1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "logging/logStream.hpp"
37 #include "logging/logTag.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/flags/jvmFlagConstraintList.hpp"
45 #include "runtime/flags/jvmFlagWriteableList.hpp"
46 #include "runtime/flags/jvmFlagRangeList.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.inline.hpp"
50 #include "runtime/safepoint.hpp"
51 #include "runtime/safepointMechanism.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/align.hpp"
56 #include "utilities/defaultStream.hpp"
57 #include "utilities/macros.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JFR
60 #include "jfr/jfr.hpp"
61 #endif
62
63 // Note: This is a special bug reporting site for the JVM
64 #ifdef VENDOR_URL_VM_BUG
65 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
66 #else
67 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
68 #endif
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 size_t Arguments::_conservative_max_heap_alignment = 0;
80 Arguments::Mode Arguments::_mode = _mixed;
81 bool Arguments::_java_compiler = false;
82 bool Arguments::_xdebug_mode = false;
83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85 int Arguments::_sun_java_launcher_pid = -1;
86 bool Arguments::_sun_java_launcher_is_altjvm = false;
87
88 // These parameters are reset in method parse_vm_init_args()
89 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
90 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
91 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
92 bool Arguments::_ClipInlining = ClipInlining;
93 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
94 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
95
96 bool Arguments::_enable_preview = false;
97
98 char* Arguments::SharedArchivePath = NULL;
99 char* Arguments::SharedDynamicArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 // These are not set by the JDK's built-in launchers, but they can be set by
105 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
106 // JavaVMOption in jni.h.
107 abort_hook_t Arguments::_abort_hook = NULL;
108 exit_hook_t Arguments::_exit_hook = NULL;
109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
110
111
112 SystemProperty *Arguments::_sun_boot_library_path = NULL;
113 SystemProperty *Arguments::_java_library_path = NULL;
114 SystemProperty *Arguments::_java_home = NULL;
115 SystemProperty *Arguments::_java_class_path = NULL;
116 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
117 SystemProperty *Arguments::_vm_info = NULL;
118
119 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
120 PathString *Arguments::_system_boot_class_path = NULL;
121 bool Arguments::_has_jimage = false;
122
123 char* Arguments::_ext_dirs = NULL;
124
125 bool PathString::set_value(const char *value) {
126 if (_value != NULL) {
127 FreeHeap(_value);
128 }
129 _value = AllocateHeap(strlen(value)+1, mtArguments);
130 assert(_value != NULL, "Unable to allocate space for new path value");
131 if (_value != NULL) {
132 strcpy(_value, value);
133 } else {
134 // not able to allocate
135 return false;
136 }
137 return true;
138 }
139
140 void PathString::append_value(const char *value) {
141 char *sp;
142 size_t len = 0;
143 if (value != NULL) {
144 len = strlen(value);
145 if (_value != NULL) {
146 len += strlen(_value);
147 }
148 sp = AllocateHeap(len+2, mtArguments);
149 assert(sp != NULL, "Unable to allocate space for new append path value");
150 if (sp != NULL) {
151 if (_value != NULL) {
152 strcpy(sp, _value);
153 strcat(sp, os::path_separator());
154 strcat(sp, value);
155 FreeHeap(_value);
156 } else {
157 strcpy(sp, value);
158 }
159 _value = sp;
160 }
161 }
162 }
163
164 PathString::PathString(const char* value) {
165 if (value == NULL) {
166 _value = NULL;
167 } else {
168 _value = AllocateHeap(strlen(value)+1, mtArguments);
169 strcpy(_value, value);
170 }
171 }
172
173 PathString::~PathString() {
174 if (_value != NULL) {
175 FreeHeap(_value);
176 _value = NULL;
177 }
178 }
179
180 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
181 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
182 size_t len = strlen(module_name) + 1;
183 _module_name = AllocateHeap(len, mtInternal);
184 strncpy(_module_name, module_name, len); // copy the trailing null
185 _path = new PathString(path);
186 }
187
188 ModulePatchPath::~ModulePatchPath() {
189 if (_module_name != NULL) {
190 FreeHeap(_module_name);
191 _module_name = NULL;
192 }
193 if (_path != NULL) {
194 delete _path;
195 _path = NULL;
196 }
197 }
198
199 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
200 if (key == NULL) {
201 _key = NULL;
202 } else {
203 _key = AllocateHeap(strlen(key)+1, mtArguments);
204 strcpy(_key, key);
205 }
206 _next = NULL;
207 _internal = internal;
208 _writeable = writeable;
209 }
210
211 AgentLibrary::AgentLibrary(const char* name, const char* options,
212 bool is_absolute_path, void* os_lib,
213 bool instrument_lib) {
214 _name = AllocateHeap(strlen(name)+1, mtArguments);
215 strcpy(_name, name);
216 if (options == NULL) {
217 _options = NULL;
218 } else {
219 _options = AllocateHeap(strlen(options)+1, mtArguments);
220 strcpy(_options, options);
221 }
222 _is_absolute_path = is_absolute_path;
223 _os_lib = os_lib;
224 _next = NULL;
225 _state = agent_invalid;
226 _is_static_lib = false;
227 _is_instrument_lib = instrument_lib;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = NULL;
246 bool result = match_option(option, name, &tail);
247 if (tail != NULL && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != NULL; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 #if INCLUDE_JFR
270 static bool _has_jfr_option = false; // is using JFR
271
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285
286 bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288 }
289 #endif
290
291 static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295 }
296
297 bool needs_module_property_warning = false;
298
299 #define MODULE_PROPERTY_PREFIX "jdk.module."
300 #define MODULE_PROPERTY_PREFIX_LEN 11
301 #define ADDEXPORTS "addexports"
302 #define ADDEXPORTS_LEN 10
303 #define ADDREADS "addreads"
304 #define ADDREADS_LEN 8
305 #define ADDOPENS "addopens"
306 #define ADDOPENS_LEN 8
307 #define PATCH "patch"
308 #define PATCH_LEN 5
309 #define ADDMODS "addmods"
310 #define ADDMODS_LEN 7
311 #define LIMITMODS "limitmods"
312 #define LIMITMODS_LEN 9
313 #define PATH "path"
314 #define PATH_LEN 4
315 #define UPGRADE_PATH "upgrade.path"
316 #define UPGRADE_PATH_LEN 12
317
318 void Arguments::add_init_library(const char* name, char* options) {
319 _libraryList.add(new AgentLibrary(name, options, false, NULL));
320 }
321
322 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
323 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
324 }
325
326 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
327 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
328 }
329
330 // Late-binding agents not started via arguments
331 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
332 _agentList.add(agentLib);
333 }
334
335 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
336 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
337 return ((strncmp(option, property, len) == 0) &&
338 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
339 }
340
341 // Return true if property starts with "jdk.module." and its ensuing chars match
342 // any of the reserved module properties.
