1 /*
2 * Copyright (c) 1997, 2021, 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 "jvm.h"
27 #include "cds/filemap.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "gc/shared/gcArguments.hpp"
35 #include "gc/shared/gcConfig.hpp"
36 #include "gc/shared/stringdedup/stringDedup.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logConfiguration.hpp"
40 #include "logging/logStream.hpp"
41 #include "logging/logTag.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "prims/jvmtiExport.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/flags/jvmFlag.hpp"
47 #include "runtime/flags/jvmFlagAccess.hpp"
48 #include "runtime/flags/jvmFlagLimit.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.hpp"
52 #include "runtime/safepoint.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/nmtCommon.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/powerOfTwo.hpp"
61 #include "utilities/stringUtils.hpp"
62 #if INCLUDE_JFR
63 #include "jfr/jfr.hpp"
64 #endif
65
66 #define DEFAULT_JAVA_LAUNCHER "generic"
67
68 char* Arguments::_jvm_flags_file = NULL;
69 char** Arguments::_jvm_flags_array = NULL;
70 int Arguments::_num_jvm_flags = 0;
71 char** Arguments::_jvm_args_array = NULL;
72 int Arguments::_num_jvm_args = 0;
73 char* Arguments::_java_command = NULL;
74 SystemProperty* Arguments::_system_properties = NULL;
75 size_t Arguments::_conservative_max_heap_alignment = 0;
76 Arguments::Mode Arguments::_mode = _mixed;
77 bool Arguments::_java_compiler = false;
78 bool Arguments::_xdebug_mode = false;
79 const char* Arguments::_java_vendor_url_bug = NULL;
80 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
81 bool Arguments::_sun_java_launcher_is_altjvm = false;
82
83 // These parameters are reset in method parse_vm_init_args()
84 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
85 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
86 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
87 bool Arguments::_ClipInlining = ClipInlining;
88 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
89
90 bool Arguments::_enable_preview = false;
91
92 char* Arguments::SharedArchivePath = NULL;
93 char* Arguments::SharedDynamicArchivePath = NULL;
94
95 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
96
97 AgentLibraryList Arguments::_libraryList;
98 AgentLibraryList Arguments::_agentList;
99
100 // These are not set by the JDK's built-in launchers, but they can be set by
101 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
102 // JavaVMOption in jni.h.
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113 SystemProperty *Arguments::_vm_info = NULL;
114
115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
116 PathString *Arguments::_system_boot_class_path = NULL;
117 bool Arguments::_has_jimage = false;
118
119 char* Arguments::_ext_dirs = NULL;
120
121 bool PathString::set_value(const char *value) {
122 if (_value != NULL) {
123 FreeHeap(_value);
124 }
125 _value = AllocateHeap(strlen(value)+1, mtArguments);
126 assert(_value != NULL, "Unable to allocate space for new path value");
127 if (_value != NULL) {
128 strcpy(_value, value);
129 } else {
130 // not able to allocate
131 return false;
132 }
133 return true;
134 }
135
136 void PathString::append_value(const char *value) {
137 char *sp;
138 size_t len = 0;
139 if (value != NULL) {
140 len = strlen(value);
141 if (_value != NULL) {
142 len += strlen(_value);
143 }
144 sp = AllocateHeap(len+2, mtArguments);
145 assert(sp != NULL, "Unable to allocate space for new append path value");
146 if (sp != NULL) {
147 if (_value != NULL) {
148 strcpy(sp, _value);
149 strcat(sp, os::path_separator());
150 strcat(sp, value);
151 FreeHeap(_value);
152 } else {
153 strcpy(sp, value);
154 }
155 _value = sp;
156 }
157 }
158 }
159
160 PathString::PathString(const char* value) {
161 if (value == NULL) {
162 _value = NULL;
163 } else {
164 _value = AllocateHeap(strlen(value)+1, mtArguments);
165 strcpy(_value, value);
166 }
167 }
168
169 PathString::~PathString() {
170 if (_value != NULL) {
171 FreeHeap(_value);
172 _value = NULL;
173 }
174 }
175
176 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
177 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
178 size_t len = strlen(module_name) + 1;
179 _module_name = AllocateHeap(len, mtInternal);
180 strncpy(_module_name, module_name, len); // copy the trailing null
181 _path = new PathString(path);
182 }
183
184 ModulePatchPath::~ModulePatchPath() {
185 if (_module_name != NULL) {
186 FreeHeap(_module_name);
187 _module_name = NULL;
188 }
189 if (_path != NULL) {
190 delete _path;
191 _path = NULL;
192 }
193 }
194
195 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
196 if (key == NULL) {
197 _key = NULL;
198 } else {
199 _key = AllocateHeap(strlen(key)+1, mtArguments);
200 strcpy(_key, key);
201 }
202 _next = NULL;
203 _internal = internal;
204 _writeable = writeable;
205 }
206
207 AgentLibrary::AgentLibrary(const char* name, const char* options,
208 bool is_absolute_path, void* os_lib,
209 bool instrument_lib) {
210 _name = AllocateHeap(strlen(name)+1, mtArguments);
211 strcpy(_name, name);
212 if (options == NULL) {
213 _options = NULL;
214 } else {
215 _options = AllocateHeap(strlen(options)+1, mtArguments);
216 strcpy(_options, options);
217 }
218 _is_absolute_path = is_absolute_path;
219 _os_lib = os_lib;
220 _next = NULL;
221 _state = agent_invalid;
222 _is_static_lib = false;
223 _is_instrument_lib = instrument_lib;
224 }
225
226 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
227 // part of the option string.
228 static bool match_option(const JavaVMOption *option, const char* name,
229 const char** tail) {
230 size_t len = strlen(name);
231 if (strncmp(option->optionString, name, len) == 0) {
232 *tail = option->optionString + len;
233 return true;
234 } else {
235 return false;
236 }
237 }
238
239 // Check if 'option' matches 'name'. No "tail" is allowed.
240 static bool match_option(const JavaVMOption *option, const char* name) {
241 const char* tail = NULL;
242 bool result = match_option(option, name, &tail);
243 if (tail != NULL && *tail == '\0') {
244 return result;
245 } else {
246 return false;
247 }
248 }
249
250 // Return true if any of the strings in null-terminated array 'names' matches.
251 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
252 // the option must match exactly.
253 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
254 bool tail_allowed) {
255 for (/* empty */; *names != NULL; ++names) {
256 if (match_option(option, *names, tail)) {
257 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
258 return true;
259 }
260 }
261 }
262 return false;
263 }
264
265 #if INCLUDE_JFR
266 static bool _has_jfr_option = false; // is using JFR
267
268 // return true on failure
269 static bool match_jfr_option(const JavaVMOption** option) {
270 assert((*option)->optionString != NULL, "invariant");
271 char* tail = NULL;
272 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
273 _has_jfr_option = true;
274 return Jfr::on_start_flight_recording_option(option, tail);
275 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
276 _has_jfr_option = true;
277 return Jfr::on_flight_recorder_option(option, tail);
278 }
279 return false;
280 }
281
282 bool Arguments::has_jfr_option() {
283 return _has_jfr_option;
284 }
285 #endif
286
287 static void logOption(const char* opt) {
288 if (PrintVMOptions) {
289 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
290 }
291 }
292
293 bool needs_module_property_warning = false;
294
295 #define MODULE_PROPERTY_PREFIX "jdk.module."
296 #define MODULE_PROPERTY_PREFIX_LEN 11
297 #define ADDEXPORTS "addexports"
298 #define ADDEXPORTS_LEN 10
299 #define ADDREADS "addreads"
300 #define ADDREADS_LEN 8
301 #define ADDOPENS "addopens"
302 #define ADDOPENS_LEN 8
303 #define PATCH "patch"
304 #define PATCH_LEN 5
305 #define ADDMODS "addmods"
306 #define ADDMODS_LEN 7
307 #define LIMITMODS "limitmods"
308 #define LIMITMODS_LEN 9
309 #define PATH "path"
310 #define PATH_LEN 4
311 #define UPGRADE_PATH "upgrade.path"
312 #define UPGRADE_PATH_LEN 12
313 #define ENABLE_NATIVE_ACCESS "enable.native.access"
314 #define ENABLE_NATIVE_ACCESS_LEN 20
315
316 void Arguments::add_init_library(const char* name, char* options) {
317 _libraryList.add(new AgentLibrary(name, options, false, NULL));
318 }
319
320 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
322 }
323
324 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
325 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
326 }
327
328 // Late-binding agents not started via arguments
329 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
330 _agentList.add(agentLib);
331 }
332
333 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
334 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
335 return ((strncmp(option, property, len) == 0) &&
336 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
337 }
338
339 // Return true if property starts with "jdk.module." and its ensuing chars match
340 // any of the reserved module properties.
341 // property should be passed without the leading "-D".
342 bool Arguments::is_internal_module_property(const char* property) {
343 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
347 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
348 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
349 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
350 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
351 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
352 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
353 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
354 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
355 return true;
356 }
357 }
358 return false;
359 }
360
361 // Process java launcher properties.
362 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
363 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
364 // Must do this before setting up other system properties,
365 // as some of them may depend on launcher type.
366 for (int index = 0; index < args->nOptions; index++) {
367 const JavaVMOption* option = args->options + index;
368 const char* tail;
369
370 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
371 process_java_launcher_argument(tail, option->extraInfo);
372 continue;
373 }
374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
375 if (strcmp(tail, "true") == 0) {
376 _sun_java_launcher_is_altjvm = true;
377 }
378 continue;
379 }
380 }
381 }
382
383 // Initialize system properties key and value.
384 void Arguments::init_system_properties() {
385
386 // Set up _system_boot_class_path which is not a property but
387 // relies heavily on argument processing and the jdk.boot.class.path.append
388 // property. It is used to store the underlying system boot class path.
389 _system_boot_class_path = new PathString(NULL);
390
391 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
392 "Java Virtual Machine Specification", false));
393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
394 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
395 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
396
397 // Initialize the vm.info now, but it will need updating after argument parsing.
398 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
399
400 // Following are JVMTI agent writable properties.
401 // Properties values are set to NULL and they are
402 // os specific they are initialized in os::init_system_properties_values().
403 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
404 _java_library_path = new SystemProperty("java.library.path", NULL, true);
405 _java_home = new SystemProperty("java.home", NULL, true);
406 _java_class_path = new SystemProperty("java.class.path", "", true);
407 // jdk.boot.class.path.append is a non-writeable, internal property.
408 // It can only be set by either:
409 // - -Xbootclasspath/a:
410 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
411 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
412
413 // Add to System Property list.
414 PropertyList_add(&_system_properties, _sun_boot_library_path);
415 PropertyList_add(&_system_properties, _java_library_path);
416 PropertyList_add(&_system_properties, _java_home);
417 PropertyList_add(&_system_properties, _java_class_path);
418 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
419 PropertyList_add(&_system_properties, _vm_info);
420
421 // Set OS specific system properties values
422 os::init_system_properties_values();
423 }
424
425 // Update/Initialize System properties after JDK version number is known
426 void Arguments::init_version_specific_system_properties() {
427 enum { bufsz = 16 };
428 char buffer[bufsz];
429 const char* spec_vendor = "Oracle Corporation";
430 uint32_t spec_version = JDK_Version::current().major_version();
431
432 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
433
434 PropertyList_add(&_system_properties,
435 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
436 PropertyList_add(&_system_properties,
437 new SystemProperty("java.vm.specification.version", buffer, false));
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
440 }
441
442 /*
443 * -XX argument processing:
444 *
445 * -XX arguments are defined in several places, such as:
446 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
447 * -XX arguments are parsed in parse_argument().
448 * -XX argument bounds checking is done in check_vm_args_consistency().
449 *
450 * Over time -XX arguments may change. There are mechanisms to handle common cases:
451 *
452 * ALIASED: An option that is simply another name for another option. This is often
453 * part of the process of deprecating a flag, but not all aliases need
454 * to be deprecated.
455 *
456 * Create an alias for an option by adding the old and new option names to the
457 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
458 *
459 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
460 * support may be removed in the future. Both regular and aliased options may be
461 * deprecated.
462 *
463 * Add a deprecation warning for an option (or alias) by adding an entry in the
464 * "special_jvm_flags" table and setting the "deprecated_in" field.
465 * Often an option "deprecated" in one major release will
466 * be made "obsolete" in the next. In this case the entry should also have its
467 * "obsolete_in" field set.
468 *
469 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
470 * on the command line. A warning is printed to let the user know that option might not
471 * be accepted in the future.
472 *
473 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
474 * table and setting the "obsolete_in" field.
475 *
476 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
477 * to the current JDK version. The system will flatly refuse to admit the existence of
478 * the flag. This allows a flag to die automatically over JDK releases.
479 *
480 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
481 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
482 * - Newly obsolete or expired deprecated options should have their global variable
483 * definitions removed (from globals.hpp, etc) and related implementations removed.
484 *
485 * Recommended approach for removing options:
486 *
487 * To remove options commonly used by customers (e.g. product -XX options), use
488 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
489 *
490 * To remove internal options (e.g. diagnostic, experimental, develop options), use
491 * a 2-step model adding major release numbers to the obsolete and expire columns.
492 *
493 * To change the name of an option, use the alias table as well as a 2-step
494 * model adding major release numbers to the deprecate and expire columns.
495 * Think twice about aliasing commonly used customer options.
496 *
497 * There are times when it is appropriate to leave a future release number as undefined.
498 *
499 * Tests: Aliases should be tested in VMAliasOptions.java.
500 * Deprecated options should be tested in VMDeprecatedOptions.java.
501 */
502
503 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
504 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
505 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
506 // the command-line as usual, but will issue a warning.
507 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
508 // the command-line, while issuing a warning and ignoring the flag value.
509 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
510 // existence of the flag.
511 //
512 // MANUAL CLEANUP ON JDK VERSION UPDATES:
513 // This table ensures that the handling of options will update automatically when the JDK
514 // version is incremented, but the source code needs to be cleanup up manually:
515 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
516 // variable should be removed, as well as users of the variable.
517 // - As "deprecated" options age into "obsolete" options, move the entry into the
518 // "Obsolete Flags" section of the table.
519 // - All expired options should be removed from the table.
520 static SpecialFlag const special_jvm_flags[] = {
521 // -------------- Deprecated Flags --------------
522 // --- Non-alias flags - sorted by obsolete_in then expired_in:
523 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
529 { "FilterSpuriousWakeups", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
530 { "MinInliningThreshold", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
531 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
532 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
533 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
534 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535
536 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
537 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
538 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
540
541 // -------------- Obsolete Flags - sorted by expired_in --------------
542 { "CriticalJNINatives", JDK_Version::jdk(16), JDK_Version::jdk(18), JDK_Version::jdk(19) },
543 { "InlineFrequencyCount", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::jdk(19) },
544 { "G1RSetRegionEntries", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::jdk(19) },
545 { "G1RSetSparseRegionEntries", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::jdk(19) },
546 { "AlwaysLockClassLoader", JDK_Version::jdk(17), JDK_Version::jdk(18), JDK_Version::jdk(19) },
547 { "UseBiasedLocking", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
548 { "BiasedLockingStartupDelay", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
549 { "PrintBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
550 { "BiasedLockingBulkRebiasThreshold", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
551 { "BiasedLockingBulkRevokeThreshold", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
552 { "BiasedLockingDecayTime", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
553 { "UseOptoBiasInlining", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
554 { "PrintPreciseBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
555 #ifdef ASSERT
556 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
557 #endif
558
559 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
560 // These entries will generate build errors. Their purpose is to test the macros.
