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 { "FailOverToOldVerifier", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() },
537 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
538 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
539 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
540
541 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
542 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
543 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
544 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
545
546 // -------------- Obsolete Flags - sorted by expired_in --------------
547 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
548 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
549 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
550 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
551 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
552 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
553 { "ProfilerPrintByteCodeStatistics", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
554 { "ProfilerRecordPC", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
555 { "ProfileVM", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
556 { "ProfileIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
557 { "ProfileIntervalsTicks", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
558 { "ProfilerCheckIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
559 { "ProfilerNumberOfInterpretedMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
560 { "ProfilerNumberOfCompiledMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
561 { "ProfilerNumberOfStubMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
562 { "ProfilerNumberOfRuntimeStubNodes", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
563 { "UseImplicitStableValues", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
564 { "NeedsDeoptSuspend", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
565
566 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
567 // These entries will generate build errors. Their purpose is to test the macros.
568 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
569 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
570 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
571 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
572 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
573 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
574 #endif
575
576 { NULL, JDK_Version(0), JDK_Version(0) }
577 };
578
579 // Flags that are aliases for other flags.
580 typedef struct {
581 const char* alias_name;
582 const char* real_name;
583 } AliasedFlag;
584
585 static AliasedFlag const aliased_jvm_flags[] = {
586 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
587 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
588 { NULL, NULL}
589 };
590
591 // NOTE: A compatibility request will be necessary for each alias to be removed.
592 static AliasedLoggingFlag const aliased_logging_flags[] = {
593 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
594 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
595 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
596 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
597 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
598 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
599 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
600 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
601 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
602 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
603 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
604 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
605 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
606 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
607 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
608 };
609
610 #ifndef PRODUCT
611 // These options are removed in jdk9. Remove this code for jdk10.
612 static AliasedFlag const removed_develop_logging_flags[] = {
613 { "TraceClassInitialization", "-Xlog:class+init" },
614 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
615 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
616 { "TraceItables", "-Xlog:itables=debug" },
617 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
618 { "TraceSafepoint", "-Xlog:safepoint=debug" },
619 { "TraceStartupTime", "-Xlog:startuptime" },
620 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
621 { "PrintVtables", "-Xlog:vtables=debug" },
622 { "VerboseVerification", "-Xlog:verification" },
623 { NULL, NULL }
624 };
625 #endif //PRODUCT
626
627 // Return true if "v" is less than "other", where "other" may be "undefined".
628 static bool version_less_than(JDK_Version v, JDK_Version other) {
629 assert(!v.is_undefined(), "must be defined");
630 if (!other.is_undefined() && v.compare(other) >= 0) {
631 return false;
632 } else {
633 return true;
634 }
635 }
636
637 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
638
639 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
640 // Allow extensions to have priority
641 if (lookup_special_flag_ext(flag_name, flag)) {
642 return true;
643 }
644
645 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
646 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
647 flag = special_jvm_flags[i];
648 return true;
649 }
650 }
651 return false;
652 }
653
654 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
655 assert(version != NULL, "Must provide a version buffer");
656 SpecialFlag flag;
657 if (lookup_special_flag(flag_name, flag)) {
658 if (!flag.obsolete_in.is_undefined()) {
659 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
660 *version = flag.obsolete_in;
661 return true;
662 }
663 }
664 }
665 return false;
666 }
667
668 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
669 assert(version != NULL, "Must provide a version buffer");
670 SpecialFlag flag;
671 if (lookup_special_flag(flag_name, flag)) {
672 if (!flag.deprecated_in.is_undefined()) {
673 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
674 version_less_than(JDK_Version::current(), flag.expired_in)) {
675 *version = flag.deprecated_in;
676 return 1;
677 } else {
678 return -1;
679 }
680 }
681 }
682 return 0;
683 }
684
685 #ifndef PRODUCT
686 const char* Arguments::removed_develop_logging_flag_name(const char* name){
687 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
688 const AliasedFlag& flag = removed_develop_logging_flags[i];
689 if (strcmp(flag.alias_name, name) == 0) {
690 return flag.real_name;
691 }
692 }
693 return NULL;
694 }
695 #endif // PRODUCT
696
697 const char* Arguments::real_flag_name(const char *flag_name) {
698 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
699 const AliasedFlag& flag_status = aliased_jvm_flags[i];
700 if (strcmp(flag_status.alias_name, flag_name) == 0) {
701 return flag_status.real_name;
702 }
703 }
704 return flag_name;
705 }
706
707 #ifdef ASSERT
708 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
709 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
710 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
711 return true;
712 }
713 }
714 return false;
715 }
716
717 // Verifies the correctness of the entries in the special_jvm_flags table.
718 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
719 // version being earlier than the deprecation version, then a warning is issued
720 // and verification fails - by returning false. If it is detected that the table
721 // is out of date, with respect to the current version, then a warning is issued
722 // but verification does not fail. This allows the VM to operate when the version
723 // is first updated, without needing to update all the impacted flags at the
724 // same time.
725 static bool verify_special_jvm_flags() {
726 bool success = true;
727 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
728 const SpecialFlag& flag = special_jvm_flags[i];
729 if (lookup_special_flag(flag.name, i)) {
730 warning("Duplicate special flag declaration \"%s\"", flag.name);
731 success = false;
732 }
733 if (flag.deprecated_in.is_undefined() &&
734 flag.obsolete_in.is_undefined()) {
735 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
736 success = false;
737 }
738
739 if (!flag.deprecated_in.is_undefined()) {
740 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
741 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
742 success = false;
743 }
744
745 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
746 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
747 success = false;
748 }
749 }
750
751 if (!flag.obsolete_in.is_undefined()) {
752 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
753 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
754 success = false;
755 }
756
757 // if flag has become obsolete it should not have a "globals" flag defined anymore.
758 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
759 if (JVMFlag::find_flag(flag.name) != NULL) {
760 // Temporarily disable the warning: 8196739
761 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
762 }
763 }
764 }
765
766 if (!flag.expired_in.is_undefined()) {
767 // if flag has become expired it should not have a "globals" flag defined anymore.
768 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
769 if (JVMFlag::find_flag(flag.name) != NULL) {
770 // Temporarily disable the warning: 8196739
771 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
772 }
773 }
774 }
775
776 }
777 return success;
778 }
779 #endif
780
781 // Parses a size specification string.
782 bool Arguments::atojulong(const char *s, julong* result) {
783 julong n = 0;
784
785 // First char must be a digit. Don't allow negative numbers or leading spaces.
786 if (!isdigit(*s)) {
787 return false;
788 }
789
790 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
791 char* remainder;
792 errno = 0;
793 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
794 if (errno != 0) {
795 return false;
796 }
797
798 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
799 if (remainder == s || strlen(remainder) > 1) {
800 return false;
801 }
802
803 switch (*remainder) {
804 case 'T': case 't':
805 *result = n * G * K;
806 // Check for overflow.
807 if (*result/((julong)G * K) != n) return false;
808 return true;
809 case 'G': case 'g':
810 *result = n * G;
811 if (*result/G != n) return false;
812 return true;
813 case 'M': case 'm':
814 *result = n * M;
815 if (*result/M != n) return false;
816 return true;
817 case 'K': case 'k':
818 *result = n * K;
819 if (*result/K != n) return false;
820 return true;
821 case '\0':
822 *result = n;
823 return true;
824 default:
825 return false;
826 }
827 }
828
829 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
830 if (size < min_size) return arg_too_small;
831 if (size > max_size) return arg_too_big;
832 return arg_in_range;
833 }
834
835 // Describe an argument out of range error
836 void Arguments::describe_range_error(ArgsRange errcode) {
837 switch(errcode) {
838 case arg_too_big:
839 jio_fprintf(defaultStream::error_stream(),
840 "The specified size exceeds the maximum "
841 "representable size.\n");
842 break;
843 case arg_too_small:
844 case arg_unreadable:
845 case arg_in_range:
846 // do nothing for now
847 break;
848 default:
849 ShouldNotReachHere();
850 }
851 }
852
853 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
854 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
855 return true;
856 } else {
857 return false;
858 }
859 }
860
861 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
862 char* end;
863 errno = 0;
864 double v = strtod(value, &end);
865 if ((errno != 0) || (*end != 0)) {
866 return false;
867 }
868
869 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
870 return true;
871 }
872 return false;
873 }
874
875 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
876 julong v;
877 int int_v;
878 intx intx_v;
879 bool is_neg = false;
880 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
881
882 if (result == NULL) {
883 return false;
884 }
885
886 // Check the sign first since atojulong() parses only unsigned values.
887 if (*value == '-') {
888 if (!result->is_intx() && !result->is_int()) {
889 return false;
890 }
891 value++;
892 is_neg = true;
893 }
894 if (!Arguments::atojulong(value, &v)) {
895 return false;
896 }
897 if (result->is_int()) {
898 int_v = (int) v;
899 if (is_neg) {
900 int_v = -int_v;
901 }
902 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
903 } else if (result->is_uint()) {
904 uint uint_v = (uint) v;
905 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
906 } else if (result->is_intx()) {
907 intx_v = (intx) v;
908 if (is_neg) {
909 intx_v = -intx_v;
910 }
911 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
912 } else if (result->is_uintx()) {
913 uintx uintx_v = (uintx) v;
914 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
915 } else if (result->is_uint64_t()) {
916 uint64_t uint64_t_v = (uint64_t) v;
917 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
918 } else if (result->is_size_t()) {
919 size_t size_t_v = (size_t) v;
920 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
921 } else if (result->is_double()) {
922 double double_v = (double) v;
923 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
924 } else {
925 return false;
926 }
927 }
928
929 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
930 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
931 // Contract: JVMFlag always returns a pointer that needs freeing.
932 FREE_C_HEAP_ARRAY(char, value);
933 return true;
934 }
935
936 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
937 const char* old_value = "";
938 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
939 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
940 size_t new_len = strlen(new_value);
941 const char* value;
942 char* free_this_too = NULL;
943 if (old_len == 0) {
944 value = new_value;
945 } else if (new_len == 0) {
946 value = old_value;
947 } else {
948 size_t length = old_len + 1 + new_len + 1;
949 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
950 // each new setting adds another LINE to the switch:
951 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
952 value = buf;
953 free_this_too = buf;
954 }
955 (void) JVMFlag::ccstrAtPut(name, &value, origin);
956 // JVMFlag always returns a pointer that needs freeing.
957 FREE_C_HEAP_ARRAY(char, value);
958 if (free_this_too != NULL) {
959 // JVMFlag made its own copy, so I must delete my own temp. buffer.
960 FREE_C_HEAP_ARRAY(char, free_this_too);
961 }
962 return true;
963 }
964
965 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
966 const char* real_name = real_flag_name(arg);
967 JDK_Version since = JDK_Version();
968 switch (is_deprecated_flag(arg, &since)) {
969 case -1:
970 return NULL; // obsolete or expired, don't process normally
971 case 0:
972 return real_name;
973 case 1: {
974 if (warn) {
975 char version[256];
976 since.to_string(version, sizeof(version));
977 if (real_name != arg) {
978 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
979 arg, version, real_name);
980 } else {
981 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
982 arg, version);
983 }
984 }
985 return real_name;
986 }
987 }
988 ShouldNotReachHere();
989 return NULL;
990 }
991
992 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
993 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
994 // Set tagset string buffer at max size of 256, large enough for any alias tagset
995 const int max_tagset_size = 256;
996 int max_tagset_len = max_tagset_size - 1;
997 char tagset_buffer[max_tagset_size];
998 tagset_buffer[0] = '\0';
999
1000 // Write tag-set for aliased logging option, in string list form
1001 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1002 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1003 if (i > 0) {
1004 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1005 }
1006 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1007 }
1008 if (!alf.exactMatch) {
1009 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1010 }
1011 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1012 (on) ? "+" : "-",
1013 name,
1014 tagset_buffer,
1015 (on) ? LogLevel::name(alf.level) : "off");
1016 }
1017
1018 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1019 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1020 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1021 if (strcmp(alf.alias_name, name) == 0) {
1022 log_deprecated_flag(name, on, alf);
1023 return alf;
1024 }
1025 }
1026 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1027 return a;
1028 }
1029
1030 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1031
1032 // range of acceptable characters spelled out for portability reasons
1033 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1034 #define BUFLEN 255
1035 char name[BUFLEN+1];
1036 char dummy;
1037 const char* real_name;
1038 bool warn_if_deprecated = true;
1039
1040 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1041 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1042 if (alf.alias_name != NULL){
1043 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1044 return true;
1045 }
1046 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1047 if (real_name == NULL) {
1048 return false;
1049 }
1050 return set_bool_flag(real_name, false, origin);
1051 }
1052 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1053 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1054 if (alf.alias_name != NULL){
1055 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1056 return true;
1057 }
1058 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1059 if (real_name == NULL) {
1060 return false;
1061 }
1062 return set_bool_flag(real_name, true, origin);
1063 }
1064
1065 char punct;
1066 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1067 const char* value = strchr(arg, '=') + 1;
1068 JVMFlag* flag;
1069
1070 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1071 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1072 if (alf.alias_name != NULL) {
1073 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1074 return true;
1075 }
1076 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1077 if (real_name == NULL) {
1078 return false;
1079 }
1080 flag = JVMFlag::find_flag(real_name);
1081 if (flag != NULL && flag->is_ccstr()) {
1082 if (flag->ccstr_accumulates()) {
1083 return append_to_string_flag(real_name, value, origin);
1084 } else {
1085 if (value[0] == '\0') {
1086 value = NULL;
1087 }
1088 return set_string_flag(real_name, value, origin);
1089 }
1090 } else {
1091 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1092 }
1093 }
1094
1095 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1096 const char* value = strchr(arg, '=') + 1;
1097 // -XX:Foo:=xxx will reset the string flag to the given value.