343 // property should be passed without the leading "-D".
344 bool Arguments::is_internal_module_property(const char* property) {
345 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
346 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
347 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
348 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
349 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
350 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
351 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
352 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
353 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
354 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
355 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
356 return true;
357 }
358 }
359 return false;
360 }
361
362 // Process java launcher properties.
363 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
364 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
365 // sun.java.launcher.pid is defined.
366 // Must do this before setting up other system properties,
367 // as some of them may depend on launcher type.
368 for (int index = 0; index < args->nOptions; index++) {
369 const JavaVMOption* option = args->options + index;
370 const char* tail;
371
372 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
373 process_java_launcher_argument(tail, option->extraInfo);
374 continue;
375 }
376 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
377 if (strcmp(tail, "true") == 0) {
378 _sun_java_launcher_is_altjvm = true;
379 }
380 continue;
381 }
382 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
383 _sun_java_launcher_pid = atoi(tail);
384 continue;
385 }
386 }
387 }
388
389 // Initialize system properties key and value.
390 void Arguments::init_system_properties() {
391
392 // Set up _system_boot_class_path which is not a property but
393 // relies heavily on argument processing and the jdk.boot.class.path.append
394 // property. It is used to store the underlying system boot class path.
395 _system_boot_class_path = new PathString(NULL);
396
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
398 "Java Virtual Machine Specification", false));
399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
402
403 // Initialize the vm.info now, but it will need updating after argument parsing.
404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
405
406 // Following are JVMTI agent writable properties.
407 // Properties values are set to NULL and they are
408 // os specific they are initialized in os::init_system_properties_values().
409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
410 _java_library_path = new SystemProperty("java.library.path", NULL, true);
411 _java_home = new SystemProperty("java.home", NULL, true);
412 _java_class_path = new SystemProperty("java.class.path", "", true);
413 // jdk.boot.class.path.append is a non-writeable, internal property.
414 // It can only be set by either:
415 // - -Xbootclasspath/a:
416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
418
419 // Add to System Property list.
420 PropertyList_add(&_system_properties, _sun_boot_library_path);
421 PropertyList_add(&_system_properties, _java_library_path);
422 PropertyList_add(&_system_properties, _java_home);
423 PropertyList_add(&_system_properties, _java_class_path);
424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
425 PropertyList_add(&_system_properties, _vm_info);
426
427 // Set OS specific system properties values
428 os::init_system_properties_values();
429 }
430
431 // Update/Initialize System properties after JDK version number is known
432 void Arguments::init_version_specific_system_properties() {
433 enum { bufsz = 16 };
434 char buffer[bufsz];
435 const char* spec_vendor = "Oracle Corporation";
436 uint32_t spec_version = JDK_Version::current().major_version();
437
438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
439
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.specification.version", buffer, false));
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
446 }
447
448 /*
449 * -XX argument processing:
450 *
451 * -XX arguments are defined in several places, such as:
452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
453 * -XX arguments are parsed in parse_argument().
454 * -XX argument bounds checking is done in check_vm_args_consistency().
455 *
456 * Over time -XX arguments may change. There are mechanisms to handle common cases:
457 *
458 * ALIASED: An option that is simply another name for another option. This is often
459 * part of the process of deprecating a flag, but not all aliases need
460 * to be deprecated.
461 *
462 * Create an alias for an option by adding the old and new option names to the
463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
464 *
465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
466 * support may be removed in the future. Both regular and aliased options may be
467 * deprecated.
468 *
469 * Add a deprecation warning for an option (or alias) by adding an entry in the
470 * "special_jvm_flags" table and setting the "deprecated_in" field.
471 * Often an option "deprecated" in one major release will
472 * be made "obsolete" in the next. In this case the entry should also have its
473 * "obsolete_in" field set.
474 *
475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
476 * on the command line. A warning is printed to let the user know that option might not
477 * be accepted in the future.
478 *
479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
480 * table and setting the "obsolete_in" field.
481 *
482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
483 * to the current JDK version. The system will flatly refuse to admit the existence of
484 * the flag. This allows a flag to die automatically over JDK releases.
485 *
486 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
488 * - Newly obsolete or expired deprecated options should have their global variable
489 * definitions removed (from globals.hpp, etc) and related implementations removed.
490 *
491 * Recommended approach for removing options:
492 *
493 * To remove options commonly used by customers (e.g. product -XX options), use
494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
495 *
496 * To remove internal options (e.g. diagnostic, experimental, develop options), use
497 * a 2-step model adding major release numbers to the obsolete and expire columns.
498 *
499 * To change the name of an option, use the alias table as well as a 2-step
500 * model adding major release numbers to the deprecate and expire columns.
501 * Think twice about aliasing commonly used customer options.
502 *
503 * There are times when it is appropriate to leave a future release number as undefined.
504 *
505 * Tests: Aliases should be tested in VMAliasOptions.java.
506 * Deprecated options should be tested in VMDeprecatedOptions.java.
507 */
508
509 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
510 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
511 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
512 // the command-line as usual, but will issue a warning.
513 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
514 // the command-line, while issuing a warning and ignoring the flag value.
515 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
516 // existence of the flag.
517 //
518 // MANUAL CLEANUP ON JDK VERSION UPDATES:
519 // This table ensures that the handling of options will update automatically when the JDK
520 // version is incremented, but the source code needs to be cleanup up manually:
521 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
522 // variable should be removed, as well as users of the variable.
523 // - As "deprecated" options age into "obsolete" options, move the entry into the
524 // "Obsolete Flags" section of the table.
525 // - All expired options should be removed from the table.
526 static SpecialFlag const special_jvm_flags[] = {
527 // -------------- Deprecated Flags --------------
528 // --- Non-alias flags - sorted by obsolete_in then expired_in:
529 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
535 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() },
536 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
537 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
538 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
540
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 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
566
567 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
568 // These entries will generate build errors. Their purpose is to test the macros.
569 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
570 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
571 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
572 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
573 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
574 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
575 #endif
576
577 { NULL, JDK_Version(0), JDK_Version(0) }
578 };
579
580 // Flags that are aliases for other flags.
581 typedef struct {
582 const char* alias_name;
583 const char* real_name;
584 } AliasedFlag;
585
586 static AliasedFlag const aliased_jvm_flags[] = {
587 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
588 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
589 { NULL, NULL}
590 };
591
592 // NOTE: A compatibility request will be necessary for each alias to be removed.
593 static AliasedLoggingFlag const aliased_logging_flags[] = {
594 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
595 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
596 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
597 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
598 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
599 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
600 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
601 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
602 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
603 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
604 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
605 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
606 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
607 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
608 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) },
609 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
610 };
611
612 #ifndef PRODUCT
613 // These options are removed in jdk9. Remove this code for jdk10.