561 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
562 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
563 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
564 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
565 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
566 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
567 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
568 #endif
569
570 { NULL, JDK_Version(0), JDK_Version(0) }
571 };
572
573 // Flags that are aliases for other flags.
574 typedef struct {
575 const char* alias_name;
576 const char* real_name;
577 } AliasedFlag;
578
579 static AliasedFlag const aliased_jvm_flags[] = {
580 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
581 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
582 { NULL, NULL}
583 };
584
585 // Return true if "v" is less than "other", where "other" may be "undefined".
586 static bool version_less_than(JDK_Version v, JDK_Version other) {
587 assert(!v.is_undefined(), "must be defined");
588 if (!other.is_undefined() && v.compare(other) >= 0) {
589 return false;
590 } else {
591 return true;
592 }
593 }
594
595 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
596 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
597 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
598 flag = special_jvm_flags[i];
599 return true;
600 }
601 }
602 return false;
603 }
604
605 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
606 assert(version != NULL, "Must provide a version buffer");
607 SpecialFlag flag;
608 if (lookup_special_flag(flag_name, flag)) {
609 if (!flag.obsolete_in.is_undefined()) {
610 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
611 *version = flag.obsolete_in;
612 // This flag may have been marked for obsoletion in this version, but we may not
613 // have actually removed it yet. Rather than ignoring it as soon as we reach
614 // this version we allow some time for the removal to happen. So if the flag
615 // still actually exists we process it as normal, but issue an adjusted warning.
616 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
617 if (real_flag != NULL) {
618 char version_str[256];
619 version->to_string(version_str, sizeof(version_str));
620 warning("Temporarily processing option %s; support is scheduled for removal in %s",
621 flag_name, version_str);
622 return false;
623 }
624 return true;
625 }
626 }
627 }
628 return false;
629 }
630
631 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
632 assert(version != NULL, "Must provide a version buffer");
633 SpecialFlag flag;
634 if (lookup_special_flag(flag_name, flag)) {
635 if (!flag.deprecated_in.is_undefined()) {
636 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
637 version_less_than(JDK_Version::current(), flag.expired_in)) {
638 *version = flag.deprecated_in;
639 return 1;
640 } else {
641 return -1;
642 }
643 }
644 }
645 return 0;
646 }
647
648 const char* Arguments::real_flag_name(const char *flag_name) {
649 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
650 const AliasedFlag& flag_status = aliased_jvm_flags[i];
651 if (strcmp(flag_status.alias_name, flag_name) == 0) {
652 return flag_status.real_name;
653 }
654 }
655 return flag_name;
656 }
657
658 #ifdef ASSERT
659 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
660 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
661 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
662 return true;
663 }
664 }
665 return false;
666 }
667
668 // Verifies the correctness of the entries in the special_jvm_flags table.
669 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
670 // version being earlier than the deprecation version, then a warning is issued
671 // and verification fails - by returning false. If it is detected that the table
672 // is out of date, with respect to the current version, then ideally a warning is
673 // issued but verification does not fail. This allows the VM to operate when the
674 // version is first updated, without needing to update all the impacted flags at
675 // the same time. In practice we can't issue the warning immediately when the version
676 // is updated as it occurs for every test and some tests are not prepared to handle
677 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
678 // if the check_globals flag is true, and in addition allow a grace period and only
679 // check for stale flags when we hit build 25 (which is far enough into the 6 month
680 // release cycle that all flag updates should have been processed, whilst still
681 // leaving time to make the change before RDP2).
682 // We use a gtest to call this, passing true, so that we can detect stale flags before
683 // the end of the release cycle.
684
685 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
686
687 bool Arguments::verify_special_jvm_flags(bool check_globals) {
688 bool success = true;
689 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
690 const SpecialFlag& flag = special_jvm_flags[i];
691 if (lookup_special_flag(flag.name, i)) {
692 warning("Duplicate special flag declaration \"%s\"", flag.name);
693 success = false;
694 }
695 if (flag.deprecated_in.is_undefined() &&
696 flag.obsolete_in.is_undefined()) {
697 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
698 success = false;
699 }
700
701 if (!flag.deprecated_in.is_undefined()) {
702 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
703 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
704 success = false;
705 }
706
707 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
708 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
709 success = false;
710 }
711 }
712
713 if (!flag.obsolete_in.is_undefined()) {
714 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
715 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
716 success = false;
717 }
718
719 // if flag has become obsolete it should not have a "globals" flag defined anymore.
720 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
721 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
722 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
723 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
724 success = false;
725 }
726 }
727
728 } else if (!flag.expired_in.is_undefined()) {
729 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
730 success = false;
731 }
732
733 if (!flag.expired_in.is_undefined()) {
734 // if flag has become expired it should not have a "globals" flag defined anymore.
735 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
736 !version_less_than(JDK_Version::current(), flag.expired_in)) {
737 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
738 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
739 success = false;
740 }
741 }
742 }
743 }
744 return success;
745 }
746 #endif
747
748 // Parses a size specification string.
749 bool Arguments::atojulong(const char *s, julong* result) {
750 julong n = 0;
751
752 // First char must be a digit. Don't allow negative numbers or leading spaces.
753 if (!isdigit(*s)) {
754 return false;
755 }
756
757 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
758 char* remainder;
759 errno = 0;
760 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
761 if (errno != 0) {
762 return false;
763 }
764
765 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
766 if (remainder == s || strlen(remainder) > 1) {
767 return false;
768 }
769
770 switch (*remainder) {
771 case 'T': case 't':
772 *result = n * G * K;
773 // Check for overflow.
774 if (*result/((julong)G * K) != n) return false;
775 return true;
776 case 'G': case 'g':
777 *result = n * G;
778 if (*result/G != n) return false;
779 return true;
780 case 'M': case 'm':
781 *result = n * M;
782 if (*result/M != n) return false;
783 return true;
784 case 'K': case 'k':
785 *result = n * K;
786 if (*result/K != n) return false;
787 return true;
788 case '\0':
789 *result = n;
790 return true;
791 default:
792 return false;
793 }
794 }
795
796 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
797 if (size < min_size) return arg_too_small;
798 if (size > max_size) return arg_too_big;
799 return arg_in_range;
800 }
801
802 // Describe an argument out of range error
803 void Arguments::describe_range_error(ArgsRange errcode) {
804 switch(errcode) {
805 case arg_too_big:
806 jio_fprintf(defaultStream::error_stream(),
807 "The specified size exceeds the maximum "
808 "representable size.\n");
809 break;
810 case arg_too_small:
811 case arg_unreadable:
812 case arg_in_range:
813 // do nothing for now
814 break;
815 default:
816 ShouldNotReachHere();
817 }
818 }
819
820 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
821 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
822 return true;
823 } else {
824 return false;
825 }
826 }
827
828 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) {
829 char* end;
830 errno = 0;
831 double v = strtod(value, &end);
832 if ((errno != 0) || (*end != 0)) {
833 return false;
834 }
835
836 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
837 return true;
838 }
839 return false;
840 }
841
842 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) {
843 julong v;
844 int int_v;
845 intx intx_v;
846 bool is_neg = false;
847
848 if (flag == NULL) {
849 return false;
850 }
851
852 // Check the sign first since atojulong() parses only unsigned values.
853 if (*value == '-') {
854 if (!flag->is_intx() && !flag->is_int()) {
855 return false;
856 }
857 value++;
858 is_neg = true;
859 }
860 if (!Arguments::atojulong(value, &v)) {
861 return false;
862 }
863 if (flag->is_int()) {
864 int_v = (int) v;
865 if (is_neg) {
866 int_v = -int_v;
867 }
868 return JVMFlagAccess::set_int(flag, &int_v, origin) == JVMFlag::SUCCESS;
869 } else if (flag->is_uint()) {
870 uint uint_v = (uint) v;
871 return JVMFlagAccess::set_uint(flag, &uint_v, origin) == JVMFlag::SUCCESS;
872 } else if (flag->is_intx()) {
873 intx_v = (intx) v;
874 if (is_neg) {
875 intx_v = -intx_v;
876 }
877 return JVMFlagAccess::set_intx(flag, &intx_v, origin) == JVMFlag::SUCCESS;
878 } else if (flag->is_uintx()) {
879 uintx uintx_v = (uintx) v;
880 return JVMFlagAccess::set_uintx(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
881 } else if (flag->is_uint64_t()) {
882 uint64_t uint64_t_v = (uint64_t) v;
883 return JVMFlagAccess::set_uint64_t(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
884 } else if (flag->is_size_t()) {
885 size_t size_t_v = (size_t) v;
886 return JVMFlagAccess::set_size_t(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
887 } else if (flag->is_double()) {
888 double double_v = (double) v;
889 return JVMFlagAccess::set_double(flag, &double_v, origin) == JVMFlag::SUCCESS;
890 } else {
891 return false;
892 }
893 }
894
895 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
896 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
897 // Contract: JVMFlag always returns a pointer that needs freeing.
898 FREE_C_HEAP_ARRAY(char, value);
899 return true;
900 }
901
902 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
903 const char* old_value = "";
904 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
905 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
906 size_t new_len = strlen(new_value);
907 const char* value;
908 char* free_this_too = NULL;
909 if (old_len == 0) {
910 value = new_value;
911 } else if (new_len == 0) {
912 value = old_value;
913 } else {
914 size_t length = old_len + 1 + new_len + 1;
915 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
916 // each new setting adds another LINE to the switch:
917 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
918 value = buf;
919 free_this_too = buf;
920 }
921 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
922 // JVMFlag always returns a pointer that needs freeing.
923 FREE_C_HEAP_ARRAY(char, value);
924 // JVMFlag made its own copy, so I must delete my own temp. buffer.
925 FREE_C_HEAP_ARRAY(char, free_this_too);
926 return true;
927 }
928
929 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
930 const char* real_name = real_flag_name(arg);
931 JDK_Version since = JDK_Version();
932 switch (is_deprecated_flag(arg, &since)) {
933 case -1: {
934 // Obsolete or expired, so don't process normally,
935 // but allow for an obsolete flag we're still
936 // temporarily allowing.
937 if (!is_obsolete_flag(arg, &since)) {
938 return real_name;
939 }
940 // Note if we're not considered obsolete then we can't be expired either
941 // as obsoletion must come first.
942 return NULL;
943 }
944 case 0:
945 return real_name;
946 case 1: {
947 if (warn) {
948 char version[256];
949 since.to_string(version, sizeof(version));
950 if (real_name != arg) {
951 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
952 arg, version, real_name);
953 } else {
954 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
955 arg, version);
956 }
957 }
958 return real_name;
959 }
960 }
961 ShouldNotReachHere();
962 return NULL;
963 }
964
965 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
966
967 // range of acceptable characters spelled out for portability reasons
968 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
969 #define BUFLEN 255
970 char name[BUFLEN+1];
971 char dummy;
972 const char* real_name;
973 bool warn_if_deprecated = true;
974
975 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
976 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
977 if (real_name == NULL) {
978 return false;
979 }
980 JVMFlag* flag = JVMFlag::find_flag(real_name);
981 return set_bool_flag(flag, false, origin);
982 }
983 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
984 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
985 if (real_name == NULL) {
986 return false;
987 }
988 JVMFlag* flag = JVMFlag::find_flag(real_name);
989 return set_bool_flag(flag, true, origin);
990 }
991
992 char punct;
993 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
994 const char* value = strchr(arg, '=') + 1;
995
996 // this scanf pattern matches both strings (handled here) and numbers (handled later))
997 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
998 if (real_name == NULL) {
999 return false;
1000 }
1001 JVMFlag* flag = JVMFlag::find_flag(real_name);
1002 if (flag != NULL && flag->is_ccstr()) {
1003 if (flag->ccstr_accumulates()) {
1004 return append_to_string_flag(flag, value, origin);
1005 } else {
1006 if (value[0] == '\0') {
1007 value = NULL;
1008 }
1009 return set_string_flag(flag, value, origin);
1010 }
1011 } else {
1012 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1013 }
1014 }
1015
1016 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1017 const char* value = strchr(arg, '=') + 1;
1018 // -XX:Foo:=xxx will reset the string flag to the given value.
1019 if (value[0] == '\0') {
1020 value = NULL;
1021 }
1022 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1023 if (real_name == NULL) {
1024 return false;
1025 }
1026 JVMFlag* flag = JVMFlag::find_flag(real_name);
1027 return set_string_flag(flag, value, origin);
1028 }
1029
1030 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1031 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1032 #define NUMBER_RANGE "[0123456789eE+-]"
1033 char value[BUFLEN + 1];
1034 char value2[BUFLEN + 1];
1035 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1036 // Looks like a floating-point number -- try again with more lenient format string
1037 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1038 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1039 if (real_name == NULL) {
1040 return false;
1041 }
1042 JVMFlag* flag = JVMFlag::find_flag(real_name);
1043 return set_fp_numeric_flag(flag, value, origin);
1044 }
1045 }
1046
1047 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1048 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1049 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1050 if (real_name == NULL) {
1051 return false;
1052 }
1053 JVMFlag* flag = JVMFlag::find_flag(real_name);
1054 return set_numeric_flag(flag, value, origin);
1055 }
1056
1057 return false;
1058 }
1059
1060 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1061 assert(bldarray != NULL, "illegal argument");
1062
1063 if (arg == NULL) {
1064 return;
1065 }
1066
1067 int new_count = *count + 1;
1068
1069 // expand the array and add arg to the last element
1070 if (*bldarray == NULL) {
1071 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1072 } else {
1073 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1074 }
1075 (*bldarray)[*count] = os::strdup_check_oom(arg);
1076 *count = new_count;
1077 }
1078
1079 void Arguments::build_jvm_args(const char* arg) {
1080 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1081 }
1082
1083 void Arguments::build_jvm_flags(const char* arg) {
1084 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1085 }
1086
1087 // utility function to return a string that concatenates all
1088 // strings in a given char** array
1089 const char* Arguments::build_resource_string(char** args, int count) {
1090 if (args == NULL || count == 0) {
1091 return NULL;
1092 }
1093 size_t length = 0;
1094 for (int i = 0; i < count; i++) {
1095 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1096 }
1097 char* s = NEW_RESOURCE_ARRAY(char, length);
1098 char* dst = s;
1099 for (int j = 0; j < count; j++) {
1100 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1101 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1102 dst += offset;
1103 length -= offset;
1104 }
1105 return (const char*) s;
1106 }
1107
1108 void Arguments::print_on(outputStream* st) {
1109 st->print_cr("VM Arguments:");
1110 if (num_jvm_flags() > 0) {
1111 st->print("jvm_flags: "); print_jvm_flags_on(st);
1112 st->cr();
1113 }
1114 if (num_jvm_args() > 0) {
1115 st->print("jvm_args: "); print_jvm_args_on(st);
1116 st->cr();
1117 }
1118 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1119 if (_java_class_path != NULL) {
1120 char* path = _java_class_path->value();
1121 size_t len = strlen(path);
1122 st->print("java_class_path (initial): ");
1123 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1124 if (len == 0) {
1125 st->print_raw_cr("<not set>");
1126 } else {
1127 st->print_raw_cr(path, len);
1128 }
1129 }
1130 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1131 }
1132
1133 void Arguments::print_summary_on(outputStream* st) {
1134 // Print the command line. Environment variables that are helpful for
1135 // reproducing the problem are written later in the hs_err file.