1098 if (value[0] == '\0') {
1099 value = NULL;
1100 }
1101 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1102 if (real_name == NULL) {
1103 return false;
1104 }
1105 return set_string_flag(real_name, value, origin);
1106 }
1107
1108 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1109 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1110 #define NUMBER_RANGE "[0123456789eE+-]"
1111 char value[BUFLEN + 1];
1112 char value2[BUFLEN + 1];
1113 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1114 // Looks like a floating-point number -- try again with more lenient format string
1115 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1116 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1117 if (real_name == NULL) {
1118 return false;
1119 }
1120 return set_fp_numeric_flag(real_name, value, origin);
1121 }
1122 }
1123
1124 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1125 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1126 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1127 if (real_name == NULL) {
1128 return false;
1129 }
1130 return set_numeric_flag(real_name, value, origin);
1131 }
1132
1133 return false;
1134 }
1135
1136 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1137 assert(bldarray != NULL, "illegal argument");
1138
1139 if (arg == NULL) {
1140 return;
1141 }
1142
1143 int new_count = *count + 1;
1144
1145 // expand the array and add arg to the last element
1146 if (*bldarray == NULL) {
1147 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1148 } else {
1149 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1150 }
1151 (*bldarray)[*count] = os::strdup_check_oom(arg);
1152 *count = new_count;
1153 }
1154
1155 void Arguments::build_jvm_args(const char* arg) {
1156 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1157 }
1158
1159 void Arguments::build_jvm_flags(const char* arg) {
1160 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1161 }
1162
1163 // utility function to return a string that concatenates all
1164 // strings in a given char** array
1165 const char* Arguments::build_resource_string(char** args, int count) {
1166 if (args == NULL || count == 0) {
1167 return NULL;
1168 }
1169 size_t length = 0;
1170 for (int i = 0; i < count; i++) {
1171 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1172 }
1173 char* s = NEW_RESOURCE_ARRAY(char, length);
1174 char* dst = s;
1175 for (int j = 0; j < count; j++) {
1176 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1177 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1178 dst += offset;
1179 length -= offset;
1180 }
1181 return (const char*) s;
1182 }
1183
1184 void Arguments::print_on(outputStream* st) {
1185 st->print_cr("VM Arguments:");
1186 if (num_jvm_flags() > 0) {
1187 st->print("jvm_flags: "); print_jvm_flags_on(st);
1188 st->cr();
1189 }
1190 if (num_jvm_args() > 0) {
1191 st->print("jvm_args: "); print_jvm_args_on(st);
1192 st->cr();
1193 }
1194 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1195 if (_java_class_path != NULL) {
1196 char* path = _java_class_path->value();
1197 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1198 }
1199 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1200 }
1201
1202 void Arguments::print_summary_on(outputStream* st) {
1203 // Print the command line. Environment variables that are helpful for
1204 // reproducing the problem are written later in the hs_err file.
1205 // flags are from setting file
1206 if (num_jvm_flags() > 0) {
1207 st->print_raw("Settings File: ");
1208 print_jvm_flags_on(st);
1209 st->cr();
1210 }
1211 // args are the command line and environment variable arguments.
1212 st->print_raw("Command Line: ");
1213 if (num_jvm_args() > 0) {
1214 print_jvm_args_on(st);
1215 }
1216 // this is the classfile and any arguments to the java program
1217 if (java_command() != NULL) {
1218 st->print("%s", java_command());
1219 }
1220 st->cr();
1221 }
1222
1223 void Arguments::print_jvm_flags_on(outputStream* st) {
1224 if (_num_jvm_flags > 0) {
1225 for (int i=0; i < _num_jvm_flags; i++) {
1226 st->print("%s ", _jvm_flags_array[i]);
1227 }
1228 }
1229 }
1230
1231 void Arguments::print_jvm_args_on(outputStream* st) {
1232 if (_num_jvm_args > 0) {
1233 for (int i=0; i < _num_jvm_args; i++) {
1234 st->print("%s ", _jvm_args_array[i]);
1235 }
1236 }
1237 }
1238
1239 bool Arguments::process_argument(const char* arg,
1240 jboolean ignore_unrecognized,
1241 JVMFlag::Flags origin) {
1242 JDK_Version since = JDK_Version();
1243
1244 if (parse_argument(arg, origin)) {
1245 return true;
1246 }
1247
1248 // Determine if the flag has '+', '-', or '=' characters.
1249 bool has_plus_minus = (*arg == '+' || *arg == '-');
1250 const char* const argname = has_plus_minus ? arg + 1 : arg;
1251
1252 size_t arg_len;
1253 const char* equal_sign = strchr(argname, '=');
1254 if (equal_sign == NULL) {
1255 arg_len = strlen(argname);
1256 } else {
1257 arg_len = equal_sign - argname;
1258 }
1259
1260 // Only make the obsolete check for valid arguments.
1261 if (arg_len <= BUFLEN) {
1262 // Construct a string which consists only of the argument name without '+', '-', or '='.
1263 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1264 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1265 if (is_obsolete_flag(stripped_argname, &since)) {
1266 char version[256];
1267 since.to_string(version, sizeof(version));
1268 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1269 return true;
1270 }
1271 #ifndef PRODUCT
1272 else {
1273 const char* replacement;
1274 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1275 log_warning(arguments)("%s has been removed. Please use %s instead.",
1276 stripped_argname,
1277 replacement);
1278 return false;
1279 }
1280 }
1281 #endif //PRODUCT
1282 }
1283
1284 // For locked flags, report a custom error message if available.
1285 // Otherwise, report the standard unrecognized VM option.
1286 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1287 if (found_flag != NULL) {
1288 char locked_message_buf[BUFLEN];
1289 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1290 if (strlen(locked_message_buf) == 0) {
1291 if (found_flag->is_bool() && !has_plus_minus) {
1292 jio_fprintf(defaultStream::error_stream(),
1293 "Missing +/- setting for VM option '%s'\n", argname);
1294 } else if (!found_flag->is_bool() && has_plus_minus) {
1295 jio_fprintf(defaultStream::error_stream(),
1296 "Unexpected +/- setting in VM option '%s'\n", argname);
1297 } else {
1298 jio_fprintf(defaultStream::error_stream(),
1299 "Improperly specified VM option '%s'\n", argname);
1300 }
1301 } else {
1302 #ifdef PRODUCT
1303 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1304 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1305 if (ignore_unrecognized && mismatched) {
1306 return true;
1307 }
1308 #endif
1309 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1310 }
1311 } else {
1312 if (ignore_unrecognized) {
1313 return true;
1314 }
1315 jio_fprintf(defaultStream::error_stream(),
1316 "Unrecognized VM option '%s'\n", argname);
1317 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1318 if (fuzzy_matched != NULL) {
1319 jio_fprintf(defaultStream::error_stream(),
1320 "Did you mean '%s%s%s'? ",
1321 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1322 fuzzy_matched->_name,
1323 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1324 }
1325 }
1326
1327 // allow for commandline "commenting out" options like -XX:#+Verbose
1328 return arg[0] == '#';
1329 }
1330
1331 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1332 FILE* stream = fopen(file_name, "rb");
1333 if (stream == NULL) {
1334 if (should_exist) {
1335 jio_fprintf(defaultStream::error_stream(),
1336 "Could not open settings file %s\n", file_name);
1337 return false;
1338 } else {
1339 return true;
1340 }
1341 }
1342
1343 char token[1024];
1344 int pos = 0;
1345
1346 bool in_white_space = true;
1347 bool in_comment = false;
1348 bool in_quote = false;
1349 char quote_c = 0;
1350 bool result = true;
1351
1352 int c = getc(stream);
1353 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1354 if (in_white_space) {
1355 if (in_comment) {
1356 if (c == '\n') in_comment = false;
1357 } else {
1358 if (c == '#') in_comment = true;
1359 else if (!isspace(c)) {
1360 in_white_space = false;
1361 token[pos++] = c;
1362 }
1363 }
1364 } else {
1365 if (c == '\n' || (!in_quote && isspace(c))) {
1366 // token ends at newline, or at unquoted whitespace
1367 // this allows a way to include spaces in string-valued options
1368 token[pos] = '\0';
1369 logOption(token);
1370 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1371 build_jvm_flags(token);
1372 pos = 0;
1373 in_white_space = true;
1374 in_quote = false;
1375 } else if (!in_quote && (c == '\'' || c == '"')) {
1376 in_quote = true;
1377 quote_c = c;
1378 } else if (in_quote && (c == quote_c)) {
1379 in_quote = false;
1380 } else {
1381 token[pos++] = c;
1382 }
1383 }
1384 c = getc(stream);
1385 }
1386 if (pos > 0) {
1387 token[pos] = '\0';
1388 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1389 build_jvm_flags(token);
1390 }
1391 fclose(stream);
1392 return result;
1393 }
1394
1395 //=============================================================================================================
1396 // Parsing of properties (-D)
1397
1398 const char* Arguments::get_property(const char* key) {
1399 return PropertyList_get_value(system_properties(), key);
1400 }
1401
1402 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1403 const char* eq = strchr(prop, '=');
1404 const char* key;
1405 const char* value = "";
1406
1407 if (eq == NULL) {
1408 // property doesn't have a value, thus use passed string
1409 key = prop;
1410 } else {
1411 // property have a value, thus extract it and save to the
1412 // allocated string
1413 size_t key_len = eq - prop;
1414 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1415
1416 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1417 key = tmp_key;
1418
1419 value = &prop[key_len + 1];
1420 }
1421
1422 if (strcmp(key, "java.compiler") == 0) {
1423 process_java_compiler_argument(value);
1424 // Record value in Arguments, but let it get passed to Java.
1425 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1426 strcmp(key, "sun.java.launcher.pid") == 0) {
1427 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1428 // private and are processed in process_sun_java_launcher_properties();
1429 // the sun.java.launcher property is passed on to the java application
1430 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1431 // append is true, writable is true, internal is false
1432 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1433 WriteableProperty, ExternalProperty);
1434 } else {
1435 if (strcmp(key, "sun.java.command") == 0) {
1436 char *old_java_command = _java_command;
1437 _java_command = os::strdup_check_oom(value, mtArguments);
1438 if (old_java_command != NULL) {
1439 os::free(old_java_command);
1440 }
1441 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1442 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1443 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1444 // its value without going through the property list or making a Java call.
1445 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1446 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1447 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1448 os::free((void *)old_java_vendor_url_bug);
1449 }
1450 }
1451
1452 // Create new property and add at the end of the list
1453 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1454 }
1455
1456 if (key != prop) {
1457 // SystemProperty copy passed value, thus free previously allocated
1458 // memory
1459 FreeHeap((void *)key);
1460 }
1461
1462 return true;
1463 }
1464
1465 #if INCLUDE_CDS
1466 const char* unsupported_properties[] = { "jdk.module.limitmods",
1467 "jdk.module.upgrade.path",
1468 "jdk.module.patch.0" };
1469 const char* unsupported_options[] = { "--limit-modules",
1470 "--upgrade-module-path",
1471 "--patch-module"
1472 };
1473 void Arguments::check_unsupported_dumping_properties() {
1474 assert(DumpSharedSpaces || DynamicDumpSharedSpaces,
1475 "this function is only used with CDS dump time");
1476 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1477 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1478 SystemProperty* sp = system_properties();
1479 while (sp != NULL) {
1480 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1481 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1482 vm_exit_during_initialization(
1483 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1484 }
1485 }
1486 sp = sp->next();
1487 }
1488
1489 // Check for an exploded module build in use with -Xshare:dump.
1490 if (!has_jimage()) {
1491 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1492 }
1493 }
1494
1495 bool Arguments::check_unsupported_cds_runtime_properties() {
1496 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1497 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1498 if (ArchiveClassesAtExit != NULL) {
1499 // dynamic dumping, just return false for now.
1500 // check_unsupported_dumping_properties() will be called later to check the same set of
1501 // properties, and will exit the VM with the correct error message if the unsupported properties
1502 // are used.
1503 return false;
1504 }
1505 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1506 if (get_property(unsupported_properties[i]) != NULL) {
1507 if (RequireSharedSpaces) {
1508 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1509 }
1510 return true;
1511 }
1512 }
1513 return false;
1514 }
1515 #endif
1516
1517 //===========================================================================================================
1518 // Setting int/mixed/comp mode flags
1519
1520 void Arguments::set_mode_flags(Mode mode) {
1521 // Set up default values for all flags.
1522 // If you add a flag to any of the branches below,
1523 // add a default value for it here.
1524 set_java_compiler(false);
1525 _mode = mode;
1526
1527 // Ensure Agent_OnLoad has the correct initial values.
1528 // This may not be the final mode; mode may change later in onload phase.
