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 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
553 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
554 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
555 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
556 #endif
557
558 { NULL, JDK_Version(0), JDK_Version(0) }
559 };
560
561 // Flags that are aliases for other flags.
562 typedef struct {
563 const char* alias_name;
564 const char* real_name;
565 } AliasedFlag;
566
567 static AliasedFlag const aliased_jvm_flags[] = {
568 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
569 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
570 { NULL, NULL}
571 };
572
573 // NOTE: A compatibility request will be necessary for each alias to be removed.
574 static AliasedLoggingFlag const aliased_logging_flags[] = {
575 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
576 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
577 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
578 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
579 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
580 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
581 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
582 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
583 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
584 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
585 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
586 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
587 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
588 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
589 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
590 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
591 };
592
593 #ifndef PRODUCT
594 // These options are removed in jdk9. Remove this code for jdk10.
595 static AliasedFlag const removed_develop_logging_flags[] = {
596 { "TraceClassInitialization", "-Xlog:class+init" },
597 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
598 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
599 { "TraceItables", "-Xlog:itables=debug" },
600 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
601 { "TraceSafepoint", "-Xlog:safepoint=debug" },
602 { "TraceStartupTime", "-Xlog:startuptime" },
603 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
604 { "PrintVtables", "-Xlog:vtables=debug" },
605 { "VerboseVerification", "-Xlog:verification" },
606 { NULL, NULL }
607 };
608 #endif //PRODUCT
609
610 // Return true if "v" is less than "other", where "other" may be "undefined".
611 static bool version_less_than(JDK_Version v, JDK_Version other) {
612 assert(!v.is_undefined(), "must be defined");
613 if (!other.is_undefined() && v.compare(other) >= 0) {
614 return false;
615 } else {
616 return true;
617 }
618 }
619
620 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
621 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
622 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
623 flag = special_jvm_flags[i];
624 return true;
625 }
626 }
627 return false;
628 }
629
630 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
631 assert(version != NULL, "Must provide a version buffer");
632 SpecialFlag flag;
633 if (lookup_special_flag(flag_name, flag)) {
634 if (!flag.obsolete_in.is_undefined()) {
635 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
636 *version = flag.obsolete_in;
637 // This flag may have been marked for obsoletion in this version, but we may not
638 // have actually removed it yet. Rather than ignoring it as soon as we reach
639 // this version we allow some time for the removal to happen. So if the flag
640 // still actually exists we process it as normal, but issue an adjusted warning.
641 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
642 if (real_flag != NULL) {
643 char version_str[256];
644 version->to_string(version_str, sizeof(version_str));
645 warning("Temporarily processing option %s; support is scheduled for removal in %s",
646 flag_name, version_str);
647 return false;
648 }
649 return true;
650 }
651 }
652 }
653 return false;
654 }
655
656 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
657 assert(version != NULL, "Must provide a version buffer");
658 SpecialFlag flag;
659 if (lookup_special_flag(flag_name, flag)) {
660 if (!flag.deprecated_in.is_undefined()) {
661 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
662 version_less_than(JDK_Version::current(), flag.expired_in)) {
663 *version = flag.deprecated_in;
664 return 1;
665 } else {
666 return -1;
667 }
668 }
669 }
670 return 0;
671 }
672
673 #ifndef PRODUCT
674 const char* Arguments::removed_develop_logging_flag_name(const char* name){
675 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
676 const AliasedFlag& flag = removed_develop_logging_flags[i];
677 if (strcmp(flag.alias_name, name) == 0) {
678 return flag.real_name;
679 }
680 }
681 return NULL;
682 }
683 #endif // PRODUCT
684
685 const char* Arguments::real_flag_name(const char *flag_name) {
686 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
687 const AliasedFlag& flag_status = aliased_jvm_flags[i];
688 if (strcmp(flag_status.alias_name, flag_name) == 0) {
689 return flag_status.real_name;
690 }
691 }
692 return flag_name;
693 }
694
695 #ifdef ASSERT
696 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
697 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
698 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
699 return true;
700 }
701 }
702 return false;
703 }
704
705 // Verifies the correctness of the entries in the special_jvm_flags table.
706 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
707 // version being earlier than the deprecation version, then a warning is issued
708 // and verification fails - by returning false. If it is detected that the table
709 // is out of date, with respect to the current version, then ideally a warning is issued
710 // but verification does not fail. This would allow the VM to operate when the version
711 // is first updated, without needing to update all the impacted flags at the
712 // same time. In practice we can't issue the warning as it occurs for every test and
713 // some tests are not prepared to handle unexpected output - see 8196739. So we don't
714 // check for an out of date table.
715 static bool verify_special_jvm_flags() {
716 bool success = true;
717 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
718 const SpecialFlag& flag = special_jvm_flags[i];
719 if (lookup_special_flag(flag.name, i)) {
720 warning("Duplicate special flag declaration \"%s\"", flag.name);
721 success = false;
722 }
723 if (flag.deprecated_in.is_undefined() &&
724 flag.obsolete_in.is_undefined()) {
725 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
726 success = false;
727 }
728
729 if (!flag.deprecated_in.is_undefined()) {
730 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
731 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
732 success = false;
733 }
734
735 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
736 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
737 success = false;
738 }
739 }
740
741 if (!flag.obsolete_in.is_undefined()) {
742 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
743 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
744 success = false;
745 }
746
747 } else if (!flag.expired_in.is_undefined()) {
748 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
749 success = false;
750 }
751
752 }
753 return success;
754 }
755 #endif
756
757 // Parses a size specification string.
758 bool Arguments::atojulong(const char *s, julong* result) {
759 julong n = 0;
760
761 // First char must be a digit. Don't allow negative numbers or leading spaces.
762 if (!isdigit(*s)) {
763 return false;
764 }
765
766 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
767 char* remainder;
768 errno = 0;
769 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
770 if (errno != 0) {
771 return false;
772 }
773
774 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
775 if (remainder == s || strlen(remainder) > 1) {
776 return false;
777 }
778
779 switch (*remainder) {
780 case 'T': case 't':
781 *result = n * G * K;
782 // Check for overflow.
783 if (*result/((julong)G * K) != n) return false;
784 return true;
785 case 'G': case 'g':
786 *result = n * G;
787 if (*result/G != n) return false;
788 return true;
789 case 'M': case 'm':
790 *result = n * M;
791 if (*result/M != n) return false;
792 return true;
793 case 'K': case 'k':
794 *result = n * K;
795 if (*result/K != n) return false;
796 return true;
797 case '\0':
798 *result = n;
799 return true;
800 default:
801 return false;
802 }
803 }
804
805 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
806 if (size < min_size) return arg_too_small;
807 if (size > max_size) return arg_too_big;
808 return arg_in_range;
809 }
810
811 // Describe an argument out of range error
812 void Arguments::describe_range_error(ArgsRange errcode) {
813 switch(errcode) {
814 case arg_too_big:
815 jio_fprintf(defaultStream::error_stream(),
816 "The specified size exceeds the maximum "
817 "representable size.\n");
818 break;
819 case arg_too_small:
820 case arg_unreadable:
821 case arg_in_range:
822 // do nothing for now
823 break;
824 default:
825 ShouldNotReachHere();
826 }
827 }
828
829 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
830 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
831 return true;
832 } else {
833 return false;
834 }
835 }
836
837 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
838 char* end;
839 errno = 0;
840 double v = strtod(value, &end);
841 if ((errno != 0) || (*end != 0)) {
842 return false;
843 }
844
845 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
846 return true;
847 }
848 return false;
849 }
850
851 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
852 julong v;
853 int int_v;
854 intx intx_v;
855 bool is_neg = false;
856
857 if (flag == NULL) {
858 return false;
859 }
860
861 // Check the sign first since atojulong() parses only unsigned values.
862 if (*value == '-') {
863 if (!flag->is_intx() && !flag->is_int()) {
864 return false;
865 }
866 value++;
867 is_neg = true;
868 }
869 if (!Arguments::atojulong(value, &v)) {
870 return false;
871 }
872 if (flag->is_int()) {
873 int_v = (int) v;
874 if (is_neg) {
875 int_v = -int_v;
876 }
877 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
878 } else if (flag->is_uint()) {
879 uint uint_v = (uint) v;
880 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
881 } else if (flag->is_intx()) {
882 intx_v = (intx) v;
883 if (is_neg) {
884 intx_v = -intx_v;
885 }
886 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
887 } else if (flag->is_uintx()) {
888 uintx uintx_v = (uintx) v;
889 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
890 } else if (flag->is_uint64_t()) {
891 uint64_t uint64_t_v = (uint64_t) v;
892 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
893 } else if (flag->is_size_t()) {
894 size_t size_t_v = (size_t) v;
895 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
896 } else if (flag->is_double()) {
897 double double_v = (double) v;
898 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
899 } else {
900 return false;
901 }
902 }
903
904 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
905 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
906 // Contract: JVMFlag always returns a pointer that needs freeing.
907 FREE_C_HEAP_ARRAY(char, value);
908 return true;
909 }
910
911 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
912 const char* old_value = "";
913 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
914 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
915 size_t new_len = strlen(new_value);
916 const char* value;
917 char* free_this_too = NULL;
918 if (old_len == 0) {
919 value = new_value;
920 } else if (new_len == 0) {
921 value = old_value;
922 } else {
923 size_t length = old_len + 1 + new_len + 1;
924 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
925 // each new setting adds another LINE to the switch:
926 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
927 value = buf;
928 free_this_too = buf;
929 }
930 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
931 // JVMFlag always returns a pointer that needs freeing.
932 FREE_C_HEAP_ARRAY(char, value);
933 // JVMFlag made its own copy, so I must delete my own temp. buffer.
934 FREE_C_HEAP_ARRAY(char, free_this_too);
935 return true;
936 }
937
938 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
939 const char* real_name = real_flag_name(arg);
940 JDK_Version since = JDK_Version();
941 switch (is_deprecated_flag(arg, &since)) {
942 case -1: {
943 // Obsolete or expired, so don't process normally,
944 // but allow for an obsolete flag we're still
945 // temporarily allowing.
946 if (!is_obsolete_flag(arg, &since)) {
947 return real_name;
948 }
949 // Note if we're not considered obsolete then we can't be expired either
950 // as obsoletion must come first.
951 return NULL;
952 }
953 case 0:
954 return real_name;
955 case 1: {
956 if (warn) {
957 char version[256];
958 since.to_string(version, sizeof(version));
959 if (real_name != arg) {
960 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
961 arg, version, real_name);
962 } else {
963 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
964 arg, version);
965 }
966 }
967 return real_name;
968 }
969 }
970 ShouldNotReachHere();
971 return NULL;
972 }
973
974 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
975 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
976 // Set tagset string buffer at max size of 256, large enough for any alias tagset
977 const int max_tagset_size = 256;
978 int max_tagset_len = max_tagset_size - 1;
979 char tagset_buffer[max_tagset_size];
980 tagset_buffer[0] = '\0';
981
982 // Write tag-set for aliased logging option, in string list form
983 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
984 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
985 if (i > 0) {
986 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
987 }
988 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
989 }
990 if (!alf.exactMatch) {
991 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
992 }
993 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
994 (on) ? "+" : "-",
995 name,
996 tagset_buffer,
997 (on) ? LogLevel::name(alf.level) : "off");
998 }
999
1000 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1001 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1002 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1003 if (strcmp(alf.alias_name, name) == 0) {
1004 log_deprecated_flag(name, on, alf);
1005 return alf;
1006 }
1007 }
1008 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1009 return a;
1010 }
1011
1012 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1013
1014 // range of acceptable characters spelled out for portability reasons
1015 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1016 #define BUFLEN 255
1017 char name[BUFLEN+1];
1018 char dummy;
1019 const char* real_name;
1020 bool warn_if_deprecated = true;
1021
1022 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1023 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1024 if (alf.alias_name != NULL){
1025 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1026 return true;
1027 }
1028 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1029 if (real_name == NULL) {
1030 return false;
1031 }
1032 JVMFlag* flag = JVMFlag::find_flag(real_name);
1033 return set_bool_flag(flag, false, origin);
1034 }
1035 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1036 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1037 if (alf.alias_name != NULL){
1038 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1039 return true;
1040 }
1041 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1042 if (real_name == NULL) {
1043 return false;
1044 }
1045 JVMFlag* flag = JVMFlag::find_flag(real_name);
1046 return set_bool_flag(flag, true, origin);
1047 }
1048
1049 char punct;
1050 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1051 const char* value = strchr(arg, '=') + 1;
1052
1053 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1054 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1055 if (alf.alias_name != NULL) {
1056 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1057 return true;
1058 }
1059 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1060 if (real_name == NULL) {
1061 return false;
1062 }
1063 JVMFlag* flag = JVMFlag::find_flag(real_name);
1064 if (flag != NULL && flag->is_ccstr()) {
1065 if (flag->ccstr_accumulates()) {
1066 return append_to_string_flag(flag, value, origin);
1067 } else {
1068 if (value[0] == '\0') {
1069 value = NULL;
1070 }
1071 return set_string_flag(flag, value, origin);
1072 }
1073 } else {
1074 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1075 }
1076 }
1077
1078 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1079 const char* value = strchr(arg, '=') + 1;
1080 // -XX:Foo:=xxx will reset the string flag to the given value.