1136 // flags are from setting file
1137 if (num_jvm_flags() > 0) {
1138 st->print_raw("Settings File: ");
1139 print_jvm_flags_on(st);
1140 st->cr();
1141 }
1142 // args are the command line and environment variable arguments.
1143 st->print_raw("Command Line: ");
1144 if (num_jvm_args() > 0) {
1145 print_jvm_args_on(st);
1146 }
1147 // this is the classfile and any arguments to the java program
1148 if (java_command() != NULL) {
1149 st->print("%s", java_command());
1150 }
1151 st->cr();
1152 }
1153
1154 void Arguments::print_jvm_flags_on(outputStream* st) {
1155 if (_num_jvm_flags > 0) {
1156 for (int i=0; i < _num_jvm_flags; i++) {
1157 st->print("%s ", _jvm_flags_array[i]);
1158 }
1159 }
1160 }
1161
1162 void Arguments::print_jvm_args_on(outputStream* st) {
1163 if (_num_jvm_args > 0) {
1164 for (int i=0; i < _num_jvm_args; i++) {
1165 st->print("%s ", _jvm_args_array[i]);
1166 }
1167 }
1168 }
1169
1170 bool Arguments::process_argument(const char* arg,
1171 jboolean ignore_unrecognized,
1172 JVMFlagOrigin origin) {
1173 JDK_Version since = JDK_Version();
1174
1175 if (parse_argument(arg, origin)) {
1176 return true;
1177 }
1178
1179 // Determine if the flag has '+', '-', or '=' characters.
1180 bool has_plus_minus = (*arg == '+' || *arg == '-');
1181 const char* const argname = has_plus_minus ? arg + 1 : arg;
1182
1183 size_t arg_len;
1184 const char* equal_sign = strchr(argname, '=');
1185 if (equal_sign == NULL) {
1186 arg_len = strlen(argname);
1187 } else {
1188 arg_len = equal_sign - argname;
1189 }
1190
1191 // Only make the obsolete check for valid arguments.
1192 if (arg_len <= BUFLEN) {
1193 // Construct a string which consists only of the argument name without '+', '-', or '='.
1194 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1195 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1196 if (is_obsolete_flag(stripped_argname, &since)) {
1197 char version[256];
1198 since.to_string(version, sizeof(version));
1199 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1200 return true;
1201 }
1202 }
1203
1204 // For locked flags, report a custom error message if available.
1205 // Otherwise, report the standard unrecognized VM option.
1206 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1207 if (found_flag != NULL) {
1208 char locked_message_buf[BUFLEN];
1209 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1210 if (strlen(locked_message_buf) == 0) {
1211 if (found_flag->is_bool() && !has_plus_minus) {
1212 jio_fprintf(defaultStream::error_stream(),
1213 "Missing +/- setting for VM option '%s'\n", argname);
1214 } else if (!found_flag->is_bool() && has_plus_minus) {
1215 jio_fprintf(defaultStream::error_stream(),
1216 "Unexpected +/- setting in VM option '%s'\n", argname);
1217 } else {
1218 jio_fprintf(defaultStream::error_stream(),
1219 "Improperly specified VM option '%s'\n", argname);
1220 }
1221 } else {
1222 #ifdef PRODUCT
1223 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1224 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1225 if (ignore_unrecognized && mismatched) {
1226 return true;
1227 }
1228 #endif
1229 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1230 }
1231 } else {
1232 if (ignore_unrecognized) {
1233 return true;
1234 }
1235 jio_fprintf(defaultStream::error_stream(),
1236 "Unrecognized VM option '%s'\n", argname);
1237 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1238 if (fuzzy_matched != NULL) {
1239 jio_fprintf(defaultStream::error_stream(),
1240 "Did you mean '%s%s%s'? ",
1241 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1242 fuzzy_matched->name(),
1243 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1244 }
1245 }
1246
1247 // allow for commandline "commenting out" options like -XX:#+Verbose
1248 return arg[0] == '#';
1249 }
1250
1251 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1252 FILE* stream = fopen(file_name, "rb");
1253 if (stream == NULL) {
1254 if (should_exist) {
1255 jio_fprintf(defaultStream::error_stream(),
1256 "Could not open settings file %s\n", file_name);
1257 return false;
1258 } else {
1259 return true;
1260 }
1261 }
1262
1263 char token[1024];
1264 int pos = 0;
1265
1266 bool in_white_space = true;
1267 bool in_comment = false;
1268 bool in_quote = false;
1269 char quote_c = 0;
1270 bool result = true;
1271
1272 int c = getc(stream);
1273 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1274 if (in_white_space) {
1275 if (in_comment) {
1276 if (c == '\n') in_comment = false;
1277 } else {
1278 if (c == '#') in_comment = true;
1279 else if (!isspace(c)) {
1280 in_white_space = false;
1281 token[pos++] = c;
1282 }
1283 }
1284 } else {
1285 if (c == '\n' || (!in_quote && isspace(c))) {
1286 // token ends at newline, or at unquoted whitespace
1287 // this allows a way to include spaces in string-valued options
1288 token[pos] = '\0';
1289 logOption(token);
1290 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1291 build_jvm_flags(token);
1292 pos = 0;
1293 in_white_space = true;
1294 in_quote = false;
1295 } else if (!in_quote && (c == '\'' || c == '"')) {
1296 in_quote = true;
1297 quote_c = c;
1298 } else if (in_quote && (c == quote_c)) {
1299 in_quote = false;
1300 } else {
1301 token[pos++] = c;
1302 }
1303 }
1304 c = getc(stream);
1305 }
1306 if (pos > 0) {
1307 token[pos] = '\0';
1308 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1309 build_jvm_flags(token);
1310 }
1311 fclose(stream);
1312 return result;
1313 }
1314
1315 //=============================================================================================================
1316 // Parsing of properties (-D)
1317
1318 const char* Arguments::get_property(const char* key) {
1319 return PropertyList_get_value(system_properties(), key);
1320 }
1321
1322 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1323 const char* eq = strchr(prop, '=');
1324 const char* key;
1325 const char* value = "";
1326
1327 if (eq == NULL) {
1328 // property doesn't have a value, thus use passed string
1329 key = prop;
1330 } else {
1331 // property have a value, thus extract it and save to the
1332 // allocated string
1333 size_t key_len = eq - prop;
1334 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1335
1336 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1337 key = tmp_key;
1338
1339 value = &prop[key_len + 1];
1340 }
1341
1342 #if INCLUDE_CDS
1343 if (is_internal_module_property(key) ||
1344 strcmp(key, "jdk.module.main") == 0) {
1345 MetaspaceShared::disable_optimized_module_handling();
1346 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1347 }
1348 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1349 strcmp(key, "jdk.module.validation") == 0 ||
1350 strcmp(key, "java.system.class.loader") == 0) {
1351 MetaspaceShared::disable_full_module_graph();
1352 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1353 }
1354 #endif
1355
1356 if (strcmp(key, "java.compiler") == 0) {
1357 process_java_compiler_argument(value);
1358 // Record value in Arguments, but let it get passed to Java.
1359 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1360 // sun.java.launcher.is_altjvm property is
1361 // private and is processed in process_sun_java_launcher_properties();
1362 // the sun.java.launcher property is passed on to the java application
1363 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1364 // append is true, writable is true, internal is false
1365 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1366 WriteableProperty, ExternalProperty);
1367 } else {
1368 if (strcmp(key, "sun.java.command") == 0) {
1369 char *old_java_command = _java_command;
1370 _java_command = os::strdup_check_oom(value, mtArguments);
1371 if (old_java_command != NULL) {
1372 os::free(old_java_command);
1373 }
1374 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1375 // If this property is set on the command line then its value will be
1376 // displayed in VM error logs as the URL at which to submit such logs.
1377 // Normally the URL displayed in error logs is different from the value
1378 // of this system property, so a different property should have been
1379 // used here, but we leave this as-is in case someone depends upon it.
1380 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1381 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1382 // its value without going through the property list or making a Java call.
1383 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1384 if (old_java_vendor_url_bug != NULL) {
1385 os::free((void *)old_java_vendor_url_bug);
1386 }
1387 }
1388
1389 // Create new property and add at the end of the list
1390 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1391 }
1392
1393 if (key != prop) {
1394 // SystemProperty copy passed value, thus free previously allocated
1395 // memory
1396 FreeHeap((void *)key);
1397 }
1398
1399 return true;
1400 }
1401
1402 #if INCLUDE_CDS
1403 const char* unsupported_properties[] = { "jdk.module.limitmods",
1404 "jdk.module.upgrade.path",
1405 "jdk.module.patch.0" };
1406 const char* unsupported_options[] = { "--limit-modules",
1407 "--upgrade-module-path",
1408 "--patch-module"
1409 };
1410 void Arguments::check_unsupported_dumping_properties() {
1411 assert(is_dumping_archive(),
1412 "this function is only used with CDS dump time");
1413 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1414 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1415 SystemProperty* sp = system_properties();
1416 while (sp != NULL) {
1417 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1418 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1419 vm_exit_during_initialization(
1420 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1421 }
1422 }
1423 sp = sp->next();
1424 }
1425
1426 // Check for an exploded module build in use with -Xshare:dump.
1427 if (!has_jimage()) {
1428 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1429 }
1430 }
1431
1432 bool Arguments::check_unsupported_cds_runtime_properties() {
1433 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1434 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1435 if (ArchiveClassesAtExit != NULL) {
1436 // dynamic dumping, just return false for now.
1437 // check_unsupported_dumping_properties() will be called later to check the same set of
1438 // properties, and will exit the VM with the correct error message if the unsupported properties
1439 // are used.
1440 return false;
1441 }
1442 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1443 if (get_property(unsupported_properties[i]) != NULL) {
1444 if (RequireSharedSpaces) {
1445 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1446 } else {
1447 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1448 }
1449 return true;
1450 }
1451 }
1452 return false;
1453 }
1454 #endif
1455
1456 //===========================================================================================================
1457 // Setting int/mixed/comp mode flags
1458
1459 void Arguments::set_mode_flags(Mode mode) {
1460 // Set up default values for all flags.
1461 // If you add a flag to any of the branches below,
1462 // add a default value for it here.
1463 set_java_compiler(false);
1464 _mode = mode;
1465
1466 // Ensure Agent_OnLoad has the correct initial values.
1467 // This may not be the final mode; mode may change later in onload phase.
1468 PropertyList_unique_add(&_system_properties, "java.vm.info",
1469 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1470
1471 UseInterpreter = true;
1472 UseCompiler = true;
1473 UseLoopCounter = true;
1474
1475 // Default values may be platform/compiler dependent -
1476 // use the saved values
1477 ClipInlining = Arguments::_ClipInlining;
1478 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1479 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1480 BackgroundCompilation = Arguments::_BackgroundCompilation;
1481
1482 // Change from defaults based on mode
1483 switch (mode) {
1484 default:
1485 ShouldNotReachHere();
1486 break;
1487 case _int:
1488 UseCompiler = false;
1489 UseLoopCounter = false;
1490 AlwaysCompileLoopMethods = false;
1491 UseOnStackReplacement = false;
1492 break;
1493 case _mixed:
1494 // same as default
1495 break;
1496 case _comp:
1497 UseInterpreter = false;
1498 BackgroundCompilation = false;
1499 ClipInlining = false;
1500 break;
1501 }
1502 }
1503
1504 // Conflict: required to use shared spaces (-Xshare:on), but
1505 // incompatible command line options were chosen.
1506 static void no_shared_spaces(const char* message) {
1507 if (RequireSharedSpaces) {
1508 jio_fprintf(defaultStream::error_stream(),
1509 "Class data sharing is inconsistent with other specified options.\n");
1510 vm_exit_during_initialization("Unable to use shared archive", message);
1511 } else {
1512 log_info(cds)("Unable to use shared archive: %s", message);
1513 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1514 }
1515 }
1516
1517 void set_object_alignment() {
1518 // Object alignment.
1519 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1520 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1521 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1522 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1523 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1524 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1525
1526 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1527 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1528
1529 // Oop encoding heap max
1530 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1531 }
1532
1533 size_t Arguments::max_heap_for_compressed_oops() {
1534 // Avoid sign flip.
1535 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1536 // We need to fit both the NULL page and the heap into the memory budget, while
1537 // keeping alignment constraints of the heap. To guarantee the latter, as the
1538 // NULL page is located before the heap, we pad the NULL page to the conservative
1539 // maximum alignment that the GC may ever impose upon the heap.
1540 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1541 _conservative_max_heap_alignment);
1542
1543 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1544 NOT_LP64(ShouldNotReachHere(); return 0);
1545 }
1546
1547 void Arguments::set_use_compressed_oops() {
1548 #ifdef _LP64
1549 // MaxHeapSize is not set up properly at this point, but
1550 // the only value that can override MaxHeapSize if we are
1551 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1552 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1553
1554 if (max_heap_size <= max_heap_for_compressed_oops()) {
1555 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1556 FLAG_SET_ERGO(UseCompressedOops, true);
1557 }
1558 } else {
1559 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1560 warning("Max heap size too large for Compressed Oops");
1561 FLAG_SET_DEFAULT(UseCompressedOops, false);
1562 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1563 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1564 }
1565 }
1566 }
1567 #endif // _LP64
1568 }
1569
1570
1571 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1572 // set_use_compressed_oops().
1573 void Arguments::set_use_compressed_klass_ptrs() {
1574 #ifdef _LP64
1575 // On some architectures, the use of UseCompressedClassPointers implies the use of
1576 // UseCompressedOops. The reason is that the rheap_base register of said platforms
1577 // is reused to perform some optimized spilling, in order to use rheap_base as a
1578 // temp register. But by treating it as any other temp register, spilling can typically
1579 // be completely avoided instead. So it is better not to perform this trick. And by
1580 // not having that reliance, large heaps, or heaps not supporting compressed oops,
1581 // can still use compressed class pointers.
1582 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
1583 if (UseCompressedClassPointers) {
1584 warning("UseCompressedClassPointers requires UseCompressedOops");
1585 }
1586 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1587 } else {
1588 // Turn on UseCompressedClassPointers too
1589 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1590 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1591 }
1592 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1593 if (UseCompressedClassPointers) {
1594 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1595 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1596 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1597 }
1598 }
1599 }
1600 #endif // _LP64
1601 }
1602
1603 void Arguments::set_conservative_max_heap_alignment() {
1604 // The conservative maximum required alignment for the heap is the maximum of
1605 // the alignments imposed by several sources: any requirements from the heap
1606 // itself and the maximum page size we may run the VM with.
1607 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1608 _conservative_max_heap_alignment = MAX4(heap_alignment,
1609 (size_t)os::vm_allocation_granularity(),
1610 os::max_page_size(),
1611 GCArguments::compute_heap_alignment());
1612 }
1613
1614 jint Arguments::set_ergonomics_flags() {
1615 GCConfig::initialize();
1616
1617 set_conservative_max_heap_alignment();
1618
1619 #ifdef _LP64
1620 set_use_compressed_oops();
1621
1622 // set_use_compressed_klass_ptrs() must be called after calling
1623 // set_use_compressed_oops().
1624 set_use_compressed_klass_ptrs();
1625
1626 // Also checks that certain machines are slower with compressed oops
1627 // in vm_version initialization code.
