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 // Note: This is a special bug reporting site for the JVM
64 #ifdef VENDOR_URL_VM_BUG
65 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
66 #else
67 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
68 #endif
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 size_t Arguments::_conservative_max_heap_alignment = 0;
80 Arguments::Mode Arguments::_mode = _mixed;
81 bool Arguments::_java_compiler = false;
82 bool Arguments::_xdebug_mode = false;
83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85 int Arguments::_sun_java_launcher_pid = -1;
86 bool Arguments::_sun_java_launcher_is_altjvm = false;
87
88 // These parameters are reset in method parse_vm_init_args()
89 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
90 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
91 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
92 bool Arguments::_ClipInlining = ClipInlining;
93 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
94 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
95
96 bool Arguments::_enable_preview = false;
97
98 char* Arguments::SharedArchivePath = NULL;
99 char* Arguments::SharedDynamicArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 // These are not set by the JDK's built-in launchers, but they can be set by
105 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
106 // JavaVMOption in jni.h.
107 abort_hook_t Arguments::_abort_hook = NULL;
108 exit_hook_t Arguments::_exit_hook = NULL;
109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
110
111
112 SystemProperty *Arguments::_sun_boot_library_path = NULL;
113 SystemProperty *Arguments::_java_library_path = NULL;
114 SystemProperty *Arguments::_java_home = NULL;
115 SystemProperty *Arguments::_java_class_path = NULL;
116 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
117 SystemProperty *Arguments::_vm_info = NULL;
118
119 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
120 PathString *Arguments::_system_boot_class_path = NULL;
121 bool Arguments::_has_jimage = false;
122
123 char* Arguments::_ext_dirs = NULL;
124
125 bool PathString::set_value(const char *value) {
126 if (_value != NULL) {
127 FreeHeap(_value);
128 }
129 _value = AllocateHeap(strlen(value)+1, mtArguments);
130 assert(_value != NULL, "Unable to allocate space for new path value");
131 if (_value != NULL) {
132 strcpy(_value, value);
133 } else {
134 // not able to allocate
135 return false;
136 }
137 return true;
138 }
139
140 void PathString::append_value(const char *value) {
141 char *sp;
142 size_t len = 0;
143 if (value != NULL) {
144 len = strlen(value);
145 if (_value != NULL) {
146 len += strlen(_value);
147 }
148 sp = AllocateHeap(len+2, mtArguments);
149 assert(sp != NULL, "Unable to allocate space for new append path value");
150 if (sp != NULL) {
151 if (_value != NULL) {
152 strcpy(sp, _value);
153 strcat(sp, os::path_separator());
154 strcat(sp, value);
155 FreeHeap(_value);
156 } else {
157 strcpy(sp, value);
158 }
159 _value = sp;
160 }
161 }
162 }
163
164 PathString::PathString(const char* value) {
165 if (value == NULL) {
166 _value = NULL;
167 } else {
168 _value = AllocateHeap(strlen(value)+1, mtArguments);
169 strcpy(_value, value);
170 }
171 }
172
173 PathString::~PathString() {
174 if (_value != NULL) {
175 FreeHeap(_value);
176 _value = NULL;
177 }
178 }
179
180 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
181 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
182 size_t len = strlen(module_name) + 1;
183 _module_name = AllocateHeap(len, mtInternal);
184 strncpy(_module_name, module_name, len); // copy the trailing null
185 _path = new PathString(path);
186 }
187
188 ModulePatchPath::~ModulePatchPath() {
189 if (_module_name != NULL) {
190 FreeHeap(_module_name);
191 _module_name = NULL;
192 }
193 if (_path != NULL) {
194 delete _path;
195 _path = NULL;
196 }
197 }
198
199 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
200 if (key == NULL) {
201 _key = NULL;
202 } else {
203 _key = AllocateHeap(strlen(key)+1, mtArguments);
204 strcpy(_key, key);
205 }
206 _next = NULL;
207 _internal = internal;
208 _writeable = writeable;
209 }
210
211 AgentLibrary::AgentLibrary(const char* name, const char* options,
212 bool is_absolute_path, void* os_lib,
213 bool instrument_lib) {
214 _name = AllocateHeap(strlen(name)+1, mtArguments);
215 strcpy(_name, name);
216 if (options == NULL) {
217 _options = NULL;
218 } else {
219 _options = AllocateHeap(strlen(options)+1, mtArguments);
220 strcpy(_options, options);
221 }
222 _is_absolute_path = is_absolute_path;
223 _os_lib = os_lib;
224 _next = NULL;
225 _state = agent_invalid;
226 _is_static_lib = false;
227 _is_instrument_lib = instrument_lib;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = NULL;
246 bool result = match_option(option, name, &tail);
247 if (tail != NULL && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != NULL; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 #if INCLUDE_JFR
270 static bool _has_jfr_option = false; // is using JFR
271
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285
286 bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288 }
289 #endif
290
291 static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295 }
296
297 bool needs_module_property_warning = false;
298
299 #define MODULE_PROPERTY_PREFIX "jdk.module."
300 #define MODULE_PROPERTY_PREFIX_LEN 11
301 #define ADDEXPORTS "addexports"
302 #define ADDEXPORTS_LEN 10
303 #define ADDREADS "addreads"
304 #define ADDREADS_LEN 8
305 #define ADDOPENS "addopens"
306 #define ADDOPENS_LEN 8
307 #define PATCH "patch"
308 #define PATCH_LEN 5
309 #define ADDMODS "addmods"
310 #define ADDMODS_LEN 7
311 #define LIMITMODS "limitmods"
312 #define LIMITMODS_LEN 9
313 #define PATH "path"
314 #define PATH_LEN 4
315 #define UPGRADE_PATH "upgrade.path"
316 #define UPGRADE_PATH_LEN 12
317
318 void Arguments::add_init_library(const char* name, char* options) {
319 _libraryList.add(new AgentLibrary(name, options, false, NULL));
320 }
321
322 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
323 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
324 }
325
326 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
327 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
328 }
329
330 // Late-binding agents not started via arguments
331 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
332 _agentList.add(agentLib);
333 }
334
335 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
336 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
337 return ((strncmp(option, property, len) == 0) &&
338 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
339 }
340
341 // Return true if property starts with "jdk.module." and its ensuing chars match
342 // any of the reserved module properties.
343 // property should be passed without the leading "-D".
344 bool Arguments::is_internal_module_property(const char* property) {
345 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
346 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
347 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
348 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
349 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
350 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
351 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
352 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
353 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
354 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
355 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
356 return true;
357 }
358 }
359 return false;
360 }
361
362 // Process java launcher properties.
363 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
364 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
365 // sun.java.launcher.pid is defined.
366 // Must do this before setting up other system properties,
367 // as some of them may depend on launcher type.
368 for (int index = 0; index < args->nOptions; index++) {
369 const JavaVMOption* option = args->options + index;
370 const char* tail;
371
372 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
373 process_java_launcher_argument(tail, option->extraInfo);
374 continue;
375 }
376 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
377 if (strcmp(tail, "true") == 0) {
378 _sun_java_launcher_is_altjvm = true;
379 }
380 continue;
381 }
382 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
383 _sun_java_launcher_pid = atoi(tail);
384 continue;
385 }
386 }
387 }
388
389 // Initialize system properties key and value.
390 void Arguments::init_system_properties() {
391
392 // Set up _system_boot_class_path which is not a property but
393 // relies heavily on argument processing and the jdk.boot.class.path.append
394 // property. It is used to store the underlying system boot class path.
395 _system_boot_class_path = new PathString(NULL);
396
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
398 "Java Virtual Machine Specification", false));
399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
402
403 // Initialize the vm.info now, but it will need updating after argument parsing.
404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
405
406 // Following are JVMTI agent writable properties.
407 // Properties values are set to NULL and they are
408 // os specific they are initialized in os::init_system_properties_values().
409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
410 _java_library_path = new SystemProperty("java.library.path", NULL, true);
411 _java_home = new SystemProperty("java.home", NULL, true);
412 _java_class_path = new SystemProperty("java.class.path", "", true);
413 // jdk.boot.class.path.append is a non-writeable, internal property.
414 // It can only be set by either:
415 // - -Xbootclasspath/a:
416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
418
419 // Add to System Property list.
420 PropertyList_add(&_system_properties, _sun_boot_library_path);
421 PropertyList_add(&_system_properties, _java_library_path);
422 PropertyList_add(&_system_properties, _java_home);
423 PropertyList_add(&_system_properties, _java_class_path);
424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
425 PropertyList_add(&_system_properties, _vm_info);
426
427 // Set OS specific system properties values
428 os::init_system_properties_values();
429 }
430
431 // Update/Initialize System properties after JDK version number is known
432 void Arguments::init_version_specific_system_properties() {
433 enum { bufsz = 16 };
434 char buffer[bufsz];
435 const char* spec_vendor = "Oracle Corporation";
436 uint32_t spec_version = JDK_Version::current().major_version();
437
438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
439
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.specification.version", buffer, false));
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
446 }
447
448 /*
449 * -XX argument processing:
450 *
451 * -XX arguments are defined in several places, such as:
452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
453 * -XX arguments are parsed in parse_argument().
454 * -XX argument bounds checking is done in check_vm_args_consistency().
455 *
456 * Over time -XX arguments may change. There are mechanisms to handle common cases:
457 *
458 * ALIASED: An option that is simply another name for another option. This is often
459 * part of the process of deprecating a flag, but not all aliases need
460 * to be deprecated.
461 *
462 * Create an alias for an option by adding the old and new option names to the
463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
464 *
465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
466 * support may be removed in the future. Both regular and aliased options may be
467 * deprecated.
468 *
469 * Add a deprecation warning for an option (or alias) by adding an entry in the
470 * "special_jvm_flags" table and setting the "deprecated_in" field.
471 * Often an option "deprecated" in one major release will
472 * be made "obsolete" in the next. In this case the entry should also have its
473 * "obsolete_in" field set.
474 *
475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
476 * on the command line. A warning is printed to let the user know that option might not
477 * be accepted in the future.
478 *
479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
480 * table and setting the "obsolete_in" field.
481 *
482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
483 * to the current JDK version. The system will flatly refuse to admit the existence of
484 * the flag. This allows a flag to die automatically over JDK releases.
485 *
486 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
488 * - Newly obsolete or expired deprecated options should have their global variable
489 * definitions removed (from globals.hpp, etc) and related implementations removed.
490 *
491 * Recommended approach for removing options:
492 *
493 * To remove options commonly used by customers (e.g. product -XX options), use
494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
495 *
496 * To remove internal options (e.g. diagnostic, experimental, develop options), use
497 * a 2-step model adding major release numbers to the obsolete and expire columns.
498 *
499 * To change the name of an option, use the alias table as well as a 2-step
500 * model adding major release numbers to the deprecate and expire columns.
501 * Think twice about aliasing commonly used customer options.
502 *
503 * There are times when it is appropriate to leave a future release number as undefined.
504 *
505 * Tests: Aliases should be tested in VMAliasOptions.java.
506 * Deprecated options should be tested in VMDeprecatedOptions.java.
507 */
508
509 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
510 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
511 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
512 // the command-line as usual, but will issue a warning.
513 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
514 // the command-line, while issuing a warning and ignoring the flag value.
515 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
516 // existence of the flag.
517 //
518 // MANUAL CLEANUP ON JDK VERSION UPDATES:
519 // This table ensures that the handling of options will update automatically when the JDK
520 // version is incremented, but the source code needs to be cleanup up manually:
521 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
522 // variable should be removed, as well as users of the variable.
523 // - As "deprecated" options age into "obsolete" options, move the entry into the
524 // "Obsolete Flags" section of the table.
525 // - All expired options should be removed from the table.
526 static SpecialFlag const special_jvm_flags[] = {
527 // -------------- Deprecated Flags --------------
528 // --- Non-alias flags - sorted by obsolete_in then expired_in:
529 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
535 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() },
536 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
537 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
538 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
540 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
541 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
542
543 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
544 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
545 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
546 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
547
548 // -------------- Obsolete Flags - sorted by expired_in --------------
549 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
550 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
551 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
552 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
553 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
554 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
555 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
556 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
557 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
558
559 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
560 // These entries will generate build errors. Their purpose is to test the macros.
561 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
562 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
563 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
564 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
565 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
566 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
567 #endif
568
569 { NULL, JDK_Version(0), JDK_Version(0) }
570 };
571
572 // Flags that are aliases for other flags.
573 typedef struct {
574 const char* alias_name;
575 const char* real_name;
576 } AliasedFlag;
577
578 static AliasedFlag const aliased_jvm_flags[] = {
579 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
580 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
581 { NULL, NULL}
582 };
583
584 // NOTE: A compatibility request will be necessary for each alias to be removed.
585 static AliasedLoggingFlag const aliased_logging_flags[] = {
586 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
587 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
588 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
589 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
590 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
591 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
592 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
593 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
594 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
595 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
596 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
597 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
598 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
599 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
600 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) },
601 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
602 };
603
604 #ifndef PRODUCT
605 // These options are removed in jdk9. Remove this code for jdk10.
606 static AliasedFlag const removed_develop_logging_flags[] = {
607 { "TraceClassInitialization", "-Xlog:class+init" },
608 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
609 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
610 { "TraceItables", "-Xlog:itables=debug" },
611 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
612 { "TraceSafepoint", "-Xlog:safepoint=debug" },
613 { "TraceStartupTime", "-Xlog:startuptime" },
614 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
615 { "PrintVtables", "-Xlog:vtables=debug" },
616 { "VerboseVerification", "-Xlog:verification" },
617 { NULL, NULL }
618 };
619 #endif //PRODUCT
620
621 // Return true if "v" is less than "other", where "other" may be "undefined".