614 static AliasedFlag const removed_develop_logging_flags[] = {
615 { "TraceClassInitialization", "-Xlog:class+init" },
616 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
617 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
618 { "TraceItables", "-Xlog:itables=debug" },
619 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
620 { "TraceSafepoint", "-Xlog:safepoint=debug" },
621 { "TraceStartupTime", "-Xlog:startuptime" },
622 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
623 { "PrintVtables", "-Xlog:vtables=debug" },
624 { "VerboseVerification", "-Xlog:verification" },
625 { NULL, NULL }
626 };
627 #endif //PRODUCT
628
629 // Return true if "v" is less than "other", where "other" may be "undefined".
630 static bool version_less_than(JDK_Version v, JDK_Version other) {
631 assert(!v.is_undefined(), "must be defined");
632 if (!other.is_undefined() && v.compare(other) >= 0) {
633 return false;
634 } else {
635 return true;
636 }
637 }
638
639 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
640
641 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
642 // Allow extensions to have priority
643 if (lookup_special_flag_ext(flag_name, flag)) {
644 return true;
645 }
646
647 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
648 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
649 flag = special_jvm_flags[i];
650 return true;
651 }
652 }
653 return false;
654 }
655
656 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
657 assert(version != NULL, "Must provide a version buffer");
658 SpecialFlag flag;
659 if (lookup_special_flag(flag_name, flag)) {
660 if (!flag.obsolete_in.is_undefined()) {
661 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
662 *version = flag.obsolete_in;
663 return true;
664 }
665 }
666 }
667 return false;
668 }
669
670 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
671 assert(version != NULL, "Must provide a version buffer");
672 SpecialFlag flag;
673 if (lookup_special_flag(flag_name, flag)) {
674 if (!flag.deprecated_in.is_undefined()) {
675 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
676 version_less_than(JDK_Version::current(), flag.expired_in)) {
677 *version = flag.deprecated_in;
678 return 1;
679 } else {
680 return -1;
681 }
682 }
683 }
684 return 0;
685 }
686
687 #ifndef PRODUCT
688 const char* Arguments::removed_develop_logging_flag_name(const char* name){
689 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
690 const AliasedFlag& flag = removed_develop_logging_flags[i];
691 if (strcmp(flag.alias_name, name) == 0) {
692 return flag.real_name;
693 }
694 }
695 return NULL;
696 }
697 #endif // PRODUCT
698
699 const char* Arguments::real_flag_name(const char *flag_name) {
700 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
701 const AliasedFlag& flag_status = aliased_jvm_flags[i];
702 if (strcmp(flag_status.alias_name, flag_name) == 0) {
703 return flag_status.real_name;
704 }
705 }
706 return flag_name;
707 }
708
709 #ifdef ASSERT
710 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
711 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
712 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
713 return true;
714 }
715 }
716 return false;
717 }
718
719 // Verifies the correctness of the entries in the special_jvm_flags table.
720 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
721 // version being earlier than the deprecation version, then a warning is issued
722 // and verification fails - by returning false. If it is detected that the table
723 // is out of date, with respect to the current version, then a warning is issued
724 // but verification does not fail. This allows the VM to operate when the version
725 // is first updated, without needing to update all the impacted flags at the
726 // same time.
727 static bool verify_special_jvm_flags() {
728 bool success = true;
729 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
730 const SpecialFlag& flag = special_jvm_flags[i];
731 if (lookup_special_flag(flag.name, i)) {
732 warning("Duplicate special flag declaration \"%s\"", flag.name);
733 success = false;
734 }
735 if (flag.deprecated_in.is_undefined() &&
736 flag.obsolete_in.is_undefined()) {
737 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
738 success = false;
739 }
740
741 if (!flag.deprecated_in.is_undefined()) {
742 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
743 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
744 success = false;
745 }
746
747 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
748 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
749 success = false;
750 }
751 }
752
753 if (!flag.obsolete_in.is_undefined()) {
754 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
755 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
756 success = false;
757 }
758
759 // if flag has become obsolete it should not have a "globals" flag defined anymore.
760 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
761 if (JVMFlag::find_flag(flag.name) != NULL) {
762 // Temporarily disable the warning: 8196739
763 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
764 }
765 }
766 }
767
768 if (!flag.expired_in.is_undefined()) {
769 // if flag has become expired it should not have a "globals" flag defined anymore.
770 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
771 if (JVMFlag::find_flag(flag.name) != NULL) {
772 // Temporarily disable the warning: 8196739
773 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
774 }
775 }
776 }
777
778 }
779 return success;
780 }
781 #endif
782
783 // Parses a size specification string.
784 bool Arguments::atojulong(const char *s, julong* result) {
785 julong n = 0;
786
787 // First char must be a digit. Don't allow negative numbers or leading spaces.
788 if (!isdigit(*s)) {
789 return false;
790 }
791
792 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
793 char* remainder;
794 errno = 0;
795 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
796 if (errno != 0) {
797 return false;
798 }
799
800 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
801 if (remainder == s || strlen(remainder) > 1) {
802 return false;
803 }
804
805 switch (*remainder) {
806 case 'T': case 't':
807 *result = n * G * K;
808 // Check for overflow.
809 if (*result/((julong)G * K) != n) return false;
810 return true;
811 case 'G': case 'g':
812 *result = n * G;
813 if (*result/G != n) return false;
814 return true;
815 case 'M': case 'm':
816 *result = n * M;
817 if (*result/M != n) return false;
818 return true;
819 case 'K': case 'k':
820 *result = n * K;
821 if (*result/K != n) return false;
822 return true;
823 case '\0':
824 *result = n;
825 return true;
826 default:
827 return false;
828 }
829 }
830
831 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
832 if (size < min_size) return arg_too_small;
833 if (size > max_size) return arg_too_big;
834 return arg_in_range;
835 }
836
837 // Describe an argument out of range error
838 void Arguments::describe_range_error(ArgsRange errcode) {
839 switch(errcode) {
840 case arg_too_big:
841 jio_fprintf(defaultStream::error_stream(),
842 "The specified size exceeds the maximum "
843 "representable size.\n");
844 break;
845 case arg_too_small:
846 case arg_unreadable:
847 case arg_in_range:
848 // do nothing for now
849 break;
850 default:
851 ShouldNotReachHere();
852 }
853 }
854
855 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
856 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
857 return true;
858 } else {
859 return false;
860 }
861 }
862
863 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
864 char* end;
865 errno = 0;
866 double v = strtod(value, &end);
867 if ((errno != 0) || (*end != 0)) {
868 return false;
869 }
870
871 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
872 return true;
873 }
874 return false;
875 }
876
877 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
878 julong v;
879 int int_v;
880 intx intx_v;
881 bool is_neg = false;
882 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
883
884 if (result == NULL) {
885 return false;
886 }
887
888 // Check the sign first since atojulong() parses only unsigned values.