1628 #endif // _LP64
1629
1630 return JNI_OK;
1631 }
1632
1633 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1634 size_t max_allocatable;
1635 size_t result = limit;
1636 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1637 // The AggressiveHeap check is a temporary workaround to avoid calling
1638 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1639 // selected. This works because AggressiveHeap implies UseParallelGC
1640 // where we know the ratio will be 1. Once the AggressiveHeap option is
1641 // removed, this can be cleaned up.
1642 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1643 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1644 result = MIN2(result, max_allocatable / fraction);
1645 }
1646 return result;
1647 }
1648
1649 // Use static initialization to get the default before parsing
1650 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1651
1652 void Arguments::set_heap_size() {
1653 julong phys_mem;
1654
1655 // If the user specified one of these options, they
1656 // want specific memory sizing so do not limit memory
1657 // based on compressed oops addressability.
1658 // Also, memory limits will be calculated based on
1659 // available os physical memory, not our MaxRAM limit,
1660 // unless MaxRAM is also specified.
1661 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1662 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1663 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1664 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1665 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1666 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1667 !FLAG_IS_DEFAULT(MaxRAM));
1668 if (override_coop_limit) {
1669 if (FLAG_IS_DEFAULT(MaxRAM)) {
1670 phys_mem = os::physical_memory();
1671 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1672 } else {
1673 phys_mem = (julong)MaxRAM;
1674 }
1675 } else {
1676 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1677 : (julong)MaxRAM;
1678 }
1679
1680
1681 // Convert deprecated flags
1682 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1683 !FLAG_IS_DEFAULT(MaxRAMFraction))
1684 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1685
1686 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1687 !FLAG_IS_DEFAULT(MinRAMFraction))
1688 MinRAMPercentage = 100.0 / MinRAMFraction;
1689
1690 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1691 !FLAG_IS_DEFAULT(InitialRAMFraction))
1692 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1693
1694 // If the maximum heap size has not been set with -Xmx,
1695 // then set it as fraction of the size of physical memory,
1696 // respecting the maximum and minimum sizes of the heap.
1697 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1698 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1699 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1700 if (reasonable_min < MaxHeapSize) {
1701 // Small physical memory, so use a minimum fraction of it for the heap
1702 reasonable_max = reasonable_min;
1703 } else {
1704 // Not-small physical memory, so require a heap at least
1705 // as large as MaxHeapSize
1706 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1707 }
1708
1709 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1710 // Limit the heap size to ErgoHeapSizeLimit
1711 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1712 }
1713
1714 #ifdef _LP64
1715 if (UseCompressedOops || UseCompressedClassPointers) {
1716 // HeapBaseMinAddress can be greater than default but not less than.
1717 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1718 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1719 // matches compressed oops printing flags
1720 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1721 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1722 DefaultHeapBaseMinAddress,
1723 DefaultHeapBaseMinAddress/G,
1724 HeapBaseMinAddress);
1725 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1726 }
1727 }
1728 }
1729 if (UseCompressedOops) {
1730 // Limit the heap size to the maximum possible when using compressed oops
1731 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1732
1733 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1734 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1735 // but it should be not less than default MaxHeapSize.
1736 max_coop_heap -= HeapBaseMinAddress;
1737 }
1738
1739 // If user specified flags prioritizing os physical
1740 // memory limits, then disable compressed oops if
1741 // limits exceed max_coop_heap and UseCompressedOops
1742 // was not specified.
1743 if (reasonable_max > max_coop_heap) {
1744 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1745 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1746 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1747 "Please check the setting of MaxRAMPercentage %5.2f."
1748 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1749 FLAG_SET_ERGO(UseCompressedOops, false);
1750 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1751 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1752 }
1753 } else {
1754 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1755 }
1756 }
1757 }
1758 #endif // _LP64
1759
1760 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1761
1762 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1763 // An initial heap size was specified on the command line,
1764 // so be sure that the maximum size is consistent. Done
1765 // after call to limit_heap_by_allocatable_memory because that
1766 // method might reduce the allocation size.
1767 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1768 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1769 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1770 }
1771
1772 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1773 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1774 }
1775
1776 // If the minimum or initial heap_size have not been set or requested to be set
1777 // ergonomically, set them accordingly.
1778 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1779 julong reasonable_minimum = (julong)(OldSize + NewSize);
1780
1781 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1782
1783 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1784
1785 if (InitialHeapSize == 0) {
1786 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1787 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1788
1789 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1790 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1791
1792 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1793 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1794 }
1795 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1796 // synchronize with InitialHeapSize to avoid errors with the default value.
1797 if (MinHeapSize == 0) {
1798 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1799 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1800 }
1801 }
1802 }
1803
1804 // This option inspects the machine and attempts to set various
1805 // parameters to be optimal for long-running, memory allocation
1806 // intensive jobs. It is intended for machines with large
1807 // amounts of cpu and memory.
1808 jint Arguments::set_aggressive_heap_flags() {
1809 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1810 // VM, but we may not be able to represent the total physical memory
1811 // available (like having 8gb of memory on a box but using a 32bit VM).
1812 // Thus, we need to make sure we're using a julong for intermediate
1813 // calculations.
1814 julong initHeapSize;
1815 julong total_memory = os::physical_memory();
1816
1817 if (total_memory < (julong) 256 * M) {
1818 jio_fprintf(defaultStream::error_stream(),
1819 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1820 vm_exit(1);
1821 }
1822
1823 // The heap size is half of available memory, or (at most)
1824 // all of possible memory less 160mb (leaving room for the OS
1825 // when using ISM). This is the maximum; because adaptive sizing
1826 // is turned on below, the actual space used may be smaller.
1827
1828 initHeapSize = MIN2(total_memory / (julong) 2,
1829 total_memory - (julong) 160 * M);
1830
1831 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1832
1833 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1834 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1835 return JNI_EINVAL;
1836 }
1837 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1838 return JNI_EINVAL;
1839 }
1840 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1841 return JNI_EINVAL;
1842 }
1843 }
1844 if (FLAG_IS_DEFAULT(NewSize)) {
1845 // Make the young generation 3/8ths of the total heap.
1846 if (FLAG_SET_CMDLINE(NewSize,
1847 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1848 return JNI_EINVAL;
1849 }
1850 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1851 return JNI_EINVAL;
1852 }
1853 }
1854
1855 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1856 FLAG_SET_DEFAULT(UseLargePages, true);
1857 #endif
1858
1859 // Increase some data structure sizes for efficiency
1860 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1861 return JNI_EINVAL;
1862 }
1863 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1864 return JNI_EINVAL;
1865 }
1866 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1867 return JNI_EINVAL;
1868 }
1869
1870 // See the OldPLABSize comment below, but replace 'after promotion'
1871 // with 'after copying'. YoungPLABSize is the size of the survivor
1872 // space per-gc-thread buffers. The default is 4kw.
1873 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1874 return JNI_EINVAL;
1875 }
1876
1877 // OldPLABSize is the size of the buffers in the old gen that
1878 // UseParallelGC uses to promote live data that doesn't fit in the
1879 // survivor spaces. At any given time, there's one for each gc thread.
1880 // The default size is 1kw. These buffers are rarely used, since the
1881 // survivor spaces are usually big enough. For specjbb, however, there
1882 // are occasions when there's lots of live data in the young gen
1883 // and we end up promoting some of it. We don't have a definite
1884 // explanation for why bumping OldPLABSize helps, but the theory
1885 // is that a bigger PLAB results in retaining something like the
1886 // original allocation order after promotion, which improves mutator
1887 // locality. A minor effect may be that larger PLABs reduce the
1888 // number of PLAB allocation events during gc. The value of 8kw
1889 // was arrived at by experimenting with specjbb.
1890 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1891 return JNI_EINVAL;
1892 }
1893
1894 // Enable parallel GC and adaptive generation sizing
1895 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1896 return JNI_EINVAL;
1897 }
1898
1899 // Encourage steady state memory management
1900 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1901 return JNI_EINVAL;
1902 }
1903
1904 // This appears to improve mutator locality
1905 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1906 return JNI_EINVAL;
1907 }
1908
1909 return JNI_OK;
1910 }
1911
1912 // This must be called after ergonomics.
1913 void Arguments::set_bytecode_flags() {
1914 if (!RewriteBytecodes) {
1915 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1916 }
1917 }
1918
1919 // Aggressive optimization flags
1920 jint Arguments::set_aggressive_opts_flags() {
1921 #ifdef COMPILER2
1922 if (AggressiveUnboxing) {
1923 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1924 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1925 } else if (!EliminateAutoBox) {
1926 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1927 AggressiveUnboxing = false;
1928 }
1929 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1930 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1931 } else if (!DoEscapeAnalysis) {
1932 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1933 AggressiveUnboxing = false;
1934 }
1935 }
1936 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1937 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1938 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1939 }
1940 // Feed the cache size setting into the JDK
1941 char buffer[1024];
1942 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1943 if (!add_property(buffer)) {
1944 return JNI_ENOMEM;
1945 }
1946 }
1947 #endif
1948
1949 return JNI_OK;
1950 }
1951
1952 //===========================================================================================================
1953 // Parsing of java.compiler property
1954
1955 void Arguments::process_java_compiler_argument(const char* arg) {
1956 // For backwards compatibility, Djava.compiler=NONE or ""
1957 // causes us to switch to -Xint mode UNLESS -Xdebug
1958 // is also specified.
1959 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1960 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1961 }
1962 }
1963
1964 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1965 _sun_java_launcher = os::strdup_check_oom(launcher);
1966 }
1967
1968 bool Arguments::created_by_java_launcher() {
1969 assert(_sun_java_launcher != NULL, "property must have value");
1970 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1971 }
1972
1973 bool Arguments::sun_java_launcher_is_altjvm() {
1974 return _sun_java_launcher_is_altjvm;
1975 }
1976
1977 //===========================================================================================================
1978 // Parsing of main arguments
1979
1980 unsigned int addreads_count = 0;
1981 unsigned int addexports_count = 0;
1982 unsigned int addopens_count = 0;
1983 unsigned int addmods_count = 0;
1984 unsigned int patch_mod_count = 0;
1985 unsigned int enable_native_access_count = 0;
1986
1987 // Check the consistency of vm_init_args
1988 bool Arguments::check_vm_args_consistency() {
1989 // Method for adding checks for flag consistency.
1990 // The intent is to warn the user of all possible conflicts,
1991 // before returning an error.
1992 // Note: Needs platform-dependent factoring.
1993 bool status = true;
1994
1995 if (TLABRefillWasteFraction == 0) {
1996 jio_fprintf(defaultStream::error_stream(),
1997 "TLABRefillWasteFraction should be a denominator, "
1998 "not " SIZE_FORMAT "\n",
1999 TLABRefillWasteFraction);
2000 status = false;
2001 }
2002
2003 status = CompilerConfig::check_args_consistency(status);
2004 #if INCLUDE_JVMCI
2005 if (status && EnableJVMCI) {
2006 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2007 AddProperty, UnwriteableProperty, InternalProperty);
2008 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2009 return false;
2010 }
2011 }
2012 #endif
2013
2014 #ifndef SUPPORT_RESERVED_STACK_AREA
2015 if (StackReservedPages != 0) {
2016 FLAG_SET_CMDLINE(StackReservedPages, 0);
2017 warning("Reserved Stack Area not supported on this platform");
2018 }
2019 #endif
2020
2021 return status;
2022 }
2023
2024 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2025 const char* option_type) {
2026 if (ignore) return false;
2027
2028 const char* spacer = " ";
2029 if (option_type == NULL) {
2030 option_type = ++spacer; // Set both to the empty string.
2031 }
2032
2033 jio_fprintf(defaultStream::error_stream(),
2034 "Unrecognized %s%soption: %s\n", option_type, spacer,
2035 option->optionString);
2036 return true;
2037 }
2038
2039 static const char* user_assertion_options[] = {
2040 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2041 };
2042
2043 static const char* system_assertion_options[] = {
2044 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2045 };
2046
2047 bool Arguments::parse_uintx(const char* value,
2048 uintx* uintx_arg,
2049 uintx min_size) {
2050
2051 // Check the sign first since atojulong() parses only unsigned values.
2052 bool value_is_positive = !(*value == '-');
2053
2054 if (value_is_positive) {
2055 julong n;
2056 bool good_return = atojulong(value, &n);
2057 if (good_return) {
2058 bool above_minimum = n >= min_size;
2059 bool value_is_too_large = n > max_uintx;
2060
2061 if (above_minimum && !value_is_too_large) {
2062 *uintx_arg = n;
2063 return true;
2064 }
2065 }
2066 }
2067 return false;
2068 }
2069
2070 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2071 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
2072 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2073 char* property = AllocateHeap(prop_len, mtArguments);
2074 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2075 if (ret < 0 || ret >= (int)prop_len) {
2076 FreeHeap(property);
2077 return false;
2078 }
2079 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2080 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2081 // that multiple occurrences of the associated flag just causes the existing property value to be
2082 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2083 // to a property after we have finished flag processing.
2084 bool added = add_property(property, WriteableProperty, internal);
2085 FreeHeap(property);
2086 return added;
2087 }
2088
2089 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2090 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2091 const unsigned int props_count_limit = 1000;
2092 const int max_digits = 3;
2093 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2094
2095 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2096 if (count < props_count_limit) {
2097 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2098 char* property = AllocateHeap(prop_len, mtArguments);
2099 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2100 if (ret < 0 || ret >= (int)prop_len) {
2101 FreeHeap(property);
2102 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2103 return false;
2104 }
2105 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2106 FreeHeap(property);
2107 return added;
2108 }
2109
2110 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2111 return false;
2112 }
2113
2114 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2115 julong* long_arg,
2116 julong min_size,
2117 julong max_size) {
2118 if (!atojulong(s, long_arg)) return arg_unreadable;
2119 return check_memory_size(*long_arg, min_size, max_size);
2120 }
2121
2122 // Parse JavaVMInitArgs structure
2123
2124 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2125 const JavaVMInitArgs *java_tool_options_args,
2126 const JavaVMInitArgs *java_options_args,
2127 const JavaVMInitArgs *cmd_line_args) {
2128 bool patch_mod_javabase = false;
2129
2130 // Save default settings for some mode flags
2131 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2132 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2133 Arguments::_ClipInlining = ClipInlining;
2134 Arguments::_BackgroundCompilation = BackgroundCompilation;
2135
2136 // Remember the default value of SharedBaseAddress.
2137 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2138
2139 // Setup flags for mixed which is the default
2140 set_mode_flags(_mixed);
2141
2142 // Parse args structure generated from java.base vm options resource
2143 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2144 if (result != JNI_OK) {
2145 return result;
2146 }
2147
2148 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2149 // variable (if present).
2150 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2151 if (result != JNI_OK) {
2152 return result;
2153 }
2154
2155 // Parse args structure generated from the command line flags.
2156 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2157 if (result != JNI_OK) {
2158 return result;
2159 }
2160
2161 // Parse args structure generated from the _JAVA_OPTIONS environment
2162 // variable (if present) (mimics classic VM)
2163 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2164 if (result != JNI_OK) {
2165 return result;
2166 }
2167
2168 // We need to ensure processor and memory resources have been properly
2169 // configured - which may rely on arguments we just processed - before
2170 // doing the final argument processing. Any argument processing that
2171 // needs to know about processor and memory resources must occur after
2172 // this point.