622 static bool version_less_than(JDK_Version v, JDK_Version other) {
623 assert(!v.is_undefined(), "must be defined");
624 if (!other.is_undefined() && v.compare(other) >= 0) {
625 return false;
626 } else {
627 return true;
628 }
629 }
630
631 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
632 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
633 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
634 flag = special_jvm_flags[i];
635 return true;
636 }
637 }
638 return false;
639 }
640
641 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
642 assert(version != NULL, "Must provide a version buffer");
643 SpecialFlag flag;
644 if (lookup_special_flag(flag_name, flag)) {
645 if (!flag.obsolete_in.is_undefined()) {
646 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
647 *version = flag.obsolete_in;
648 return true;
649 }
650 }
651 }
652 return false;
653 }
654
655 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
656 assert(version != NULL, "Must provide a version buffer");
657 SpecialFlag flag;
658 if (lookup_special_flag(flag_name, flag)) {
659 if (!flag.deprecated_in.is_undefined()) {
660 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
661 version_less_than(JDK_Version::current(), flag.expired_in)) {
662 *version = flag.deprecated_in;
663 return 1;
664 } else {
665 return -1;
666 }
667 }
668 }
669 return 0;
670 }
671
672 #ifndef PRODUCT
673 const char* Arguments::removed_develop_logging_flag_name(const char* name){
674 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
675 const AliasedFlag& flag = removed_develop_logging_flags[i];
676 if (strcmp(flag.alias_name, name) == 0) {
677 return flag.real_name;
678 }
679 }
680 return NULL;
681 }
682 #endif // PRODUCT
683
684 const char* Arguments::real_flag_name(const char *flag_name) {
685 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
686 const AliasedFlag& flag_status = aliased_jvm_flags[i];
687 if (strcmp(flag_status.alias_name, flag_name) == 0) {
688 return flag_status.real_name;
689 }
690 }
691 return flag_name;
692 }
693
694 #ifdef ASSERT
695 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
696 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
697 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
698 return true;
699 }
700 }
701 return false;
702 }
703
704 // Verifies the correctness of the entries in the special_jvm_flags table.
705 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
706 // version being earlier than the deprecation version, then a warning is issued
707 // and verification fails - by returning false. If it is detected that the table
708 // is out of date, with respect to the current version, then a warning is issued
709 // but verification does not fail. This allows the VM to operate when the version
710 // is first updated, without needing to update all the impacted flags at the
711 // same time.
712 static bool verify_special_jvm_flags() {
713 bool success = true;
714 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
715 const SpecialFlag& flag = special_jvm_flags[i];
716 if (lookup_special_flag(flag.name, i)) {
717 warning("Duplicate special flag declaration \"%s\"", flag.name);
718 success = false;
719 }
720 if (flag.deprecated_in.is_undefined() &&
721 flag.obsolete_in.is_undefined()) {
722 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
723 success = false;
724 }
725
726 if (!flag.deprecated_in.is_undefined()) {
727 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
728 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
729 success = false;
730 }
731
732 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
733 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
734 success = false;
735 }
736 }
737
738 if (!flag.obsolete_in.is_undefined()) {
739 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
740 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
741 success = false;
742 }
743
744 // if flag has become obsolete it should not have a "globals" flag defined anymore.
745 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
746 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
747 // Temporarily disable the warning: 8196739
748 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
749 }
750 }
751 }
752
753 if (!flag.expired_in.is_undefined()) {
754 // if flag has become expired it should not have a "globals" flag defined anymore.
755 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
756 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
757 // Temporarily disable the warning: 8196739
758 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
759 }
760 }
761 }
762
763 }
764 return success;
765 }
766 #endif
767
768 // Parses a size specification string.
769 bool Arguments::atojulong(const char *s, julong* result) {
770 julong n = 0;
771
772 // First char must be a digit. Don't allow negative numbers or leading spaces.
773 if (!isdigit(*s)) {
774 return false;
775 }
776
777 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
778 char* remainder;
779 errno = 0;
780 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
781 if (errno != 0) {
782 return false;
783 }
784
785 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
786 if (remainder == s || strlen(remainder) > 1) {
787 return false;
788 }
789
790 switch (*remainder) {
791 case 'T': case 't':
792 *result = n * G * K;
793 // Check for overflow.
794 if (*result/((julong)G * K) != n) return false;
795 return true;
796 case 'G': case 'g':
797 *result = n * G;
798 if (*result/G != n) return false;
799 return true;
800 case 'M': case 'm':
801 *result = n * M;
802 if (*result/M != n) return false;
803 return true;
804 case 'K': case 'k':
805 *result = n * K;
806 if (*result/K != n) return false;
807 return true;
808 case '\0':
809 *result = n;
810 return true;
811 default:
812 return false;
813 }
814 }
815
816 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
817 if (size < min_size) return arg_too_small;
818 if (size > max_size) return arg_too_big;
819 return arg_in_range;
820 }
821
822 // Describe an argument out of range error
823 void Arguments::describe_range_error(ArgsRange errcode) {
824 switch(errcode) {
825 case arg_too_big:
826 jio_fprintf(defaultStream::error_stream(),
827 "The specified size exceeds the maximum "
828 "representable size.\n");
829 break;
830 case arg_too_small:
831 case arg_unreadable:
832 case arg_in_range:
833 // do nothing for now
834 break;
835 default:
836 ShouldNotReachHere();
837 }
838 }
839
840 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
841 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
842 return true;
843 } else {
844 return false;
845 }
846 }
847
848 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
849 char* end;
850 errno = 0;
851 double v = strtod(value, &end);
852 if ((errno != 0) || (*end != 0)) {
853 return false;
854 }
855
856 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
857 return true;
858 }
859 return false;
860 }
861
862 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
863 julong v;
864 int int_v;
865 intx intx_v;
866 bool is_neg = false;
867
868 if (flag == NULL) {
869 return false;
870 }
871
872 // Check the sign first since atojulong() parses only unsigned values.
873 if (*value == '-') {
874 if (!flag->is_intx() && !flag->is_int()) {
875 return false;
876 }
877 value++;
878 is_neg = true;
879 }
880 if (!Arguments::atojulong(value, &v)) {
881 return false;
882 }
883 if (flag->is_int()) {
884 int_v = (int) v;
885 if (is_neg) {
886 int_v = -int_v;
887 }
888 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
889 } else if (flag->is_uint()) {
890 uint uint_v = (uint) v;
891 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
892 } else if (flag->is_intx()) {
893 intx_v = (intx) v;
894 if (is_neg) {
895 intx_v = -intx_v;
896 }
897 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
898 } else if (flag->is_uintx()) {
899 uintx uintx_v = (uintx) v;
900 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
901 } else if (flag->is_uint64_t()) {
902 uint64_t uint64_t_v = (uint64_t) v;
903 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
904 } else if (flag->is_size_t()) {
905 size_t size_t_v = (size_t) v;
906 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
907 } else if (flag->is_double()) {
908 double double_v = (double) v;
909 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
910 } else {
911 return false;
912 }
913 }
914
915 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
916 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
917 // Contract: JVMFlag always returns a pointer that needs freeing.
918 FREE_C_HEAP_ARRAY(char, value);
919 return true;
920 }
921
922 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
923 const char* old_value = "";
924 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
925 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
926 size_t new_len = strlen(new_value);
927 const char* value;
928 char* free_this_too = NULL;
929 if (old_len == 0) {
930 value = new_value;
931 } else if (new_len == 0) {
932 value = old_value;
933 } else {
934 size_t length = old_len + 1 + new_len + 1;
935 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
936 // each new setting adds another LINE to the switch:
937 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
938 value = buf;
939 free_this_too = buf;
940 }
941 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
942 // JVMFlag always returns a pointer that needs freeing.
943 FREE_C_HEAP_ARRAY(char, value);
944 if (free_this_too != NULL) {
945 // JVMFlag made its own copy, so I must delete my own temp. buffer.
946 FREE_C_HEAP_ARRAY(char, free_this_too);
947 }
948 return true;
949 }
950
951 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
952 const char* real_name = real_flag_name(arg);
953 JDK_Version since = JDK_Version();
954 switch (is_deprecated_flag(arg, &since)) {
955 case -1:
956 return NULL; // obsolete or expired, don't process normally
957 case 0:
958 return real_name;
959 case 1: {
960 if (warn) {
961 char version[256];
962 since.to_string(version, sizeof(version));
963 if (real_name != arg) {
964 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
965 arg, version, real_name);
966 } else {
967 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
968 arg, version);
969 }
970 }
971 return real_name;
972 }
973 }
974 ShouldNotReachHere();
975 return NULL;
976 }
977
978 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
979 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
980 // Set tagset string buffer at max size of 256, large enough for any alias tagset
981 const int max_tagset_size = 256;
982 int max_tagset_len = max_tagset_size - 1;
983 char tagset_buffer[max_tagset_size];
984 tagset_buffer[0] = '\0';
985
986 // Write tag-set for aliased logging option, in string list form
987 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
988 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
989 if (i > 0) {
990 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
991 }
992 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
993 }
994 if (!alf.exactMatch) {
995 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
996 }
997 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
998 (on) ? "+" : "-",
999 name,
1000 tagset_buffer,
1001 (on) ? LogLevel::name(alf.level) : "off");
1002 }
1003
1004 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1005 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1006 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1007 if (strcmp(alf.alias_name, name) == 0) {
1008 log_deprecated_flag(name, on, alf);
1009 return alf;
1010 }
1011 }
1012 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1013 return a;
1014 }
1015
1016 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1017
1018 // range of acceptable characters spelled out for portability reasons
1019 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1020 #define BUFLEN 255
1021 char name[BUFLEN+1];
1022 char dummy;
1023 const char* real_name;
1024 bool warn_if_deprecated = true;
1025
1026 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1027 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1028 if (alf.alias_name != NULL){
1029 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1030 return true;
1031 }
1032 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1033 if (real_name == NULL) {
1034 return false;
1035 }
1036 JVMFlag* flag = JVMFlag::find_flag(real_name);
1037 return set_bool_flag(flag, false, origin);
1038 }
1039 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1040 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1041 if (alf.alias_name != NULL){
1042 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1043 return true;
1044 }
1045 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1046 if (real_name == NULL) {
1047 return false;
1048 }
1049 JVMFlag* flag = JVMFlag::find_flag(real_name);
1050 return set_bool_flag(flag, true, origin);
1051 }
1052
1053 char punct;
1054 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1055 const char* value = strchr(arg, '=') + 1;
1056
1057 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1058 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1059 if (alf.alias_name != NULL) {
1060 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1061 return true;
1062 }
1063 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1064 if (real_name == NULL) {
1065 return false;
1066 }
1067 JVMFlag* flag = JVMFlag::find_flag(real_name);
1068 if (flag != NULL && flag->is_ccstr()) {
1069 if (flag->ccstr_accumulates()) {
1070 return append_to_string_flag(flag, value, origin);
1071 } else {
1072 if (value[0] == '\0') {
1073 value = NULL;
1074 }
1075 return set_string_flag(flag, value, origin);
1076 }
1077 } else {
1078 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1079 }
1080 }
1081
1082 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1083 const char* value = strchr(arg, '=') + 1;
1084 // -XX:Foo:=xxx will reset the string flag to the given value.
1085 if (value[0] == '\0') {
1086 value = NULL;
1087 }
1088 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1089 if (real_name == NULL) {
1090 return false;
1091 }
1092 JVMFlag* flag = JVMFlag::find_flag(real_name);
1093 return set_string_flag(flag, value, origin);
1094 }
1095
1096 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1097 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1098 #define NUMBER_RANGE "[0123456789eE+-]"
1099 char value[BUFLEN + 1];
1100 char value2[BUFLEN + 1];
1101 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1102 // Looks like a floating-point number -- try again with more lenient format string
1103 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1104 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1105 if (real_name == NULL) {
1106 return false;
1107 }
1108 JVMFlag* flag = JVMFlag::find_flag(real_name);
1109 return set_fp_numeric_flag(flag, value, origin);
1110 }
1111 }
1112
1113 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1114 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1115 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1116 if (real_name == NULL) {
1117 return false;
1118 }
1119 JVMFlag* flag = JVMFlag::find_flag(real_name);
1120 return set_numeric_flag(flag, value, origin);
1121 }
1122
1123 return false;
1124 }
1125
1126 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1127 assert(bldarray != NULL, "illegal argument");
1128
1129 if (arg == NULL) {
1130 return;
1131 }
1132
1133 int new_count = *count + 1;
1134
1135 // expand the array and add arg to the last element
1136 if (*bldarray == NULL) {
1137 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1138 } else {
1139 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1140 }
1141 (*bldarray)[*count] = os::strdup_check_oom(arg);
1142 *count = new_count;
1143 }
1144
1145 void Arguments::build_jvm_args(const char* arg) {
1146 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1147 }
1148
1149 void Arguments::build_jvm_flags(const char* arg) {
1150 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1151 }
1152
1153 // utility function to return a string that concatenates all
1154 // strings in a given char** array
1155 const char* Arguments::build_resource_string(char** args, int count) {
1156 if (args == NULL || count == 0) {
1157 return NULL;
1158 }
1159 size_t length = 0;
1160 for (int i = 0; i < count; i++) {
1161 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1162 }
1163 char* s = NEW_RESOURCE_ARRAY(char, length);
1164 char* dst = s;
1165 for (int j = 0; j < count; j++) {
1166 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1167 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1168 dst += offset;
1169 length -= offset;
1170 }
1171 return (const char*) s;
1172 }
1173
1174 void Arguments::print_on(outputStream* st) {
1175 st->print_cr("VM Arguments:");
1176 if (num_jvm_flags() > 0) {
1177 st->print("jvm_flags: "); print_jvm_flags_on(st);
1178 st->cr();
1179 }
1180 if (num_jvm_args() > 0) {
1181 st->print("jvm_args: "); print_jvm_args_on(st);
1182 st->cr();
1183 }
1184 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1185 if (_java_class_path != NULL) {
1186 char* path = _java_class_path->value();
1187 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1188 }
1189 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1190 }
1191
1192 void Arguments::print_summary_on(outputStream* st) {
1193 // Print the command line. Environment variables that are helpful for
1194 // reproducing the problem are written later in the hs_err file.
1195 // flags are from setting file
1196 if (num_jvm_flags() > 0) {
1197 st->print_raw("Settings File: ");
1198 print_jvm_flags_on(st);
1199 st->cr();
1200 }
1201 // args are the command line and environment variable arguments.
1202 st->print_raw("Command Line: ");
1203 if (num_jvm_args() > 0) {
1204 print_jvm_args_on(st);
1205 }
1206 // this is the classfile and any arguments to the java program
1207 if (java_command() != NULL) {
1208 st->print("%s", java_command());
1209 }
1210 st->cr();
1211 }
1212
1213 void Arguments::print_jvm_flags_on(outputStream* st) {
1214 if (_num_jvm_flags > 0) {
1215 for (int i=0; i < _num_jvm_flags; i++) {
1216 st->print("%s ", _jvm_flags_array[i]);
1217 }
1218 }
1219 }
1220
1221 void Arguments::print_jvm_args_on(outputStream* st) {
1222 if (_num_jvm_args > 0) {
1223 for (int i=0; i < _num_jvm_args; i++) {
1224 st->print("%s ", _jvm_args_array[i]);
1225 }
1226 }
1227 }
1228
1229 bool Arguments::process_argument(const char* arg,
1230 jboolean ignore_unrecognized,
1231 JVMFlag::Flags origin) {
1232 JDK_Version since = JDK_Version();
1233
1234 if (parse_argument(arg, origin)) {
1235 return true;
1236 }
1237
1238 // Determine if the flag has '+', '-', or '=' characters.
