1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "compiler/compilerDefinitions.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/genArguments.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104
105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = nullptr;
111 exit_hook_t Arguments::_exit_hook = nullptr;
112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
116 SystemProperty *Arguments::_java_library_path = nullptr;
117 SystemProperty *Arguments::_java_home = nullptr;
118 SystemProperty *Arguments::_java_class_path = nullptr;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
120 SystemProperty *Arguments::_vm_info = nullptr;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
123 PathString *Arguments::_boot_class_path = nullptr;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = nullptr;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 // True if -Xint/-Xmixed/-Xcomp were specified
132 static bool mode_flag_cmd_line = false;
133
134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
136 if (new_value == nullptr) {
137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
138 return false;
139 }
140 if (_value != nullptr) {
141 FreeHeap(_value);
142 }
143 _value = new_value;
144 strcpy(_value, value);
145 return true;
146 }
147
148 void PathString::append_value(const char *value) {
149 char *sp;
150 size_t len = 0;
151 if (value != nullptr) {
152 len = strlen(value);
153 if (_value != nullptr) {
154 len += strlen(_value);
155 }
156 sp = AllocateHeap(len+2, mtArguments);
157 assert(sp != nullptr, "Unable to allocate space for new append path value");
158 if (sp != nullptr) {
159 if (_value != nullptr) {
160 strcpy(sp, _value);
161 strcat(sp, os::path_separator());
162 strcat(sp, value);
163 FreeHeap(_value);
164 } else {
165 strcpy(sp, value);
166 }
167 _value = sp;
168 }
169 }
170 }
171
172 PathString::PathString(const char* value) {
173 if (value == nullptr) {
174 _value = nullptr;
175 } else {
176 _value = AllocateHeap(strlen(value)+1, mtArguments);
177 strcpy(_value, value);
178 }
179 }
180
181 PathString::~PathString() {
182 if (_value != nullptr) {
183 FreeHeap(_value);
184 _value = nullptr;
185 }
186 }
187
188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
190 size_t len = strlen(module_name) + 1;
191 _module_name = AllocateHeap(len, mtInternal);
192 strncpy(_module_name, module_name, len); // copy the trailing null
193 _path = new PathString(path);
194 }
195
196 ModulePatchPath::~ModulePatchPath() {
197 if (_module_name != nullptr) {
198 FreeHeap(_module_name);
199 _module_name = nullptr;
200 }
201 if (_path != nullptr) {
202 delete _path;
203 _path = nullptr;
204 }
205 }
206
207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
208 if (key == nullptr) {
209 _key = nullptr;
210 } else {
211 _key = AllocateHeap(strlen(key)+1, mtArguments);
212 strcpy(_key, key);
213 }
214 _next = nullptr;
215 _internal = internal;
216 _writeable = writeable;
217 }
218
219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220 // part of the option string.
221 static bool match_option(const JavaVMOption *option, const char* name,
222 const char** tail) {
223 size_t len = strlen(name);
224 if (strncmp(option->optionString, name, len) == 0) {
225 *tail = option->optionString + len;
226 return true;
227 } else {
228 return false;
229 }
230 }
231
232 // Check if 'option' matches 'name'. No "tail" is allowed.
233 static bool match_option(const JavaVMOption *option, const char* name) {
234 const char* tail = nullptr;
235 bool result = match_option(option, name, &tail);
236 if (tail != nullptr && *tail == '\0') {
237 return result;
238 } else {
239 return false;
240 }
241 }
242
243 // Return true if any of the strings in null-terminated array 'names' matches.
244 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
245 // the option must match exactly.
246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
247 bool tail_allowed) {
248 for (/* empty */; *names != nullptr; ++names) {
249 if (match_option(option, *names, tail)) {
250 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
251 return true;
252 }
253 }
254 }
255 return false;
256 }
257
258 #if INCLUDE_JFR
259 static bool _has_jfr_option = false; // is using JFR
260
261 // return true on failure
262 static bool match_jfr_option(const JavaVMOption** option) {
263 assert((*option)->optionString != nullptr, "invariant");
264 char* tail = nullptr;
265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
266 _has_jfr_option = true;
267 return Jfr::on_start_flight_recording_option(option, tail);
268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_flight_recorder_option(option, tail);
271 }
272 return false;
273 }
274
275 bool Arguments::has_jfr_option() {
276 return _has_jfr_option;
277 }
278 #endif
279
280 static void logOption(const char* opt) {
281 if (PrintVMOptions) {
282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
283 }
284 }
285
286 bool needs_module_property_warning = false;
287
288 #define MODULE_PROPERTY_PREFIX "jdk.module."
289 #define MODULE_PROPERTY_PREFIX_LEN 11
290 #define ADDEXPORTS "addexports"
291 #define ADDEXPORTS_LEN 10
292 #define ADDREADS "addreads"
293 #define ADDREADS_LEN 8
294 #define ADDOPENS "addopens"
295 #define ADDOPENS_LEN 8
296 #define PATCH "patch"
297 #define PATCH_LEN 5
298 #define ADDMODS "addmods"
299 #define ADDMODS_LEN 7
300 #define LIMITMODS "limitmods"
301 #define LIMITMODS_LEN 9
302 #define PATH "path"
303 #define PATH_LEN 4
304 #define UPGRADE_PATH "upgrade.path"
305 #define UPGRADE_PATH_LEN 12
306 #define ENABLE_NATIVE_ACCESS "enable.native.access"
307 #define ENABLE_NATIVE_ACCESS_LEN 20
308
309 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
310 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
311 return ((strncmp(option, property, len) == 0) &&
312 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
313 }
314
315 // Return true if property starts with "jdk.module." and its ensuing chars match
316 // any of the reserved module properties.
317 // property should be passed without the leading "-D".
318 bool Arguments::is_internal_module_property(const char* property) {
319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
327 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
330 return true;
331 }
332 }
333 return false;
334 }
335
336 // Process java launcher properties.
337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
339 // Must do this before setting up other system properties,
340 // as some of them may depend on launcher type.
341 for (int index = 0; index < args->nOptions; index++) {
342 const JavaVMOption* option = args->options + index;
343 const char* tail;
344
345 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
346 process_java_launcher_argument(tail, option->extraInfo);
347 continue;
348 }
349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
350 if (strcmp(tail, "true") == 0) {
351 _sun_java_launcher_is_altjvm = true;
352 }
353 continue;
354 }
355 }
356 }
357
358 // Initialize system properties key and value.
359 void Arguments::init_system_properties() {
360
361 // Set up _boot_class_path which is not a property but
362 // relies heavily on argument processing and the jdk.boot.class.path.append
363 // property. It is used to store the underlying boot class path.
364 _boot_class_path = new PathString(nullptr);
365
366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
367 "Java Virtual Machine Specification", false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
371
372 // Initialize the vm.info now, but it will need updating after argument parsing.
373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
374
375 // Following are JVMTI agent writable properties.
376 // Properties values are set to nullptr and they are
377 // os specific they are initialized in os::init_system_properties_values().
378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
379 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
380 _java_home = new SystemProperty("java.home", nullptr, true);
381 _java_class_path = new SystemProperty("java.class.path", "", true);
382 // jdk.boot.class.path.append is a non-writeable, internal property.
383 // It can only be set by either:
384 // - -Xbootclasspath/a:
385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
387
388 // Add to System Property list.
389 PropertyList_add(&_system_properties, _sun_boot_library_path);
390 PropertyList_add(&_system_properties, _java_library_path);
391 PropertyList_add(&_system_properties, _java_home);
392 PropertyList_add(&_system_properties, _java_class_path);
393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
394 PropertyList_add(&_system_properties, _vm_info);
395
396 // Set OS specific system properties values
397 os::init_system_properties_values();
398 }
399
400 // Update/Initialize System properties after JDK version number is known
401 void Arguments::init_version_specific_system_properties() {
402 enum { bufsz = 16 };
403 char buffer[bufsz];
404 const char* spec_vendor = "Oracle Corporation";
405 uint32_t spec_version = JDK_Version::current().major_version();
406
407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
408
409 PropertyList_add(&_system_properties,
410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
411 PropertyList_add(&_system_properties,
412 new SystemProperty("java.vm.specification.version", buffer, false));
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
415 }
416
417 /*
418 * -XX argument processing:
419 *
420 * -XX arguments are defined in several places, such as:
421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
422 * -XX arguments are parsed in parse_argument().
423 * -XX argument bounds checking is done in check_vm_args_consistency().
424 *
425 * Over time -XX arguments may change. There are mechanisms to handle common cases:
426 *
427 * ALIASED: An option that is simply another name for another option. This is often
428 * part of the process of deprecating a flag, but not all aliases need
429 * to be deprecated.
430 *
431 * Create an alias for an option by adding the old and new option names to the
432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
433 *
434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
435 * support may be removed in the future. Both regular and aliased options may be
436 * deprecated.
437 *
438 * Add a deprecation warning for an option (or alias) by adding an entry in the
439 * "special_jvm_flags" table and setting the "deprecated_in" field.
440 * Often an option "deprecated" in one major release will
441 * be made "obsolete" in the next. In this case the entry should also have its
442 * "obsolete_in" field set.
443 *
444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
445 * on the command line. A warning is printed to let the user know that option might not
446 * be accepted in the future.
447 *
448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
449 * table and setting the "obsolete_in" field.
450 *
451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
452 * to the current JDK version. The system will flatly refuse to admit the existence of
453 * the flag. This allows a flag to die automatically over JDK releases.
454 *
455 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
457 * - Newly obsolete or expired deprecated options should have their global variable
458 * definitions removed (from globals.hpp, etc) and related implementations removed.
459 *
460 * Recommended approach for removing options:
461 *
462 * To remove options commonly used by customers (e.g. product -XX options), use
463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
464 *
465 * To remove internal options (e.g. diagnostic, experimental, develop options), use
466 * a 2-step model adding major release numbers to the obsolete and expire columns.
467 *
468 * To change the name of an option, use the alias table as well as a 2-step
469 * model adding major release numbers to the deprecate and expire columns.
470 * Think twice about aliasing commonly used customer options.
471 *
472 * There are times when it is appropriate to leave a future release number as undefined.
473 *
474 * Tests: Aliases should be tested in VMAliasOptions.java.
475 * Deprecated options should be tested in VMDeprecatedOptions.java.
476 */
477
478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
481 // the command-line as usual, but will issue a warning.
482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
483 // the command-line, while issuing a warning and ignoring the flag value.
484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
485 // existence of the flag.
486 //
487 // MANUAL CLEANUP ON JDK VERSION UPDATES:
488 // This table ensures that the handling of options will update automatically when the JDK
489 // version is incremented, but the source code needs to be cleanup up manually:
490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
491 // variable should be removed, as well as users of the variable.
492 // - As "deprecated" options age into "obsolete" options, move the entry into the
493 // "Obsolete Flags" section of the table.
494 // - All expired options should be removed from the table.
495 static SpecialFlag const special_jvm_flags[] = {
496 // -------------- Deprecated Flags --------------
497 // --- Non-alias flags - sorted by obsolete_in then expired_in:
498 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
502 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
503 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
504 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
505 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
506 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
507 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
508 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
509 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
510 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
511
512 // -------------- Obsolete Flags - sorted by expired_in --------------
513
514 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
515
516 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
517 #if defined(X86)
518 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
519 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
520 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
521 #endif // X86
522
523 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
524 #ifdef ASSERT
525 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
526 #endif
527
528 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
529 // These entries will generate build errors. Their purpose is to test the macros.
530 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
531 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
532 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
533 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
534 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
535 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
537 #endif
538
539 { nullptr, JDK_Version(0), JDK_Version(0) }
540 };
541
542 // Flags that are aliases for other flags.
543 typedef struct {
544 const char* alias_name;
545 const char* real_name;
546 } AliasedFlag;
547
548 static AliasedFlag const aliased_jvm_flags[] = {
549 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
550 { nullptr, nullptr}
551 };
552
553 // Return true if "v" is less than "other", where "other" may be "undefined".
554 static bool version_less_than(JDK_Version v, JDK_Version other) {
555 assert(!v.is_undefined(), "must be defined");
556 if (!other.is_undefined() && v.compare(other) >= 0) {
557 return false;
558 } else {
559 return true;
560 }
561 }
562
563 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
564 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
565 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
566 flag = special_jvm_flags[i];
567 return true;
568 }
569 }
570 return false;
571 }
572
573 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
574 assert(version != nullptr, "Must provide a version buffer");
575 SpecialFlag flag;
576 if (lookup_special_flag(flag_name, flag)) {
577 if (!flag.obsolete_in.is_undefined()) {
578 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
579 *version = flag.obsolete_in;
580 // This flag may have been marked for obsoletion in this version, but we may not
581 // have actually removed it yet. Rather than ignoring it as soon as we reach
582 // this version we allow some time for the removal to happen. So if the flag
583 // still actually exists we process it as normal, but issue an adjusted warning.
584 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
585 if (real_flag != nullptr) {
586 char version_str[256];
587 version->to_string(version_str, sizeof(version_str));
588 warning("Temporarily processing option %s; support is scheduled for removal in %s",
589 flag_name, version_str);
590 return false;
591 }
592 return true;
593 }
594 }
595 }
596 return false;
597 }
598
599 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
600 assert(version != nullptr, "Must provide a version buffer");
601 SpecialFlag flag;
602 if (lookup_special_flag(flag_name, flag)) {
603 if (!flag.deprecated_in.is_undefined()) {
604 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
605 version_less_than(JDK_Version::current(), flag.expired_in)) {
606 *version = flag.deprecated_in;
607 return 1;
608 } else {
609 return -1;
610 }
611 }
612 }
613 return 0;
614 }
615
616 const char* Arguments::real_flag_name(const char *flag_name) {
617 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
618 const AliasedFlag& flag_status = aliased_jvm_flags[i];
619 if (strcmp(flag_status.alias_name, flag_name) == 0) {
620 return flag_status.real_name;
621 }
622 }
623 return flag_name;
624 }
625
626 #ifdef ASSERT
627 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
628 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
629 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
630 return true;
631 }
632 }
633 return false;
634 }
635
636 // Verifies the correctness of the entries in the special_jvm_flags table.