1081 if (value[0] == '\0') {
1082 value = NULL;
1083 }
1084 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1085 if (real_name == NULL) {
1086 return false;
1087 }
1088 JVMFlag* flag = JVMFlag::find_flag(real_name);
1089 return set_string_flag(flag, value, origin);
1090 }
1091
1092 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1093 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1094 #define NUMBER_RANGE "[0123456789eE+-]"
1095 char value[BUFLEN + 1];
1096 char value2[BUFLEN + 1];
1097 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1098 // Looks like a floating-point number -- try again with more lenient format string
1099 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1100 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1101 if (real_name == NULL) {
1102 return false;
1103 }
1104 JVMFlag* flag = JVMFlag::find_flag(real_name);
1105 return set_fp_numeric_flag(flag, value, origin);
1106 }
1107 }
1108
1109 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1110 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1111 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1112 if (real_name == NULL) {
1113 return false;
1114 }
1115 JVMFlag* flag = JVMFlag::find_flag(real_name);
1116 return set_numeric_flag(flag, value, origin);
1117 }
1118
1119 return false;
1120 }
1121
1122 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1123 assert(bldarray != NULL, "illegal argument");
1124
1125 if (arg == NULL) {
1126 return;
1127 }
1128
1129 int new_count = *count + 1;
1130
1131 // expand the array and add arg to the last element
1132 if (*bldarray == NULL) {
1133 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1134 } else {
1135 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1136 }
1137 (*bldarray)[*count] = os::strdup_check_oom(arg);
1138 *count = new_count;
1139 }
1140
1141 void Arguments::build_jvm_args(const char* arg) {
1142 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1143 }
1144
1145 void Arguments::build_jvm_flags(const char* arg) {
1146 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1147 }
1148
1149 // utility function to return a string that concatenates all
1150 // strings in a given char** array
1151 const char* Arguments::build_resource_string(char** args, int count) {
1152 if (args == NULL || count == 0) {
1153 return NULL;
1154 }
1155 size_t length = 0;
1156 for (int i = 0; i < count; i++) {
1157 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1158 }
1159 char* s = NEW_RESOURCE_ARRAY(char, length);
1160 char* dst = s;
1161 for (int j = 0; j < count; j++) {
1162 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1163 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1164 dst += offset;
1165 length -= offset;
1166 }
1167 return (const char*) s;
1168 }
1169
1170 void Arguments::print_on(outputStream* st) {
1171 st->print_cr("VM Arguments:");
1172 if (num_jvm_flags() > 0) {
1173 st->print("jvm_flags: "); print_jvm_flags_on(st);
1174 st->cr();
1175 }
1176 if (num_jvm_args() > 0) {
1177 st->print("jvm_args: "); print_jvm_args_on(st);
1178 st->cr();
1179 }
1180 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1181 if (_java_class_path != NULL) {
1182 char* path = _java_class_path->value();
1183 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1184 }
1185 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1186 }
1187
1188 void Arguments::print_summary_on(outputStream* st) {
1189 // Print the command line. Environment variables that are helpful for
1190 // reproducing the problem are written later in the hs_err file.
1191 // flags are from setting file
1192 if (num_jvm_flags() > 0) {
1193 st->print_raw("Settings File: ");
1194 print_jvm_flags_on(st);
1195 st->cr();
1196 }
1197 // args are the command line and environment variable arguments.
1198 st->print_raw("Command Line: ");
1199 if (num_jvm_args() > 0) {
1200 print_jvm_args_on(st);
1201 }
1202 // this is the classfile and any arguments to the java program
1203 if (java_command() != NULL) {
1204 st->print("%s", java_command());
1205 }
1206 st->cr();
1207 }
1208
1209 void Arguments::print_jvm_flags_on(outputStream* st) {
1210 if (_num_jvm_flags > 0) {
1211 for (int i=0; i < _num_jvm_flags; i++) {
1212 st->print("%s ", _jvm_flags_array[i]);
1213 }
1214 }
1215 }
1216
1217 void Arguments::print_jvm_args_on(outputStream* st) {
1218 if (_num_jvm_args > 0) {
1219 for (int i=0; i < _num_jvm_args; i++) {
1220 st->print("%s ", _jvm_args_array[i]);
1221 }
1222 }
1223 }
1224
1225 bool Arguments::process_argument(const char* arg,
1226 jboolean ignore_unrecognized,
1227 JVMFlag::Flags origin) {
1228 JDK_Version since = JDK_Version();
1229
1230 if (parse_argument(arg, origin)) {
1231 return true;
1232 }
1233
1234 // Determine if the flag has '+', '-', or '=' characters.
1235 bool has_plus_minus = (*arg == '+' || *arg == '-');
1236 const char* const argname = has_plus_minus ? arg + 1 : arg;
1237
1238 size_t arg_len;
1239 const char* equal_sign = strchr(argname, '=');
1240 if (equal_sign == NULL) {
1241 arg_len = strlen(argname);
1242 } else {
1243 arg_len = equal_sign - argname;
1244 }
1245
1246 // Only make the obsolete check for valid arguments.
1247 if (arg_len <= BUFLEN) {
1248 // Construct a string which consists only of the argument name without '+', '-', or '='.
1249 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1250 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1251 if (is_obsolete_flag(stripped_argname, &since)) {
1252 char version[256];
1253 since.to_string(version, sizeof(version));
1254 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1255 return true;
1256 }
1257 #ifndef PRODUCT
1258 else {
1259 const char* replacement;
1260 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1261 log_warning(arguments)("%s has been removed. Please use %s instead.",
1262 stripped_argname,
1263 replacement);
1264 return false;
1265 }
1266 }
1267 #endif //PRODUCT
1268 }
1269
1270 // For locked flags, report a custom error message if available.
1271 // Otherwise, report the standard unrecognized VM option.
1272 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1273 if (found_flag != NULL) {
1274 char locked_message_buf[BUFLEN];
1275 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1276 if (strlen(locked_message_buf) == 0) {
1277 if (found_flag->is_bool() && !has_plus_minus) {
1278 jio_fprintf(defaultStream::error_stream(),
1279 "Missing +/- setting for VM option '%s'\n", argname);
1280 } else if (!found_flag->is_bool() && has_plus_minus) {
1281 jio_fprintf(defaultStream::error_stream(),
1282 "Unexpected +/- setting in VM option '%s'\n", argname);
1283 } else {
1284 jio_fprintf(defaultStream::error_stream(),
1285 "Improperly specified VM option '%s'\n", argname);
1286 }
1287 } else {
1288 #ifdef PRODUCT
1289 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1290 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1291 if (ignore_unrecognized && mismatched) {
1292 return true;
1293 }
1294 #endif
1295 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1296 }
1297 } else {
1298 if (ignore_unrecognized) {
1299 return true;
1300 }
1301 jio_fprintf(defaultStream::error_stream(),
1302 "Unrecognized VM option '%s'\n", argname);
1303 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1304 if (fuzzy_matched != NULL) {
1305 jio_fprintf(defaultStream::error_stream(),
1306 "Did you mean '%s%s%s'? ",
1307 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1308 fuzzy_matched->_name,
1309 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1310 }
1311 }
1312
1313 // allow for commandline "commenting out" options like -XX:#+Verbose
1314 return arg[0] == '#';
1315 }
1316
1317 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1318 FILE* stream = fopen(file_name, "rb");
1319 if (stream == NULL) {
1320 if (should_exist) {
1321 jio_fprintf(defaultStream::error_stream(),
1322 "Could not open settings file %s\n", file_name);
1323 return false;
1324 } else {
1325 return true;
1326 }
1327 }
1328
1329 char token[1024];
1330 int pos = 0;
1331
1332 bool in_white_space = true;
1333 bool in_comment = false;
1334 bool in_quote = false;
1335 char quote_c = 0;
1336 bool result = true;
1337
1338 int c = getc(stream);
1339 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1340 if (in_white_space) {
1341 if (in_comment) {
1342 if (c == '\n') in_comment = false;
1343 } else {
1344 if (c == '#') in_comment = true;
1345 else if (!isspace(c)) {
1346 in_white_space = false;
1347 token[pos++] = c;
1348 }
1349 }
1350 } else {
1351 if (c == '\n' || (!in_quote && isspace(c))) {
1352 // token ends at newline, or at unquoted whitespace
1353 // this allows a way to include spaces in string-valued options
1354 token[pos] = '\0';
1355 logOption(token);
1356 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1357 build_jvm_flags(token);
1358 pos = 0;
1359 in_white_space = true;
1360 in_quote = false;
1361 } else if (!in_quote && (c == '\'' || c == '"')) {
1362 in_quote = true;
1363 quote_c = c;
1364 } else if (in_quote && (c == quote_c)) {
1365 in_quote = false;
1366 } else {
1367 token[pos++] = c;
1368 }
1369 }
1370 c = getc(stream);
1371 }
1372 if (pos > 0) {
1373 token[pos] = '\0';
1374 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1375 build_jvm_flags(token);
1376 }
1377 fclose(stream);
1378 return result;
1379 }
1380
1381 //=============================================================================================================
1382 // Parsing of properties (-D)
1383
1384 const char* Arguments::get_property(const char* key) {
1385 return PropertyList_get_value(system_properties(), key);
1386 }
1387
1388 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1389 const char* eq = strchr(prop, '=');
1390 const char* key;
1391 const char* value = "";
1392
1393 if (eq == NULL) {
1394 // property doesn't have a value, thus use passed string
1395 key = prop;
1396 } else {
1397 // property have a value, thus extract it and save to the
1398 // allocated string
1399 size_t key_len = eq - prop;
1400 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1401
1402 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1403 key = tmp_key;
1404
1405 value = &prop[key_len + 1];
1406 }
1407
1408 if (strcmp(key, "java.compiler") == 0) {
1409 process_java_compiler_argument(value);
1410 // Record value in Arguments, but let it get passed to Java.
1411 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1412 // sun.java.launcher.is_altjvm property is
1413 // private and is processed in process_sun_java_launcher_properties();
1414 // the sun.java.launcher property is passed on to the java application
1415 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1416 // append is true, writable is true, internal is false
1417 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1418 WriteableProperty, ExternalProperty);
1419 } else {
1420 if (strcmp(key, "sun.java.command") == 0) {
1421 char *old_java_command = _java_command;
1422 _java_command = os::strdup_check_oom(value, mtArguments);
1423 if (old_java_command != NULL) {
1424 os::free(old_java_command);
1425 }
1426 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1427 // If this property is set on the command line then its value will be
1428 // displayed in VM error logs as the URL at which to submit such logs.
1429 // Normally the URL displayed in error logs is different from the value
1430 // of this system property, so a different property should have been
1431 // used here, but we leave this as-is in case someone depends upon it.
1432 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1433 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1434 // its value without going through the property list or making a Java call.
1435 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1436 if (old_java_vendor_url_bug != NULL) {
1437 os::free((void *)old_java_vendor_url_bug);
1438 }
1439 }
1440
1441 // Create new property and add at the end of the list
1442 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1443 }
1444
1445 if (key != prop) {
1446 // SystemProperty copy passed value, thus free previously allocated
1447 // memory
1448 FreeHeap((void *)key);
1449 }
1450
1451 return true;
1452 }
1453
1454 #if INCLUDE_CDS
1455 const char* unsupported_properties[] = { "jdk.module.limitmods",
1456 "jdk.module.upgrade.path",
1457 "jdk.module.patch.0" };
1458 const char* unsupported_options[] = { "--limit-modules",
1459 "--upgrade-module-path",
1460 "--patch-module"
1461 };
1462 void Arguments::check_unsupported_dumping_properties() {
1463 assert(is_dumping_archive(),
1464 "this function is only used with CDS dump time");
1465 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1466 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1467 SystemProperty* sp = system_properties();
1468 while (sp != NULL) {
1469 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1470 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1471 vm_exit_during_initialization(
1472 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1473 }
1474 }
1475 sp = sp->next();
1476 }
1477
1478 // Check for an exploded module build in use with -Xshare:dump.
1479 if (!has_jimage()) {
1480 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1481 }
1482 }
1483
1484 bool Arguments::check_unsupported_cds_runtime_properties() {
1485 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1486 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1487 if (ArchiveClassesAtExit != NULL) {
1488 // dynamic dumping, just return false for now.
1489 // check_unsupported_dumping_properties() will be called later to check the same set of
1490 // properties, and will exit the VM with the correct error message if the unsupported properties
1491 // are used.
1492 return false;
1493 }
1494 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1495 if (get_property(unsupported_properties[i]) != NULL) {
1496 if (RequireSharedSpaces) {
1497 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1498 }
1499 return true;
1500 }
1501 }
1502 return false;
1503 }
1504 #endif
1505
1506 //===========================================================================================================
1507 // Setting int/mixed/comp mode flags
1508
1509 void Arguments::set_mode_flags(Mode mode) {
1510 // Set up default values for all flags.
1511 // If you add a flag to any of the branches below,
1512 // add a default value for it here.
1513 set_java_compiler(false);
1514 _mode = mode;
1515
1516 // Ensure Agent_OnLoad has the correct initial values.
1517 // This may not be the final mode; mode may change later in onload phase.