1239 bool has_plus_minus = (*arg == '+' || *arg == '-');
1240 const char* const argname = has_plus_minus ? arg + 1 : arg;
1241
1242 size_t arg_len;
1243 const char* equal_sign = strchr(argname, '=');
1244 if (equal_sign == NULL) {
1245 arg_len = strlen(argname);
1246 } else {
1247 arg_len = equal_sign - argname;
1248 }
1249
1250 // Only make the obsolete check for valid arguments.
1251 if (arg_len <= BUFLEN) {
1252 // Construct a string which consists only of the argument name without '+', '-', or '='.
1253 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1254 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1255 if (is_obsolete_flag(stripped_argname, &since)) {
1256 char version[256];
1257 since.to_string(version, sizeof(version));
1258 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1259 return true;
1260 }
1261 #ifndef PRODUCT
1262 else {
1263 const char* replacement;
1264 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1265 log_warning(arguments)("%s has been removed. Please use %s instead.",
1266 stripped_argname,
1267 replacement);
1268 return false;
1269 }
1270 }
1271 #endif //PRODUCT
1272 }
1273
1274 // For locked flags, report a custom error message if available.
1275 // Otherwise, report the standard unrecognized VM option.
1276 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1277 if (found_flag != NULL) {
1278 char locked_message_buf[BUFLEN];
1279 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1280 if (strlen(locked_message_buf) == 0) {
1281 if (found_flag->is_bool() && !has_plus_minus) {
1282 jio_fprintf(defaultStream::error_stream(),
1283 "Missing +/- setting for VM option '%s'\n", argname);
1284 } else if (!found_flag->is_bool() && has_plus_minus) {
1285 jio_fprintf(defaultStream::error_stream(),
1286 "Unexpected +/- setting in VM option '%s'\n", argname);
1287 } else {
1288 jio_fprintf(defaultStream::error_stream(),
1289 "Improperly specified VM option '%s'\n", argname);
1290 }
1291 } else {
1292 #ifdef PRODUCT
1293 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1294 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1295 if (ignore_unrecognized && mismatched) {
1296 return true;
1297 }
1298 #endif
1299 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1300 }
1301 } else {
1302 if (ignore_unrecognized) {
1303 return true;
1304 }
1305 jio_fprintf(defaultStream::error_stream(),
1306 "Unrecognized VM option '%s'\n", argname);
1307 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1308 if (fuzzy_matched != NULL) {
1309 jio_fprintf(defaultStream::error_stream(),
1310 "Did you mean '%s%s%s'? ",
1311 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1312 fuzzy_matched->_name,
1313 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1314 }
1315 }
1316
1317 // allow for commandline "commenting out" options like -XX:#+Verbose
1318 return arg[0] == '#';
1319 }
1320
1321 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1322 FILE* stream = fopen(file_name, "rb");
1323 if (stream == NULL) {
1324 if (should_exist) {
1325 jio_fprintf(defaultStream::error_stream(),
1326 "Could not open settings file %s\n", file_name);
1327 return false;
1328 } else {
1329 return true;
1330 }
1331 }
1332
1333 char token[1024];
1334 int pos = 0;
1335
1336 bool in_white_space = true;
1337 bool in_comment = false;
1338 bool in_quote = false;
1339 char quote_c = 0;
1340 bool result = true;
1341
1342 int c = getc(stream);
1343 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1344 if (in_white_space) {
1345 if (in_comment) {
1346 if (c == '\n') in_comment = false;
1347 } else {
1348 if (c == '#') in_comment = true;
1349 else if (!isspace(c)) {
1350 in_white_space = false;
1351 token[pos++] = c;
1352 }
1353 }
1354 } else {
1355 if (c == '\n' || (!in_quote && isspace(c))) {
1356 // token ends at newline, or at unquoted whitespace
1357 // this allows a way to include spaces in string-valued options
1358 token[pos] = '\0';
1359 logOption(token);
1360 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1361 build_jvm_flags(token);
1362 pos = 0;
1363 in_white_space = true;
1364 in_quote = false;
1365 } else if (!in_quote && (c == '\'' || c == '"')) {
1366 in_quote = true;
1367 quote_c = c;
1368 } else if (in_quote && (c == quote_c)) {
1369 in_quote = false;
1370 } else {
1371 token[pos++] = c;
1372 }
1373 }
1374 c = getc(stream);
1375 }
1376 if (pos > 0) {
1377 token[pos] = '\0';
1378 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1379 build_jvm_flags(token);
1380 }
1381 fclose(stream);
1382 return result;
1383 }
1384
1385 //=============================================================================================================
1386 // Parsing of properties (-D)
1387
1388 const char* Arguments::get_property(const char* key) {
1389 return PropertyList_get_value(system_properties(), key);
1390 }
1391
1392 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1393 const char* eq = strchr(prop, '=');
1394 const char* key;
1395 const char* value = "";
1396
1397 if (eq == NULL) {
1398 // property doesn't have a value, thus use passed string
1399 key = prop;
1400 } else {
1401 // property have a value, thus extract it and save to the
1402 // allocated string
1403 size_t key_len = eq - prop;
1404 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1405
1406 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1407 key = tmp_key;
1408
1409 value = &prop[key_len + 1];
1410 }
1411
1412 if (strcmp(key, "java.compiler") == 0) {
1413 process_java_compiler_argument(value);
1414 // Record value in Arguments, but let it get passed to Java.
1415 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1416 strcmp(key, "sun.java.launcher.pid") == 0) {
1417 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1418 // private and are processed in process_sun_java_launcher_properties();
1419 // the sun.java.launcher property is passed on to the java application
1420 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1421 // append is true, writable is true, internal is false
1422 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1423 WriteableProperty, ExternalProperty);
1424 } else {
1425 if (strcmp(key, "sun.java.command") == 0) {
1426 char *old_java_command = _java_command;
1427 _java_command = os::strdup_check_oom(value, mtArguments);
1428 if (old_java_command != NULL) {
1429 os::free(old_java_command);
1430 }
1431 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
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 != DEFAULT_VENDOR_URL_BUG) {
1437 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1438 os::free((void *)old_java_vendor_url_bug);
1439 }
1440 }
1441
1442 // Create new property and add at the end of the list
1443 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1444 }
1445
1446 if (key != prop) {
1447 // SystemProperty copy passed value, thus free previously allocated
1448 // memory
1449 FreeHeap((void *)key);
1450 }
1451
1452 return true;
1453 }
1454
1455 #if INCLUDE_CDS
1456 const char* unsupported_properties[] = { "jdk.module.limitmods",
1457 "jdk.module.upgrade.path",
1458 "jdk.module.patch.0" };
1459 const char* unsupported_options[] = { "--limit-modules",
1460 "--upgrade-module-path",
1461 "--patch-module"
1462 };
1463 void Arguments::check_unsupported_dumping_properties() {
1464 assert(DumpSharedSpaces || DynamicDumpSharedSpaces,
1465 "this function is only used with CDS dump time");
1466 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1467 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1468 SystemProperty* sp = system_properties();
1469 while (sp != NULL) {
1470 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1471 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1472 vm_exit_during_initialization(
1473 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1474 }
1475 }
1476 sp = sp->next();
1477 }
1478
1479 // Check for an exploded module build in use with -Xshare:dump.
1480 if (!has_jimage()) {
1481 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1482 }
1483 }
1484
1485 bool Arguments::check_unsupported_cds_runtime_properties() {
1486 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1487 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1488 if (ArchiveClassesAtExit != NULL) {
1489 // dynamic dumping, just return false for now.
1490 // check_unsupported_dumping_properties() will be called later to check the same set of
1491 // properties, and will exit the VM with the correct error message if the unsupported properties
1492 // are used.
1493 return false;
1494 }
1495 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1496 if (get_property(unsupported_properties[i]) != NULL) {
1497 if (RequireSharedSpaces) {
1498 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1499 }
1500 return true;
1501 }
1502 }
1503 return false;
1504 }
1505 #endif
1506
1507 //===========================================================================================================
1508 // Setting int/mixed/comp mode flags
1509
1510 void Arguments::set_mode_flags(Mode mode) {
1511 // Set up default values for all flags.
1512 // If you add a flag to any of the branches below,
1513 // add a default value for it here.
1514 set_java_compiler(false);
1515 _mode = mode;
1516
1517 // Ensure Agent_OnLoad has the correct initial values.
1518 // This may not be the final mode; mode may change later in onload phase.
1519 PropertyList_unique_add(&_system_properties, "java.vm.info",
1520 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1521
1522 UseInterpreter = true;
1523 UseCompiler = true;
1524 UseLoopCounter = true;
1525
1526 // Default values may be platform/compiler dependent -
1527 // use the saved values
1528 ClipInlining = Arguments::_ClipInlining;
1529 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1530 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1531 BackgroundCompilation = Arguments::_BackgroundCompilation;
1532 if (TieredCompilation) {
1533 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1534 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1535 }
1536 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1537 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1538 }
1539 }
1540
1541 // Change from defaults based on mode
1542 switch (mode) {
1543 default:
1544 ShouldNotReachHere();
1545 break;
1546 case _int:
1547 UseCompiler = false;
1548 UseLoopCounter = false;
1549 AlwaysCompileLoopMethods = false;
1550 UseOnStackReplacement = false;
1551 break;
1552 case _mixed:
1553 // same as default
1554 break;
1555 case _comp:
1556 UseInterpreter = false;
1557 BackgroundCompilation = false;
1558 ClipInlining = false;
1559 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1560 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1561 // compile a level 4 (C2) and then continue executing it.
1562 if (TieredCompilation) {
1563 Tier3InvokeNotifyFreqLog = 0;
1564 Tier4InvocationThreshold = 0;
1565 }
1566 break;
1567 }
1568 }
1569
1570 // Conflict: required to use shared spaces (-Xshare:on), but
1571 // incompatible command line options were chosen.
1572 static void no_shared_spaces(const char* message) {
1573 if (RequireSharedSpaces) {
1574 jio_fprintf(defaultStream::error_stream(),
1575 "Class data sharing is inconsistent with other specified options.\n");
1576 vm_exit_during_initialization("Unable to use shared archive", message);
1577 } else {
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 !defined(COMPILER1) || defined(TIERED)
1626 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1627 FLAG_SET_ERGO(UseCompressedOops, true);
1628 }
1629 #endif
1630 } else {
1631 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1632 warning("Max heap size too large for Compressed Oops");
1633 FLAG_SET_DEFAULT(UseCompressedOops, false);
1634 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1635 }
1636 }
1637 #endif // _LP64
1638 #endif // ZERO
1639 }
1640
1641
1642 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1643 // set_use_compressed_oops().
1644 void Arguments::set_use_compressed_klass_ptrs() {
1645 #ifndef ZERO
1646 #ifdef _LP64
1647 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1648 if (!UseCompressedOops) {
1649 if (UseCompressedClassPointers) {
1650 warning("UseCompressedClassPointers requires UseCompressedOops");
1651 }
1652 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1653 } else {
1654 // Turn on UseCompressedClassPointers too
1655 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1656 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1657 }
1658 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1659 if (UseCompressedClassPointers) {
1660 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1661 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1662 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1663 }
1664 }
1665 }
1666 #endif // _LP64
1667 #endif // !ZERO
1668 }
1669
1670 void Arguments::set_conservative_max_heap_alignment() {
1671 // The conservative maximum required alignment for the heap is the maximum of
1672 // the alignments imposed by several sources: any requirements from the heap
1673 // itself and the maximum page size we may run the VM with.
1674 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1675 _conservative_max_heap_alignment = MAX4(heap_alignment,
1676 (size_t)os::vm_allocation_granularity(),
1677 os::max_page_size(),
1678 GCArguments::compute_heap_alignment());
1679 }
1680
1681 jint Arguments::set_ergonomics_flags() {
1682 GCConfig::initialize();
1683
1684 set_conservative_max_heap_alignment();
1685
1686 #ifndef ZERO
1687 #ifdef _LP64
1688 set_use_compressed_oops();
1689
1690 // set_use_compressed_klass_ptrs() must be called after calling
1691 // set_use_compressed_oops().
1692 set_use_compressed_klass_ptrs();
1693
1694 // Also checks that certain machines are slower with compressed oops
1695 // in vm_version initialization code.
1696 #endif // _LP64
1697 #endif // !ZERO
1698
1699 return JNI_OK;
1700 }
1701
1702 julong Arguments::limit_by_allocatable_memory(julong limit) {
1703 julong max_allocatable;
1704 julong result = limit;
1705 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1706 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1707 }
1708 return result;
1709 }
1710
1711 // Use static initialization to get the default before parsing
1712 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1713
1714 void Arguments::set_heap_size() {
1715 julong phys_mem;
1716
1717 // If the user specified one of these options, they
1718 // want specific memory sizing so do not limit memory
1719 // based on compressed oops addressability.
1720 // Also, memory limits will be calculated based on
1721 // available os physical memory, not our MaxRAM limit,
1722 // unless MaxRAM is also specified.
1723 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1724 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1725 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1726 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1727 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1728 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1729 !FLAG_IS_DEFAULT(MaxRAM));
1730 if (override_coop_limit) {
1731 if (FLAG_IS_DEFAULT(MaxRAM)) {
1732 phys_mem = os::physical_memory();
1733 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1734 } else {
1735 phys_mem = (julong)MaxRAM;
1736 }
1737 } else {
1738 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1739 : (julong)MaxRAM;
1740 }
1741
1742
1743 // Convert deprecated flags
1744 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1745 !FLAG_IS_DEFAULT(MaxRAMFraction))
1746 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1747
1748 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1749 !FLAG_IS_DEFAULT(MinRAMFraction))
1750 MinRAMPercentage = 100.0 / MinRAMFraction;
1751
1752 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1753 !FLAG_IS_DEFAULT(InitialRAMFraction))
1754 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1755
1756 // If the maximum heap size has not been set with -Xmx,
1757 // then set it as fraction of the size of physical memory,
1758 // respecting the maximum and minimum sizes of the heap.
