1 /*
2 * Copyright (c) 1997, 2019, 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 "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "logging/logStream.hpp"
37 #include "logging/logTag.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/flags/jvmFlagConstraintList.hpp"
45 #include "runtime/flags/jvmFlagWriteableList.hpp"
46 #include "runtime/flags/jvmFlagRangeList.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.inline.hpp"
50 #include "runtime/safepoint.hpp"
51 #include "runtime/safepointMechanism.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/align.hpp"
56 #include "utilities/defaultStream.hpp"
57 #include "utilities/macros.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JFR
60 #include "jfr/jfr.hpp"
61 #endif
62
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 char* Arguments::_jvm_flags_file = NULL;
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 size_t Arguments::_conservative_max_heap_alignment = 0;
74 Arguments::Mode Arguments::_mode = _mixed;
75 bool Arguments::_java_compiler = false;
76 bool Arguments::_xdebug_mode = false;
77 const char* Arguments::_java_vendor_url_bug = NULL;
78 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
79 bool Arguments::_sun_java_launcher_is_altjvm = false;
80
81 // These parameters are reset in method parse_vm_init_args()
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
87 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
88 size_t Arguments::_SharedBaseAddress = SharedBaseAddress;
89
90 bool Arguments::_enable_preview = false;
91
92 char* Arguments::SharedArchivePath = NULL;
93 char* Arguments::SharedDynamicArchivePath = NULL;
94
95 AgentLibraryList Arguments::_libraryList;
96 AgentLibraryList Arguments::_agentList;
97
98 // These are not set by the JDK's built-in launchers, but they can be set by
99 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
100 // JavaVMOption in jni.h.
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
111 SystemProperty *Arguments::_vm_info = NULL;
112
113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
114 PathString *Arguments::_system_boot_class_path = NULL;
115 bool Arguments::_has_jimage = false;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 bool PathString::set_value(const char *value) {
120 if (_value != NULL) {
121 FreeHeap(_value);
122 }
123 _value = AllocateHeap(strlen(value)+1, mtArguments);
124 assert(_value != NULL, "Unable to allocate space for new path value");
125 if (_value != NULL) {
126 strcpy(_value, value);
127 } else {
128 // not able to allocate
129 return false;
130 }
131 return true;
132 }
133
134 void PathString::append_value(const char *value) {
135 char *sp;
136 size_t len = 0;
137 if (value != NULL) {
138 len = strlen(value);
139 if (_value != NULL) {
140 len += strlen(_value);
141 }
142 sp = AllocateHeap(len+2, mtArguments);
143 assert(sp != NULL, "Unable to allocate space for new append path value");
144 if (sp != NULL) {
145 if (_value != NULL) {
146 strcpy(sp, _value);
147 strcat(sp, os::path_separator());
148 strcat(sp, value);
149 FreeHeap(_value);
150 } else {
151 strcpy(sp, value);
152 }
153 _value = sp;
154 }
155 }
156 }
157
158 PathString::PathString(const char* value) {
159 if (value == NULL) {
160 _value = NULL;
161 } else {
162 _value = AllocateHeap(strlen(value)+1, mtArguments);
163 strcpy(_value, value);
164 }
165 }
166
167 PathString::~PathString() {
168 if (_value != NULL) {
169 FreeHeap(_value);
170 _value = NULL;
171 }
172 }
173
174 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
175 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
176 size_t len = strlen(module_name) + 1;
177 _module_name = AllocateHeap(len, mtInternal);
178 strncpy(_module_name, module_name, len); // copy the trailing null
179 _path = new PathString(path);
180 }
181
182 ModulePatchPath::~ModulePatchPath() {
183 if (_module_name != NULL) {
184 FreeHeap(_module_name);
185 _module_name = NULL;
186 }
187 if (_path != NULL) {
188 delete _path;
189 _path = NULL;
190 }
191 }
192
193 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
194 if (key == NULL) {
195 _key = NULL;
196 } else {
197 _key = AllocateHeap(strlen(key)+1, mtArguments);
198 strcpy(_key, key);
199 }
200 _next = NULL;
201 _internal = internal;
202 _writeable = writeable;
203 }
204
205 AgentLibrary::AgentLibrary(const char* name, const char* options,
206 bool is_absolute_path, void* os_lib,
207 bool instrument_lib) {
208 _name = AllocateHeap(strlen(name)+1, mtArguments);
209 strcpy(_name, name);
210 if (options == NULL) {
211 _options = NULL;
212 } else {
213 _options = AllocateHeap(strlen(options)+1, mtArguments);
214 strcpy(_options, options);
215 }
216 _is_absolute_path = is_absolute_path;
217 _os_lib = os_lib;
218 _next = NULL;
219 _state = agent_invalid;
220 _is_static_lib = false;
221 _is_instrument_lib = instrument_lib;
222 }
223
224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
225 // part of the option string.
226 static bool match_option(const JavaVMOption *option, const char* name,
227 const char** tail) {
228 size_t len = strlen(name);
229 if (strncmp(option->optionString, name, len) == 0) {
230 *tail = option->optionString + len;
231 return true;
232 } else {
233 return false;
234 }
235 }
236
237 // Check if 'option' matches 'name'. No "tail" is allowed.
238 static bool match_option(const JavaVMOption *option, const char* name) {
239 const char* tail = NULL;
240 bool result = match_option(option, name, &tail);
241 if (tail != NULL && *tail == '\0') {
242 return result;
243 } else {
244 return false;
245 }
246 }
247
248 // Return true if any of the strings in null-terminated array 'names' matches.
249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
250 // the option must match exactly.
251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
252 bool tail_allowed) {
253 for (/* empty */; *names != NULL; ++names) {
254 if (match_option(option, *names, tail)) {
255 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
256 return true;
257 }
258 }
259 }
260 return false;
261 }
262
263 #if INCLUDE_JFR
264 static bool _has_jfr_option = false; // is using JFR
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != NULL, "invariant");
269 char* tail = NULL;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_start_flight_recording_option(option, tail);
273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_flight_recorder_option(option, tail);
276 }
277 return false;
278 }
279
280 bool Arguments::has_jfr_option() {
281 return _has_jfr_option;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
330 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
331 return ((strncmp(option, property, len) == 0) &&
332 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
333 }
334
335 // Return true if property starts with "jdk.module." and its ensuing chars match
336 // any of the reserved module properties.
337 // property should be passed without the leading "-D".
338 bool Arguments::is_internal_module_property(const char* property) {
339 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
340 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
341 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
342 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
343 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
344 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
345 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
346 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
348 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
349 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
350 return true;
351 }
352 }
353 return false;
354 }
355
356 // Process java launcher properties.
357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
359 // Must do this before setting up other system properties,
360 // as some of them may depend on launcher type.
361 for (int index = 0; index < args->nOptions; index++) {
362 const JavaVMOption* option = args->options + index;
363 const char* tail;
364
365 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
366 process_java_launcher_argument(tail, option->extraInfo);
367 continue;
368 }
369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
370 if (strcmp(tail, "true") == 0) {
371 _sun_java_launcher_is_altjvm = true;
372 }
373 continue;
374 }
375 }
376 }
377
378 // Initialize system properties key and value.
379 void Arguments::init_system_properties() {
380
381 // Set up _system_boot_class_path which is not a property but
382 // relies heavily on argument processing and the jdk.boot.class.path.append
383 // property. It is used to store the underlying system boot class path.
384 _system_boot_class_path = new PathString(NULL);
385
386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
387 "Java Virtual Machine Specification", false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
391
392 // Initialize the vm.info now, but it will need updating after argument parsing.
393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to NULL and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
399 _java_library_path = new SystemProperty("java.library.path", NULL, true);
400 _java_home = new SystemProperty("java.home", NULL, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414 PropertyList_add(&_system_properties, _vm_info);
415
416 // Set OS specific system properties values
417 os::init_system_properties_values();
418 }
419
420 // Update/Initialize System properties after JDK version number is known
421 void Arguments::init_version_specific_system_properties() {
422 enum { bufsz = 16 };
423 char buffer[bufsz];
424 const char* spec_vendor = "Oracle Corporation";
425 uint32_t spec_version = JDK_Version::current().major_version();
426
427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
428
429 PropertyList_add(&_system_properties,
430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.version", buffer, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
435 }
436
437 /*
438 * -XX argument processing:
439 *
440 * -XX arguments are defined in several places, such as:
441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
442 * -XX arguments are parsed in parse_argument().
443 * -XX argument bounds checking is done in check_vm_args_consistency().
444 *
445 * Over time -XX arguments may change. There are mechanisms to handle common cases:
446 *
447 * ALIASED: An option that is simply another name for another option. This is often
448 * part of the process of deprecating a flag, but not all aliases need
449 * to be deprecated.
450 *
451 * Create an alias for an option by adding the old and new option names to the
452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
453 *
454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
455 * support may be removed in the future. Both regular and aliased options may be
456 * deprecated.
457 *
458 * Add a deprecation warning for an option (or alias) by adding an entry in the
459 * "special_jvm_flags" table and setting the "deprecated_in" field.
460 * Often an option "deprecated" in one major release will
461 * be made "obsolete" in the next. In this case the entry should also have its
462 * "obsolete_in" field set.
463 *
464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
465 * on the command line. A warning is printed to let the user know that option might not
466 * be accepted in the future.
467 *
468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
469 * table and setting the "obsolete_in" field.
470 *
471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
472 * to the current JDK version. The system will flatly refuse to admit the existence of
473 * the flag. This allows a flag to die automatically over JDK releases.
474 *
475 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
477 * - Newly obsolete or expired deprecated options should have their global variable
478 * definitions removed (from globals.hpp, etc) and related implementations removed.
479 *
480 * Recommended approach for removing options:
481 *
482 * To remove options commonly used by customers (e.g. product -XX options), use
483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
484 *
485 * To remove internal options (e.g. diagnostic, experimental, develop options), use
486 * a 2-step model adding major release numbers to the obsolete and expire columns.
487 *
488 * To change the name of an option, use the alias table as well as a 2-step
489 * model adding major release numbers to the deprecate and expire columns.
490 * Think twice about aliasing commonly used customer options.
491 *
492 * There are times when it is appropriate to leave a future release number as undefined.
493 *
494 * Tests: Aliases should be tested in VMAliasOptions.java.
495 * Deprecated options should be tested in VMDeprecatedOptions.java.
496 */
497
498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
501 // the command-line as usual, but will issue a warning.
502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
503 // the command-line, while issuing a warning and ignoring the flag value.
504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
505 // existence of the flag.
506 //
507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
508 // This table ensures that the handling of options will update automatically when the JDK
509 // version is incremented, but the source code needs to be cleanup up manually:
510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
511 // variable should be removed, as well as users of the variable.
512 // - As "deprecated" options age into "obsolete" options, move the entry into the
513 // "Obsolete Flags" section of the table.
514 // - All expired options should be removed from the table.
515 static SpecialFlag const special_jvm_flags[] = {
516 // -------------- Deprecated Flags --------------
517 // --- Non-alias flags - sorted by obsolete_in then expired_in:
518 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
523 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
526 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
527 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
528 { "G1RSetScanBlockSize", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
529 { "UseParallelOldGC", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
530
531 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
532 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
535
536 // -------------- Obsolete Flags - sorted by expired_in --------------
537 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
538 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
539 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
540 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
541 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
542 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
543 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
544 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
545 { "GCTaskTimeStampEntries", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
546
547 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
548 // These entries will generate build errors. Their purpose is to test the macros.
549 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
550 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
551 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
552 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
553 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
554 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
555 #endif
556
557 { NULL, JDK_Version(0), JDK_Version(0) }
558 };
559
560 // Flags that are aliases for other flags.
561 typedef struct {
562 const char* alias_name;
563 const char* real_name;
564 } AliasedFlag;
565
566 static AliasedFlag const aliased_jvm_flags[] = {
567 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
568 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
569 { NULL, NULL}
570 };
571
572 // NOTE: A compatibility request will be necessary for each alias to be removed.
573 static AliasedLoggingFlag const aliased_logging_flags[] = {
574 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
575 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
576 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
577 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
578 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
579 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
580 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
581 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
582 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
583 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
584 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
585 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
586 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
587 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
588 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
589 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
590 };
591
592 #ifndef PRODUCT
593 // These options are removed in jdk9. Remove this code for jdk10.
594 static AliasedFlag const removed_develop_logging_flags[] = {
595 { "TraceClassInitialization", "-Xlog:class+init" },
596 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
597 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
598 { "TraceItables", "-Xlog:itables=debug" },
599 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
600 { "TraceSafepoint", "-Xlog:safepoint=debug" },
601 { "TraceStartupTime", "-Xlog:startuptime" },
602 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
603 { "PrintVtables", "-Xlog:vtables=debug" },
604 { "VerboseVerification", "-Xlog:verification" },
605 { NULL, NULL }
606 };
607 #endif //PRODUCT
608
609 // Return true if "v" is less than "other", where "other" may be "undefined".
610 static bool version_less_than(JDK_Version v, JDK_Version other) {
611 assert(!v.is_undefined(), "must be defined");
612 if (!other.is_undefined() && v.compare(other) >= 0) {
613 return false;
614 } else {
615 return true;
616 }
617 }
618
619 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
620 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
621 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
622 flag = special_jvm_flags[i];
623 return true;
624 }
625 }
626 return false;
627 }
628
629 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
630 assert(version != NULL, "Must provide a version buffer");
631 SpecialFlag flag;
632 if (lookup_special_flag(flag_name, flag)) {
633 if (!flag.obsolete_in.is_undefined()) {
634 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
635 *version = flag.obsolete_in;
636 return true;
637 }
638 }
639 }
640 return false;
641 }
642
643 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
644 assert(version != NULL, "Must provide a version buffer");
645 SpecialFlag flag;
646 if (lookup_special_flag(flag_name, flag)) {
647 if (!flag.deprecated_in.is_undefined()) {
648 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
649 version_less_than(JDK_Version::current(), flag.expired_in)) {
650 *version = flag.deprecated_in;
651 return 1;
652 } else {
653 return -1;
654 }
655 }
656 }
657 return 0;
658 }
659
660 #ifndef PRODUCT
661 const char* Arguments::removed_develop_logging_flag_name(const char* name){
662 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
663 const AliasedFlag& flag = removed_develop_logging_flags[i];
664 if (strcmp(flag.alias_name, name) == 0) {
665 return flag.real_name;
666 }
667 }
668 return NULL;
669 }
670 #endif // PRODUCT
671
672 const char* Arguments::real_flag_name(const char *flag_name) {
673 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
674 const AliasedFlag& flag_status = aliased_jvm_flags[i];
675 if (strcmp(flag_status.alias_name, flag_name) == 0) {
676 return flag_status.real_name;
677 }
678 }
679 return flag_name;
680 }
681
682 #ifdef ASSERT
683 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
684 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
685 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
686 return true;
687 }
688 }
689 return false;
690 }
691
692 // Verifies the correctness of the entries in the special_jvm_flags table.
