS
3691 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3692 jio_fprintf(defaultStream::error_stream(),
3693 "Shared spaces are not supported in this VM\n");
3694 return JNI_ERR;
3695 }
3696 if (DumpLoadedClassList != nullptr) {
3697 jio_fprintf(defaultStream::error_stream(),
3698 "DumpLoadedClassList is not supported in this VM\n");
3699 return JNI_ERR;
3700 }
3701 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3702 log_is_enabled(Info, cds)) {
3703 warning("Shared spaces are not supported in this VM");
3704 UseSharedSpaces = false;
3705 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3706 }
3707 no_shared_spaces("CDS Disabled");
3708 #endif // INCLUDE_CDS
3709
3710 // Verify NMT arguments
3711 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3712 if (lvl == NMT_unknown) {
3713 jio_fprintf(defaultStream::error_stream(),
3714 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3715 return JNI_ERR;
3716 }
3717 if (PrintNMTStatistics && lvl == NMT_off) {
3718 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3719 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3720 }
3721
3722 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3723 if (trace_dependencies && VerifyDependencies) {
3724 warning("dependency logging results may be inflated by VerifyDependencies");
3725 }
3726
3727 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3728 log_is_enabled(Info, class, load, cause);
3729 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3730 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3731 }
3732
3733 apply_debugger_ergo();
3734
3735 // The VMThread needs to stop now and then to execute these debug options.
3736 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3737 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3738 }
3739
3740 if (log_is_enabled(Info, arguments)) {
3741 LogStream st(Log(arguments)::info());
3742 Arguments::print_on(&st);
3743 }
3744
3745 return JNI_OK;
3746 }
3747
3748 void Arguments::set_compact_headers_flags() {
3749 #ifdef _LP64
3750 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3751 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3752 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3753 }
3754 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3755 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3756 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3757 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3758
3759 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3760 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3761 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3762 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3763 } else {
3764 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3765 }
3766 }
3767 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3768 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3769 }
3770 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3771 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3772 }
3773 #endif
3774 }
3775
3776 jint Arguments::apply_ergo() {
3777 // Set flags based on ergonomics.
3778 jint result = set_ergonomics_flags();
3779 if (result != JNI_OK) return result;
3780
3781 // Set heap size based on available physical memory
3782 set_heap_size();
3783
3784 GCConfig::arguments()->initialize();
3785
3786 set_compact_headers_flags();
3787
3788 if (UseCompressedClassPointers) {
3789 CompressedKlassPointers::pre_initialize();
3790 }
3791
3792 CDSConfig::initialize();
3793
3794 // Initialize Metaspace flags and alignments
3795 Metaspace::ergo_initialize();
3796
3797 if (!StringDedup::ergo_initialize()) {
3798 return JNI_EINVAL;
3799 }
3800
3801 // Set compiler flags after GC is selected and GC specific
3802 // flags (LoopStripMiningIter) are set.
3803 CompilerConfig::ergo_initialize();
3804
3805 // Set bytecode rewriting flags
3806 set_bytecode_flags();
3807
3808 // Set flags if aggressive optimization flags are enabled
3809 jint code = set_aggressive_opts_flags();
3810 if (code != JNI_OK) {
3811 return code;
3812 }
3813
3814 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3815 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3816 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3817 warning("UseSecondarySupersTable is not supported");
3818 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3819 }
3820 if (!UseSecondarySupersTable) {
3821 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3822 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3823 }
3824
3825 #ifdef ZERO
3826 // Clear flags not supported on zero.
3827 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3828 #endif // ZERO
3829
3830 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3831 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3832 DebugNonSafepoints = true;
3833 }
3834
3835 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3836 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3837 }
3838
3839 // Treat the odd case where local verification is enabled but remote
3840 // verification is not as if both were enabled.
3841 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3842 log_info(verification)("Turning on remote verification because local verification is on");
3843 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3844 }
3845 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3846 // Disable calling convention optimizations if inline types are not supported.
3847 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3848 // the CDS archive, as the values must match between dumptime and runtime.
3849 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3850 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3851 }
3852 if (!UseNonAtomicValueFlattening && !UseNullableValueFlattening && !UseAtomicValueFlattening) {
3853 // Flattening is disabled
3854 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3855 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3856 }
3857
3858 #ifndef PRODUCT
3859 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3860 if (use_vm_log()) {
3861 LogVMOutput = true;
3862 }
3863 }
3864 #endif // PRODUCT
3865
3866 if (PrintCommandLineFlags) {
3867 JVMFlag::printSetFlags(tty);
3868 }
3869
3870 #if COMPILER2_OR_JVMCI
3871 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3872 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3873 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3874 }
3875 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3876
3877 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3878 if (!EnableVectorReboxing) {
3879 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3880 } else {
3881 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3882 }
3883 }
3884 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3885
3886 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3887 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3888 }
3889 FLAG_SET_DEFAULT(UseVectorStubs, false);
3890 }
3891 #endif // COMPILER2_OR_JVMCI
3892
3893 #ifdef COMPILER2
3894 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3895 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3896 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3897 }
3898 #endif // COMPILER2
3899
3900 if (log_is_enabled(Info, perf, class, link)) {
3901 if (!UsePerfData) {
3902 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3903 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3904 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3905 }
3906 }
3907
3908 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3909 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3910 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3911 }
3912 }
3913 return JNI_OK;
3914 }
3915
3916 jint Arguments::adjust_after_os() {
3917 if (UseNUMA) {
3918 if (UseParallelGC) {
3919 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3920 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3921 }
3922 }
3923 }
3924 return JNI_OK;
3925 }
3926
3927 int Arguments::PropertyList_count(SystemProperty* pl) {
3928 int count = 0;
3929 while(pl != nullptr) {
3930 count++;
3931 pl = pl->next();
3932 }
3933 return count;
3934 }
3935
3936 // Return the number of readable properties.