1759 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1760 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1761 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1762 if (reasonable_min < MaxHeapSize) {
1763 // Small physical memory, so use a minimum fraction of it for the heap
1764 reasonable_max = reasonable_min;
1765 } else {
1766 // Not-small physical memory, so require a heap at least
1767 // as large as MaxHeapSize
1768 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1769 }
1770
1771 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1772 // Limit the heap size to ErgoHeapSizeLimit
1773 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1774 }
1775
1776 #ifdef _LP64
1777 if (UseCompressedOops) {
1778 // Limit the heap size to the maximum possible when using compressed oops
1779 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1780
1781 // HeapBaseMinAddress can be greater than default but not less than.
1782 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1783 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1784 // matches compressed oops printing flags
1785 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1786 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1787 DefaultHeapBaseMinAddress,
1788 DefaultHeapBaseMinAddress/G,
1789 HeapBaseMinAddress);
1790 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1791 }
1792 }
1793
1794 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1795 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1796 // but it should be not less than default MaxHeapSize.
1797 max_coop_heap -= HeapBaseMinAddress;
1798 }
1799
1800 // If user specified flags prioritizing os physical
1801 // memory limits, then disable compressed oops if
1802 // limits exceed max_coop_heap and UseCompressedOops
1803 // was not specified.
1804 if (reasonable_max > max_coop_heap) {
1805 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1806 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1807 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1808 "Please check the setting of MaxRAMPercentage %5.2f."
1809 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1810 FLAG_SET_ERGO(UseCompressedOops, false);
1811 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1812 } else {
1813 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1814 }
1815 }
1816 }
1817 #endif // _LP64
1818
1819 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1820
1821 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1822 // An initial heap size was specified on the command line,
1823 // so be sure that the maximum size is consistent. Done
1824 // after call to limit_by_allocatable_memory because that
1825 // method might reduce the allocation size.
1826 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1827 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1828 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1829 }
1830
1831 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1832 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1833 }
1834
1835 // If the minimum or initial heap_size have not been set or requested to be set
1836 // ergonomically, set them accordingly.
1837 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1838 julong reasonable_minimum = (julong)(OldSize + NewSize);
1839
1840 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1841
1842 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1843
1844 if (InitialHeapSize == 0) {
1845 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1846
1847 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1848 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1849
1850 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1851
1852 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1853 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1854 }
1855 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1856 // synchronize with InitialHeapSize to avoid errors with the default value.
1857 if (MinHeapSize == 0) {
1858 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1859 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1860 }
1861 }
1862 }
1863
1864 // This option inspects the machine and attempts to set various
1865 // parameters to be optimal for long-running, memory allocation
1866 // intensive jobs. It is intended for machines with large
1867 // amounts of cpu and memory.
1868 jint Arguments::set_aggressive_heap_flags() {
1869 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1870 // VM, but we may not be able to represent the total physical memory
1871 // available (like having 8gb of memory on a box but using a 32bit VM).
1872 // Thus, we need to make sure we're using a julong for intermediate
1873 // calculations.
1874 julong initHeapSize;
1875 julong total_memory = os::physical_memory();
1876
1877 if (total_memory < (julong) 256 * M) {
1878 jio_fprintf(defaultStream::error_stream(),
1879 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1880 vm_exit(1);
1881 }
1882
1883 // The heap size is half of available memory, or (at most)
1884 // all of possible memory less 160mb (leaving room for the OS
1885 // when using ISM). This is the maximum; because adaptive sizing
1886 // is turned on below, the actual space used may be smaller.
1887
1888 initHeapSize = MIN2(total_memory / (julong) 2,
1889 total_memory - (julong) 160 * M);
1890
1891 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1892
1893 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1894 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1895 return JNI_EINVAL;
1896 }
1897 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1898 return JNI_EINVAL;
1899 }
1900 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1901 return JNI_EINVAL;
1902 }
1903 }
1904 if (FLAG_IS_DEFAULT(NewSize)) {
1905 // Make the young generation 3/8ths of the total heap.
1906 if (FLAG_SET_CMDLINE(NewSize,
1907 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1908 return JNI_EINVAL;
1909 }
1910 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1911 return JNI_EINVAL;
1912 }
1913 }
1914
1915 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1916 FLAG_SET_DEFAULT(UseLargePages, true);
1917 #endif
1918
1919 // Increase some data structure sizes for efficiency
1920 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1921 return JNI_EINVAL;
1922 }
1923 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1924 return JNI_EINVAL;
1925 }
1926 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1927 return JNI_EINVAL;
1928 }
1929
1930 // See the OldPLABSize comment below, but replace 'after promotion'
1931 // with 'after copying'. YoungPLABSize is the size of the survivor
1932 // space per-gc-thread buffers. The default is 4kw.
1933 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1934 return JNI_EINVAL;
1935 }
1936
1937 // OldPLABSize is the size of the buffers in the old gen that
1938 // UseParallelGC uses to promote live data that doesn't fit in the
1939 // survivor spaces. At any given time, there's one for each gc thread.
1940 // The default size is 1kw. These buffers are rarely used, since the
1941 // survivor spaces are usually big enough. For specjbb, however, there
1942 // are occasions when there's lots of live data in the young gen
1943 // and we end up promoting some of it. We don't have a definite
1944 // explanation for why bumping OldPLABSize helps, but the theory
1945 // is that a bigger PLAB results in retaining something like the
1946 // original allocation order after promotion, which improves mutator
1947 // locality. A minor effect may be that larger PLABs reduce the
1948 // number of PLAB allocation events during gc. The value of 8kw
1949 // was arrived at by experimenting with specjbb.
1950 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1951 return JNI_EINVAL;
1952 }
1953
1954 // Enable parallel GC and adaptive generation sizing
1955 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1956 return JNI_EINVAL;
1957 }
1958
1959 // Encourage steady state memory management
1960 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1961 return JNI_EINVAL;
1962 }
1963
1964 // This appears to improve mutator locality
1965 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1966 return JNI_EINVAL;
1967 }
1968
1969 return JNI_OK;
1970 }
1971
1972 // This must be called after ergonomics.
1973 void Arguments::set_bytecode_flags() {
1974 if (!RewriteBytecodes) {
1975 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1976 }
1977 }
1978
1979 // Aggressive optimization flags
1980 jint Arguments::set_aggressive_opts_flags() {
1981 #ifdef COMPILER2
1982 if (AggressiveUnboxing) {
1983 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1984 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1985 } else if (!EliminateAutoBox) {
1986 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1987 AggressiveUnboxing = false;
1988 }
1989 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1990 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1991 } else if (!DoEscapeAnalysis) {
1992 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1993 AggressiveUnboxing = false;
1994 }
1995 }
1996 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1997 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1998 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1999 }
2000 // Feed the cache size setting into the JDK
2001 char buffer[1024];
2002 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2003 if (!add_property(buffer)) {
2004 return JNI_ENOMEM;
2005 }
2006 }
2007 #endif
2008
2009 return JNI_OK;
2010 }
2011
2012 //===========================================================================================================
2013 // Parsing of java.compiler property
2014
2015 void Arguments::process_java_compiler_argument(const char* arg) {
2016 // For backwards compatibility, Djava.compiler=NONE or ""
2017 // causes us to switch to -Xint mode UNLESS -Xdebug
2018 // is also specified.
2019 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2020 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2021 }
2022 }
2023
2024 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2025 _sun_java_launcher = os::strdup_check_oom(launcher);
2026 }
2027
2028 bool Arguments::created_by_java_launcher() {
2029 assert(_sun_java_launcher != NULL, "property must have value");
2030 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2031 }
2032
2033 bool Arguments::sun_java_launcher_is_altjvm() {
2034 return _sun_java_launcher_is_altjvm;
2035 }
2036
2037 //===========================================================================================================
2038 // Parsing of main arguments
2039
2040 unsigned int addreads_count = 0;
2041 unsigned int addexports_count = 0;
2042 unsigned int addopens_count = 0;
2043 unsigned int addmods_count = 0;
2044 unsigned int patch_mod_count = 0;
2045
2046 // Check the consistency of vm_init_args
2047 bool Arguments::check_vm_args_consistency() {
2048 // Method for adding checks for flag consistency.
2049 // The intent is to warn the user of all possible conflicts,
2050 // before returning an error.
2051 // Note: Needs platform-dependent factoring.
2052 bool status = true;
2053
2054 if (TLABRefillWasteFraction == 0) {
2055 jio_fprintf(defaultStream::error_stream(),
2056 "TLABRefillWasteFraction should be a denominator, "
2057 "not " SIZE_FORMAT "\n",
2058 TLABRefillWasteFraction);
2059 status = false;
2060 }
2061
2062 if (PrintNMTStatistics) {
2063 #if INCLUDE_NMT
2064 if (MemTracker::tracking_level() == NMT_off) {
2065 #endif // INCLUDE_NMT
2066 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2067 PrintNMTStatistics = false;
2068 #if INCLUDE_NMT
2069 }
2070 #endif
2071 }
2072
2073 status = CompilerConfig::check_args_consistency(status);
2074 #if INCLUDE_JVMCI
2075 if (status && EnableJVMCI) {
2076 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2077 AddProperty, UnwriteableProperty, InternalProperty);
2078 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2079 return false;
2080 }
2081 }
2082 #endif
2083
2084 #ifndef SUPPORT_RESERVED_STACK_AREA
2085 if (StackReservedPages != 0) {
2086 FLAG_SET_CMDLINE(StackReservedPages, 0);
2087 warning("Reserved Stack Area not supported on this platform");
2088 }
2089 #endif
2090
2091 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2092 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2093 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2094 }
2095 }
2096
2097 status = status && GCArguments::check_args_consistency();
2098
2099 return status;
2100 }
2101
2102 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2103 const char* option_type) {
2104 if (ignore) return false;
2105
2106 const char* spacer = " ";
2107 if (option_type == NULL) {
2108 option_type = ++spacer; // Set both to the empty string.
2109 }
2110
2111 jio_fprintf(defaultStream::error_stream(),
2112 "Unrecognized %s%soption: %s\n", option_type, spacer,
2113 option->optionString);
2114 return true;
2115 }
2116
2117 static const char* user_assertion_options[] = {
2118 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2119 };
2120
2121 static const char* system_assertion_options[] = {
2122 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2123 };
2124
2125 bool Arguments::parse_uintx(const char* value,
2126 uintx* uintx_arg,
2127 uintx min_size) {
2128
2129 // Check the sign first since atojulong() parses only unsigned values.
2130 bool value_is_positive = !(*value == '-');
2131
2132 if (value_is_positive) {
2133 julong n;
2134 bool good_return = atojulong(value, &n);
2135 if (good_return) {
2136 bool above_minimum = n >= min_size;
2137 bool value_is_too_large = n > max_uintx;
2138
2139 if (above_minimum && !value_is_too_large) {
2140 *uintx_arg = n;
2141 return true;
2142 }
2143 }
2144 }
2145 return false;
2146 }
2147
2148 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2149 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2150 char* property = AllocateHeap(prop_len, mtArguments);
2151 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2152 if (ret < 0 || ret >= (int)prop_len) {
2153 FreeHeap(property);
2154 return false;
2155 }
2156 bool added = add_property(property, UnwriteableProperty, internal);
2157 FreeHeap(property);
2158 return added;
2159 }
2160
2161 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2162 const unsigned int props_count_limit = 1000;
2163 const int max_digits = 3;
2164 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2165
2166 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2167 if (count < props_count_limit) {
2168 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2169 char* property = AllocateHeap(prop_len, mtArguments);
2170 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2171 if (ret < 0 || ret >= (int)prop_len) {
2172 FreeHeap(property);
2173 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2174 return false;
2175 }
2176 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2177 FreeHeap(property);
2178 return added;
2179 }
2180
2181 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2182 return false;
2183 }
2184
2185 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2186 julong* long_arg,
2187 julong min_size,
2188 julong max_size) {
2189 if (!atojulong(s, long_arg)) return arg_unreadable;
2190 return check_memory_size(*long_arg, min_size, max_size);
2191 }
2192
2193 // Parse JavaVMInitArgs structure
2194
2195 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2196 const JavaVMInitArgs *java_options_args,
2197 const JavaVMInitArgs *cmd_line_args) {
2198 bool patch_mod_javabase = false;
2199
2200 // Save default settings for some mode flags
2201 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2202 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2203 Arguments::_ClipInlining = ClipInlining;
2204 Arguments::_BackgroundCompilation = BackgroundCompilation;
2205 if (TieredCompilation) {
2206 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2207 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2208 }
2209
2210 // Setup flags for mixed which is the default
2211 set_mode_flags(_mixed);
2212
2213 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2214 // variable (if present).
2215 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2216 if (result != JNI_OK) {
2217 return result;
2218 }
2219
2220 // Parse args structure generated from the command line flags.
2221 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2222 if (result != JNI_OK) {
2223 return result;
2224 }
2225
2226 // Parse args structure generated from the _JAVA_OPTIONS environment
2227 // variable (if present) (mimics classic VM)
2228 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2229 if (result != JNI_OK) {
2230 return result;
2231 }
2232
2233 // We need to ensure processor and memory resources have been properly
2234 // configured - which may rely on arguments we just processed - before
2235 // doing the final argument processing. Any argument processing that
2236 // needs to know about processor and memory resources must occur after
2237 // this point.
2238
2239 os::init_container_support();
2240
2241 // Do final processing now that all arguments have been parsed
2242 result = finalize_vm_init_args(patch_mod_javabase);
2243 if (result != JNI_OK) {
2244 return result;
2245 }
2246
2247 return JNI_OK;
2248 }
2249
2250 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2251 // represents a valid JDWP agent. is_path==true denotes that we
2252 // are dealing with -agentpath (case where name is a path), otherwise with
2253 // -agentlib
2254 bool valid_jdwp_agent(char *name, bool is_path) {
2255 char *_name;
2256 const char *_jdwp = "jdwp";
2257 size_t _len_jdwp, _len_prefix;
2258
2259 if (is_path) {
2260 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2261 return false;
2262 }
2263
2264 _name++; // skip past last path separator
2265 _len_prefix = strlen(JNI_LIB_PREFIX);
2266
2267 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2268 return false;
2269 }
2270
2271 _name += _len_prefix;
2272 _len_jdwp = strlen(_jdwp);
2273
2274 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2275 _name += _len_jdwp;
2276 }
2277 else {
2278 return false;
2279 }
2280
2281 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2282 return false;
2283 }
2284
2285 return true;
2286 }
2287
2288 if (strcmp(name, _jdwp) == 0) {
2289 return true;
2290 }
2291
2292 return false;
2293 }
2294
2295 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2296 // --patch-module=<module>=<file>(<pathsep><file>)*
2297 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2298 // Find the equal sign between the module name and the path specification
2299 const char* module_equal = strchr(patch_mod_tail, '=');
2300 if (module_equal == NULL) {
2301 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2302 return JNI_ERR;
2303 } else {
2304 // Pick out the module name
2305 size_t module_len = module_equal - patch_mod_tail;
2306 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2307 if (module_name != NULL) {
2308 memcpy(module_name, patch_mod_tail, module_len);
2309 *(module_name + module_len) = '\0';
2310 // The path piece begins one past the module_equal sign
2311 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2312 FREE_C_HEAP_ARRAY(char, module_name);
2313 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2314 return JNI_ENOMEM;
2315 }
2316 } else {
2317 return JNI_ENOMEM;
2318 }
2319 }
2320 return JNI_OK;
2321 }
2322
2323 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2324 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2325 // The min and max sizes match the values in globals.hpp, but scaled
2326 // with K. The values have been chosen so that alignment with page
2327 // size doesn't change the max value, which makes the conversions
2328 // back and forth between Xss value and ThreadStackSize value easier.