693 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
694 // version being earlier than the deprecation version, then a warning is issued
695 // and verification fails - by returning false. If it is detected that the table
696 // is out of date, with respect to the current version, then a warning is issued
697 // but verification does not fail. This allows the VM to operate when the version
698 // is first updated, without needing to update all the impacted flags at the
699 // same time.
700 static bool verify_special_jvm_flags() {
701 bool success = true;
702 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
703 const SpecialFlag& flag = special_jvm_flags[i];
704 if (lookup_special_flag(flag.name, i)) {
705 warning("Duplicate special flag declaration \"%s\"", flag.name);
706 success = false;
707 }
708 if (flag.deprecated_in.is_undefined() &&
709 flag.obsolete_in.is_undefined()) {
710 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
711 success = false;
712 }
713
714 if (!flag.deprecated_in.is_undefined()) {
715 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
716 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
717 success = false;
718 }
719
720 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
721 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
722 success = false;
723 }
724 }
725
726 if (!flag.obsolete_in.is_undefined()) {
727 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
728 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
729 success = false;
730 }
731
732 // if flag has become obsolete it should not have a "globals" flag defined anymore.
733 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
734 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
735 // Temporarily disable the warning: 8196739
736 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
737 }
738 }
739 }
740
741 if (!flag.expired_in.is_undefined()) {
742 // if flag has become expired it should not have a "globals" flag defined anymore.
743 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
744 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
745 // Temporarily disable the warning: 8196739
746 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
747 }
748 }
749 }
750
751 }
752 return success;
753 }
754 #endif
755
756 // Parses a size specification string.
757 bool Arguments::atojulong(const char *s, julong* result) {
758 julong n = 0;
759
760 // First char must be a digit. Don't allow negative numbers or leading spaces.
761 if (!isdigit(*s)) {
762 return false;
763 }
764
765 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
766 char* remainder;
767 errno = 0;
768 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
769 if (errno != 0) {
770 return false;
771 }
772
773 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
774 if (remainder == s || strlen(remainder) > 1) {
775 return false;
776 }
777
778 switch (*remainder) {
779 case 'T': case 't':
780 *result = n * G * K;
781 // Check for overflow.
782 if (*result/((julong)G * K) != n) return false;
783 return true;
784 case 'G': case 'g':
785 *result = n * G;
786 if (*result/G != n) return false;
787 return true;
788 case 'M': case 'm':
789 *result = n * M;
790 if (*result/M != n) return false;
791 return true;
792 case 'K': case 'k':
793 *result = n * K;
794 if (*result/K != n) return false;
795 return true;
796 case '\0':
797 *result = n;
798 return true;
799 default:
800 return false;
801 }
802 }
803
804 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
805 if (size < min_size) return arg_too_small;
806 if (size > max_size) return arg_too_big;
807 return arg_in_range;
808 }
809
810 // Describe an argument out of range error
811 void Arguments::describe_range_error(ArgsRange errcode) {
812 switch(errcode) {
813 case arg_too_big:
814 jio_fprintf(defaultStream::error_stream(),
815 "The specified size exceeds the maximum "
816 "representable size.\n");
817 break;
818 case arg_too_small:
819 case arg_unreadable:
820 case arg_in_range:
821 // do nothing for now
822 break;
823 default:
824 ShouldNotReachHere();
825 }
826 }
827
828 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
829 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
830 return true;
831 } else {
832 return false;
833 }
834 }
835
836 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
837 char* end;
838 errno = 0;
839 double v = strtod(value, &end);
840 if ((errno != 0) || (*end != 0)) {
841 return false;
842 }
843
844 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
845 return true;
846 }
847 return false;
848 }
849
850 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
851 julong v;
852 int int_v;
853 intx intx_v;
854 bool is_neg = false;
855
856 if (flag == NULL) {
857 return false;
858 }
859
860 // Check the sign first since atojulong() parses only unsigned values.
861 if (*value == '-') {
862 if (!flag->is_intx() && !flag->is_int()) {
863 return false;
864 }
865 value++;
866 is_neg = true;
867 }
868 if (!Arguments::atojulong(value, &v)) {
869 return false;
870 }
871 if (flag->is_int()) {
872 int_v = (int) v;
873 if (is_neg) {
874 int_v = -int_v;
875 }
876 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
877 } else if (flag->is_uint()) {
878 uint uint_v = (uint) v;
879 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
880 } else if (flag->is_intx()) {
881 intx_v = (intx) v;
882 if (is_neg) {
883 intx_v = -intx_v;
884 }
885 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
886 } else if (flag->is_uintx()) {
887 uintx uintx_v = (uintx) v;
888 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
889 } else if (flag->is_uint64_t()) {
890 uint64_t uint64_t_v = (uint64_t) v;
891 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
892 } else if (flag->is_size_t()) {
893 size_t size_t_v = (size_t) v;
894 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
895 } else if (flag->is_double()) {
896 double double_v = (double) v;
897 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
898 } else {
899 return false;
900 }
901 }
902
903 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
904 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
905 // Contract: JVMFlag always returns a pointer that needs freeing.
906 FREE_C_HEAP_ARRAY(char, value);
907 return true;
908 }
909
910 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
911 const char* old_value = "";
912 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
913 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
914 size_t new_len = strlen(new_value);
915 const char* value;
916 char* free_this_too = NULL;
917 if (old_len == 0) {
918 value = new_value;
919 } else if (new_len == 0) {
920 value = old_value;
921 } else {
922 size_t length = old_len + 1 + new_len + 1;
923 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
924 // each new setting adds another LINE to the switch:
925 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
926 value = buf;
927 free_this_too = buf;
928 }
929 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
930 // JVMFlag always returns a pointer that needs freeing.
931 FREE_C_HEAP_ARRAY(char, value);
932 // JVMFlag made its own copy, so I must delete my own temp. buffer.
933 FREE_C_HEAP_ARRAY(char, free_this_too);
934 return true;
935 }
936
937 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
938 const char* real_name = real_flag_name(arg);
939 JDK_Version since = JDK_Version();
940 switch (is_deprecated_flag(arg, &since)) {
941 case -1:
942 return NULL; // obsolete or expired, don't process normally
943 case 0:
944 return real_name;
945 case 1: {
946 if (warn) {
947 char version[256];
948 since.to_string(version, sizeof(version));
949 if (real_name != arg) {
950 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
951 arg, version, real_name);
952 } else {
953 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
954 arg, version);
955 }
956 }
957 return real_name;
958 }
959 }
960 ShouldNotReachHere();
961 return NULL;
962 }
963
964 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
965 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
966 // Set tagset string buffer at max size of 256, large enough for any alias tagset
967 const int max_tagset_size = 256;
968 int max_tagset_len = max_tagset_size - 1;
969 char tagset_buffer[max_tagset_size];
970 tagset_buffer[0] = '\0';
971
972 // Write tag-set for aliased logging option, in string list form
973 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
974 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
975 if (i > 0) {
976 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
977 }
978 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
979 }
980 if (!alf.exactMatch) {
981 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
982 }
983 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
984 (on) ? "+" : "-",
985 name,
986 tagset_buffer,
987 (on) ? LogLevel::name(alf.level) : "off");
988 }
989
990 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
991 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
992 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
993 if (strcmp(alf.alias_name, name) == 0) {
994 log_deprecated_flag(name, on, alf);
995 return alf;
996 }
997 }
998 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
999 return a;
1000 }
1001
1002 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1003
1004 // range of acceptable characters spelled out for portability reasons
1005 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1006 #define BUFLEN 255
1007 char name[BUFLEN+1];
1008 char dummy;
1009 const char* real_name;
1010 bool warn_if_deprecated = true;
1011
1012 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1013 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1014 if (alf.alias_name != NULL){
1015 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1016 return true;
1017 }
1018 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1019 if (real_name == NULL) {
1020 return false;
1021 }
1022 JVMFlag* flag = JVMFlag::find_flag(real_name);
1023 return set_bool_flag(flag, false, origin);
1024 }
1025 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1026 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1027 if (alf.alias_name != NULL){
1028 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1029 return true;
1030 }
1031 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1032 if (real_name == NULL) {
1033 return false;
1034 }
1035 JVMFlag* flag = JVMFlag::find_flag(real_name);
1036 return set_bool_flag(flag, true, origin);
1037 }
1038
1039 char punct;
1040 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1041 const char* value = strchr(arg, '=') + 1;
1042
1043 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1044 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1045 if (alf.alias_name != NULL) {
1046 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1047 return true;
1048 }
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 if (flag != NULL && flag->is_ccstr()) {
1055 if (flag->ccstr_accumulates()) {
1056 return append_to_string_flag(flag, value, origin);
1057 } else {
1058 if (value[0] == '\0') {
1059 value = NULL;
1060 }
1061 return set_string_flag(flag, value, origin);
1062 }
1063 } else {
1064 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1065 }
1066 }
1067
1068 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1069 const char* value = strchr(arg, '=') + 1;
1070 // -XX:Foo:=xxx will reset the string flag to the given value.
1071 if (value[0] == '\0') {
1072 value = NULL;
1073 }
1074 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1075 if (real_name == NULL) {
1076 return false;
1077 }
1078 JVMFlag* flag = JVMFlag::find_flag(real_name);
1079 return set_string_flag(flag, value, origin);
1080 }
1081
1082 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1083 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1084 #define NUMBER_RANGE "[0123456789eE+-]"
1085 char value[BUFLEN + 1];
1086 char value2[BUFLEN + 1];
1087 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1088 // Looks like a floating-point number -- try again with more lenient format string
1089 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1090 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1091 if (real_name == NULL) {
1092 return false;
1093 }
1094 JVMFlag* flag = JVMFlag::find_flag(real_name);
1095 return set_fp_numeric_flag(flag, value, origin);
1096 }
1097 }
1098
1099 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1100 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1101 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1102 if (real_name == NULL) {
1103 return false;
1104 }
1105 JVMFlag* flag = JVMFlag::find_flag(real_name);
1106 return set_numeric_flag(flag, value, origin);
1107 }
1108
1109 return false;
1110 }
1111
1112 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1113 assert(bldarray != NULL, "illegal argument");
1114
1115 if (arg == NULL) {
1116 return;
1117 }
1118
1119 int new_count = *count + 1;
1120
1121 // expand the array and add arg to the last element
1122 if (*bldarray == NULL) {
1123 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1124 } else {
1125 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1126 }
1127 (*bldarray)[*count] = os::strdup_check_oom(arg);
1128 *count = new_count;
1129 }
1130
1131 void Arguments::build_jvm_args(const char* arg) {
1132 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1133 }
1134
1135 void Arguments::build_jvm_flags(const char* arg) {
1136 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1137 }
1138
1139 // utility function to return a string that concatenates all
1140 // strings in a given char** array
1141 const char* Arguments::build_resource_string(char** args, int count) {
1142 if (args == NULL || count == 0) {
1143 return NULL;
1144 }
1145 size_t length = 0;
1146 for (int i = 0; i < count; i++) {
1147 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1148 }
1149 char* s = NEW_RESOURCE_ARRAY(char, length);
1150 char* dst = s;
1151 for (int j = 0; j < count; j++) {
1152 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1153 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1154 dst += offset;
1155 length -= offset;
1156 }
1157 return (const char*) s;
1158 }
1159
1160 void Arguments::print_on(outputStream* st) {
1161 st->print_cr("VM Arguments:");
1162 if (num_jvm_flags() > 0) {
1163 st->print("jvm_flags: "); print_jvm_flags_on(st);
1164 st->cr();
1165 }
1166 if (num_jvm_args() > 0) {
1167 st->print("jvm_args: "); print_jvm_args_on(st);
1168 st->cr();
1169 }
1170 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1171 if (_java_class_path != NULL) {
1172 char* path = _java_class_path->value();
1173 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1174 }
1175 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1176 }
1177
1178 void Arguments::print_summary_on(outputStream* st) {
1179 // Print the command line. Environment variables that are helpful for
1180 // reproducing the problem are written later in the hs_err file.
1181 // flags are from setting file
1182 if (num_jvm_flags() > 0) {
1183 st->print_raw("Settings File: ");
1184 print_jvm_flags_on(st);
1185 st->cr();
1186 }
1187 // args are the command line and environment variable arguments.
1188 st->print_raw("Command Line: ");
1189 if (num_jvm_args() > 0) {
1190 print_jvm_args_on(st);
1191 }
1192 // this is the classfile and any arguments to the java program
1193 if (java_command() != NULL) {
1194 st->print("%s", java_command());
1195 }
1196 st->cr();
1197 }
1198
1199 void Arguments::print_jvm_flags_on(outputStream* st) {
1200 if (_num_jvm_flags > 0) {
1201 for (int i=0; i < _num_jvm_flags; i++) {
1202 st->print("%s ", _jvm_flags_array[i]);
1203 }
1204 }
1205 }
1206
1207 void Arguments::print_jvm_args_on(outputStream* st) {
1208 if (_num_jvm_args > 0) {
1209 for (int i=0; i < _num_jvm_args; i++) {
1210 st->print("%s ", _jvm_args_array[i]);
1211 }
1212 }
1213 }
1214
1215 bool Arguments::process_argument(const char* arg,
1216 jboolean ignore_unrecognized,
1217 JVMFlag::Flags origin) {
1218 JDK_Version since = JDK_Version();
1219
1220 if (parse_argument(arg, origin)) {
1221 return true;
1222 }
1223
1224 // Determine if the flag has '+', '-', or '=' characters.
1225 bool has_plus_minus = (*arg == '+' || *arg == '-');
1226 const char* const argname = has_plus_minus ? arg + 1 : arg;
1227
1228 size_t arg_len;
1229 const char* equal_sign = strchr(argname, '=');
1230 if (equal_sign == NULL) {
1231 arg_len = strlen(argname);
1232 } else {
1233 arg_len = equal_sign - argname;
1234 }
1235
1236 // Only make the obsolete check for valid arguments.
1237 if (arg_len <= BUFLEN) {
1238 // Construct a string which consists only of the argument name without '+', '-', or '='.
1239 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1240 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1241 if (is_obsolete_flag(stripped_argname, &since)) {
1242 char version[256];
1243 since.to_string(version, sizeof(version));
1244 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1245 return true;
1246 }
1247 #ifndef PRODUCT
1248 else {
1249 const char* replacement;
1250 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1251 log_warning(arguments)("%s has been removed. Please use %s instead.",
1252 stripped_argname,
1253 replacement);
1254 return false;
1255 }
1256 }
1257 #endif //PRODUCT
1258 }
1259
1260 // For locked flags, report a custom error message if available.