1529 PropertyList_unique_add(&_system_properties, "java.vm.info",
1530 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1531
1532 UseInterpreter = true;
1533 UseCompiler = true;
1534 UseLoopCounter = true;
1535
1536 // Default values may be platform/compiler dependent -
1537 // use the saved values
1538 ClipInlining = Arguments::_ClipInlining;
1539 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1540 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1541 BackgroundCompilation = Arguments::_BackgroundCompilation;
1542 if (TieredCompilation) {
1543 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1544 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1545 }
1546 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1547 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1548 }
1549 }
1550
1551 // Change from defaults based on mode
1552 switch (mode) {
1553 default:
1554 ShouldNotReachHere();
1555 break;
1556 case _int:
1557 UseCompiler = false;
1558 UseLoopCounter = false;
1559 AlwaysCompileLoopMethods = false;
1560 UseOnStackReplacement = false;
1561 break;
1562 case _mixed:
1563 // same as default
1564 break;
1565 case _comp:
1566 UseInterpreter = false;
1567 BackgroundCompilation = false;
1568 ClipInlining = false;
1569 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1570 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1571 // compile a level 4 (C2) and then continue executing it.
1572 if (TieredCompilation) {
1573 Tier3InvokeNotifyFreqLog = 0;
1574 Tier4InvocationThreshold = 0;
1575 }
1576 break;
1577 }
1578 }
1579
1580 // Conflict: required to use shared spaces (-Xshare:on), but
1581 // incompatible command line options were chosen.
1582 static void no_shared_spaces(const char* message) {
1583 if (RequireSharedSpaces) {
1584 jio_fprintf(defaultStream::error_stream(),
1585 "Class data sharing is inconsistent with other specified options.\n");
1586 vm_exit_during_initialization("Unable to use shared archive", message);
1587 } else {
1588 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1589 }
1590 }
1591
1592 void set_object_alignment() {
1593 // Object alignment.
1594 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1595 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1596 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1597 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1598 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1599 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1600
1601 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1602 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1603
1604 // Oop encoding heap max
1605 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1606
1607 if (SurvivorAlignmentInBytes == 0) {
1608 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1609 }
1610 }
1611
1612 size_t Arguments::max_heap_for_compressed_oops() {
1613 // Avoid sign flip.
1614 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1615 // We need to fit both the NULL page and the heap into the memory budget, while
1616 // keeping alignment constraints of the heap. To guarantee the latter, as the
1617 // NULL page is located before the heap, we pad the NULL page to the conservative
1618 // maximum alignment that the GC may ever impose upon the heap.
1619 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1620 _conservative_max_heap_alignment);
1621
1622 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1623 NOT_LP64(ShouldNotReachHere(); return 0);
1624 }
1625
1626 void Arguments::set_use_compressed_oops() {
1627 #ifndef ZERO
1628 #ifdef _LP64
1629 // MaxHeapSize is not set up properly at this point, but
1630 // the only value that can override MaxHeapSize if we are
1631 // to use UseCompressedOops is InitialHeapSize.
1632 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1633
1634 if (max_heap_size <= max_heap_for_compressed_oops()) {
1635 #if !defined(COMPILER1) || defined(TIERED)
1636 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1637 FLAG_SET_ERGO(UseCompressedOops, true);
1638 }
1639 #endif
1640 } else {
1641 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1642 warning("Max heap size too large for Compressed Oops");
1643 FLAG_SET_DEFAULT(UseCompressedOops, false);
1644 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1645 }
1646 }
1647 #endif // _LP64
1648 #endif // ZERO
1649 }
1650
1651
1652 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1653 // set_use_compressed_oops().
1654 void Arguments::set_use_compressed_klass_ptrs() {
1655 #ifndef ZERO
1656 #ifdef _LP64
1657 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1658 if (!UseCompressedOops) {
1659 if (UseCompressedClassPointers) {
1660 warning("UseCompressedClassPointers requires UseCompressedOops");
1661 }
1662 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1663 } else {
1664 // Turn on UseCompressedClassPointers too
1665 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1666 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1667 }
1668 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1669 if (UseCompressedClassPointers) {
1670 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1671 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1672 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1673 }
1674 }
1675 }
1676 #endif // _LP64
1677 #endif // !ZERO
1678 }
1679
1680 void Arguments::set_conservative_max_heap_alignment() {
1681 // The conservative maximum required alignment for the heap is the maximum of
1682 // the alignments imposed by several sources: any requirements from the heap
1683 // itself and the maximum page size we may run the VM with.
1684 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1685 _conservative_max_heap_alignment = MAX4(heap_alignment,
1686 (size_t)os::vm_allocation_granularity(),
1687 os::max_page_size(),
1688 GCArguments::compute_heap_alignment());
1689 }
1690
1691 jint Arguments::set_ergonomics_flags() {
1692 GCConfig::initialize();
1693
1694 set_conservative_max_heap_alignment();
1695
1696 #ifndef ZERO
1697 #ifdef _LP64
1698 set_use_compressed_oops();
1699
1700 // set_use_compressed_klass_ptrs() must be called after calling
1701 // set_use_compressed_oops().
1702 set_use_compressed_klass_ptrs();
1703
1704 // Also checks that certain machines are slower with compressed oops
1705 // in vm_version initialization code.
1706 #endif // _LP64
1707 #endif // !ZERO
1708
1709 return JNI_OK;
1710 }
1711
1712 julong Arguments::limit_by_allocatable_memory(julong limit) {
1713 julong max_allocatable;
1714 julong result = limit;
1715 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1716 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1717 }
1718 return result;
1719 }
1720
1721 // Use static initialization to get the default before parsing
1722 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1723
1724 void Arguments::set_heap_size() {
1725 julong phys_mem =
1726 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1727 : (julong)MaxRAM;
1728
1729 // Convert deprecated flags
1730 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1731 !FLAG_IS_DEFAULT(MaxRAMFraction))
1732 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1733
1734 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1735 !FLAG_IS_DEFAULT(MinRAMFraction))
1736 MinRAMPercentage = 100.0 / MinRAMFraction;
1737
1738 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1739 !FLAG_IS_DEFAULT(InitialRAMFraction))
1740 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1741
1742 // If the maximum heap size has not been set with -Xmx,
1743 // then set it as fraction of the size of physical memory,
1744 // respecting the maximum and minimum sizes of the heap.
1745 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1746 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1747 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1748 if (reasonable_min < MaxHeapSize) {
1749 // Small physical memory, so use a minimum fraction of it for the heap
1750 reasonable_max = reasonable_min;
1751 } else {
1752 // Not-small physical memory, so require a heap at least
1753 // as large as MaxHeapSize
1754 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1755 }
1756
1757 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1758 // Limit the heap size to ErgoHeapSizeLimit
1759 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1760 }
1761 if (UseCompressedOops) {
1762 // Limit the heap size to the maximum possible when using compressed oops
1763 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1764
1765 // HeapBaseMinAddress can be greater than default but not less than.
1766 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1767 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1768 // matches compressed oops printing flags
1769 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1770 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1771 DefaultHeapBaseMinAddress,
1772 DefaultHeapBaseMinAddress/G,
1773 HeapBaseMinAddress);
1774 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1775 }
1776 }
1777
1778 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1779 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1780 // but it should be not less than default MaxHeapSize.
1781 max_coop_heap -= HeapBaseMinAddress;
1782 }
1783 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1784 }
1785 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1786
1787 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1788 // An initial heap size was specified on the command line,
1789 // so be sure that the maximum size is consistent. Done
1790 // after call to limit_by_allocatable_memory because that
1791 // method might reduce the allocation size.
1792 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1793 }
1794
1795 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1796 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1797 }
1798
1799 // If the minimum or initial heap_size have not been set or requested to be set
1800 // ergonomically, set them accordingly.
1801 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1802 julong reasonable_minimum = (julong)(OldSize + NewSize);
1803
1804 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1805
1806 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1807
1808 if (InitialHeapSize == 0) {
1809 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1810
1811 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1812 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1813
1814 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1815
1816 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1817 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1818 }
1819 // If the minimum heap size has not been set (via -Xms),
1820 // synchronize with InitialHeapSize to avoid errors with the default value.
1821 if (MinHeapSize == 0) {
1822 MinHeapSize = MIN2((size_t)reasonable_minimum, InitialHeapSize);
1823 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1824 }
1825 }
1826 }
1827
1828 // This option inspects the machine and attempts to set various
1829 // parameters to be optimal for long-running, memory allocation
1830 // intensive jobs. It is intended for machines with large
1831 // amounts of cpu and memory.
1832 jint Arguments::set_aggressive_heap_flags() {
1833 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1834 // VM, but we may not be able to represent the total physical memory
1835 // available (like having 8gb of memory on a box but using a 32bit VM).
1836 // Thus, we need to make sure we're using a julong for intermediate
1837 // calculations.
1838 julong initHeapSize;
1839 julong total_memory = os::physical_memory();
1840
1841 if (total_memory < (julong) 256 * M) {
1842 jio_fprintf(defaultStream::error_stream(),
1843 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1844 vm_exit(1);
1845 }
1846
1847 // The heap size is half of available memory, or (at most)
1848 // all of possible memory less 160mb (leaving room for the OS
1849 // when using ISM). This is the maximum; because adaptive sizing
1850 // is turned on below, the actual space used may be smaller.
1851
1852 initHeapSize = MIN2(total_memory / (julong) 2,
1853 total_memory - (julong) 160 * M);
1854
1855 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1856
1857 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1858 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1859 return JNI_EINVAL;
1860 }
1861 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1862 return JNI_EINVAL;
1863 }
1864 // Currently the minimum size and the initial heap sizes are the same.
1865 MinHeapSize = initHeapSize;
1866 }
1867 if (FLAG_IS_DEFAULT(NewSize)) {
1868 // Make the young generation 3/8ths of the total heap.
1869 if (FLAG_SET_CMDLINE(NewSize,
1870 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1871 return JNI_EINVAL;
1872 }
1873 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1874 return JNI_EINVAL;
1875 }
1876 }
1877
1878 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1879 FLAG_SET_DEFAULT(UseLargePages, true);
1880 #endif
1881
1882 // Increase some data structure sizes for efficiency
1883 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1884 return JNI_EINVAL;
1885 }
1886 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1887 return JNI_EINVAL;
1888 }
1889 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1890 return JNI_EINVAL;
1891 }
1892
1893 // See the OldPLABSize comment below, but replace 'after promotion'
1894 // with 'after copying'. YoungPLABSize is the size of the survivor
1895 // space per-gc-thread buffers. The default is 4kw.
1896 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1897 return JNI_EINVAL;
1898 }
1899
1900 // OldPLABSize is the size of the buffers in the old gen that
1901 // UseParallelGC uses to promote live data that doesn't fit in the
1902 // survivor spaces. At any given time, there's one for each gc thread.
1903 // The default size is 1kw. These buffers are rarely used, since the
1904 // survivor spaces are usually big enough. For specjbb, however, there
1905 // are occasions when there's lots of live data in the young gen
1906 // and we end up promoting some of it. We don't have a definite
1907 // explanation for why bumping OldPLABSize helps, but the theory
1908 // is that a bigger PLAB results in retaining something like the
1909 // original allocation order after promotion, which improves mutator
1910 // locality. A minor effect may be that larger PLABs reduce the
1911 // number of PLAB allocation events during gc. The value of 8kw
1912 // was arrived at by experimenting with specjbb.
1913 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1914 return JNI_EINVAL;
1915 }
1916
1917 // Enable parallel GC and adaptive generation sizing
1918 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1919 return JNI_EINVAL;
1920 }
1921
1922 // Encourage steady state memory management
1923 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1924 return JNI_EINVAL;
1925 }
1926
1927 // This appears to improve mutator locality
1928 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1929 return JNI_EINVAL;
1930 }
1931
1932 // Get around early Solaris scheduling bug
1933 // (affinity vs other jobs on system)
1934 // but disallow DR and offlining (5008695).
1935 if (FLAG_SET_CMDLINE(BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1936 return JNI_EINVAL;
1937 }
1938
1939 return JNI_OK;
1940 }
1941
1942 // This must be called after ergonomics.
1943 void Arguments::set_bytecode_flags() {
1944 if (!RewriteBytecodes) {
1945 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1946 }
1947 }
1948
1949 // Aggressive optimization flags
1950 jint Arguments::set_aggressive_opts_flags() {
1951 #ifdef COMPILER2
1952 if (AggressiveUnboxing) {
1953 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1954 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1955 } else if (!EliminateAutoBox) {
1956 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1957 AggressiveUnboxing = false;
1958 }
1959 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1960 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1961 } else if (!DoEscapeAnalysis) {
1962 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1963 AggressiveUnboxing = false;
1964 }
1965 }
1966 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1967 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1968 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1969 }
1970 // Feed the cache size setting into the JDK
1971 char buffer[1024];
1972 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1973 if (!add_property(buffer)) {
1974 return JNI_ENOMEM;
1975 }
1976 }
1977 #endif
1978
1979 return JNI_OK;
1980 }
1981
1982 //===========================================================================================================
1983 // Parsing of java.compiler property
1984
1985 void Arguments::process_java_compiler_argument(const char* arg) {
1986 // For backwards compatibility, Djava.compiler=NONE or ""
1987 // causes us to switch to -Xint mode UNLESS -Xdebug
1988 // is also specified.