3937 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3938 int count = 0;
3939 while(pl != nullptr) {
3940 if (pl->readable()) {
3941 count++;
3942 }
3943 pl = pl->next();
3944 }
3945 return count;
3946 }
3947
3948 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3949 assert(key != nullptr, "just checking");
3950 SystemProperty* prop;
3951 for (prop = pl; prop != nullptr; prop = prop->next()) {
3952 if (strcmp(key, prop->key()) == 0) return prop->value();
3953 }
3954 return nullptr;
3955 }
3956
3957 // Return the value of the requested property provided that it is a readable property.
3958 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3959 assert(key != nullptr, "just checking");
3960 SystemProperty* prop;
3961 // Return the property value if the keys match and the property is not internal or
3962 // it's the special internal property "jdk.boot.class.path.append".
3963 for (prop = pl; prop != nullptr; prop = prop->next()) {
3964 if (strcmp(key, prop->key()) == 0) {
3965 if (!prop->internal()) {
3966 return prop->value();
3967 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3968 return prop->value();
3969 } else {
3970 // Property is internal and not jdk.boot.class.path.append so return null.
3971 return nullptr;
3972 }
3973 }
3974 }
3975 return nullptr;
3976 }
3977
3978 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3979 SystemProperty* p = *plist;
3980 if (p == nullptr) {
3981 *plist = new_p;
3982 } else {
3983 while (p->next() != nullptr) {
3984 p = p->next();
3985 }
3986 p->set_next(new_p);
3987 }
3988 }
3989
3990 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3991 bool writeable, bool internal) {
3992 if (plist == nullptr)
3993 return;
3994
3995 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3996 PropertyList_add(plist, new_p);
3997 }
3998
3999 void Arguments::PropertyList_add(SystemProperty *element) {
4000 PropertyList_add(&_system_properties, element);
4001 }
4002
4003 // This add maintains unique property key in the list.
4004 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4005 PropertyAppendable append, PropertyWriteable writeable,
4006 PropertyInternal internal) {
4007 if (plist == nullptr)
4008 return;
4009
4010 // If property key exists and is writeable, then update with new value.
4011 // Trying to update a non-writeable property is silently ignored.
4012 SystemProperty* prop;
4013 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4014 if (strcmp(k, prop->key()) == 0) {
4015 if (append == AppendProperty) {
4016 prop->append_writeable_value(v);
4017 } else {
4018 prop->set_writeable_value(v);
4019 }
4020 return;
4021 }
4022 }
4023
4024 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4025 }
4026
4027 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4028 // Returns true if all of the source pointed by src has been copied over to
4029 // the destination buffer pointed by buf. Otherwise, returns false.
4030 // Notes:
4031 // 1. If the length (buflen) of the destination buffer excluding the
4032 // null terminator character is not long enough for holding the expanded
4033 // pid characters, it also returns false instead of returning the partially
4034 // expanded one.
4035 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4036 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4037 char* buf, size_t buflen) {
4038 const char* p = src;
4039 char* b = buf;
4040 const char* src_end = &src[srclen];
4041 char* buf_end = &buf[buflen - 1];
4042
4043 while (p < src_end && b < buf_end) {
4044 if (*p == '%') {
4045 switch (*(++p)) {
4046 case '%': // "%%" ==> "%"
4047 *b++ = *p++;
4048 break;
4049 case 'p': { // "%p" ==> current process id
4050 // buf_end points to the character before the last character so
4051 // that we could write '\0' to the end of the buffer.
4052 size_t buf_sz = buf_end - b + 1;
4053 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4054
4055 // if jio_snprintf fails or the buffer is not long enough to hold
4056 // the expanded pid, returns false.
4057 if (ret < 0 || ret >= (int)buf_sz) {
4058 return false;
4059 } else {
4060 b += ret;
4061 assert(*b == '\0', "fail in copy_expand_pid");
4062 if (p == src_end && b == buf_end + 1) {
4063 // reach the end of the buffer.
4064 return true;
4065 }
4066 }
4067 p++;
4068 break;
4069 }
4070 default :
4071 *b++ = '%';
4072 }
4073 } else {
4074 *b++ = *p++;
4075 }
4076 }
4077 *b = '\0';
4078 return (p == src_end); // return false if not all of the source was copied
4079 }