1261 // Otherwise, report the standard unrecognized VM option.
1262 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1263 if (found_flag != NULL) {
1264 char locked_message_buf[BUFLEN];
1265 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1266 if (strlen(locked_message_buf) == 0) {
1267 if (found_flag->is_bool() && !has_plus_minus) {
1268 jio_fprintf(defaultStream::error_stream(),
1269 "Missing +/- setting for VM option '%s'\n", argname);
1270 } else if (!found_flag->is_bool() && has_plus_minus) {
1271 jio_fprintf(defaultStream::error_stream(),
1272 "Unexpected +/- setting in VM option '%s'\n", argname);
1273 } else {
1274 jio_fprintf(defaultStream::error_stream(),
1275 "Improperly specified VM option '%s'\n", argname);
1276 }
1277 } else {
1278 #ifdef PRODUCT
1279 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1280 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1281 if (ignore_unrecognized && mismatched) {
1282 return true;
1283 }
1284 #endif
1285 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1286 }
1287 } else {
1288 if (ignore_unrecognized) {
1289 return true;
1290 }
1291 jio_fprintf(defaultStream::error_stream(),
1292 "Unrecognized VM option '%s'\n", argname);
1293 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1294 if (fuzzy_matched != NULL) {
1295 jio_fprintf(defaultStream::error_stream(),
1296 "Did you mean '%s%s%s'? ",
1297 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1298 fuzzy_matched->_name,
1299 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1300 }
1301 }
1302
1303 // allow for commandline "commenting out" options like -XX:#+Verbose
1304 return arg[0] == '#';
1305 }
1306
1307 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1308 FILE* stream = fopen(file_name, "rb");
1309 if (stream == NULL) {
1310 if (should_exist) {
1311 jio_fprintf(defaultStream::error_stream(),
1312 "Could not open settings file %s\n", file_name);
1313 return false;
1314 } else {
1315 return true;
1316 }
1317 }
1318
1319 char token[1024];
1320 int pos = 0;
1321
1322 bool in_white_space = true;
1323 bool in_comment = false;
1324 bool in_quote = false;
1325 char quote_c = 0;
1326 bool result = true;
1327
1328 int c = getc(stream);
1329 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1330 if (in_white_space) {
1331 if (in_comment) {
1332 if (c == '\n') in_comment = false;
1333 } else {
1334 if (c == '#') in_comment = true;
1335 else if (!isspace(c)) {
1336 in_white_space = false;
1337 token[pos++] = c;
1338 }
1339 }
1340 } else {
1341 if (c == '\n' || (!in_quote && isspace(c))) {
1342 // token ends at newline, or at unquoted whitespace
1343 // this allows a way to include spaces in string-valued options
1344 token[pos] = '\0';
1345 logOption(token);
1346 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1347 build_jvm_flags(token);
1348 pos = 0;
1349 in_white_space = true;
1350 in_quote = false;
1351 } else if (!in_quote && (c == '\'' || c == '"')) {
1352 in_quote = true;
1353 quote_c = c;
1354 } else if (in_quote && (c == quote_c)) {
1355 in_quote = false;
1356 } else {
1357 token[pos++] = c;
1358 }
1359 }
1360 c = getc(stream);
1361 }
1362 if (pos > 0) {
1363 token[pos] = '\0';
1364 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1365 build_jvm_flags(token);
1366 }
1367 fclose(stream);
1368 return result;
1369 }
1370
1371 //=============================================================================================================
1372 // Parsing of properties (-D)
1373
1374 const char* Arguments::get_property(const char* key) {
1375 return PropertyList_get_value(system_properties(), key);
1376 }
1377
1378 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1379 const char* eq = strchr(prop, '=');
1380 const char* key;
1381 const char* value = "";
1382
1383 if (eq == NULL) {
1384 // property doesn't have a value, thus use passed string
1385 key = prop;
1386 } else {
1387 // property have a value, thus extract it and save to the
1388 // allocated string
1389 size_t key_len = eq - prop;
1390 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1391
1392 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1393 key = tmp_key;
1394
1395 value = &prop[key_len + 1];
1396 }
1397
1398 if (strcmp(key, "java.compiler") == 0) {
1399 process_java_compiler_argument(value);
1400 // Record value in Arguments, but let it get passed to Java.
1401 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1402 // sun.java.launcher.is_altjvm property is
1403 // private and is processed in process_sun_java_launcher_properties();
1404 // the sun.java.launcher property is passed on to the java application
1405 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1406 // append is true, writable is true, internal is false
1407 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1408 WriteableProperty, ExternalProperty);
1409 } else {
1410 if (strcmp(key, "sun.java.command") == 0) {
1411 char *old_java_command = _java_command;
1412 _java_command = os::strdup_check_oom(value, mtArguments);
1413 if (old_java_command != NULL) {
1414 os::free(old_java_command);
1415 }
1416 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1417 // If this property is set on the command line then its value will be
1418 // displayed in VM error logs as the URL at which to submit such logs.
1419 // Normally the URL displayed in error logs is different from the value
1420 // of this system property, so a different property should have been
1421 // used here, but we leave this as-is in case someone depends upon it.
1422 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1423 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1424 // its value without going through the property list or making a Java call.
1425 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1426 if (old_java_vendor_url_bug != NULL) {
1427 os::free((void *)old_java_vendor_url_bug);
1428 }
1429 }
1430
1431 // Create new property and add at the end of the list
1432 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1433 }
1434
1435 if (key != prop) {
1436 // SystemProperty copy passed value, thus free previously allocated
1437 // memory
1438 FreeHeap((void *)key);
1439 }
1440
1441 return true;
1442 }
1443
1444 #if INCLUDE_CDS
1445 const char* unsupported_properties[] = { "jdk.module.limitmods",
1446 "jdk.module.upgrade.path",
1447 "jdk.module.patch.0" };
1448 const char* unsupported_options[] = { "--limit-modules",
1449 "--upgrade-module-path",
1450 "--patch-module"
1451 };
1452 void Arguments::check_unsupported_dumping_properties() {
1453 assert(is_dumping_archive(),
1454 "this function is only used with CDS dump time");
1455 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1456 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1457 SystemProperty* sp = system_properties();
1458 while (sp != NULL) {
1459 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1460 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1461 vm_exit_during_initialization(
1462 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1463 }
1464 }
1465 sp = sp->next();
1466 }
1467
1468 // Check for an exploded module build in use with -Xshare:dump.
1469 if (!has_jimage()) {
1470 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1471 }
1472 }
1473
1474 bool Arguments::check_unsupported_cds_runtime_properties() {
1475 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1476 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1477 if (ArchiveClassesAtExit != NULL) {
1478 // dynamic dumping, just return false for now.
1479 // check_unsupported_dumping_properties() will be called later to check the same set of
1480 // properties, and will exit the VM with the correct error message if the unsupported properties
1481 // are used.
1482 return false;
1483 }
1484 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1485 if (get_property(unsupported_properties[i]) != NULL) {
1486 if (RequireSharedSpaces) {
1487 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1488 }
1489 return true;
1490 }
1491 }
1492 return false;
1493 }
1494 #endif
1495
1496 //===========================================================================================================
1497 // Setting int/mixed/comp mode flags
1498
1499 void Arguments::set_mode_flags(Mode mode) {
1500 // Set up default values for all flags.
1501 // If you add a flag to any of the branches below,
1502 // add a default value for it here.
1503 set_java_compiler(false);
1504 _mode = mode;
1505
1506 // Ensure Agent_OnLoad has the correct initial values.
1507 // This may not be the final mode; mode may change later in onload phase.
1508 PropertyList_unique_add(&_system_properties, "java.vm.info",
1509 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1510
1511 UseInterpreter = true;
1512 UseCompiler = true;
1513 UseLoopCounter = true;
1514
1515 // Default values may be platform/compiler dependent -
1516 // use the saved values
1517 ClipInlining = Arguments::_ClipInlining;
1518 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1519 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1520 BackgroundCompilation = Arguments::_BackgroundCompilation;
1521 if (TieredCompilation) {
1522 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1523 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1524 }
1525 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1526 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1527 }
1528 }
1529
1530 // Change from defaults based on mode
1531 switch (mode) {
1532 default:
1533 ShouldNotReachHere();
1534 break;
1535 case _int:
1536 UseCompiler = false;
1537 UseLoopCounter = false;
1538 AlwaysCompileLoopMethods = false;
1539 UseOnStackReplacement = false;
1540 break;
1541 case _mixed:
1542 // same as default
1543 break;
1544 case _comp:
1545 UseInterpreter = false;
1546 BackgroundCompilation = false;
1547 ClipInlining = false;
1548 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1549 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1550 // compile a level 4 (C2) and then continue executing it.
1551 if (TieredCompilation) {
1552 Tier3InvokeNotifyFreqLog = 0;
1553 Tier4InvocationThreshold = 0;
1554 }
1555 break;
1556 }
1557 }
1558
1559 // Conflict: required to use shared spaces (-Xshare:on), but
1560 // incompatible command line options were chosen.
1561 static void no_shared_spaces(const char* message) {
1562 if (RequireSharedSpaces) {
1563 jio_fprintf(defaultStream::error_stream(),
1564 "Class data sharing is inconsistent with other specified options.\n");
1565 vm_exit_during_initialization("Unable to use shared archive", message);
1566 } else {
1567 log_info(cds)("Unable to use shared archive: %s", message);
1568 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1569 }
1570 }
1571
1572 void set_object_alignment() {
1573 // Object alignment.
1574 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1575 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1576 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1577 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1578 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1579 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1580
1581 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1582 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1583
1584 // Oop encoding heap max
1585 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1586
1587 if (SurvivorAlignmentInBytes == 0) {
1588 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1589 }
1590 }
1591
1592 size_t Arguments::max_heap_for_compressed_oops() {
1593 // Avoid sign flip.
1594 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1595 // We need to fit both the NULL page and the heap into the memory budget, while
1596 // keeping alignment constraints of the heap. To guarantee the latter, as the
1597 // NULL page is located before the heap, we pad the NULL page to the conservative
1598 // maximum alignment that the GC may ever impose upon the heap.
1599 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1600 _conservative_max_heap_alignment);
1601
1602 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1603 NOT_LP64(ShouldNotReachHere(); return 0);
1604 }
1605
1606 void Arguments::set_use_compressed_oops() {
1607 #ifndef ZERO
1608 #ifdef _LP64
1609 // MaxHeapSize is not set up properly at this point, but
1610 // the only value that can override MaxHeapSize if we are
1611 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1612 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1613
1614 if (max_heap_size <= max_heap_for_compressed_oops()) {
1615 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1616 FLAG_SET_ERGO(UseCompressedOops, true);
1617 }
1618 } else {
1619 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1620 warning("Max heap size too large for Compressed Oops");
1621 FLAG_SET_DEFAULT(UseCompressedOops, false);
1622 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1623 }
1624 }
1625 #endif // _LP64
1626 #endif // ZERO
1627 }
1628
1629
1630 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1631 // set_use_compressed_oops().
1632 void Arguments::set_use_compressed_klass_ptrs() {
1633 #ifndef ZERO
1634 #ifdef _LP64
1635 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1636 if (!UseCompressedOops) {
1637 if (UseCompressedClassPointers) {
1638 warning("UseCompressedClassPointers requires UseCompressedOops");
1639 }
1640 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1641 } else {
1642 // Turn on UseCompressedClassPointers too
1643 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1644 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1645 }
1646 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1647 if (UseCompressedClassPointers) {
1648 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1649 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1650 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1651 }
1652 }
1653 }
1654 #endif // _LP64
1655 #endif // !ZERO
1656 }
1657
1658 void Arguments::set_conservative_max_heap_alignment() {
1659 // The conservative maximum required alignment for the heap is the maximum of
1660 // the alignments imposed by several sources: any requirements from the heap
1661 // itself and the maximum page size we may run the VM with.
1662 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1663 _conservative_max_heap_alignment = MAX4(heap_alignment,
1664 (size_t)os::vm_allocation_granularity(),
1665 os::max_page_size(),
1666 GCArguments::compute_heap_alignment());
1667 }
1668
1669 jint Arguments::set_ergonomics_flags() {
1670 GCConfig::initialize();
1671
1672 set_conservative_max_heap_alignment();
1673
1674 #ifndef ZERO
1675 #ifdef _LP64
1676 set_use_compressed_oops();
1677
1678 // set_use_compressed_klass_ptrs() must be called after calling
1679 // set_use_compressed_oops().
1680 set_use_compressed_klass_ptrs();
1681
1682 // Also checks that certain machines are slower with compressed oops
1683 // in vm_version initialization code.
1684 #endif // _LP64
1685 #endif // !ZERO
1686
1687 return JNI_OK;
1688 }
1689
1690 julong Arguments::limit_by_allocatable_memory(julong limit) {
1691 julong max_allocatable;
1692 julong result = limit;
1693 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1694 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1695 }
1696 return result;
1697 }
1698
1699 // Use static initialization to get the default before parsing
1700 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1701
1702 void Arguments::set_heap_size() {
1703 julong phys_mem;
1704
1705 // If the user specified one of these options, they
1706 // want specific memory sizing so do not limit memory
1707 // based on compressed oops addressability.
1708 // Also, memory limits will be calculated based on
1709 // available os physical memory, not our MaxRAM limit,
1710 // unless MaxRAM is also specified.
1711 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1712 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1713 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1714 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1715 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1716 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1717 !FLAG_IS_DEFAULT(MaxRAM));
1718 if (override_coop_limit) {
1719 if (FLAG_IS_DEFAULT(MaxRAM)) {
1720 phys_mem = os::physical_memory();
1721 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1722 } else {
1723 phys_mem = (julong)MaxRAM;
1724 }
1725 } else {
1726 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1727 : (julong)MaxRAM;
1728 }
1729
1730
1731 // Convert deprecated flags
1732 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1733 !FLAG_IS_DEFAULT(MaxRAMFraction))
1734 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1735
1736 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1737 !FLAG_IS_DEFAULT(MinRAMFraction))
1738 MinRAMPercentage = 100.0 / MinRAMFraction;
1739
1740 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1741 !FLAG_IS_DEFAULT(InitialRAMFraction))
1742 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1743
1744 // If the maximum heap size has not been set with -Xmx,
1745 // then set it as fraction of the size of physical memory,
1746 // respecting the maximum and minimum sizes of the heap.
1747 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1748 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1749 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1750 if (reasonable_min < MaxHeapSize) {
1751 // Small physical memory, so use a minimum fraction of it for the heap
1752 reasonable_max = reasonable_min;
1753 } else {
1754 // Not-small physical memory, so require a heap at least
1755 // as large as MaxHeapSize
1756 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1757 }
1758
1759 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1760 // Limit the heap size to ErgoHeapSizeLimit
1761 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1762 }
1763
1764 #ifdef _LP64
1765 if (UseCompressedOops) {
1766 // Limit the heap size to the maximum possible when using compressed oops
1767 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1768
1769 // HeapBaseMinAddress can be greater than default but not less than.