2329 // The values have also been chosen to fit inside a 32-bit signed type.
2330 const julong min_ThreadStackSize = 0;
2331 const julong max_ThreadStackSize = 1 * M;
2332
2333 const julong min_size = min_ThreadStackSize * K;
2334 const julong max_size = max_ThreadStackSize * K;
2335
2336 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2337
2338 julong size = 0;
2339 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2340 if (errcode != arg_in_range) {
2341 bool silent = (option == NULL); // Allow testing to silence error messages
2342 if (!silent) {
2343 jio_fprintf(defaultStream::error_stream(),
2344 "Invalid thread stack size: %s\n", option->optionString);
2345 describe_range_error(errcode);
2346 }
2347 return JNI_EINVAL;
2348 }
2349
2350 // Internally track ThreadStackSize in units of 1024 bytes.
2351 const julong size_aligned = align_up(size, K);
2352 assert(size <= size_aligned,
2353 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2354 size, size_aligned);
2355
2356 const julong size_in_K = size_aligned / K;
2357 assert(size_in_K < (julong)max_intx,
2358 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2359 size_in_K);
2360
2361 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2362 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2363 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2364 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2365 max_expanded, size_in_K);
2366
2367 *out_ThreadStackSize = (intx)size_in_K;
2368
2369 return JNI_OK;
2370 }
2371
2372 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2373 // For match_option to return remaining or value part of option string
2374 const char* tail;
2375
2376 // iterate over arguments
2377 for (int index = 0; index < args->nOptions; index++) {
2378 bool is_absolute_path = false; // for -agentpath vs -agentlib
2379
2380 const JavaVMOption* option = args->options + index;
2381
2382 if (!match_option(option, "-Djava.class.path", &tail) &&
2383 !match_option(option, "-Dsun.java.command", &tail) &&
2384 !match_option(option, "-Dsun.java.launcher", &tail)) {
2385
2386 // add all jvm options to the jvm_args string. This string
2387 // is used later to set the java.vm.args PerfData string constant.
2388 // the -Djava.class.path and the -Dsun.java.command options are
2389 // omitted from jvm_args string as each have their own PerfData
2390 // string constant object.
2391 build_jvm_args(option->optionString);
2392 }
2393
2394 // -verbose:[class/module/gc/jni]
2395 if (match_option(option, "-verbose", &tail)) {
2396 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2397 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2398 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2399 } else if (!strcmp(tail, ":module")) {
2400 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2401 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2402 } else if (!strcmp(tail, ":gc")) {
2403 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2404 } else if (!strcmp(tail, ":jni")) {
2405 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2406 return JNI_EINVAL;
2407 }
2408 }
2409 // -da / -ea / -disableassertions / -enableassertions
2410 // These accept an optional class/package name separated by a colon, e.g.,
2411 // -da:java.lang.Thread.
2412 } else if (match_option(option, user_assertion_options, &tail, true)) {
2413 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2414 if (*tail == '\0') {
2415 JavaAssertions::setUserClassDefault(enable);
2416 } else {
2417 assert(*tail == ':', "bogus match by match_option()");
2418 JavaAssertions::addOption(tail + 1, enable);
2419 }
2420 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2421 } else if (match_option(option, system_assertion_options, &tail, false)) {
2422 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2423 JavaAssertions::setSystemClassDefault(enable);
2424 // -bootclasspath:
2425 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2426 jio_fprintf(defaultStream::output_stream(),
2427 "-Xbootclasspath is no longer a supported option.\n");
2428 return JNI_EINVAL;
2429 // -bootclasspath/a:
2430 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2431 Arguments::append_sysclasspath(tail);
2432 // -bootclasspath/p:
2433 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2434 jio_fprintf(defaultStream::output_stream(),
2435 "-Xbootclasspath/p is no longer a supported option.\n");
2436 return JNI_EINVAL;
2437 // -Xrun
2438 } else if (match_option(option, "-Xrun", &tail)) {
2439 if (tail != NULL) {
2440 const char* pos = strchr(tail, ':');
2441 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2442 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2443 jio_snprintf(name, len + 1, "%s", tail);
2444
2445 char *options = NULL;
2446 if(pos != NULL) {
2447 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2448 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2449 }
2450 #if !INCLUDE_JVMTI
2451 if (strcmp(name, "jdwp") == 0) {
2452 jio_fprintf(defaultStream::error_stream(),
2453 "Debugging agents are not supported in this VM\n");
2454 return JNI_ERR;
2455 }
2456 #endif // !INCLUDE_JVMTI
2457 add_init_library(name, options);
2458 }
2459 } else if (match_option(option, "--add-reads=", &tail)) {
2460 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2461 return JNI_ENOMEM;
2462 }
2463 } else if (match_option(option, "--add-exports=", &tail)) {
2464 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2465 return JNI_ENOMEM;
2466 }
2467 } else if (match_option(option, "--add-opens=", &tail)) {
2468 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2469 return JNI_ENOMEM;
2470 }
2471 } else if (match_option(option, "--add-modules=", &tail)) {
2472 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2473 return JNI_ENOMEM;
2474 }
2475 } else if (match_option(option, "--limit-modules=", &tail)) {
2476 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2477 return JNI_ENOMEM;
2478 }
2479 } else if (match_option(option, "--module-path=", &tail)) {
2480 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2481 return JNI_ENOMEM;
2482 }
2483 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2484 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2485 return JNI_ENOMEM;
2486 }
2487 } else if (match_option(option, "--patch-module=", &tail)) {
2488 // --patch-module=<module>=<file>(<pathsep><file>)*
2489 int res = process_patch_mod_option(tail, patch_mod_javabase);
2490 if (res != JNI_OK) {
2491 return res;
2492 }
2493 } else if (match_option(option, "--illegal-access=", &tail)) {
2494 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2495 return JNI_ENOMEM;
2496 }
2497 // -agentlib and -agentpath
2498 } else if (match_option(option, "-agentlib:", &tail) ||
2499 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2500 if(tail != NULL) {
2501 const char* pos = strchr(tail, '=');
2502 char* name;
2503 if (pos == NULL) {
2504 name = os::strdup_check_oom(tail, mtArguments);
2505 } else {
2506 size_t len = pos - tail;
2507 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2508 memcpy(name, tail, len);
2509 name[len] = '\0';
2510 }
2511
2512 char *options = NULL;
2513 if(pos != NULL) {
2514 options = os::strdup_check_oom(pos + 1, mtArguments);
2515 }
2516 #if !INCLUDE_JVMTI
2517 if (valid_jdwp_agent(name, is_absolute_path)) {
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Debugging agents are not supported in this VM\n");
2520 return JNI_ERR;
2521 }
2522 #endif // !INCLUDE_JVMTI
2523 add_init_agent(name, options, is_absolute_path);
2524 }
2525 // -javaagent
2526 } else if (match_option(option, "-javaagent:", &tail)) {
2527 #if !INCLUDE_JVMTI
2528 jio_fprintf(defaultStream::error_stream(),
2529 "Instrumentation agents are not supported in this VM\n");
2530 return JNI_ERR;
2531 #else
2532 if (tail != NULL) {
2533 size_t length = strlen(tail) + 1;
2534 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2535 jio_snprintf(options, length, "%s", tail);
2536 add_instrument_agent("instrument", options, false);
2537 // java agents need module java.instrument
2538 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2539 return JNI_ENOMEM;
2540 }
2541 }
2542 #endif // !INCLUDE_JVMTI
2543 // --enable_preview
2544 } else if (match_option(option, "--enable-preview")) {
2545 set_enable_preview();
2546 // -Xnoclassgc
2547 } else if (match_option(option, "-Xnoclassgc")) {
2548 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2549 return JNI_EINVAL;
2550 }
2551 // -Xconcgc
2552 } else if (match_option(option, "-Xconcgc")) {
2553 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2554 return JNI_EINVAL;
2555 }
2556 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2557 // -Xnoconcgc
2558 } else if (match_option(option, "-Xnoconcgc")) {
2559 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2560 return JNI_EINVAL;
2561 }
2562 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2563 // -Xbatch
2564 } else if (match_option(option, "-Xbatch")) {
2565 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 // -Xmn for compatibility with other JVM vendors
2569 } else if (match_option(option, "-Xmn", &tail)) {
2570 julong long_initial_young_size = 0;
2571 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2572 if (errcode != arg_in_range) {
2573 jio_fprintf(defaultStream::error_stream(),
2574 "Invalid initial young generation size: %s\n", option->optionString);
2575 describe_range_error(errcode);
2576 return JNI_EINVAL;
2577 }
2578 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2579 return JNI_EINVAL;
2580 }
2581 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2582 return JNI_EINVAL;
2583 }
2584 // -Xms
2585 } else if (match_option(option, "-Xms", &tail)) {
2586 julong size = 0;
2587 // an initial heap size of 0 means automatically determine
2588 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2589 if (errcode != arg_in_range) {
2590 jio_fprintf(defaultStream::error_stream(),
2591 "Invalid initial heap size: %s\n", option->optionString);
2592 describe_range_error(errcode);
2593 return JNI_EINVAL;
2594 }
2595 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2599 return JNI_EINVAL;
2600 }
2601 // -Xmx
2602 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2603 julong long_max_heap_size = 0;
2604 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2605 if (errcode != arg_in_range) {
2606 jio_fprintf(defaultStream::error_stream(),
2607 "Invalid maximum heap size: %s\n", option->optionString);
2608 describe_range_error(errcode);
2609 return JNI_EINVAL;
2610 }
2611 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2612 return JNI_EINVAL;
2613 }
2614 // Xmaxf
2615 } else if (match_option(option, "-Xmaxf", &tail)) {
2616 char* err;
2617 int maxf = (int)(strtod(tail, &err) * 100);
2618 if (*err != '\0' || *tail == '\0') {
2619 jio_fprintf(defaultStream::error_stream(),
2620 "Bad max heap free percentage size: %s\n",
2621 option->optionString);
2622 return JNI_EINVAL;
2623 } else {
2624 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2625 return JNI_EINVAL;
2626 }
2627 }
2628 // Xminf
2629 } else if (match_option(option, "-Xminf", &tail)) {
2630 char* err;
2631 int minf = (int)(strtod(tail, &err) * 100);
2632 if (*err != '\0' || *tail == '\0') {
2633 jio_fprintf(defaultStream::error_stream(),
2634 "Bad min heap free percentage size: %s\n",
2635 option->optionString);
2636 return JNI_EINVAL;
2637 } else {
2638 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2639 return JNI_EINVAL;
2640 }
2641 }
2642 // -Xss
2643 } else if (match_option(option, "-Xss", &tail)) {
2644 intx value = 0;
2645 jint err = parse_xss(option, tail, &value);
2646 if (err != JNI_OK) {
2647 return err;
2648 }
2649 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2653 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2654 julong long_ReservedCodeCacheSize = 0;
2655
2656 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2657 if (errcode != arg_in_range) {
2658 jio_fprintf(defaultStream::error_stream(),
2659 "Invalid maximum code cache size: %s.\n", option->optionString);
2660 return JNI_EINVAL;
2661 }
2662 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 // -green
2666 } else if (match_option(option, "-green")) {
2667 jio_fprintf(defaultStream::error_stream(),
2668 "Green threads support not available\n");
2669 return JNI_EINVAL;
2670 // -native
2671 } else if (match_option(option, "-native")) {
2672 // HotSpot always uses native threads, ignore silently for compatibility
2673 // -Xrs
2674 } else if (match_option(option, "-Xrs")) {
2675 // Classic/EVM option, new functionality
2676 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 // -Xprof
2680 } else if (match_option(option, "-Xprof")) {
2681 char version[256];
2682 // Obsolete in JDK 10
2683 JDK_Version::jdk(10).to_string(version, sizeof(version));
2684 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2685 // -Xinternalversion
2686 } else if (match_option(option, "-Xinternalversion")) {
2687 jio_fprintf(defaultStream::output_stream(), "%s\n",
2688 VM_Version::internal_vm_info_string());
2689 vm_exit(0);
2690 #ifndef PRODUCT
2691 // -Xprintflags
2692 } else if (match_option(option, "-Xprintflags")) {
2693 JVMFlag::printFlags(tty, false);
2694 vm_exit(0);
2695 #endif
2696 // -D
2697 } else if (match_option(option, "-D", &tail)) {
2698 const char* value;
2699 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2700 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2701 // abort if -Djava.endorsed.dirs is set
2702 jio_fprintf(defaultStream::output_stream(),
2703 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2704 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2705 return JNI_EINVAL;
2706 }
2707 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2708 *value != '\0' && strcmp(value, "\"\"") != 0) {
2709 // abort if -Djava.ext.dirs is set
2710 jio_fprintf(defaultStream::output_stream(),
2711 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2712 return JNI_EINVAL;
2713 }
2714 // Check for module related properties. They must be set using the modules
2715 // options. For example: use "--add-modules=java.sql", not
2716 // "-Djdk.module.addmods=java.sql"
2717 if (is_internal_module_property(option->optionString + 2)) {
2718 needs_module_property_warning = true;
2719 continue;
2720 }
2721
2722 if (!add_property(tail)) {
2723 return JNI_ENOMEM;
2724 }
2725 // Out of the box management support
2726 if (match_option(option, "-Dcom.sun.management", &tail)) {
2727 #if INCLUDE_MANAGEMENT
2728 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 // management agent in module jdk.management.agent
2732 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2733 return JNI_ENOMEM;
2734 }
2735 #else
2736 jio_fprintf(defaultStream::output_stream(),
2737 "-Dcom.sun.management is not supported in this VM.\n");
2738 return JNI_ERR;
2739 #endif
2740 }
2741 // -Xint
2742 } else if (match_option(option, "-Xint")) {
2743 set_mode_flags(_int);
2744 // -Xmixed
2745 } else if (match_option(option, "-Xmixed")) {
2746 set_mode_flags(_mixed);
2747 // -Xcomp
2748 } else if (match_option(option, "-Xcomp")) {
2749 // for testing the compiler; turn off all flags that inhibit compilation
2750 set_mode_flags(_comp);
2751 // -Xshare:dump
2752 } else if (match_option(option, "-Xshare:dump")) {
2753 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 // -Xshare:on
2757 } else if (match_option(option, "-Xshare:on")) {
2758 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2765 } else if (match_option(option, "-Xshare:auto")) {
2766 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2770 return JNI_EINVAL;
2771 }
2772 // -Xshare:off
2773 } else if (match_option(option, "-Xshare:off")) {
2774 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 // -Xverify
2781 } else if (match_option(option, "-Xverify", &tail)) {
2782 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2783 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != 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, ":remote") == 0) {
2790 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2794 return JNI_EINVAL;
2795 }
2796 } else if (strcmp(tail, ":none") == 0) {
2797 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2804 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2805 return JNI_EINVAL;
2806 }
2807 // -Xdebug
2808 } else if (match_option(option, "-Xdebug")) {
2809 // note this flag has been used, then ignore
2810 set_xdebug_mode(true);
2811 // -Xnoagent
2812 } else if (match_option(option, "-Xnoagent")) {
2813 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2814 } else if (match_option(option, "-Xloggc:", &tail)) {
2815 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2816 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2817 _gc_log_filename = os::strdup_check_oom(tail);
2818 } else if (match_option(option, "-Xlog", &tail)) {
2819 bool ret = false;
2820 if (strcmp(tail, ":help") == 0) {
2821 fileStream stream(defaultStream::output_stream());
2822 LogConfiguration::print_command_line_help(&stream);
2823 vm_exit(0);
2824 } else if (strcmp(tail, ":disable") == 0) {
2825 LogConfiguration::disable_logging();
2826 ret = true;
2827 } else if (*tail == '\0') {
2828 ret = LogConfiguration::parse_command_line_arguments();
2829 assert(ret, "-Xlog without arguments should never fail to parse");
2830 } else if (*tail == ':') {
2831 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2832 }
2833 if (ret == false) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2836 tail);
2837 return JNI_EINVAL;
2838 }
2839 // JNI hooks
2840 } else if (match_option(option, "-Xcheck", &tail)) {
2841 if (!strcmp(tail, ":jni")) {
2842 #if !INCLUDE_JNI_CHECK
2843 warning("JNI CHECKING is not supported in this VM");
2844 #else
2845 CheckJNICalls = true;
2846 #endif // INCLUDE_JNI_CHECK
2847 } else if (is_bad_option(option, args->ignoreUnrecognized,
2848 "check")) {
2849 return JNI_EINVAL;
2850 }
2851 } else if (match_option(option, "vfprintf")) {
2852 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2853 } else if (match_option(option, "exit")) {
2854 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2855 } else if (match_option(option, "abort")) {
2856 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2857 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2858 // and the last option wins.