1518 PropertyList_unique_add(&_system_properties, "java.vm.info",
1519 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1520
1521 UseInterpreter = true;
1522 UseCompiler = true;
1523 UseLoopCounter = true;
1524
1525 // Default values may be platform/compiler dependent -
1526 // use the saved values
1527 ClipInlining = Arguments::_ClipInlining;
1528 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1529 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1530 BackgroundCompilation = Arguments::_BackgroundCompilation;
1531 if (TieredCompilation) {
1532 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1533 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1534 }
1535 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1536 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1537 }
1538 }
1539
1540 // Change from defaults based on mode
1541 switch (mode) {
1542 default:
1543 ShouldNotReachHere();
1544 break;
1545 case _int:
1546 UseCompiler = false;
1547 UseLoopCounter = false;
1548 AlwaysCompileLoopMethods = false;
1549 UseOnStackReplacement = false;
1550 break;
1551 case _mixed:
1552 // same as default
1553 break;
1554 case _comp:
1555 UseInterpreter = false;
1556 BackgroundCompilation = false;
1557 ClipInlining = false;
1558 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1559 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1560 // compile a level 4 (C2) and then continue executing it.
1561 if (TieredCompilation) {
1562 Tier3InvokeNotifyFreqLog = 0;
1563 Tier4InvocationThreshold = 0;
1564 }
1565 break;
1566 }
1567 }
1568
1569 // Conflict: required to use shared spaces (-Xshare:on), but
1570 // incompatible command line options were chosen.
1571 static void no_shared_spaces(const char* message) {
1572 if (RequireSharedSpaces) {
1573 jio_fprintf(defaultStream::error_stream(),
1574 "Class data sharing is inconsistent with other specified options.\n");
1575 vm_exit_during_initialization("Unable to use shared archive", message);
1576 } else {
1577 log_info(cds)("Unable to use shared archive: %s", message);
1578 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1579 }
1580 }
1581
1582 void set_object_alignment() {
1583 // Object alignment.
1584 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1585 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1586 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1587 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1588 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1589 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1590
1591 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1592 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1593
1594 // Oop encoding heap max
1595 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1596
1597 if (SurvivorAlignmentInBytes == 0) {
1598 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1599 }
1600 }
1601
1602 size_t Arguments::max_heap_for_compressed_oops() {
1603 // Avoid sign flip.
1604 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1605 // We need to fit both the NULL page and the heap into the memory budget, while
1606 // keeping alignment constraints of the heap. To guarantee the latter, as the
1607 // NULL page is located before the heap, we pad the NULL page to the conservative
1608 // maximum alignment that the GC may ever impose upon the heap.
1609 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1610 _conservative_max_heap_alignment);
1611
1612 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1613 NOT_LP64(ShouldNotReachHere(); return 0);
1614 }
1615
1616 void Arguments::set_use_compressed_oops() {
1617 #ifndef ZERO
1618 #ifdef _LP64
1619 // MaxHeapSize is not set up properly at this point, but
1620 // the only value that can override MaxHeapSize if we are
1621 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1622 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1623
1624 if (max_heap_size <= max_heap_for_compressed_oops()) {
1625 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1626 FLAG_SET_ERGO(UseCompressedOops, true);
1627 }
1628 } else {
1629 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1630 warning("Max heap size too large for Compressed Oops");
1631 FLAG_SET_DEFAULT(UseCompressedOops, false);
1632 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1633 }
1634 }
1635 #endif // _LP64
1636 #endif // ZERO
1637 }
1638
1639
1640 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1641 // set_use_compressed_oops().
1642 void Arguments::set_use_compressed_klass_ptrs() {
1643 #ifndef ZERO
1644 #ifdef _LP64
1645 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1646 if (!UseCompressedOops) {
1647 if (UseCompressedClassPointers) {
1648 warning("UseCompressedClassPointers requires UseCompressedOops");
1649 }
1650 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1651 } else {
1652 // Turn on UseCompressedClassPointers too
1653 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1654 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1655 }
1656 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1657 if (UseCompressedClassPointers) {
1658 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1659 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1660 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1661 }
1662 }
1663 }
1664 #endif // _LP64
1665 #endif // !ZERO
1666 }
1667
1668 void Arguments::set_conservative_max_heap_alignment() {
1669 // The conservative maximum required alignment for the heap is the maximum of
1670 // the alignments imposed by several sources: any requirements from the heap
1671 // itself and the maximum page size we may run the VM with.
1672 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1673 _conservative_max_heap_alignment = MAX4(heap_alignment,
1674 (size_t)os::vm_allocation_granularity(),
1675 os::max_page_size(),
1676 GCArguments::compute_heap_alignment());
1677 }
1678
1679 jint Arguments::set_ergonomics_flags() {
1680 GCConfig::initialize();
1681
1682 set_conservative_max_heap_alignment();
1683
1684 #ifndef ZERO
1685 #ifdef _LP64
1686 set_use_compressed_oops();
1687
1688 // set_use_compressed_klass_ptrs() must be called after calling
1689 // set_use_compressed_oops().
1690 set_use_compressed_klass_ptrs();
1691
1692 // Also checks that certain machines are slower with compressed oops
1693 // in vm_version initialization code.
1694 #endif // _LP64
1695 #endif // !ZERO
1696
1697 return JNI_OK;
1698 }
1699
1700 julong Arguments::limit_by_allocatable_memory(julong limit) {
1701 julong max_allocatable;
1702 julong result = limit;
1703 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1704 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1705 }
1706 return result;
1707 }
1708
1709 // Use static initialization to get the default before parsing
1710 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1711
1712 void Arguments::set_heap_size() {
1713 julong phys_mem;
1714
1715 // If the user specified one of these options, they
1716 // want specific memory sizing so do not limit memory
1717 // based on compressed oops addressability.
1718 // Also, memory limits will be calculated based on
1719 // available os physical memory, not our MaxRAM limit,
1720 // unless MaxRAM is also specified.
1721 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1722 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1723 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1724 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1725 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1726 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1727 !FLAG_IS_DEFAULT(MaxRAM));
1728 if (override_coop_limit) {
1729 if (FLAG_IS_DEFAULT(MaxRAM)) {
1730 phys_mem = os::physical_memory();
1731 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1732 } else {
1733 phys_mem = (julong)MaxRAM;
1734 }
1735 } else {
1736 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1737 : (julong)MaxRAM;
1738 }
1739
1740
1741 // Convert deprecated flags
1742 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1743 !FLAG_IS_DEFAULT(MaxRAMFraction))
1744 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1745
1746 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1747 !FLAG_IS_DEFAULT(MinRAMFraction))
1748 MinRAMPercentage = 100.0 / MinRAMFraction;
1749
1750 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1751 !FLAG_IS_DEFAULT(InitialRAMFraction))
1752 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1753
1754 // If the maximum heap size has not been set with -Xmx,
1755 // then set it as fraction of the size of physical memory,
1756 // respecting the maximum and minimum sizes of the heap.
1757 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1758 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1759 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1760 if (reasonable_min < MaxHeapSize) {
1761 // Small physical memory, so use a minimum fraction of it for the heap
1762 reasonable_max = reasonable_min;
1763 } else {
1764 // Not-small physical memory, so require a heap at least
1765 // as large as MaxHeapSize
1766 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1767 }
1768
1769 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1770 // Limit the heap size to ErgoHeapSizeLimit
1771 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1772 }
1773
1774 #ifdef _LP64
1775 if (UseCompressedOops) {
1776 // Limit the heap size to the maximum possible when using compressed oops
1777 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1778
1779 // HeapBaseMinAddress can be greater than default but not less than.
1780 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1781 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1782 // matches compressed oops printing flags
1783 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1784 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1785 DefaultHeapBaseMinAddress,
1786 DefaultHeapBaseMinAddress/G,
1787 HeapBaseMinAddress);
1788 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1789 }
1790 }
1791
1792 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1793 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1794 // but it should be not less than default MaxHeapSize.
1795 max_coop_heap -= HeapBaseMinAddress;
1796 }
1797
1798 // If user specified flags prioritizing os physical
1799 // memory limits, then disable compressed oops if
1800 // limits exceed max_coop_heap and UseCompressedOops
1801 // was not specified.
1802 if (reasonable_max > max_coop_heap) {
1803 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1804 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1805 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1806 "Please check the setting of MaxRAMPercentage %5.2f."
1807 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1808 FLAG_SET_ERGO(UseCompressedOops, false);
1809 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1810 } else {
1811 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1812 }
1813 }
1814 }
1815 #endif // _LP64
1816
1817 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1818
1819 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1820 // An initial heap size was specified on the command line,
1821 // so be sure that the maximum size is consistent. Done
1822 // after call to limit_by_allocatable_memory because that
1823 // method might reduce the allocation size.
1824 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1825 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1826 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1827 }
1828
1829 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1830 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1831 }
1832
1833 // If the minimum or initial heap_size have not been set or requested to be set
1834 // ergonomically, set them accordingly.
1835 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1836 julong reasonable_minimum = (julong)(OldSize + NewSize);
1837
1838 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1839
1840 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1841
1842 if (InitialHeapSize == 0) {
1843 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1844
1845 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1846 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1847
1848 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1849
1850 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1851 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1852 }
1853 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1854 // synchronize with InitialHeapSize to avoid errors with the default value.
1855 if (MinHeapSize == 0) {
1856 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1857 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1858 }
1859 }
1860 }
1861
1862 // This option inspects the machine and attempts to set various
1863 // parameters to be optimal for long-running, memory allocation
1864 // intensive jobs. It is intended for machines with large
1865 // amounts of cpu and memory.
1866 jint Arguments::set_aggressive_heap_flags() {
1867 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1868 // VM, but we may not be able to represent the total physical memory
1869 // available (like having 8gb of memory on a box but using a 32bit VM).
1870 // Thus, we need to make sure we're using a julong for intermediate
1871 // calculations.
1872 julong initHeapSize;
1873 julong total_memory = os::physical_memory();
1874
1875 if (total_memory < (julong) 256 * M) {
1876 jio_fprintf(defaultStream::error_stream(),
1877 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1878 vm_exit(1);
1879 }
1880
1881 // The heap size is half of available memory, or (at most)
1882 // all of possible memory less 160mb (leaving room for the OS
1883 // when using ISM). This is the maximum; because adaptive sizing
1884 // is turned on below, the actual space used may be smaller.
1885
1886 initHeapSize = MIN2(total_memory / (julong) 2,
1887 total_memory - (julong) 160 * M);
1888
1889 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1890
1891 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1892 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1893 return JNI_EINVAL;
1894 }
1895 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1896 return JNI_EINVAL;
1897 }
1898 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1899 return JNI_EINVAL;
1900 }
1901 }
1902 if (FLAG_IS_DEFAULT(NewSize)) {
1903 // Make the young generation 3/8ths of the total heap.
1904 if (FLAG_SET_CMDLINE(NewSize,
1905 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1906 return JNI_EINVAL;
1907 }
1908 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1909 return JNI_EINVAL;
1910 }
1911 }
1912
1913 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1914 FLAG_SET_DEFAULT(UseLargePages, true);
1915 #endif
1916
1917 // Increase some data structure sizes for efficiency
1918 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1919 return JNI_EINVAL;
1920 }
1921 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1922 return JNI_EINVAL;
1923 }
1924 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1925 return JNI_EINVAL;
1926 }
1927
1928 // See the OldPLABSize comment below, but replace 'after promotion'
1929 // with 'after copying'. YoungPLABSize is the size of the survivor
1930 // space per-gc-thread buffers. The default is 4kw.
1931 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1932 return JNI_EINVAL;
1933 }
1934
1935 // OldPLABSize is the size of the buffers in the old gen that
1936 // UseParallelGC uses to promote live data that doesn't fit in the
1937 // survivor spaces. At any given time, there's one for each gc thread.
1938 // The default size is 1kw. These buffers are rarely used, since the
1939 // survivor spaces are usually big enough. For specjbb, however, there
1940 // are occasions when there's lots of live data in the young gen
1941 // and we end up promoting some of it. We don't have a definite
1942 // explanation for why bumping OldPLABSize helps, but the theory
1943 // is that a bigger PLAB results in retaining something like the
1944 // original allocation order after promotion, which improves mutator
1945 // locality. A minor effect may be that larger PLABs reduce the
1946 // number of PLAB allocation events during gc. The value of 8kw
1947 // was arrived at by experimenting with specjbb.
1948 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1949 return JNI_EINVAL;
1950 }
1951
1952 // Enable parallel GC and adaptive generation sizing
1953 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1954 return JNI_EINVAL;
1955 }
1956
1957 // Encourage steady state memory management
1958 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1959 return JNI_EINVAL;
1960 }
1961
1962 // This appears to improve mutator locality
1963 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1964 return JNI_EINVAL;
1965 }
1966
1967 return JNI_OK;
1968 }
1969
1970 // This must be called after ergonomics.
1971 void Arguments::set_bytecode_flags() {
1972 if (!RewriteBytecodes) {
1973 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1974 }
1975 }
1976
1977 // Aggressive optimization flags
1978 jint Arguments::set_aggressive_opts_flags() {
1979 #ifdef COMPILER2
1980 if (AggressiveUnboxing) {
1981 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1982 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1983 } else if (!EliminateAutoBox) {
1984 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1985 AggressiveUnboxing = false;
1986 }
1987 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1988 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1989 } else if (!DoEscapeAnalysis) {
1990 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1991 AggressiveUnboxing = false;
1992 }
1993 }
1994 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1995 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1996 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1997 }
1998 // Feed the cache size setting into the JDK
1999 char buffer[1024];
2000 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2001 if (!add_property(buffer)) {
2002 return JNI_ENOMEM;
2003 }
2004 }
2005 #endif
2006
2007 return JNI_OK;
2008 }
2009
2010 //===========================================================================================================
2011 // Parsing of java.compiler property
2012
2013 void Arguments::process_java_compiler_argument(const char* arg) {
2014 // For backwards compatibility, Djava.compiler=NONE or ""
2015 // causes us to switch to -Xint mode UNLESS -Xdebug
2016 // is also specified.