2173
2174 os::init_container_support();
2175
2176 // Do final processing now that all arguments have been parsed
2177 result = finalize_vm_init_args(patch_mod_javabase);
2178 if (result != JNI_OK) {
2179 return result;
2180 }
2181
2182 return JNI_OK;
2183 }
2184
2185 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2186 // represents a valid JDWP agent. is_path==true denotes that we
2187 // are dealing with -agentpath (case where name is a path), otherwise with
2188 // -agentlib
2189 bool valid_jdwp_agent(char *name, bool is_path) {
2190 char *_name;
2191 const char *_jdwp = "jdwp";
2192 size_t _len_jdwp, _len_prefix;
2193
2194 if (is_path) {
2195 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2196 return false;
2197 }
2198
2199 _name++; // skip past last path separator
2200 _len_prefix = strlen(JNI_LIB_PREFIX);
2201
2202 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2203 return false;
2204 }
2205
2206 _name += _len_prefix;
2207 _len_jdwp = strlen(_jdwp);
2208
2209 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2210 _name += _len_jdwp;
2211 }
2212 else {
2213 return false;
2214 }
2215
2216 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2217 return false;
2218 }
2219
2220 return true;
2221 }
2222
2223 if (strcmp(name, _jdwp) == 0) {
2224 return true;
2225 }
2226
2227 return false;
2228 }
2229
2230 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2231 // --patch-module=<module>=<file>(<pathsep><file>)*
2232 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2233 // Find the equal sign between the module name and the path specification
2234 const char* module_equal = strchr(patch_mod_tail, '=');
2235 if (module_equal == NULL) {
2236 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2237 return JNI_ERR;
2238 } else {
2239 // Pick out the module name
2240 size_t module_len = module_equal - patch_mod_tail;
2241 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2242 if (module_name != NULL) {
2243 memcpy(module_name, patch_mod_tail, module_len);
2244 *(module_name + module_len) = '\0';
2245 // The path piece begins one past the module_equal sign
2246 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2247 FREE_C_HEAP_ARRAY(char, module_name);
2248 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2249 return JNI_ENOMEM;
2250 }
2251 } else {
2252 return JNI_ENOMEM;
2253 }
2254 }
2255 return JNI_OK;
2256 }
2257
2258 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2259 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2260 // The min and max sizes match the values in globals.hpp, but scaled
2261 // with K. The values have been chosen so that alignment with page
2262 // size doesn't change the max value, which makes the conversions
2263 // back and forth between Xss value and ThreadStackSize value easier.
2264 // The values have also been chosen to fit inside a 32-bit signed type.
2265 const julong min_ThreadStackSize = 0;
2266 const julong max_ThreadStackSize = 1 * M;
2267
2268 // Make sure the above values match the range set in globals.hpp
2269 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2270 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2271 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2272
2273 const julong min_size = min_ThreadStackSize * K;
2274 const julong max_size = max_ThreadStackSize * K;
2275
2276 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2277
2278 julong size = 0;
2279 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2280 if (errcode != arg_in_range) {
2281 bool silent = (option == NULL); // Allow testing to silence error messages
2282 if (!silent) {
2283 jio_fprintf(defaultStream::error_stream(),
2284 "Invalid thread stack size: %s\n", option->optionString);
2285 describe_range_error(errcode);
2286 }
2287 return JNI_EINVAL;
2288 }
2289
2290 // Internally track ThreadStackSize in units of 1024 bytes.
2291 const julong size_aligned = align_up(size, K);
2292 assert(size <= size_aligned,
2293 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2294 size, size_aligned);
2295
2296 const julong size_in_K = size_aligned / K;
2297 assert(size_in_K < (julong)max_intx,
2298 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2299 size_in_K);
2300
2301 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2302 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2303 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2304 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2305 max_expanded, size_in_K);
2306
2307 *out_ThreadStackSize = (intx)size_in_K;
2308
2309 return JNI_OK;
2310 }
2311
2312 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2313 // For match_option to return remaining or value part of option string
2314 const char* tail;
2315
2316 // iterate over arguments
2317 for (int index = 0; index < args->nOptions; index++) {
2318 bool is_absolute_path = false; // for -agentpath vs -agentlib
2319
2320 const JavaVMOption* option = args->options + index;
2321
2322 if (!match_option(option, "-Djava.class.path", &tail) &&
2323 !match_option(option, "-Dsun.java.command", &tail) &&
2324 !match_option(option, "-Dsun.java.launcher", &tail)) {
2325
2326 // add all jvm options to the jvm_args string. This string
2327 // is used later to set the java.vm.args PerfData string constant.
2328 // the -Djava.class.path and the -Dsun.java.command options are
2329 // omitted from jvm_args string as each have their own PerfData
2330 // string constant object.
2331 build_jvm_args(option->optionString);
2332 }
2333
2334 // -verbose:[class/module/gc/jni]
2335 if (match_option(option, "-verbose", &tail)) {
2336 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2337 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2338 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2339 } else if (!strcmp(tail, ":module")) {
2340 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2341 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2342 } else if (!strcmp(tail, ":gc")) {
2343 if (_legacyGCLogging.lastFlag == 0) {
2344 _legacyGCLogging.lastFlag = 1;
2345 }
2346 } else if (!strcmp(tail, ":jni")) {
2347 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2348 }
2349 // -da / -ea / -disableassertions / -enableassertions
2350 // These accept an optional class/package name separated by a colon, e.g.,
2351 // -da:java.lang.Thread.
2352 } else if (match_option(option, user_assertion_options, &tail, true)) {
2353 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2354 if (*tail == '\0') {
2355 JavaAssertions::setUserClassDefault(enable);
2356 } else {
2357 assert(*tail == ':', "bogus match by match_option()");
2358 JavaAssertions::addOption(tail + 1, enable);
2359 }
2360 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2361 } else if (match_option(option, system_assertion_options, &tail, false)) {
2362 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2363 JavaAssertions::setSystemClassDefault(enable);
2364 // -bootclasspath:
2365 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2366 jio_fprintf(defaultStream::output_stream(),
2367 "-Xbootclasspath is no longer a supported option.\n");
2368 return JNI_EINVAL;
2369 // -bootclasspath/a:
2370 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2371 Arguments::append_sysclasspath(tail);
2372 #if INCLUDE_CDS
2373 MetaspaceShared::disable_optimized_module_handling();
2374 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2375 #endif
2376 // -bootclasspath/p:
2377 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2378 jio_fprintf(defaultStream::output_stream(),
2379 "-Xbootclasspath/p is no longer a supported option.\n");
2380 return JNI_EINVAL;
2381 // -Xrun
2382 } else if (match_option(option, "-Xrun", &tail)) {
2383 if (tail != NULL) {
2384 const char* pos = strchr(tail, ':');
2385 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2386 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2387 jio_snprintf(name, len + 1, "%s", tail);
2388
2389 char *options = NULL;
2390 if(pos != NULL) {
2391 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2392 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2393 }
2394 #if !INCLUDE_JVMTI
2395 if (strcmp(name, "jdwp") == 0) {
2396 jio_fprintf(defaultStream::error_stream(),
2397 "Debugging agents are not supported in this VM\n");
2398 return JNI_ERR;
2399 }
2400 #endif // !INCLUDE_JVMTI
2401 add_init_library(name, options);
2402 }
2403 } else if (match_option(option, "--add-reads=", &tail)) {
2404 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2405 return JNI_ENOMEM;
2406 }
2407 } else if (match_option(option, "--add-exports=", &tail)) {
2408 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2409 return JNI_ENOMEM;
2410 }
2411 } else if (match_option(option, "--add-opens=", &tail)) {
2412 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2413 return JNI_ENOMEM;
2414 }
2415 } else if (match_option(option, "--add-modules=", &tail)) {
2416 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2417 return JNI_ENOMEM;
2418 }
2419 } else if (match_option(option, "--enable-native-access=", &tail)) {
2420 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2421 return JNI_ENOMEM;
2422 }
2423 } else if (match_option(option, "--limit-modules=", &tail)) {
2424 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2425 return JNI_ENOMEM;
2426 }
2427 } else if (match_option(option, "--module-path=", &tail)) {
2428 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2429 return JNI_ENOMEM;
2430 }
2431 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2432 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2433 return JNI_ENOMEM;
2434 }
2435 } else if (match_option(option, "--patch-module=", &tail)) {
2436 // --patch-module=<module>=<file>(<pathsep><file>)*
2437 int res = process_patch_mod_option(tail, patch_mod_javabase);
2438 if (res != JNI_OK) {
2439 return res;
2440 }
2441 } else if (match_option(option, "--illegal-access=", &tail)) {
2442 char version[256];
2443 JDK_Version::jdk(17).to_string(version, sizeof(version));
2444 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2445 // -agentlib and -agentpath
2446 } else if (match_option(option, "-agentlib:", &tail) ||
2447 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2448 if(tail != NULL) {
2449 const char* pos = strchr(tail, '=');
2450 char* name;
2451 if (pos == NULL) {
2452 name = os::strdup_check_oom(tail, mtArguments);
2453 } else {
2454 size_t len = pos - tail;
2455 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2456 memcpy(name, tail, len);
2457 name[len] = '\0';
2458 }
2459
2460 char *options = NULL;
2461 if(pos != NULL) {
2462 options = os::strdup_check_oom(pos + 1, mtArguments);
2463 }
2464 #if !INCLUDE_JVMTI
2465 if (valid_jdwp_agent(name, is_absolute_path)) {
2466 jio_fprintf(defaultStream::error_stream(),
2467 "Debugging agents are not supported in this VM\n");
2468 return JNI_ERR;
2469 }
2470 #endif // !INCLUDE_JVMTI
2471 add_init_agent(name, options, is_absolute_path);
2472 }
2473 // -javaagent
2474 } else if (match_option(option, "-javaagent:", &tail)) {
2475 #if !INCLUDE_JVMTI
2476 jio_fprintf(defaultStream::error_stream(),
2477 "Instrumentation agents are not supported in this VM\n");
2478 return JNI_ERR;
2479 #else
2480 if (tail != NULL) {
2481 size_t length = strlen(tail) + 1;
2482 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2483 jio_snprintf(options, length, "%s", tail);
2484 add_instrument_agent("instrument", options, false);
2485 // java agents need module java.instrument
2486 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2487 return JNI_ENOMEM;
2488 }
2489 }
2490 #endif // !INCLUDE_JVMTI
2491 // --enable_preview
2492 } else if (match_option(option, "--enable-preview")) {
2493 set_enable_preview();
2494 // -Xnoclassgc
2495 } else if (match_option(option, "-Xnoclassgc")) {
2496 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2497 return JNI_EINVAL;
2498 }
2499 // -Xbatch
2500 } else if (match_option(option, "-Xbatch")) {
2501 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2502 return JNI_EINVAL;
2503 }
2504 // -Xmn for compatibility with other JVM vendors
2505 } else if (match_option(option, "-Xmn", &tail)) {
2506 julong long_initial_young_size = 0;
2507 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2508 if (errcode != arg_in_range) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Invalid initial young generation size: %s\n", option->optionString);
2511 describe_range_error(errcode);
2512 return JNI_EINVAL;
2513 }
2514 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2515 return JNI_EINVAL;
2516 }
2517 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2518 return JNI_EINVAL;
2519 }
2520 // -Xms
2521 } else if (match_option(option, "-Xms", &tail)) {
2522 julong size = 0;
2523 // an initial heap size of 0 means automatically determine
2524 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2525 if (errcode != arg_in_range) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Invalid initial heap size: %s\n", option->optionString);
2528 describe_range_error(errcode);
2529 return JNI_EINVAL;
2530 }
2531 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2532 return JNI_EINVAL;
2533 }
2534 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2535 return JNI_EINVAL;
2536 }
2537 // -Xmx
2538 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2539 julong long_max_heap_size = 0;
2540 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2541 if (errcode != arg_in_range) {
2542 jio_fprintf(defaultStream::error_stream(),
2543 "Invalid maximum heap size: %s\n", option->optionString);
2544 describe_range_error(errcode);
2545 return JNI_EINVAL;
2546 }
2547 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2548 return JNI_EINVAL;
2549 }
2550 // Xmaxf
2551 } else if (match_option(option, "-Xmaxf", &tail)) {
2552 char* err;
2553 int maxf = (int)(strtod(tail, &err) * 100);
2554 if (*err != '\0' || *tail == '\0') {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Bad max heap free percentage size: %s\n",
2557 option->optionString);
2558 return JNI_EINVAL;
2559 } else {
2560 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2561 return JNI_EINVAL;
2562 }
2563 }
2564 // Xminf
2565 } else if (match_option(option, "-Xminf", &tail)) {
2566 char* err;
2567 int minf = (int)(strtod(tail, &err) * 100);
2568 if (*err != '\0' || *tail == '\0') {
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Bad min heap free percentage size: %s\n",
2571 option->optionString);
2572 return JNI_EINVAL;
2573 } else {
2574 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 }
2578 // -Xss
2579 } else if (match_option(option, "-Xss", &tail)) {
2580 intx value = 0;
2581 jint err = parse_xss(option, tail, &value);
2582 if (err != JNI_OK) {
2583 return err;
2584 }
2585 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2586 return JNI_EINVAL;
2587 }
2588 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2589 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2590 julong long_ReservedCodeCacheSize = 0;
2591
2592 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2593 if (errcode != arg_in_range) {
2594 jio_fprintf(defaultStream::error_stream(),
2595 "Invalid maximum code cache size: %s.\n", option->optionString);
2596 return JNI_EINVAL;
2597 }
2598 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2599 return JNI_EINVAL;
2600 }
2601 // -green
2602 } else if (match_option(option, "-green")) {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Green threads support not available\n");
2605 return JNI_EINVAL;
2606 // -native
2607 } else if (match_option(option, "-native")) {
2608 // HotSpot always uses native threads, ignore silently for compatibility
2609 // -Xrs
2610 } else if (match_option(option, "-Xrs")) {
2611 // Classic/EVM option, new functionality
2612 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 // -Xprof
2616 } else if (match_option(option, "-Xprof")) {
2617 char version[256];
2618 // Obsolete in JDK 10
2619 JDK_Version::jdk(10).to_string(version, sizeof(version));
2620 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2621 // -Xinternalversion
2622 } else if (match_option(option, "-Xinternalversion")) {
2623 jio_fprintf(defaultStream::output_stream(), "%s\n",
2624 VM_Version::internal_vm_info_string());
2625 vm_exit(0);
2626 #ifndef PRODUCT
2627 // -Xprintflags
2628 } else if (match_option(option, "-Xprintflags")) {
2629 JVMFlag::printFlags(tty, false);
2630 vm_exit(0);
2631 #endif
2632 // -D
2633 } else if (match_option(option, "-D", &tail)) {
2634 const char* value;
2635 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2636 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2637 // abort if -Djava.endorsed.dirs is set
2638 jio_fprintf(defaultStream::output_stream(),
2639 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2640 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2641 return JNI_EINVAL;
2642 }
2643 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2644 *value != '\0' && strcmp(value, "\"\"") != 0) {
2645 // abort if -Djava.ext.dirs is set
2646 jio_fprintf(defaultStream::output_stream(),
2647 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2648 return JNI_EINVAL;
2649 }
2650 // Check for module related properties. They must be set using the modules
2651 // options. For example: use "--add-modules=java.sql", not
2652 // "-Djdk.module.addmods=java.sql"
2653 if (is_internal_module_property(option->optionString + 2)) {
2654 needs_module_property_warning = true;
2655 continue;
2656 }
2657 if (!add_property(tail)) {
2658 return JNI_ENOMEM;
2659 }
2660 // Out of the box management support
2661 if (match_option(option, "-Dcom.sun.management", &tail)) {
2662 #if INCLUDE_MANAGEMENT
2663 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 // management agent in module jdk.management.agent
2667 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2668 return JNI_ENOMEM;
2669 }
2670 #else
2671 jio_fprintf(defaultStream::output_stream(),
2672 "-Dcom.sun.management is not supported in this VM.\n");
2673 return JNI_ERR;
2674 #endif
2675 }
2676 // -Xint
2677 } else if (match_option(option, "-Xint")) {
2678 set_mode_flags(_int);
2679 // -Xmixed
2680 } else if (match_option(option, "-Xmixed")) {
2681 set_mode_flags(_mixed);
2682 // -Xcomp
2683 } else if (match_option(option, "-Xcomp")) {
2684 // for testing the compiler; turn off all flags that inhibit compilation
2685 set_mode_flags(_comp);
2686 // -Xshare:dump
2687 } else if (match_option(option, "-Xshare:dump")) {
2688 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 // -Xshare:on
2692 } else if (match_option(option, "-Xshare:on")) {
2693 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2694 return JNI_EINVAL;
2695 }
2696 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2697 return JNI_EINVAL;
2698 }
2699 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2700 } else if (match_option(option, "-Xshare:auto")) {
2701 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 // -Xshare:off
2708 } else if (match_option(option, "-Xshare:off")) {
2709 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2710 return JNI_EINVAL;
2711 }
2712 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 // -Xverify
2716 } else if (match_option(option, "-Xverify", &tail)) {
2717 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2718 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2719 return JNI_EINVAL;
2720 }
2721 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 } else if (strcmp(tail, ":remote") == 0) {
2725 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2726 return JNI_EINVAL;
2727 }
2728 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 } else if (strcmp(tail, ":none") == 0) {
2732 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2736 return JNI_EINVAL;
2737 }
2738 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2739 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2740 return JNI_EINVAL;
2741 }
2742 // -Xdebug
2743 } else if (match_option(option, "-Xdebug")) {
2744 // note this flag has been used, then ignore
2745 set_xdebug_mode(true);
2746 // -Xnoagent
2747 } else if (match_option(option, "-Xnoagent")) {
2748 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2749 } else if (match_option(option, "-Xloggc:", &tail)) {
2750 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2751 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2752 _legacyGCLogging.lastFlag = 2;
2753 _legacyGCLogging.file = os::strdup_check_oom(tail);
2754 } else if (match_option(option, "-Xlog", &tail)) {
2755 bool ret = false;
2756 if (strcmp(tail, ":help") == 0) {
2757 fileStream stream(defaultStream::output_stream());
2758 LogConfiguration::print_command_line_help(&stream);
2759 vm_exit(0);
2760 } else if (strcmp(tail, ":disable") == 0) {
2761 LogConfiguration::disable_logging();
2762 ret = true;
2763 } else if (strcmp(tail, ":async") == 0) {
2764 LogConfiguration::set_async_mode(true);
2765 ret = true;
2766 } else if (*tail == '\0') {
2767 ret = LogConfiguration::parse_command_line_arguments();
2768 assert(ret, "-Xlog without arguments should never fail to parse");
2769 } else if (*tail == ':') {
2770 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2771 }
2772 if (ret == false) {
2773 jio_fprintf(defaultStream::error_stream(),
2774 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2775 tail);
2776 return JNI_EINVAL;
2777 }
2778 // JNI hooks
2779 } else if (match_option(option, "-Xcheck", &tail)) {
2780 if (!strcmp(tail, ":jni")) {
2781 #if !INCLUDE_JNI_CHECK
2782 warning("JNI CHECKING is not supported in this VM");
2783 #else
2784 CheckJNICalls = true;
2785 #endif // INCLUDE_JNI_CHECK
2786 } else if (is_bad_option(option, args->ignoreUnrecognized,
2787 "check")) {
2788 return JNI_EINVAL;
2789 }
2790 } else if (match_option(option, "vfprintf")) {
2791 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2792 } else if (match_option(option, "exit")) {
2793 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2794 } else if (match_option(option, "abort")) {
2795 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2796 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2797 // and the last option wins.