2859 } else if (match_option(option, "-XX:+NeverTenure")) {
2860 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2870 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2871 return JNI_EINVAL;
2872 }
2873 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2874 return JNI_EINVAL;
2875 }
2876 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2877 return JNI_EINVAL;
2878 }
2879 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2880 uintx max_tenuring_thresh = 0;
2881 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2882 jio_fprintf(defaultStream::error_stream(),
2883 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2884 return JNI_EINVAL;
2885 }
2886
2887 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890
2891 if (MaxTenuringThreshold == 0) {
2892 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898 } else {
2899 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2903 return JNI_EINVAL;
2904 }
2905 }
2906 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2907 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2914 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2921 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2922 return JNI_EINVAL;
2923 }
2924 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2928 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2935 #if defined(DTRACE_ENABLED)
2936 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 #else // defined(DTRACE_ENABLED)
2949 jio_fprintf(defaultStream::error_stream(),
2950 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2951 return JNI_EINVAL;
2952 #endif // defined(DTRACE_ENABLED)
2953 #ifdef ASSERT
2954 } else if (match_option(option, "-XX:+FullGCALot")) {
2955 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 // disable scavenge before parallel mark-compact
2959 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 #endif
2963 #if !INCLUDE_MANAGEMENT
2964 } else if (match_option(option, "-XX:+ManagementServer")) {
2965 jio_fprintf(defaultStream::error_stream(),
2966 "ManagementServer is not supported in this VM.\n");
2967 return JNI_ERR;
2968 #endif // INCLUDE_MANAGEMENT
2969 #if INCLUDE_JFR
2970 } else if (match_jfr_option(&option)) {
2971 return JNI_EINVAL;
2972 #endif
2973 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2974 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2975 // already been handled
2976 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2977 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2978 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2979 return JNI_EINVAL;
2980 }
2981 }
2982 // Unknown option
2983 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2984 return JNI_ERR;
2985 }
2986 }
2987
2988 // PrintSharedArchiveAndExit will turn on
2989 // -Xshare:on
2990 // -Xlog:class+path=info
2991 if (PrintSharedArchiveAndExit) {
2992 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2993 return JNI_EINVAL;
2994 }
2995 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2996 return JNI_EINVAL;
2997 }
2998 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2999 }
3000
3001 fix_appclasspath();
3002
3003 return JNI_OK;
3004 }
3005
3006 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3007 // For java.base check for duplicate --patch-module options being specified on the command line.
3008 // This check is only required for java.base, all other duplicate module specifications
3009 // will be checked during module system initialization. The module system initialization
3010 // will throw an ExceptionInInitializerError if this situation occurs.
3011 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3012 if (*patch_mod_javabase) {
3013 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3014 } else {
3015 *patch_mod_javabase = true;
3016 }
3017 }
3018
3019 // Create GrowableArray lazily, only if --patch-module has been specified
3020 if (_patch_mod_prefix == NULL) {
3021 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3022 }
3023
3024 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3025 }
3026
3027 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3028 //
3029 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3030 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3031 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3032 // path is treated as the current directory.
3033 //
3034 // This causes problems with CDS, which requires that all directories specified in the classpath
3035 // must be empty. In most cases, applications do NOT want to load classes from the current
3036 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3037 // scripts compatible with CDS.
3038 void Arguments::fix_appclasspath() {
3039 if (IgnoreEmptyClassPaths) {
3040 const char separator = *os::path_separator();
3041 const char* src = _java_class_path->value();
3042
3043 // skip over all the leading empty paths
3044 while (*src == separator) {
3045 src ++;
3046 }
3047
3048 char* copy = os::strdup_check_oom(src, mtArguments);
3049
3050 // trim all trailing empty paths
3051 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3052 *tail = '\0';
3053 }
3054
3055 char from[3] = {separator, separator, '\0'};
3056 char to [2] = {separator, '\0'};
3057 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3058 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3059 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3060 }
3061
3062 _java_class_path->set_writeable_value(copy);
3063 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3064 }
3065 }
3066
3067 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3068 // check if the default lib/endorsed directory exists; if so, error
3069 char path[JVM_MAXPATHLEN];
3070 const char* fileSep = os::file_separator();
3071 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3072
3073 DIR* dir = os::opendir(path);
3074 if (dir != NULL) {
3075 jio_fprintf(defaultStream::output_stream(),
3076 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3077 "in modular form will be supported via the concept of upgradeable modules.\n");
3078 os::closedir(dir);
3079 return JNI_ERR;
3080 }
3081
3082 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3083 dir = os::opendir(path);
3084 if (dir != NULL) {
3085 jio_fprintf(defaultStream::output_stream(),
3086 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3087 "Use -classpath instead.\n.");
3088 os::closedir(dir);
3089 return JNI_ERR;
3090 }
3091
3092 // This must be done after all arguments have been processed
3093 // and the container support has been initialized since AggressiveHeap
3094 // relies on the amount of total memory available.
3095 if (AggressiveHeap) {
3096 jint result = set_aggressive_heap_flags();
3097 if (result != JNI_OK) {
3098 return result;
3099 }
3100 }
3101
3102 // This must be done after all arguments have been processed.
3103 // java_compiler() true means set to "NONE" or empty.
3104 if (java_compiler() && !xdebug_mode()) {
3105 // For backwards compatibility, we switch to interpreted mode if
3106 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3107 // not specified.
3108 set_mode_flags(_int);
3109 }
3110
3111 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3112 // but like -Xint, leave compilation thresholds unaffected.
3113 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3114 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3115 set_mode_flags(_int);
3116 }
3117
3118 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3119 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3120 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3121 }
3122
3123 #if !COMPILER2_OR_JVMCI
3124 // Don't degrade server performance for footprint
3125 if (FLAG_IS_DEFAULT(UseLargePages) &&
3126 MaxHeapSize < LargePageHeapSizeThreshold) {
3127 // No need for large granularity pages w/small heaps.
3128 // Note that large pages are enabled/disabled for both the
3129 // Java heap and the code cache.
3130 FLAG_SET_DEFAULT(UseLargePages, false);
3131 }
3132
3133 UNSUPPORTED_OPTION(ProfileInterpreter);
3134 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3135 #endif
3136
3137 #ifndef TIERED
3138 // Tiered compilation is undefined.
3139 UNSUPPORTED_OPTION(TieredCompilation);
3140 #endif
3141
3142 if (!check_vm_args_consistency()) {
3143 return JNI_ERR;
3144 }
3145
3146 #if INCLUDE_CDS
3147 if (DumpSharedSpaces) {
3148 // Disable biased locking now as it interferes with the clean up of
3149 // the archived Klasses and Java string objects (at dump time only).
3150 UseBiasedLocking = false;
3151
3152 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3153 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3154 // compiler just to be safe.
3155 //
3156 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3157 // instead of modifying them in place. The copy is inaccessible to the compiler.
3158 // TODO: revisit the following for the static archive case.
3159 set_mode_flags(_int);
3160 }
3161 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3162 // Always verify non-system classes during CDS dump
3163 if (!BytecodeVerificationRemote) {
3164 BytecodeVerificationRemote = true;
3165 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3166 }
3167 }
3168 if (ArchiveClassesAtExit == NULL) {
3169 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3170 }
3171 if (UseSharedSpaces && patch_mod_javabase) {
3172 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3173 }
3174 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3175 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3176 }
3177 #endif
3178
3179 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3180 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3181 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3182
3183 return JNI_OK;
3184 }
3185
3186 // Helper class for controlling the lifetime of JavaVMInitArgs
3187 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3188 // deleted on the destruction of the ScopedVMInitArgs object.
3189 class ScopedVMInitArgs : public StackObj {
3190 private:
3191 JavaVMInitArgs _args;
3192 char* _container_name;
3193 bool _is_set;
3194 char* _vm_options_file_arg;
3195
3196 public:
3197 ScopedVMInitArgs(const char *container_name) {
3198 _args.version = JNI_VERSION_1_2;
3199 _args.nOptions = 0;
3200 _args.options = NULL;
3201 _args.ignoreUnrecognized = false;
3202 _container_name = (char *)container_name;
3203 _is_set = false;
3204 _vm_options_file_arg = NULL;
3205 }
3206
3207 // Populates the JavaVMInitArgs object represented by this
3208 // ScopedVMInitArgs object with the arguments in options. The
3209 // allocated memory is deleted by the destructor. If this method
3210 // returns anything other than JNI_OK, then this object is in a
3211 // partially constructed state, and should be abandoned.
3212 jint set_args(GrowableArray<JavaVMOption>* options) {
3213 _is_set = true;
3214 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3215 JavaVMOption, options->length(), mtArguments);
3216 if (options_arr == NULL) {
3217 return JNI_ENOMEM;
3218 }
3219 _args.options = options_arr;
3220
3221 for (int i = 0; i < options->length(); i++) {
3222 options_arr[i] = options->at(i);
3223 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3224 if (options_arr[i].optionString == NULL) {
3225 // Rely on the destructor to do cleanup.
3226 _args.nOptions = i;
3227 return JNI_ENOMEM;
3228 }
3229 }
3230
3231 _args.nOptions = options->length();
3232 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3233 return JNI_OK;
3234 }
3235
3236 JavaVMInitArgs* get() { return &_args; }
3237 char* container_name() { return _container_name; }
3238 bool is_set() { return _is_set; }
3239 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3240 char* vm_options_file_arg() { return _vm_options_file_arg; }
3241
3242 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3243 if (_vm_options_file_arg != NULL) {
3244 os::free(_vm_options_file_arg);
3245 }
3246 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3247 }
3248
3249 ~ScopedVMInitArgs() {
3250 if (_vm_options_file_arg != NULL) {
3251 os::free(_vm_options_file_arg);
3252 }
3253 if (_args.options == NULL) return;
3254 for (int i = 0; i < _args.nOptions; i++) {
3255 os::free(_args.options[i].optionString);
3256 }
3257 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3258 }
3259
3260 // Insert options into this option list, to replace option at
3261 // vm_options_file_pos (-XX:VMOptionsFile)
3262 jint insert(const JavaVMInitArgs* args,
3263 const JavaVMInitArgs* args_to_insert,
3264 const int vm_options_file_pos) {
3265 assert(_args.options == NULL, "shouldn't be set yet");
3266 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3267 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3268
3269 int length = args->nOptions + args_to_insert->nOptions - 1;
3270 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3271 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3272 for (int i = 0; i < args->nOptions; i++) {
3273 if (i == vm_options_file_pos) {
3274 // insert the new options starting at the same place as the
3275 // -XX:VMOptionsFile option
3276 for (int j = 0; j < args_to_insert->nOptions; j++) {
3277 options->push(args_to_insert->options[j]);
3278 }
3279 } else {
3280 options->push(args->options[i]);
3281 }
3282 }
3283 // make into options array
3284 jint result = set_args(options);
3285 delete options;
3286 return result;
3287 }
3288 };
3289
3290 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3291 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3292 }
3293
3294 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3295 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3296 }
3297
3298 jint Arguments::parse_options_environment_variable(const char* name,
3299 ScopedVMInitArgs* vm_args) {
3300 char *buffer = ::getenv(name);
3301
3302 // Don't check this environment variable if user has special privileges
3303 // (e.g. unix su command).