1770 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1771 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1772 // matches compressed oops printing flags
1773 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1774 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1775 DefaultHeapBaseMinAddress,
1776 DefaultHeapBaseMinAddress/G,
1777 HeapBaseMinAddress);
1778 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1779 }
1780 }
1781
1782 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1783 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1784 // but it should be not less than default MaxHeapSize.
1785 max_coop_heap -= HeapBaseMinAddress;
1786 }
1787
1788 // If user specified flags prioritizing os physical
1789 // memory limits, then disable compressed oops if
1790 // limits exceed max_coop_heap and UseCompressedOops
1791 // was not specified.
1792 if (reasonable_max > max_coop_heap) {
1793 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1794 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1795 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1796 "Please check the setting of MaxRAMPercentage %5.2f."
1797 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1798 FLAG_SET_ERGO(UseCompressedOops, false);
1799 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1800 } else {
1801 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1802 }
1803 }
1804 }
1805 #endif // _LP64
1806
1807 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1808
1809 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1810 // An initial heap size was specified on the command line,
1811 // so be sure that the maximum size is consistent. Done
1812 // after call to limit_by_allocatable_memory because that
1813 // method might reduce the allocation size.
1814 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1815 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1816 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1817 }
1818
1819 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1820 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1821 }
1822
1823 // If the minimum or initial heap_size have not been set or requested to be set
1824 // ergonomically, set them accordingly.
1825 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1826 julong reasonable_minimum = (julong)(OldSize + NewSize);
1827
1828 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1829
1830 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1831
1832 if (InitialHeapSize == 0) {
1833 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1834
1835 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1836 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1837
1838 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1839
1840 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1841 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1842 }
1843 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1844 // synchronize with InitialHeapSize to avoid errors with the default value.
1845 if (MinHeapSize == 0) {
1846 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1847 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1848 }
1849 }
1850 }
1851
1852 // This option inspects the machine and attempts to set various
1853 // parameters to be optimal for long-running, memory allocation
1854 // intensive jobs. It is intended for machines with large
1855 // amounts of cpu and memory.
1856 jint Arguments::set_aggressive_heap_flags() {
1857 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1858 // VM, but we may not be able to represent the total physical memory
1859 // available (like having 8gb of memory on a box but using a 32bit VM).
1860 // Thus, we need to make sure we're using a julong for intermediate
1861 // calculations.
1862 julong initHeapSize;
1863 julong total_memory = os::physical_memory();
1864
1865 if (total_memory < (julong) 256 * M) {
1866 jio_fprintf(defaultStream::error_stream(),
1867 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1868 vm_exit(1);
1869 }
1870
1871 // The heap size is half of available memory, or (at most)
1872 // all of possible memory less 160mb (leaving room for the OS
1873 // when using ISM). This is the maximum; because adaptive sizing
1874 // is turned on below, the actual space used may be smaller.
1875
1876 initHeapSize = MIN2(total_memory / (julong) 2,
1877 total_memory - (julong) 160 * M);
1878
1879 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1880
1881 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1882 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1883 return JNI_EINVAL;
1884 }
1885 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1886 return JNI_EINVAL;
1887 }
1888 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1889 return JNI_EINVAL;
1890 }
1891 }
1892 if (FLAG_IS_DEFAULT(NewSize)) {
1893 // Make the young generation 3/8ths of the total heap.
1894 if (FLAG_SET_CMDLINE(NewSize,
1895 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1896 return JNI_EINVAL;
1897 }
1898 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1899 return JNI_EINVAL;
1900 }
1901 }
1902
1903 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1904 FLAG_SET_DEFAULT(UseLargePages, true);
1905 #endif
1906
1907 // Increase some data structure sizes for efficiency
1908 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1909 return JNI_EINVAL;
1910 }
1911 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1912 return JNI_EINVAL;
1913 }
1914 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1915 return JNI_EINVAL;
1916 }
1917
1918 // See the OldPLABSize comment below, but replace 'after promotion'
1919 // with 'after copying'. YoungPLABSize is the size of the survivor
1920 // space per-gc-thread buffers. The default is 4kw.
1921 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1922 return JNI_EINVAL;
1923 }
1924
1925 // OldPLABSize is the size of the buffers in the old gen that
1926 // UseParallelGC uses to promote live data that doesn't fit in the
1927 // survivor spaces. At any given time, there's one for each gc thread.
1928 // The default size is 1kw. These buffers are rarely used, since the
1929 // survivor spaces are usually big enough. For specjbb, however, there
1930 // are occasions when there's lots of live data in the young gen
1931 // and we end up promoting some of it. We don't have a definite
1932 // explanation for why bumping OldPLABSize helps, but the theory
1933 // is that a bigger PLAB results in retaining something like the
1934 // original allocation order after promotion, which improves mutator
1935 // locality. A minor effect may be that larger PLABs reduce the
1936 // number of PLAB allocation events during gc. The value of 8kw
1937 // was arrived at by experimenting with specjbb.
1938 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1939 return JNI_EINVAL;
1940 }
1941
1942 // Enable parallel GC and adaptive generation sizing
1943 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1944 return JNI_EINVAL;
1945 }
1946
1947 // Encourage steady state memory management
1948 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1949 return JNI_EINVAL;
1950 }
1951
1952 // This appears to improve mutator locality
1953 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1954 return JNI_EINVAL;
1955 }
1956
1957 return JNI_OK;
1958 }
1959
1960 // This must be called after ergonomics.
1961 void Arguments::set_bytecode_flags() {
1962 if (!RewriteBytecodes) {
1963 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1964 }
1965 }
1966
1967 // Aggressive optimization flags
1968 jint Arguments::set_aggressive_opts_flags() {
1969 #ifdef COMPILER2
1970 if (AggressiveUnboxing) {
1971 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1972 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1973 } else if (!EliminateAutoBox) {
1974 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1975 AggressiveUnboxing = false;
1976 }
1977 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1978 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1979 } else if (!DoEscapeAnalysis) {
1980 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1981 AggressiveUnboxing = false;
1982 }
1983 }
1984 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1985 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1986 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1987 }
1988 // Feed the cache size setting into the JDK
1989 char buffer[1024];
1990 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1991 if (!add_property(buffer)) {
1992 return JNI_ENOMEM;
1993 }
1994 }
1995 #endif
1996
1997 return JNI_OK;
1998 }
1999
2000 //===========================================================================================================
2001 // Parsing of java.compiler property
2002
2003 void Arguments::process_java_compiler_argument(const char* arg) {
2004 // For backwards compatibility, Djava.compiler=NONE or ""
2005 // causes us to switch to -Xint mode UNLESS -Xdebug
2006 // is also specified.
2007 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2008 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2009 }
2010 }
2011
2012 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2013 _sun_java_launcher = os::strdup_check_oom(launcher);
2014 }
2015
2016 bool Arguments::created_by_java_launcher() {
2017 assert(_sun_java_launcher != NULL, "property must have value");
2018 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2019 }
2020
2021 bool Arguments::sun_java_launcher_is_altjvm() {
2022 return _sun_java_launcher_is_altjvm;
2023 }
2024
2025 //===========================================================================================================
2026 // Parsing of main arguments
2027
2028 unsigned int addreads_count = 0;
2029 unsigned int addexports_count = 0;
2030 unsigned int addopens_count = 0;
2031 unsigned int addmods_count = 0;
2032 unsigned int patch_mod_count = 0;
2033
2034 // Check the consistency of vm_init_args
2035 bool Arguments::check_vm_args_consistency() {
2036 // Method for adding checks for flag consistency.
2037 // The intent is to warn the user of all possible conflicts,
2038 // before returning an error.
2039 // Note: Needs platform-dependent factoring.
2040 bool status = true;
2041
2042 if (TLABRefillWasteFraction == 0) {
2043 jio_fprintf(defaultStream::error_stream(),
2044 "TLABRefillWasteFraction should be a denominator, "
2045 "not " SIZE_FORMAT "\n",
2046 TLABRefillWasteFraction);
2047 status = false;
2048 }
2049
2050 if (PrintNMTStatistics) {
2051 #if INCLUDE_NMT
2052 if (MemTracker::tracking_level() == NMT_off) {
2053 #endif // INCLUDE_NMT
2054 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2055 PrintNMTStatistics = false;
2056 #if INCLUDE_NMT
2057 }
2058 #endif
2059 }
2060
2061 status = CompilerConfig::check_args_consistency(status);
2062 #if INCLUDE_JVMCI
2063 if (status && EnableJVMCI) {
2064 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2065 AddProperty, UnwriteableProperty, InternalProperty);
2066 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2067 return false;
2068 }
2069 }
2070 #endif
2071
2072 #ifndef SUPPORT_RESERVED_STACK_AREA
2073 if (StackReservedPages != 0) {
2074 FLAG_SET_CMDLINE(StackReservedPages, 0);
2075 warning("Reserved Stack Area not supported on this platform");
2076 }
2077 #endif
2078
2079 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2080 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2081 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2082 }
2083 }
2084
2085 status = status && GCArguments::check_args_consistency();
2086
2087 return status;
2088 }
2089
2090 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2091 const char* option_type) {
2092 if (ignore) return false;
2093
2094 const char* spacer = " ";
2095 if (option_type == NULL) {
2096 option_type = ++spacer; // Set both to the empty string.
2097 }
2098
2099 jio_fprintf(defaultStream::error_stream(),
2100 "Unrecognized %s%soption: %s\n", option_type, spacer,
2101 option->optionString);
2102 return true;
2103 }
2104
2105 static const char* user_assertion_options[] = {
2106 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2107 };
2108
2109 static const char* system_assertion_options[] = {
2110 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2111 };
2112
2113 bool Arguments::parse_uintx(const char* value,
2114 uintx* uintx_arg,
2115 uintx min_size) {
2116
2117 // Check the sign first since atojulong() parses only unsigned values.
2118 bool value_is_positive = !(*value == '-');
2119
2120 if (value_is_positive) {
2121 julong n;
2122 bool good_return = atojulong(value, &n);
2123 if (good_return) {
2124 bool above_minimum = n >= min_size;
2125 bool value_is_too_large = n > max_uintx;
2126
2127 if (above_minimum && !value_is_too_large) {
2128 *uintx_arg = n;
2129 return true;
2130 }
2131 }
2132 }
2133 return false;
2134 }
2135
2136 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2137 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2138 char* property = AllocateHeap(prop_len, mtArguments);
2139 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2140 if (ret < 0 || ret >= (int)prop_len) {
2141 FreeHeap(property);
2142 return false;
2143 }
2144 bool added = add_property(property, UnwriteableProperty, internal);
2145 FreeHeap(property);
2146 return added;
2147 }
2148
2149 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2150 const unsigned int props_count_limit = 1000;
2151 const int max_digits = 3;
2152 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2153
2154 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2155 if (count < props_count_limit) {
2156 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2157 char* property = AllocateHeap(prop_len, mtArguments);
2158 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2159 if (ret < 0 || ret >= (int)prop_len) {
2160 FreeHeap(property);
2161 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2162 return false;
2163 }
2164 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2165 FreeHeap(property);
2166 return added;
2167 }
2168
2169 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2170 return false;
2171 }
2172
2173 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2174 julong* long_arg,
2175 julong min_size,
2176 julong max_size) {
2177 if (!atojulong(s, long_arg)) return arg_unreadable;
2178 return check_memory_size(*long_arg, min_size, max_size);
2179 }
2180
2181 // Parse JavaVMInitArgs structure
2182
2183 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2184 const JavaVMInitArgs *java_tool_options_args,
2185 const JavaVMInitArgs *java_options_args,
2186 const JavaVMInitArgs *cmd_line_args) {
2187 bool patch_mod_javabase = false;
2188
2189 // Save default settings for some mode flags
2190 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2191 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2192 Arguments::_ClipInlining = ClipInlining;
2193 Arguments::_BackgroundCompilation = BackgroundCompilation;
2194 if (TieredCompilation) {
2195 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2196 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2197 }
2198
2199 // CDS dumping always write the archive to the default value of SharedBaseAddress.
2200 Arguments::_SharedBaseAddress = SharedBaseAddress;
2201
2202 // Setup flags for mixed which is the default
2203 set_mode_flags(_mixed);
2204
2205 // Parse args structure generated from java.base vm options resource
2206 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2207 if (result != JNI_OK) {
2208 return result;
2209 }
2210
2211 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2212 // variable (if present).
2213 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2214 if (result != JNI_OK) {
2215 return result;
2216 }
2217
2218 // Parse args structure generated from the command line flags.
2219 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2220 if (result != JNI_OK) {
2221 return result;
2222 }
2223
2224 // Parse args structure generated from the _JAVA_OPTIONS environment
2225 // variable (if present) (mimics classic VM)
2226 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2227 if (result != JNI_OK) {
2228 return result;
2229 }
2230
2231 // We need to ensure processor and memory resources have been properly
2232 // configured - which may rely on arguments we just processed - before
2233 // doing the final argument processing. Any argument processing that
2234 // needs to know about processor and memory resources must occur after
2235 // this point.
2236
2237 os::init_container_support();
2238
2239 // Do final processing now that all arguments have been parsed
2240 result = finalize_vm_init_args(patch_mod_javabase);
2241 if (result != JNI_OK) {
2242 return result;
2243 }
2244
2245 return JNI_OK;
2246 }
2247
2248 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2249 // represents a valid JDWP agent. is_path==true denotes that we
2250 // are dealing with -agentpath (case where name is a path), otherwise with
2251 // -agentlib
2252 bool valid_jdwp_agent(char *name, bool is_path) {
2253 char *_name;
2254 const char *_jdwp = "jdwp";
2255 size_t _len_jdwp, _len_prefix;
2256
2257 if (is_path) {
2258 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2259 return false;
2260 }
2261
2262 _name++; // skip past last path separator
2263 _len_prefix = strlen(JNI_LIB_PREFIX);
2264
2265 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2266 return false;
2267 }
2268
2269 _name += _len_prefix;
2270 _len_jdwp = strlen(_jdwp);
2271
2272 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2273 _name += _len_jdwp;
2274 }
2275 else {
2276 return false;
2277 }
2278
2279 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2280 return false;
2281 }
2282
2283 return true;
2284 }
2285
2286 if (strcmp(name, _jdwp) == 0) {
2287 return true;
2288 }
2289
2290 return false;
2291 }
2292
2293 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2294 // --patch-module=<module>=<file>(<pathsep><file>)*
2295 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2296 // Find the equal sign between the module name and the path specification
2297 const char* module_equal = strchr(patch_mod_tail, '=');
2298 if (module_equal == NULL) {
2299 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2300 return JNI_ERR;
2301 } else {
2302 // Pick out the module name
2303 size_t module_len = module_equal - patch_mod_tail;
2304 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2305 if (module_name != NULL) {
2306 memcpy(module_name, patch_mod_tail, module_len);
2307 *(module_name + module_len) = '\0';
2308 // The path piece begins one past the module_equal sign
2309 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2310 FREE_C_HEAP_ARRAY(char, module_name);
2311 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2312 return JNI_ENOMEM;
2313 }
2314 } else {
2315 return JNI_ENOMEM;
2316 }
2317 }
2318 return JNI_OK;
2319 }
2320
2321 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2322 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2323 // The min and max sizes match the values in globals.hpp, but scaled
2324 // with K. The values have been chosen so that alignment with page
2325 // size doesn't change the max value, which makes the conversions
2326 // back and forth between Xss value and ThreadStackSize value easier.