2017 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2018 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2019 }
2020 }
2021
2022 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2023 _sun_java_launcher = os::strdup_check_oom(launcher);
2024 }
2025
2026 bool Arguments::created_by_java_launcher() {
2027 assert(_sun_java_launcher != NULL, "property must have value");
2028 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2029 }
2030
2031 bool Arguments::sun_java_launcher_is_altjvm() {
2032 return _sun_java_launcher_is_altjvm;
2033 }
2034
2035 //===========================================================================================================
2036 // Parsing of main arguments
2037
2038 unsigned int addreads_count = 0;
2039 unsigned int addexports_count = 0;
2040 unsigned int addopens_count = 0;
2041 unsigned int addmods_count = 0;
2042 unsigned int patch_mod_count = 0;
2043
2044 // Check the consistency of vm_init_args
2045 bool Arguments::check_vm_args_consistency() {
2046 // Method for adding checks for flag consistency.
2047 // The intent is to warn the user of all possible conflicts,
2048 // before returning an error.
2049 // Note: Needs platform-dependent factoring.
2050 bool status = true;
2051
2052 if (TLABRefillWasteFraction == 0) {
2053 jio_fprintf(defaultStream::error_stream(),
2054 "TLABRefillWasteFraction should be a denominator, "
2055 "not " SIZE_FORMAT "\n",
2056 TLABRefillWasteFraction);
2057 status = false;
2058 }
2059
2060 if (PrintNMTStatistics) {
2061 #if INCLUDE_NMT
2062 if (MemTracker::tracking_level() == NMT_off) {
2063 #endif // INCLUDE_NMT
2064 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2065 PrintNMTStatistics = false;
2066 #if INCLUDE_NMT
2067 }
2068 #endif
2069 }
2070
2071 status = CompilerConfig::check_args_consistency(status);
2072 #if INCLUDE_JVMCI
2073 if (status && EnableJVMCI) {
2074 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2075 AddProperty, UnwriteableProperty, InternalProperty);
2076 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2077 return false;
2078 }
2079 }
2080 #endif
2081
2082 #ifndef SUPPORT_RESERVED_STACK_AREA
2083 if (StackReservedPages != 0) {
2084 FLAG_SET_CMDLINE(StackReservedPages, 0);
2085 warning("Reserved Stack Area not supported on this platform");
2086 }
2087 #endif
2088
2089 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2090 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2091 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2092 }
2093 }
2094
2095 status = status && GCArguments::check_args_consistency();
2096
2097 return status;
2098 }
2099
2100 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2101 const char* option_type) {
2102 if (ignore) return false;
2103
2104 const char* spacer = " ";
2105 if (option_type == NULL) {
2106 option_type = ++spacer; // Set both to the empty string.
2107 }
2108
2109 jio_fprintf(defaultStream::error_stream(),
2110 "Unrecognized %s%soption: %s\n", option_type, spacer,
2111 option->optionString);
2112 return true;
2113 }
2114
2115 static const char* user_assertion_options[] = {
2116 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2117 };
2118
2119 static const char* system_assertion_options[] = {
2120 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2121 };
2122
2123 bool Arguments::parse_uintx(const char* value,
2124 uintx* uintx_arg,
2125 uintx min_size) {
2126
2127 // Check the sign first since atojulong() parses only unsigned values.
2128 bool value_is_positive = !(*value == '-');
2129
2130 if (value_is_positive) {
2131 julong n;
2132 bool good_return = atojulong(value, &n);
2133 if (good_return) {
2134 bool above_minimum = n >= min_size;
2135 bool value_is_too_large = n > max_uintx;
2136
2137 if (above_minimum && !value_is_too_large) {
2138 *uintx_arg = n;
2139 return true;
2140 }
2141 }
2142 }
2143 return false;
2144 }
2145
2146 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2147 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2148 char* property = AllocateHeap(prop_len, mtArguments);
2149 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2150 if (ret < 0 || ret >= (int)prop_len) {
2151 FreeHeap(property);
2152 return false;
2153 }
2154 bool added = add_property(property, UnwriteableProperty, internal);
2155 FreeHeap(property);
2156 return added;
2157 }
2158
2159 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2160 const unsigned int props_count_limit = 1000;
2161 const int max_digits = 3;
2162 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2163
2164 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2165 if (count < props_count_limit) {
2166 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2167 char* property = AllocateHeap(prop_len, mtArguments);
2168 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2169 if (ret < 0 || ret >= (int)prop_len) {
2170 FreeHeap(property);
2171 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2172 return false;
2173 }
2174 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2175 FreeHeap(property);
2176 return added;
2177 }
2178
2179 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2180 return false;
2181 }
2182
2183 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2184 julong* long_arg,
2185 julong min_size,
2186 julong max_size) {
2187 if (!atojulong(s, long_arg)) return arg_unreadable;
2188 return check_memory_size(*long_arg, min_size, max_size);
2189 }
2190
2191 // Parse JavaVMInitArgs structure
2192
2193 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2194 const JavaVMInitArgs *java_tool_options_args,
2195 const JavaVMInitArgs *java_options_args,
2196 const JavaVMInitArgs *cmd_line_args) {
2197 bool patch_mod_javabase = false;
2198
2199 // Save default settings for some mode flags
2200 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2201 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2202 Arguments::_ClipInlining = ClipInlining;
2203 Arguments::_BackgroundCompilation = BackgroundCompilation;
2204 if (TieredCompilation) {
2205 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2206 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2207 }
2208
2209 // CDS dumping always write the archive to the default value of SharedBaseAddress.
2210 Arguments::_SharedBaseAddress = SharedBaseAddress;
2211
2212 // Setup flags for mixed which is the default
2213 set_mode_flags(_mixed);
2214
2215 // Parse args structure generated from java.base vm options resource
2216 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2217 if (result != JNI_OK) {
2218 return result;
2219 }
2220
2221 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2222 // variable (if present).
2223 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2224 if (result != JNI_OK) {
2225 return result;
2226 }
2227
2228 // Parse args structure generated from the command line flags.
2229 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2230 if (result != JNI_OK) {
2231 return result;
2232 }
2233
2234 // Parse args structure generated from the _JAVA_OPTIONS environment
2235 // variable (if present) (mimics classic VM)
2236 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2237 if (result != JNI_OK) {
2238 return result;
2239 }
2240
2241 // We need to ensure processor and memory resources have been properly
2242 // configured - which may rely on arguments we just processed - before
2243 // doing the final argument processing. Any argument processing that
2244 // needs to know about processor and memory resources must occur after
2245 // this point.
2246
2247 os::init_container_support();
2248
2249 // Do final processing now that all arguments have been parsed
2250 result = finalize_vm_init_args(patch_mod_javabase);
2251 if (result != JNI_OK) {
2252 return result;
2253 }
2254
2255 return JNI_OK;
2256 }
2257
2258 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2259 // represents a valid JDWP agent. is_path==true denotes that we
2260 // are dealing with -agentpath (case where name is a path), otherwise with
2261 // -agentlib
2262 bool valid_jdwp_agent(char *name, bool is_path) {
2263 char *_name;
2264 const char *_jdwp = "jdwp";
2265 size_t _len_jdwp, _len_prefix;
2266
2267 if (is_path) {
2268 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2269 return false;
2270 }
2271
2272 _name++; // skip past last path separator
2273 _len_prefix = strlen(JNI_LIB_PREFIX);
2274
2275 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2276 return false;
2277 }
2278
2279 _name += _len_prefix;
2280 _len_jdwp = strlen(_jdwp);
2281
2282 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2283 _name += _len_jdwp;
2284 }
2285 else {
2286 return false;
2287 }
2288
2289 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2290 return false;
2291 }
2292
2293 return true;
2294 }
2295
2296 if (strcmp(name, _jdwp) == 0) {
2297 return true;
2298 }
2299
2300 return false;
2301 }
2302
2303 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2304 // --patch-module=<module>=<file>(<pathsep><file>)*
2305 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2306 // Find the equal sign between the module name and the path specification
2307 const char* module_equal = strchr(patch_mod_tail, '=');
2308 if (module_equal == NULL) {
2309 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2310 return JNI_ERR;
2311 } else {
2312 // Pick out the module name
2313 size_t module_len = module_equal - patch_mod_tail;
2314 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2315 if (module_name != NULL) {
2316 memcpy(module_name, patch_mod_tail, module_len);
2317 *(module_name + module_len) = '\0';
2318 // The path piece begins one past the module_equal sign
2319 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2320 FREE_C_HEAP_ARRAY(char, module_name);
2321 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2322 return JNI_ENOMEM;
2323 }
2324 } else {
2325 return JNI_ENOMEM;
2326 }
2327 }
2328 return JNI_OK;
2329 }
2330
2331 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2332 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2333 // The min and max sizes match the values in globals.hpp, but scaled
2334 // with K. The values have been chosen so that alignment with page
2335 // size doesn't change the max value, which makes the conversions
2336 // back and forth between Xss value and ThreadStackSize value easier.
2337 // The values have also been chosen to fit inside a 32-bit signed type.
2338 const julong min_ThreadStackSize = 0;
2339 const julong max_ThreadStackSize = 1 * M;
2340
2341 const julong min_size = min_ThreadStackSize * K;
2342 const julong max_size = max_ThreadStackSize * K;
2343
2344 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2345
2346 julong size = 0;
2347 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2348 if (errcode != arg_in_range) {
2349 bool silent = (option == NULL); // Allow testing to silence error messages
2350 if (!silent) {
2351 jio_fprintf(defaultStream::error_stream(),
2352 "Invalid thread stack size: %s\n", option->optionString);
2353 describe_range_error(errcode);
2354 }
2355 return JNI_EINVAL;
2356 }
2357
2358 // Internally track ThreadStackSize in units of 1024 bytes.
2359 const julong size_aligned = align_up(size, K);
2360 assert(size <= size_aligned,
2361 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2362 size, size_aligned);
2363
2364 const julong size_in_K = size_aligned / K;
2365 assert(size_in_K < (julong)max_intx,
2366 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2367 size_in_K);
2368
2369 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2370 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2371 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2372 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2373 max_expanded, size_in_K);
2374
2375 *out_ThreadStackSize = (intx)size_in_K;
2376
2377 return JNI_OK;
2378 }
2379
2380 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2381 // For match_option to return remaining or value part of option string
2382 const char* tail;
2383
2384 // iterate over arguments
2385 for (int index = 0; index < args->nOptions; index++) {
2386 bool is_absolute_path = false; // for -agentpath vs -agentlib
2387
2388 const JavaVMOption* option = args->options + index;
2389
2390 if (!match_option(option, "-Djava.class.path", &tail) &&
2391 !match_option(option, "-Dsun.java.command", &tail) &&
2392 !match_option(option, "-Dsun.java.launcher", &tail)) {
2393
2394 // add all jvm options to the jvm_args string. This string
2395 // is used later to set the java.vm.args PerfData string constant.
2396 // the -Djava.class.path and the -Dsun.java.command options are
2397 // omitted from jvm_args string as each have their own PerfData
2398 // string constant object.
2399 build_jvm_args(option->optionString);
2400 }
2401
2402 // -verbose:[class/module/gc/jni]
2403 if (match_option(option, "-verbose", &tail)) {
2404 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2405 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2406 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2407 } else if (!strcmp(tail, ":module")) {
2408 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2409 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2410 } else if (!strcmp(tail, ":gc")) {
2411 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2412 } else if (!strcmp(tail, ":jni")) {
2413 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2414 }
2415 // -da / -ea / -disableassertions / -enableassertions
2416 // These accept an optional class/package name separated by a colon, e.g.,
2417 // -da:java.lang.Thread.