1989 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1990 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1991 }
1992 }
1993
1994 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1995 _sun_java_launcher = os::strdup_check_oom(launcher);
1996 }
1997
1998 bool Arguments::created_by_java_launcher() {
1999 assert(_sun_java_launcher != NULL, "property must have value");
2000 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2001 }
2002
2003 bool Arguments::sun_java_launcher_is_altjvm() {
2004 return _sun_java_launcher_is_altjvm;
2005 }
2006
2007 //===========================================================================================================
2008 // Parsing of main arguments
2009
2010 unsigned int addreads_count = 0;
2011 unsigned int addexports_count = 0;
2012 unsigned int addopens_count = 0;
2013 unsigned int addmods_count = 0;
2014 unsigned int patch_mod_count = 0;
2015
2016 // Check the consistency of vm_init_args
2017 bool Arguments::check_vm_args_consistency() {
2018 // Method for adding checks for flag consistency.
2019 // The intent is to warn the user of all possible conflicts,
2020 // before returning an error.
2021 // Note: Needs platform-dependent factoring.
2022 bool status = true;
2023
2024 if (TLABRefillWasteFraction == 0) {
2025 jio_fprintf(defaultStream::error_stream(),
2026 "TLABRefillWasteFraction should be a denominator, "
2027 "not " SIZE_FORMAT "\n",
2028 TLABRefillWasteFraction);
2029 status = false;
2030 }
2031
2032 if (PrintNMTStatistics) {
2033 #if INCLUDE_NMT
2034 if (MemTracker::tracking_level() == NMT_off) {
2035 #endif // INCLUDE_NMT
2036 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2037 PrintNMTStatistics = false;
2038 #if INCLUDE_NMT
2039 }
2040 #endif
2041 }
2042
2043 status = CompilerConfig::check_args_consistency(status);
2044 #if INCLUDE_JVMCI
2045 if (status && EnableJVMCI) {
2046 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2047 AddProperty, UnwriteableProperty, InternalProperty);
2048 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2049 return false;
2050 }
2051 }
2052 #endif
2053
2054 #ifndef SUPPORT_RESERVED_STACK_AREA
2055 if (StackReservedPages != 0) {
2056 FLAG_SET_CMDLINE(StackReservedPages, 0);
2057 warning("Reserved Stack Area not supported on this platform");
2058 }
2059 #endif
2060
2061 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2062 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2063 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2064 }
2065 }
2066
2067 status = status && GCArguments::check_args_consistency();
2068
2069 return status;
2070 }
2071
2072 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2073 const char* option_type) {
2074 if (ignore) return false;
2075
2076 const char* spacer = " ";
2077 if (option_type == NULL) {
2078 option_type = ++spacer; // Set both to the empty string.
2079 }
2080
2081 jio_fprintf(defaultStream::error_stream(),
2082 "Unrecognized %s%soption: %s\n", option_type, spacer,
2083 option->optionString);
2084 return true;
2085 }
2086
2087 static const char* user_assertion_options[] = {
2088 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2089 };
2090
2091 static const char* system_assertion_options[] = {
2092 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2093 };
2094
2095 bool Arguments::parse_uintx(const char* value,
2096 uintx* uintx_arg,
2097 uintx min_size) {
2098
2099 // Check the sign first since atojulong() parses only unsigned values.
2100 bool value_is_positive = !(*value == '-');
2101
2102 if (value_is_positive) {
2103 julong n;
2104 bool good_return = atojulong(value, &n);
2105 if (good_return) {
2106 bool above_minimum = n >= min_size;
2107 bool value_is_too_large = n > max_uintx;
2108
2109 if (above_minimum && !value_is_too_large) {
2110 *uintx_arg = n;
2111 return true;
2112 }
2113 }
2114 }
2115 return false;
2116 }
2117
2118 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2119 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2120 char* property = AllocateHeap(prop_len, mtArguments);
2121 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2122 if (ret < 0 || ret >= (int)prop_len) {
2123 FreeHeap(property);
2124 return false;
2125 }
2126 bool added = add_property(property, UnwriteableProperty, internal);
2127 FreeHeap(property);
2128 return added;
2129 }
2130
2131 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2132 const unsigned int props_count_limit = 1000;
2133 const int max_digits = 3;
2134 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2135
2136 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2137 if (count < props_count_limit) {
2138 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2139 char* property = AllocateHeap(prop_len, mtArguments);
2140 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2141 if (ret < 0 || ret >= (int)prop_len) {
2142 FreeHeap(property);
2143 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2144 return false;
2145 }
2146 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2147 FreeHeap(property);
2148 return added;
2149 }
2150
2151 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2152 return false;
2153 }
2154
2155 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2156 julong* long_arg,
2157 julong min_size,
2158 julong max_size) {
2159 if (!atojulong(s, long_arg)) return arg_unreadable;
2160 return check_memory_size(*long_arg, min_size, max_size);
2161 }
2162
2163 // Parse JavaVMInitArgs structure
2164
2165 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2166 const JavaVMInitArgs *java_options_args,
2167 const JavaVMInitArgs *cmd_line_args) {
2168 bool patch_mod_javabase = false;
2169
2170 // Save default settings for some mode flags
2171 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2172 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2173 Arguments::_ClipInlining = ClipInlining;
2174 Arguments::_BackgroundCompilation = BackgroundCompilation;
2175 if (TieredCompilation) {
2176 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2177 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2178 }
2179
2180 // Setup flags for mixed which is the default
2181 set_mode_flags(_mixed);
2182
2183 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2184 // variable (if present).
2185 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2186 if (result != JNI_OK) {
2187 return result;
2188 }
2189
2190 // Parse args structure generated from the command line flags.
2191 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2192 if (result != JNI_OK) {
2193 return result;
2194 }
2195
2196 // Parse args structure generated from the _JAVA_OPTIONS environment
2197 // variable (if present) (mimics classic VM)
2198 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2199 if (result != JNI_OK) {
2200 return result;
2201 }
2202
2203 // We need to ensure processor and memory resources have been properly
2204 // configured - which may rely on arguments we just processed - before
2205 // doing the final argument processing. Any argument processing that
2206 // needs to know about processor and memory resources must occur after
2207 // this point.
2208
2209 os::init_container_support();
2210
2211 // Do final processing now that all arguments have been parsed
2212 result = finalize_vm_init_args(patch_mod_javabase);
2213 if (result != JNI_OK) {
2214 return result;
2215 }
2216
2217 return JNI_OK;
2218 }
2219
2220 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2221 // represents a valid JDWP agent. is_path==true denotes that we
2222 // are dealing with -agentpath (case where name is a path), otherwise with
2223 // -agentlib
2224 bool valid_jdwp_agent(char *name, bool is_path) {
2225 char *_name;
2226 const char *_jdwp = "jdwp";
2227 size_t _len_jdwp, _len_prefix;
2228
2229 if (is_path) {
2230 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2231 return false;
2232 }
2233
2234 _name++; // skip past last path separator
2235 _len_prefix = strlen(JNI_LIB_PREFIX);
2236
2237 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2238 return false;
2239 }
2240
2241 _name += _len_prefix;
2242 _len_jdwp = strlen(_jdwp);
2243
2244 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2245 _name += _len_jdwp;
2246 }
2247 else {
2248 return false;
2249 }
2250
2251 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2252 return false;
2253 }
2254
2255 return true;
2256 }
2257
2258 if (strcmp(name, _jdwp) == 0) {
2259 return true;
2260 }
2261
2262 return false;
2263 }
2264
2265 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2266 // --patch-module=<module>=<file>(<pathsep><file>)*
2267 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2268 // Find the equal sign between the module name and the path specification
2269 const char* module_equal = strchr(patch_mod_tail, '=');
2270 if (module_equal == NULL) {
2271 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2272 return JNI_ERR;
2273 } else {
2274 // Pick out the module name
2275 size_t module_len = module_equal - patch_mod_tail;
2276 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2277 if (module_name != NULL) {
2278 memcpy(module_name, patch_mod_tail, module_len);
2279 *(module_name + module_len) = '\0';
2280 // The path piece begins one past the module_equal sign
2281 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2282 FREE_C_HEAP_ARRAY(char, module_name);
2283 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2284 return JNI_ENOMEM;
2285 }
2286 } else {
2287 return JNI_ENOMEM;
2288 }
2289 }
2290 return JNI_OK;
2291 }
2292
2293 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2294 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2295 // The min and max sizes match the values in globals.hpp, but scaled
2296 // with K. The values have been chosen so that alignment with page
2297 // size doesn't change the max value, which makes the conversions
2298 // back and forth between Xss value and ThreadStackSize value easier.
2299 // The values have also been chosen to fit inside a 32-bit signed type.
2300 const julong min_ThreadStackSize = 0;
2301 const julong max_ThreadStackSize = 1 * M;
2302
2303 const julong min_size = min_ThreadStackSize * K;
2304 const julong max_size = max_ThreadStackSize * K;
2305
2306 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2307
2308 julong size = 0;
2309 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2310 if (errcode != arg_in_range) {
2311 bool silent = (option == NULL); // Allow testing to silence error messages
2312 if (!silent) {
2313 jio_fprintf(defaultStream::error_stream(),
2314 "Invalid thread stack size: %s\n", option->optionString);
2315 describe_range_error(errcode);
2316 }
2317 return JNI_EINVAL;
2318 }
2319
2320 // Internally track ThreadStackSize in units of 1024 bytes.
2321 const julong size_aligned = align_up(size, K);
2322 assert(size <= size_aligned,
2323 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2324 size, size_aligned);
2325
2326 const julong size_in_K = size_aligned / K;
2327 assert(size_in_K < (julong)max_intx,
2328 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2329 size_in_K);
2330
2331 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2332 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2333 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2334 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2335 max_expanded, size_in_K);
2336
2337 *out_ThreadStackSize = (intx)size_in_K;
2338
2339 return JNI_OK;
2340 }
2341
2342 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2343 // For match_option to return remaining or value part of option string
2344 const char* tail;
2345
2346 // iterate over arguments
2347 for (int index = 0; index < args->nOptions; index++) {
2348 bool is_absolute_path = false; // for -agentpath vs -agentlib
2349
2350 const JavaVMOption* option = args->options + index;
2351
2352 if (!match_option(option, "-Djava.class.path", &tail) &&
2353 !match_option(option, "-Dsun.java.command", &tail) &&
2354 !match_option(option, "-Dsun.java.launcher", &tail)) {
2355
2356 // add all jvm options to the jvm_args string. This string
2357 // is used later to set the java.vm.args PerfData string constant.
2358 // the -Djava.class.path and the -Dsun.java.command options are
2359 // omitted from jvm_args string as each have their own PerfData
2360 // string constant object.
2361 build_jvm_args(option->optionString);
2362 }
2363
2364 // -verbose:[class/module/gc/jni]
2365 if (match_option(option, "-verbose", &tail)) {
2366 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2367 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2368 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2369 } else if (!strcmp(tail, ":module")) {
2370 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2371 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2372 } else if (!strcmp(tail, ":gc")) {
2373 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2374 } else if (!strcmp(tail, ":jni")) {
2375 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2376 return JNI_EINVAL;
2377 }
2378 }
2379 // -da / -ea / -disableassertions / -enableassertions
2380 // These accept an optional class/package name separated by a colon, e.g.,
2381 // -da:java.lang.Thread.