2327 // The values have also been chosen to fit inside a 32-bit signed type.
2328 const julong min_ThreadStackSize = 0;
2329 const julong max_ThreadStackSize = 1 * M;
2330
2331 const julong min_size = min_ThreadStackSize * K;
2332 const julong max_size = max_ThreadStackSize * K;
2333
2334 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2335
2336 julong size = 0;
2337 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2338 if (errcode != arg_in_range) {
2339 bool silent = (option == NULL); // Allow testing to silence error messages
2340 if (!silent) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Invalid thread stack size: %s\n", option->optionString);
2343 describe_range_error(errcode);
2344 }
2345 return JNI_EINVAL;
2346 }
2347
2348 // Internally track ThreadStackSize in units of 1024 bytes.
2349 const julong size_aligned = align_up(size, K);
2350 assert(size <= size_aligned,
2351 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2352 size, size_aligned);
2353
2354 const julong size_in_K = size_aligned / K;
2355 assert(size_in_K < (julong)max_intx,
2356 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2357 size_in_K);
2358
2359 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2360 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2361 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2362 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2363 max_expanded, size_in_K);
2364
2365 *out_ThreadStackSize = (intx)size_in_K;
2366
2367 return JNI_OK;
2368 }
2369
2370 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2371 // For match_option to return remaining or value part of option string
2372 const char* tail;
2373
2374 // iterate over arguments
2375 for (int index = 0; index < args->nOptions; index++) {
2376 bool is_absolute_path = false; // for -agentpath vs -agentlib
2377
2378 const JavaVMOption* option = args->options + index;
2379
2380 if (!match_option(option, "-Djava.class.path", &tail) &&
2381 !match_option(option, "-Dsun.java.command", &tail) &&
2382 !match_option(option, "-Dsun.java.launcher", &tail)) {
2383
2384 // add all jvm options to the jvm_args string. This string
2385 // is used later to set the java.vm.args PerfData string constant.
2386 // the -Djava.class.path and the -Dsun.java.command options are
2387 // omitted from jvm_args string as each have their own PerfData
2388 // string constant object.
2389 build_jvm_args(option->optionString);
2390 }
2391
2392 // -verbose:[class/module/gc/jni]
2393 if (match_option(option, "-verbose", &tail)) {
2394 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2395 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2396 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2397 } else if (!strcmp(tail, ":module")) {
2398 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2399 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2400 } else if (!strcmp(tail, ":gc")) {
2401 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2402 } else if (!strcmp(tail, ":jni")) {
2403 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2404 }
2405 // -da / -ea / -disableassertions / -enableassertions
2406 // These accept an optional class/package name separated by a colon, e.g.,
2407 // -da:java.lang.Thread.
2408 } else if (match_option(option, user_assertion_options, &tail, true)) {
2409 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2410 if (*tail == '\0') {
2411 JavaAssertions::setUserClassDefault(enable);
2412 } else {
2413 assert(*tail == ':', "bogus match by match_option()");
2414 JavaAssertions::addOption(tail + 1, enable);
2415 }
2416 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2417 } else if (match_option(option, system_assertion_options, &tail, false)) {
2418 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2419 JavaAssertions::setSystemClassDefault(enable);
2420 // -bootclasspath:
2421 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2422 jio_fprintf(defaultStream::output_stream(),
2423 "-Xbootclasspath is no longer a supported option.\n");
2424 return JNI_EINVAL;
2425 // -bootclasspath/a:
2426 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2427 Arguments::append_sysclasspath(tail);
2428 // -bootclasspath/p:
2429 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2430 jio_fprintf(defaultStream::output_stream(),
2431 "-Xbootclasspath/p is no longer a supported option.\n");
2432 return JNI_EINVAL;
2433 // -Xrun
2434 } else if (match_option(option, "-Xrun", &tail)) {
2435 if (tail != NULL) {
2436 const char* pos = strchr(tail, ':');
2437 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2438 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2439 jio_snprintf(name, len + 1, "%s", tail);
2440
2441 char *options = NULL;
2442 if(pos != NULL) {
2443 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2444 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2445 }
2446 #if !INCLUDE_JVMTI
2447 if (strcmp(name, "jdwp") == 0) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Debugging agents are not supported in this VM\n");
2450 return JNI_ERR;
2451 }
2452 #endif // !INCLUDE_JVMTI
2453 add_init_library(name, options);
2454 }
2455 } else if (match_option(option, "--add-reads=", &tail)) {
2456 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2457 return JNI_ENOMEM;
2458 }
2459 } else if (match_option(option, "--add-exports=", &tail)) {
2460 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2461 return JNI_ENOMEM;
2462 }
2463 } else if (match_option(option, "--add-opens=", &tail)) {
2464 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2465 return JNI_ENOMEM;
2466 }
2467 } else if (match_option(option, "--add-modules=", &tail)) {
2468 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2469 return JNI_ENOMEM;
2470 }
2471 } else if (match_option(option, "--limit-modules=", &tail)) {
2472 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2473 return JNI_ENOMEM;
2474 }
2475 } else if (match_option(option, "--module-path=", &tail)) {
2476 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2477 return JNI_ENOMEM;
2478 }
2479 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2480 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2481 return JNI_ENOMEM;
2482 }
2483 } else if (match_option(option, "--patch-module=", &tail)) {
2484 // --patch-module=<module>=<file>(<pathsep><file>)*
2485 int res = process_patch_mod_option(tail, patch_mod_javabase);
2486 if (res != JNI_OK) {
2487 return res;
2488 }
2489 } else if (match_option(option, "--illegal-access=", &tail)) {
2490 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2491 return JNI_ENOMEM;
2492 }
2493 // -agentlib and -agentpath
2494 } else if (match_option(option, "-agentlib:", &tail) ||
2495 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2496 if(tail != NULL) {
2497 const char* pos = strchr(tail, '=');
2498 char* name;
2499 if (pos == NULL) {
2500 name = os::strdup_check_oom(tail, mtArguments);
2501 } else {
2502 size_t len = pos - tail;
2503 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2504 memcpy(name, tail, len);
2505 name[len] = '\0';
2506 }
2507
2508 char *options = NULL;
2509 if(pos != NULL) {
2510 options = os::strdup_check_oom(pos + 1, mtArguments);
2511 }
2512 #if !INCLUDE_JVMTI
2513 if (valid_jdwp_agent(name, is_absolute_path)) {
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Debugging agents are not supported in this VM\n");
2516 return JNI_ERR;
2517 }
2518 #endif // !INCLUDE_JVMTI
2519 add_init_agent(name, options, is_absolute_path);
2520 }
2521 // -javaagent
2522 } else if (match_option(option, "-javaagent:", &tail)) {
2523 #if !INCLUDE_JVMTI
2524 jio_fprintf(defaultStream::error_stream(),
2525 "Instrumentation agents are not supported in this VM\n");
2526 return JNI_ERR;
2527 #else
2528 if (tail != NULL) {
2529 size_t length = strlen(tail) + 1;
2530 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2531 jio_snprintf(options, length, "%s", tail);
2532 add_instrument_agent("instrument", options, false);
2533 // java agents need module java.instrument
2534 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2535 return JNI_ENOMEM;
2536 }
2537 }
2538 #endif // !INCLUDE_JVMTI
2539 // --enable_preview
2540 } else if (match_option(option, "--enable-preview")) {
2541 set_enable_preview();
2542 // -Xnoclassgc
2543 } else if (match_option(option, "-Xnoclassgc")) {
2544 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2545 return JNI_EINVAL;
2546 }
2547 // -Xbatch
2548 } else if (match_option(option, "-Xbatch")) {
2549 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2550 return JNI_EINVAL;
2551 }
2552 // -Xmn for compatibility with other JVM vendors
2553 } else if (match_option(option, "-Xmn", &tail)) {
2554 julong long_initial_young_size = 0;
2555 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2556 if (errcode != arg_in_range) {
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Invalid initial young generation size: %s\n", option->optionString);
2559 describe_range_error(errcode);
2560 return JNI_EINVAL;
2561 }
2562 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2563 return JNI_EINVAL;
2564 }
2565 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 // -Xms
2569 } else if (match_option(option, "-Xms", &tail)) {
2570 julong size = 0;
2571 // an initial heap size of 0 means automatically determine
2572 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2573 if (errcode != arg_in_range) {
2574 jio_fprintf(defaultStream::error_stream(),
2575 "Invalid initial heap size: %s\n", option->optionString);
2576 describe_range_error(errcode);
2577 return JNI_EINVAL;
2578 }
2579 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2580 return JNI_EINVAL;
2581 }
2582 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2583 return JNI_EINVAL;
2584 }
2585 // -Xmx
2586 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2587 julong long_max_heap_size = 0;
2588 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2589 if (errcode != arg_in_range) {
2590 jio_fprintf(defaultStream::error_stream(),
2591 "Invalid maximum heap size: %s\n", option->optionString);
2592 describe_range_error(errcode);
2593 return JNI_EINVAL;
2594 }
2595 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 // Xmaxf
2599 } else if (match_option(option, "-Xmaxf", &tail)) {
2600 char* err;
2601 int maxf = (int)(strtod(tail, &err) * 100);
2602 if (*err != '\0' || *tail == '\0') {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Bad max heap free percentage size: %s\n",
2605 option->optionString);
2606 return JNI_EINVAL;
2607 } else {
2608 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2609 return JNI_EINVAL;
2610 }
2611 }
2612 // Xminf
2613 } else if (match_option(option, "-Xminf", &tail)) {
2614 char* err;
2615 int minf = (int)(strtod(tail, &err) * 100);
2616 if (*err != '\0' || *tail == '\0') {
2617 jio_fprintf(defaultStream::error_stream(),
2618 "Bad min heap free percentage size: %s\n",
2619 option->optionString);
2620 return JNI_EINVAL;
2621 } else {
2622 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2623 return JNI_EINVAL;
2624 }
2625 }
2626 // -Xss
2627 } else if (match_option(option, "-Xss", &tail)) {
2628 intx value = 0;
2629 jint err = parse_xss(option, tail, &value);
2630 if (err != JNI_OK) {
2631 return err;
2632 }
2633 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2634 return JNI_EINVAL;
2635 }
2636 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2637 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2638 julong long_ReservedCodeCacheSize = 0;
2639
2640 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2641 if (errcode != arg_in_range) {
2642 jio_fprintf(defaultStream::error_stream(),
2643 "Invalid maximum code cache size: %s.\n", option->optionString);
2644 return JNI_EINVAL;
2645 }
2646 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 // -green
2650 } else if (match_option(option, "-green")) {
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Green threads support not available\n");
2653 return JNI_EINVAL;
2654 // -native
2655 } else if (match_option(option, "-native")) {
2656 // HotSpot always uses native threads, ignore silently for compatibility
2657 // -Xrs
2658 } else if (match_option(option, "-Xrs")) {
2659 // Classic/EVM option, new functionality
2660 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663 // -Xprof
2664 } else if (match_option(option, "-Xprof")) {
2665 char version[256];
2666 // Obsolete in JDK 10
2667 JDK_Version::jdk(10).to_string(version, sizeof(version));
2668 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2669 // -Xinternalversion
2670 } else if (match_option(option, "-Xinternalversion")) {
2671 jio_fprintf(defaultStream::output_stream(), "%s\n",
2672 VM_Version::internal_vm_info_string());
2673 vm_exit(0);
2674 #ifndef PRODUCT
2675 // -Xprintflags
2676 } else if (match_option(option, "-Xprintflags")) {
2677 JVMFlag::printFlags(tty, false);
2678 vm_exit(0);
2679 #endif
2680 // -D
2681 } else if (match_option(option, "-D", &tail)) {
2682 const char* value;
2683 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2684 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2685 // abort if -Djava.endorsed.dirs is set
2686 jio_fprintf(defaultStream::output_stream(),
2687 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2688 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2689 return JNI_EINVAL;
2690 }
2691 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2692 *value != '\0' && strcmp(value, "\"\"") != 0) {
2693 // abort if -Djava.ext.dirs is set
2694 jio_fprintf(defaultStream::output_stream(),
2695 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2696 return JNI_EINVAL;
2697 }
2698 // Check for module related properties. They must be set using the modules
2699 // options. For example: use "--add-modules=java.sql", not
2700 // "-Djdk.module.addmods=java.sql"
2701 if (is_internal_module_property(option->optionString + 2)) {
2702 needs_module_property_warning = true;
2703 continue;
2704 }
2705 if (!add_property(tail)) {
2706 return JNI_ENOMEM;
2707 }
2708 // Out of the box management support
2709 if (match_option(option, "-Dcom.sun.management", &tail)) {
2710 #if INCLUDE_MANAGEMENT
2711 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 // management agent in module jdk.management.agent
2715 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2716 return JNI_ENOMEM;
2717 }
2718 #else
2719 jio_fprintf(defaultStream::output_stream(),
2720 "-Dcom.sun.management is not supported in this VM.\n");
2721 return JNI_ERR;
2722 #endif
2723 }
2724 // -Xint
2725 } else if (match_option(option, "-Xint")) {
2726 set_mode_flags(_int);
2727 // -Xmixed
2728 } else if (match_option(option, "-Xmixed")) {
2729 set_mode_flags(_mixed);
2730 // -Xcomp
2731 } else if (match_option(option, "-Xcomp")) {
2732 // for testing the compiler; turn off all flags that inhibit compilation
2733 set_mode_flags(_comp);
2734 // -Xshare:dump
2735 } else if (match_option(option, "-Xshare:dump")) {
2736 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 // -Xshare:on
2740 } else if (match_option(option, "-Xshare:on")) {
2741 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2748 } else if (match_option(option, "-Xshare:auto")) {
2749 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 // -Xshare:off
2756 } else if (match_option(option, "-Xshare:off")) {
2757 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 // -Xverify
2764 } else if (match_option(option, "-Xverify", &tail)) {
2765 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2766 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2770 return JNI_EINVAL;
2771 }
2772 } else if (strcmp(tail, ":remote") == 0) {
2773 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2774 return JNI_EINVAL;
2775 }
2776 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 } else if (strcmp(tail, ":none") == 0) {
2780 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2787 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2788 return JNI_EINVAL;
2789 }
2790 // -Xdebug
2791 } else if (match_option(option, "-Xdebug")) {
2792 // note this flag has been used, then ignore
2793 set_xdebug_mode(true);
2794 // -Xnoagent
2795 } else if (match_option(option, "-Xnoagent")) {
2796 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2797 } else if (match_option(option, "-Xloggc:", &tail)) {
2798 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2799 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2800 _gc_log_filename = os::strdup_check_oom(tail);
2801 } else if (match_option(option, "-Xlog", &tail)) {
2802 bool ret = false;
2803 if (strcmp(tail, ":help") == 0) {
2804 fileStream stream(defaultStream::output_stream());
2805 LogConfiguration::print_command_line_help(&stream);
2806 vm_exit(0);
2807 } else if (strcmp(tail, ":disable") == 0) {
2808 LogConfiguration::disable_logging();
2809 ret = true;
2810 } else if (*tail == '\0') {
2811 ret = LogConfiguration::parse_command_line_arguments();
2812 assert(ret, "-Xlog without arguments should never fail to parse");
2813 } else if (*tail == ':') {
2814 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2815 }
2816 if (ret == false) {
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2819 tail);
2820 return JNI_EINVAL;
2821 }
2822 // JNI hooks
2823 } else if (match_option(option, "-Xcheck", &tail)) {
2824 if (!strcmp(tail, ":jni")) {
2825 #if !INCLUDE_JNI_CHECK
2826 warning("JNI CHECKING is not supported in this VM");
2827 #else
2828 CheckJNICalls = true;
2829 #endif // INCLUDE_JNI_CHECK
2830 } else if (is_bad_option(option, args->ignoreUnrecognized,
2831 "check")) {
2832 return JNI_EINVAL;
2833 }
2834 } else if (match_option(option, "vfprintf")) {
2835 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2836 } else if (match_option(option, "exit")) {
2837 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2838 } else if (match_option(option, "abort")) {
2839 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2840 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2841 // and the last option wins.