2418 } else if (match_option(option, user_assertion_options, &tail, true)) {
2419 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2420 if (*tail == '\0') {
2421 JavaAssertions::setUserClassDefault(enable);
2422 } else {
2423 assert(*tail == ':', "bogus match by match_option()");
2424 JavaAssertions::addOption(tail + 1, enable);
2425 }
2426 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2427 } else if (match_option(option, system_assertion_options, &tail, false)) {
2428 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2429 JavaAssertions::setSystemClassDefault(enable);
2430 // -bootclasspath:
2431 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2432 jio_fprintf(defaultStream::output_stream(),
2433 "-Xbootclasspath is no longer a supported option.\n");
2434 return JNI_EINVAL;
2435 // -bootclasspath/a:
2436 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2437 Arguments::append_sysclasspath(tail);
2438 // -bootclasspath/p:
2439 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2440 jio_fprintf(defaultStream::output_stream(),
2441 "-Xbootclasspath/p is no longer a supported option.\n");
2442 return JNI_EINVAL;
2443 // -Xrun
2444 } else if (match_option(option, "-Xrun", &tail)) {
2445 if (tail != NULL) {
2446 const char* pos = strchr(tail, ':');
2447 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2448 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2449 jio_snprintf(name, len + 1, "%s", tail);
2450
2451 char *options = NULL;
2452 if(pos != NULL) {
2453 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2454 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2455 }
2456 #if !INCLUDE_JVMTI
2457 if (strcmp(name, "jdwp") == 0) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Debugging agents are not supported in this VM\n");
2460 return JNI_ERR;
2461 }
2462 #endif // !INCLUDE_JVMTI
2463 add_init_library(name, options);
2464 }
2465 } else if (match_option(option, "--add-reads=", &tail)) {
2466 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2467 return JNI_ENOMEM;
2468 }
2469 } else if (match_option(option, "--add-exports=", &tail)) {
2470 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2471 return JNI_ENOMEM;
2472 }
2473 } else if (match_option(option, "--add-opens=", &tail)) {
2474 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2475 return JNI_ENOMEM;
2476 }
2477 } else if (match_option(option, "--add-modules=", &tail)) {
2478 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2479 return JNI_ENOMEM;
2480 }
2481 } else if (match_option(option, "--limit-modules=", &tail)) {
2482 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2483 return JNI_ENOMEM;
2484 }
2485 } else if (match_option(option, "--module-path=", &tail)) {
2486 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2487 return JNI_ENOMEM;
2488 }
2489 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2490 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2491 return JNI_ENOMEM;
2492 }
2493 } else if (match_option(option, "--patch-module=", &tail)) {
2494 // --patch-module=<module>=<file>(<pathsep><file>)*
2495 int res = process_patch_mod_option(tail, patch_mod_javabase);
2496 if (res != JNI_OK) {
2497 return res;
2498 }
2499 } else if (match_option(option, "--illegal-access=", &tail)) {
2500 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2501 return JNI_ENOMEM;
2502 }
2503 // -agentlib and -agentpath
2504 } else if (match_option(option, "-agentlib:", &tail) ||
2505 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2506 if(tail != NULL) {
2507 const char* pos = strchr(tail, '=');
2508 char* name;
2509 if (pos == NULL) {
2510 name = os::strdup_check_oom(tail, mtArguments);
2511 } else {
2512 size_t len = pos - tail;
2513 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2514 memcpy(name, tail, len);
2515 name[len] = '\0';
2516 }
2517
2518 char *options = NULL;
2519 if(pos != NULL) {
2520 options = os::strdup_check_oom(pos + 1, mtArguments);
2521 }
2522 #if !INCLUDE_JVMTI
2523 if (valid_jdwp_agent(name, is_absolute_path)) {
2524 jio_fprintf(defaultStream::error_stream(),
2525 "Debugging agents are not supported in this VM\n");
2526 return JNI_ERR;
2527 }
2528 #endif // !INCLUDE_JVMTI
2529 add_init_agent(name, options, is_absolute_path);
2530 }
2531 // -javaagent
2532 } else if (match_option(option, "-javaagent:", &tail)) {
2533 #if !INCLUDE_JVMTI
2534 jio_fprintf(defaultStream::error_stream(),
2535 "Instrumentation agents are not supported in this VM\n");
2536 return JNI_ERR;
2537 #else
2538 if (tail != NULL) {
2539 size_t length = strlen(tail) + 1;
2540 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2541 jio_snprintf(options, length, "%s", tail);
2542 add_instrument_agent("instrument", options, false);
2543 // java agents need module java.instrument
2544 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2545 return JNI_ENOMEM;
2546 }
2547 }
2548 #endif // !INCLUDE_JVMTI
2549 // --enable_preview
2550 } else if (match_option(option, "--enable-preview")) {
2551 set_enable_preview();
2552 // -Xnoclassgc
2553 } else if (match_option(option, "-Xnoclassgc")) {
2554 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2555 return JNI_EINVAL;
2556 }
2557 // -Xbatch
2558 } else if (match_option(option, "-Xbatch")) {
2559 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2560 return JNI_EINVAL;
2561 }
2562 // -Xmn for compatibility with other JVM vendors
2563 } else if (match_option(option, "-Xmn", &tail)) {
2564 julong long_initial_young_size = 0;
2565 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2566 if (errcode != arg_in_range) {
2567 jio_fprintf(defaultStream::error_stream(),
2568 "Invalid initial young generation size: %s\n", option->optionString);
2569 describe_range_error(errcode);
2570 return JNI_EINVAL;
2571 }
2572 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2573 return JNI_EINVAL;
2574 }
2575 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2576 return JNI_EINVAL;
2577 }
2578 // -Xms
2579 } else if (match_option(option, "-Xms", &tail)) {
2580 julong size = 0;
2581 // an initial heap size of 0 means automatically determine
2582 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2583 if (errcode != arg_in_range) {
2584 jio_fprintf(defaultStream::error_stream(),
2585 "Invalid initial heap size: %s\n", option->optionString);
2586 describe_range_error(errcode);
2587 return JNI_EINVAL;
2588 }
2589 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2590 return JNI_EINVAL;
2591 }
2592 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2593 return JNI_EINVAL;
2594 }
2595 // -Xmx
2596 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2597 julong long_max_heap_size = 0;
2598 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2599 if (errcode != arg_in_range) {
2600 jio_fprintf(defaultStream::error_stream(),
2601 "Invalid maximum heap size: %s\n", option->optionString);
2602 describe_range_error(errcode);
2603 return JNI_EINVAL;
2604 }
2605 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2606 return JNI_EINVAL;
2607 }
2608 // Xmaxf
2609 } else if (match_option(option, "-Xmaxf", &tail)) {
2610 char* err;
2611 int maxf = (int)(strtod(tail, &err) * 100);
2612 if (*err != '\0' || *tail == '\0') {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Bad max heap free percentage size: %s\n",
2615 option->optionString);
2616 return JNI_EINVAL;
2617 } else {
2618 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2619 return JNI_EINVAL;
2620 }
2621 }
2622 // Xminf
2623 } else if (match_option(option, "-Xminf", &tail)) {
2624 char* err;
2625 int minf = (int)(strtod(tail, &err) * 100);
2626 if (*err != '\0' || *tail == '\0') {
2627 jio_fprintf(defaultStream::error_stream(),
2628 "Bad min heap free percentage size: %s\n",
2629 option->optionString);
2630 return JNI_EINVAL;
2631 } else {
2632 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2633 return JNI_EINVAL;
2634 }
2635 }
2636 // -Xss
2637 } else if (match_option(option, "-Xss", &tail)) {
2638 intx value = 0;
2639 jint err = parse_xss(option, tail, &value);
2640 if (err != JNI_OK) {
2641 return err;
2642 }
2643 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2647 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2648 julong long_ReservedCodeCacheSize = 0;
2649
2650 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2651 if (errcode != arg_in_range) {
2652 jio_fprintf(defaultStream::error_stream(),
2653 "Invalid maximum code cache size: %s.\n", option->optionString);
2654 return JNI_EINVAL;
2655 }
2656 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2657 return JNI_EINVAL;
2658 }
2659 // -green
2660 } else if (match_option(option, "-green")) {
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Green threads support not available\n");
2663 return JNI_EINVAL;
2664 // -native
2665 } else if (match_option(option, "-native")) {
2666 // HotSpot always uses native threads, ignore silently for compatibility
2667 // -Xrs
2668 } else if (match_option(option, "-Xrs")) {
2669 // Classic/EVM option, new functionality
2670 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2671 return JNI_EINVAL;
2672 }
2673 // -Xprof
2674 } else if (match_option(option, "-Xprof")) {
2675 char version[256];
2676 // Obsolete in JDK 10
2677 JDK_Version::jdk(10).to_string(version, sizeof(version));
2678 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2679 // -Xinternalversion
2680 } else if (match_option(option, "-Xinternalversion")) {
2681 jio_fprintf(defaultStream::output_stream(), "%s\n",
2682 VM_Version::internal_vm_info_string());
2683 vm_exit(0);
2684 #ifndef PRODUCT
2685 // -Xprintflags
2686 } else if (match_option(option, "-Xprintflags")) {
2687 JVMFlag::printFlags(tty, false);
2688 vm_exit(0);
2689 #endif
2690 // -D
2691 } else if (match_option(option, "-D", &tail)) {
2692 const char* value;
2693 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2694 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2695 // abort if -Djava.endorsed.dirs is set
2696 jio_fprintf(defaultStream::output_stream(),
2697 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2698 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2699 return JNI_EINVAL;
2700 }
2701 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2702 *value != '\0' && strcmp(value, "\"\"") != 0) {
2703 // abort if -Djava.ext.dirs is set
2704 jio_fprintf(defaultStream::output_stream(),
2705 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2706 return JNI_EINVAL;
2707 }
2708 // Check for module related properties. They must be set using the modules
2709 // options. For example: use "--add-modules=java.sql", not
2710 // "-Djdk.module.addmods=java.sql"
2711 if (is_internal_module_property(option->optionString + 2)) {
2712 needs_module_property_warning = true;
2713 continue;
2714 }
2715 if (!add_property(tail)) {
2716 return JNI_ENOMEM;
2717 }
2718 // Out of the box management support
2719 if (match_option(option, "-Dcom.sun.management", &tail)) {
2720 #if INCLUDE_MANAGEMENT
2721 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 // management agent in module jdk.management.agent
2725 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2726 return JNI_ENOMEM;
2727 }
2728 #else
2729 jio_fprintf(defaultStream::output_stream(),
2730 "-Dcom.sun.management is not supported in this VM.\n");
2731 return JNI_ERR;
2732 #endif
2733 }
2734 // -Xint
2735 } else if (match_option(option, "-Xint")) {
2736 set_mode_flags(_int);
2737 // -Xmixed
2738 } else if (match_option(option, "-Xmixed")) {
2739 set_mode_flags(_mixed);
2740 // -Xcomp
2741 } else if (match_option(option, "-Xcomp")) {
2742 // for testing the compiler; turn off all flags that inhibit compilation
2743 set_mode_flags(_comp);
2744 // -Xshare:dump
2745 } else if (match_option(option, "-Xshare:dump")) {
2746 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 // -Xshare:on
2750 } else if (match_option(option, "-Xshare:on")) {
2751 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2758 } else if (match_option(option, "-Xshare:auto")) {
2759 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 // -Xshare:off
2766 } else if (match_option(option, "-Xshare:off")) {
2767 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 // -Xverify
2774 } else if (match_option(option, "-Xverify", &tail)) {
2775 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2776 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2780 return JNI_EINVAL;
2781 }
2782 } else if (strcmp(tail, ":remote") == 0) {
2783 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2787 return JNI_EINVAL;
2788 }
2789 } else if (strcmp(tail, ":none") == 0) {
2790 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2794 return JNI_EINVAL;
2795 }
2796 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2797 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2798 return JNI_EINVAL;
2799 }
2800 // -Xdebug
2801 } else if (match_option(option, "-Xdebug")) {
2802 // note this flag has been used, then ignore
2803 set_xdebug_mode(true);
2804 // -Xnoagent
2805 } else if (match_option(option, "-Xnoagent")) {
2806 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2807 } else if (match_option(option, "-Xloggc:", &tail)) {
2808 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2809 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2810 _gc_log_filename = os::strdup_check_oom(tail);
2811 } else if (match_option(option, "-Xlog", &tail)) {
2812 bool ret = false;
2813 if (strcmp(tail, ":help") == 0) {
2814 fileStream stream(defaultStream::output_stream());
2815 LogConfiguration::print_command_line_help(&stream);
2816 vm_exit(0);
2817 } else if (strcmp(tail, ":disable") == 0) {
2818 LogConfiguration::disable_logging();
2819 ret = true;
2820 } else if (*tail == '\0') {
2821 ret = LogConfiguration::parse_command_line_arguments();
2822 assert(ret, "-Xlog without arguments should never fail to parse");
2823 } else if (*tail == ':') {
2824 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2825 }
2826 if (ret == false) {
2827 jio_fprintf(defaultStream::error_stream(),
2828 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2829 tail);
2830 return JNI_EINVAL;
2831 }
2832 // JNI hooks
2833 } else if (match_option(option, "-Xcheck", &tail)) {
2834 if (!strcmp(tail, ":jni")) {
2835 #if !INCLUDE_JNI_CHECK
2836 warning("JNI CHECKING is not supported in this VM");
2837 #else
2838 CheckJNICalls = true;
2839 #endif // INCLUDE_JNI_CHECK
2840 } else if (is_bad_option(option, args->ignoreUnrecognized,
2841 "check")) {
2842 return JNI_EINVAL;
2843 }
2844 } else if (match_option(option, "vfprintf")) {
2845 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2846 } else if (match_option(option, "exit")) {
2847 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2848 } else if (match_option(option, "abort")) {
2849 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2850 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2851 // and the last option wins.
2852 } else if (match_option(option, "-XX:+NeverTenure")) {
2853 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2857 return JNI_EINVAL;
2858 }
2859 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2863 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2870 return JNI_EINVAL;
2871 }
2872 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2873 uintx max_tenuring_thresh = 0;
2874 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2877 return JNI_EINVAL;
2878 }
2879
2880 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883
2884 if (MaxTenuringThreshold == 0) {
2885 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 } else {
2892 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898 }
2899 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2900 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2907 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2914 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2921 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2922 return JNI_EINVAL;
2923 }
2924 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2928 #if defined(DTRACE_ENABLED)
2929 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2933 return JNI_EINVAL;
2934 }
2935 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2936 return JNI_EINVAL;
2937 }
2938 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2939 return JNI_EINVAL;
2940 }
2941 #else // defined(DTRACE_ENABLED)
2942 jio_fprintf(defaultStream::error_stream(),
2943 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2944 return JNI_EINVAL;
2945 #endif // defined(DTRACE_ENABLED)
2946 #ifdef ASSERT
2947 } else if (match_option(option, "-XX:+FullGCALot")) {
2948 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 // disable scavenge before parallel mark-compact
2952 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2953 return JNI_EINVAL;
2954 }
2955 #endif
2956 #if !INCLUDE_MANAGEMENT
2957 } else if (match_option(option, "-XX:+ManagementServer")) {
2958 jio_fprintf(defaultStream::error_stream(),
2959 "ManagementServer is not supported in this VM.\n");
2960 return JNI_ERR;
2961 #endif // INCLUDE_MANAGEMENT
2962 #if INCLUDE_JVMCI
2963 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2964 if (EnableJVMCIProduct) {
2965 jio_fprintf(defaultStream::error_stream(),
2966 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2967 return JNI_EINVAL;
2968 }
2969 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2970 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2971 // Allow this flag if it has been unlocked.