637 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
638 // version being earlier than the deprecation version, then a warning is issued
639 // and verification fails - by returning false. If it is detected that the table
640 // is out of date, with respect to the current version, then ideally a warning is
641 // issued but verification does not fail. This allows the VM to operate when the
642 // version is first updated, without needing to update all the impacted flags at
643 // the same time. In practice we can't issue the warning immediately when the version
644 // is updated as it occurs for every test and some tests are not prepared to handle
645 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
646 // if the check_globals flag is true, and in addition allow a grace period and only
647 // check for stale flags when we hit build 25 (which is far enough into the 6 month
648 // release cycle that all flag updates should have been processed, whilst still
649 // leaving time to make the change before RDP2).
650 // We use a gtest to call this, passing true, so that we can detect stale flags before
651 // the end of the release cycle.
652
653 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
654
655 bool Arguments::verify_special_jvm_flags(bool check_globals) {
656 bool success = true;
657 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
658 const SpecialFlag& flag = special_jvm_flags[i];
659 if (lookup_special_flag(flag.name, i)) {
660 warning("Duplicate special flag declaration \"%s\"", flag.name);
661 success = false;
662 }
663 if (flag.deprecated_in.is_undefined() &&
664 flag.obsolete_in.is_undefined()) {
665 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
666 success = false;
667 }
668
669 if (!flag.deprecated_in.is_undefined()) {
670 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
671 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
672 success = false;
673 }
674
675 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
676 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
677 success = false;
678 }
679 }
680
681 if (!flag.obsolete_in.is_undefined()) {
682 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
683 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
684 success = false;
685 }
686
687 // if flag has become obsolete it should not have a "globals" flag defined anymore.
688 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
689 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
690 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
691 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
692 success = false;
693 }
694 }
695
696 } else if (!flag.expired_in.is_undefined()) {
697 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
698 success = false;
699 }
700
701 if (!flag.expired_in.is_undefined()) {
702 // if flag has become expired 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.expired_in)) {
705 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
706 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
707 success = false;
708 }
709 }
710 }
711 }
712 return success;
713 }
714 #endif
715
716 bool Arguments::atojulong(const char *s, julong* result) {
717 return parse_integer(s, result);
718 }
719
720 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
721 if (size < min_size) return arg_too_small;
722 if (size > max_size) return arg_too_big;
723 return arg_in_range;
724 }
725
726 // Describe an argument out of range error
727 void Arguments::describe_range_error(ArgsRange errcode) {
728 switch(errcode) {
729 case arg_too_big:
730 jio_fprintf(defaultStream::error_stream(),
731 "The specified size exceeds the maximum "
732 "representable size.\n");
733 break;
734 case arg_too_small:
735 case arg_unreadable:
736 case arg_in_range:
737 // do nothing for now
738 break;
739 default:
740 ShouldNotReachHere();
741 }
742 }
743
744 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
745 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
746 return true;
747 } else {
748 return false;
749 }
750 }
751
752 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
753 // strtod allows leading whitespace, but our flag format does not.
754 if (*value == '\0' || isspace((unsigned char) *value)) {
755 return false;
756 }
757 char* end;
758 errno = 0;
759 double v = strtod(value, &end);
760 if ((errno != 0) || (*end != 0)) {
761 return false;
762 }
763 if (g_isnan(v) || !g_isfinite(v)) {
764 // Currently we cannot handle these special values.
765 return false;
766 }
767
768 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
769 return true;
770 }
771 return false;
772 }
773
774 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
775 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
776
777 if (flag->is_int()) {
778 int v;
779 if (parse_integer(value, &v)) {
780 result = JVMFlagAccess::set_int(flag, &v, origin);
781 }
782 } else if (flag->is_uint()) {
783 uint v;
784 if (parse_integer(value, &v)) {
785 result = JVMFlagAccess::set_uint(flag, &v, origin);
786 }
787 } else if (flag->is_intx()) {
788 intx v;
789 if (parse_integer(value, &v)) {
790 result = JVMFlagAccess::set_intx(flag, &v, origin);
791 }
792 } else if (flag->is_uintx()) {
793 uintx v;
794 if (parse_integer(value, &v)) {
795 result = JVMFlagAccess::set_uintx(flag, &v, origin);
796 }
797 } else if (flag->is_uint64_t()) {
798 uint64_t v;
799 if (parse_integer(value, &v)) {
800 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
801 }
802 } else if (flag->is_size_t()) {
803 size_t v;
804 if (parse_integer(value, &v)) {
805 result = JVMFlagAccess::set_size_t(flag, &v, origin);
806 }
807 }
808
809 return result == JVMFlag::SUCCESS;
810 }
811
812 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
813 if (value[0] == '\0') {
814 value = nullptr;
815 }
816 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
817 // Contract: JVMFlag always returns a pointer that needs freeing.
818 FREE_C_HEAP_ARRAY(char, value);
819 return true;
820 }
821
822 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
823 const char* old_value = "";
824 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
825 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
826 size_t new_len = strlen(new_value);
827 const char* value;
828 char* free_this_too = nullptr;
829 if (old_len == 0) {
830 value = new_value;
831 } else if (new_len == 0) {
832 value = old_value;
833 } else {
834 size_t length = old_len + 1 + new_len + 1;
835 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
836 // each new setting adds another LINE to the switch:
837 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
838 value = buf;
839 free_this_too = buf;
840 }
841 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
842 // JVMFlag always returns a pointer that needs freeing.
843 FREE_C_HEAP_ARRAY(char, value);
844 // JVMFlag made its own copy, so I must delete my own temp. buffer.
845 FREE_C_HEAP_ARRAY(char, free_this_too);
846 return true;
847 }
848
849 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
850 const char* real_name = real_flag_name(arg);
851 JDK_Version since = JDK_Version();
852 switch (is_deprecated_flag(arg, &since)) {
853 case -1: {
854 // Obsolete or expired, so don't process normally,
855 // but allow for an obsolete flag we're still
856 // temporarily allowing.
857 if (!is_obsolete_flag(arg, &since)) {
858 return real_name;
859 }
860 // Note if we're not considered obsolete then we can't be expired either
861 // as obsoletion must come first.
862 return nullptr;
863 }
864 case 0:
865 return real_name;
866 case 1: {
867 char version[256];
868 since.to_string(version, sizeof(version));
869 if (real_name != arg) {
870 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
871 arg, version, real_name);
872 } else {
873 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
874 arg, version);
875 }
876 return real_name;
877 }
878 }
879 ShouldNotReachHere();
880 return nullptr;
881 }
882
883 #define BUFLEN 255
884
885 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
886 char name_copied[BUFLEN+1];
887 if (name[name_length] != 0) {
888 if (name_length > BUFLEN) {
889 return nullptr;
890 } else {
891 strncpy(name_copied, name, name_length);
892 name_copied[name_length] = '\0';
893 name = name_copied;
894 }
895 }
896
897 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
898 if (real_name == nullptr) {
899 return nullptr;
900 }
901 JVMFlag* flag = JVMFlag::find_flag(real_name);
902 return flag;
903 }
904
905 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
906 bool is_bool = false;
907 bool bool_val = false;
908 char c = *arg;
909 if (c == '+' || c == '-') {
910 is_bool = true;
911 bool_val = (c == '+');
912 arg++;
913 }
914
915 const char* name = arg;
916 while (true) {
917 c = *arg;
918 if (isalnum(c) || (c == '_')) {
919 ++arg;
920 } else {
921 break;
922 }
923 }
924
925 size_t name_len = size_t(arg - name);
926 if (name_len == 0) {
927 return false;
928 }
929
930 JVMFlag* flag = find_jvm_flag(name, name_len);
931 if (flag == nullptr) {
932 return false;
933 }
934
935 if (is_bool) {
936 if (*arg != 0) {
937 // Error -- extra characters such as -XX:+BoolFlag=123
938 return false;
939 }
940 return set_bool_flag(flag, bool_val, origin);
941 }
942
943 if (arg[0] == '=') {
944 const char* value = arg + 1;
945 if (flag->is_ccstr()) {
946 if (flag->ccstr_accumulates()) {
947 return append_to_string_flag(flag, value, origin);
948 } else {
949 return set_string_flag(flag, value, origin);
950 }
951 } else if (flag->is_double()) {
952 return set_fp_numeric_flag(flag, value, origin);
953 } else {
954 return set_numeric_flag(flag, value, origin);
955 }
956 }
957
958 if (arg[0] == ':' && arg[1] == '=') {
959 // -XX:Foo:=xxx will reset the string flag to the given value.
960 const char* value = arg + 2;
961 return set_string_flag(flag, value, origin);
962 }
963
964 return false;
965 }
966
967 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
968 assert(bldarray != nullptr, "illegal argument");
969
970 if (arg == nullptr) {
971 return;
972 }
973
974 int new_count = *count + 1;
975
976 // expand the array and add arg to the last element
977 if (*bldarray == nullptr) {
978 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
979 } else {
980 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
981 }
982 (*bldarray)[*count] = os::strdup_check_oom(arg);
983 *count = new_count;
984 }
985
986 void Arguments::build_jvm_args(const char* arg) {
987 add_string(&_jvm_args_array, &_num_jvm_args, arg);
988 }
989
990 void Arguments::build_jvm_flags(const char* arg) {
991 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
992 }
993
994 // utility function to return a string that concatenates all
995 // strings in a given char** array
996 const char* Arguments::build_resource_string(char** args, int count) {
997 if (args == nullptr || count == 0) {
998 return nullptr;
999 }
1000 size_t length = 0;
1001 for (int i = 0; i < count; i++) {
1002 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1003 }
1004 char* s = NEW_RESOURCE_ARRAY(char, length);
1005 char* dst = s;
1006 for (int j = 0; j < count; j++) {
1007 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1008 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1009 dst += offset;
1010 length -= offset;
1011 }
1012 return (const char*) s;
1013 }
1014
1015 void Arguments::print_on(outputStream* st) {
1016 st->print_cr("VM Arguments:");
1017 if (num_jvm_flags() > 0) {
1018 st->print("jvm_flags: "); print_jvm_flags_on(st);
1019 st->cr();
1020 }
1021 if (num_jvm_args() > 0) {
1022 st->print("jvm_args: "); print_jvm_args_on(st);
1023 st->cr();
1024 }
1025 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1026 if (_java_class_path != nullptr) {
1027 char* path = _java_class_path->value();
1028 size_t len = strlen(path);
1029 st->print("java_class_path (initial): ");
1030 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1031 if (len == 0) {
1032 st->print_raw_cr("<not set>");
1033 } else {
1034 st->print_raw_cr(path, len);
1035 }
1036 }
1037 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1038 }
1039
1040 void Arguments::print_summary_on(outputStream* st) {
1041 // Print the command line. Environment variables that are helpful for
1042 // reproducing the problem are written later in the hs_err file.
1043 // flags are from setting file
1044 if (num_jvm_flags() > 0) {
1045 st->print_raw("Settings File: ");
1046 print_jvm_flags_on(st);
1047 st->cr();
1048 }
1049 // args are the command line and environment variable arguments.
1050 st->print_raw("Command Line: ");
1051 if (num_jvm_args() > 0) {
1052 print_jvm_args_on(st);
1053 }
1054 // this is the classfile and any arguments to the java program
1055 if (java_command() != nullptr) {
1056 st->print("%s", java_command());
1057 }
1058 st->cr();
1059 }
1060
1061 void Arguments::print_jvm_flags_on(outputStream* st) {
1062 if (_num_jvm_flags > 0) {
1063 for (int i=0; i < _num_jvm_flags; i++) {
1064 st->print("%s ", _jvm_flags_array[i]);
1065 }
1066 }
1067 }
1068
1069 void Arguments::print_jvm_args_on(outputStream* st) {
1070 if (_num_jvm_args > 0) {
1071 for (int i=0; i < _num_jvm_args; i++) {
1072 st->print("%s ", _jvm_args_array[i]);
1073 }
1074 }
1075 }
1076
1077 bool Arguments::process_argument(const char* arg,
1078 jboolean ignore_unrecognized,
1079 JVMFlagOrigin origin) {
1080 JDK_Version since = JDK_Version();
1081
1082 if (parse_argument(arg, origin)) {
1083 return true;
1084 }
1085
1086 // Determine if the flag has '+', '-', or '=' characters.
1087 bool has_plus_minus = (*arg == '+' || *arg == '-');
1088 const char* const argname = has_plus_minus ? arg + 1 : arg;
1089
1090 size_t arg_len;
1091 const char* equal_sign = strchr(argname, '=');
1092 if (equal_sign == nullptr) {
1093 arg_len = strlen(argname);
1094 } else {
1095 arg_len = equal_sign - argname;
1096 }
1097
1098 // Only make the obsolete check for valid arguments.
1099 if (arg_len <= BUFLEN) {
1100 // Construct a string which consists only of the argument name without '+', '-', or '='.
1101 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1102 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1103 if (is_obsolete_flag(stripped_argname, &since)) {
1104 char version[256];
1105 since.to_string(version, sizeof(version));
1106 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1107 return true;
1108 }
1109 }
1110
1111 // For locked flags, report a custom error message if available.
1112 // Otherwise, report the standard unrecognized VM option.