2842 } else if (match_option(option, "-XX:+NeverTenure")) {
2843 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2844 return JNI_EINVAL;
2845 }
2846 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2847 return JNI_EINVAL;
2848 }
2849 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2850 return JNI_EINVAL;
2851 }
2852 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2853 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2857 return JNI_EINVAL;
2858 }
2859 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2863 uintx max_tenuring_thresh = 0;
2864 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2865 jio_fprintf(defaultStream::error_stream(),
2866 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2867 return JNI_EINVAL;
2868 }
2869
2870 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2871 return JNI_EINVAL;
2872 }
2873
2874 if (MaxTenuringThreshold == 0) {
2875 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2879 return JNI_EINVAL;
2880 }
2881 } else {
2882 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 }
2889 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2890 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2897 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2898 return JNI_EINVAL;
2899 }
2900 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2904 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2911 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2918 #if defined(DTRACE_ENABLED)
2919 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 #else // defined(DTRACE_ENABLED)
2932 jio_fprintf(defaultStream::error_stream(),
2933 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2934 return JNI_EINVAL;
2935 #endif // defined(DTRACE_ENABLED)
2936 #ifdef ASSERT
2937 } else if (match_option(option, "-XX:+FullGCALot")) {
2938 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2939 return JNI_EINVAL;
2940 }
2941 // disable scavenge before parallel mark-compact
2942 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 #endif
2946 #if !INCLUDE_MANAGEMENT
2947 } else if (match_option(option, "-XX:+ManagementServer")) {
2948 jio_fprintf(defaultStream::error_stream(),
2949 "ManagementServer is not supported in this VM.\n");
2950 return JNI_ERR;
2951 #endif // INCLUDE_MANAGEMENT
2952 #if INCLUDE_JVMCI
2953 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2954 if (EnableJVMCIProduct) {
2955 jio_fprintf(defaultStream::error_stream(),
2956 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2957 return JNI_EINVAL;
2958 }
2959 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2960 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2961 // Allow this flag if it has been unlocked.
2962 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2963 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2964 jio_fprintf(defaultStream::error_stream(),
2965 "Unable to enable JVMCI in product mode");
2966 return JNI_ERR;
2967 }
2968 }
2969 // The flag was locked so process normally to report that error
2970 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2971 return JNI_EINVAL;
2972 }
2973 #endif // INCLUDE_JVMCI
2974 #if INCLUDE_JFR
2975 } else if (match_jfr_option(&option)) {
2976 return JNI_EINVAL;
2977 #endif
2978 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2979 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2980 // already been handled
2981 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2982 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2983 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2984 return JNI_EINVAL;
2985 }
2986 }
2987 // Unknown option
2988 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2989 return JNI_ERR;
2990 }
2991 }
2992
2993 // PrintSharedArchiveAndExit will turn on
2994 // -Xshare:on
2995 // -Xlog:class+path=info
2996 if (PrintSharedArchiveAndExit) {
2997 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2998 return JNI_EINVAL;
2999 }
3000 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3004 }
3005
3006 fix_appclasspath();
3007
3008 return JNI_OK;
3009 }
3010
3011 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3012 // For java.base check for duplicate --patch-module options being specified on the command line.
3013 // This check is only required for java.base, all other duplicate module specifications
3014 // will be checked during module system initialization. The module system initialization
3015 // will throw an ExceptionInInitializerError if this situation occurs.
3016 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3017 if (*patch_mod_javabase) {
3018 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3019 } else {
3020 *patch_mod_javabase = true;
3021 }
3022 }
3023
3024 // Create GrowableArray lazily, only if --patch-module has been specified
3025 if (_patch_mod_prefix == NULL) {
3026 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3027 }
3028
3029 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3030 }
3031
3032 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3033 //
3034 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3035 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3036 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3037 // path is treated as the current directory.
3038 //
3039 // This causes problems with CDS, which requires that all directories specified in the classpath
3040 // must be empty. In most cases, applications do NOT want to load classes from the current
3041 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3042 // scripts compatible with CDS.
3043 void Arguments::fix_appclasspath() {
3044 if (IgnoreEmptyClassPaths) {
3045 const char separator = *os::path_separator();
3046 const char* src = _java_class_path->value();
3047
3048 // skip over all the leading empty paths
3049 while (*src == separator) {
3050 src ++;
3051 }
3052
3053 char* copy = os::strdup_check_oom(src, mtArguments);
3054
3055 // trim all trailing empty paths
3056 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3057 *tail = '\0';
3058 }
3059
3060 char from[3] = {separator, separator, '\0'};
3061 char to [2] = {separator, '\0'};
3062 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3063 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3064 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3065 }
3066
3067 _java_class_path->set_writeable_value(copy);
3068 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3069 }
3070 }
3071
3072 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3073 // check if the default lib/endorsed directory exists; if so, error
3074 char path[JVM_MAXPATHLEN];
3075 const char* fileSep = os::file_separator();
3076 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3077
3078 DIR* dir = os::opendir(path);
3079 if (dir != NULL) {
3080 jio_fprintf(defaultStream::output_stream(),
3081 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3082 "in modular form will be supported via the concept of upgradeable modules.\n");
3083 os::closedir(dir);
3084 return JNI_ERR;
3085 }
3086
3087 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3088 dir = os::opendir(path);
3089 if (dir != NULL) {
3090 jio_fprintf(defaultStream::output_stream(),
3091 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3092 "Use -classpath instead.\n.");
3093 os::closedir(dir);
3094 return JNI_ERR;
3095 }
3096
3097 // This must be done after all arguments have been processed
3098 // and the container support has been initialized since AggressiveHeap
3099 // relies on the amount of total memory available.
3100 if (AggressiveHeap) {
3101 jint result = set_aggressive_heap_flags();
3102 if (result != JNI_OK) {
3103 return result;
3104 }
3105 }
3106
3107 // This must be done after all arguments have been processed.
3108 // java_compiler() true means set to "NONE" or empty.
3109 if (java_compiler() && !xdebug_mode()) {
3110 // For backwards compatibility, we switch to interpreted mode if
3111 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3112 // not specified.
3113 set_mode_flags(_int);
3114 }
3115
3116 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3117 // but like -Xint, leave compilation thresholds unaffected.
3118 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3119 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3120 set_mode_flags(_int);
3121 }
3122
3123 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3124 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3125 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3126 }
3127
3128 #if !COMPILER2_OR_JVMCI
3129 // Don't degrade server performance for footprint
3130 if (FLAG_IS_DEFAULT(UseLargePages) &&
3131 MaxHeapSize < LargePageHeapSizeThreshold) {
3132 // No need for large granularity pages w/small heaps.
3133 // Note that large pages are enabled/disabled for both the
3134 // Java heap and the code cache.
3135 FLAG_SET_DEFAULT(UseLargePages, false);
3136 }
3137
3138 UNSUPPORTED_OPTION(ProfileInterpreter);
3139 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3140 #endif
3141
3142
3143 #ifdef TIERED
3144 // Parse the CompilationMode flag
3145 if (!CompilationModeFlag::initialize()) {
3146 return JNI_ERR;
3147 }
3148 #else
3149 // Tiered compilation is undefined.
3150 UNSUPPORTED_OPTION(TieredCompilation);
3151 #endif
3152
3153 if (!check_vm_args_consistency()) {
3154 return JNI_ERR;
3155 }
3156
3157 #if INCLUDE_CDS
3158 if (DumpSharedSpaces) {
3159 // Disable biased locking now as it interferes with the clean up of
3160 // the archived Klasses and Java string objects (at dump time only).
3161 UseBiasedLocking = false;
3162
3163 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3164 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3165 // compiler just to be safe.
3166 //
3167 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3168 // instead of modifying them in place. The copy is inaccessible to the compiler.
3169 // TODO: revisit the following for the static archive case.
3170 set_mode_flags(_int);
3171 }
3172 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3173 // Always verify non-system classes during CDS dump
3174 if (!BytecodeVerificationRemote) {
3175 BytecodeVerificationRemote = true;
3176 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3177 }
3178 }
3179 if (ArchiveClassesAtExit == NULL) {
3180 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3181 }
3182 if (UseSharedSpaces && patch_mod_javabase) {
3183 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3184 }
3185 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3186 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3187 }
3188 #endif
3189
3190 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3191 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3192 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3193
3194 return JNI_OK;
3195 }
3196
3197 // Helper class for controlling the lifetime of JavaVMInitArgs
3198 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3199 // deleted on the destruction of the ScopedVMInitArgs object.
3200 class ScopedVMInitArgs : public StackObj {
3201 private:
3202 JavaVMInitArgs _args;
3203 char* _container_name;
3204 bool _is_set;
3205 char* _vm_options_file_arg;
3206
3207 public:
3208 ScopedVMInitArgs(const char *container_name) {
3209 _args.version = JNI_VERSION_1_2;
3210 _args.nOptions = 0;
3211 _args.options = NULL;
3212 _args.ignoreUnrecognized = false;
3213 _container_name = (char *)container_name;
3214 _is_set = false;
3215 _vm_options_file_arg = NULL;
3216 }
3217
3218 // Populates the JavaVMInitArgs object represented by this
3219 // ScopedVMInitArgs object with the arguments in options. The
3220 // allocated memory is deleted by the destructor. If this method
3221 // returns anything other than JNI_OK, then this object is in a
3222 // partially constructed state, and should be abandoned.
3223 jint set_args(GrowableArray<JavaVMOption>* options) {
3224 _is_set = true;
3225 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3226 JavaVMOption, options->length(), mtArguments);
3227 if (options_arr == NULL) {
3228 return JNI_ENOMEM;
3229 }
3230 _args.options = options_arr;
3231
3232 for (int i = 0; i < options->length(); i++) {
3233 options_arr[i] = options->at(i);
3234 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3235 if (options_arr[i].optionString == NULL) {
3236 // Rely on the destructor to do cleanup.
3237 _args.nOptions = i;
3238 return JNI_ENOMEM;
3239 }
3240 }
3241
3242 _args.nOptions = options->length();
3243 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3244 return JNI_OK;
3245 }
3246
3247 JavaVMInitArgs* get() { return &_args; }
3248 char* container_name() { return _container_name; }
3249 bool is_set() { return _is_set; }
3250 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3251 char* vm_options_file_arg() { return _vm_options_file_arg; }
3252
3253 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3254 if (_vm_options_file_arg != NULL) {
3255 os::free(_vm_options_file_arg);
3256 }
3257 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3258 }
3259
3260 ~ScopedVMInitArgs() {
3261 if (_vm_options_file_arg != NULL) {
3262 os::free(_vm_options_file_arg);
3263 }
3264 if (_args.options == NULL) return;
3265 for (int i = 0; i < _args.nOptions; i++) {
3266 os::free(_args.options[i].optionString);
3267 }
3268 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3269 }
3270
3271 // Insert options into this option list, to replace option at
3272 // vm_options_file_pos (-XX:VMOptionsFile)
3273 jint insert(const JavaVMInitArgs* args,
3274 const JavaVMInitArgs* args_to_insert,
3275 const int vm_options_file_pos) {
3276 assert(_args.options == NULL, "shouldn't be set yet");
3277 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3278 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3279
3280 int length = args->nOptions + args_to_insert->nOptions - 1;
3281 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3282 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3283 for (int i = 0; i < args->nOptions; i++) {
3284 if (i == vm_options_file_pos) {
3285 // insert the new options starting at the same place as the
3286 // -XX:VMOptionsFile option
3287 for (int j = 0; j < args_to_insert->nOptions; j++) {
3288 options->push(args_to_insert->options[j]);
3289 }
3290 } else {
3291 options->push(args->options[i]);
3292 }
3293 }
3294 // make into options array
3295 jint result = set_args(options);
3296 delete options;
3297 return result;
3298 }
3299 };
3300
3301 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3302 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3303 }
3304
3305 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3306 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3307 }
3308
3309 jint Arguments::parse_options_environment_variable(const char* name,
3310 ScopedVMInitArgs* vm_args) {
3311 char *buffer = ::getenv(name);
3312
3313 // Don't check this environment variable if user has special privileges
3314 // (e.g. unix su command).