2972 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2973 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2974 jio_fprintf(defaultStream::error_stream(),
2975 "Unable to enable JVMCI in product mode");
2976 return JNI_ERR;
2977 }
2978 }
2979 // The flag was locked so process normally to report that error
2980 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2981 return JNI_EINVAL;
2982 }
2983 #endif // INCLUDE_JVMCI
2984 #if INCLUDE_JFR
2985 } else if (match_jfr_option(&option)) {
2986 return JNI_EINVAL;
2987 #endif
2988 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2989 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2990 // already been handled
2991 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2992 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2993 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2994 return JNI_EINVAL;
2995 }
2996 }
2997 // Unknown option
2998 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2999 return JNI_ERR;
3000 }
3001 }
3002
3003 // PrintSharedArchiveAndExit will turn on
3004 // -Xshare:on
3005 // -Xlog:class+path=info
3006 if (PrintSharedArchiveAndExit) {
3007 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3011 return JNI_EINVAL;
3012 }
3013 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3014 }
3015
3016 fix_appclasspath();
3017
3018 return JNI_OK;
3019 }
3020
3021 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3022 // For java.base check for duplicate --patch-module options being specified on the command line.
3023 // This check is only required for java.base, all other duplicate module specifications
3024 // will be checked during module system initialization. The module system initialization
3025 // will throw an ExceptionInInitializerError if this situation occurs.
3026 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3027 if (*patch_mod_javabase) {
3028 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3029 } else {
3030 *patch_mod_javabase = true;
3031 }
3032 }
3033
3034 // Create GrowableArray lazily, only if --patch-module has been specified
3035 if (_patch_mod_prefix == NULL) {
3036 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3037 }
3038
3039 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3040 }
3041
3042 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3043 //
3044 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3045 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3046 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3047 // path is treated as the current directory.
3048 //
3049 // This causes problems with CDS, which requires that all directories specified in the classpath
3050 // must be empty. In most cases, applications do NOT want to load classes from the current
3051 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3052 // scripts compatible with CDS.
3053 void Arguments::fix_appclasspath() {
3054 if (IgnoreEmptyClassPaths) {
3055 const char separator = *os::path_separator();
3056 const char* src = _java_class_path->value();
3057
3058 // skip over all the leading empty paths
3059 while (*src == separator) {
3060 src ++;
3061 }
3062
3063 char* copy = os::strdup_check_oom(src, mtArguments);
3064
3065 // trim all trailing empty paths
3066 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3067 *tail = '\0';
3068 }
3069
3070 char from[3] = {separator, separator, '\0'};
3071 char to [2] = {separator, '\0'};
3072 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3073 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3074 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3075 }
3076
3077 _java_class_path->set_writeable_value(copy);
3078 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3079 }
3080 }
3081
3082 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3083 // check if the default lib/endorsed directory exists; if so, error
3084 char path[JVM_MAXPATHLEN];
3085 const char* fileSep = os::file_separator();
3086 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3087
3088 DIR* dir = os::opendir(path);
3089 if (dir != NULL) {
3090 jio_fprintf(defaultStream::output_stream(),
3091 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3092 "in modular form will be supported via the concept of upgradeable modules.\n");
3093 os::closedir(dir);
3094 return JNI_ERR;
3095 }
3096
3097 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3098 dir = os::opendir(path);
3099 if (dir != NULL) {
3100 jio_fprintf(defaultStream::output_stream(),
3101 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3102 "Use -classpath instead.\n.");
3103 os::closedir(dir);
3104 return JNI_ERR;
3105 }
3106
3107 // This must be done after all arguments have been processed
3108 // and the container support has been initialized since AggressiveHeap
3109 // relies on the amount of total memory available.
3110 if (AggressiveHeap) {
3111 jint result = set_aggressive_heap_flags();
3112 if (result != JNI_OK) {
3113 return result;
3114 }
3115 }
3116
3117 // This must be done after all arguments have been processed.
3118 // java_compiler() true means set to "NONE" or empty.
3119 if (java_compiler() && !xdebug_mode()) {
3120 // For backwards compatibility, we switch to interpreted mode if
3121 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3122 // not specified.
3123 set_mode_flags(_int);
3124 }
3125
3126 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3127 // but like -Xint, leave compilation thresholds unaffected.
3128 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3129 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3130 set_mode_flags(_int);
3131 }
3132
3133 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3134 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3135 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3136 }
3137
3138 #if !COMPILER2_OR_JVMCI
3139 // Don't degrade server performance for footprint
3140 if (FLAG_IS_DEFAULT(UseLargePages) &&
3141 MaxHeapSize < LargePageHeapSizeThreshold) {
3142 // No need for large granularity pages w/small heaps.
3143 // Note that large pages are enabled/disabled for both the
3144 // Java heap and the code cache.
3145 FLAG_SET_DEFAULT(UseLargePages, false);
3146 }
3147
3148 UNSUPPORTED_OPTION(ProfileInterpreter);
3149 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3150 #endif
3151
3152
3153 #ifdef TIERED
3154 // Parse the CompilationMode flag
3155 if (!CompilationModeFlag::initialize()) {
3156 return JNI_ERR;
3157 }
3158 #else
3159 // Tiered compilation is undefined.
3160 UNSUPPORTED_OPTION(TieredCompilation);
3161 #endif
3162
3163 if (!check_vm_args_consistency()) {
3164 return JNI_ERR;
3165 }
3166
3167 #if INCLUDE_CDS
3168 if (DumpSharedSpaces) {
3169 // Disable biased locking now as it interferes with the clean up of
3170 // the archived Klasses and Java string objects (at dump time only).
3171 UseBiasedLocking = false;
3172
3173 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3174 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3175 // compiler just to be safe.
3176 //
3177 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3178 // instead of modifying them in place. The copy is inaccessible to the compiler.
3179 // TODO: revisit the following for the static archive case.
3180 set_mode_flags(_int);
3181 }
3182 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3183 // Always verify non-system classes during CDS dump
3184 if (!BytecodeVerificationRemote) {
3185 BytecodeVerificationRemote = true;
3186 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3187 }
3188 }
3189 if (ArchiveClassesAtExit == NULL) {
3190 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3191 }
3192 if (UseSharedSpaces && patch_mod_javabase) {
3193 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3194 }
3195 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3196 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3197 }
3198 #endif
3199
3200 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3201 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3202 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3203
3204 return JNI_OK;
3205 }
3206
3207 // Helper class for controlling the lifetime of JavaVMInitArgs
3208 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3209 // deleted on the destruction of the ScopedVMInitArgs object.
3210 class ScopedVMInitArgs : public StackObj {
3211 private:
3212 JavaVMInitArgs _args;
3213 char* _container_name;
3214 bool _is_set;
3215 char* _vm_options_file_arg;
3216
3217 public:
3218 ScopedVMInitArgs(const char *container_name) {
3219 _args.version = JNI_VERSION_1_2;
3220 _args.nOptions = 0;
3221 _args.options = NULL;
3222 _args.ignoreUnrecognized = false;
3223 _container_name = (char *)container_name;
3224 _is_set = false;
3225 _vm_options_file_arg = NULL;
3226 }
3227
3228 // Populates the JavaVMInitArgs object represented by this
3229 // ScopedVMInitArgs object with the arguments in options. The
3230 // allocated memory is deleted by the destructor. If this method
3231 // returns anything other than JNI_OK, then this object is in a
3232 // partially constructed state, and should be abandoned.
3233 jint set_args(GrowableArray<JavaVMOption>* options) {
3234 _is_set = true;
3235 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3236 JavaVMOption, options->length(), mtArguments);
3237 if (options_arr == NULL) {
3238 return JNI_ENOMEM;
3239 }
3240 _args.options = options_arr;
3241
3242 for (int i = 0; i < options->length(); i++) {
3243 options_arr[i] = options->at(i);
3244 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3245 if (options_arr[i].optionString == NULL) {
3246 // Rely on the destructor to do cleanup.
3247 _args.nOptions = i;
3248 return JNI_ENOMEM;
3249 }
3250 }
3251
3252 _args.nOptions = options->length();
3253 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3254 return JNI_OK;
3255 }
3256
3257 JavaVMInitArgs* get() { return &_args; }
3258 char* container_name() { return _container_name; }
3259 bool is_set() { return _is_set; }
3260 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3261 char* vm_options_file_arg() { return _vm_options_file_arg; }
3262
3263 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3264 if (_vm_options_file_arg != NULL) {
3265 os::free(_vm_options_file_arg);
3266 }
3267 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3268 }
3269
3270 ~ScopedVMInitArgs() {
3271 if (_vm_options_file_arg != NULL) {
3272 os::free(_vm_options_file_arg);
3273 }
3274 if (_args.options == NULL) return;
3275 for (int i = 0; i < _args.nOptions; i++) {
3276 os::free(_args.options[i].optionString);
3277 }
3278 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3279 }
3280
3281 // Insert options into this option list, to replace option at
3282 // vm_options_file_pos (-XX:VMOptionsFile)
3283 jint insert(const JavaVMInitArgs* args,
3284 const JavaVMInitArgs* args_to_insert,
3285 const int vm_options_file_pos) {
3286 assert(_args.options == NULL, "shouldn't be set yet");
3287 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3288 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3289
3290 int length = args->nOptions + args_to_insert->nOptions - 1;
3291 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3292 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3293 for (int i = 0; i < args->nOptions; i++) {
3294 if (i == vm_options_file_pos) {
3295 // insert the new options starting at the same place as the
3296 // -XX:VMOptionsFile option
3297 for (int j = 0; j < args_to_insert->nOptions; j++) {
3298 options->push(args_to_insert->options[j]);
3299 }
3300 } else {
3301 options->push(args->options[i]);
3302 }
3303 }
3304 // make into options array
3305 jint result = set_args(options);
3306 delete options;
3307 return result;
3308 }
3309 };
3310
3311 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3312 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3313 }
3314
3315 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3316 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3317 }
3318
3319 jint Arguments::parse_options_environment_variable(const char* name,
3320 ScopedVMInitArgs* vm_args) {
3321 char *buffer = ::getenv(name);
3322
3323 // Don't check this environment variable if user has special privileges
3324 // (e.g. unix su command).
3325 if (buffer == NULL || os::have_special_privileges()) {
3326 return JNI_OK;
3327 }
3328
3329 if ((buffer = os::strdup(buffer)) == NULL) {
3330 return JNI_ENOMEM;
3331 }
3332
3333 jio_fprintf(defaultStream::error_stream(),
3334 "Picked up %s: %s\n", name, buffer);
3335
3336 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3337
3338 os::free(buffer);
3339 return retcode;
3340 }
3341
3342 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3343 // read file into buffer
3344 int fd = ::open(file_name, O_RDONLY);
3345 if (fd < 0) {
3346 jio_fprintf(defaultStream::error_stream(),
3347 "Could not open options file '%s'\n",
3348 file_name);
3349 return JNI_ERR;
3350 }
3351
3352 struct stat stbuf;
3353 int retcode = os::stat(file_name, &stbuf);
3354 if (retcode != 0) {
3355 jio_fprintf(defaultStream::error_stream(),
3356 "Could not stat options file '%s'\n",
3357 file_name);
3358 os::close(fd);
3359 return JNI_ERR;
3360 }
3361
3362 if (stbuf.st_size == 0) {
3363 // tell caller there is no option data and that is ok
3364 os::close(fd);
3365 return JNI_OK;
3366 }
3367
3368 // '+ 1' for NULL termination even with max bytes
3369 size_t bytes_alloc = stbuf.st_size + 1;
3370
3371 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3372 if (NULL == buf) {
3373 jio_fprintf(defaultStream::error_stream(),
3374 "Could not allocate read buffer for options file parse\n");
3375 os::close(fd);
3376 return JNI_ENOMEM;
3377 }
3378
3379 memset(buf, 0, bytes_alloc);
3380
3381 // Fill buffer
3382 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3383 os::close(fd);
3384 if (bytes_read < 0) {
3385 FREE_C_HEAP_ARRAY(char, buf);
3386 jio_fprintf(defaultStream::error_stream(),
3387 "Could not read options file '%s'\n", file_name);
3388 return JNI_ERR;
3389 }
3390
3391 if (bytes_read == 0) {
3392 // tell caller there is no option data and that is ok
3393 FREE_C_HEAP_ARRAY(char, buf);
3394 return JNI_OK;
3395 }
3396
3397 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3398
3399 FREE_C_HEAP_ARRAY(char, buf);
3400 return retcode;
3401 }
3402
3403 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3404 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3405
3406 // some pointers to help with parsing
3407 char *buffer_end = buffer + buf_len;
3408 char *opt_hd = buffer;
3409 char *wrt = buffer;
3410 char *rd = buffer;
3411
3412 // parse all options
3413 while (rd < buffer_end) {
3414 // skip leading white space from the input string
3415 while (rd < buffer_end && isspace(*rd)) {
3416 rd++;
3417 }
3418
3419 if (rd >= buffer_end) {
3420 break;
3421 }
3422
3423 // Remember this is where we found the head of the token.