2382 } else if (match_option(option, user_assertion_options, &tail, true)) {
2383 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2384 if (*tail == '\0') {
2385 JavaAssertions::setUserClassDefault(enable);
2386 } else {
2387 assert(*tail == ':', "bogus match by match_option()");
2388 JavaAssertions::addOption(tail + 1, enable);
2389 }
2390 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2391 } else if (match_option(option, system_assertion_options, &tail, false)) {
2392 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2393 JavaAssertions::setSystemClassDefault(enable);
2394 // -bootclasspath:
2395 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2396 jio_fprintf(defaultStream::output_stream(),
2397 "-Xbootclasspath is no longer a supported option.\n");
2398 return JNI_EINVAL;
2399 // -bootclasspath/a:
2400 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2401 Arguments::append_sysclasspath(tail);
2402 // -bootclasspath/p:
2403 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2404 jio_fprintf(defaultStream::output_stream(),
2405 "-Xbootclasspath/p is no longer a supported option.\n");
2406 return JNI_EINVAL;
2407 // -Xrun
2408 } else if (match_option(option, "-Xrun", &tail)) {
2409 if (tail != NULL) {
2410 const char* pos = strchr(tail, ':');
2411 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2412 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2413 jio_snprintf(name, len + 1, "%s", tail);
2414
2415 char *options = NULL;
2416 if(pos != NULL) {
2417 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2418 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2419 }
2420 #if !INCLUDE_JVMTI
2421 if (strcmp(name, "jdwp") == 0) {
2422 jio_fprintf(defaultStream::error_stream(),
2423 "Debugging agents are not supported in this VM\n");
2424 return JNI_ERR;
2425 }
2426 #endif // !INCLUDE_JVMTI
2427 add_init_library(name, options);
2428 }
2429 } else if (match_option(option, "--add-reads=", &tail)) {
2430 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2431 return JNI_ENOMEM;
2432 }
2433 } else if (match_option(option, "--add-exports=", &tail)) {
2434 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2435 return JNI_ENOMEM;
2436 }
2437 } else if (match_option(option, "--add-opens=", &tail)) {
2438 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2439 return JNI_ENOMEM;
2440 }
2441 } else if (match_option(option, "--add-modules=", &tail)) {
2442 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2443 return JNI_ENOMEM;
2444 }
2445 } else if (match_option(option, "--limit-modules=", &tail)) {
2446 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2447 return JNI_ENOMEM;
2448 }
2449 } else if (match_option(option, "--module-path=", &tail)) {
2450 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2451 return JNI_ENOMEM;
2452 }
2453 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2454 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2455 return JNI_ENOMEM;
2456 }
2457 } else if (match_option(option, "--patch-module=", &tail)) {
2458 // --patch-module=<module>=<file>(<pathsep><file>)*
2459 int res = process_patch_mod_option(tail, patch_mod_javabase);
2460 if (res != JNI_OK) {
2461 return res;
2462 }
2463 } else if (match_option(option, "--illegal-access=", &tail)) {
2464 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2465 return JNI_ENOMEM;
2466 }
2467 // -agentlib and -agentpath
2468 } else if (match_option(option, "-agentlib:", &tail) ||
2469 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2470 if(tail != NULL) {
2471 const char* pos = strchr(tail, '=');
2472 char* name;
2473 if (pos == NULL) {
2474 name = os::strdup_check_oom(tail, mtArguments);
2475 } else {
2476 size_t len = pos - tail;
2477 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2478 memcpy(name, tail, len);
2479 name[len] = '\0';
2480 }
2481
2482 char *options = NULL;
2483 if(pos != NULL) {
2484 options = os::strdup_check_oom(pos + 1, mtArguments);
2485 }
2486 #if !INCLUDE_JVMTI
2487 if (valid_jdwp_agent(name, is_absolute_path)) {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Debugging agents are not supported in this VM\n");
2490 return JNI_ERR;
2491 }
2492 #endif // !INCLUDE_JVMTI
2493 add_init_agent(name, options, is_absolute_path);
2494 }
2495 // -javaagent
2496 } else if (match_option(option, "-javaagent:", &tail)) {
2497 #if !INCLUDE_JVMTI
2498 jio_fprintf(defaultStream::error_stream(),
2499 "Instrumentation agents are not supported in this VM\n");
2500 return JNI_ERR;
2501 #else
2502 if (tail != NULL) {
2503 size_t length = strlen(tail) + 1;
2504 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2505 jio_snprintf(options, length, "%s", tail);
2506 add_instrument_agent("instrument", options, false);
2507 // java agents need module java.instrument
2508 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2509 return JNI_ENOMEM;
2510 }
2511 }
2512 #endif // !INCLUDE_JVMTI
2513 // --enable_preview
2514 } else if (match_option(option, "--enable-preview")) {
2515 set_enable_preview();
2516 // -Xnoclassgc
2517 } else if (match_option(option, "-Xnoclassgc")) {
2518 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2519 return JNI_EINVAL;
2520 }
2521 // -Xconcgc
2522 } else if (match_option(option, "-Xconcgc")) {
2523 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2524 return JNI_EINVAL;
2525 }
2526 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2527 // -Xnoconcgc
2528 } else if (match_option(option, "-Xnoconcgc")) {
2529 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2530 return JNI_EINVAL;
2531 }
2532 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2533 // -Xbatch
2534 } else if (match_option(option, "-Xbatch")) {
2535 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2536 return JNI_EINVAL;
2537 }
2538 // -Xmn for compatibility with other JVM vendors
2539 } else if (match_option(option, "-Xmn", &tail)) {
2540 julong long_initial_young_size = 0;
2541 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2542 if (errcode != arg_in_range) {
2543 jio_fprintf(defaultStream::error_stream(),
2544 "Invalid initial young generation size: %s\n", option->optionString);
2545 describe_range_error(errcode);
2546 return JNI_EINVAL;
2547 }
2548 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2549 return JNI_EINVAL;
2550 }
2551 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2552 return JNI_EINVAL;
2553 }
2554 // -Xms
2555 } else if (match_option(option, "-Xms", &tail)) {
2556 julong long_initial_heap_size = 0;
2557 // an initial heap size of 0 means automatically determine
2558 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2559 if (errcode != arg_in_range) {
2560 jio_fprintf(defaultStream::error_stream(),
2561 "Invalid initial heap size: %s\n", option->optionString);
2562 describe_range_error(errcode);
2563 return JNI_EINVAL;
2564 }
2565 MinHeapSize = (size_t)long_initial_heap_size;
2566 // Currently the minimum size and the initial heap sizes are the same.
2567 // Can be overridden with -XX:InitialHeapSize.
2568 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2569 return JNI_EINVAL;
2570 }
2571 // -Xmx
2572 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2573 julong long_max_heap_size = 0;
2574 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2575 if (errcode != arg_in_range) {
2576 jio_fprintf(defaultStream::error_stream(),
2577 "Invalid maximum heap size: %s\n", option->optionString);
2578 describe_range_error(errcode);
2579 return JNI_EINVAL;
2580 }
2581 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2582 return JNI_EINVAL;
2583 }
2584 // Xmaxf
2585 } else if (match_option(option, "-Xmaxf", &tail)) {
2586 char* err;
2587 int maxf = (int)(strtod(tail, &err) * 100);
2588 if (*err != '\0' || *tail == '\0') {
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Bad max heap free percentage size: %s\n",
2591 option->optionString);
2592 return JNI_EINVAL;
2593 } else {
2594 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2595 return JNI_EINVAL;
2596 }
2597 }
2598 // Xminf
2599 } else if (match_option(option, "-Xminf", &tail)) {
2600 char* err;
2601 int minf = (int)(strtod(tail, &err) * 100);
2602 if (*err != '\0' || *tail == '\0') {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Bad min heap free percentage size: %s\n",
2605 option->optionString);
2606 return JNI_EINVAL;
2607 } else {
2608 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2609 return JNI_EINVAL;
2610 }
2611 }
2612 // -Xss
2613 } else if (match_option(option, "-Xss", &tail)) {
2614 intx value = 0;
2615 jint err = parse_xss(option, tail, &value);
2616 if (err != JNI_OK) {
2617 return err;
2618 }
2619 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2620 return JNI_EINVAL;
2621 }
2622 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2623 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2624 julong long_ReservedCodeCacheSize = 0;
2625
2626 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2627 if (errcode != arg_in_range) {
2628 jio_fprintf(defaultStream::error_stream(),
2629 "Invalid maximum code cache size: %s.\n", option->optionString);
2630 return JNI_EINVAL;
2631 }
2632 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2633 return JNI_EINVAL;
2634 }
2635 // -green
2636 } else if (match_option(option, "-green")) {
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Green threads support not available\n");
2639 return JNI_EINVAL;
2640 // -native
2641 } else if (match_option(option, "-native")) {
2642 // HotSpot always uses native threads, ignore silently for compatibility
2643 // -Xrs
2644 } else if (match_option(option, "-Xrs")) {
2645 // Classic/EVM option, new functionality
2646 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 // -Xprof
2650 } else if (match_option(option, "-Xprof")) {
2651 char version[256];
2652 // Obsolete in JDK 10
2653 JDK_Version::jdk(10).to_string(version, sizeof(version));
2654 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2655 // -Xinternalversion
2656 } else if (match_option(option, "-Xinternalversion")) {
2657 jio_fprintf(defaultStream::output_stream(), "%s\n",
2658 VM_Version::internal_vm_info_string());
2659 vm_exit(0);
2660 #ifndef PRODUCT
2661 // -Xprintflags
2662 } else if (match_option(option, "-Xprintflags")) {
2663 JVMFlag::printFlags(tty, false);
2664 vm_exit(0);
2665 #endif
2666 // -D
2667 } else if (match_option(option, "-D", &tail)) {
2668 const char* value;
2669 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2670 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2671 // abort if -Djava.endorsed.dirs is set
2672 jio_fprintf(defaultStream::output_stream(),
2673 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2674 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2675 return JNI_EINVAL;
2676 }
2677 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2678 *value != '\0' && strcmp(value, "\"\"") != 0) {
2679 // abort if -Djava.ext.dirs is set
2680 jio_fprintf(defaultStream::output_stream(),
2681 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2682 return JNI_EINVAL;
2683 }
2684 // Check for module related properties. They must be set using the modules
2685 // options. For example: use "--add-modules=java.sql", not
2686 // "-Djdk.module.addmods=java.sql"
2687 if (is_internal_module_property(option->optionString + 2)) {
2688 needs_module_property_warning = true;
2689 continue;
2690 }
2691
2692 if (!add_property(tail)) {
2693 return JNI_ENOMEM;
2694 }
2695 // Out of the box management support
2696 if (match_option(option, "-Dcom.sun.management", &tail)) {
2697 #if INCLUDE_MANAGEMENT
2698 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 // management agent in module jdk.management.agent
2702 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2703 return JNI_ENOMEM;
2704 }
2705 #else
2706 jio_fprintf(defaultStream::output_stream(),
2707 "-Dcom.sun.management is not supported in this VM.\n");
2708 return JNI_ERR;
2709 #endif
2710 }
2711 // -Xint
2712 } else if (match_option(option, "-Xint")) {
2713 set_mode_flags(_int);
2714 // -Xmixed
2715 } else if (match_option(option, "-Xmixed")) {
2716 set_mode_flags(_mixed);
2717 // -Xcomp
2718 } else if (match_option(option, "-Xcomp")) {
2719 // for testing the compiler; turn off all flags that inhibit compilation
2720 set_mode_flags(_comp);
2721 // -Xshare:dump
2722 } else if (match_option(option, "-Xshare:dump")) {
2723 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 // -Xshare:on
2727 } else if (match_option(option, "-Xshare:on")) {
2728 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2735 } else if (match_option(option, "-Xshare:auto")) {
2736 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 // -Xshare:off
2743 } else if (match_option(option, "-Xshare:off")) {
2744 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2748 return JNI_EINVAL;
2749 }
2750 // -Xverify
2751 } else if (match_option(option, "-Xverify", &tail)) {
2752 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2753 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 } else if (strcmp(tail, ":remote") == 0) {
2760 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 } else if (strcmp(tail, ":none") == 0) {
2767 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2774 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2775 return JNI_EINVAL;
2776 }
2777 // -Xdebug
2778 } else if (match_option(option, "-Xdebug")) {
2779 // note this flag has been used, then ignore
2780 set_xdebug_mode(true);
2781 // -Xnoagent
2782 } else if (match_option(option, "-Xnoagent")) {
2783 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2784 } else if (match_option(option, "-Xloggc:", &tail)) {
2785 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2786 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2787 _gc_log_filename = os::strdup_check_oom(tail);
2788 } else if (match_option(option, "-Xlog", &tail)) {
2789 bool ret = false;
2790 if (strcmp(tail, ":help") == 0) {
2791 fileStream stream(defaultStream::output_stream());
2792 LogConfiguration::print_command_line_help(&stream);
2793 vm_exit(0);
2794 } else if (strcmp(tail, ":disable") == 0) {
2795 LogConfiguration::disable_logging();
2796 ret = true;
2797 } else if (*tail == '\0') {
2798 ret = LogConfiguration::parse_command_line_arguments();
2799 assert(ret, "-Xlog without arguments should never fail to parse");
2800 } else if (*tail == ':') {
2801 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2802 }
2803 if (ret == false) {
2804 jio_fprintf(defaultStream::error_stream(),
2805 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2806 tail);
2807 return JNI_EINVAL;
2808 }
2809 // JNI hooks
2810 } else if (match_option(option, "-Xcheck", &tail)) {
2811 if (!strcmp(tail, ":jni")) {
2812 #if !INCLUDE_JNI_CHECK
2813 warning("JNI CHECKING is not supported in this VM");
2814 #else
2815 CheckJNICalls = true;
2816 #endif // INCLUDE_JNI_CHECK
2817 } else if (is_bad_option(option, args->ignoreUnrecognized,
2818 "check")) {
2819 return JNI_EINVAL;
2820 }
2821 } else if (match_option(option, "vfprintf")) {
2822 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2823 } else if (match_option(option, "exit")) {
2824 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2825 } else if (match_option(option, "abort")) {
2826 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2827 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2828 // and the last option wins.