1113 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1114 if (found_flag != nullptr) {
1115 char locked_message_buf[BUFLEN];
1116 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1117 if (strlen(locked_message_buf) != 0) {
1118 #ifdef PRODUCT
1119 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1120 if (ignore_unrecognized && mismatched) {
1121 return true;
1122 }
1123 #endif
1124 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1125 }
1126 if (found_flag->is_bool() && !has_plus_minus) {
1127 jio_fprintf(defaultStream::error_stream(),
1128 "Missing +/- setting for VM option '%s'\n", argname);
1129 } else if (!found_flag->is_bool() && has_plus_minus) {
1130 jio_fprintf(defaultStream::error_stream(),
1131 "Unexpected +/- setting in VM option '%s'\n", argname);
1132 } else {
1133 jio_fprintf(defaultStream::error_stream(),
1134 "Improperly specified VM option '%s'\n", argname);
1135 }
1136 } else {
1137 if (ignore_unrecognized) {
1138 return true;
1139 }
1140 jio_fprintf(defaultStream::error_stream(),
1141 "Unrecognized VM option '%s'\n", argname);
1142 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1143 if (fuzzy_matched != nullptr) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Did you mean '%s%s%s'?\n",
1146 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1147 fuzzy_matched->name(),
1148 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1149 }
1150 }
1151
1152 // allow for commandline "commenting out" options like -XX:#+Verbose
1153 return arg[0] == '#';
1154 }
1155
1156 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1157 FILE* stream = os::fopen(file_name, "rb");
1158 if (stream == nullptr) {
1159 if (should_exist) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Could not open settings file %s\n", file_name);
1162 return false;
1163 } else {
1164 return true;
1165 }
1166 }
1167
1168 char token[1024];
1169 int pos = 0;
1170
1171 bool in_white_space = true;
1172 bool in_comment = false;
1173 bool in_quote = false;
1174 int quote_c = 0;
1175 bool result = true;
1176
1177 int c = getc(stream);
1178 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1179 if (in_white_space) {
1180 if (in_comment) {
1181 if (c == '\n') in_comment = false;
1182 } else {
1183 if (c == '#') in_comment = true;
1184 else if (!isspace((unsigned char) c)) {
1185 in_white_space = false;
1186 token[pos++] = checked_cast<char>(c);
1187 }
1188 }
1189 } else {
1190 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1191 // token ends at newline, or at unquoted whitespace
1192 // this allows a way to include spaces in string-valued options
1193 token[pos] = '\0';
1194 logOption(token);
1195 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1196 build_jvm_flags(token);
1197 pos = 0;
1198 in_white_space = true;
1199 in_quote = false;
1200 } else if (!in_quote && (c == '\'' || c == '"')) {
1201 in_quote = true;
1202 quote_c = c;
1203 } else if (in_quote && (c == quote_c)) {
1204 in_quote = false;
1205 } else {
1206 token[pos++] = checked_cast<char>(c);
1207 }
1208 }
1209 c = getc(stream);
1210 }
1211 if (pos > 0) {
1212 token[pos] = '\0';
1213 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1214 build_jvm_flags(token);
1215 }
1216 fclose(stream);
1217 return result;
1218 }
1219
1220 //=============================================================================================================
1221 // Parsing of properties (-D)
1222
1223 const char* Arguments::get_property(const char* key) {
1224 return PropertyList_get_value(system_properties(), key);
1225 }
1226
1227 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1228 const char* eq = strchr(prop, '=');
1229 const char* key;
1230 const char* value = "";
1231
1232 if (eq == nullptr) {
1233 // property doesn't have a value, thus use passed string
1234 key = prop;
1235 } else {
1236 // property have a value, thus extract it and save to the
1237 // allocated string
1238 size_t key_len = eq - prop;
1239 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1240
1241 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1242 key = tmp_key;
1243
1244 value = &prop[key_len + 1];
1245 }
1246
1247 if (internal == ExternalProperty) {
1248 CDSConfig::check_incompatible_property(key, value);
1249 }
1250
1251 if (strcmp(key, "java.compiler") == 0) {
1252 // we no longer support java.compiler system property, log a warning and let it get
1253 // passed to Java, like any other system property
1254 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1255 // for applications using NONE or empty value, log a more informative message
1256 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1257 } else {
1258 warning("The java.compiler system property is obsolete and no longer supported.");
1259 }
1260 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1261 // sun.java.launcher.is_altjvm property is
1262 // private and is processed in process_sun_java_launcher_properties();
1263 // the sun.java.launcher property is passed on to the java application
1264 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1265 // append is true, writable is true, internal is false
1266 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1267 WriteableProperty, ExternalProperty);
1268 } else {
1269 if (strcmp(key, "sun.java.command") == 0) {
1270 char *old_java_command = _java_command;
1271 _java_command = os::strdup_check_oom(value, mtArguments);
1272 if (old_java_command != nullptr) {
1273 os::free(old_java_command);
1274 }
1275 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1276 // If this property is set on the command line then its value will be
1277 // displayed in VM error logs as the URL at which to submit such logs.
1278 // Normally the URL displayed in error logs is different from the value
1279 // of this system property, so a different property should have been
1280 // used here, but we leave this as-is in case someone depends upon it.
1281 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1282 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1283 // its value without going through the property list or making a Java call.
1284 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1285 if (old_java_vendor_url_bug != nullptr) {
1286 os::free((void *)old_java_vendor_url_bug);
1287 }
1288 }
1289
1290 // Create new property and add at the end of the list
1291 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1292 }
1293
1294 if (key != prop) {
1295 // SystemProperty copy passed value, thus free previously allocated
1296 // memory
1297 FreeHeap((void *)key);
1298 }
1299
1300 return true;
1301 }
1302
1303 //===========================================================================================================
1304 // Setting int/mixed/comp mode flags
1305
1306 void Arguments::set_mode_flags(Mode mode) {
1307 // Set up default values for all flags.
1308 // If you add a flag to any of the branches below,
1309 // add a default value for it here.
1310 _mode = mode;
1311
1312 // Ensure Agent_OnLoad has the correct initial values.
1313 // This may not be the final mode; mode may change later in onload phase.
1314 PropertyList_unique_add(&_system_properties, "java.vm.info",
1315 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1316
1317 UseInterpreter = true;
1318 UseCompiler = true;
1319 UseLoopCounter = true;
1320
1321 // Default values may be platform/compiler dependent -
1322 // use the saved values
1323 ClipInlining = Arguments::_ClipInlining;
1324 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1325 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1326 BackgroundCompilation = Arguments::_BackgroundCompilation;
1327
1328 // Change from defaults based on mode
1329 switch (mode) {
1330 default:
1331 ShouldNotReachHere();
1332 break;
1333 case _int:
1334 UseCompiler = false;
1335 UseLoopCounter = false;
1336 AlwaysCompileLoopMethods = false;
1337 UseOnStackReplacement = false;
1338 break;
1339 case _mixed:
1340 // same as default
1341 break;
1342 case _comp:
1343 UseInterpreter = false;
1344 BackgroundCompilation = false;
1345 ClipInlining = false;
1346 break;
1347 }
1348 }
1349
1350 // Conflict: required to use shared spaces (-Xshare:on), but
1351 // incompatible command line options were chosen.
1352 void Arguments::no_shared_spaces(const char* message) {
1353 if (RequireSharedSpaces) {
1354 jio_fprintf(defaultStream::error_stream(),
1355 "Class data sharing is inconsistent with other specified options.\n");
1356 vm_exit_during_initialization("Unable to use shared archive", message);
1357 } else {
1358 log_info(cds)("Unable to use shared archive: %s", message);
1359 UseSharedSpaces = false;
1360 }
1361 }
1362
1363 static void set_object_alignment() {
1364 // Object alignment.
1365 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1366 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1367 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1368 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1369 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1370 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1371
1372 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1373 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1374
1375 // Oop encoding heap max
1376 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1377 }
1378
1379 size_t Arguments::max_heap_for_compressed_oops() {
1380 // Avoid sign flip.
1381 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1382 // We need to fit both the null page and the heap into the memory budget, while
1383 // keeping alignment constraints of the heap. To guarantee the latter, as the
1384 // null page is located before the heap, we pad the null page to the conservative
1385 // maximum alignment that the GC may ever impose upon the heap.
1386 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1387 _conservative_max_heap_alignment);
1388
1389 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1390 NOT_LP64(ShouldNotReachHere(); return 0);
1391 }
1392
1393 void Arguments::set_use_compressed_oops() {
1394 #ifdef _LP64
1395 // MaxHeapSize is not set up properly at this point, but
1396 // the only value that can override MaxHeapSize if we are
1397 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1398 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1399
1400 if (max_heap_size <= max_heap_for_compressed_oops()) {
1401 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1402 FLAG_SET_ERGO(UseCompressedOops, true);
1403 }
1404 } else {
1405 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1406 warning("Max heap size too large for Compressed Oops");
1407 FLAG_SET_DEFAULT(UseCompressedOops, false);
1408 }
1409 }
1410 #endif // _LP64
1411 }
1412
1413 void Arguments::set_conservative_max_heap_alignment() {
1414 // The conservative maximum required alignment for the heap is the maximum of
1415 // the alignments imposed by several sources: any requirements from the heap
1416 // itself and the maximum page size we may run the VM with.
1417 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1418 _conservative_max_heap_alignment = MAX4(heap_alignment,
1419 os::vm_allocation_granularity(),
1420 os::max_page_size(),
1421 GCArguments::compute_heap_alignment());
1422 }
1423
1424 jint Arguments::set_ergonomics_flags() {
1425 GCConfig::initialize();
1426
1427 set_conservative_max_heap_alignment();
1428
1429 #ifdef _LP64
1430 set_use_compressed_oops();
1431
1432 // Also checks that certain machines are slower with compressed oops
1433 // in vm_version initialization code.
1434 #endif // _LP64
1435
1436 return JNI_OK;
1437 }
1438
1439 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1440 size_t max_allocatable;
1441 size_t result = limit;
1442 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1443 // The AggressiveHeap check is a temporary workaround to avoid calling
1444 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1445 // selected. This works because AggressiveHeap implies UseParallelGC
1446 // where we know the ratio will be 1. Once the AggressiveHeap option is
1447 // removed, this can be cleaned up.
1448 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1449 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1450 result = MIN2(result, max_allocatable / fraction);
1451 }
1452 return result;
1453 }
1454
1455 // Use static initialization to get the default before parsing
1456 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1457
1458 void Arguments::set_heap_size() {
1459 julong phys_mem;
1460
1461 // If the user specified one of these options, they
1462 // want specific memory sizing so do not limit memory
1463 // based on compressed oops addressability.
1464 // Also, memory limits will be calculated based on
1465 // available os physical memory, not our MaxRAM limit,
1466 // unless MaxRAM is also specified.
1467 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1468 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1469 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1470 !FLAG_IS_DEFAULT(MaxRAM));
1471 if (override_coop_limit) {
1472 if (FLAG_IS_DEFAULT(MaxRAM)) {
1473 phys_mem = os::physical_memory();
1474 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1475 } else {
1476 phys_mem = (julong)MaxRAM;
1477 }
1478 } else {
1479 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1480 : (julong)MaxRAM;
1481 }
1482
1483 // If the maximum heap size has not been set with -Xmx,
1484 // then set it as fraction of the size of physical memory,
1485 // respecting the maximum and minimum sizes of the heap.
1486 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1487 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1488 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1489 if (reasonable_min < MaxHeapSize) {
1490 // Small physical memory, so use a minimum fraction of it for the heap
1491 reasonable_max = reasonable_min;
1492 } else {
1493 // Not-small physical memory, so require a heap at least
1494 // as large as MaxHeapSize
1495 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1496 }
1497
1498 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1499 // Limit the heap size to ErgoHeapSizeLimit
1500 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1501 }
1502
1503 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1504
1505 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1506 // An initial heap size was specified on the command line,
1507 // so be sure that the maximum size is consistent. Done
1508 // after call to limit_heap_by_allocatable_memory because that
1509 // method might reduce the allocation size.
1510 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1511 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1512 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1513 }
1514
1515 #ifdef _LP64
1516 if (UseCompressedOops || UseCompressedClassPointers) {
1517 // HeapBaseMinAddress can be greater than default but not less than.
1518 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1519 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1520 // matches compressed oops printing flags
1521 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1522 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1523 DefaultHeapBaseMinAddress,
1524 DefaultHeapBaseMinAddress/G,
1525 HeapBaseMinAddress);
1526 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1527 }
1528 }
1529 }
1530 if (UseCompressedOops) {
1531 // Limit the heap size to the maximum possible when using compressed oops
1532 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1533
1534 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1535 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1536 // but it should be not less than default MaxHeapSize.
1537 max_coop_heap -= HeapBaseMinAddress;
1538 }
1539
1540 // If user specified flags prioritizing os physical
1541 // memory limits, then disable compressed oops if
1542 // limits exceed max_coop_heap and UseCompressedOops
1543 // was not specified.
1544 if (reasonable_max > max_coop_heap) {
1545 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1546 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1547 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1548 "Please check the setting of MaxRAMPercentage %5.2f."
1549 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1550 FLAG_SET_ERGO(UseCompressedOops, false);
1551 } else {
1552 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1553 }
1554 }
1555 }
1556 #endif // _LP64
1557
1558 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1559 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1560 }
1561
1562 // If the minimum or initial heap_size have not been set or requested to be set
1563 // ergonomically, set them accordingly.
1564 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1565 julong reasonable_minimum = (julong)(OldSize + NewSize);
1566
1567 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1568
1569 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1570
1571 if (InitialHeapSize == 0) {
1572 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1573 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1574
1575 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1576 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1577
1578 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1579 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1580 }
1581 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1582 // synchronize with InitialHeapSize to avoid errors with the default value.