3424 opt_hd = wrt;
3425
3426 // Tokens are strings of non white space characters separated
3427 // by one or more white spaces.
3428 while (rd < buffer_end && !isspace(*rd)) {
3429 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3430 int quote = *rd; // matching quote to look for
3431 rd++; // don't copy open quote
3432 while (rd < buffer_end && *rd != quote) {
3433 // include everything (even spaces)
3434 // up until the close quote
3435 *wrt++ = *rd++; // copy to option string
3436 }
3437
3438 if (rd < buffer_end) {
3439 rd++; // don't copy close quote
3440 } else {
3441 // did not see closing quote
3442 jio_fprintf(defaultStream::error_stream(),
3443 "Unmatched quote in %s\n", name);
3444 delete options;
3445 return JNI_ERR;
3446 }
3447 } else {
3448 *wrt++ = *rd++; // copy to option string
3449 }
3450 }
3451
3452 // steal a white space character and set it to NULL
3453 *wrt++ = '\0';
3454 // We now have a complete token
3455
3456 JavaVMOption option;
3457 option.optionString = opt_hd;
3458 option.extraInfo = NULL;
3459
3460 options->append(option); // Fill in option
3461
3462 rd++; // Advance to next character
3463 }
3464
3465 // Fill out JavaVMInitArgs structure.
3466 jint status = vm_args->set_args(options);
3467
3468 delete options;
3469 return status;
3470 }
3471
3472 void Arguments::set_shared_spaces_flags() {
3473 if (DumpSharedSpaces) {
3474 if (RequireSharedSpaces) {
3475 warning("Cannot dump shared archive while using shared archive");
3476 }
3477 UseSharedSpaces = false;
3478 #ifdef _LP64
3479 if (!UseCompressedOops || !UseCompressedClassPointers) {
3480 vm_exit_during_initialization(
3481 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3482 }
3483 } else {
3484 if (!UseCompressedOops || !UseCompressedClassPointers) {
3485 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3486 }
3487 #endif
3488 }
3489 }
3490
3491 #if INCLUDE_CDS
3492 // Sharing support
3493 // Construct the path to the archive
3494 char* Arguments::get_default_shared_archive_path() {
3495 char *default_archive_path;
3496 char jvm_path[JVM_MAXPATHLEN];
3497 os::jvm_path(jvm_path, sizeof(jvm_path));
3498 char *end = strrchr(jvm_path, *os::file_separator());
3499 if (end != NULL) *end = '\0';
3500 size_t jvm_path_len = strlen(jvm_path);
3501 size_t file_sep_len = strlen(os::file_separator());
3502 const size_t len = jvm_path_len + file_sep_len + 20;
3503 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3504 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3505 jvm_path, os::file_separator());
3506 return default_archive_path;
3507 }
3508
3509 int Arguments::num_archives(const char* archive_path) {
3510 if (archive_path == NULL) {
3511 return 0;
3512 }
3513 int npaths = 1;
3514 char* p = (char*)archive_path;
3515 while (*p != '\0') {
3516 if (*p == os::path_separator()[0]) {
3517 npaths++;
3518 }
3519 p++;
3520 }
3521 return npaths;
3522 }
3523
3524 void Arguments::extract_shared_archive_paths(const char* archive_path,
3525 char** base_archive_path,
3526 char** top_archive_path) {
3527 char* begin_ptr = (char*)archive_path;
3528 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3529 if (end_ptr == NULL || end_ptr == begin_ptr) {
3530 vm_exit_during_initialization("Base archive was not specified", archive_path);
3531 }
3532 size_t len = end_ptr - begin_ptr;
3533 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3534 strncpy(cur_path, begin_ptr, len);
3535 cur_path[len] = '\0';
3536 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3537 *base_archive_path = cur_path;
3538
3539 begin_ptr = ++end_ptr;
3540 if (*begin_ptr == '\0') {
3541 vm_exit_during_initialization("Top archive was not specified", archive_path);
3542 }
3543 end_ptr = strchr(begin_ptr, '\0');
3544 assert(end_ptr != NULL, "sanity");
3545 len = end_ptr - begin_ptr;
3546 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3547 strncpy(cur_path, begin_ptr, len + 1);
3548 //cur_path[len] = '\0';
3549 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3550 *top_archive_path = cur_path;
3551 }
3552
3553 bool Arguments::init_shared_archive_paths() {
3554 if (ArchiveClassesAtExit != NULL) {
3555 if (DumpSharedSpaces) {
3556 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3557 }
3558 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3559 return false;
3560 }
3561 check_unsupported_dumping_properties();
3562 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3563 }
3564 if (SharedArchiveFile == NULL) {
3565 SharedArchivePath = get_default_shared_archive_path();
3566 } else {
3567 int archives = num_archives(SharedArchiveFile);
3568 if (is_dumping_archive()) {
3569 if (archives > 1) {
3570 vm_exit_during_initialization(
3571 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3572 }
3573 if (DynamicDumpSharedSpaces) {
3574 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3575 vm_exit_during_initialization(
3576 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3577 SharedArchiveFile);
3578 }
3579 }
3580 }
3581 if (!is_dumping_archive()){
3582 if (archives > 2) {
3583 vm_exit_during_initialization(
3584 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3585 }
3586 if (archives == 1) {
3587 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3588 int name_size;
3589 bool success =
3590 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3591 if (!success) {
3592 SharedArchivePath = temp_archive_path;
3593 } else {
3594 SharedDynamicArchivePath = temp_archive_path;
3595 }
3596 } else {
3597 extract_shared_archive_paths((const char*)SharedArchiveFile,
3598 &SharedArchivePath, &SharedDynamicArchivePath);
3599 }
3600 } else { // CDS dumping
3601 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3602 }
3603 }
3604 return (SharedArchivePath != NULL);
3605 }
3606 #endif // INCLUDE_CDS
3607
3608 #ifndef PRODUCT
3609 // Determine whether LogVMOutput should be implicitly turned on.
3610 static bool use_vm_log() {
3611 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3612 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3613 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3614 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3615 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3616 return true;
3617 }
3618
3619 #ifdef COMPILER1
3620 if (PrintC1Statistics) {
3621 return true;
3622 }
3623 #endif // COMPILER1
3624
3625 #ifdef COMPILER2
3626 if (PrintOptoAssembly || PrintOptoStatistics) {
3627 return true;
3628 }
3629 #endif // COMPILER2
3630
3631 return false;
3632 }
3633
3634 #endif // PRODUCT
3635
3636 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3637 for (int index = 0; index < args->nOptions; index++) {
3638 const JavaVMOption* option = args->options + index;
3639 const char* tail;
3640 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3641 return true;
3642 }
3643 }
3644 return false;
3645 }
3646
3647 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3648 const char* vm_options_file,
3649 const int vm_options_file_pos,
3650 ScopedVMInitArgs* vm_options_file_args,
3651 ScopedVMInitArgs* args_out) {
3652 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3653 if (code != JNI_OK) {
3654 return code;
3655 }
3656
3657 if (vm_options_file_args->get()->nOptions < 1) {
3658 return JNI_OK;
3659 }
3660
3661 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3662 jio_fprintf(defaultStream::error_stream(),
3663 "A VM options file may not refer to a VM options file. "
3664 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3665 "options file '%s' in options container '%s' is an error.\n",
3666 vm_options_file_args->vm_options_file_arg(),
3667 vm_options_file_args->container_name());
3668 return JNI_EINVAL;
3669 }
3670
3671 return args_out->insert(args, vm_options_file_args->get(),
3672 vm_options_file_pos);
3673 }
3674
3675 // Expand -XX:VMOptionsFile found in args_in as needed.
3676 // mod_args and args_out parameters may return values as needed.
3677 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3678 ScopedVMInitArgs* mod_args,
3679 JavaVMInitArgs** args_out) {
3680 jint code = match_special_option_and_act(args_in, mod_args);
3681 if (code != JNI_OK) {
3682 return code;
3683 }
3684
3685 if (mod_args->is_set()) {
3686 // args_in contains -XX:VMOptionsFile and mod_args contains the
3687 // original options from args_in along with the options expanded
3688 // from the VMOptionsFile. Return a short-hand to the caller.
3689 *args_out = mod_args->get();
3690 } else {
3691 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3692 }
3693 return JNI_OK;
3694 }
3695
3696 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3697 ScopedVMInitArgs* args_out) {
3698 // Remaining part of option string
3699 const char* tail;
3700 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3701
3702 for (int index = 0; index < args->nOptions; index++) {
3703 const JavaVMOption* option = args->options + index;
3704 if (match_option(option, "-XX:Flags=", &tail)) {
3705 Arguments::set_jvm_flags_file(tail);
3706 continue;
3707 }
3708 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3709 if (vm_options_file_args.found_vm_options_file_arg()) {
3710 jio_fprintf(defaultStream::error_stream(),
3711 "The option '%s' is already specified in the options "
3712 "container '%s' so the specification of '%s' in the "
3713 "same options container is an error.\n",
3714 vm_options_file_args.vm_options_file_arg(),
3715 vm_options_file_args.container_name(),
3716 option->optionString);
3717 return JNI_EINVAL;
3718 }
3719 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3720 // If there's a VMOptionsFile, parse that
3721 jint code = insert_vm_options_file(args, tail, index,
3722 &vm_options_file_args, args_out);
3723 if (code != JNI_OK) {
3724 return code;
3725 }
3726 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3727 if (args_out->is_set()) {
3728 // The VMOptions file inserted some options so switch 'args'
3729 // to the new set of options, and continue processing which
3730 // preserves "last option wins" semantics.
3731 args = args_out->get();
3732 // The first option from the VMOptionsFile replaces the
3733 // current option. So we back track to process the
3734 // replacement option.
3735 index--;
3736 }
3737 continue;
3738 }
3739 if (match_option(option, "-XX:+PrintVMOptions")) {
3740 PrintVMOptions = true;
3741 continue;
3742 }
3743 if (match_option(option, "-XX:-PrintVMOptions")) {
3744 PrintVMOptions = false;
3745 continue;
3746 }
3747 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3748 IgnoreUnrecognizedVMOptions = true;
3749 continue;
3750 }
3751 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3752 IgnoreUnrecognizedVMOptions = false;
3753 continue;
3754 }
3755 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3756 JVMFlag::printFlags(tty, false);
3757 vm_exit(0);
3758 }
3759 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3760 #if INCLUDE_NMT
3761 // The launcher did not setup nmt environment variable properly.
3762 if (!MemTracker::check_launcher_nmt_support(tail)) {
3763 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3764 }
3765
3766 // Verify if nmt option is valid.
3767 if (MemTracker::verify_nmt_option()) {
3768 // Late initialization, still in single-threaded mode.