889 if (*value == '-') {
890 if (!result->is_intx() && !result->is_int()) {
891 return false;
892 }
893 value++;
894 is_neg = true;
895 }
896 if (!Arguments::atojulong(value, &v)) {
897 return false;
898 }
899 if (result->is_int()) {
900 int_v = (int) v;
901 if (is_neg) {
902 int_v = -int_v;
903 }
904 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
905 } else if (result->is_uint()) {
906 uint uint_v = (uint) v;
907 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
908 } else if (result->is_intx()) {
909 intx_v = (intx) v;
910 if (is_neg) {
911 intx_v = -intx_v;
912 }
913 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
914 } else if (result->is_uintx()) {
915 uintx uintx_v = (uintx) v;
916 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
917 } else if (result->is_uint64_t()) {
918 uint64_t uint64_t_v = (uint64_t) v;
919 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
920 } else if (result->is_size_t()) {
921 size_t size_t_v = (size_t) v;
922 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
923 } else if (result->is_double()) {
924 double double_v = (double) v;
925 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
926 } else {
927 return false;
928 }
929 }
930
931 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
932 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
933 // Contract: JVMFlag always returns a pointer that needs freeing.
934 FREE_C_HEAP_ARRAY(char, value);
935 return true;
936 }
937
938 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
939 const char* old_value = "";
940 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
941 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
942 size_t new_len = strlen(new_value);
943 const char* value;
944 char* free_this_too = NULL;
945 if (old_len == 0) {
946 value = new_value;
947 } else if (new_len == 0) {
948 value = old_value;
949 } else {
950 size_t length = old_len + 1 + new_len + 1;
951 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
952 // each new setting adds another LINE to the switch:
953 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
954 value = buf;
955 free_this_too = buf;
956 }
957 (void) JVMFlag::ccstrAtPut(name, &value, origin);
958 // JVMFlag always returns a pointer that needs freeing.
959 FREE_C_HEAP_ARRAY(char, value);
960 if (free_this_too != NULL) {
961 // JVMFlag made its own copy, so I must delete my own temp. buffer.
962 FREE_C_HEAP_ARRAY(char, free_this_too);
963 }
964 return true;
965 }
966
967 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
968 const char* real_name = real_flag_name(arg);
969 JDK_Version since = JDK_Version();
970 switch (is_deprecated_flag(arg, &since)) {
971 case -1:
972 return NULL; // obsolete or expired, don't process normally
973 case 0:
974 return real_name;
975 case 1: {
976 if (warn) {
977 char version[256];
978 since.to_string(version, sizeof(version));
979 if (real_name != arg) {
980 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
981 arg, version, real_name);
982 } else {
983 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
984 arg, version);
985 }
986 }
987 return real_name;
988 }
989 }
990 ShouldNotReachHere();
991 return NULL;
992 }
993
994 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
995 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
996 // Set tagset string buffer at max size of 256, large enough for any alias tagset
997 const int max_tagset_size = 256;
998 int max_tagset_len = max_tagset_size - 1;
999 char tagset_buffer[max_tagset_size];
1000 tagset_buffer[0] = '\0';
1001
1002 // Write tag-set for aliased logging option, in string list form
1003 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1004 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1005 if (i > 0) {
1006 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1007 }
1008 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1009 }
1010 if (!alf.exactMatch) {
1011 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1012 }
1013 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1014 (on) ? "+" : "-",
1015 name,
1016 tagset_buffer,
1017 (on) ? LogLevel::name(alf.level) : "off");
1018 }
1019
1020 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1021 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1022 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1023 if (strcmp(alf.alias_name, name) == 0) {
1024 log_deprecated_flag(name, on, alf);
1025 return alf;
1026 }
1027 }
1028 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1029 return a;
1030 }
1031
1032 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1033
1034 // range of acceptable characters spelled out for portability reasons
1035 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1036 #define BUFLEN 255
1037 char name[BUFLEN+1];
1038 char dummy;
1039 const char* real_name;
1040 bool warn_if_deprecated = true;
1041
1042 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1043 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1044 if (alf.alias_name != NULL){
1045 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1046 return true;
1047 }
1048 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1049 if (real_name == NULL) {
1050 return false;
1051 }
1052 return set_bool_flag(real_name, false, origin);
1053 }
1054 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1055 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1056 if (alf.alias_name != NULL){
1057 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1058 return true;
1059 }
1060 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1061 if (real_name == NULL) {
1062 return false;
1063 }
1064 return set_bool_flag(real_name, true, origin);
1065 }
1066
1067 char punct;
1068 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1069 const char* value = strchr(arg, '=') + 1;
1070 JVMFlag* flag;
1071
1072 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1073 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1074 if (alf.alias_name != NULL) {
1075 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1076 return true;
1077 }
1078 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1079 if (real_name == NULL) {
1080 return false;
1081 }
1082 flag = JVMFlag::find_flag(real_name);
1083 if (flag != NULL && flag->is_ccstr()) {
1084 if (flag->ccstr_accumulates()) {
1085 return append_to_string_flag(real_name, value, origin);
1086 } else {
1087 if (value[0] == '\0') {
1088 value = NULL;
1089 }
1090 return set_string_flag(real_name, value, origin);
1091 }
1092 } else {
1093 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1094 }
1095 }
1096
1097 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1098 const char* value = strchr(arg, '=') + 1;
1099 // -XX:Foo:=xxx will reset the string flag to the given value.
1100 if (value[0] == '\0') {
1101 value = NULL;
1102 }
1103 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1104 if (real_name == NULL) {
1105 return false;
1106 }
1107 return set_string_flag(real_name, value, origin);
1108 }
1109
1110 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1111 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1112 #define NUMBER_RANGE "[0123456789eE+-]"
1113 char value[BUFLEN + 1];
1114 char value2[BUFLEN + 1];
1115 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1116 // Looks like a floating-point number -- try again with more lenient format string
1117 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1118 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1119 if (real_name == NULL) {
1120 return false;
1121 }
1122 return set_fp_numeric_flag(real_name, value, origin);
1123 }
1124 }
1125
1126 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1127 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1128 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1129 if (real_name == NULL) {
1130 return false;
1131 }
1132 return set_numeric_flag(real_name, value, origin);
1133 }
1134
1135 return false;
1136 }
1137
1138 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1139 assert(bldarray != NULL, "illegal argument");
1140
1141 if (arg == NULL) {
1142 return;
1143 }
1144
1145 int new_count = *count + 1;
1146
1147 // expand the array and add arg to the last element
1148 if (*bldarray == NULL) {
1149 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1150 } else {
1151 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1152 }
1153 (*bldarray)[*count] = os::strdup_check_oom(arg);
1154 *count = new_count;
1155 }
1156
1157 void Arguments::build_jvm_args(const char* arg) {
1158 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1159 }
1160
1161 void Arguments::build_jvm_flags(const char* arg) {
1162 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1163 }
1164
1165 // utility function to return a string that concatenates all
1166 // strings in a given char** array
1167 const char* Arguments::build_resource_string(char** args, int count) {
1168 if (args == NULL || count == 0) {
1169 return NULL;
1170 }
1171 size_t length = 0;
1172 for (int i = 0; i < count; i++) {
1173 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1174 }
1175 char* s = NEW_RESOURCE_ARRAY(char, length);
1176 char* dst = s;
1177 for (int j = 0; j < count; j++) {
1178 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1179 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1180 dst += offset;
1181 length -= offset;
1182 }
1183 return (const char*) s;
1184 }
1185
1186 void Arguments::print_on(outputStream* st) {
1187 st->print_cr("VM Arguments:");
1188 if (num_jvm_flags() > 0) {
1189 st->print("jvm_flags: "); print_jvm_flags_on(st);
1190 st->cr();
1191 }
1192 if (num_jvm_args() > 0) {
1193 st->print("jvm_args: "); print_jvm_args_on(st);
1194 st->cr();
1195 }
1196 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1197 if (_java_class_path != NULL) {
1198 char* path = _java_class_path->value();
1199 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1200 }
1201 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1202 }
1203
1204 void Arguments::print_summary_on(outputStream* st) {
1205 // Print the command line. Environment variables that are helpful for
1206 // reproducing the problem are written later in the hs_err file.