2798 } else if (match_option(option, "-XX:+NeverTenure")) {
2799 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2800 return JNI_EINVAL;
2801 }
2802 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2809 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2816 return JNI_EINVAL;
2817 }
2818 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2819 uintx max_tenuring_thresh = 0;
2820 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2823 return JNI_EINVAL;
2824 }
2825
2826 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829
2830 if (MaxTenuringThreshold == 0) {
2831 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 } else {
2838 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2842 return JNI_EINVAL;
2843 }
2844 }
2845 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2846 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2847 return JNI_EINVAL;
2848 }
2849 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2850 return JNI_EINVAL;
2851 }
2852 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2853 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2857 return JNI_EINVAL;
2858 }
2859 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2860 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2867 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2871 return JNI_EINVAL;
2872 }
2873 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2874 #if defined(DTRACE_ENABLED)
2875 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2879 return JNI_EINVAL;
2880 }
2881 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 #else // defined(DTRACE_ENABLED)
2888 jio_fprintf(defaultStream::error_stream(),
2889 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2890 return JNI_EINVAL;
2891 #endif // defined(DTRACE_ENABLED)
2892 #ifdef ASSERT
2893 } else if (match_option(option, "-XX:+FullGCALot")) {
2894 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2895 return JNI_EINVAL;
2896 }
2897 // disable scavenge before parallel mark-compact
2898 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2899 return JNI_EINVAL;
2900 }
2901 #endif
2902 #if !INCLUDE_MANAGEMENT
2903 } else if (match_option(option, "-XX:+ManagementServer")) {
2904 jio_fprintf(defaultStream::error_stream(),
2905 "ManagementServer is not supported in this VM.\n");
2906 return JNI_ERR;
2907 #endif // INCLUDE_MANAGEMENT
2908 #if INCLUDE_JVMCI
2909 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2910 if (EnableJVMCIProduct) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2913 return JNI_EINVAL;
2914 }
2915 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2916 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
2917 if (EnableJVMCIProduct) {
2918 continue;
2919 }
2920 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2921 // Allow this flag if it has been unlocked.
2922 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2923 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2924 jio_fprintf(defaultStream::error_stream(),
2925 "Unable to enable JVMCI in product mode");
2926 return JNI_ERR;
2927 }
2928 }
2929 // The flag was locked so process normally to report that error
2930 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2931 return JNI_EINVAL;
2932 }
2933 #endif // INCLUDE_JVMCI
2934 #if INCLUDE_JFR
2935 } else if (match_jfr_option(&option)) {
2936 return JNI_EINVAL;
2937 #endif
2938 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2939 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2940 // already been handled
2941 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2942 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2943 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2944 return JNI_EINVAL;
2945 }
2946 }
2947 // Unknown option
2948 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2949 return JNI_ERR;
2950 }
2951 }
2952
2953 // PrintSharedArchiveAndExit will turn on
2954 // -Xshare:on
2955 // -Xlog:class+path=info
2956 if (PrintSharedArchiveAndExit) {
2957 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2958 return JNI_EINVAL;
2959 }
2960 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2964 }
2965
2966 fix_appclasspath();
2967
2968 return JNI_OK;
2969 }
2970
2971 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2972 // For java.base check for duplicate --patch-module options being specified on the command line.
2973 // This check is only required for java.base, all other duplicate module specifications
2974 // will be checked during module system initialization. The module system initialization
2975 // will throw an ExceptionInInitializerError if this situation occurs.
2976 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2977 if (*patch_mod_javabase) {
2978 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2979 } else {
2980 *patch_mod_javabase = true;
2981 }
2982 }
2983
2984 // Create GrowableArray lazily, only if --patch-module has been specified
2985 if (_patch_mod_prefix == NULL) {
2986 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2987 }
2988
2989 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2990 }
2991
2992 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2993 //
2994 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2995 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2996 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2997 // path is treated as the current directory.
2998 //
2999 // This causes problems with CDS, which requires that all directories specified in the classpath
3000 // must be empty. In most cases, applications do NOT want to load classes from the current
3001 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3002 // scripts compatible with CDS.
3003 void Arguments::fix_appclasspath() {
3004 if (IgnoreEmptyClassPaths) {
3005 const char separator = *os::path_separator();
3006 const char* src = _java_class_path->value();
3007
3008 // skip over all the leading empty paths
3009 while (*src == separator) {
3010 src ++;
3011 }
3012
3013 char* copy = os::strdup_check_oom(src, mtArguments);
3014
3015 // trim all trailing empty paths
3016 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3017 *tail = '\0';
3018 }
3019
3020 char from[3] = {separator, separator, '\0'};
3021 char to [2] = {separator, '\0'};
3022 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3023 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3024 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3025 }
3026
3027 _java_class_path->set_writeable_value(copy);
3028 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3029 }
3030 }
3031
3032 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3033 // check if the default lib/endorsed directory exists; if so, error
3034 char path[JVM_MAXPATHLEN];
3035 const char* fileSep = os::file_separator();
3036 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3037
3038 DIR* dir = os::opendir(path);
3039 if (dir != NULL) {
3040 jio_fprintf(defaultStream::output_stream(),
3041 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3042 "in modular form will be supported via the concept of upgradeable modules.\n");
3043 os::closedir(dir);
3044 return JNI_ERR;
3045 }
3046
3047 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3048 dir = os::opendir(path);
3049 if (dir != NULL) {
3050 jio_fprintf(defaultStream::output_stream(),
3051 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3052 "Use -classpath instead.\n.");
3053 os::closedir(dir);
3054 return JNI_ERR;
3055 }
3056
3057 // This must be done after all arguments have been processed
3058 // and the container support has been initialized since AggressiveHeap
3059 // relies on the amount of total memory available.
3060 if (AggressiveHeap) {
3061 jint result = set_aggressive_heap_flags();
3062 if (result != JNI_OK) {
3063 return result;
3064 }
3065 }
3066
3067 // This must be done after all arguments have been processed.
3068 // java_compiler() true means set to "NONE" or empty.
3069 if (java_compiler() && !xdebug_mode()) {
3070 // For backwards compatibility, we switch to interpreted mode if
3071 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3072 // not specified.
3073 set_mode_flags(_int);
3074 }
3075
3076 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3077 // but like -Xint, leave compilation thresholds unaffected.
3078 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3079 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3080 set_mode_flags(_int);
3081 }
3082
3083 #ifdef ZERO
3084 // Zero always runs in interpreted mode
3085 set_mode_flags(_int);
3086 #endif
3087
3088 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3089 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3090 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3091 }
3092
3093 #if !COMPILER2_OR_JVMCI
3094 // Don't degrade server performance for footprint
3095 if (FLAG_IS_DEFAULT(UseLargePages) &&
3096 MaxHeapSize < LargePageHeapSizeThreshold) {
3097 // No need for large granularity pages w/small heaps.
3098 // Note that large pages are enabled/disabled for both the
3099 // Java heap and the code cache.
3100 FLAG_SET_DEFAULT(UseLargePages, false);
3101 }
3102
3103 UNSUPPORTED_OPTION(ProfileInterpreter);
3104 #endif
3105
3106 // Parse the CompilationMode flag
3107 if (!CompilationModeFlag::initialize()) {
3108 return JNI_ERR;
3109 }
3110
3111 if (!check_vm_args_consistency()) {
3112 return JNI_ERR;
3113 }
3114
3115 #if INCLUDE_CDS
3116 if (DumpSharedSpaces) {
3117 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3118 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3119 // compiler just to be safe.
3120 //
3121 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3122 // instead of modifying them in place. The copy is inaccessible to the compiler.
3123 // TODO: revisit the following for the static archive case.
3124 set_mode_flags(_int);
3125 }
3126
3127 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3128 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) {
3129 jio_fprintf(defaultStream::output_stream(),
3130 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3131 return JNI_ERR;
3132 }
3133
3134 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) {
3135 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3136 } else {
3137 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, true);
3138 }
3139
3140 if (UseSharedSpaces && patch_mod_javabase) {
3141 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3142 }
3143 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3144 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3145 }
3146
3147 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
3148 // Always verify non-system classes during CDS dump
3149 if (!BytecodeVerificationRemote) {
3150 BytecodeVerificationRemote = true;
3151 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3152 }
3153 }
3154 #endif
3155
3156 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3157 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3158 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3159
3160 return JNI_OK;
3161 }
3162
3163 // Helper class for controlling the lifetime of JavaVMInitArgs
3164 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3165 // deleted on the destruction of the ScopedVMInitArgs object.
3166 class ScopedVMInitArgs : public StackObj {
3167 private:
3168 JavaVMInitArgs _args;
3169 char* _container_name;
3170 bool _is_set;
3171 char* _vm_options_file_arg;
3172
3173 public:
3174 ScopedVMInitArgs(const char *container_name) {
3175 _args.version = JNI_VERSION_1_2;
3176 _args.nOptions = 0;
3177 _args.options = NULL;
3178 _args.ignoreUnrecognized = false;
3179 _container_name = (char *)container_name;
3180 _is_set = false;
3181 _vm_options_file_arg = NULL;
3182 }
3183
3184 // Populates the JavaVMInitArgs object represented by this
3185 // ScopedVMInitArgs object with the arguments in options. The
3186 // allocated memory is deleted by the destructor. If this method
3187 // returns anything other than JNI_OK, then this object is in a
3188 // partially constructed state, and should be abandoned.
3189 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3190 _is_set = true;
3191 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3192 JavaVMOption, options->length(), mtArguments);
3193 if (options_arr == NULL) {
3194 return JNI_ENOMEM;
3195 }
3196 _args.options = options_arr;
3197
3198 for (int i = 0; i < options->length(); i++) {
3199 options_arr[i] = options->at(i);
3200 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3201 if (options_arr[i].optionString == NULL) {
3202 // Rely on the destructor to do cleanup.
3203 _args.nOptions = i;
3204 return JNI_ENOMEM;
3205 }
3206 }
3207
3208 _args.nOptions = options->length();
3209 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3210 return JNI_OK;
3211 }
3212
3213 JavaVMInitArgs* get() { return &_args; }
3214 char* container_name() { return _container_name; }
3215 bool is_set() { return _is_set; }
3216 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3217 char* vm_options_file_arg() { return _vm_options_file_arg; }
3218
3219 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3220 if (_vm_options_file_arg != NULL) {
3221 os::free(_vm_options_file_arg);
3222 }
3223 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3224 }
3225
3226 ~ScopedVMInitArgs() {
3227 if (_vm_options_file_arg != NULL) {
3228 os::free(_vm_options_file_arg);
3229 }
3230 if (_args.options == NULL) return;
3231 for (int i = 0; i < _args.nOptions; i++) {
3232 os::free(_args.options[i].optionString);
3233 }
3234 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3235 }
3236
3237 // Insert options into this option list, to replace option at
3238 // vm_options_file_pos (-XX:VMOptionsFile)
3239 jint insert(const JavaVMInitArgs* args,
3240 const JavaVMInitArgs* args_to_insert,
3241 const int vm_options_file_pos) {
3242 assert(_args.options == NULL, "shouldn't be set yet");
3243 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3244 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3245
3246 int length = args->nOptions + args_to_insert->nOptions - 1;
3247 // Construct new option array
3248 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3249 for (int i = 0; i < args->nOptions; i++) {
3250 if (i == vm_options_file_pos) {
3251 // insert the new options starting at the same place as the
3252 // -XX:VMOptionsFile option
3253 for (int j = 0; j < args_to_insert->nOptions; j++) {
3254 options.push(args_to_insert->options[j]);
3255 }
3256 } else {
3257 options.push(args->options[i]);
3258 }
3259 }
3260 // make into options array
3261 return set_args(&options);
3262 }
3263 };
3264
3265 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3266 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3267 }
3268
3269 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3270 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3271 }
3272
3273 jint Arguments::parse_options_environment_variable(const char* name,
3274 ScopedVMInitArgs* vm_args) {
3275 char *buffer = ::getenv(name);
3276
3277 // Don't check this environment variable if user has special privileges
3278 // (e.g. unix su command).