3315 if (buffer == NULL || os::have_special_privileges()) {
3316 return JNI_OK;
3317 }
3318
3319 if ((buffer = os::strdup(buffer)) == NULL) {
3320 return JNI_ENOMEM;
3321 }
3322
3323 jio_fprintf(defaultStream::error_stream(),
3324 "Picked up %s: %s\n", name, buffer);
3325
3326 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3327
3328 os::free(buffer);
3329 return retcode;
3330 }
3331
3332 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3333 // read file into buffer
3334 int fd = ::open(file_name, O_RDONLY);
3335 if (fd < 0) {
3336 jio_fprintf(defaultStream::error_stream(),
3337 "Could not open options file '%s'\n",
3338 file_name);
3339 return JNI_ERR;
3340 }
3341
3342 struct stat stbuf;
3343 int retcode = os::stat(file_name, &stbuf);
3344 if (retcode != 0) {
3345 jio_fprintf(defaultStream::error_stream(),
3346 "Could not stat options file '%s'\n",
3347 file_name);
3348 os::close(fd);
3349 return JNI_ERR;
3350 }
3351
3352 if (stbuf.st_size == 0) {
3353 // tell caller there is no option data and that is ok
3354 os::close(fd);
3355 return JNI_OK;
3356 }
3357
3358 // '+ 1' for NULL termination even with max bytes
3359 size_t bytes_alloc = stbuf.st_size + 1;
3360
3361 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3362 if (NULL == buf) {
3363 jio_fprintf(defaultStream::error_stream(),
3364 "Could not allocate read buffer for options file parse\n");
3365 os::close(fd);
3366 return JNI_ENOMEM;
3367 }
3368
3369 memset(buf, 0, bytes_alloc);
3370
3371 // Fill buffer
3372 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3373 os::close(fd);
3374 if (bytes_read < 0) {
3375 FREE_C_HEAP_ARRAY(char, buf);
3376 jio_fprintf(defaultStream::error_stream(),
3377 "Could not read options file '%s'\n", file_name);
3378 return JNI_ERR;
3379 }
3380
3381 if (bytes_read == 0) {
3382 // tell caller there is no option data and that is ok
3383 FREE_C_HEAP_ARRAY(char, buf);
3384 return JNI_OK;
3385 }
3386
3387 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3388
3389 FREE_C_HEAP_ARRAY(char, buf);
3390 return retcode;
3391 }
3392
3393 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3394 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3395
3396 // some pointers to help with parsing
3397 char *buffer_end = buffer + buf_len;
3398 char *opt_hd = buffer;
3399 char *wrt = buffer;
3400 char *rd = buffer;
3401
3402 // parse all options
3403 while (rd < buffer_end) {
3404 // skip leading white space from the input string
3405 while (rd < buffer_end && isspace(*rd)) {
3406 rd++;
3407 }
3408
3409 if (rd >= buffer_end) {
3410 break;
3411 }
3412
3413 // Remember this is where we found the head of the token.
3414 opt_hd = wrt;
3415
3416 // Tokens are strings of non white space characters separated
3417 // by one or more white spaces.
3418 while (rd < buffer_end && !isspace(*rd)) {
3419 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3420 int quote = *rd; // matching quote to look for
3421 rd++; // don't copy open quote
3422 while (rd < buffer_end && *rd != quote) {
3423 // include everything (even spaces)
3424 // up until the close quote
3425 *wrt++ = *rd++; // copy to option string
3426 }
3427
3428 if (rd < buffer_end) {
3429 rd++; // don't copy close quote
3430 } else {
3431 // did not see closing quote
3432 jio_fprintf(defaultStream::error_stream(),
3433 "Unmatched quote in %s\n", name);
3434 delete options;
3435 return JNI_ERR;
3436 }
3437 } else {
3438 *wrt++ = *rd++; // copy to option string
3439 }
3440 }
3441
3442 // steal a white space character and set it to NULL
3443 *wrt++ = '\0';
3444 // We now have a complete token
3445
3446 JavaVMOption option;
3447 option.optionString = opt_hd;
3448 option.extraInfo = NULL;
3449
3450 options->append(option); // Fill in option
3451
3452 rd++; // Advance to next character
3453 }
3454
3455 // Fill out JavaVMInitArgs structure.
3456 jint status = vm_args->set_args(options);
3457
3458 delete options;
3459 return status;
3460 }
3461
3462 void Arguments::set_shared_spaces_flags() {
3463 if (DumpSharedSpaces) {
3464 if (RequireSharedSpaces) {
3465 warning("Cannot dump shared archive while using shared archive");
3466 }
3467 UseSharedSpaces = false;
3468 #ifdef _LP64
3469 if (!UseCompressedOops || !UseCompressedClassPointers) {
3470 vm_exit_during_initialization(
3471 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3472 }
3473 } else {
3474 if (!UseCompressedOops || !UseCompressedClassPointers) {
3475 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3476 }
3477 #endif
3478 }
3479 }
3480
3481 #if INCLUDE_CDS
3482 // Sharing support
3483 // Construct the path to the archive
3484 char* Arguments::get_default_shared_archive_path() {
3485 char *default_archive_path;
3486 char jvm_path[JVM_MAXPATHLEN];
3487 os::jvm_path(jvm_path, sizeof(jvm_path));
3488 char *end = strrchr(jvm_path, *os::file_separator());
3489 if (end != NULL) *end = '\0';
3490 size_t jvm_path_len = strlen(jvm_path);
3491 size_t file_sep_len = strlen(os::file_separator());
3492 const size_t len = jvm_path_len + file_sep_len + 20;
3493 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3494 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3495 jvm_path, os::file_separator());
3496 return default_archive_path;
3497 }
3498
3499 int Arguments::num_archives(const char* archive_path) {
3500 if (archive_path == NULL) {
3501 return 0;
3502 }
3503 int npaths = 1;
3504 char* p = (char*)archive_path;
3505 while (*p != '\0') {
3506 if (*p == os::path_separator()[0]) {
3507 npaths++;
3508 }
3509 p++;
3510 }
3511 return npaths;
3512 }
3513
3514 void Arguments::extract_shared_archive_paths(const char* archive_path,
3515 char** base_archive_path,
3516 char** top_archive_path) {
3517 char* begin_ptr = (char*)archive_path;
3518 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3519 if (end_ptr == NULL || end_ptr == begin_ptr) {
3520 vm_exit_during_initialization("Base archive was not specified", archive_path);
3521 }
3522 size_t len = end_ptr - begin_ptr;
3523 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3524 strncpy(cur_path, begin_ptr, len);
3525 cur_path[len] = '\0';
3526 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3527 *base_archive_path = cur_path;
3528
3529 begin_ptr = ++end_ptr;
3530 if (*begin_ptr == '\0') {
3531 vm_exit_during_initialization("Top archive was not specified", archive_path);
3532 }
3533 end_ptr = strchr(begin_ptr, '\0');
3534 assert(end_ptr != NULL, "sanity");
3535 len = end_ptr - begin_ptr;
3536 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3537 strncpy(cur_path, begin_ptr, len + 1);
3538 //cur_path[len] = '\0';
3539 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3540 *top_archive_path = cur_path;
3541 }
3542
3543 bool Arguments::init_shared_archive_paths() {
3544 if (ArchiveClassesAtExit != NULL) {
3545 if (DumpSharedSpaces) {
3546 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3547 }
3548 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3549 return false;
3550 }
3551 check_unsupported_dumping_properties();
3552 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3553 }
3554 if (SharedArchiveFile == NULL) {
3555 SharedArchivePath = get_default_shared_archive_path();
3556 } else {
3557 int archives = num_archives(SharedArchiveFile);
3558 if (is_dumping_archive()) {
3559 if (archives > 1) {
3560 vm_exit_during_initialization(
3561 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3562 }
3563 if (DynamicDumpSharedSpaces) {
3564 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3565 vm_exit_during_initialization(
3566 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3567 SharedArchiveFile);
3568 }
3569 }
3570 }
3571 if (!is_dumping_archive()){
3572 if (archives > 2) {
3573 vm_exit_during_initialization(
3574 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3575 }
3576 if (archives == 1) {
3577 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3578 int name_size;
3579 bool success =
3580 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3581 if (!success) {
3582 SharedArchivePath = temp_archive_path;
3583 } else {
3584 SharedDynamicArchivePath = temp_archive_path;
3585 }
3586 } else {
3587 extract_shared_archive_paths((const char*)SharedArchiveFile,
3588 &SharedArchivePath, &SharedDynamicArchivePath);
3589 }
3590 } else { // CDS dumping
3591 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3592 }
3593 }
3594 return (SharedArchivePath != NULL);
3595 }
3596 #endif // INCLUDE_CDS
3597
3598 #ifndef PRODUCT
3599 // Determine whether LogVMOutput should be implicitly turned on.
3600 static bool use_vm_log() {
3601 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3602 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3603 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3604 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3605 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3606 return true;
3607 }
3608
3609 #ifdef COMPILER1
3610 if (PrintC1Statistics) {
3611 return true;
3612 }
3613 #endif // COMPILER1
3614
3615 #ifdef COMPILER2
3616 if (PrintOptoAssembly || PrintOptoStatistics) {
3617 return true;
3618 }
3619 #endif // COMPILER2
3620
3621 return false;
3622 }
3623
3624 #endif // PRODUCT
3625
3626 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3627 for (int index = 0; index < args->nOptions; index++) {
3628 const JavaVMOption* option = args->options + index;
3629 const char* tail;
3630 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3631 return true;
3632 }
3633 }
3634 return false;
3635 }
3636
3637 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3638 const char* vm_options_file,
3639 const int vm_options_file_pos,
3640 ScopedVMInitArgs* vm_options_file_args,
3641 ScopedVMInitArgs* args_out) {
3642 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3643 if (code != JNI_OK) {
3644 return code;
3645 }
3646
3647 if (vm_options_file_args->get()->nOptions < 1) {
3648 return JNI_OK;
3649 }
3650
3651 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3652 jio_fprintf(defaultStream::error_stream(),
3653 "A VM options file may not refer to a VM options file. "
3654 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3655 "options file '%s' in options container '%s' is an error.\n",
3656 vm_options_file_args->vm_options_file_arg(),
3657 vm_options_file_args->container_name());
3658 return JNI_EINVAL;
3659 }
3660
3661 return args_out->insert(args, vm_options_file_args->get(),
3662 vm_options_file_pos);
3663 }
3664
3665 // Expand -XX:VMOptionsFile found in args_in as needed.
3666 // mod_args and args_out parameters may return values as needed.
3667 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3668 ScopedVMInitArgs* mod_args,
3669 JavaVMInitArgs** args_out) {
3670 jint code = match_special_option_and_act(args_in, mod_args);
3671 if (code != JNI_OK) {
3672 return code;
3673 }
3674
3675 if (mod_args->is_set()) {
3676 // args_in contains -XX:VMOptionsFile and mod_args contains the
3677 // original options from args_in along with the options expanded
3678 // from the VMOptionsFile. Return a short-hand to the caller.
3679 *args_out = mod_args->get();
3680 } else {
3681 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3682 }
3683 return JNI_OK;
3684 }
3685
3686 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3687 ScopedVMInitArgs* args_out) {
3688 // Remaining part of option string
3689 const char* tail;
3690 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3691
3692 for (int index = 0; index < args->nOptions; index++) {
3693 const JavaVMOption* option = args->options + index;
3694 if (match_option(option, "-XX:Flags=", &tail)) {
3695 Arguments::set_jvm_flags_file(tail);
3696 continue;
3697 }
3698 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3699 if (vm_options_file_args.found_vm_options_file_arg()) {
3700 jio_fprintf(defaultStream::error_stream(),
3701 "The option '%s' is already specified in the options "
3702 "container '%s' so the specification of '%s' in the "
3703 "same options container is an error.\n",
3704 vm_options_file_args.vm_options_file_arg(),
3705 vm_options_file_args.container_name(),
3706 option->optionString);
3707 return JNI_EINVAL;
3708 }
3709 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3710 // If there's a VMOptionsFile, parse that
3711 jint code = insert_vm_options_file(args, tail, index,
3712 &vm_options_file_args, args_out);
3713 if (code != JNI_OK) {
3714 return code;
3715 }
3716 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3717 if (args_out->is_set()) {
3718 // The VMOptions file inserted some options so switch 'args'
3719 // to the new set of options, and continue processing which
3720 // preserves "last option wins" semantics.
3721 args = args_out->get();
3722 // The first option from the VMOptionsFile replaces the
3723 // current option. So we back track to process the
3724 // replacement option.
3725 index--;
3726 }
3727 continue;
3728 }
3729 if (match_option(option, "-XX:+PrintVMOptions")) {
3730 PrintVMOptions = true;
3731 continue;
3732 }
3733 if (match_option(option, "-XX:-PrintVMOptions")) {
3734 PrintVMOptions = false;
3735 continue;
3736 }
3737 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3738 IgnoreUnrecognizedVMOptions = true;
3739 continue;
3740 }
3741 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3742 IgnoreUnrecognizedVMOptions = false;
3743 continue;
3744 }
3745 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3746 JVMFlag::printFlags(tty, false);
3747 vm_exit(0);
3748 }
3749 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3750 #if INCLUDE_NMT
3751 // The launcher did not setup nmt environment variable properly.
3752 if (!MemTracker::check_launcher_nmt_support(tail)) {
3753 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3754 }
3755
3756 // Verify if nmt option is valid.
3757 if (MemTracker::verify_nmt_option()) {
3758 // Late initialization, still in single-threaded mode.