1207 // flags are from setting file
1208 if (num_jvm_flags() > 0) {
1209 st->print_raw("Settings File: ");
1210 print_jvm_flags_on(st);
1211 st->cr();
1212 }
1213 // args are the command line and environment variable arguments.
1214 st->print_raw("Command Line: ");
1215 if (num_jvm_args() > 0) {
1216 print_jvm_args_on(st);
1217 }
1218 // this is the classfile and any arguments to the java program
1219 if (java_command() != NULL) {
1220 st->print("%s", java_command());
1221 }
1222 st->cr();
1223 }
1224
1225 void Arguments::print_jvm_flags_on(outputStream* st) {
1226 if (_num_jvm_flags > 0) {
1227 for (int i=0; i < _num_jvm_flags; i++) {
1228 st->print("%s ", _jvm_flags_array[i]);
1229 }
1230 }
1231 }
1232
1233 void Arguments::print_jvm_args_on(outputStream* st) {
1234 if (_num_jvm_args > 0) {
1235 for (int i=0; i < _num_jvm_args; i++) {
1236 st->print("%s ", _jvm_args_array[i]);
1237 }
1238 }
1239 }
1240
1241 bool Arguments::process_argument(const char* arg,
1242 jboolean ignore_unrecognized,
1243 JVMFlag::Flags origin) {
1244 JDK_Version since = JDK_Version();
1245
1246 if (parse_argument(arg, origin)) {
1247 return true;
1248 }
1249
1250 // Determine if the flag has '+', '-', or '=' characters.
1251 bool has_plus_minus = (*arg == '+' || *arg == '-');
1252 const char* const argname = has_plus_minus ? arg + 1 : arg;
1253
1254 size_t arg_len;
1255 const char* equal_sign = strchr(argname, '=');
1256 if (equal_sign == NULL) {
1257 arg_len = strlen(argname);
1258 } else {
1259 arg_len = equal_sign - argname;
1260 }
1261
1262 // Only make the obsolete check for valid arguments.
1263 if (arg_len <= BUFLEN) {
1264 // Construct a string which consists only of the argument name without '+', '-', or '='.
1265 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1266 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1267 if (is_obsolete_flag(stripped_argname, &since)) {
1268 char version[256];
1269 since.to_string(version, sizeof(version));
1270 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1271 return true;
1272 }
1273 #ifndef PRODUCT
1274 else {
1275 const char* replacement;
1276 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1277 log_warning(arguments)("%s has been removed. Please use %s instead.",
1278 stripped_argname,
1279 replacement);
1280 return false;
1281 }
1282 }
1283 #endif //PRODUCT
1284 }
1285
1286 // For locked flags, report a custom error message if available.
1287 // Otherwise, report the standard unrecognized VM option.
1288 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1289 if (found_flag != NULL) {
1290 char locked_message_buf[BUFLEN];
1291 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1292 if (strlen(locked_message_buf) == 0) {
1293 if (found_flag->is_bool() && !has_plus_minus) {
1294 jio_fprintf(defaultStream::error_stream(),
1295 "Missing +/- setting for VM option '%s'\n", argname);
1296 } else if (!found_flag->is_bool() && has_plus_minus) {
1297 jio_fprintf(defaultStream::error_stream(),
1298 "Unexpected +/- setting in VM option '%s'\n", argname);
1299 } else {
1300 jio_fprintf(defaultStream::error_stream(),
1301 "Improperly specified VM option '%s'\n", argname);
1302 }
1303 } else {
1304 #ifdef PRODUCT
1305 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1306 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1307 if (ignore_unrecognized && mismatched) {
1308 return true;
1309 }
1310 #endif
1311 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1312 }
1313 } else {
1314 if (ignore_unrecognized) {
1315 return true;
1316 }
1317 jio_fprintf(defaultStream::error_stream(),
1318 "Unrecognized VM option '%s'\n", argname);
1319 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1320 if (fuzzy_matched != NULL) {
1321 jio_fprintf(defaultStream::error_stream(),
1322 "Did you mean '%s%s%s'? ",
1323 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1324 fuzzy_matched->_name,
1325 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1326 }
1327 }
1328
1329 // allow for commandline "commenting out" options like -XX:#+Verbose
1330 return arg[0] == '#';
1331 }
1332
1333 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1334 FILE* stream = fopen(file_name, "rb");
1335 if (stream == NULL) {
1336 if (should_exist) {
1337 jio_fprintf(defaultStream::error_stream(),
1338 "Could not open settings file %s\n", file_name);
1339 return false;
1340 } else {
1341 return true;
1342 }
1343 }
1344
1345 char token[1024];
1346 int pos = 0;
1347
1348 bool in_white_space = true;
1349 bool in_comment = false;
1350 bool in_quote = false;
1351 char quote_c = 0;
1352 bool result = true;
1353
1354 int c = getc(stream);
1355 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1356 if (in_white_space) {
1357 if (in_comment) {
1358 if (c == '\n') in_comment = false;
1359 } else {
1360 if (c == '#') in_comment = true;
1361 else if (!isspace(c)) {
1362 in_white_space = false;
1363 token[pos++] = c;
1364 }
1365 }
1366 } else {
1367 if (c == '\n' || (!in_quote && isspace(c))) {
1368 // token ends at newline, or at unquoted whitespace
1369 // this allows a way to include spaces in string-valued options
1370 token[pos] = '\0';
1371 logOption(token);
1372 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1373 build_jvm_flags(token);
1374 pos = 0;
1375 in_white_space = true;
1376 in_quote = false;
1377 } else if (!in_quote && (c == '\'' || c == '"')) {
1378 in_quote = true;
1379 quote_c = c;
1380 } else if (in_quote && (c == quote_c)) {
1381 in_quote = false;
1382 } else {
1383 token[pos++] = c;
1384 }
1385 }
1386 c = getc(stream);
1387 }
1388 if (pos > 0) {
1389 token[pos] = '\0';
1390 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1391 build_jvm_flags(token);
1392 }
1393 fclose(stream);
1394 return result;
1395 }
1396
1397 //=============================================================================================================
1398 // Parsing of properties (-D)
1399
1400 const char* Arguments::get_property(const char* key) {
1401 return PropertyList_get_value(system_properties(), key);
1402 }
1403
1404 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1405 const char* eq = strchr(prop, '=');
1406 const char* key;
1407 const char* value = "";
1408
1409 if (eq == NULL) {
1410 // property doesn't have a value, thus use passed string
1411 key = prop;
1412 } else {
1413 // property have a value, thus extract it and save to the
1414 // allocated string
1415 size_t key_len = eq - prop;
1416 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1417
1418 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1419 key = tmp_key;
1420
1421 value = &prop[key_len + 1];
1422 }
1423
1424 if (strcmp(key, "java.compiler") == 0) {
1425 process_java_compiler_argument(value);
1426 // Record value in Arguments, but let it get passed to Java.