3279 if (buffer == NULL || os::have_special_privileges()) {
3280 return JNI_OK;
3281 }
3282
3283 if ((buffer = os::strdup(buffer)) == NULL) {
3284 return JNI_ENOMEM;
3285 }
3286
3287 jio_fprintf(defaultStream::error_stream(),
3288 "Picked up %s: %s\n", name, buffer);
3289
3290 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3291
3292 os::free(buffer);
3293 return retcode;
3294 }
3295
3296 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3297 // read file into buffer
3298 int fd = ::open(file_name, O_RDONLY);
3299 if (fd < 0) {
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Could not open options file '%s'\n",
3302 file_name);
3303 return JNI_ERR;
3304 }
3305
3306 struct stat stbuf;
3307 int retcode = os::stat(file_name, &stbuf);
3308 if (retcode != 0) {
3309 jio_fprintf(defaultStream::error_stream(),
3310 "Could not stat options file '%s'\n",
3311 file_name);
3312 os::close(fd);
3313 return JNI_ERR;
3314 }
3315
3316 if (stbuf.st_size == 0) {
3317 // tell caller there is no option data and that is ok
3318 os::close(fd);
3319 return JNI_OK;
3320 }
3321
3322 // '+ 1' for NULL termination even with max bytes
3323 size_t bytes_alloc = stbuf.st_size + 1;
3324
3325 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3326 if (NULL == buf) {
3327 jio_fprintf(defaultStream::error_stream(),
3328 "Could not allocate read buffer for options file parse\n");
3329 os::close(fd);
3330 return JNI_ENOMEM;
3331 }
3332
3333 memset(buf, 0, bytes_alloc);
3334
3335 // Fill buffer
3336 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3337 os::close(fd);
3338 if (bytes_read < 0) {
3339 FREE_C_HEAP_ARRAY(char, buf);
3340 jio_fprintf(defaultStream::error_stream(),
3341 "Could not read options file '%s'\n", file_name);
3342 return JNI_ERR;
3343 }
3344
3345 if (bytes_read == 0) {
3346 // tell caller there is no option data and that is ok
3347 FREE_C_HEAP_ARRAY(char, buf);
3348 return JNI_OK;
3349 }
3350
3351 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3352
3353 FREE_C_HEAP_ARRAY(char, buf);
3354 return retcode;
3355 }
3356
3357 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3358 // Construct option array
3359 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3360
3361 // some pointers to help with parsing
3362 char *buffer_end = buffer + buf_len;
3363 char *opt_hd = buffer;
3364 char *wrt = buffer;
3365 char *rd = buffer;
3366
3367 // parse all options
3368 while (rd < buffer_end) {
3369 // skip leading white space from the input string
3370 while (rd < buffer_end && isspace(*rd)) {
3371 rd++;
3372 }
3373
3374 if (rd >= buffer_end) {
3375 break;
3376 }
3377
3378 // Remember this is where we found the head of the token.
3379 opt_hd = wrt;
3380
3381 // Tokens are strings of non white space characters separated
3382 // by one or more white spaces.
3383 while (rd < buffer_end && !isspace(*rd)) {
3384 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3385 int quote = *rd; // matching quote to look for
3386 rd++; // don't copy open quote
3387 while (rd < buffer_end && *rd != quote) {
3388 // include everything (even spaces)
3389 // up until the close quote
3390 *wrt++ = *rd++; // copy to option string
3391 }
3392
3393 if (rd < buffer_end) {
3394 rd++; // don't copy close quote
3395 } else {
3396 // did not see closing quote
3397 jio_fprintf(defaultStream::error_stream(),
3398 "Unmatched quote in %s\n", name);
3399 return JNI_ERR;
3400 }
3401 } else {
3402 *wrt++ = *rd++; // copy to option string
3403 }
3404 }
3405
3406 // steal a white space character and set it to NULL
3407 *wrt++ = '\0';
3408 // We now have a complete token
3409
3410 JavaVMOption option;
3411 option.optionString = opt_hd;
3412 option.extraInfo = NULL;
3413
3414 options.append(option); // Fill in option
3415
3416 rd++; // Advance to next character
3417 }
3418
3419 // Fill out JavaVMInitArgs structure.
3420 return vm_args->set_args(&options);
3421 }
3422
3423 jint Arguments::set_shared_spaces_flags_and_archive_paths() {
3424 if (DumpSharedSpaces) {
3425 if (RequireSharedSpaces) {
3426 warning("Cannot dump shared archive while using shared archive");
3427 }
3428 UseSharedSpaces = false;
3429 }
3430 #if INCLUDE_CDS
3431 // Initialize shared archive paths which could include both base and dynamic archive paths
3432 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3433 init_shared_archive_paths();
3434 #endif // INCLUDE_CDS
3435 return JNI_OK;
3436 }
3437
3438 #if INCLUDE_CDS
3439 // Sharing support
3440 // Construct the path to the archive
3441 char* Arguments::get_default_shared_archive_path() {
3442 char *default_archive_path;
3443 char jvm_path[JVM_MAXPATHLEN];
3444 os::jvm_path(jvm_path, sizeof(jvm_path));
3445 char *end = strrchr(jvm_path, *os::file_separator());
3446 if (end != NULL) *end = '\0';
3447 size_t jvm_path_len = strlen(jvm_path);
3448 size_t file_sep_len = strlen(os::file_separator());
3449 const size_t len = jvm_path_len + file_sep_len + 20;
3450 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3451 jio_snprintf(default_archive_path, len,
3452 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3453 jvm_path, os::file_separator());
3454 return default_archive_path;
3455 }
3456
3457 int Arguments::num_archives(const char* archive_path) {
3458 if (archive_path == NULL) {
3459 return 0;
3460 }
3461 int npaths = 1;
3462 char* p = (char*)archive_path;
3463 while (*p != '\0') {
3464 if (*p == os::path_separator()[0]) {
3465 npaths++;
3466 }
3467 p++;
3468 }
3469 return npaths;
3470 }
3471
3472 void Arguments::extract_shared_archive_paths(const char* archive_path,
3473 char** base_archive_path,
3474 char** top_archive_path) {
3475 char* begin_ptr = (char*)archive_path;
3476 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3477 if (end_ptr == NULL || end_ptr == begin_ptr) {
3478 vm_exit_during_initialization("Base archive was not specified", archive_path);
3479 }
3480 size_t len = end_ptr - begin_ptr;
3481 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3482 strncpy(cur_path, begin_ptr, len);
3483 cur_path[len] = '\0';
3484 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3485 *base_archive_path = cur_path;
3486
3487 begin_ptr = ++end_ptr;
3488 if (*begin_ptr == '\0') {
3489 vm_exit_during_initialization("Top archive was not specified", archive_path);
3490 }
3491 end_ptr = strchr(begin_ptr, '\0');
3492 assert(end_ptr != NULL, "sanity");
3493 len = end_ptr - begin_ptr;
3494 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3495 strncpy(cur_path, begin_ptr, len + 1);
3496 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3497 *top_archive_path = cur_path;
3498 }
3499
3500 void Arguments::init_shared_archive_paths() {
3501 if (ArchiveClassesAtExit != nullptr) {
3502 assert(!RecordDynamicDumpInfo, "already checked");
3503 if (DumpSharedSpaces) {
3504 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3505 }
3506 check_unsupported_dumping_properties();
3507 }
3508
3509 if (SharedArchiveFile == nullptr) {
3510 SharedArchivePath = get_default_shared_archive_path();
3511 } else {
3512 int archives = num_archives(SharedArchiveFile);
3513 assert(archives > 0, "must be");
3514
3515 if (is_dumping_archive() && archives > 1) {
3516 vm_exit_during_initialization(
3517 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3518 }
3519
3520 if (DumpSharedSpaces) {
3521 assert(archives == 1, "must be");
3522 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3523 // will be overwritten no matter regardless of its contents
3524 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3525 } else {
3526 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3527 // is read from top.jsa
3528 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3529 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3530 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3531 //
3532 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3533 // allow cases (b) and (c). Case (b) is already checked above.
3534
3535 if (archives > 2) {
3536 vm_exit_during_initialization(
3537 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3538 }
3539 if (archives == 1) {
3540 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3541 bool success =
3542 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &SharedArchivePath);
3543 if (!success) {
3544 SharedArchivePath = temp_archive_path;
3545 } else {
3546 SharedDynamicArchivePath = temp_archive_path;
3547 }
3548 } else {
3549 extract_shared_archive_paths((const char*)SharedArchiveFile,
3550 &SharedArchivePath, &SharedDynamicArchivePath);
3551 }
3552
3553 if (SharedDynamicArchivePath != nullptr) {
3554 // Check for case (c)
3555 if (RecordDynamicDumpInfo) {
3556 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3557 SharedArchiveFile);
3558 }
3559 if (ArchiveClassesAtExit != nullptr) {
3560 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3561 SharedArchiveFile);
3562 }
3563 }
3564
3565 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3566 vm_exit_during_initialization(
3567 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3568 SharedArchiveFile);
3569 }
3570 }
3571 }
3572 }
3573 #endif // INCLUDE_CDS
3574
3575 #ifndef PRODUCT
3576 // Determine whether LogVMOutput should be implicitly turned on.
3577 static bool use_vm_log() {
3578 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3579 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3580 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3581 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3582 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3583 return true;
3584 }
3585
3586 #ifdef COMPILER1
3587 if (PrintC1Statistics) {
3588 return true;
3589 }
3590 #endif // COMPILER1
3591
3592 #ifdef COMPILER2
3593 if (PrintOptoAssembly || PrintOptoStatistics) {
3594 return true;
3595 }
3596 #endif // COMPILER2
3597
3598 return false;
3599 }
3600
3601 #endif // PRODUCT
3602
3603 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3604 for (int index = 0; index < args->nOptions; index++) {
3605 const JavaVMOption* option = args->options + index;
3606 const char* tail;
3607 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3608 return true;
3609 }
3610 }
3611 return false;
3612 }
3613
3614 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3615 const char* vm_options_file,
3616 const int vm_options_file_pos,
3617 ScopedVMInitArgs* vm_options_file_args,
3618 ScopedVMInitArgs* args_out) {
3619 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3620 if (code != JNI_OK) {
3621 return code;
3622 }
3623
3624 if (vm_options_file_args->get()->nOptions < 1) {
3625 return JNI_OK;
3626 }
3627
3628 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3629 jio_fprintf(defaultStream::error_stream(),
3630 "A VM options file may not refer to a VM options file. "
3631 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3632 "options file '%s' in options container '%s' is an error.\n",
3633 vm_options_file_args->vm_options_file_arg(),
3634 vm_options_file_args->container_name());
3635 return JNI_EINVAL;
3636 }
3637
3638 return args_out->insert(args, vm_options_file_args->get(),
3639 vm_options_file_pos);
3640 }
3641
3642 // Expand -XX:VMOptionsFile found in args_in as needed.
3643 // mod_args and args_out parameters may return values as needed.
3644 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3645 ScopedVMInitArgs* mod_args,
3646 JavaVMInitArgs** args_out) {
3647 jint code = match_special_option_and_act(args_in, mod_args);
3648 if (code != JNI_OK) {
3649 return code;
3650 }
3651
3652 if (mod_args->is_set()) {
3653 // args_in contains -XX:VMOptionsFile and mod_args contains the
3654 // original options from args_in along with the options expanded
3655 // from the VMOptionsFile. Return a short-hand to the caller.
3656 *args_out = mod_args->get();
3657 } else {
3658 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3659 }
3660 return JNI_OK;
3661 }
3662
3663 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3664 ScopedVMInitArgs* args_out) {
3665 // Remaining part of option string
3666 const char* tail;
3667 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3668
3669 for (int index = 0; index < args->nOptions; index++) {
3670 const JavaVMOption* option = args->options + index;
3671 if (match_option(option, "-XX:Flags=", &tail)) {
3672 Arguments::set_jvm_flags_file(tail);
3673 continue;
3674 }
3675 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3676 if (vm_options_file_args.found_vm_options_file_arg()) {
3677 jio_fprintf(defaultStream::error_stream(),
3678 "The option '%s' is already specified in the options "
3679 "container '%s' so the specification of '%s' in the "
3680 "same options container is an error.\n",
3681 vm_options_file_args.vm_options_file_arg(),
3682 vm_options_file_args.container_name(),
3683 option->optionString);
3684 return JNI_EINVAL;
3685 }
3686 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3687 // If there's a VMOptionsFile, parse that
3688 jint code = insert_vm_options_file(args, tail, index,
3689 &vm_options_file_args, args_out);
3690 if (code != JNI_OK) {
3691 return code;
3692 }
3693 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3694 if (args_out->is_set()) {
3695 // The VMOptions file inserted some options so switch 'args'
3696 // to the new set of options, and continue processing which
3697 // preserves "last option wins" semantics.
3698 args = args_out->get();
3699 // The first option from the VMOptionsFile replaces the
3700 // current option. So we back track to process the
3701 // replacement option.