1583 if (MinHeapSize == 0) {
1584 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1585 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1586 }
1587 }
1588 }
1589
1590 // This option inspects the machine and attempts to set various
1591 // parameters to be optimal for long-running, memory allocation
1592 // intensive jobs. It is intended for machines with large
1593 // amounts of cpu and memory.
1594 jint Arguments::set_aggressive_heap_flags() {
1595 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1596 // VM, but we may not be able to represent the total physical memory
1597 // available (like having 8gb of memory on a box but using a 32bit VM).
1598 // Thus, we need to make sure we're using a julong for intermediate
1599 // calculations.
1600 julong initHeapSize;
1601 julong total_memory = os::physical_memory();
1602
1603 if (total_memory < (julong) 256 * M) {
1604 jio_fprintf(defaultStream::error_stream(),
1605 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1606 vm_exit(1);
1607 }
1608
1609 // The heap size is half of available memory, or (at most)
1610 // all of possible memory less 160mb (leaving room for the OS
1611 // when using ISM). This is the maximum; because adaptive sizing
1612 // is turned on below, the actual space used may be smaller.
1613
1614 initHeapSize = MIN2(total_memory / (julong) 2,
1615 total_memory - (julong) 160 * M);
1616
1617 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1618
1619 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1620 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1621 return JNI_EINVAL;
1622 }
1623 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1624 return JNI_EINVAL;
1625 }
1626 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1627 return JNI_EINVAL;
1628 }
1629 }
1630 if (FLAG_IS_DEFAULT(NewSize)) {
1631 // Make the young generation 3/8ths of the total heap.
1632 if (FLAG_SET_CMDLINE(NewSize,
1633 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1634 return JNI_EINVAL;
1635 }
1636 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1637 return JNI_EINVAL;
1638 }
1639 }
1640
1641 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1642 FLAG_SET_DEFAULT(UseLargePages, true);
1643 #endif
1644
1645 // Increase some data structure sizes for efficiency
1646 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1647 return JNI_EINVAL;
1648 }
1649 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1650 return JNI_EINVAL;
1651 }
1652 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1653 return JNI_EINVAL;
1654 }
1655
1656 // See the OldPLABSize comment below, but replace 'after promotion'
1657 // with 'after copying'. YoungPLABSize is the size of the survivor
1658 // space per-gc-thread buffers. The default is 4kw.
1659 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1660 return JNI_EINVAL;
1661 }
1662
1663 // OldPLABSize is the size of the buffers in the old gen that
1664 // UseParallelGC uses to promote live data that doesn't fit in the
1665 // survivor spaces. At any given time, there's one for each gc thread.
1666 // The default size is 1kw. These buffers are rarely used, since the
1667 // survivor spaces are usually big enough. For specjbb, however, there
1668 // are occasions when there's lots of live data in the young gen
1669 // and we end up promoting some of it. We don't have a definite
1670 // explanation for why bumping OldPLABSize helps, but the theory
1671 // is that a bigger PLAB results in retaining something like the
1672 // original allocation order after promotion, which improves mutator
1673 // locality. A minor effect may be that larger PLABs reduce the
1674 // number of PLAB allocation events during gc. The value of 8kw
1675 // was arrived at by experimenting with specjbb.
1676 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1677 return JNI_EINVAL;
1678 }
1679
1680 // Enable parallel GC and adaptive generation sizing
1681 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1682 return JNI_EINVAL;
1683 }
1684
1685 // Encourage steady state memory management
1686 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1687 return JNI_EINVAL;
1688 }
1689
1690 return JNI_OK;
1691 }
1692
1693 // This must be called after ergonomics.
1694 void Arguments::set_bytecode_flags() {
1695 if (!RewriteBytecodes) {
1696 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1697 }
1698 }
1699
1700 // Aggressive optimization flags
1701 jint Arguments::set_aggressive_opts_flags() {
1702 #ifdef COMPILER2
1703 if (AggressiveUnboxing) {
1704 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1705 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1706 } else if (!EliminateAutoBox) {
1707 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1708 AggressiveUnboxing = false;
1709 }
1710 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1711 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1712 } else if (!DoEscapeAnalysis) {
1713 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1714 AggressiveUnboxing = false;
1715 }
1716 }
1717 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1718 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1719 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1720 }
1721 // Feed the cache size setting into the JDK
1722 char buffer[1024];
1723 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1724 if (!add_property(buffer)) {
1725 return JNI_ENOMEM;
1726 }
1727 }
1728 #endif
1729
1730 return JNI_OK;
1731 }
1732
1733 //===========================================================================================================
1734
1735 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1736 if (_sun_java_launcher != _default_java_launcher) {
1737 os::free(const_cast<char*>(_sun_java_launcher));
1738 }
1739 _sun_java_launcher = os::strdup_check_oom(launcher);
1740 }
1741
1742 bool Arguments::created_by_java_launcher() {
1743 assert(_sun_java_launcher != nullptr, "property must have value");
1744 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1745 }
1746
1747 bool Arguments::sun_java_launcher_is_altjvm() {
1748 return _sun_java_launcher_is_altjvm;
1749 }
1750
1751 //===========================================================================================================
1752 // Parsing of main arguments
1753
1754 unsigned int addreads_count = 0;
1755 unsigned int addexports_count = 0;
1756 unsigned int addopens_count = 0;
1757 unsigned int addmods_count = 0;
1758 unsigned int patch_mod_count = 0;
1759 unsigned int enable_native_access_count = 0;
1760
1761 // Check the consistency of vm_init_args
1762 bool Arguments::check_vm_args_consistency() {
1763 // Method for adding checks for flag consistency.
1764 // The intent is to warn the user of all possible conflicts,
1765 // before returning an error.
1766 // Note: Needs platform-dependent factoring.
1767 bool status = true;
1768
1769 if (TLABRefillWasteFraction == 0) {
1770 jio_fprintf(defaultStream::error_stream(),
1771 "TLABRefillWasteFraction should be a denominator, "
1772 "not " SIZE_FORMAT "\n",
1773 TLABRefillWasteFraction);
1774 status = false;
1775 }
1776
1777 status = CompilerConfig::check_args_consistency(status);
1778 #if INCLUDE_JVMCI
1779 if (status && EnableJVMCI) {
1780 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1781 AddProperty, UnwriteableProperty, InternalProperty);
1782 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1783 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1784 return false;
1785 }
1786 }
1787 }
1788 #endif
1789
1790 #if INCLUDE_JFR
1791 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1792 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1793 return false;
1794 }
1795 }
1796 #endif
1797
1798 #ifndef SUPPORT_RESERVED_STACK_AREA
1799 if (StackReservedPages != 0) {
1800 FLAG_SET_CMDLINE(StackReservedPages, 0);
1801 warning("Reserved Stack Area not supported on this platform");
1802 }
1803 #endif
1804
1805 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1806 if (LockingMode == LM_LIGHTWEIGHT) {
1807 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1808 warning("New lightweight locking not supported on this platform");
1809 }
1810 #endif
1811
1812 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1813 if (LockingMode == LM_MONITOR) {
1814 jio_fprintf(defaultStream::error_stream(),
1815 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1816 return false;
1817 }
1818 #endif
1819 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1820 jio_fprintf(defaultStream::error_stream(),
1821 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1822 return false;
1823 }
1824 return status;
1825 }
1826
1827 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1828 const char* option_type) {
1829 if (ignore) return false;
1830
1831 const char* spacer = " ";
1832 if (option_type == nullptr) {
1833 option_type = ++spacer; // Set both to the empty string.
1834 }
1835
1836 jio_fprintf(defaultStream::error_stream(),
1837 "Unrecognized %s%soption: %s\n", option_type, spacer,
1838 option->optionString);
1839 return true;
1840 }
1841
1842 static const char* user_assertion_options[] = {
1843 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1844 };
1845
1846 static const char* system_assertion_options[] = {
1847 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1848 };
1849
1850 bool Arguments::parse_uint(const char* value,
1851 uint* uint_arg,
1852 uint min_size) {
1853 uint n;
1854 if (!parse_integer(value, &n)) {
1855 return false;
1856 }
1857 if (n >= min_size) {
1858 *uint_arg = n;
1859 return true;
1860 } else {
1861 return false;
1862 }
1863 }
1864
1865 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1866 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1867 CDSConfig::check_internal_module_property(prop_name, prop_value);
1868 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1869 char* property = AllocateHeap(prop_len, mtArguments);
1870 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1871 if (ret < 0 || ret >= (int)prop_len) {
1872 FreeHeap(property);
1873 return false;
1874 }
1875 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1876 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1877 // that multiple occurrences of the associated flag just causes the existing property value to be
1878 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1879 // to a property after we have finished flag processing.
1880 bool added = add_property(property, WriteableProperty, internal);
1881 FreeHeap(property);
1882 return added;
1883 }
1884
1885 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1886 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1887 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1888 const unsigned int props_count_limit = 1000;
1889 const int max_digits = 3;
1890 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1891
1892 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1893 if (count < props_count_limit) {
1894 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1895 char* property = AllocateHeap(prop_len, mtArguments);
1896 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1897 if (ret < 0 || ret >= (int)prop_len) {
1898 FreeHeap(property);
1899 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1900 return false;
1901 }
1902 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1903 FreeHeap(property);
1904 return added;
1905 }
1906
1907 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1908 return false;
1909 }
1910
1911 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1912 julong* long_arg,
1913 julong min_size,
1914 julong max_size) {
1915 if (!parse_integer(s, long_arg)) return arg_unreadable;
1916 return check_memory_size(*long_arg, min_size, max_size);
1917 }
1918
1919 // Parse JavaVMInitArgs structure
1920
1921 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1922 const JavaVMInitArgs *java_tool_options_args,
1923 const JavaVMInitArgs *java_options_args,
1924 const JavaVMInitArgs *cmd_line_args) {
1925 bool patch_mod_javabase = false;
1926
1927 // Save default settings for some mode flags
1928 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1929 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1930 Arguments::_ClipInlining = ClipInlining;
1931 Arguments::_BackgroundCompilation = BackgroundCompilation;
1932
1933 // Remember the default value of SharedBaseAddress.
1934 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1935
1936 // Setup flags for mixed which is the default
1937 set_mode_flags(_mixed);
1938
1939 // Parse args structure generated from java.base vm options resource
1940 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1941 if (result != JNI_OK) {
1942 return result;
1943 }
1944
1945 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1946 // variable (if present).
1947 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1948 if (result != JNI_OK) {
1949 return result;
1950 }
1951
1952 // Parse args structure generated from the command line flags.
1953 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1954 if (result != JNI_OK) {
1955 return result;
1956 }
1957
1958 // Parse args structure generated from the _JAVA_OPTIONS environment
1959 // variable (if present) (mimics classic VM)
1960 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1961 if (result != JNI_OK) {
1962 return result;
1963 }
1964
1965 // Disable CDS for exploded image
1966 if (!has_jimage()) {
1967 no_shared_spaces("CDS disabled on exploded JDK");
1968 }
1969
1970 // We need to ensure processor and memory resources have been properly
1971 // configured - which may rely on arguments we just processed - before
1972 // doing the final argument processing. Any argument processing that
1973 // needs to know about processor and memory resources must occur after
1974 // this point.
1975
1976 os::init_container_support();
1977
1978 SystemMemoryBarrier::initialize();
1979
1980 // Do final processing now that all arguments have been parsed
1981 result = finalize_vm_init_args(patch_mod_javabase);
1982 if (result != JNI_OK) {
1983 return result;
1984 }
1985
1986 return JNI_OK;
1987 }
1988
1989 #if !INCLUDE_JVMTI
1990 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1991 // represents a valid JDWP agent. is_path==true denotes that we
1992 // are dealing with -agentpath (case where name is a path), otherwise with
1993 // -agentlib
1994 static bool valid_jdwp_agent(char *name, bool is_path) {
1995 char *_name;
1996 const char *_jdwp = "jdwp";
1997 size_t _len_jdwp, _len_prefix;
1998
1999 if (is_path) {
2000 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2001 return false;
2002 }
2003
2004 _name++; // skip past last path separator
2005 _len_prefix = strlen(JNI_LIB_PREFIX);
2006
2007 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2008 return false;
2009 }
2010
2011 _name += _len_prefix;
2012 _len_jdwp = strlen(_jdwp);
2013
2014 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2015 _name += _len_jdwp;
2016 }
2017 else {
2018 return false;
2019 }
2020
2021 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2022 return false;
2023 }
2024
2025 return true;
2026 }
2027
2028 if (strcmp(name, _jdwp) == 0) {
2029 return true;
2030 }
2031
2032 return false;
2033 }
2034 #endif
2035
2036 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2037 // --patch-module=<module>=<file>(<pathsep><file>)*
2038 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2039 // Find the equal sign between the module name and the path specification
2040 const char* module_equal = strchr(patch_mod_tail, '=');
2041 if (module_equal == nullptr) {
2042 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2043 return JNI_ERR;
2044 } else {
2045 // Pick out the module name
2046 size_t module_len = module_equal - patch_mod_tail;
2047 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2048 if (module_name != nullptr) {
2049 memcpy(module_name, patch_mod_tail, module_len);
2050 *(module_name + module_len) = '\0';
2051 // The path piece begins one past the module_equal sign
2052 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2053 FREE_C_HEAP_ARRAY(char, module_name);
2054 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2055 return JNI_ENOMEM;
2056 }
2057 } else {
2058 return JNI_ENOMEM;
2059 }
2060 }
2061 return JNI_OK;
2062 }
2063
2064 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2065 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2066 // The min and max sizes match the values in globals.hpp, but scaled
2067 // with K. The values have been chosen so that alignment with page
2068 // size doesn't change the max value, which makes the conversions
2069 // back and forth between Xss value and ThreadStackSize value easier.