1427 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1428 strcmp(key, "sun.java.launcher.pid") == 0) {
1429 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1430 // private and are processed in process_sun_java_launcher_properties();
1431 // the sun.java.launcher property is passed on to the java application
1432 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1433 // append is true, writable is true, internal is false
1434 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1435 WriteableProperty, ExternalProperty);
1436 } else {
1437 if (strcmp(key, "sun.java.command") == 0) {
1438 char *old_java_command = _java_command;
1439 _java_command = os::strdup_check_oom(value, mtArguments);
1440 if (old_java_command != NULL) {
1441 os::free(old_java_command);
1442 }
1443 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1444 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1445 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1446 // its value without going through the property list or making a Java call.
1447 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1448 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1449 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1450 os::free((void *)old_java_vendor_url_bug);
1451 }
1452 }
1453
1454 // Create new property and add at the end of the list
1455 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1456 }
1457
1458 if (key != prop) {
1459 // SystemProperty copy passed value, thus free previously allocated
1460 // memory
1461 FreeHeap((void *)key);
1462 }
1463
1464 return true;
1465 }
1466
1467 #if INCLUDE_CDS
1468 const char* unsupported_properties[] = { "jdk.module.limitmods",
1469 "jdk.module.upgrade.path",
1470 "jdk.module.patch.0" };
1471 const char* unsupported_options[] = { "--limit-modules",
1472 "--upgrade-module-path",
1473 "--patch-module"
1474 };
1475 void Arguments::check_unsupported_dumping_properties() {
1476 assert(DumpSharedSpaces || DynamicDumpSharedSpaces,
1477 "this function is only used with CDS dump time");
1478 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1479 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1480 SystemProperty* sp = system_properties();
1481 while (sp != NULL) {
1482 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1483 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1484 vm_exit_during_initialization(
1485 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1486 }
1487 }
1488 sp = sp->next();
1489 }
1490
1491 // Check for an exploded module build in use with -Xshare:dump.
1492 if (!has_jimage()) {
1493 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1494 }
1495 }
1496
1497 bool Arguments::check_unsupported_cds_runtime_properties() {
1498 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1499 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1500 if (ArchiveClassesAtExit != NULL) {
1501 // dynamic dumping, just return false for now.
1502 // check_unsupported_dumping_properties() will be called later to check the same set of
1503 // properties, and will exit the VM with the correct error message if the unsupported properties
1504 // are used.
1505 return false;
1506 }
1507 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1508 if (get_property(unsupported_properties[i]) != NULL) {
1509 if (RequireSharedSpaces) {
1510 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1511 }
1512 return true;
1513 }
1514 }
1515 return false;
1516 }
1517 #endif
1518
1519 //===========================================================================================================
1520 // Setting int/mixed/comp mode flags
1521
1522 void Arguments::set_mode_flags(Mode mode) {
1523 // Set up default values for all flags.
1524 // If you add a flag to any of the branches below,
1525 // add a default value for it here.
1526 set_java_compiler(false);
1527 _mode = mode;
1528
1529 // Ensure Agent_OnLoad has the correct initial values.
1530 // This may not be the final mode; mode may change later in onload phase.
1531 PropertyList_unique_add(&_system_properties, "java.vm.info",
1532 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1533
1534 UseInterpreter = true;
1535 UseCompiler = true;
1536 UseLoopCounter = true;
1537
1538 // Default values may be platform/compiler dependent -
1539 // use the saved values
1540 ClipInlining = Arguments::_ClipInlining;
1541 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1542 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1543 BackgroundCompilation = Arguments::_BackgroundCompilation;
1544 if (TieredCompilation) {
1545 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1546 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1547 }
1548 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1549 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1550 }
1551 }
1552
1553 // Change from defaults based on mode
1554 switch (mode) {
1555 default:
1556 ShouldNotReachHere();
1557 break;
1558 case _int:
1559 UseCompiler = false;
1560 UseLoopCounter = false;
1561 AlwaysCompileLoopMethods = false;
1562 UseOnStackReplacement = false;
1563 break;
1564 case _mixed:
1565 // same as default
1566 break;
1567 case _comp:
1568 UseInterpreter = false;
1569 BackgroundCompilation = false;
1570 ClipInlining = false;
1571 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1572 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1573 // compile a level 4 (C2) and then continue executing it.
1574 if (TieredCompilation) {
1575 Tier3InvokeNotifyFreqLog = 0;
1576 Tier4InvocationThreshold = 0;
1577 }
1578 break;
1579 }
1580 }
1581
1582 // Conflict: required to use shared spaces (-Xshare:on), but
1583 // incompatible command line options were chosen.
1584 static void no_shared_spaces(const char* message) {
1585 if (RequireSharedSpaces) {
1586 jio_fprintf(defaultStream::error_stream(),
1587 "Class data sharing is inconsistent with other specified options.\n");
1588 vm_exit_during_initialization("Unable to use shared archive", message);
1589 } else {
1590 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1591 }
1592 }
1593
1594 void set_object_alignment() {
1595 // Object alignment.
1596 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1597 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1598 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1599 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1600 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1601 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1602
1603 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1604 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1605
1606 // Oop encoding heap max
1607 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1608
1609 if (SurvivorAlignmentInBytes == 0) {
1610 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1611 }
1612 }
1613
1614 size_t Arguments::max_heap_for_compressed_oops() {
1615 // Avoid sign flip.
1616 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1617 // We need to fit both the NULL page and the heap into the memory budget, while
1618 // keeping alignment constraints of the heap. To guarantee the latter, as the
1619 // NULL page is located before the heap, we pad the NULL page to the conservative
1620 // maximum alignment that the GC may ever impose upon the heap.