3702 index--;
3703 }
3704 continue;
3705 }
3706 if (match_option(option, "-XX:+PrintVMOptions")) {
3707 PrintVMOptions = true;
3708 continue;
3709 }
3710 if (match_option(option, "-XX:-PrintVMOptions")) {
3711 PrintVMOptions = false;
3712 continue;
3713 }
3714 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3715 IgnoreUnrecognizedVMOptions = true;
3716 continue;
3717 }
3718 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3719 IgnoreUnrecognizedVMOptions = false;
3720 continue;
3721 }
3722 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3723 JVMFlag::printFlags(tty, false);
3724 vm_exit(0);
3725 }
3726
3727 #ifndef PRODUCT
3728 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3729 JVMFlag::printFlags(tty, true);
3730 vm_exit(0);
3731 }
3732 #endif
3733 }
3734 return JNI_OK;
3735 }
3736
3737 static void print_options(const JavaVMInitArgs *args) {
3738 const char* tail;
3739 for (int index = 0; index < args->nOptions; index++) {
3740 const JavaVMOption *option = args->options + index;
3741 if (match_option(option, "-XX:", &tail)) {
3742 logOption(tail);
3743 }
3744 }
3745 }
3746
3747 bool Arguments::handle_deprecated_print_gc_flags() {
3748 if (PrintGC) {
3749 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3750 }
3751 if (PrintGCDetails) {
3752 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3753 }
3754
3755 if (_legacyGCLogging.lastFlag == 2) {
3756 // -Xloggc was used to specify a filename
3757 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3758
3759 LogTarget(Error, logging) target;
3760 LogStream errstream(target);
3761 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream);
3762 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3763 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3764 }
3765 return true;
3766 }
3767
3768 static void apply_debugger_ergo() {
3769 if (ReplayCompiles) {
3770 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3771 }
3772
3773 if (UseDebuggerErgo) {
3774 // Turn on sub-flags
3775 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3776 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3777 }
3778
3779 if (UseDebuggerErgo2) {
3780 // Debugging with limited number of CPUs
3781 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3782 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3783 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3784 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3785 }
3786 }
3787
3788 // Parse entry point called from JNI_CreateJavaVM
3789
3790 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3791 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3792 JVMFlag::check_all_flag_declarations();
3793
3794 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3795 const char* hotspotrc = ".hotspotrc";
3796 bool settings_file_specified = false;
3797 bool needs_hotspotrc_warning = false;
3798 ScopedVMInitArgs initial_vm_options_args("");
3799 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3800 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3801
3802 // Pointers to current working set of containers
3803 JavaVMInitArgs* cur_cmd_args;
3804 JavaVMInitArgs* cur_vm_options_args;
3805 JavaVMInitArgs* cur_java_options_args;
3806 JavaVMInitArgs* cur_java_tool_options_args;
3807
3808 // Containers for modified/expanded options
3809 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3810 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3811 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3812 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3813
3814
3815 jint code =
3816 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3817 if (code != JNI_OK) {
3818 return code;
3819 }
3820
3821 code = parse_java_options_environment_variable(&initial_java_options_args);
3822 if (code != JNI_OK) {
3823 return code;
3824 }
3825
3826 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3827 char *vmoptions = ClassLoader::lookup_vm_options();
3828 if (vmoptions != NULL) {
3829 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3830 FREE_C_HEAP_ARRAY(char, vmoptions);
3831 if (code != JNI_OK) {
3832 return code;
3833 }
3834 }
3835
3836 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3837 &mod_java_tool_options_args,
3838 &cur_java_tool_options_args);
3839 if (code != JNI_OK) {
3840 return code;
3841 }
3842
3843 code = expand_vm_options_as_needed(initial_cmd_args,
3844 &mod_cmd_args,
3845 &cur_cmd_args);
3846 if (code != JNI_OK) {
3847 return code;
3848 }
3849
3850 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3851 &mod_java_options_args,
3852 &cur_java_options_args);
3853 if (code != JNI_OK) {
3854 return code;
3855 }
3856
3857 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3858 &mod_vm_options_args,
3859 &cur_vm_options_args);
3860 if (code != JNI_OK) {
3861 return code;
3862 }
3863
3864 const char* flags_file = Arguments::get_jvm_flags_file();
3865 settings_file_specified = (flags_file != NULL);
3866
3867 if (IgnoreUnrecognizedVMOptions) {
3868 cur_cmd_args->ignoreUnrecognized = true;
3869 cur_java_tool_options_args->ignoreUnrecognized = true;
3870 cur_java_options_args->ignoreUnrecognized = true;
3871 }
3872
3873 // Parse specified settings file
3874 if (settings_file_specified) {
3875 if (!process_settings_file(flags_file, true,
3876 cur_cmd_args->ignoreUnrecognized)) {
3877 return JNI_EINVAL;
3878 }
3879 } else {
3880 #ifdef ASSERT
3881 // Parse default .hotspotrc settings file
3882 if (!process_settings_file(".hotspotrc", false,
3883 cur_cmd_args->ignoreUnrecognized)) {
3884 return JNI_EINVAL;
3885 }
3886 #else
3887 struct stat buf;
3888 if (os::stat(hotspotrc, &buf) == 0) {
3889 needs_hotspotrc_warning = true;
3890 }
3891 #endif
3892 }
3893
3894 if (PrintVMOptions) {
3895 print_options(cur_java_tool_options_args);
3896 print_options(cur_cmd_args);
3897 print_options(cur_java_options_args);
3898 }
3899
3900 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3901 jint result = parse_vm_init_args(cur_vm_options_args,
3902 cur_java_tool_options_args,
3903 cur_java_options_args,
3904 cur_cmd_args);
3905
3906 if (result != JNI_OK) {
3907 return result;
3908 }
3909
3910 // Delay warning until here so that we've had a chance to process
3911 // the -XX:-PrintWarnings flag
3912 if (needs_hotspotrc_warning) {
3913 warning("%s file is present but has been ignored. "
3914 "Run with -XX:Flags=%s to load the file.",
3915 hotspotrc, hotspotrc);
3916 }
3917
3918 if (needs_module_property_warning) {
3919 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3920 " names that are reserved for internal use.");
3921 }
3922
3923 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3924 UNSUPPORTED_OPTION(UseLargePages);
3925 #endif
3926
3927 #if defined(AIX)
3928 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3929 #endif
3930
3931 #ifndef PRODUCT
3932 if (TraceBytecodesAt != 0) {
3933 TraceBytecodes = true;
3934 }
3935 if (CountCompiledCalls) {
3936 if (UseCounterDecay) {
3937 warning("UseCounterDecay disabled because CountCalls is set");
3938 UseCounterDecay = false;
3939 }
3940 }
3941 #endif // PRODUCT
3942
3943 if (ScavengeRootsInCode == 0) {
3944 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3945 warning("Forcing ScavengeRootsInCode non-zero");
3946 }
3947 ScavengeRootsInCode = 1;
3948 }
3949
3950 if (!handle_deprecated_print_gc_flags()) {
3951 return JNI_EINVAL;
3952 }
3953
3954 // Set object alignment values.
3955 set_object_alignment();
3956
3957 #if !INCLUDE_CDS
3958 if (DumpSharedSpaces || RequireSharedSpaces) {
3959 jio_fprintf(defaultStream::error_stream(),
3960 "Shared spaces are not supported in this VM\n");
3961 return JNI_ERR;
3962 }
3963 if (DumpLoadedClassList != NULL) {
3964 jio_fprintf(defaultStream::error_stream(),
3965 "DumpLoadedClassList is not supported in this VM\n");
3966 return JNI_ERR;
3967 }
3968 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3969 log_is_enabled(Info, cds)) {
3970 warning("Shared spaces are not supported in this VM");
3971 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3972 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3973 }
3974 no_shared_spaces("CDS Disabled");
3975 #endif // INCLUDE_CDS
3976
3977 #if INCLUDE_NMT
3978 // Verify NMT arguments
3979 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3980 if (lvl == NMT_unknown) {
3981 jio_fprintf(defaultStream::error_stream(),
3982 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3983 return JNI_ERR;
3984 }
3985 if (PrintNMTStatistics && lvl == NMT_off) {
3986 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3987 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3988 }
3989 #else
3990 if (!FLAG_IS_DEFAULT(NativeMemoryTracking) || PrintNMTStatistics) {
3991 warning("Native Memory Tracking is not supported in this VM");
3992 FLAG_SET_DEFAULT(NativeMemoryTracking, "off");
3993 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3994 }
3995 #endif // INCLUDE_NMT
3996
3997 if (TraceDependencies && VerifyDependencies) {
3998 if (!FLAG_IS_DEFAULT(TraceDependencies)) {
3999 warning("TraceDependencies results may be inflated by VerifyDependencies");
4000 }
4001 }
4002
4003 apply_debugger_ergo();
4004
4005 if (log_is_enabled(Info, arguments)) {
4006 LogStream st(Log(arguments)::info());
4007 Arguments::print_on(&st);
4008 }
4009
4010 return JNI_OK;
4011 }
4012
4013 jint Arguments::apply_ergo() {
4014 // Set flags based on ergonomics.
4015 jint result = set_ergonomics_flags();
4016 if (result != JNI_OK) return result;
4017
4018 // Set heap size based on available physical memory
4019 set_heap_size();
4020
4021 GCConfig::arguments()->initialize();
4022
4023 result = set_shared_spaces_flags_and_archive_paths();
4024 if (result != JNI_OK) return result;
4025
4026 // Initialize Metaspace flags and alignments
4027 Metaspace::ergo_initialize();
4028
4029 if (!StringDedup::ergo_initialize()) {
4030 return JNI_EINVAL;
4031 }
4032
4033 // Set compiler flags after GC is selected and GC specific
4034 // flags (LoopStripMiningIter) are set.
4035 CompilerConfig::ergo_initialize();
4036
4037 // Set bytecode rewriting flags
4038 set_bytecode_flags();
4039
4040 // Set flags if aggressive optimization flags are enabled
4041 jint code = set_aggressive_opts_flags();
4042 if (code != JNI_OK) {
4043 return code;
4044 }
4045
4046 #ifdef ZERO
4047 // Clear flags not supported on zero.
4048 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4049
4050 if (LogTouchedMethods) {
4051 warning("LogTouchedMethods is not supported for Zero");
4052 FLAG_SET_DEFAULT(LogTouchedMethods, false);
4053 }
4054 #endif // ZERO
4055
4056 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4057 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4058 DebugNonSafepoints = true;
4059 }
4060
4061 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4062 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4063 }
4064
4065 // Treat the odd case where local verification is enabled but remote
4066 // verification is not as if both were enabled.
4067 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4068 log_info(verification)("Turning on remote verification because local verification is on");
4069 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4070 }
4071
4072 #ifndef PRODUCT
4073 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4074 if (use_vm_log()) {
4075 LogVMOutput = true;
4076 }
4077 }
4078 #endif // PRODUCT
4079
4080 if (PrintCommandLineFlags) {
4081 JVMFlag::printSetFlags(tty);
4082 }
4083
4084 #ifdef COMPILER2
4085 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4086 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4087 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4088 }
4089 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4090
4091 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4092 if (!EnableVectorReboxing) {
4093 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4094 } else {
4095 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4096 }
4097 }
4098 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4099
4100 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4101 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4102 }
4103 FLAG_SET_DEFAULT(UseVectorStubs, false);
4104 }
4105 #endif // COMPILER2
4106
4107 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4108 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4109 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4110 }
4111 }
4112 return JNI_OK;
4113 }
4114
4115 jint Arguments::adjust_after_os() {
4116 if (UseNUMA) {
4117 if (UseParallelGC) {
4118 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4119 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4120 }
4121 }
4122 }
4123 return JNI_OK;
4124 }
4125
4126 int Arguments::PropertyList_count(SystemProperty* pl) {
4127 int count = 0;
4128 while(pl != NULL) {
4129 count++;
4130 pl = pl->next();
4131 }
4132 return count;
4133 }
4134
4135 // Return the number of readable properties.
4136 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4137 int count = 0;
4138 while(pl != NULL) {
4139 if (pl->is_readable()) {
4140 count++;
4141 }
4142 pl = pl->next();
4143 }
4144 return count;
4145 }
4146
4147 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4148 assert(key != NULL, "just checking");
4149 SystemProperty* prop;
4150 for (prop = pl; prop != NULL; prop = prop->next()) {
4151 if (strcmp(key, prop->key()) == 0) return prop->value();
4152 }
4153 return NULL;
4154 }
4155
4156 // Return the value of the requested property provided that it is a readable property.
4157 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4158 assert(key != NULL, "just checking");
4159 SystemProperty* prop;
4160 // Return the property value if the keys match and the property is not internal or
4161 // it's the special internal property "jdk.boot.class.path.append".
4162 for (prop = pl; prop != NULL; prop = prop->next()) {
4163 if (strcmp(key, prop->key()) == 0) {
4164 if (!prop->internal()) {
4165 return prop->value();
4166 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4167 return prop->value();
4168 } else {
4169 // Property is internal and not jdk.boot.class.path.append so return NULL.
4170 return NULL;
4171 }
4172 }
4173 }
4174 return NULL;
4175 }
4176
4177 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4178 int count = 0;
4179 const char* ret_val = NULL;
4180
4181 while(pl != NULL) {
4182 if(count >= index) {
4183 ret_val = pl->key();
4184 break;
4185 }
4186 count++;
4187 pl = pl->next();
4188 }
4189
4190 return ret_val;
4191 }
4192
4193 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4194 int count = 0;
4195 char* ret_val = NULL;
4196
4197 while(pl != NULL) {
4198 if(count >= index) {
4199 ret_val = pl->value();
4200 break;
4201 }
4202 count++;
4203 pl = pl->next();
4204 }
4205
4206 return ret_val;
4207 }
4208
4209 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4210 SystemProperty* p = *plist;
4211 if (p == NULL) {
4212 *plist = new_p;
4213 } else {
4214 while (p->next() != NULL) {
4215 p = p->next();
4216 }
4217 p->set_next(new_p);
4218 }
4219 }
4220
4221 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4222 bool writeable, bool internal) {
4223 if (plist == NULL)
4224 return;
4225
4226 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4227 PropertyList_add(plist, new_p);
4228 }
4229
4230 void Arguments::PropertyList_add(SystemProperty *element) {
4231 PropertyList_add(&_system_properties, element);
4232 }
4233
4234 // This add maintains unique property key in the list.
4235 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4236 PropertyAppendable append, PropertyWriteable writeable,
4237 PropertyInternal internal) {
4238 if (plist == NULL)
4239 return;
4240
4241 // If property key exists and is writeable, then update with new value.
4242 // Trying to update a non-writeable property is silently ignored.
4243 SystemProperty* prop;
4244 for (prop = *plist; prop != NULL; prop = prop->next()) {
4245 if (strcmp(k, prop->key()) == 0) {
4246 if (append == AppendProperty) {
4247 prop->append_writeable_value(v);
4248 } else {
4249 prop->set_writeable_value(v);
4250 }
4251 return;
4252 }
4253 }
4254
4255 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4256 }
4257
4258 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4259 // Returns true if all of the source pointed by src has been copied over to
4260 // the destination buffer pointed by buf. Otherwise, returns false.
4261 // Notes:
4262 // 1. If the length (buflen) of the destination buffer excluding the
4263 // NULL terminator character is not long enough for holding the expanded
4264 // pid characters, it also returns false instead of returning the partially
4265 // expanded one.
4266 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4267 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4268 char* buf, size_t buflen) {
4269 const char* p = src;
4270 char* b = buf;
4271 const char* src_end = &src[srclen];
4272 char* buf_end = &buf[buflen - 1];
4273
4274 while (p < src_end && b < buf_end) {
4275 if (*p == '%') {
4276 switch (*(++p)) {
4277 case '%': // "%%" ==> "%"
4278 *b++ = *p++;
4279 break;
4280 case 'p': { // "%p" ==> current process id
4281 // buf_end points to the character before the last character so
4282 // that we could write '\0' to the end of the buffer.
4283 size_t buf_sz = buf_end - b + 1;
4284 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4285
4286 // if jio_snprintf fails or the buffer is not long enough to hold
4287 // the expanded pid, returns false.
4288 if (ret < 0 || ret >= (int)buf_sz) {
4289 return false;
4290 } else {
4291 b += ret;
4292 assert(*b == '\0', "fail in copy_expand_pid");
4293 if (p == src_end && b == buf_end + 1) {
4294 // reach the end of the buffer.
4295 return true;
4296 }
4297 }
4298 p++;
4299 break;
4300 }
4301 default :
4302 *b++ = '%';
4303 }
4304 } else {
4305 *b++ = *p++;
4306 }
4307 }
4308 *b = '\0';
4309 return (p == src_end); // return false if not all of the source was copied
4310 }