3759 if (MemTracker::tracking_level() >= NMT_summary) {
3760 MemTracker::init();
3761 }
3762 } else {
3763 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3764 }
3765 continue;
3766 #else
3767 jio_fprintf(defaultStream::error_stream(),
3768 "Native Memory Tracking is not supported in this VM\n");
3769 return JNI_ERR;
3770 #endif
3771 }
3772
3773 #ifndef PRODUCT
3774 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3775 JVMFlag::printFlags(tty, true);
3776 vm_exit(0);
3777 }
3778 #endif
3779 }
3780 return JNI_OK;
3781 }
3782
3783 static void print_options(const JavaVMInitArgs *args) {
3784 const char* tail;
3785 for (int index = 0; index < args->nOptions; index++) {
3786 const JavaVMOption *option = args->options + index;
3787 if (match_option(option, "-XX:", &tail)) {
3788 logOption(tail);
3789 }
3790 }
3791 }
3792
3793 bool Arguments::handle_deprecated_print_gc_flags() {
3794 if (PrintGC) {
3795 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3796 }
3797 if (PrintGCDetails) {
3798 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3799 }
3800
3801 if (_gc_log_filename != NULL) {
3802 // -Xloggc was used to specify a filename
3803 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3804
3805 LogTarget(Error, logging) target;
3806 LogStream errstream(target);
3807 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3808 } else if (PrintGC || PrintGCDetails) {
3809 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3810 }
3811 return true;
3812 }
3813
3814 // Parse entry point called from JNI_CreateJavaVM
3815
3816 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3817 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3818
3819 // Initialize ranges, constraints and writeables
3820 JVMFlagRangeList::init();
3821 JVMFlagConstraintList::init();
3822 JVMFlagWriteableList::init();
3823
3824 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3825 const char* hotspotrc = ".hotspotrc";
3826 bool settings_file_specified = false;
3827 bool needs_hotspotrc_warning = false;
3828 ScopedVMInitArgs initial_vm_options_args("");
3829 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3830 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3831
3832 // Pointers to current working set of containers
3833 JavaVMInitArgs* cur_cmd_args;
3834 JavaVMInitArgs* cur_vm_options_args;
3835 JavaVMInitArgs* cur_java_options_args;
3836 JavaVMInitArgs* cur_java_tool_options_args;
3837
3838 // Containers for modified/expanded options
3839 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3840 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3841 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3842 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3843
3844
3845 jint code =
3846 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3847 if (code != JNI_OK) {
3848 return code;
3849 }
3850
3851 code = parse_java_options_environment_variable(&initial_java_options_args);
3852 if (code != JNI_OK) {
3853 return code;
3854 }
3855
3856 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3857 char *vmoptions = ClassLoader::lookup_vm_options();
3858 if (vmoptions != NULL) {
3859 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3860 FREE_C_HEAP_ARRAY(char, vmoptions);
3861 if (code != JNI_OK) {
3862 return code;
3863 }
3864 }
3865
3866 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3867 &mod_java_tool_options_args,
3868 &cur_java_tool_options_args);
3869 if (code != JNI_OK) {
3870 return code;
3871 }
3872
3873 code = expand_vm_options_as_needed(initial_cmd_args,
3874 &mod_cmd_args,
3875 &cur_cmd_args);
3876 if (code != JNI_OK) {
3877 return code;
3878 }
3879
3880 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3881 &mod_java_options_args,
3882 &cur_java_options_args);
3883 if (code != JNI_OK) {
3884 return code;
3885 }
3886
3887 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3888 &mod_vm_options_args,
3889 &cur_vm_options_args);
3890 if (code != JNI_OK) {
3891 return code;
3892 }
3893
3894 const char* flags_file = Arguments::get_jvm_flags_file();
3895 settings_file_specified = (flags_file != NULL);
3896
3897 if (IgnoreUnrecognizedVMOptions) {
3898 cur_cmd_args->ignoreUnrecognized = true;
3899 cur_java_tool_options_args->ignoreUnrecognized = true;
3900 cur_java_options_args->ignoreUnrecognized = true;
3901 }
3902
3903 // Parse specified settings file
3904 if (settings_file_specified) {
3905 if (!process_settings_file(flags_file, true,
3906 cur_cmd_args->ignoreUnrecognized)) {
3907 return JNI_EINVAL;
3908 }
3909 } else {
3910 #ifdef ASSERT
3911 // Parse default .hotspotrc settings file
3912 if (!process_settings_file(".hotspotrc", false,
3913 cur_cmd_args->ignoreUnrecognized)) {
3914 return JNI_EINVAL;
3915 }
3916 #else
3917 struct stat buf;
3918 if (os::stat(hotspotrc, &buf) == 0) {
3919 needs_hotspotrc_warning = true;
3920 }
3921 #endif
3922 }
3923
3924 if (PrintVMOptions) {
3925 print_options(cur_java_tool_options_args);
3926 print_options(cur_cmd_args);
3927 print_options(cur_java_options_args);
3928 }
3929
3930 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3931 jint result = parse_vm_init_args(cur_vm_options_args,
3932 cur_java_tool_options_args,
3933 cur_java_options_args,
3934 cur_cmd_args);
3935
3936 if (result != JNI_OK) {
3937 return result;
3938 }
3939
3940 #if INCLUDE_CDS
3941 // Initialize shared archive paths which could include both base and dynamic archive paths
3942 if (!init_shared_archive_paths()) {
3943 return JNI_ENOMEM;
3944 }
3945 #endif
3946
3947 // Delay warning until here so that we've had a chance to process
3948 // the -XX:-PrintWarnings flag
3949 if (needs_hotspotrc_warning) {
3950 warning("%s file is present but has been ignored. "
3951 "Run with -XX:Flags=%s to load the file.",
3952 hotspotrc, hotspotrc);
3953 }
3954
3955 if (needs_module_property_warning) {
3956 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3957 " names that are reserved for internal use.");
3958 }
3959
3960 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3961 UNSUPPORTED_OPTION(UseLargePages);
3962 #endif
3963
3964 #if defined(AIX)
3965 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3966 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3967 #endif
3968
3969 #ifndef PRODUCT
3970 if (TraceBytecodesAt != 0) {
3971 TraceBytecodes = true;
3972 }
3973 if (CountCompiledCalls) {
3974 if (UseCounterDecay) {
3975 warning("UseCounterDecay disabled because CountCalls is set");
3976 UseCounterDecay = false;
3977 }
3978 }
3979 #endif // PRODUCT
3980
3981 if (ScavengeRootsInCode == 0) {
3982 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3983 warning("Forcing ScavengeRootsInCode non-zero");
3984 }
3985 ScavengeRootsInCode = 1;
3986 }
3987
3988 if (!handle_deprecated_print_gc_flags()) {
3989 return JNI_EINVAL;
3990 }
3991
3992 // Set object alignment values.
3993 set_object_alignment();
3994
3995 #if !INCLUDE_CDS
3996 if (DumpSharedSpaces || RequireSharedSpaces) {
3997 jio_fprintf(defaultStream::error_stream(),
3998 "Shared spaces are not supported in this VM\n");
3999 return JNI_ERR;
4000 }
4001 if (DumpLoadedClassList != NULL) {
4002 jio_fprintf(defaultStream::error_stream(),
4003 "DumpLoadedClassList is not supported in this VM\n");
4004 return JNI_ERR;
4005 }
4006 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4007 log_is_enabled(Info, cds)) {
4008 warning("Shared spaces are not supported in this VM");
4009 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4010 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4011 }
4012 no_shared_spaces("CDS Disabled");
4013 #endif // INCLUDE_CDS
4014
4015 #ifndef TIERED
4016 if (FLAG_IS_CMDLINE(CompilationMode)) {
4017 warning("CompilationMode has no effect in non-tiered VMs");
4018 }
4019 #endif
4020
4021 return JNI_OK;
4022 }
4023
4024 jint Arguments::apply_ergo() {
4025 // Set flags based on ergonomics.
4026 jint result = set_ergonomics_flags();
4027 if (result != JNI_OK) return result;
4028
4029 // Set heap size based on available physical memory
4030 set_heap_size();
4031
4032 GCConfig::arguments()->initialize();
4033
4034 set_shared_spaces_flags();
4035
4036 // Initialize Metaspace flags and alignments
4037 Metaspace::ergo_initialize();
4038
4039 // Set compiler flags after GC is selected and GC specific
4040 // flags (LoopStripMiningIter) are set.
4041 CompilerConfig::ergo_initialize();
4042
4043 // Set bytecode rewriting flags
4044 set_bytecode_flags();
4045
4046 // Set flags if aggressive optimization flags are enabled
4047 jint code = set_aggressive_opts_flags();
4048 if (code != JNI_OK) {
4049 return code;
4050 }
4051
4052 // Turn off biased locking for locking debug mode flags,
4053 // which are subtly different from each other but neither works with
4054 // biased locking
4055 if (UseHeavyMonitors
4056 #ifdef COMPILER1
4057 || !UseFastLocking
4058 #endif // COMPILER1
4059 #if INCLUDE_JVMCI
4060 || !JVMCIUseFastLocking
4061 #endif
4062 ) {
4063 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4064 // flag set to true on command line; warn the user that they
4065 // can't enable biased locking here
4066 warning("Biased Locking is not supported with locking debug flags"
4067 "; ignoring UseBiasedLocking flag." );
4068 }
4069 UseBiasedLocking = false;
4070 }
4071
4072 #ifdef CC_INTERP
4073 // Clear flags not supported on zero.
4074 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4075 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4076 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4077 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4078 #endif // CC_INTERP
4079
4080 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4081 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4082 DebugNonSafepoints = true;
4083 }
4084
4085 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4086 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4087 }
4088
4089 // Treat the odd case where local verification is enabled but remote
4090 // verification is not as if both were enabled.
4091 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4092 log_info(verification)("Turning on remote verification because local verification is on");
4093 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4094 }
4095
4096 #ifndef PRODUCT
4097 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4098 if (use_vm_log()) {
4099 LogVMOutput = true;
4100 }
4101 }
4102 #endif // PRODUCT
4103
4104 if (PrintCommandLineFlags) {
4105 JVMFlag::printSetFlags(tty);
4106 }
4107
4108 // Apply CPU specific policy for the BiasedLocking
4109 if (UseBiasedLocking) {
4110 if (!VM_Version::use_biased_locking() &&
4111 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4112 UseBiasedLocking = false;
4113 }
4114 }
4115 #ifdef COMPILER2
4116 if (!UseBiasedLocking) {
4117 UseOptoBiasInlining = false;
4118 }
4119 #endif
4120
4121 return JNI_OK;
4122 }
4123
4124 jint Arguments::adjust_after_os() {
4125 if (UseNUMA) {
4126 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4127 FLAG_SET_ERGO(UseNUMA, false);
4128 } else if (UseParallelGC || UseParallelOldGC) {
4129 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4130 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4131 }
4132 }
4133 // UseNUMAInterleaving is set to ON for all collectors and platforms when
4134 // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and
4135 // survivor spaces on top of NUMA allocation policy for the eden space.
4136 // Non NUMA-aware collectors will interleave all of the heap spaces across
4137 // NUMA nodes.
4138 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4139 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4140 }
4141 }
4142 return JNI_OK;
4143 }
4144
4145 int Arguments::PropertyList_count(SystemProperty* pl) {
4146 int count = 0;
4147 while(pl != NULL) {
4148 count++;
4149 pl = pl->next();
4150 }
4151 return count;
4152 }
4153
4154 // Return the number of readable properties.
4155 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4156 int count = 0;
4157 while(pl != NULL) {
4158 if (pl->is_readable()) {
4159 count++;
4160 }
4161 pl = pl->next();
4162 }
4163 return count;
4164 }
4165
4166 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4167 assert(key != NULL, "just checking");
4168 SystemProperty* prop;
4169 for (prop = pl; prop != NULL; prop = prop->next()) {
4170 if (strcmp(key, prop->key()) == 0) return prop->value();
4171 }
4172 return NULL;
4173 }
4174
4175 // Return the value of the requested property provided that it is a readable property.
4176 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4177 assert(key != NULL, "just checking");
4178 SystemProperty* prop;
4179 // Return the property value if the keys match and the property is not internal or
4180 // it's the special internal property "jdk.boot.class.path.append".
4181 for (prop = pl; prop != NULL; prop = prop->next()) {
4182 if (strcmp(key, prop->key()) == 0) {
4183 if (!prop->internal()) {
4184 return prop->value();
4185 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4186 return prop->value();
4187 } else {
4188 // Property is internal and not jdk.boot.class.path.append so return NULL.
4189 return NULL;
4190 }
4191 }
4192 }
4193 return NULL;
4194 }
4195
4196 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4197 int count = 0;
4198 const char* ret_val = NULL;
4199
4200 while(pl != NULL) {
4201 if(count >= index) {
4202 ret_val = pl->key();
4203 break;
4204 }
4205 count++;
4206 pl = pl->next();
4207 }
4208
4209 return ret_val;
4210 }
4211
4212 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4213 int count = 0;
4214 char* ret_val = NULL;
4215
4216 while(pl != NULL) {
4217 if(count >= index) {
4218 ret_val = pl->value();
4219 break;
4220 }
4221 count++;
4222 pl = pl->next();
4223 }
4224
4225 return ret_val;
4226 }
4227
4228 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4229 SystemProperty* p = *plist;
4230 if (p == NULL) {
4231 *plist = new_p;
4232 } else {
4233 while (p->next() != NULL) {
4234 p = p->next();
4235 }
4236 p->set_next(new_p);
4237 }
4238 }
4239
4240 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4241 bool writeable, bool internal) {
4242 if (plist == NULL)
4243 return;
4244
4245 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4246 PropertyList_add(plist, new_p);
4247 }
4248
4249 void Arguments::PropertyList_add(SystemProperty *element) {
4250 PropertyList_add(&_system_properties, element);
4251 }
4252
4253 // This add maintains unique property key in the list.
4254 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4255 PropertyAppendable append, PropertyWriteable writeable,
4256 PropertyInternal internal) {
4257 if (plist == NULL)
4258 return;
4259
4260 // If property key exist then update with new value.
4261 SystemProperty* prop;
4262 for (prop = *plist; prop != NULL; prop = prop->next()) {
4263 if (strcmp(k, prop->key()) == 0) {
4264 if (append == AppendProperty) {
4265 prop->append_value(v);
4266 } else {
4267 prop->set_value(v);
4268 }
4269 return;
4270 }
4271 }
4272
4273 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4274 }
4275
4276 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4277 // Returns true if all of the source pointed by src has been copied over to
4278 // the destination buffer pointed by buf. Otherwise, returns false.
4279 // Notes:
4280 // 1. If the length (buflen) of the destination buffer excluding the
4281 // NULL terminator character is not long enough for holding the expanded
4282 // pid characters, it also returns false instead of returning the partially
4283 // expanded one.
4284 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4285 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4286 char* buf, size_t buflen) {
4287 const char* p = src;
4288 char* b = buf;
4289 const char* src_end = &src[srclen];
4290 char* buf_end = &buf[buflen - 1];
4291
4292 while (p < src_end && b < buf_end) {
4293 if (*p == '%') {
4294 switch (*(++p)) {
4295 case '%': // "%%" ==> "%"
4296 *b++ = *p++;
4297 break;
4298 case 'p': { // "%p" ==> current process id
4299 // buf_end points to the character before the last character so
4300 // that we could write '\0' to the end of the buffer.
4301 size_t buf_sz = buf_end - b + 1;
4302 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4303
4304 // if jio_snprintf fails or the buffer is not long enough to hold
4305 // the expanded pid, returns false.
4306 if (ret < 0 || ret >= (int)buf_sz) {
4307 return false;
4308 } else {
4309 b += ret;
4310 assert(*b == '\0', "fail in copy_expand_pid");
4311 if (p == src_end && b == buf_end + 1) {
4312 // reach the end of the buffer.
4313 return true;
4314 }
4315 }
4316 p++;
4317 break;
4318 }
4319 default :
4320 *b++ = '%';
4321 }
4322 } else {
4323 *b++ = *p++;
4324 }
4325 }
4326 *b = '\0';
4327 return (p == src_end); // return false if not all of the source was copied
4328 }