1621 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1622 _conservative_max_heap_alignment);
1623
1624 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1625 NOT_LP64(ShouldNotReachHere(); return 0);
1626 }
1627
1628 void Arguments::set_use_compressed_oops() {
1629 #ifndef ZERO
1630 #ifdef _LP64
1631 // MaxHeapSize is not set up properly at this point, but
1632 // the only value that can override MaxHeapSize if we are
1633 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1634 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1635
1636 if (max_heap_size <= max_heap_for_compressed_oops()) {
1637 #if !defined(COMPILER1) || defined(TIERED)
1638 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1639 FLAG_SET_ERGO(UseCompressedOops, true);
1640 }
1641 #endif
1642 } else {
1643 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1644 warning("Max heap size too large for Compressed Oops");
1645 FLAG_SET_DEFAULT(UseCompressedOops, false);
1646 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1647 }
1648 }
1649 #endif // _LP64
1650 #endif // ZERO
1651 }
1652
1653
1654 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1655 // set_use_compressed_oops().
1656 void Arguments::set_use_compressed_klass_ptrs() {
1657 #ifndef ZERO
1658 #ifdef _LP64
1659 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1660 if (!UseCompressedOops) {
1661 if (UseCompressedClassPointers) {
1662 warning("UseCompressedClassPointers requires UseCompressedOops");
1663 }
1664 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1665 } else {
1666 // Turn on UseCompressedClassPointers too
1667 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1668 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1669 }
1670 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1671 if (UseCompressedClassPointers) {
1672 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1673 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1674 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1675 }
1676 }
1677 }
1678 #endif // _LP64
1679 #endif // !ZERO
1680 }
1681
1682 void Arguments::set_conservative_max_heap_alignment() {
1683 // The conservative maximum required alignment for the heap is the maximum of
1684 // the alignments imposed by several sources: any requirements from the heap
1685 // itself and the maximum page size we may run the VM with.
1686 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1687 _conservative_max_heap_alignment = MAX4(heap_alignment,
1688 (size_t)os::vm_allocation_granularity(),
1689 os::max_page_size(),
1690 GCArguments::compute_heap_alignment());
1691 }
1692
1693 jint Arguments::set_ergonomics_flags() {
1694 GCConfig::initialize();
1695
1696 set_conservative_max_heap_alignment();
1697
1698 #ifndef ZERO
1699 #ifdef _LP64
1700 set_use_compressed_oops();
1701
1702 // set_use_compressed_klass_ptrs() must be called after calling
1703 // set_use_compressed_oops().
1704 set_use_compressed_klass_ptrs();
1705
1706 // Also checks that certain machines are slower with compressed oops
1707 // in vm_version initialization code.
1708 #endif // _LP64
1709 #endif // !ZERO
1710
1711 return JNI_OK;
1712 }
1713
1714 julong Arguments::limit_by_allocatable_memory(julong limit) {
1715 julong max_allocatable;
1716 julong result = limit;
1717 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1718 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1719 }
1720 return result;
1721 }
1722
1723 // Use static initialization to get the default before parsing
1724 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1725
1726 void Arguments::set_heap_size() {
1727 julong phys_mem;
1728
1729 // If the user specified one of these options, they
1730 // want specific memory sizing so do not limit memory
1731 // based on compressed oops addressability.
1732 // Also, memory limits will be calculated based on
1733 // available os physical memory, not our MaxRAM limit,
1734 // unless MaxRAM is also specified.
1735 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1736 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1737 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1738 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1739 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1740 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1741 !FLAG_IS_DEFAULT(MaxRAM));
1742 if (override_coop_limit) {
1743 if (FLAG_IS_DEFAULT(MaxRAM)) {
1744 phys_mem = os::physical_memory();
1745 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1746 } else {
1747 phys_mem = (julong)MaxRAM;
1748 }
1749 } else {
1750 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1751 : (julong)MaxRAM;
1752 }
1753
1754
1755 // Convert deprecated flags
1756 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1757 !FLAG_IS_DEFAULT(MaxRAMFraction))
1758 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1759
1760 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1761 !FLAG_IS_DEFAULT(MinRAMFraction))
1762 MinRAMPercentage = 100.0 / MinRAMFraction;
1763
1764 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1765 !FLAG_IS_DEFAULT(InitialRAMFraction))
1766 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1767
1768 // If the maximum heap size has not been set with -Xmx,
1769 // then set it as fraction of the size of physical memory,
1770 // respecting the maximum and minimum sizes of the heap.
1771 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1772 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1773 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1774 if (reasonable_min < MaxHeapSize) {
1775 // Small physical memory, so use a minimum fraction of it for the heap
1776 reasonable_max = reasonable_min;
1777 } else {
1778 // Not-small physical memory, so require a heap at least
1779 // as large as MaxHeapSize
1780 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1781 }
1782
1783 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1784 // Limit the heap size to ErgoHeapSizeLimit
1785 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1786 }
1787
1788 #ifdef _LP64
1789 if (UseCompressedOops) {
1790 // Limit the heap size to the maximum possible when using compressed oops
1791 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1792
1793 // HeapBaseMinAddress can be greater than default but not less than.
1794 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1795 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1796 // matches compressed oops printing flags
1797 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1798 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1799 DefaultHeapBaseMinAddress,
1800 DefaultHeapBaseMinAddress/G,
1801 HeapBaseMinAddress);
1802 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1803 }
1804 }
1805
1806 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1807 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1808 // but it should be not less than default MaxHeapSize.
1809 max_coop_heap -= HeapBaseMinAddress;
1810 }
1811
1812 // If user specified flags prioritizing os physical
1813 // memory limits, then disable compressed oops if
1814 // limits exceed max_coop_heap and UseCompressedOops
1815 // was not specified.
1816 if (reasonable_max > max_coop_heap) {
1817 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1818 FLAG_SET_ERGO(UseCompressedOops, false);
1819 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1820 } else {
1821 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1822 }
1823 }
1824 }
1825 #endif // _LP64
1826
1827 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1828
1829 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1830 // An initial heap size was specified on the command line,
1831 // so be sure that the maximum size is consistent. Done
1832 // after call to limit_by_allocatable_memory because that
1833 // method might reduce the allocation size.
1834 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1835 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1836 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1837 }
1838
1839 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1840 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1841 }
1842
1843 // If the minimum or initial heap_size have not been set or requested to be set
1844 // ergonomically, set them accordingly.
1845 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1846 julong reasonable_minimum = (julong)(OldSize + NewSize);
1847
1848 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1849
1850 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1851
1852 if (InitialHeapSize == 0) {
1853 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1854
1855 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1856 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1857
1858 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1859
1860 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1861 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1862 }
1863 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1864 // synchronize with InitialHeapSize to avoid errors with the default value.