2070 // The values have also been chosen to fit inside a 32-bit signed type.
2071 const julong min_ThreadStackSize = 0;
2072 const julong max_ThreadStackSize = 1 * M;
2073
2074 // Make sure the above values match the range set in globals.hpp
2075 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2076 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2077 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2078
2079 const julong min_size = min_ThreadStackSize * K;
2080 const julong max_size = max_ThreadStackSize * K;
2081
2082 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2083
2084 julong size = 0;
2085 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2086 if (errcode != arg_in_range) {
2087 bool silent = (option == nullptr); // Allow testing to silence error messages
2088 if (!silent) {
2089 jio_fprintf(defaultStream::error_stream(),
2090 "Invalid thread stack size: %s\n", option->optionString);
2091 describe_range_error(errcode);
2092 }
2093 return JNI_EINVAL;
2094 }
2095
2096 // Internally track ThreadStackSize in units of 1024 bytes.
2097 const julong size_aligned = align_up(size, K);
2098 assert(size <= size_aligned,
2099 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2100 size, size_aligned);
2101
2102 const julong size_in_K = size_aligned / K;
2103 assert(size_in_K < (julong)max_intx,
2104 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2105 size_in_K);
2106
2107 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2108 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2109 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2110 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2111 max_expanded, size_in_K);
2112
2113 *out_ThreadStackSize = (intx)size_in_K;
2114
2115 return JNI_OK;
2116 }
2117
2118 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2119 // For match_option to return remaining or value part of option string
2120 const char* tail;
2121
2122 // iterate over arguments
2123 for (int index = 0; index < args->nOptions; index++) {
2124 bool is_absolute_path = false; // for -agentpath vs -agentlib
2125
2126 const JavaVMOption* option = args->options + index;
2127
2128 if (!match_option(option, "-Djava.class.path", &tail) &&
2129 !match_option(option, "-Dsun.java.command", &tail) &&
2130 !match_option(option, "-Dsun.java.launcher", &tail)) {
2131
2132 // add all jvm options to the jvm_args string. This string
2133 // is used later to set the java.vm.args PerfData string constant.
2134 // the -Djava.class.path and the -Dsun.java.command options are
2135 // omitted from jvm_args string as each have their own PerfData
2136 // string constant object.
2137 build_jvm_args(option->optionString);
2138 }
2139
2140 // -verbose:[class/module/gc/jni]
2141 if (match_option(option, "-verbose", &tail)) {
2142 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2143 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2144 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2145 } else if (!strcmp(tail, ":module")) {
2146 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2147 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2148 } else if (!strcmp(tail, ":gc")) {
2149 if (_legacyGCLogging.lastFlag == 0) {
2150 _legacyGCLogging.lastFlag = 1;
2151 }
2152 } else if (!strcmp(tail, ":jni")) {
2153 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2154 }
2155 // -da / -ea / -disableassertions / -enableassertions
2156 // These accept an optional class/package name separated by a colon, e.g.,
2157 // -da:java.lang.Thread.
2158 } else if (match_option(option, user_assertion_options, &tail, true)) {
2159 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2160 if (*tail == '\0') {
2161 JavaAssertions::setUserClassDefault(enable);
2162 } else {
2163 assert(*tail == ':', "bogus match by match_option()");
2164 JavaAssertions::addOption(tail + 1, enable);
2165 }
2166 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2167 } else if (match_option(option, system_assertion_options, &tail, false)) {
2168 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2169 JavaAssertions::setSystemClassDefault(enable);
2170 // -bootclasspath:
2171 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2172 jio_fprintf(defaultStream::output_stream(),
2173 "-Xbootclasspath is no longer a supported option.\n");
2174 return JNI_EINVAL;
2175 // -bootclasspath/a:
2176 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2177 Arguments::append_sysclasspath(tail);
2178 // -bootclasspath/p:
2179 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2180 jio_fprintf(defaultStream::output_stream(),
2181 "-Xbootclasspath/p is no longer a supported option.\n");
2182 return JNI_EINVAL;
2183 // -Xrun
2184 } else if (match_option(option, "-Xrun", &tail)) {
2185 if (tail != nullptr) {
2186 const char* pos = strchr(tail, ':');
2187 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2188 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2189 jio_snprintf(name, len + 1, "%s", tail);
2190
2191 char *options = nullptr;
2192 if(pos != nullptr) {
2193 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2194 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2195 }
2196 #if !INCLUDE_JVMTI
2197 if (strcmp(name, "jdwp") == 0) {
2198 jio_fprintf(defaultStream::error_stream(),
2199 "Debugging agents are not supported in this VM\n");
2200 return JNI_ERR;
2201 }
2202 #endif // !INCLUDE_JVMTI
2203 JvmtiAgentList::add_xrun(name, options, false);
2204 FREE_C_HEAP_ARRAY(char, name);
2205 FREE_C_HEAP_ARRAY(char, options);
2206 }
2207 } else if (match_option(option, "--add-reads=", &tail)) {
2208 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2209 return JNI_ENOMEM;
2210 }
2211 } else if (match_option(option, "--add-exports=", &tail)) {
2212 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2213 return JNI_ENOMEM;
2214 }
2215 } else if (match_option(option, "--add-opens=", &tail)) {
2216 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2217 return JNI_ENOMEM;
2218 }
2219 } else if (match_option(option, "--add-modules=", &tail)) {
2220 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2221 return JNI_ENOMEM;
2222 }
2223 } else if (match_option(option, "--enable-native-access=", &tail)) {
2224 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2225 return JNI_ENOMEM;
2226 }
2227 } else if (match_option(option, "--limit-modules=", &tail)) {
2228 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2229 return JNI_ENOMEM;
2230 }
2231 } else if (match_option(option, "--module-path=", &tail)) {
2232 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2233 return JNI_ENOMEM;
2234 }
2235 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2236 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2237 return JNI_ENOMEM;
2238 }
2239 } else if (match_option(option, "--patch-module=", &tail)) {
2240 // --patch-module=<module>=<file>(<pathsep><file>)*
2241 int res = process_patch_mod_option(tail, patch_mod_javabase);
2242 if (res != JNI_OK) {
2243 return res;
2244 }
2245 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2246 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2247 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2248 AddProperty, WriteableProperty, InternalProperty);
2249 } else {
2250 jio_fprintf(defaultStream::error_stream(),
2251 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2252 return JNI_ERR;
2253 }
2254 } else if (match_option(option, "--illegal-access=", &tail)) {
2255 char version[256];
2256 JDK_Version::jdk(17).to_string(version, sizeof(version));
2257 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2258 // -agentlib and -agentpath
2259 } else if (match_option(option, "-agentlib:", &tail) ||
2260 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2261 if(tail != nullptr) {
2262 const char* pos = strchr(tail, '=');
2263 char* name;
2264 if (pos == nullptr) {
2265 name = os::strdup_check_oom(tail, mtArguments);
2266 } else {
2267 size_t len = pos - tail;
2268 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2269 memcpy(name, tail, len);
2270 name[len] = '\0';
2271 }
2272
2273 char *options = nullptr;
2274 if(pos != nullptr) {
2275 options = os::strdup_check_oom(pos + 1, mtArguments);
2276 }
2277 #if !INCLUDE_JVMTI
2278 if (valid_jdwp_agent(name, is_absolute_path)) {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "Debugging agents are not supported in this VM\n");
2281 return JNI_ERR;
2282 }
2283 #endif // !INCLUDE_JVMTI
2284 JvmtiAgentList::add(name, options, is_absolute_path);
2285 os::free(name);
2286 os::free(options);
2287 }
2288 // -javaagent
2289 } else if (match_option(option, "-javaagent:", &tail)) {
2290 #if !INCLUDE_JVMTI
2291 jio_fprintf(defaultStream::error_stream(),
2292 "Instrumentation agents are not supported in this VM\n");
2293 return JNI_ERR;
2294 #else
2295 if (tail != nullptr) {
2296 size_t length = strlen(tail) + 1;
2297 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2298 jio_snprintf(options, length, "%s", tail);
2299 JvmtiAgentList::add("instrument", options, false);
2300 FREE_C_HEAP_ARRAY(char, options);
2301
2302 // java agents need module java.instrument
2303 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2304 return JNI_ENOMEM;
2305 }
2306 }
2307 #endif // !INCLUDE_JVMTI
2308 // --enable_preview
2309 } else if (match_option(option, "--enable-preview")) {
2310 set_enable_preview();
2311 // -Xnoclassgc
2312 } else if (match_option(option, "-Xnoclassgc")) {
2313 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2314 return JNI_EINVAL;
2315 }
2316 // -Xbatch
2317 } else if (match_option(option, "-Xbatch")) {
2318 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2319 return JNI_EINVAL;
2320 }
2321 // -Xmn for compatibility with other JVM vendors
2322 } else if (match_option(option, "-Xmn", &tail)) {
2323 julong long_initial_young_size = 0;
2324 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2325 if (errcode != arg_in_range) {
2326 jio_fprintf(defaultStream::error_stream(),
2327 "Invalid initial young generation size: %s\n", option->optionString);
2328 describe_range_error(errcode);
2329 return JNI_EINVAL;
2330 }
2331 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2332 return JNI_EINVAL;
2333 }
2334 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2335 return JNI_EINVAL;
2336 }
2337 // -Xms
2338 } else if (match_option(option, "-Xms", &tail)) {
2339 julong size = 0;
2340 // an initial heap size of 0 means automatically determine
2341 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2342 if (errcode != arg_in_range) {
2343 jio_fprintf(defaultStream::error_stream(),
2344 "Invalid initial heap size: %s\n", option->optionString);
2345 describe_range_error(errcode);
2346 return JNI_EINVAL;
2347 }
2348 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2349 return JNI_EINVAL;
2350 }
2351 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2352 return JNI_EINVAL;
2353 }
2354 // -Xmx
2355 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2356 julong long_max_heap_size = 0;
2357 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2358 if (errcode != arg_in_range) {
2359 jio_fprintf(defaultStream::error_stream(),
2360 "Invalid maximum heap size: %s\n", option->optionString);
2361 describe_range_error(errcode);
2362 return JNI_EINVAL;
2363 }
2364 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2365 return JNI_EINVAL;
2366 }
2367 // Xmaxf
2368 } else if (match_option(option, "-Xmaxf", &tail)) {
2369 char* err;
2370 int maxf = (int)(strtod(tail, &err) * 100);
2371 if (*err != '\0' || *tail == '\0') {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Bad max heap free percentage size: %s\n",
2374 option->optionString);
2375 return JNI_EINVAL;
2376 } else {
2377 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 }
2381 // Xminf
2382 } else if (match_option(option, "-Xminf", &tail)) {
2383 char* err;
2384 int minf = (int)(strtod(tail, &err) * 100);
2385 if (*err != '\0' || *tail == '\0') {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "Bad min heap free percentage size: %s\n",
2388 option->optionString);
2389 return JNI_EINVAL;
2390 } else {
2391 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2392 return JNI_EINVAL;
2393 }
2394 }
2395 // -Xss
2396 } else if (match_option(option, "-Xss", &tail)) {
2397 intx value = 0;
2398 jint err = parse_xss(option, tail, &value);
2399 if (err != JNI_OK) {
2400 return err;
2401 }
2402 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2403 return JNI_EINVAL;
2404 }
2405 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2406 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2407 julong long_ReservedCodeCacheSize = 0;
2408
2409 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2410 if (errcode != arg_in_range) {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "Invalid maximum code cache size: %s.\n", option->optionString);
2413 return JNI_EINVAL;
2414 }
2415 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2416 return JNI_EINVAL;
2417 }
2418 // -green
2419 } else if (match_option(option, "-green")) {
2420 jio_fprintf(defaultStream::error_stream(),
2421 "Green threads support not available\n");
2422 return JNI_EINVAL;
2423 // -native
2424 } else if (match_option(option, "-native")) {
2425 // HotSpot always uses native threads, ignore silently for compatibility
2426 // -Xrs
2427 } else if (match_option(option, "-Xrs")) {
2428 // Classic/EVM option, new functionality
2429 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 // -Xprof
2433 } else if (match_option(option, "-Xprof")) {
2434 char version[256];
2435 // Obsolete in JDK 10
2436 JDK_Version::jdk(10).to_string(version, sizeof(version));
2437 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2438 // -Xinternalversion
2439 } else if (match_option(option, "-Xinternalversion")) {
2440 jio_fprintf(defaultStream::output_stream(), "%s\n",
2441 VM_Version::internal_vm_info_string());
2442 vm_exit(0);
2443 #ifndef PRODUCT
2444 // -Xprintflags
2445 } else if (match_option(option, "-Xprintflags")) {
2446 JVMFlag::printFlags(tty, false);
2447 vm_exit(0);
2448 #endif
2449 // -D
2450 } else if (match_option(option, "-D", &tail)) {
2451 const char* value;
2452 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2453 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2454 // abort if -Djava.endorsed.dirs is set
2455 jio_fprintf(defaultStream::output_stream(),
2456 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2457 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2458 return JNI_EINVAL;
2459 }
2460 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2461 *value != '\0' && strcmp(value, "\"\"") != 0) {
2462 // abort if -Djava.ext.dirs is set
2463 jio_fprintf(defaultStream::output_stream(),
2464 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2465 return JNI_EINVAL;
2466 }
2467 // Check for module related properties. They must be set using the modules
2468 // options. For example: use "--add-modules=java.sql", not
2469 // "-Djdk.module.addmods=java.sql"
2470 if (is_internal_module_property(option->optionString + 2)) {
2471 needs_module_property_warning = true;
2472 continue;
2473 }
2474 if (!add_property(tail)) {
2475 return JNI_ENOMEM;
2476 }
2477 // Out of the box management support
2478 if (match_option(option, "-Dcom.sun.management", &tail)) {
2479 #if INCLUDE_MANAGEMENT
2480 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2481 return JNI_EINVAL;
2482 }
2483 // management agent in module jdk.management.agent
2484 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2485 return JNI_ENOMEM;
2486 }
2487 #else
2488 jio_fprintf(defaultStream::output_stream(),
2489 "-Dcom.sun.management is not supported in this VM.\n");
2490 return JNI_ERR;
2491 #endif
2492 }
2493 // -Xint
2494 } else if (match_option(option, "-Xint")) {
2495 set_mode_flags(_int);
2496 mode_flag_cmd_line = true;
2497 // -Xmixed
2498 } else if (match_option(option, "-Xmixed")) {