3304 if (buffer == NULL || os::have_special_privileges()) {
3305 return JNI_OK;
3306 }
3307
3308 if ((buffer = os::strdup(buffer)) == NULL) {
3309 return JNI_ENOMEM;
3310 }
3311
3312 jio_fprintf(defaultStream::error_stream(),
3313 "Picked up %s: %s\n", name, buffer);
3314
3315 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3316
3317 os::free(buffer);
3318 return retcode;
3319 }
3320
3321 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3322 // read file into buffer
3323 int fd = ::open(file_name, O_RDONLY);
3324 if (fd < 0) {
3325 jio_fprintf(defaultStream::error_stream(),
3326 "Could not open options file '%s'\n",
3327 file_name);
3328 return JNI_ERR;
3329 }
3330
3331 struct stat stbuf;
3332 int retcode = os::stat(file_name, &stbuf);
3333 if (retcode != 0) {
3334 jio_fprintf(defaultStream::error_stream(),
3335 "Could not stat options file '%s'\n",
3336 file_name);
3337 os::close(fd);
3338 return JNI_ERR;
3339 }
3340
3341 if (stbuf.st_size == 0) {
3342 // tell caller there is no option data and that is ok
3343 os::close(fd);
3344 return JNI_OK;
3345 }
3346
3347 // '+ 1' for NULL termination even with max bytes
3348 size_t bytes_alloc = stbuf.st_size + 1;
3349
3350 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3351 if (NULL == buf) {
3352 jio_fprintf(defaultStream::error_stream(),
3353 "Could not allocate read buffer for options file parse\n");
3354 os::close(fd);
3355 return JNI_ENOMEM;
3356 }
3357
3358 memset(buf, 0, bytes_alloc);
3359
3360 // Fill buffer
3361 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3362 os::close(fd);
3363 if (bytes_read < 0) {
3364 FREE_C_HEAP_ARRAY(char, buf);
3365 jio_fprintf(defaultStream::error_stream(),
3366 "Could not read options file '%s'\n", file_name);
3367 return JNI_ERR;
3368 }
3369
3370 if (bytes_read == 0) {
3371 // tell caller there is no option data and that is ok
3372 FREE_C_HEAP_ARRAY(char, buf);
3373 return JNI_OK;
3374 }
3375
3376 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3377
3378 FREE_C_HEAP_ARRAY(char, buf);
3379 return retcode;
3380 }
3381
3382 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3383 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3384
3385 // some pointers to help with parsing
3386 char *buffer_end = buffer + buf_len;
3387 char *opt_hd = buffer;
3388 char *wrt = buffer;
3389 char *rd = buffer;
3390
3391 // parse all options
3392 while (rd < buffer_end) {
3393 // skip leading white space from the input string
3394 while (rd < buffer_end && isspace(*rd)) {
3395 rd++;
3396 }
3397
3398 if (rd >= buffer_end) {
3399 break;
3400 }
3401
3402 // Remember this is where we found the head of the token.
3403 opt_hd = wrt;
3404
3405 // Tokens are strings of non white space characters separated
3406 // by one or more white spaces.
3407 while (rd < buffer_end && !isspace(*rd)) {
3408 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3409 int quote = *rd; // matching quote to look for
3410 rd++; // don't copy open quote
3411 while (rd < buffer_end && *rd != quote) {
3412 // include everything (even spaces)
3413 // up until the close quote
3414 *wrt++ = *rd++; // copy to option string
3415 }
3416
3417 if (rd < buffer_end) {
3418 rd++; // don't copy close quote
3419 } else {
3420 // did not see closing quote
3421 jio_fprintf(defaultStream::error_stream(),
3422 "Unmatched quote in %s\n", name);
3423 delete options;
3424 return JNI_ERR;
3425 }
3426 } else {
3427 *wrt++ = *rd++; // copy to option string
3428 }
3429 }
3430
3431 // steal a white space character and set it to NULL
3432 *wrt++ = '\0';
3433 // We now have a complete token
3434
3435 JavaVMOption option;
3436 option.optionString = opt_hd;
3437 option.extraInfo = NULL;
3438
3439 options->append(option); // Fill in option
3440
3441 rd++; // Advance to next character
3442 }
3443
3444 // Fill out JavaVMInitArgs structure.
3445 jint status = vm_args->set_args(options);
3446
3447 delete options;
3448 return status;
3449 }
3450
3451 void Arguments::set_shared_spaces_flags() {
3452 if (DumpSharedSpaces) {
3453 if (RequireSharedSpaces) {
3454 warning("Cannot dump shared archive while using shared archive");
3455 }
3456 UseSharedSpaces = false;
3457 #ifdef _LP64
3458 if (!UseCompressedOops || !UseCompressedClassPointers) {
3459 vm_exit_during_initialization(
3460 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3461 }
3462 } else {
3463 if (!UseCompressedOops || !UseCompressedClassPointers) {
3464 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3465 }
3466 #endif
3467 }
3468 }
3469
3470 #if INCLUDE_CDS
3471 // Sharing support
3472 // Construct the path to the archive
3473 char* Arguments::get_default_shared_archive_path() {
3474 char *default_archive_path;
3475 char jvm_path[JVM_MAXPATHLEN];
3476 os::jvm_path(jvm_path, sizeof(jvm_path));
3477 char *end = strrchr(jvm_path, *os::file_separator());
3478 if (end != NULL) *end = '\0';
3479 size_t jvm_path_len = strlen(jvm_path);
3480 size_t file_sep_len = strlen(os::file_separator());
3481 const size_t len = jvm_path_len + file_sep_len + 20;
3482 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3483 if (default_archive_path != NULL) {
3484 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3485 jvm_path, os::file_separator());
3486 }
3487 return default_archive_path;
3488 }
3489
3490 int Arguments::num_archives(const char* archive_path) {
3491 if (archive_path == NULL) {
3492 return 0;
3493 }
3494 int npaths = 1;
3495 char* p = (char*)archive_path;
3496 while (*p != '\0') {
3497 if (*p == os::path_separator()[0]) {
3498 npaths++;
3499 }
3500 p++;
3501 }
3502 return npaths;
3503 }
3504
3505 void Arguments::extract_shared_archive_paths(const char* archive_path,
3506 char** base_archive_path,
3507 char** top_archive_path) {
3508 char* begin_ptr = (char*)archive_path;
3509 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3510 if (end_ptr == NULL || end_ptr == begin_ptr) {
3511 vm_exit_during_initialization("Base archive was not specified", archive_path);
3512 }
3513 size_t len = end_ptr - begin_ptr;
3514 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3515 strncpy(cur_path, begin_ptr, len);
3516 cur_path[len] = '\0';
3517 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3518 *base_archive_path = cur_path;
3519
3520 begin_ptr = ++end_ptr;
3521 if (*begin_ptr == '\0') {
3522 vm_exit_during_initialization("Top archive was not specified", archive_path);
3523 }
3524 end_ptr = strchr(begin_ptr, '\0');
3525 assert(end_ptr != NULL, "sanity");
3526 len = end_ptr - begin_ptr;
3527 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3528 strncpy(cur_path, begin_ptr, len + 1);
3529 //cur_path[len] = '\0';
3530 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3531 *top_archive_path = cur_path;
3532 }
3533
3534 bool Arguments::init_shared_archive_paths() {
3535 if (ArchiveClassesAtExit != NULL) {
3536 if (DumpSharedSpaces) {
3537 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3538 }
3539 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3540 return false;
3541 }
3542 check_unsupported_dumping_properties();
3543 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3544 }
3545 if (SharedArchiveFile == NULL) {
3546 SharedArchivePath = get_default_shared_archive_path();
3547 } else {
3548 int archives = num_archives(SharedArchiveFile);
3549 if (DynamicDumpSharedSpaces || DumpSharedSpaces) {
3550 if (archives > 1) {
3551 vm_exit_during_initialization(
3552 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3553 }
3554 if (DynamicDumpSharedSpaces) {
3555 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3556 vm_exit_during_initialization(
3557 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3558 SharedArchiveFile);
3559 }
3560 }
3561 }
3562 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){
3563 if (archives > 2) {
3564 vm_exit_during_initialization(
3565 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3566 }
3567 if (archives == 1) {
3568 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3569 int name_size;
3570 bool success =
3571 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3572 if (!success) {
3573 SharedArchivePath = temp_archive_path;
3574 } else {
3575 SharedDynamicArchivePath = temp_archive_path;
3576 }
3577 } else {
3578 extract_shared_archive_paths((const char*)SharedArchiveFile,
3579 &SharedArchivePath, &SharedDynamicArchivePath);
3580 }
3581 } else { // CDS dumping
3582 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3583 }
3584 }
3585 return (SharedArchivePath != NULL);
3586 }
3587 #endif // INCLUDE_CDS
3588
3589 #ifndef PRODUCT
3590 // Determine whether LogVMOutput should be implicitly turned on.
3591 static bool use_vm_log() {
3592 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3593 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3594 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3595 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3596 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3597 return true;
3598 }
3599
3600 #ifdef COMPILER1
3601 if (PrintC1Statistics) {
3602 return true;
3603 }
3604 #endif // COMPILER1
3605
3606 #ifdef COMPILER2
3607 if (PrintOptoAssembly || PrintOptoStatistics) {
3608 return true;
3609 }
3610 #endif // COMPILER2
3611
3612 return false;
3613 }
3614
3615 #endif // PRODUCT
3616
3617 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3618 for (int index = 0; index < args->nOptions; index++) {
3619 const JavaVMOption* option = args->options + index;
3620 const char* tail;
3621 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3622 return true;
3623 }
3624 }
3625 return false;
3626 }
3627
3628 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3629 const char* vm_options_file,
3630 const int vm_options_file_pos,
3631 ScopedVMInitArgs* vm_options_file_args,
3632 ScopedVMInitArgs* args_out) {
3633 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3634 if (code != JNI_OK) {
3635 return code;
3636 }
3637
3638 if (vm_options_file_args->get()->nOptions < 1) {
3639 return JNI_OK;
3640 }
3641
3642 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3643 jio_fprintf(defaultStream::error_stream(),
3644 "A VM options file may not refer to a VM options file. "
3645 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3646 "options file '%s' in options container '%s' is an error.\n",
3647 vm_options_file_args->vm_options_file_arg(),
3648 vm_options_file_args->container_name());
3649 return JNI_EINVAL;
3650 }
3651
3652 return args_out->insert(args, vm_options_file_args->get(),
3653 vm_options_file_pos);
3654 }
3655
3656 // Expand -XX:VMOptionsFile found in args_in as needed.
3657 // mod_args and args_out parameters may return values as needed.
3658 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3659 ScopedVMInitArgs* mod_args,
3660 JavaVMInitArgs** args_out) {
3661 jint code = match_special_option_and_act(args_in, mod_args);
3662 if (code != JNI_OK) {
3663 return code;
3664 }
3665
3666 if (mod_args->is_set()) {
3667 // args_in contains -XX:VMOptionsFile and mod_args contains the
3668 // original options from args_in along with the options expanded
3669 // from the VMOptionsFile. Return a short-hand to the caller.
3670 *args_out = mod_args->get();
3671 } else {
3672 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3673 }
3674 return JNI_OK;
3675 }
3676
3677 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3678 ScopedVMInitArgs* args_out) {
3679 // Remaining part of option string
3680 const char* tail;
3681 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3682
3683 for (int index = 0; index < args->nOptions; index++) {
3684 const JavaVMOption* option = args->options + index;
3685 if (match_option(option, "-XX:Flags=", &tail)) {
3686 Arguments::set_jvm_flags_file(tail);
3687 continue;
3688 }
3689 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3690 if (vm_options_file_args.found_vm_options_file_arg()) {
3691 jio_fprintf(defaultStream::error_stream(),
3692 "The option '%s' is already specified in the options "
3693 "container '%s' so the specification of '%s' in the "
3694 "same options container is an error.\n",
3695 vm_options_file_args.vm_options_file_arg(),
3696 vm_options_file_args.container_name(),
3697 option->optionString);
3698 return JNI_EINVAL;
3699 }
3700 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3701 // If there's a VMOptionsFile, parse that
3702 jint code = insert_vm_options_file(args, tail, index,
3703 &vm_options_file_args, args_out);
3704 if (code != JNI_OK) {
3705 return code;
3706 }
3707 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3708 if (args_out->is_set()) {
3709 // The VMOptions file inserted some options so switch 'args'
3710 // to the new set of options, and continue processing which
3711 // preserves "last option wins" semantics.
3712 args = args_out->get();
3713 // The first option from the VMOptionsFile replaces the
3714 // current option. So we back track to process the
3715 // replacement option.
3716 index--;
3717 }
3718 continue;
3719 }
3720 if (match_option(option, "-XX:+PrintVMOptions")) {
3721 PrintVMOptions = true;
3722 continue;
3723 }
3724 if (match_option(option, "-XX:-PrintVMOptions")) {
3725 PrintVMOptions = false;
3726 continue;
3727 }
3728 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3729 IgnoreUnrecognizedVMOptions = true;
3730 continue;
3731 }
3732 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3733 IgnoreUnrecognizedVMOptions = false;
3734 continue;
3735 }
3736 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3737 JVMFlag::printFlags(tty, false);
3738 vm_exit(0);
3739 }
3740 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3741 #if INCLUDE_NMT
3742 // The launcher did not setup nmt environment variable properly.
3743 if (!MemTracker::check_launcher_nmt_support(tail)) {
3744 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3745 }
3746
3747 // Verify if nmt option is valid.
3748 if (MemTracker::verify_nmt_option()) {
3749 // Late initialization, still in single-threaded mode.