2829 } else if (match_option(option, "-XX:+NeverTenure")) {
2830 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2834 return JNI_EINVAL;
2835 }
2836 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2837 return JNI_EINVAL;
2838 }
2839 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2840 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2841 return JNI_EINVAL;
2842 }
2843 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2844 return JNI_EINVAL;
2845 }
2846 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2847 return JNI_EINVAL;
2848 }
2849 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2850 uintx max_tenuring_thresh = 0;
2851 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2854 return JNI_EINVAL;
2855 }
2856
2857 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2858 return JNI_EINVAL;
2859 }
2860
2861 if (MaxTenuringThreshold == 0) {
2862 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2866 return JNI_EINVAL;
2867 }
2868 } else {
2869 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2870 return JNI_EINVAL;
2871 }
2872 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 }
2876 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2877 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2884 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2891 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2895 return JNI_EINVAL;
2896 }
2897 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2898 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2899 return JNI_EINVAL;
2900 }
2901 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2902 return JNI_EINVAL;
2903 }
2904 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2905 #if defined(DTRACE_ENABLED)
2906 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2910 return JNI_EINVAL;
2911 }
2912 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2913 return JNI_EINVAL;
2914 }
2915 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2916 return JNI_EINVAL;
2917 }
2918 #else // defined(DTRACE_ENABLED)
2919 jio_fprintf(defaultStream::error_stream(),
2920 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2921 return JNI_EINVAL;
2922 #endif // defined(DTRACE_ENABLED)
2923 #ifdef ASSERT
2924 } else if (match_option(option, "-XX:+FullGCALot")) {
2925 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 // disable scavenge before parallel mark-compact
2929 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 #endif
2933 #if !INCLUDE_MANAGEMENT
2934 } else if (match_option(option, "-XX:+ManagementServer")) {
2935 jio_fprintf(defaultStream::error_stream(),
2936 "ManagementServer is not supported in this VM.\n");
2937 return JNI_ERR;
2938 #endif // INCLUDE_MANAGEMENT
2939 #if INCLUDE_JFR
2940 } else if (match_jfr_option(&option)) {
2941 return JNI_EINVAL;
2942 #endif
2943 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2944 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2945 // already been handled
2946 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2947 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2948 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2949 return JNI_EINVAL;
2950 }
2951 }
2952 // Unknown option
2953 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2954 return JNI_ERR;
2955 }
2956 }
2957
2958 // PrintSharedArchiveAndExit will turn on
2959 // -Xshare:on
2960 // -Xlog:class+path=info
2961 if (PrintSharedArchiveAndExit) {
2962 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2966 return JNI_EINVAL;
2967 }
2968 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2969 }
2970
2971 fix_appclasspath();
2972
2973 return JNI_OK;
2974 }
2975
2976 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2977 // For java.base check for duplicate --patch-module options being specified on the command line.
2978 // This check is only required for java.base, all other duplicate module specifications
2979 // will be checked during module system initialization. The module system initialization
2980 // will throw an ExceptionInInitializerError if this situation occurs.
2981 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2982 if (*patch_mod_javabase) {
2983 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2984 } else {
2985 *patch_mod_javabase = true;
2986 }
2987 }
2988
2989 // Create GrowableArray lazily, only if --patch-module has been specified
2990 if (_patch_mod_prefix == NULL) {
2991 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
2992 }
2993
2994 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2995 }
2996
2997 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2998 //
2999 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3000 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3001 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3002 // path is treated as the current directory.
3003 //
3004 // This causes problems with CDS, which requires that all directories specified in the classpath
3005 // must be empty. In most cases, applications do NOT want to load classes from the current
3006 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3007 // scripts compatible with CDS.
3008 void Arguments::fix_appclasspath() {
3009 if (IgnoreEmptyClassPaths) {
3010 const char separator = *os::path_separator();
3011 const char* src = _java_class_path->value();
3012
3013 // skip over all the leading empty paths
3014 while (*src == separator) {
3015 src ++;
3016 }
3017
3018 char* copy = os::strdup_check_oom(src, mtArguments);
3019
3020 // trim all trailing empty paths
3021 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3022 *tail = '\0';
3023 }
3024
3025 char from[3] = {separator, separator, '\0'};
3026 char to [2] = {separator, '\0'};
3027 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3028 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3029 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3030 }
3031
3032 _java_class_path->set_writeable_value(copy);
3033 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3034 }
3035 }
3036
3037 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3038 // check if the default lib/endorsed directory exists; if so, error
3039 char path[JVM_MAXPATHLEN];
3040 const char* fileSep = os::file_separator();
3041 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3042
3043 DIR* dir = os::opendir(path);
3044 if (dir != NULL) {
3045 jio_fprintf(defaultStream::output_stream(),
3046 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3047 "in modular form will be supported via the concept of upgradeable modules.\n");
3048 os::closedir(dir);
3049 return JNI_ERR;
3050 }
3051
3052 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3053 dir = os::opendir(path);
3054 if (dir != NULL) {
3055 jio_fprintf(defaultStream::output_stream(),
3056 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3057 "Use -classpath instead.\n.");
3058 os::closedir(dir);
3059 return JNI_ERR;
3060 }
3061
3062 // This must be done after all arguments have been processed
3063 // and the container support has been initialized since AggressiveHeap
3064 // relies on the amount of total memory available.
3065 if (AggressiveHeap) {
3066 jint result = set_aggressive_heap_flags();
3067 if (result != JNI_OK) {
3068 return result;
3069 }
3070 }
3071
3072 // This must be done after all arguments have been processed.
3073 // java_compiler() true means set to "NONE" or empty.
3074 if (java_compiler() && !xdebug_mode()) {
3075 // For backwards compatibility, we switch to interpreted mode if
3076 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3077 // not specified.
3078 set_mode_flags(_int);
3079 }
3080
3081 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3082 // but like -Xint, leave compilation thresholds unaffected.
3083 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3084 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3085 set_mode_flags(_int);
3086 }
3087
3088 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3089 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3090 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3091 }
3092
3093 #if !COMPILER2_OR_JVMCI
3094 // Don't degrade server performance for footprint
3095 if (FLAG_IS_DEFAULT(UseLargePages) &&
3096 MaxHeapSize < LargePageHeapSizeThreshold) {
3097 // No need for large granularity pages w/small heaps.
3098 // Note that large pages are enabled/disabled for both the
3099 // Java heap and the code cache.
3100 FLAG_SET_DEFAULT(UseLargePages, false);
3101 }
3102
3103 UNSUPPORTED_OPTION(ProfileInterpreter);
3104 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3105 #endif
3106
3107 #ifndef TIERED
3108 // Tiered compilation is undefined.
3109 UNSUPPORTED_OPTION(TieredCompilation);
3110 #endif
3111
3112 if (!check_vm_args_consistency()) {
3113 return JNI_ERR;
3114 }
3115
3116 #if INCLUDE_CDS
3117 if (DumpSharedSpaces) {
3118 // Disable biased locking now as it interferes with the clean up of
3119 // the archived Klasses and Java string objects (at dump time only).
3120 UseBiasedLocking = false;
3121
3122 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3123 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3124 // compiler just to be safe.
3125 //
3126 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3127 // instead of modifying them in place. The copy is inaccessible to the compiler.
3128 // TODO: revisit the following for the static archive case.
3129 set_mode_flags(_int);
3130 }
3131 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3132 // Always verify non-system classes during CDS dump
3133 if (!BytecodeVerificationRemote) {
3134 BytecodeVerificationRemote = true;
3135 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3136 }
3137 }
3138 if (ArchiveClassesAtExit == NULL) {
3139 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3140 }
3141 if (UseSharedSpaces && patch_mod_javabase) {
3142 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3143 }
3144 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3145 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3146 }
3147 #endif
3148
3149 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3150 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3151 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3152
3153 return JNI_OK;
3154 }
3155
3156 // Helper class for controlling the lifetime of JavaVMInitArgs
3157 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3158 // deleted on the destruction of the ScopedVMInitArgs object.
3159 class ScopedVMInitArgs : public StackObj {
3160 private:
3161 JavaVMInitArgs _args;
3162 char* _container_name;
3163 bool _is_set;
3164 char* _vm_options_file_arg;
3165
3166 public:
3167 ScopedVMInitArgs(const char *container_name) {
3168 _args.version = JNI_VERSION_1_2;
3169 _args.nOptions = 0;
3170 _args.options = NULL;
3171 _args.ignoreUnrecognized = false;
3172 _container_name = (char *)container_name;
3173 _is_set = false;
3174 _vm_options_file_arg = NULL;
3175 }
3176
3177 // Populates the JavaVMInitArgs object represented by this
3178 // ScopedVMInitArgs object with the arguments in options. The
3179 // allocated memory is deleted by the destructor. If this method
3180 // returns anything other than JNI_OK, then this object is in a
3181 // partially constructed state, and should be abandoned.
3182 jint set_args(GrowableArray<JavaVMOption>* options) {
3183 _is_set = true;
3184 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3185 JavaVMOption, options->length(), mtArguments);
3186 if (options_arr == NULL) {
3187 return JNI_ENOMEM;
3188 }
3189 _args.options = options_arr;
3190
3191 for (int i = 0; i < options->length(); i++) {
3192 options_arr[i] = options->at(i);
3193 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3194 if (options_arr[i].optionString == NULL) {
3195 // Rely on the destructor to do cleanup.
3196 _args.nOptions = i;
3197 return JNI_ENOMEM;
3198 }
3199 }
3200
3201 _args.nOptions = options->length();
3202 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3203 return JNI_OK;
3204 }
3205
3206 JavaVMInitArgs* get() { return &_args; }
3207 char* container_name() { return _container_name; }
3208 bool is_set() { return _is_set; }
3209 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3210 char* vm_options_file_arg() { return _vm_options_file_arg; }
3211
3212 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3213 if (_vm_options_file_arg != NULL) {
3214 os::free(_vm_options_file_arg);
3215 }
3216 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3217 }
3218
3219 ~ScopedVMInitArgs() {
3220 if (_vm_options_file_arg != NULL) {
3221 os::free(_vm_options_file_arg);
3222 }
3223 if (_args.options == NULL) return;
3224 for (int i = 0; i < _args.nOptions; i++) {
3225 os::free(_args.options[i].optionString);
3226 }
3227 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3228 }
3229
3230 // Insert options into this option list, to replace option at
3231 // vm_options_file_pos (-XX:VMOptionsFile)
3232 jint insert(const JavaVMInitArgs* args,
3233 const JavaVMInitArgs* args_to_insert,
3234 const int vm_options_file_pos) {
3235 assert(_args.options == NULL, "shouldn't be set yet");
3236 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3237 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3238
3239 int length = args->nOptions + args_to_insert->nOptions - 1;
3240 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3241 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3242 for (int i = 0; i < args->nOptions; i++) {
3243 if (i == vm_options_file_pos) {
3244 // insert the new options starting at the same place as the
3245 // -XX:VMOptionsFile option
3246 for (int j = 0; j < args_to_insert->nOptions; j++) {
3247 options->push(args_to_insert->options[j]);
3248 }
3249 } else {
3250 options->push(args->options[i]);
3251 }
3252 }
3253 // make into options array
3254 jint result = set_args(options);
3255 delete options;
3256 return result;
3257 }
3258 };
3259
3260 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3261 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3262 }
3263
3264 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3265 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3266 }
3267
3268 jint Arguments::parse_options_environment_variable(const char* name,
3269 ScopedVMInitArgs* vm_args) {
3270 char *buffer = ::getenv(name);
3271
3272 // Don't check this environment variable if user has special privileges
3273 // (e.g. unix su command).
3274 if (buffer == NULL || os::have_special_privileges()) {
3275 return JNI_OK;
3276 }
3277
3278 if ((buffer = os::strdup(buffer)) == NULL) {
3279 return JNI_ENOMEM;
3280 }
3281
3282 jio_fprintf(defaultStream::error_stream(),
3283 "Picked up %s: %s\n", name, buffer);
3284
3285 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3286
3287 os::free(buffer);
3288 return retcode;
3289 }
3290
3291 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3292 // read file into buffer
3293 int fd = ::open(file_name, O_RDONLY);
3294 if (fd < 0) {
3295 jio_fprintf(defaultStream::error_stream(),
3296 "Could not open options file '%s'\n",
3297 file_name);
3298 return JNI_ERR;
3299 }
3300
3301 struct stat stbuf;
3302 int retcode = os::stat(file_name, &stbuf);
3303 if (retcode != 0) {
3304 jio_fprintf(defaultStream::error_stream(),
3305 "Could not stat options file '%s'\n",
3306 file_name);
3307 os::close(fd);
3308 return JNI_ERR;
3309 }
3310
3311 if (stbuf.st_size == 0) {
3312 // tell caller there is no option data and that is ok
3313 os::close(fd);
3314 return JNI_OK;
3315 }
3316
3317 // '+ 1' for NULL termination even with max bytes
3318 size_t bytes_alloc = stbuf.st_size + 1;
3319
3320 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3321 if (NULL == buf) {
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Could not allocate read buffer for options file parse\n");
3324 os::close(fd);
3325 return JNI_ENOMEM;
3326 }
3327
3328 memset(buf, 0, bytes_alloc);
3329
3330 // Fill buffer
3331 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3332 os::close(fd);
3333 if (bytes_read < 0) {
3334 FREE_C_HEAP_ARRAY(char, buf);
3335 jio_fprintf(defaultStream::error_stream(),
3336 "Could not read options file '%s'\n", file_name);
3337 return JNI_ERR;
3338 }
3339
3340 if (bytes_read == 0) {
3341 // tell caller there is no option data and that is ok
3342 FREE_C_HEAP_ARRAY(char, buf);
3343 return JNI_OK;
3344 }
3345
3346 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3347
3348 FREE_C_HEAP_ARRAY(char, buf);
3349 return retcode;
3350 }
3351
3352 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3353 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3354
3355 // some pointers to help with parsing
3356 char *buffer_end = buffer + buf_len;
3357 char *opt_hd = buffer;
3358 char *wrt = buffer;
3359 char *rd = buffer;
3360
3361 // parse all options
3362 while (rd < buffer_end) {
3363 // skip leading white space from the input string
3364 while (rd < buffer_end && isspace(*rd)) {
3365 rd++;
3366 }
3367
3368 if (rd >= buffer_end) {
3369 break;
3370 }
3371
3372 // Remember this is where we found the head of the token.
3373 opt_hd = wrt;
3374
3375 // Tokens are strings of non white space characters separated
3376 // by one or more white spaces.