3769 if (MemTracker::tracking_level() >= NMT_summary) {
3770 MemTracker::init();
3771 }
3772 } else {
3773 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3774 }
3775 continue;
3776 #else
3777 jio_fprintf(defaultStream::error_stream(),
3778 "Native Memory Tracking is not supported in this VM\n");
3779 return JNI_ERR;
3780 #endif
3781 }
3782
3783 #ifndef PRODUCT
3784 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3785 JVMFlag::printFlags(tty, true);
3786 vm_exit(0);
3787 }
3788 #endif
3789 }
3790 return JNI_OK;
3791 }
3792
3793 static void print_options(const JavaVMInitArgs *args) {
3794 const char* tail;
3795 for (int index = 0; index < args->nOptions; index++) {
3796 const JavaVMOption *option = args->options + index;
3797 if (match_option(option, "-XX:", &tail)) {
3798 logOption(tail);
3799 }
3800 }
3801 }
3802
3803 bool Arguments::handle_deprecated_print_gc_flags() {
3804 if (PrintGC) {
3805 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3806 }
3807 if (PrintGCDetails) {
3808 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3809 }
3810
3811 if (_gc_log_filename != NULL) {
3812 // -Xloggc was used to specify a filename
3813 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3814
3815 LogTarget(Error, logging) target;
3816 LogStream errstream(target);
3817 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3818 } else if (PrintGC || PrintGCDetails) {
3819 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3820 }
3821 return true;
3822 }
3823
3824 // Parse entry point called from JNI_CreateJavaVM
3825
3826 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3827 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3828
3829 // Initialize ranges, constraints and writeables
3830 JVMFlagRangeList::init();
3831 JVMFlagConstraintList::init();
3832 JVMFlagWriteableList::init();
3833
3834 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3835 const char* hotspotrc = ".hotspotrc";
3836 bool settings_file_specified = false;
3837 bool needs_hotspotrc_warning = false;
3838 ScopedVMInitArgs initial_vm_options_args("");
3839 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3840 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3841
3842 // Pointers to current working set of containers
3843 JavaVMInitArgs* cur_cmd_args;
3844 JavaVMInitArgs* cur_vm_options_args;
3845 JavaVMInitArgs* cur_java_options_args;
3846 JavaVMInitArgs* cur_java_tool_options_args;
3847
3848 // Containers for modified/expanded options
3849 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3850 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3851 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3852 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3853
3854
3855 jint code =
3856 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3857 if (code != JNI_OK) {
3858 return code;
3859 }
3860
3861 code = parse_java_options_environment_variable(&initial_java_options_args);
3862 if (code != JNI_OK) {
3863 return code;
3864 }
3865
3866 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3867 char *vmoptions = ClassLoader::lookup_vm_options();
3868 if (vmoptions != NULL) {
3869 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3870 FREE_C_HEAP_ARRAY(char, vmoptions);
3871 if (code != JNI_OK) {
3872 return code;
3873 }
3874 }
3875
3876 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3877 &mod_java_tool_options_args,
3878 &cur_java_tool_options_args);
3879 if (code != JNI_OK) {
3880 return code;
3881 }
3882
3883 code = expand_vm_options_as_needed(initial_cmd_args,
3884 &mod_cmd_args,
3885 &cur_cmd_args);
3886 if (code != JNI_OK) {
3887 return code;
3888 }
3889
3890 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3891 &mod_java_options_args,
3892 &cur_java_options_args);
3893 if (code != JNI_OK) {
3894 return code;
3895 }
3896
3897 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3898 &mod_vm_options_args,
3899 &cur_vm_options_args);
3900 if (code != JNI_OK) {
3901 return code;
3902 }
3903
3904 const char* flags_file = Arguments::get_jvm_flags_file();
3905 settings_file_specified = (flags_file != NULL);
3906
3907 if (IgnoreUnrecognizedVMOptions) {
3908 cur_cmd_args->ignoreUnrecognized = true;
3909 cur_java_tool_options_args->ignoreUnrecognized = true;
3910 cur_java_options_args->ignoreUnrecognized = true;
3911 }
3912
3913 // Parse specified settings file
3914 if (settings_file_specified) {
3915 if (!process_settings_file(flags_file, true,
3916 cur_cmd_args->ignoreUnrecognized)) {
3917 return JNI_EINVAL;
3918 }
3919 } else {
3920 #ifdef ASSERT
3921 // Parse default .hotspotrc settings file
3922 if (!process_settings_file(".hotspotrc", false,
3923 cur_cmd_args->ignoreUnrecognized)) {
3924 return JNI_EINVAL;
3925 }
3926 #else
3927 struct stat buf;
3928 if (os::stat(hotspotrc, &buf) == 0) {
3929 needs_hotspotrc_warning = true;
3930 }
3931 #endif
3932 }
3933
3934 if (PrintVMOptions) {
3935 print_options(cur_java_tool_options_args);
3936 print_options(cur_cmd_args);
3937 print_options(cur_java_options_args);
3938 }
3939
3940 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3941 jint result = parse_vm_init_args(cur_vm_options_args,
3942 cur_java_tool_options_args,
3943 cur_java_options_args,
3944 cur_cmd_args);
3945
3946 if (result != JNI_OK) {
3947 return result;
3948 }
3949
3950 #if INCLUDE_CDS
3951 // Initialize shared archive paths which could include both base and dynamic archive paths
3952 if (!init_shared_archive_paths()) {
3953 return JNI_ENOMEM;
3954 }
3955 #endif
3956
3957 // Delay warning until here so that we've had a chance to process
3958 // the -XX:-PrintWarnings flag
3959 if (needs_hotspotrc_warning) {
3960 warning("%s file is present but has been ignored. "
3961 "Run with -XX:Flags=%s to load the file.",
3962 hotspotrc, hotspotrc);
3963 }
3964
3965 if (needs_module_property_warning) {
3966 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3967 " names that are reserved for internal use.");
3968 }
3969
3970 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3971 UNSUPPORTED_OPTION(UseLargePages);
3972 #endif
3973
3974 #if defined(AIX)
3975 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3976 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3977 #endif
3978
3979 #ifndef PRODUCT
3980 if (TraceBytecodesAt != 0) {
3981 TraceBytecodes = true;
3982 }
3983 if (CountCompiledCalls) {
3984 if (UseCounterDecay) {
3985 warning("UseCounterDecay disabled because CountCalls is set");
3986 UseCounterDecay = false;
3987 }
3988 }
3989 #endif // PRODUCT
3990
3991 if (ScavengeRootsInCode == 0) {
3992 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3993 warning("Forcing ScavengeRootsInCode non-zero");
3994 }
3995 ScavengeRootsInCode = 1;
3996 }
3997
3998 if (!handle_deprecated_print_gc_flags()) {
3999 return JNI_EINVAL;
4000 }
4001
4002 // Set object alignment values.
4003 set_object_alignment();
4004
4005 #if !INCLUDE_CDS
4006 if (DumpSharedSpaces || RequireSharedSpaces) {
4007 jio_fprintf(defaultStream::error_stream(),
4008 "Shared spaces are not supported in this VM\n");
4009 return JNI_ERR;
4010 }
4011 if (DumpLoadedClassList != NULL) {
4012 jio_fprintf(defaultStream::error_stream(),
4013 "DumpLoadedClassList is not supported in this VM\n");
4014 return JNI_ERR;
4015 }
4016 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4017 log_is_enabled(Info, cds)) {
4018 warning("Shared spaces are not supported in this VM");
4019 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4020 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4021 }
4022 no_shared_spaces("CDS Disabled");
4023 #endif // INCLUDE_CDS
4024
4025 #ifndef TIERED
4026 if (FLAG_IS_CMDLINE(CompilationMode)) {
4027 warning("CompilationMode has no effect in non-tiered VMs");
4028 }
4029 #endif
4030
4031 return JNI_OK;
4032 }
4033
4034 jint Arguments::apply_ergo() {
4035 // Set flags based on ergonomics.
4036 jint result = set_ergonomics_flags();
4037 if (result != JNI_OK) return result;
4038
4039 // Set heap size based on available physical memory
4040 set_heap_size();
4041
4042 GCConfig::arguments()->initialize();
4043
4044 set_shared_spaces_flags();
4045
4046 // Initialize Metaspace flags and alignments
4047 Metaspace::ergo_initialize();
4048
4049 // Set compiler flags after GC is selected and GC specific
4050 // flags (LoopStripMiningIter) are set.
4051 CompilerConfig::ergo_initialize();
4052
4053 // Set bytecode rewriting flags
4054 set_bytecode_flags();
4055
4056 // Set flags if aggressive optimization flags are enabled
4057 jint code = set_aggressive_opts_flags();
4058 if (code != JNI_OK) {
4059 return code;
4060 }
4061
4062 // Turn off biased locking for locking debug mode flags,
4063 // which are subtly different from each other but neither works with
4064 // biased locking
4065 if (UseHeavyMonitors
4066 #ifdef COMPILER1
4067 || !UseFastLocking
4068 #endif // COMPILER1
4069 #if INCLUDE_JVMCI
4070 || !JVMCIUseFastLocking
4071 #endif
4072 ) {
4073 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4074 // flag set to true on command line; warn the user that they
4075 // can't enable biased locking here
4076 warning("Biased Locking is not supported with locking debug flags"
4077 "; ignoring UseBiasedLocking flag." );
4078 }
4079 UseBiasedLocking = false;
4080 }
4081
4082 #ifdef CC_INTERP
4083 // Clear flags not supported on zero.
4084 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4085 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4086 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4087 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4088 #endif // CC_INTERP
4089
4090 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4091 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4092 DebugNonSafepoints = true;
4093 }
4094
4095 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4096 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4097 }
4098
4099 // Treat the odd case where local verification is enabled but remote
4100 // verification is not as if both were enabled.
4101 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4102 log_info(verification)("Turning on remote verification because local verification is on");
4103 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4104 }
4105
4106 #ifndef PRODUCT
4107 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4108 if (use_vm_log()) {
4109 LogVMOutput = true;
4110 }
4111 }
4112 #endif // PRODUCT
4113
4114 if (PrintCommandLineFlags) {
4115 JVMFlag::printSetFlags(tty);
4116 }
4117
4118 // Apply CPU specific policy for the BiasedLocking
4119 if (UseBiasedLocking) {
4120 if (!VM_Version::use_biased_locking() &&
4121 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4122 UseBiasedLocking = false;
4123 }
4124 }
4125 #ifdef COMPILER2
4126 if (!UseBiasedLocking) {
4127 UseOptoBiasInlining = false;
4128 }
4129 #endif
4130
4131 return JNI_OK;
4132 }
4133
4134 jint Arguments::adjust_after_os() {
4135 if (UseNUMA) {
4136 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4137 FLAG_SET_ERGO(UseNUMA, false);
4138 } else if (UseParallelGC || UseParallelOldGC) {
4139 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4140 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4141 }
4142 }
4143 // UseNUMAInterleaving is set to ON for all collectors and platforms when
4144 // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and
4145 // survivor spaces on top of NUMA allocation policy for the eden space.
4146 // Non NUMA-aware collectors will interleave all of the heap spaces across
4147 // NUMA nodes.
4148 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4149 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4150 }
4151 }
4152 return JNI_OK;
4153 }
4154
4155 int Arguments::PropertyList_count(SystemProperty* pl) {
4156 int count = 0;
4157 while(pl != NULL) {
4158 count++;
4159 pl = pl->next();
4160 }
4161 return count;
4162 }
4163
4164 // Return the number of readable properties.
4165 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4166 int count = 0;
4167 while(pl != NULL) {
4168 if (pl->is_readable()) {
4169 count++;
4170 }
4171 pl = pl->next();
4172 }
4173 return count;
4174 }
4175
4176 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4177 assert(key != NULL, "just checking");
4178 SystemProperty* prop;
4179 for (prop = pl; prop != NULL; prop = prop->next()) {
4180 if (strcmp(key, prop->key()) == 0) return prop->value();
4181 }
4182 return NULL;
4183 }
4184
4185 // Return the value of the requested property provided that it is a readable property.
4186 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4187 assert(key != NULL, "just checking");
4188 SystemProperty* prop;
4189 // Return the property value if the keys match and the property is not internal or
4190 // it's the special internal property "jdk.boot.class.path.append".
4191 for (prop = pl; prop != NULL; prop = prop->next()) {
4192 if (strcmp(key, prop->key()) == 0) {
4193 if (!prop->internal()) {
4194 return prop->value();
4195 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4196 return prop->value();
4197 } else {
4198 // Property is internal and not jdk.boot.class.path.append so return NULL.
4199 return NULL;
4200 }
4201 }
4202 }
4203 return NULL;
4204 }
4205
4206 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4207 int count = 0;
4208 const char* ret_val = NULL;
4209
4210 while(pl != NULL) {
4211 if(count >= index) {
4212 ret_val = pl->key();
4213 break;
4214 }
4215 count++;
4216 pl = pl->next();
4217 }
4218
4219 return ret_val;
4220 }
4221
4222 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4223 int count = 0;
4224 char* ret_val = NULL;
4225
4226 while(pl != NULL) {
4227 if(count >= index) {
4228 ret_val = pl->value();
4229 break;
4230 }
4231 count++;
4232 pl = pl->next();
4233 }
4234
4235 return ret_val;
4236 }
4237
4238 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4239 SystemProperty* p = *plist;
4240 if (p == NULL) {
4241 *plist = new_p;
4242 } else {
4243 while (p->next() != NULL) {
4244 p = p->next();
4245 }
4246 p->set_next(new_p);
4247 }
4248 }
4249
4250 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4251 bool writeable, bool internal) {
4252 if (plist == NULL)
4253 return;
4254
4255 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4256 PropertyList_add(plist, new_p);
4257 }
4258
4259 void Arguments::PropertyList_add(SystemProperty *element) {
4260 PropertyList_add(&_system_properties, element);
4261 }
4262
4263 // This add maintains unique property key in the list.
4264 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4265 PropertyAppendable append, PropertyWriteable writeable,
4266 PropertyInternal internal) {
4267 if (plist == NULL)
4268 return;
4269
4270 // If property key exist then update with new value.
4271 SystemProperty* prop;
4272 for (prop = *plist; prop != NULL; prop = prop->next()) {
4273 if (strcmp(k, prop->key()) == 0) {
4274 if (append == AppendProperty) {
4275 prop->append_value(v);
4276 } else {
4277 prop->set_value(v);
4278 }
4279 return;
4280 }
4281 }
4282
4283 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4284 }
4285
4286 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4287 // Returns true if all of the source pointed by src has been copied over to
4288 // the destination buffer pointed by buf. Otherwise, returns false.
4289 // Notes:
4290 // 1. If the length (buflen) of the destination buffer excluding the
4291 // NULL terminator character is not long enough for holding the expanded
4292 // pid characters, it also returns false instead of returning the partially
4293 // expanded one.
4294 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4295 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4296 char* buf, size_t buflen) {
4297 const char* p = src;
4298 char* b = buf;
4299 const char* src_end = &src[srclen];
4300 char* buf_end = &buf[buflen - 1];
4301
4302 while (p < src_end && b < buf_end) {
4303 if (*p == '%') {
4304 switch (*(++p)) {
4305 case '%': // "%%" ==> "%"
4306 *b++ = *p++;
4307 break;
4308 case 'p': { // "%p" ==> current process id
4309 // buf_end points to the character before the last character so
4310 // that we could write '\0' to the end of the buffer.
4311 size_t buf_sz = buf_end - b + 1;
4312 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4313
4314 // if jio_snprintf fails or the buffer is not long enough to hold
4315 // the expanded pid, returns false.
4316 if (ret < 0 || ret >= (int)buf_sz) {
4317 return false;
4318 } else {
4319 b += ret;
4320 assert(*b == '\0', "fail in copy_expand_pid");
4321 if (p == src_end && b == buf_end + 1) {
4322 // reach the end of the buffer.
4323 return true;
4324 }
4325 }
4326 p++;
4327 break;
4328 }
4329 default :
4330 *b++ = '%';
4331 }
4332 } else {
4333 *b++ = *p++;
4334 }
4335 }
4336 *b = '\0';
4337 return (p == src_end); // return false if not all of the source was copied
4338 }