2499 set_mode_flags(_mixed);
2500 mode_flag_cmd_line = true;
2501 // -Xcomp
2502 } else if (match_option(option, "-Xcomp")) {
2503 // for testing the compiler; turn off all flags that inhibit compilation
2504 set_mode_flags(_comp);
2505 mode_flag_cmd_line = true;
2506 // -Xshare:dump
2507 } else if (match_option(option, "-Xshare:dump")) {
2508 CDSConfig::enable_dumping_static_archive();
2509 // -Xshare:on
2510 } else if (match_option(option, "-Xshare:on")) {
2511 UseSharedSpaces = true;
2512 RequireSharedSpaces = true;
2513 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2514 } else if (match_option(option, "-Xshare:auto")) {
2515 UseSharedSpaces = true;
2516 RequireSharedSpaces = false;
2517 xshare_auto_cmd_line = true;
2518 // -Xshare:off
2519 } else if (match_option(option, "-Xshare:off")) {
2520 UseSharedSpaces = false;
2521 RequireSharedSpaces = false;
2522 // -Xverify
2523 } else if (match_option(option, "-Xverify", &tail)) {
2524 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2525 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2526 return JNI_EINVAL;
2527 }
2528 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2529 return JNI_EINVAL;
2530 }
2531 } else if (strcmp(tail, ":remote") == 0) {
2532 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2533 return JNI_EINVAL;
2534 }
2535 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2536 return JNI_EINVAL;
2537 }
2538 } else if (strcmp(tail, ":none") == 0) {
2539 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2540 return JNI_EINVAL;
2541 }
2542 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2543 return JNI_EINVAL;
2544 }
2545 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2546 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2547 return JNI_EINVAL;
2548 }
2549 // -Xdebug
2550 } else if (match_option(option, "-Xdebug")) {
2551 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2552 } else if (match_option(option, "-Xloggc:", &tail)) {
2553 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2554 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2555 _legacyGCLogging.lastFlag = 2;
2556 _legacyGCLogging.file = os::strdup_check_oom(tail);
2557 } else if (match_option(option, "-Xlog", &tail)) {
2558 bool ret = false;
2559 if (strcmp(tail, ":help") == 0) {
2560 fileStream stream(defaultStream::output_stream());
2561 LogConfiguration::print_command_line_help(&stream);
2562 vm_exit(0);
2563 } else if (strcmp(tail, ":disable") == 0) {
2564 LogConfiguration::disable_logging();
2565 ret = true;
2566 } else if (strcmp(tail, ":async") == 0) {
2567 LogConfiguration::set_async_mode(true);
2568 ret = true;
2569 } else if (*tail == '\0') {
2570 ret = LogConfiguration::parse_command_line_arguments();
2571 assert(ret, "-Xlog without arguments should never fail to parse");
2572 } else if (*tail == ':') {
2573 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2574 }
2575 if (ret == false) {
2576 jio_fprintf(defaultStream::error_stream(),
2577 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2578 tail);
2579 return JNI_EINVAL;
2580 }
2581 // JNI hooks
2582 } else if (match_option(option, "-Xcheck", &tail)) {
2583 if (!strcmp(tail, ":jni")) {
2584 #if !INCLUDE_JNI_CHECK
2585 warning("JNI CHECKING is not supported in this VM");
2586 #else
2587 CheckJNICalls = true;
2588 #endif // INCLUDE_JNI_CHECK
2589 } else if (is_bad_option(option, args->ignoreUnrecognized,
2590 "check")) {
2591 return JNI_EINVAL;
2592 }
2593 } else if (match_option(option, "vfprintf")) {
2594 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2595 } else if (match_option(option, "exit")) {
2596 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2597 } else if (match_option(option, "abort")) {
2598 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2599 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2600 // and the last option wins.
2601 } else if (match_option(option, "-XX:+NeverTenure")) {
2602 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2606 return JNI_EINVAL;
2607 }
2608 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2609 return JNI_EINVAL;
2610 }
2611 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2612 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2616 return JNI_EINVAL;
2617 }
2618 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2619 return JNI_EINVAL;
2620 }
2621 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2622 uint max_tenuring_thresh = 0;
2623 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2626 return JNI_EINVAL;
2627 }
2628
2629 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2630 return JNI_EINVAL;
2631 }
2632
2633 if (MaxTenuringThreshold == 0) {
2634 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2635 return JNI_EINVAL;
2636 }
2637 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2638 return JNI_EINVAL;
2639 }
2640 } else {
2641 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2645 return JNI_EINVAL;
2646 }
2647 }
2648 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2649 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2653 return JNI_EINVAL;
2654 }
2655 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2656 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2657 return JNI_EINVAL;
2658 }
2659 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2660 return JNI_EINVAL;
2661 }
2662 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2663 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2670 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2671 return JNI_EINVAL;
2672 }
2673 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 } else if (match_option(option, "--finalization=", &tail)) {
2677 if (strcmp(tail, "enabled") == 0) {
2678 InstanceKlass::set_finalization_enabled(true);
2679 } else if (strcmp(tail, "disabled") == 0) {
2680 InstanceKlass::set_finalization_enabled(false);
2681 } else {
2682 jio_fprintf(defaultStream::error_stream(),
2683 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2684 tail);
2685 return JNI_EINVAL;
2686 }
2687 #if !defined(DTRACE_ENABLED)
2688 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2689 jio_fprintf(defaultStream::error_stream(),
2690 "DTraceMethodProbes flag is not applicable for this configuration\n");
2691 return JNI_EINVAL;
2692 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2693 jio_fprintf(defaultStream::error_stream(),
2694 "DTraceAllocProbes flag is not applicable for this configuration\n");
2695 return JNI_EINVAL;
2696 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2697 jio_fprintf(defaultStream::error_stream(),
2698 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2699 return JNI_EINVAL;
2700 #endif // !defined(DTRACE_ENABLED)
2701 #ifdef ASSERT
2702 } else if (match_option(option, "-XX:+FullGCALot")) {
2703 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2704 return JNI_EINVAL;
2705 }
2706 #endif
2707 #if !INCLUDE_MANAGEMENT
2708 } else if (match_option(option, "-XX:+ManagementServer")) {
2709 jio_fprintf(defaultStream::error_stream(),
2710 "ManagementServer is not supported in this VM.\n");
2711 return JNI_ERR;
2712 #endif // INCLUDE_MANAGEMENT
2713 #if INCLUDE_JVMCI
2714 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2715 if (EnableJVMCIProduct) {
2716 jio_fprintf(defaultStream::error_stream(),
2717 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2718 return JNI_EINVAL;
2719 }
2720 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2721 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2722 if (use_graal_jit) {
2723 const char* jvmci_compiler = get_property("jvmci.Compiler");
2724 if (jvmci_compiler != nullptr) {
2725 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2728 return JNI_ERR;
2729 }
2730 } else if (!add_property("jvmci.Compiler=graal")) {
2731 return JNI_ENOMEM;
2732 }
2733 }
2734
2735 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2736 if (EnableJVMCIProduct) {
2737 continue;
2738 }
2739 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2740 // Allow this flag if it has been unlocked.
2741 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2742 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Unable to enable JVMCI in product mode\n");
2745 return JNI_ERR;
2746 }
2747 }
2748 // The flag was locked so process normally to report that error
2749 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2750 return JNI_EINVAL;
2751 }
2752 #endif // INCLUDE_JVMCI
2753 #if INCLUDE_JFR
2754 } else if (match_jfr_option(&option)) {
2755 return JNI_EINVAL;
2756 #endif
2757 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2758 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2759 // already been handled
2760 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2761 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2762 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2763 return JNI_EINVAL;
2764 }
2765 }
2766 // Unknown option
2767 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2768 return JNI_ERR;
2769 }
2770 }
2771
2772 // PrintSharedArchiveAndExit will turn on
2773 // -Xshare:on
2774 // -Xlog:class+path=info
2775 if (PrintSharedArchiveAndExit) {
2776 UseSharedSpaces = true;
2777 RequireSharedSpaces = true;
2778 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2779 }
2780
2781 fix_appclasspath();
2782
2783 return JNI_OK;
2784 }
2785
2786 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2787 // For java.base check for duplicate --patch-module options being specified on the command line.
2788 // This check is only required for java.base, all other duplicate module specifications
2789 // will be checked during module system initialization. The module system initialization
2790 // will throw an ExceptionInInitializerError if this situation occurs.
2791 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2792 if (*patch_mod_javabase) {
2793 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2794 } else {
2795 *patch_mod_javabase = true;
2796 }
2797 }
2798
2799 // Create GrowableArray lazily, only if --patch-module has been specified
2800 if (_patch_mod_prefix == nullptr) {
2801 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2802 }
2803
2804 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2805 }
2806
2807 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2808 //
2809 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2810 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2811 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2812 // path is treated as the current directory.
2813 //
2814 // This causes problems with CDS, which requires that all directories specified in the classpath
2815 // must be empty. In most cases, applications do NOT want to load classes from the current
2816 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2817 // scripts compatible with CDS.
2818 void Arguments::fix_appclasspath() {
2819 if (IgnoreEmptyClassPaths) {
2820 const char separator = *os::path_separator();
2821 const char* src = _java_class_path->value();
2822
2823 // skip over all the leading empty paths
2824 while (*src == separator) {
2825 src ++;
2826 }
2827
2828 char* copy = os::strdup_check_oom(src, mtArguments);
2829
2830 // trim all trailing empty paths
2831 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2832 *tail = '\0';
2833 }
2834
2835 char from[3] = {separator, separator, '\0'};
2836 char to [2] = {separator, '\0'};
2837 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2838 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2839 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2840 }
2841
2842 _java_class_path->set_writeable_value(copy);
2843 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2844 }
2845 }
2846
2847 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2848 // check if the default lib/endorsed directory exists; if so, error
2849 char path[JVM_MAXPATHLEN];
2850 const char* fileSep = os::file_separator();
2851 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2852
2853 DIR* dir = os::opendir(path);
2854 if (dir != nullptr) {
2855 jio_fprintf(defaultStream::output_stream(),
2856 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2857 "in modular form will be supported via the concept of upgradeable modules.\n");
2858 os::closedir(dir);
2859 return JNI_ERR;
2860 }
2861
2862 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2863 dir = os::opendir(path);
2864 if (dir != nullptr) {
2865 jio_fprintf(defaultStream::output_stream(),
2866 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2867 "Use -classpath instead.\n.");
2868 os::closedir(dir);
2869 return JNI_ERR;
2870 }
2871
2872 // This must be done after all arguments have been processed
2873 // and the container support has been initialized since AggressiveHeap
2874 // relies on the amount of total memory available.
2875 if (AggressiveHeap) {
2876 jint result = set_aggressive_heap_flags();
2877 if (result != JNI_OK) {
2878 return result;
2879 }
2880 }
2881
2882 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2883 // but like -Xint, leave compilation thresholds unaffected.
2884 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2885 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2886 set_mode_flags(_int);
2887 }
2888
2889 #ifdef ZERO
2890 // Zero always runs in interpreted mode
2891 set_mode_flags(_int);
2892 #endif
2893
2894 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2895 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2896 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2897 }
2898
2899 #if !COMPILER2_OR_JVMCI
2900 // Don't degrade server performance for footprint
2901 if (FLAG_IS_DEFAULT(UseLargePages) &&
2902 MaxHeapSize < LargePageHeapSizeThreshold) {
2903 // No need for large granularity pages w/small heaps.
2904 // Note that large pages are enabled/disabled for both the
2905 // Java heap and the code cache.
2906 FLAG_SET_DEFAULT(UseLargePages, false);
2907 }
2908
2909 UNSUPPORTED_OPTION(ProfileInterpreter);
2910 #endif
2911
2912 // Parse the CompilationMode flag
2913 if (!CompilationModeFlag::initialize()) {
2914 return JNI_ERR;
2915 }
2916
2917 if (!check_vm_args_consistency()) {
2918 return JNI_ERR;
2919 }
2920
2921 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2922 return JNI_ERR;
2923 }
2924
2925 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2926 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2927 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2928
2929 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
2930 // ObjectMonitorTable requires lightweight locking.
2931 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
2932 }
2933
2934 #ifdef _LP64
2935 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
2936 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
2937 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
2938 }
2939 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
2940 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
2941 }
2942 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
2943 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
2944 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
2945 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
2946
2947 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
2948 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
2949 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
2950 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
2951 } else {
2952 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
2953 }
2954 }
2955 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
2956 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
2957 }
2958 #endif
2959
2960 return JNI_OK;
2961 }
2962
2963 // Helper class for controlling the lifetime of JavaVMInitArgs
2964 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2965 // deleted on the destruction of the ScopedVMInitArgs object.