3377 while (rd < buffer_end && !isspace(*rd)) {
3378 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3379 int quote = *rd; // matching quote to look for
3380 rd++; // don't copy open quote
3381 while (rd < buffer_end && *rd != quote) {
3382 // include everything (even spaces)
3383 // up until the close quote
3384 *wrt++ = *rd++; // copy to option string
3385 }
3386
3387 if (rd < buffer_end) {
3388 rd++; // don't copy close quote
3389 } else {
3390 // did not see closing quote
3391 jio_fprintf(defaultStream::error_stream(),
3392 "Unmatched quote in %s\n", name);
3393 delete options;
3394 return JNI_ERR;
3395 }
3396 } else {
3397 *wrt++ = *rd++; // copy to option string
3398 }
3399 }
3400
3401 // steal a white space character and set it to NULL
3402 *wrt++ = '\0';
3403 // We now have a complete token
3404
3405 JavaVMOption option;
3406 option.optionString = opt_hd;
3407 option.extraInfo = NULL;
3408
3409 options->append(option); // Fill in option
3410
3411 rd++; // Advance to next character
3412 }
3413
3414 // Fill out JavaVMInitArgs structure.
3415 jint status = vm_args->set_args(options);
3416
3417 delete options;
3418 return status;
3419 }
3420
3421 void Arguments::set_shared_spaces_flags() {
3422 if (DumpSharedSpaces) {
3423 if (FailOverToOldVerifier) {
3424 // Don't fall back to the old verifier on verification failure. If a
3425 // class fails verification with the split verifier, it might fail the
3426 // CDS runtime verifier constraint check. In that case, we don't want
3427 // to share the class. We only archive classes that pass the split verifier.
3428 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3429 }
3430
3431 if (RequireSharedSpaces) {
3432 warning("Cannot dump shared archive while using shared archive");
3433 }
3434 UseSharedSpaces = false;
3435 #ifdef _LP64
3436 if (!UseCompressedOops || !UseCompressedClassPointers) {
3437 vm_exit_during_initialization(
3438 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3439 }
3440 } else {
3441 if (!UseCompressedOops || !UseCompressedClassPointers) {
3442 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3443 }
3444 #endif
3445 }
3446 }
3447
3448 #if INCLUDE_CDS
3449 // Sharing support
3450 // Construct the path to the archive
3451 char* Arguments::get_default_shared_archive_path() {
3452 char *default_archive_path;
3453 char jvm_path[JVM_MAXPATHLEN];
3454 os::jvm_path(jvm_path, sizeof(jvm_path));
3455 char *end = strrchr(jvm_path, *os::file_separator());
3456 if (end != NULL) *end = '\0';
3457 size_t jvm_path_len = strlen(jvm_path);
3458 size_t file_sep_len = strlen(os::file_separator());
3459 const size_t len = jvm_path_len + file_sep_len + 20;
3460 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3461 if (default_archive_path != NULL) {
3462 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3463 jvm_path, os::file_separator());
3464 }
3465 return default_archive_path;
3466 }
3467
3468 int Arguments::num_archives(const char* archive_path) {
3469 if (archive_path == NULL) {
3470 return 0;
3471 }
3472 int npaths = 1;
3473 char* p = (char*)archive_path;
3474 while (*p != '\0') {
3475 if (*p == os::path_separator()[0]) {
3476 npaths++;
3477 }
3478 p++;
3479 }
3480 return npaths;
3481 }
3482
3483 void Arguments::extract_shared_archive_paths(const char* archive_path,
3484 char** base_archive_path,
3485 char** top_archive_path) {
3486 char* begin_ptr = (char*)archive_path;
3487 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3488 if (end_ptr == NULL || end_ptr == begin_ptr) {
3489 vm_exit_during_initialization("Base archive was not specified", archive_path);
3490 }
3491 size_t len = end_ptr - begin_ptr;
3492 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3493 strncpy(cur_path, begin_ptr, len);
3494 cur_path[len] = '\0';
3495 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3496 *base_archive_path = cur_path;
3497
3498 begin_ptr = ++end_ptr;
3499 if (*begin_ptr == '\0') {
3500 vm_exit_during_initialization("Top archive was not specified", archive_path);
3501 }
3502 end_ptr = strchr(begin_ptr, '\0');
3503 assert(end_ptr != NULL, "sanity");
3504 len = end_ptr - begin_ptr;
3505 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3506 strncpy(cur_path, begin_ptr, len + 1);
3507 //cur_path[len] = '\0';
3508 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3509 *top_archive_path = cur_path;
3510 }
3511
3512 bool Arguments::init_shared_archive_paths() {
3513 if (ArchiveClassesAtExit != NULL) {
3514 if (DumpSharedSpaces) {
3515 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3516 }
3517 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3518 return false;
3519 }
3520 check_unsupported_dumping_properties();
3521 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3522 }
3523 if (SharedArchiveFile == NULL) {
3524 SharedArchivePath = get_default_shared_archive_path();
3525 } else {
3526 int archives = num_archives(SharedArchiveFile);
3527 if (DynamicDumpSharedSpaces || DumpSharedSpaces) {
3528 if (archives > 1) {
3529 vm_exit_during_initialization(
3530 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3531 }
3532 if (DynamicDumpSharedSpaces) {
3533 if (FileMapInfo::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3534 vm_exit_during_initialization(
3535 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3536 SharedArchiveFile);
3537 }
3538 }
3539 }
3540 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){
3541 if (archives > 2) {
3542 vm_exit_during_initialization(
3543 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3544 }
3545 if (archives == 1) {
3546 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3547 int name_size;
3548 bool success =
3549 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3550 if (!success) {
3551 SharedArchivePath = temp_archive_path;
3552 } else {
3553 SharedDynamicArchivePath = temp_archive_path;
3554 }
3555 } else {
3556 extract_shared_archive_paths((const char*)SharedArchiveFile,
3557 &SharedArchivePath, &SharedDynamicArchivePath);
3558 }
3559 } else { // CDS dumping
3560 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3561 }
3562 }
3563 return (SharedArchivePath != NULL);
3564 }
3565 #endif // INCLUDE_CDS
3566
3567 #ifndef PRODUCT
3568 // Determine whether LogVMOutput should be implicitly turned on.
3569 static bool use_vm_log() {
3570 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3571 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3572 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3573 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3574 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3575 return true;
3576 }
3577
3578 #ifdef COMPILER1
3579 if (PrintC1Statistics) {
3580 return true;
3581 }
3582 #endif // COMPILER1
3583
3584 #ifdef COMPILER2
3585 if (PrintOptoAssembly || PrintOptoStatistics) {
3586 return true;
3587 }
3588 #endif // COMPILER2
3589
3590 return false;
3591 }
3592
3593 #endif // PRODUCT
3594
3595 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3596 for (int index = 0; index < args->nOptions; index++) {
3597 const JavaVMOption* option = args->options + index;
3598 const char* tail;
3599 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3600 return true;
3601 }
3602 }
3603 return false;
3604 }
3605
3606 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3607 const char* vm_options_file,
3608 const int vm_options_file_pos,
3609 ScopedVMInitArgs* vm_options_file_args,
3610 ScopedVMInitArgs* args_out) {
3611 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3612 if (code != JNI_OK) {
3613 return code;
3614 }
3615
3616 if (vm_options_file_args->get()->nOptions < 1) {
3617 return JNI_OK;
3618 }
3619
3620 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3621 jio_fprintf(defaultStream::error_stream(),
3622 "A VM options file may not refer to a VM options file. "
3623 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3624 "options file '%s' in options container '%s' is an error.\n",
3625 vm_options_file_args->vm_options_file_arg(),
3626 vm_options_file_args->container_name());
3627 return JNI_EINVAL;
3628 }
3629
3630 return args_out->insert(args, vm_options_file_args->get(),
3631 vm_options_file_pos);
3632 }
3633
3634 // Expand -XX:VMOptionsFile found in args_in as needed.
3635 // mod_args and args_out parameters may return values as needed.
3636 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3637 ScopedVMInitArgs* mod_args,
3638 JavaVMInitArgs** args_out) {
3639 jint code = match_special_option_and_act(args_in, mod_args);
3640 if (code != JNI_OK) {
3641 return code;
3642 }
3643
3644 if (mod_args->is_set()) {
3645 // args_in contains -XX:VMOptionsFile and mod_args contains the
3646 // original options from args_in along with the options expanded
3647 // from the VMOptionsFile. Return a short-hand to the caller.
3648 *args_out = mod_args->get();
3649 } else {
3650 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3651 }
3652 return JNI_OK;
3653 }
3654
3655 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3656 ScopedVMInitArgs* args_out) {
3657 // Remaining part of option string
3658 const char* tail;
3659 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3660
3661 for (int index = 0; index < args->nOptions; index++) {
3662 const JavaVMOption* option = args->options + index;
3663 if (match_option(option, "-XX:Flags=", &tail)) {
3664 Arguments::set_jvm_flags_file(tail);
3665 continue;
3666 }
3667 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3668 if (vm_options_file_args.found_vm_options_file_arg()) {
3669 jio_fprintf(defaultStream::error_stream(),
3670 "The option '%s' is already specified in the options "
3671 "container '%s' so the specification of '%s' in the "
3672 "same options container is an error.\n",
3673 vm_options_file_args.vm_options_file_arg(),
3674 vm_options_file_args.container_name(),
3675 option->optionString);
3676 return JNI_EINVAL;
3677 }
3678 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3679 // If there's a VMOptionsFile, parse that
3680 jint code = insert_vm_options_file(args, tail, index,
3681 &vm_options_file_args, args_out);
3682 if (code != JNI_OK) {
3683 return code;
3684 }
3685 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3686 if (args_out->is_set()) {
3687 // The VMOptions file inserted some options so switch 'args'
3688 // to the new set of options, and continue processing which
3689 // preserves "last option wins" semantics.
3690 args = args_out->get();
3691 // The first option from the VMOptionsFile replaces the
3692 // current option. So we back track to process the
3693 // replacement option.
3694 index--;
3695 }
3696 continue;
3697 }
3698 if (match_option(option, "-XX:+PrintVMOptions")) {
3699 PrintVMOptions = true;
3700 continue;
3701 }
3702 if (match_option(option, "-XX:-PrintVMOptions")) {
3703 PrintVMOptions = false;
3704 continue;
3705 }
3706 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3707 IgnoreUnrecognizedVMOptions = true;
3708 continue;
3709 }
3710 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3711 IgnoreUnrecognizedVMOptions = false;
3712 continue;
3713 }
3714 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3715 JVMFlag::printFlags(tty, false);
3716 vm_exit(0);
3717 }
3718 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3719 #if INCLUDE_NMT
3720 // The launcher did not setup nmt environment variable properly.
3721 if (!MemTracker::check_launcher_nmt_support(tail)) {
3722 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3723 }
3724
3725 // Verify if nmt option is valid.
3726 if (MemTracker::verify_nmt_option()) {
3727 // Late initialization, still in single-threaded mode.