3750 if (MemTracker::tracking_level() >= NMT_summary) {
3751 MemTracker::init();
3752 }
3753 } else {
3754 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3755 }
3756 continue;
3757 #else
3758 jio_fprintf(defaultStream::error_stream(),
3759 "Native Memory Tracking is not supported in this VM\n");
3760 return JNI_ERR;
3761 #endif
3762 }
3763
3764 #ifndef PRODUCT
3765 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3766 JVMFlag::printFlags(tty, true);
3767 vm_exit(0);
3768 }
3769 #endif
3770 }
3771 return JNI_OK;
3772 }
3773
3774 static void print_options(const JavaVMInitArgs *args) {
3775 const char* tail;
3776 for (int index = 0; index < args->nOptions; index++) {
3777 const JavaVMOption *option = args->options + index;
3778 if (match_option(option, "-XX:", &tail)) {
3779 logOption(tail);
3780 }
3781 }
3782 }
3783
3784 bool Arguments::handle_deprecated_print_gc_flags() {
3785 if (PrintGC) {
3786 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3787 }
3788 if (PrintGCDetails) {
3789 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3790 }
3791
3792 if (_gc_log_filename != NULL) {
3793 // -Xloggc was used to specify a filename
3794 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3795
3796 LogTarget(Error, logging) target;
3797 LogStream errstream(target);
3798 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3799 } else if (PrintGC || PrintGCDetails) {
3800 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3801 }
3802 return true;
3803 }
3804
3805 void Arguments::handle_extra_cms_flags(const char* msg) {
3806 SpecialFlag flag;
3807 const char *flag_name = "UseConcMarkSweepGC";
3808 if (lookup_special_flag(flag_name, flag)) {
3809 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3810 warning("%s", msg);
3811 }
3812 }
3813
3814 // Parse entry point called from JNI_CreateJavaVM
3815
3816 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3817 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3818
3819 // Initialize ranges, constraints and writeables
3820 JVMFlagRangeList::init();
3821 JVMFlagConstraintList::init();
3822 JVMFlagWriteableList::init();
3823
3824 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3825 const char* hotspotrc = ".hotspotrc";
3826 bool settings_file_specified = false;
3827 bool needs_hotspotrc_warning = false;
3828 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3829 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3830
3831 // Pointers to current working set of containers
3832 JavaVMInitArgs* cur_cmd_args;
3833 JavaVMInitArgs* cur_java_options_args;
3834 JavaVMInitArgs* cur_java_tool_options_args;
3835
3836 // Containers for modified/expanded options
3837 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3838 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3839 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3840
3841
3842 jint code =
3843 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3844 if (code != JNI_OK) {
3845 return code;
3846 }
3847
3848 code = parse_java_options_environment_variable(&initial_java_options_args);
3849 if (code != JNI_OK) {
3850 return code;
3851 }
3852
3853 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3854 &mod_java_tool_options_args,
3855 &cur_java_tool_options_args);
3856 if (code != JNI_OK) {
3857 return code;
3858 }
3859
3860 code = expand_vm_options_as_needed(initial_cmd_args,
3861 &mod_cmd_args,
3862 &cur_cmd_args);
3863 if (code != JNI_OK) {
3864 return code;
3865 }
3866
3867 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3868 &mod_java_options_args,
3869 &cur_java_options_args);
3870 if (code != JNI_OK) {
3871 return code;
3872 }
3873
3874 const char* flags_file = Arguments::get_jvm_flags_file();
3875 settings_file_specified = (flags_file != NULL);
3876
3877 if (IgnoreUnrecognizedVMOptions) {
3878 cur_cmd_args->ignoreUnrecognized = true;
3879 cur_java_tool_options_args->ignoreUnrecognized = true;
3880 cur_java_options_args->ignoreUnrecognized = true;
3881 }
3882
3883 // Parse specified settings file
3884 if (settings_file_specified) {
3885 if (!process_settings_file(flags_file, true,
3886 cur_cmd_args->ignoreUnrecognized)) {
3887 return JNI_EINVAL;
3888 }
3889 } else {
3890 #ifdef ASSERT
3891 // Parse default .hotspotrc settings file
3892 if (!process_settings_file(".hotspotrc", false,
3893 cur_cmd_args->ignoreUnrecognized)) {
3894 return JNI_EINVAL;
3895 }
3896 #else
3897 struct stat buf;
3898 if (os::stat(hotspotrc, &buf) == 0) {
3899 needs_hotspotrc_warning = true;
3900 }
3901 #endif
3902 }
3903
3904 if (PrintVMOptions) {
3905 print_options(cur_java_tool_options_args);
3906 print_options(cur_cmd_args);
3907 print_options(cur_java_options_args);
3908 }
3909
3910 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3911 jint result = parse_vm_init_args(cur_java_tool_options_args,
3912 cur_java_options_args,
3913 cur_cmd_args);
3914
3915 if (result != JNI_OK) {
3916 return result;
3917 }
3918
3919 #if INCLUDE_CDS
3920 // Initialize shared archive paths which could include both base and dynamic archive paths
3921 if (!init_shared_archive_paths()) {
3922 return JNI_ENOMEM;
3923 }
3924 #endif
3925
3926 // Delay warning until here so that we've had a chance to process
3927 // the -XX:-PrintWarnings flag
3928 if (needs_hotspotrc_warning) {
3929 warning("%s file is present but has been ignored. "
3930 "Run with -XX:Flags=%s to load the file.",
3931 hotspotrc, hotspotrc);
3932 }
3933
3934 if (needs_module_property_warning) {
3935 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3936 " names that are reserved for internal use.");
3937 }
3938
3939 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3940 UNSUPPORTED_OPTION(UseLargePages);
3941 #endif
3942
3943 #if defined(AIX)
3944 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3945 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3946 #endif
3947
3948 #ifndef PRODUCT
3949 if (TraceBytecodesAt != 0) {
3950 TraceBytecodes = true;
3951 }
3952 if (CountCompiledCalls) {
3953 if (UseCounterDecay) {
3954 warning("UseCounterDecay disabled because CountCalls is set");
3955 UseCounterDecay = false;
3956 }
3957 }
3958 #endif // PRODUCT
3959
3960 if (ScavengeRootsInCode == 0) {
3961 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3962 warning("Forcing ScavengeRootsInCode non-zero");
3963 }
3964 ScavengeRootsInCode = 1;
3965 }
3966
3967 if (!handle_deprecated_print_gc_flags()) {
3968 return JNI_EINVAL;
3969 }
3970
3971 // Set object alignment values.
3972 set_object_alignment();
3973
3974 #if !INCLUDE_CDS
3975 if (DumpSharedSpaces || RequireSharedSpaces) {
3976 jio_fprintf(defaultStream::error_stream(),
3977 "Shared spaces are not supported in this VM\n");
3978 return JNI_ERR;
3979 }
3980 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3981 log_is_enabled(Info, cds)) {
3982 warning("Shared spaces are not supported in this VM");
3983 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3984 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3985 }
3986 no_shared_spaces("CDS Disabled");
3987 #endif // INCLUDE_CDS
3988
3989 return JNI_OK;
3990 }
3991
3992 jint Arguments::apply_ergo() {
3993 // Set flags based on ergonomics.
3994 jint result = set_ergonomics_flags();
3995 if (result != JNI_OK) return result;
3996
3997 // Set heap size based on available physical memory
3998 set_heap_size();
3999
4000 GCConfig::arguments()->initialize();
4001
4002 set_shared_spaces_flags();
4003
4004 // Initialize Metaspace flags and alignments
4005 Metaspace::ergo_initialize();
4006
4007 // Set compiler flags after GC is selected and GC specific
4008 // flags (LoopStripMiningIter) are set.
4009 CompilerConfig::ergo_initialize();
4010
4011 // Set bytecode rewriting flags
4012 set_bytecode_flags();
4013
4014 // Set flags if aggressive optimization flags are enabled
4015 jint code = set_aggressive_opts_flags();
4016 if (code != JNI_OK) {
4017 return code;
4018 }
4019
4020 // Turn off biased locking for locking debug mode flags,
4021 // which are subtly different from each other but neither works with
4022 // biased locking
4023 if (UseHeavyMonitors
4024 #ifdef COMPILER1
4025 || !UseFastLocking
4026 #endif // COMPILER1
4027 #if INCLUDE_JVMCI
4028 || !JVMCIUseFastLocking
4029 #endif
4030 ) {
4031 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4032 // flag set to true on command line; warn the user that they
4033 // can't enable biased locking here
4034 warning("Biased Locking is not supported with locking debug flags"
4035 "; ignoring UseBiasedLocking flag." );
4036 }
4037 UseBiasedLocking = false;
4038 }
4039
4040 #ifdef CC_INTERP
4041 // Clear flags not supported on zero.
4042 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4043 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4044 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4045 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4046 #endif // CC_INTERP
4047
4048 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4049 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4050 DebugNonSafepoints = true;
4051 }
4052
4053 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4054 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4055 }
4056
4057 // Treat the odd case where local verification is enabled but remote
4058 // verification is not as if both were enabled.
4059 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4060 log_info(verification)("Turning on remote verification because local verification is on");
4061 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4062 }
4063
4064 #ifndef PRODUCT
4065 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4066 if (use_vm_log()) {
4067 LogVMOutput = true;
4068 }
4069 }
4070 #endif // PRODUCT
4071
4072 if (PrintCommandLineFlags) {
4073 JVMFlag::printSetFlags(tty);
4074 }
4075
4076 // Apply CPU specific policy for the BiasedLocking
4077 if (UseBiasedLocking) {
4078 if (!VM_Version::use_biased_locking() &&
4079 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4080 UseBiasedLocking = false;
4081 }
4082 }
4083 #ifdef COMPILER2
4084 if (!UseBiasedLocking) {
4085 UseOptoBiasInlining = false;
4086 }
4087 #endif
4088
4089 #if defined(IA32)
4090 // Only server compiler can optimize safepoints well enough.
4091 if (!is_server_compilation_mode_vm()) {
4092 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false);
4093 }
4094 #endif
4095
4096 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4097 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4098 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4099 } else {
4100 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4101 }
4102
4103 return JNI_OK;
4104 }
4105
4106 jint Arguments::adjust_after_os() {
4107 if (UseNUMA) {
4108 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4109 FLAG_SET_ERGO(UseNUMA, false);
4110 } else if (UseParallelGC || UseParallelOldGC) {
4111 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4112 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4113 }
4114 }
4115 // UseNUMAInterleaving is set to ON for all collectors and
4116 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4117 // such as the parallel collector for Linux and Solaris will
4118 // interleave old gen and survivor spaces on top of NUMA
4119 // allocation policy for the eden space.
4120 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4121 // all platforms and ParallelGC on Windows will interleave all
4122 // of the heap spaces across NUMA nodes.
4123 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4124 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4125 }
4126 }
4127 return JNI_OK;
4128 }
4129
4130 int Arguments::PropertyList_count(SystemProperty* pl) {
4131 int count = 0;
4132 while(pl != NULL) {
4133 count++;
4134 pl = pl->next();
4135 }
4136 return count;
4137 }
4138
4139 // Return the number of readable properties.
4140 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4141 int count = 0;
4142 while(pl != NULL) {
4143 if (pl->is_readable()) {
4144 count++;
4145 }
4146 pl = pl->next();
4147 }
4148 return count;
4149 }
4150
4151 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4152 assert(key != NULL, "just checking");
4153 SystemProperty* prop;
4154 for (prop = pl; prop != NULL; prop = prop->next()) {
4155 if (strcmp(key, prop->key()) == 0) return prop->value();
4156 }
4157 return NULL;
4158 }
4159
4160 // Return the value of the requested property provided that it is a readable property.
4161 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4162 assert(key != NULL, "just checking");
4163 SystemProperty* prop;
4164 // Return the property value if the keys match and the property is not internal or
4165 // it's the special internal property "jdk.boot.class.path.append".
4166 for (prop = pl; prop != NULL; prop = prop->next()) {
4167 if (strcmp(key, prop->key()) == 0) {
4168 if (!prop->internal()) {
4169 return prop->value();
4170 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4171 return prop->value();
4172 } else {
4173 // Property is internal and not jdk.boot.class.path.append so return NULL.
4174 return NULL;
4175 }
4176 }
4177 }
4178 return NULL;
4179 }
4180
4181 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4182 int count = 0;
4183 const char* ret_val = NULL;
4184
4185 while(pl != NULL) {
4186 if(count >= index) {
4187 ret_val = pl->key();
4188 break;
4189 }
4190 count++;
4191 pl = pl->next();
4192 }
4193
4194 return ret_val;
4195 }
4196
4197 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4198 int count = 0;
4199 char* ret_val = NULL;
4200
4201 while(pl != NULL) {
4202 if(count >= index) {
4203 ret_val = pl->value();
4204 break;
4205 }
4206 count++;
4207 pl = pl->next();
4208 }
4209
4210 return ret_val;
4211 }
4212
4213 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4214 SystemProperty* p = *plist;
4215 if (p == NULL) {
4216 *plist = new_p;
4217 } else {
4218 while (p->next() != NULL) {
4219 p = p->next();
4220 }
4221 p->set_next(new_p);
4222 }
4223 }
4224
4225 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4226 bool writeable, bool internal) {
4227 if (plist == NULL)
4228 return;
4229
4230 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4231 PropertyList_add(plist, new_p);
4232 }
4233
4234 void Arguments::PropertyList_add(SystemProperty *element) {
4235 PropertyList_add(&_system_properties, element);
4236 }
4237
4238 // This add maintains unique property key in the list.
4239 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4240 PropertyAppendable append, PropertyWriteable writeable,
4241 PropertyInternal internal) {
4242 if (plist == NULL)
4243 return;
4244
4245 // If property key exist then update with new value.
4246 SystemProperty* prop;
4247 for (prop = *plist; prop != NULL; prop = prop->next()) {
4248 if (strcmp(k, prop->key()) == 0) {
4249 if (append == AppendProperty) {
4250 prop->append_value(v);
4251 } else {
4252 prop->set_value(v);
4253 }
4254 return;
4255 }
4256 }
4257
4258 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4259 }
4260
4261 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4262 // Returns true if all of the source pointed by src has been copied over to
4263 // the destination buffer pointed by buf. Otherwise, returns false.
4264 // Notes:
4265 // 1. If the length (buflen) of the destination buffer excluding the
4266 // NULL terminator character is not long enough for holding the expanded
4267 // pid characters, it also returns false instead of returning the partially
4268 // expanded one.
4269 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4270 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4271 char* buf, size_t buflen) {
4272 const char* p = src;
4273 char* b = buf;
4274 const char* src_end = &src[srclen];
4275 char* buf_end = &buf[buflen - 1];
4276
4277 while (p < src_end && b < buf_end) {
4278 if (*p == '%') {
4279 switch (*(++p)) {
4280 case '%': // "%%" ==> "%"
4281 *b++ = *p++;
4282 break;
4283 case 'p': { // "%p" ==> current process id
4284 // buf_end points to the character before the last character so
4285 // that we could write '\0' to the end of the buffer.
4286 size_t buf_sz = buf_end - b + 1;
4287 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4288
4289 // if jio_snprintf fails or the buffer is not long enough to hold
4290 // the expanded pid, returns false.
4291 if (ret < 0 || ret >= (int)buf_sz) {
4292 return false;
4293 } else {
4294 b += ret;
4295 assert(*b == '\0', "fail in copy_expand_pid");
4296 if (p == src_end && b == buf_end + 1) {
4297 // reach the end of the buffer.
4298 return true;
4299 }
4300 }
4301 p++;
4302 break;
4303 }
4304 default :
4305 *b++ = '%';
4306 }
4307 } else {
4308 *b++ = *p++;
4309 }
4310 }
4311 *b = '\0';
4312 return (p == src_end); // return false if not all of the source was copied
4313 }