2966 class ScopedVMInitArgs : public StackObj {
2967 private:
2968 JavaVMInitArgs _args;
2969 char* _container_name;
2970 bool _is_set;
2971 char* _vm_options_file_arg;
2972
2973 public:
2974 ScopedVMInitArgs(const char *container_name) {
2975 _args.version = JNI_VERSION_1_2;
2976 _args.nOptions = 0;
2977 _args.options = nullptr;
2978 _args.ignoreUnrecognized = false;
2979 _container_name = (char *)container_name;
2980 _is_set = false;
2981 _vm_options_file_arg = nullptr;
2982 }
2983
2984 // Populates the JavaVMInitArgs object represented by this
2985 // ScopedVMInitArgs object with the arguments in options. The
2986 // allocated memory is deleted by the destructor. If this method
2987 // returns anything other than JNI_OK, then this object is in a
2988 // partially constructed state, and should be abandoned.
2989 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2990 _is_set = true;
2991 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2992 JavaVMOption, options->length(), mtArguments);
2993 if (options_arr == nullptr) {
2994 return JNI_ENOMEM;
2995 }
2996 _args.options = options_arr;
2997
2998 for (int i = 0; i < options->length(); i++) {
2999 options_arr[i] = options->at(i);
3000 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3001 if (options_arr[i].optionString == nullptr) {
3002 // Rely on the destructor to do cleanup.
3003 _args.nOptions = i;
3004 return JNI_ENOMEM;
3005 }
3006 }
3007
3008 _args.nOptions = options->length();
3009 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3010 return JNI_OK;
3011 }
3012
3013 JavaVMInitArgs* get() { return &_args; }
3014 char* container_name() { return _container_name; }
3015 bool is_set() { return _is_set; }
3016 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3017 char* vm_options_file_arg() { return _vm_options_file_arg; }
3018
3019 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3020 if (_vm_options_file_arg != nullptr) {
3021 os::free(_vm_options_file_arg);
3022 }
3023 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3024 }
3025
3026 ~ScopedVMInitArgs() {
3027 if (_vm_options_file_arg != nullptr) {
3028 os::free(_vm_options_file_arg);
3029 }
3030 if (_args.options == nullptr) return;
3031 for (int i = 0; i < _args.nOptions; i++) {
3032 os::free(_args.options[i].optionString);
3033 }
3034 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3035 }
3036
3037 // Insert options into this option list, to replace option at
3038 // vm_options_file_pos (-XX:VMOptionsFile)
3039 jint insert(const JavaVMInitArgs* args,
3040 const JavaVMInitArgs* args_to_insert,
3041 const int vm_options_file_pos) {
3042 assert(_args.options == nullptr, "shouldn't be set yet");
3043 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3044 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3045
3046 int length = args->nOptions + args_to_insert->nOptions - 1;
3047 // Construct new option array
3048 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3049 for (int i = 0; i < args->nOptions; i++) {
3050 if (i == vm_options_file_pos) {
3051 // insert the new options starting at the same place as the
3052 // -XX:VMOptionsFile option
3053 for (int j = 0; j < args_to_insert->nOptions; j++) {
3054 options.push(args_to_insert->options[j]);
3055 }
3056 } else {
3057 options.push(args->options[i]);
3058 }
3059 }
3060 // make into options array
3061 return set_args(&options);
3062 }
3063 };
3064
3065 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3066 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3067 }
3068
3069 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3070 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3071 }
3072
3073 jint Arguments::parse_options_environment_variable(const char* name,
3074 ScopedVMInitArgs* vm_args) {
3075 char *buffer = ::getenv(name);
3076
3077 // Don't check this environment variable if user has special privileges
3078 // (e.g. unix su command).
3079 if (buffer == nullptr || os::have_special_privileges()) {
3080 return JNI_OK;
3081 }
3082
3083 if ((buffer = os::strdup(buffer)) == nullptr) {
3084 return JNI_ENOMEM;
3085 }
3086
3087 jio_fprintf(defaultStream::error_stream(),
3088 "Picked up %s: %s\n", name, buffer);
3089
3090 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3091
3092 os::free(buffer);
3093 return retcode;
3094 }
3095
3096 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3097 // read file into buffer
3098 int fd = ::open(file_name, O_RDONLY);
3099 if (fd < 0) {
3100 jio_fprintf(defaultStream::error_stream(),
3101 "Could not open options file '%s'\n",
3102 file_name);
3103 return JNI_ERR;
3104 }
3105
3106 struct stat stbuf;
3107 int retcode = os::stat(file_name, &stbuf);
3108 if (retcode != 0) {
3109 jio_fprintf(defaultStream::error_stream(),
3110 "Could not stat options file '%s'\n",
3111 file_name);
3112 ::close(fd);
3113 return JNI_ERR;
3114 }
3115
3116 if (stbuf.st_size == 0) {
3117 // tell caller there is no option data and that is ok
3118 ::close(fd);
3119 return JNI_OK;
3120 }
3121
3122 // '+ 1' for null termination even with max bytes
3123 size_t bytes_alloc = stbuf.st_size + 1;
3124
3125 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3126 if (nullptr == buf) {
3127 jio_fprintf(defaultStream::error_stream(),
3128 "Could not allocate read buffer for options file parse\n");
3129 ::close(fd);
3130 return JNI_ENOMEM;
3131 }
3132
3133 memset(buf, 0, bytes_alloc);
3134
3135 // Fill buffer
3136 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3137 ::close(fd);
3138 if (bytes_read < 0) {
3139 FREE_C_HEAP_ARRAY(char, buf);
3140 jio_fprintf(defaultStream::error_stream(),
3141 "Could not read options file '%s'\n", file_name);
3142 return JNI_ERR;
3143 }
3144
3145 if (bytes_read == 0) {
3146 // tell caller there is no option data and that is ok
3147 FREE_C_HEAP_ARRAY(char, buf);
3148 return JNI_OK;
3149 }
3150
3151 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3152
3153 FREE_C_HEAP_ARRAY(char, buf);
3154 return retcode;
3155 }
3156
3157 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3158 // Construct option array
3159 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3160
3161 // some pointers to help with parsing
3162 char *buffer_end = buffer + buf_len;
3163 char *opt_hd = buffer;
3164 char *wrt = buffer;
3165 char *rd = buffer;
3166
3167 // parse all options
3168 while (rd < buffer_end) {
3169 // skip leading white space from the input string
3170 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3171 rd++;
3172 }
3173
3174 if (rd >= buffer_end) {
3175 break;
3176 }
3177
3178 // Remember this is where we found the head of the token.
3179 opt_hd = wrt;
3180
3181 // Tokens are strings of non white space characters separated
3182 // by one or more white spaces.
3183 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3184 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3185 int quote = *rd; // matching quote to look for
3186 rd++; // don't copy open quote
3187 while (rd < buffer_end && *rd != quote) {
3188 // include everything (even spaces)
3189 // up until the close quote
3190 *wrt++ = *rd++; // copy to option string
3191 }
3192
3193 if (rd < buffer_end) {
3194 rd++; // don't copy close quote
3195 } else {
3196 // did not see closing quote
3197 jio_fprintf(defaultStream::error_stream(),
3198 "Unmatched quote in %s\n", name);
3199 return JNI_ERR;
3200 }
3201 } else {
3202 *wrt++ = *rd++; // copy to option string
3203 }
3204 }
3205
3206 // steal a white space character and set it to null
3207 *wrt++ = '\0';
3208 // We now have a complete token
3209
3210 JavaVMOption option;
3211 option.optionString = opt_hd;
3212 option.extraInfo = nullptr;
3213
3214 options.append(option); // Fill in option
3215
3216 rd++; // Advance to next character
3217 }
3218
3219 // Fill out JavaVMInitArgs structure.
3220 return vm_args->set_args(&options);
3221 }
3222
3223 #ifndef PRODUCT
3224 // Determine whether LogVMOutput should be implicitly turned on.
3225 static bool use_vm_log() {
3226 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3227 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3228 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3229 PrintAssembly || TraceDeoptimization ||
3230 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3231 return true;
3232 }
3233
3234 #ifdef COMPILER1
3235 if (PrintC1Statistics) {
3236 return true;
3237 }
3238 #endif // COMPILER1
3239
3240 #ifdef COMPILER2
3241 if (PrintOptoAssembly || PrintOptoStatistics) {
3242 return true;
3243 }
3244 #endif // COMPILER2
3245
3246 return false;
3247 }
3248
3249 #endif // PRODUCT
3250
3251 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3252 for (int index = 0; index < args->nOptions; index++) {
3253 const JavaVMOption* option = args->options + index;
3254 const char* tail;
3255 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3256 return true;
3257 }
3258 }
3259 return false;
3260 }
3261
3262 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3263 const char* vm_options_file,
3264 const int vm_options_file_pos,
3265 ScopedVMInitArgs* vm_options_file_args,
3266 ScopedVMInitArgs* args_out) {
3267 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3268 if (code != JNI_OK) {
3269 return code;
3270 }
3271
3272 if (vm_options_file_args->get()->nOptions < 1) {
3273 return JNI_OK;
3274 }
3275
3276 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3277 jio_fprintf(defaultStream::error_stream(),
3278 "A VM options file may not refer to a VM options file. "
3279 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3280 "options file '%s' in options container '%s' is an error.\n",
3281 vm_options_file_args->vm_options_file_arg(),
3282 vm_options_file_args->container_name());
3283 return JNI_EINVAL;
3284 }
3285
3286 return args_out->insert(args, vm_options_file_args->get(),
3287 vm_options_file_pos);
3288 }
3289
3290 // Expand -XX:VMOptionsFile found in args_in as needed.
3291 // mod_args and args_out parameters may return values as needed.
3292 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3293 ScopedVMInitArgs* mod_args,
3294 JavaVMInitArgs** args_out) {
3295 jint code = match_special_option_and_act(args_in, mod_args);
3296 if (code != JNI_OK) {
3297 return code;
3298 }
3299
3300 if (mod_args->is_set()) {
3301 // args_in contains -XX:VMOptionsFile and mod_args contains the
3302 // original options from args_in along with the options expanded
3303 // from the VMOptionsFile. Return a short-hand to the caller.
3304 *args_out = mod_args->get();
3305 } else {
3306 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3307 }
3308 return JNI_OK;
3309 }
3310
3311 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3312 ScopedVMInitArgs* args_out) {
3313 // Remaining part of option string
3314 const char* tail;
3315 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3316
3317 for (int index = 0; index < args->nOptions; index++) {
3318 const JavaVMOption* option = args->options + index;
3319 if (match_option(option, "-XX:Flags=", &tail)) {
3320 Arguments::set_jvm_flags_file(tail);
3321 continue;
3322 }
3323 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3324 if (vm_options_file_args.found_vm_options_file_arg()) {
3325 jio_fprintf(defaultStream::error_stream(),
3326 "The option '%s' is already specified in the options "
3327 "container '%s' so the specification of '%s' in the "
3328 "same options container is an error.\n",
3329 vm_options_file_args.vm_options_file_arg(),
3330 vm_options_file_args.container_name(),
3331 option->optionString);
3332 return JNI_EINVAL;
3333 }
3334 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3335 // If there's a VMOptionsFile, parse that
3336 jint code = insert_vm_options_file(args, tail, index,
3337 &vm_options_file_args, args_out);
3338 if (code != JNI_OK) {
3339 return code;
3340 }
3341 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3342 if (args_out->is_set()) {
3343 // The VMOptions file inserted some options so switch 'args'
3344 // to the new set of options, and continue processing which
3345 // preserves "last option wins" semantics.
3346 args = args_out->get();
3347 // The first option from the VMOptionsFile replaces the
3348 // current option. So we back track to process the
3349 // replacement option.