3728 if (MemTracker::tracking_level() >= NMT_summary) {
3729 MemTracker::init();
3730 }
3731 } else {
3732 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3733 }
3734 continue;
3735 #else
3736 jio_fprintf(defaultStream::error_stream(),
3737 "Native Memory Tracking is not supported in this VM\n");
3738 return JNI_ERR;
3739 #endif
3740 }
3741
3742 #ifndef PRODUCT
3743 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3744 JVMFlag::printFlags(tty, true);
3745 vm_exit(0);
3746 }
3747 #endif
3748 }
3749 return JNI_OK;
3750 }
3751
3752 static void print_options(const JavaVMInitArgs *args) {
3753 const char* tail;
3754 for (int index = 0; index < args->nOptions; index++) {
3755 const JavaVMOption *option = args->options + index;
3756 if (match_option(option, "-XX:", &tail)) {
3757 logOption(tail);
3758 }
3759 }
3760 }
3761
3762 bool Arguments::handle_deprecated_print_gc_flags() {
3763 if (PrintGC) {
3764 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3765 }
3766 if (PrintGCDetails) {
3767 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3768 }
3769
3770 if (_gc_log_filename != NULL) {
3771 // -Xloggc was used to specify a filename
3772 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3773
3774 LogTarget(Error, logging) target;
3775 LogStream errstream(target);
3776 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3777 } else if (PrintGC || PrintGCDetails) {
3778 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3779 }
3780 return true;
3781 }
3782
3783 void Arguments::handle_extra_cms_flags(const char* msg) {
3784 SpecialFlag flag;
3785 const char *flag_name = "UseConcMarkSweepGC";
3786 if (lookup_special_flag(flag_name, flag)) {
3787 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3788 warning("%s", msg);
3789 }
3790 }
3791
3792 // Parse entry point called from JNI_CreateJavaVM
3793
3794 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3795 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3796
3797 // Initialize ranges, constraints and writeables
3798 JVMFlagRangeList::init();
3799 JVMFlagConstraintList::init();
3800 JVMFlagWriteableList::init();
3801
3802 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3803 const char* hotspotrc = ".hotspotrc";
3804 bool settings_file_specified = false;
3805 bool needs_hotspotrc_warning = false;
3806 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3807 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3808
3809 // Pointers to current working set of containers
3810 JavaVMInitArgs* cur_cmd_args;
3811 JavaVMInitArgs* cur_java_options_args;
3812 JavaVMInitArgs* cur_java_tool_options_args;
3813
3814 // Containers for modified/expanded options
3815 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3816 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3817 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3818
3819
3820 jint code =
3821 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3822 if (code != JNI_OK) {
3823 return code;
3824 }
3825
3826 code = parse_java_options_environment_variable(&initial_java_options_args);
3827 if (code != JNI_OK) {
3828 return code;
3829 }
3830
3831 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3832 &mod_java_tool_options_args,
3833 &cur_java_tool_options_args);
3834 if (code != JNI_OK) {
3835 return code;
3836 }
3837
3838 code = expand_vm_options_as_needed(initial_cmd_args,
3839 &mod_cmd_args,
3840 &cur_cmd_args);
3841 if (code != JNI_OK) {
3842 return code;
3843 }
3844
3845 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3846 &mod_java_options_args,
3847 &cur_java_options_args);
3848 if (code != JNI_OK) {
3849 return code;
3850 }
3851
3852 const char* flags_file = Arguments::get_jvm_flags_file();
3853 settings_file_specified = (flags_file != NULL);
3854
3855 if (IgnoreUnrecognizedVMOptions) {
3856 cur_cmd_args->ignoreUnrecognized = true;
3857 cur_java_tool_options_args->ignoreUnrecognized = true;
3858 cur_java_options_args->ignoreUnrecognized = true;
3859 }
3860
3861 // Parse specified settings file
3862 if (settings_file_specified) {
3863 if (!process_settings_file(flags_file, true,
3864 cur_cmd_args->ignoreUnrecognized)) {
3865 return JNI_EINVAL;
3866 }
3867 } else {
3868 #ifdef ASSERT
3869 // Parse default .hotspotrc settings file
3870 if (!process_settings_file(".hotspotrc", false,
3871 cur_cmd_args->ignoreUnrecognized)) {
3872 return JNI_EINVAL;
3873 }
3874 #else
3875 struct stat buf;
3876 if (os::stat(hotspotrc, &buf) == 0) {
3877 needs_hotspotrc_warning = true;
3878 }
3879 #endif
3880 }
3881
3882 if (PrintVMOptions) {
3883 print_options(cur_java_tool_options_args);
3884 print_options(cur_cmd_args);
3885 print_options(cur_java_options_args);
3886 }
3887
3888 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3889 jint result = parse_vm_init_args(cur_java_tool_options_args,
3890 cur_java_options_args,
3891 cur_cmd_args);
3892
3893 if (result != JNI_OK) {
3894 return result;
3895 }
3896
3897 #if INCLUDE_CDS
3898 // Initialize shared archive paths which could include both base and dynamic archive paths
3899 if (!init_shared_archive_paths()) {
3900 return JNI_ENOMEM;
3901 }
3902 #endif
3903
3904 // Delay warning until here so that we've had a chance to process
3905 // the -XX:-PrintWarnings flag
3906 if (needs_hotspotrc_warning) {
3907 warning("%s file is present but has been ignored. "
3908 "Run with -XX:Flags=%s to load the file.",
3909 hotspotrc, hotspotrc);
3910 }
3911
3912 if (needs_module_property_warning) {
3913 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3914 " names that are reserved for internal use.");
3915 }
3916
3917 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3918 UNSUPPORTED_OPTION(UseLargePages);
3919 #endif
3920
3921 #if defined(AIX)
3922 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3923 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3924 #endif
3925
3926 #ifndef PRODUCT
3927 if (TraceBytecodesAt != 0) {
3928 TraceBytecodes = true;
3929 }
3930 if (CountCompiledCalls) {
3931 if (UseCounterDecay) {
3932 warning("UseCounterDecay disabled because CountCalls is set");
3933 UseCounterDecay = false;
3934 }
3935 }
3936 #endif // PRODUCT
3937
3938 if (ScavengeRootsInCode == 0) {
3939 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3940 warning("Forcing ScavengeRootsInCode non-zero");
3941 }
3942 ScavengeRootsInCode = 1;
3943 }
3944
3945 if (!handle_deprecated_print_gc_flags()) {
3946 return JNI_EINVAL;
3947 }
3948
3949 // Set object alignment values.
3950 set_object_alignment();
3951
3952 #if !INCLUDE_CDS
3953 if (DumpSharedSpaces || RequireSharedSpaces) {
3954 jio_fprintf(defaultStream::error_stream(),
3955 "Shared spaces are not supported in this VM\n");
3956 return JNI_ERR;
3957 }
3958 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3959 log_is_enabled(Info, cds)) {
3960 warning("Shared spaces are not supported in this VM");
3961 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3962 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3963 }
3964 no_shared_spaces("CDS Disabled");
3965 #endif // INCLUDE_CDS
3966
3967 return JNI_OK;
3968 }
3969
3970 jint Arguments::apply_ergo() {
3971 // Set flags based on ergonomics.
3972 jint result = set_ergonomics_flags();
3973 if (result != JNI_OK) return result;
3974
3975 // Set heap size based on available physical memory
3976 set_heap_size();
3977
3978 GCConfig::arguments()->initialize();
3979
3980 set_shared_spaces_flags();
3981
3982 // Initialize Metaspace flags and alignments
3983 Metaspace::ergo_initialize();
3984
3985 // Set compiler flags after GC is selected and GC specific
3986 // flags (LoopStripMiningIter) are set.
3987 CompilerConfig::ergo_initialize();
3988
3989 // Set bytecode rewriting flags
3990 set_bytecode_flags();
3991
3992 // Set flags if aggressive optimization flags are enabled
3993 jint code = set_aggressive_opts_flags();
3994 if (code != JNI_OK) {
3995 return code;
3996 }
3997
3998 // Turn off biased locking for locking debug mode flags,
3999 // which are subtly different from each other but neither works with
4000 // biased locking
4001 if (UseHeavyMonitors
4002 #ifdef COMPILER1
4003 || !UseFastLocking
4004 #endif // COMPILER1
4005 #if INCLUDE_JVMCI
4006 || !JVMCIUseFastLocking
4007 #endif
4008 ) {
4009 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4010 // flag set to true on command line; warn the user that they
4011 // can't enable biased locking here
4012 warning("Biased Locking is not supported with locking debug flags"
4013 "; ignoring UseBiasedLocking flag." );
4014 }
4015 UseBiasedLocking = false;
4016 }
4017
4018 #ifdef CC_INTERP
4019 // Clear flags not supported on zero.
4020 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4021 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4022 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4023 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4024 #endif // CC_INTERP
4025
4026 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4027 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4028 DebugNonSafepoints = true;
4029 }
4030
4031 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4032 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4033 }
4034
4035 // Treat the odd case where local verification is enabled but remote
4036 // verification is not as if both were enabled.
4037 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4038 log_info(verification)("Turning on remote verification because local verification is on");
4039 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4040 }
4041
4042 #ifndef PRODUCT
4043 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4044 if (use_vm_log()) {
4045 LogVMOutput = true;
4046 }
4047 }
4048 #endif // PRODUCT
4049
4050 if (PrintCommandLineFlags) {
4051 JVMFlag::printSetFlags(tty);
4052 }
4053
4054 // Apply CPU specific policy for the BiasedLocking
4055 if (UseBiasedLocking) {
4056 if (!VM_Version::use_biased_locking() &&
4057 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4058 UseBiasedLocking = false;
4059 }
4060 }
4061 #ifdef COMPILER2
4062 if (!UseBiasedLocking) {
4063 UseOptoBiasInlining = false;
4064 }
4065 #endif
4066
4067 #if defined(IA32)
4068 // Only server compiler can optimize safepoints well enough.
4069 if (!is_server_compilation_mode_vm()) {
4070 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false);
4071 }
4072 #endif
4073
4074 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4075 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4076 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4077 } else {
4078 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4079 }
4080
4081 return JNI_OK;
4082 }
4083
4084 jint Arguments::adjust_after_os() {
4085 if (UseNUMA) {
4086 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4087 FLAG_SET_ERGO(UseNUMA, false);
4088 } else if (UseParallelGC || UseParallelOldGC) {
4089 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4090 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4091 }
4092 }
4093 // UseNUMAInterleaving is set to ON for all collectors and
4094 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4095 // such as the parallel collector for Linux and Solaris will
4096 // interleave old gen and survivor spaces on top of NUMA
4097 // allocation policy for the eden space.
4098 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4099 // all platforms and ParallelGC on Windows will interleave all
4100 // of the heap spaces across NUMA nodes.
4101 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4102 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4103 }
4104 }
4105 return JNI_OK;
4106 }
4107
4108 int Arguments::PropertyList_count(SystemProperty* pl) {
4109 int count = 0;
4110 while(pl != NULL) {
4111 count++;
4112 pl = pl->next();
4113 }
4114 return count;
4115 }
4116
4117 // Return the number of readable properties.
4118 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4119 int count = 0;
4120 while(pl != NULL) {
4121 if (pl->is_readable()) {
4122 count++;
4123 }
4124 pl = pl->next();
4125 }
4126 return count;
4127 }
4128
4129 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4130 assert(key != NULL, "just checking");
4131 SystemProperty* prop;
4132 for (prop = pl; prop != NULL; prop = prop->next()) {
4133 if (strcmp(key, prop->key()) == 0) return prop->value();
4134 }
4135 return NULL;
4136 }
4137
4138 // Return the value of the requested property provided that it is a readable property.
4139 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4140 assert(key != NULL, "just checking");
4141 SystemProperty* prop;
4142 // Return the property value if the keys match and the property is not internal or
4143 // it's the special internal property "jdk.boot.class.path.append".
4144 for (prop = pl; prop != NULL; prop = prop->next()) {
4145 if (strcmp(key, prop->key()) == 0) {
4146 if (!prop->internal()) {
4147 return prop->value();
4148 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4149 return prop->value();
4150 } else {
4151 // Property is internal and not jdk.boot.class.path.append so return NULL.
4152 return NULL;
4153 }
4154 }
4155 }
4156 return NULL;
4157 }
4158
4159 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4160 int count = 0;
4161 const char* ret_val = NULL;
4162
4163 while(pl != NULL) {
4164 if(count >= index) {
4165 ret_val = pl->key();
4166 break;
4167 }
4168 count++;
4169 pl = pl->next();
4170 }
4171
4172 return ret_val;
4173 }
4174
4175 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4176 int count = 0;
4177 char* ret_val = NULL;
4178
4179 while(pl != NULL) {
4180 if(count >= index) {
4181 ret_val = pl->value();
4182 break;
4183 }
4184 count++;
4185 pl = pl->next();
4186 }
4187
4188 return ret_val;
4189 }
4190
4191 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4192 SystemProperty* p = *plist;
4193 if (p == NULL) {
4194 *plist = new_p;
4195 } else {
4196 while (p->next() != NULL) {
4197 p = p->next();
4198 }
4199 p->set_next(new_p);
4200 }
4201 }
4202
4203 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4204 bool writeable, bool internal) {
4205 if (plist == NULL)
4206 return;
4207
4208 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4209 PropertyList_add(plist, new_p);
4210 }
4211
4212 void Arguments::PropertyList_add(SystemProperty *element) {
4213 PropertyList_add(&_system_properties, element);
4214 }
4215
4216 // This add maintains unique property key in the list.
4217 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4218 PropertyAppendable append, PropertyWriteable writeable,
4219 PropertyInternal internal) {
4220 if (plist == NULL)
4221 return;
4222
4223 // If property key exist then update with new value.
4224 SystemProperty* prop;
4225 for (prop = *plist; prop != NULL; prop = prop->next()) {
4226 if (strcmp(k, prop->key()) == 0) {
4227 if (append == AppendProperty) {
4228 prop->append_value(v);
4229 } else {
4230 prop->set_value(v);
4231 }
4232 return;
4233 }
4234 }
4235
4236 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4237 }
4238
4239 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4240 // Returns true if all of the source pointed by src has been copied over to
4241 // the destination buffer pointed by buf. Otherwise, returns false.
4242 // Notes:
4243 // 1. If the length (buflen) of the destination buffer excluding the
4244 // NULL terminator character is not long enough for holding the expanded
4245 // pid characters, it also returns false instead of returning the partially
4246 // expanded one.
4247 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4248 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4249 char* buf, size_t buflen) {
4250 const char* p = src;
4251 char* b = buf;
4252 const char* src_end = &src[srclen];
4253 char* buf_end = &buf[buflen - 1];
4254
4255 while (p < src_end && b < buf_end) {
4256 if (*p == '%') {
4257 switch (*(++p)) {
4258 case '%': // "%%" ==> "%"
4259 *b++ = *p++;
4260 break;
4261 case 'p': { // "%p" ==> current process id
4262 // buf_end points to the character before the last character so
4263 // that we could write '\0' to the end of the buffer.
4264 size_t buf_sz = buf_end - b + 1;
4265 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4266
4267 // if jio_snprintf fails or the buffer is not long enough to hold
4268 // the expanded pid, returns false.
4269 if (ret < 0 || ret >= (int)buf_sz) {
4270 return false;
4271 } else {
4272 b += ret;
4273 assert(*b == '\0', "fail in copy_expand_pid");
4274 if (p == src_end && b == buf_end + 1) {
4275 // reach the end of the buffer.
4276 return true;
4277 }
4278 }
4279 p++;
4280 break;
4281 }
4282 default :
4283 *b++ = '%';
4284 }
4285 } else {
4286 *b++ = *p++;
4287 }
4288 }
4289 *b = '\0';
4290 return (p == src_end); // return false if not all of the source was copied
4291 }