3350 index--;
3351 }
3352 continue;
3353 }
3354 if (match_option(option, "-XX:+PrintVMOptions")) {
3355 PrintVMOptions = true;
3356 continue;
3357 }
3358 if (match_option(option, "-XX:-PrintVMOptions")) {
3359 PrintVMOptions = false;
3360 continue;
3361 }
3362 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3363 IgnoreUnrecognizedVMOptions = true;
3364 continue;
3365 }
3366 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3367 IgnoreUnrecognizedVMOptions = false;
3368 continue;
3369 }
3370 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3371 JVMFlag::printFlags(tty, false);
3372 vm_exit(0);
3373 }
3374
3375 #ifndef PRODUCT
3376 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3377 JVMFlag::printFlags(tty, true);
3378 vm_exit(0);
3379 }
3380 #endif
3381 }
3382 return JNI_OK;
3383 }
3384
3385 static void print_options(const JavaVMInitArgs *args) {
3386 const char* tail;
3387 for (int index = 0; index < args->nOptions; index++) {
3388 const JavaVMOption *option = args->options + index;
3389 if (match_option(option, "-XX:", &tail)) {
3390 logOption(tail);
3391 }
3392 }
3393 }
3394
3395 bool Arguments::handle_deprecated_print_gc_flags() {
3396 if (PrintGC) {
3397 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3398 }
3399 if (PrintGCDetails) {
3400 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3401 }
3402
3403 if (_legacyGCLogging.lastFlag == 2) {
3404 // -Xloggc was used to specify a filename
3405 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3406
3407 LogTarget(Error, logging) target;
3408 LogStream errstream(target);
3409 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3410 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3411 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3412 }
3413 return true;
3414 }
3415
3416 static void apply_debugger_ergo() {
3417 #ifdef ASSERT
3418 if (ReplayCompiles) {
3419 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3420 }
3421
3422 if (UseDebuggerErgo) {
3423 // Turn on sub-flags
3424 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3425 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3426 }
3427
3428 if (UseDebuggerErgo2) {
3429 // Debugging with limited number of CPUs
3430 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3431 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3432 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3433 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3434 }
3435 #endif // ASSERT
3436 }
3437
3438 // Parse entry point called from JNI_CreateJavaVM
3439
3440 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3441 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3442 JVMFlag::check_all_flag_declarations();
3443
3444 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3445 const char* hotspotrc = ".hotspotrc";
3446 bool settings_file_specified = false;
3447 bool needs_hotspotrc_warning = false;
3448 ScopedVMInitArgs initial_vm_options_args("");
3449 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3450 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3451
3452 // Pointers to current working set of containers
3453 JavaVMInitArgs* cur_cmd_args;
3454 JavaVMInitArgs* cur_vm_options_args;
3455 JavaVMInitArgs* cur_java_options_args;
3456 JavaVMInitArgs* cur_java_tool_options_args;
3457
3458 // Containers for modified/expanded options
3459 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3460 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3461 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3462 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3463
3464
3465 jint code =
3466 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3467 if (code != JNI_OK) {
3468 return code;
3469 }
3470
3471 code = parse_java_options_environment_variable(&initial_java_options_args);
3472 if (code != JNI_OK) {
3473 return code;
3474 }
3475
3476 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3477 char *vmoptions = ClassLoader::lookup_vm_options();
3478 if (vmoptions != nullptr) {
3479 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3480 FREE_C_HEAP_ARRAY(char, vmoptions);
3481 if (code != JNI_OK) {
3482 return code;
3483 }
3484 }
3485
3486 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3487 &mod_java_tool_options_args,
3488 &cur_java_tool_options_args);
3489 if (code != JNI_OK) {
3490 return code;
3491 }
3492
3493 code = expand_vm_options_as_needed(initial_cmd_args,
3494 &mod_cmd_args,
3495 &cur_cmd_args);
3496 if (code != JNI_OK) {
3497 return code;
3498 }
3499
3500 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3501 &mod_java_options_args,
3502 &cur_java_options_args);
3503 if (code != JNI_OK) {
3504 return code;
3505 }
3506
3507 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3508 &mod_vm_options_args,
3509 &cur_vm_options_args);
3510 if (code != JNI_OK) {
3511 return code;
3512 }
3513
3514 const char* flags_file = Arguments::get_jvm_flags_file();
3515 settings_file_specified = (flags_file != nullptr);
3516
3517 if (IgnoreUnrecognizedVMOptions) {
3518 cur_cmd_args->ignoreUnrecognized = true;
3519 cur_java_tool_options_args->ignoreUnrecognized = true;
3520 cur_java_options_args->ignoreUnrecognized = true;
3521 }
3522
3523 // Parse specified settings file
3524 if (settings_file_specified) {
3525 if (!process_settings_file(flags_file, true,
3526 cur_cmd_args->ignoreUnrecognized)) {
3527 return JNI_EINVAL;
3528 }
3529 } else {
3530 #ifdef ASSERT
3531 // Parse default .hotspotrc settings file
3532 if (!process_settings_file(".hotspotrc", false,
3533 cur_cmd_args->ignoreUnrecognized)) {
3534 return JNI_EINVAL;
3535 }
3536 #else
3537 struct stat buf;
3538 if (os::stat(hotspotrc, &buf) == 0) {
3539 needs_hotspotrc_warning = true;
3540 }
3541 #endif
3542 }
3543
3544 if (PrintVMOptions) {
3545 print_options(cur_java_tool_options_args);
3546 print_options(cur_cmd_args);
3547 print_options(cur_java_options_args);
3548 }
3549
3550 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3551 jint result = parse_vm_init_args(cur_vm_options_args,
3552 cur_java_tool_options_args,
3553 cur_java_options_args,
3554 cur_cmd_args);
3555
3556 if (result != JNI_OK) {
3557 return result;
3558 }
3559
3560 // Delay warning until here so that we've had a chance to process
3561 // the -XX:-PrintWarnings flag
3562 if (needs_hotspotrc_warning) {
3563 warning("%s file is present but has been ignored. "
3564 "Run with -XX:Flags=%s to load the file.",
3565 hotspotrc, hotspotrc);
3566 }
3567
3568 if (needs_module_property_warning) {
3569 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3570 " names that are reserved for internal use.");
3571 }
3572
3573 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3574 UNSUPPORTED_OPTION(UseLargePages);
3575 #endif
3576
3577 #if defined(AIX)
3578 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3579 #endif
3580
3581 #ifndef PRODUCT
3582 if (TraceBytecodesAt != 0) {
3583 TraceBytecodes = true;
3584 }
3585 #endif // PRODUCT
3586
3587 if (ScavengeRootsInCode == 0) {
3588 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3589 warning("Forcing ScavengeRootsInCode non-zero");
3590 }
3591 ScavengeRootsInCode = 1;
3592 }
3593
3594 if (!handle_deprecated_print_gc_flags()) {
3595 return JNI_EINVAL;
3596 }
3597
3598 // Set object alignment values.
3599 set_object_alignment();
3600
3601 #if !INCLUDE_CDS
3602 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3603 jio_fprintf(defaultStream::error_stream(),
3604 "Shared spaces are not supported in this VM\n");
3605 return JNI_ERR;
3606 }
3607 if (DumpLoadedClassList != nullptr) {
3608 jio_fprintf(defaultStream::error_stream(),
3609 "DumpLoadedClassList is not supported in this VM\n");
3610 return JNI_ERR;
3611 }
3612 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3613 log_is_enabled(Info, cds)) {
3614 warning("Shared spaces are not supported in this VM");
3615 UseSharedSpaces = false;
3616 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3617 }
3618 no_shared_spaces("CDS Disabled");
3619 #endif // INCLUDE_CDS
3620
3621 // Verify NMT arguments
3622 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3623 if (lvl == NMT_unknown) {
3624 jio_fprintf(defaultStream::error_stream(),
3625 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3626 return JNI_ERR;
3627 }
3628 if (PrintNMTStatistics && lvl == NMT_off) {
3629 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3630 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3631 }
3632
3633 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3634 if (trace_dependencies && VerifyDependencies) {
3635 warning("dependency logging results may be inflated by VerifyDependencies");
3636 }
3637
3638 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3639 log_is_enabled(Info, class, load, cause);
3640 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3641 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3642 }
3643
3644 apply_debugger_ergo();
3645
3646 // The VMThread needs to stop now and then to execute these debug options.
3647 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3648 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3649 }
3650
3651 if (log_is_enabled(Info, arguments)) {
3652 LogStream st(Log(arguments)::info());
3653 Arguments::print_on(&st);
3654 }
3655
3656 return JNI_OK;
3657 }
3658
3659 jint Arguments::apply_ergo() {
3660 // Set flags based on ergonomics.
3661 jint result = set_ergonomics_flags();
3662 if (result != JNI_OK) return result;
3663
3664 // Set heap size based on available physical memory
3665 set_heap_size();
3666
3667 GCConfig::arguments()->initialize();
3668
3669 if (UseCompressedClassPointers) {
3670 CompressedKlassPointers::pre_initialize();
3671 }
3672
3673 CDSConfig::initialize();
3674
3675 // Initialize Metaspace flags and alignments
3676 Metaspace::ergo_initialize();
3677
3678 if (!StringDedup::ergo_initialize()) {
3679 return JNI_EINVAL;
3680 }
3681
3682 // Set compiler flags after GC is selected and GC specific
3683 // flags (LoopStripMiningIter) are set.
3684 CompilerConfig::ergo_initialize();
3685
3686 // Set bytecode rewriting flags
3687 set_bytecode_flags();
3688
3689 // Set flags if aggressive optimization flags are enabled
3690 jint code = set_aggressive_opts_flags();
3691 if (code != JNI_OK) {
3692 return code;
3693 }
3694
3695 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3696 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3697 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3698 warning("UseSecondarySupersTable is not supported");
3699 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3700 }
3701 if (!UseSecondarySupersTable) {
3702 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3703 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3704 }
3705
3706 #ifdef ZERO
3707 // Clear flags not supported on zero.
3708 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3709 #endif // ZERO
3710
3711 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3712 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3713 DebugNonSafepoints = true;
3714 }
3715
3716 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3717 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3718 }
3719
3720 // Treat the odd case where local verification is enabled but remote
3721 // verification is not as if both were enabled.
3722 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3723 log_info(verification)("Turning on remote verification because local verification is on");
3724 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3725 }
3726
3727 #ifndef PRODUCT
3728 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3729 if (use_vm_log()) {
3730 LogVMOutput = true;
3731 }
3732 }
3733 #endif // PRODUCT
3734
3735 if (PrintCommandLineFlags) {
3736 JVMFlag::printSetFlags(tty);
3737 }
3738
3739 #if COMPILER2_OR_JVMCI
3740 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3741 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3742 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3743 }
3744 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3745
3746 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3747 if (!EnableVectorReboxing) {
3748 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3749 } else {
3750 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3751 }
3752 }
3753 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3754
3755 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3756 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3757 }
3758 FLAG_SET_DEFAULT(UseVectorStubs, false);
3759 }
3760 #endif // COMPILER2_OR_JVMCI
3761
3762 if (log_is_enabled(Info, perf, class, link)) {
3763 if (!UsePerfData) {
3764 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3765 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3766 }
3767 }
3768
3769 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3770 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3771 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3772 }
3773 }
3774 return JNI_OK;
3775 }
3776
3777 jint Arguments::adjust_after_os() {
3778 if (UseNUMA) {
3779 if (UseParallelGC) {
3780 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3781 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3782 }
3783 }
3784 }
3785 return JNI_OK;
3786 }
3787
3788 int Arguments::PropertyList_count(SystemProperty* pl) {
3789 int count = 0;
3790 while(pl != nullptr) {
3791 count++;
3792 pl = pl->next();
3793 }
3794 return count;
3795 }
3796
3797 // Return the number of readable properties.
3798 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3799 int count = 0;
3800 while(pl != nullptr) {
3801 if (pl->readable()) {
3802 count++;
3803 }
3804 pl = pl->next();
3805 }
3806 return count;
3807 }
3808
3809 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3810 assert(key != nullptr, "just checking");
3811 SystemProperty* prop;
3812 for (prop = pl; prop != nullptr; prop = prop->next()) {
3813 if (strcmp(key, prop->key()) == 0) return prop->value();
3814 }
3815 return nullptr;
3816 }
3817
3818 // Return the value of the requested property provided that it is a readable property.
3819 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3820 assert(key != nullptr, "just checking");
3821 SystemProperty* prop;
3822 // Return the property value if the keys match and the property is not internal or
3823 // it's the special internal property "jdk.boot.class.path.append".
3824 for (prop = pl; prop != nullptr; prop = prop->next()) {
3825 if (strcmp(key, prop->key()) == 0) {
3826 if (!prop->internal()) {
3827 return prop->value();
3828 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3829 return prop->value();
3830 } else {
3831 // Property is internal and not jdk.boot.class.path.append so return null.
3832 return nullptr;
3833 }
3834 }
3835 }
3836 return nullptr;
3837 }
3838
3839 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3840 SystemProperty* p = *plist;
3841 if (p == nullptr) {
3842 *plist = new_p;
3843 } else {
3844 while (p->next() != nullptr) {
3845 p = p->next();
3846 }
3847 p->set_next(new_p);
3848 }
3849 }
3850
3851 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3852 bool writeable, bool internal) {
3853 if (plist == nullptr)
3854 return;
3855
3856 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3857 PropertyList_add(plist, new_p);
3858 }
3859
3860 void Arguments::PropertyList_add(SystemProperty *element) {
3861 PropertyList_add(&_system_properties, element);
3862 }
3863
3864 // This add maintains unique property key in the list.
3865 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3866 PropertyAppendable append, PropertyWriteable writeable,
3867 PropertyInternal internal) {
3868 if (plist == nullptr)
3869 return;
3870
3871 // If property key exists and is writeable, then update with new value.
3872 // Trying to update a non-writeable property is silently ignored.
3873 SystemProperty* prop;
3874 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3875 if (strcmp(k, prop->key()) == 0) {
3876 if (append == AppendProperty) {
3877 prop->append_writeable_value(v);
3878 } else {
3879 prop->set_writeable_value(v);
3880 }
3881 return;
3882 }
3883 }
3884
3885 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3886 }
3887
3888 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3889 // Returns true if all of the source pointed by src has been copied over to
3890 // the destination buffer pointed by buf. Otherwise, returns false.
3891 // Notes:
3892 // 1. If the length (buflen) of the destination buffer excluding the
3893 // null terminator character is not long enough for holding the expanded
3894 // pid characters, it also returns false instead of returning the partially
3895 // expanded one.
3896 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3897 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3898 char* buf, size_t buflen) {
3899 const char* p = src;
3900 char* b = buf;
3901 const char* src_end = &src[srclen];
3902 char* buf_end = &buf[buflen - 1];
3903
3904 while (p < src_end && b < buf_end) {
3905 if (*p == '%') {
3906 switch (*(++p)) {
3907 case '%': // "%%" ==> "%"
3908 *b++ = *p++;
3909 break;
3910 case 'p': { // "%p" ==> current process id
3911 // buf_end points to the character before the last character so
3912 // that we could write '\0' to the end of the buffer.
3913 size_t buf_sz = buf_end - b + 1;
3914 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3915
3916 // if jio_snprintf fails or the buffer is not long enough to hold
3917 // the expanded pid, returns false.
3918 if (ret < 0 || ret >= (int)buf_sz) {
3919 return false;
3920 } else {
3921 b += ret;
3922 assert(*b == '\0', "fail in copy_expand_pid");
3923 if (p == src_end && b == buf_end + 1) {
3924 // reach the end of the buffer.
3925 return true;
3926 }
3927 }
3928 p++;
3929 break;
3930 }
3931 default :
3932 *b++ = '%';
3933 }
3934 } else {
3935 *b++ = *p++;
3936 }
3937 }
3938 *b = '\0';
3939 return (p == src_end); // return false if not all of the source was copied
3940 }