1865 if (MinHeapSize == 0) {
1866 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1867 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1868 }
1869 }
1870 }
1871
1872 // This option inspects the machine and attempts to set various
1873 // parameters to be optimal for long-running, memory allocation
1874 // intensive jobs. It is intended for machines with large
1875 // amounts of cpu and memory.
1876 jint Arguments::set_aggressive_heap_flags() {
1877 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1878 // VM, but we may not be able to represent the total physical memory
1879 // available (like having 8gb of memory on a box but using a 32bit VM).
1880 // Thus, we need to make sure we're using a julong for intermediate
1881 // calculations.
1882 julong initHeapSize;
1883 julong total_memory = os::physical_memory();
1884
1885 if (total_memory < (julong) 256 * M) {
1886 jio_fprintf(defaultStream::error_stream(),
1887 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1888 vm_exit(1);
1889 }
1890
1891 // The heap size is half of available memory, or (at most)
1892 // all of possible memory less 160mb (leaving room for the OS
1893 // when using ISM). This is the maximum; because adaptive sizing
1894 // is turned on below, the actual space used may be smaller.
1895
1896 initHeapSize = MIN2(total_memory / (julong) 2,
1897 total_memory - (julong) 160 * M);
1898
1899 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1900
1901 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1902 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1903 return JNI_EINVAL;
1904 }
1905 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1906 return JNI_EINVAL;
1907 }
1908 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1909 return JNI_EINVAL;
1910 }
1911 }
1912 if (FLAG_IS_DEFAULT(NewSize)) {
1913 // Make the young generation 3/8ths of the total heap.
1914 if (FLAG_SET_CMDLINE(NewSize,
1915 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1916 return JNI_EINVAL;
1917 }
1918 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1919 return JNI_EINVAL;
1920 }
1921 }
1922
1923 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1924 FLAG_SET_DEFAULT(UseLargePages, true);
1925 #endif
1926
1927 // Increase some data structure sizes for efficiency
1928 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1929 return JNI_EINVAL;
1930 }
1931 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1932 return JNI_EINVAL;
1933 }
1934 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1935 return JNI_EINVAL;
1936 }
1937
1938 // See the OldPLABSize comment below, but replace 'after promotion'
1939 // with 'after copying'. YoungPLABSize is the size of the survivor
1940 // space per-gc-thread buffers. The default is 4kw.
1941 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1942 return JNI_EINVAL;
1943 }
1944
1945 // OldPLABSize is the size of the buffers in the old gen that
1946 // UseParallelGC uses to promote live data that doesn't fit in the
1947 // survivor spaces. At any given time, there's one for each gc thread.
1948 // The default size is 1kw. These buffers are rarely used, since the
1949 // survivor spaces are usually big enough. For specjbb, however, there
1950 // are occasions when there's lots of live data in the young gen
1951 // and we end up promoting some of it. We don't have a definite
1952 // explanation for why bumping OldPLABSize helps, but the theory
1953 // is that a bigger PLAB results in retaining something like the
1954 // original allocation order after promotion, which improves mutator
1955 // locality. A minor effect may be that larger PLABs reduce the
1956 // number of PLAB allocation events during gc. The value of 8kw
1957 // was arrived at by experimenting with specjbb.
1958 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1959 return JNI_EINVAL;
1960 }
1961
1962 // Enable parallel GC and adaptive generation sizing
1963 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1964 return JNI_EINVAL;
1965 }
1966
1967 // Encourage steady state memory management
1968 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1969 return JNI_EINVAL;
1970 }
1971
1972 // This appears to improve mutator locality
1973 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1974 return JNI_EINVAL;
1975 }
1976
1977 // Get around early Solaris scheduling bug
1978 // (affinity vs other jobs on system)
1979 // but disallow DR and offlining (5008695).
1980 if (FLAG_SET_CMDLINE(BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1981 return JNI_EINVAL;
1982 }
1983
1984 return JNI_OK;
1985 }
1986
1987 // This must be called after ergonomics.
1988 void Arguments::set_bytecode_flags() {
1989 if (!RewriteBytecodes) {
1990 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1991 }
1992 }
1993
1994 // Aggressive optimization flags
1995 jint Arguments::set_aggressive_opts_flags() {
1996 #ifdef COMPILER2
1997 if (AggressiveUnboxing) {
1998 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1999 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2000 } else if (!EliminateAutoBox) {
2001 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2002 AggressiveUnboxing = false;
2003 }
2004 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2005 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2006 } else if (!DoEscapeAnalysis) {
2007 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2008 AggressiveUnboxing = false;
2009 }
2010 }
2011 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2012 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2013 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2014 }
2015 // Feed the cache size setting into the JDK
2016 char buffer[1024];
2017 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2018 if (!add_property(buffer)) {
2019 return JNI_ENOMEM;
2020 }
2021 }
2022 #endif
2023
2024 return JNI_OK;
2025 }
2026
2027 //===========================================================================================================
2028 // Parsing of java.compiler property
2029
2030 void Arguments::process_java_compiler_argument(const char* arg) {
2031 // For backwards compatibility, Djava.compiler=NONE or ""
2032 // causes us to switch to -Xint mode UNLESS -Xdebug
2033 // is also specified.
2034 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2035 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2036 }
2037 }
2038
2039 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2040 _sun_java_launcher = os::strdup_check_oom(launcher);
2041 }
2042
2043 bool Arguments::created_by_java_launcher() {
2044 assert(_sun_java_launcher != NULL, "property must have value");
2045 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2046 }
2047
2048 bool Arguments::sun_java_launcher_is_altjvm() {
2049 return _sun_java_launcher_is_altjvm;
2050 }
2051
2052 //===========================================================================================================
2053 // Parsing of main arguments
2054
2055 unsigned int addreads_count = 0;
2056 unsigned int addexports_count = 0;
2057 unsigned int addopens_count = 0;
2058 unsigned int addmods_count = 0;
2059 unsigned int patch_mod_count = 0;
2060
2061 // Check the consistency of vm_init_args
2062 bool Arguments::check_vm_args_consistency() {
2063 // Method for adding checks for flag consistency.
2064 // The intent is to warn the user of all possible conflicts,
2065 // before returning an error.
2066 // Note: Needs platform-dependent factoring.
2067 bool status = true;
2068
2069 if (TLABRefillWasteFraction == 0) {
2070 jio_fprintf(defaultStream::error_stream(),
2071 "TLABRefillWasteFraction should be a denominator, "
2072 "not " SIZE_FORMAT "\n",
2073 TLABRefillWasteFraction);
2074 status = false;
2075 }
2076
2077 if (PrintNMTStatistics) {
2078 #if INCLUDE_NMT
2079 if (MemTracker::tracking_level() == NMT_off) {
2080 #endif // INCLUDE_NMT
2081 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2082 PrintNMTStatistics = false;
2083 #if INCLUDE_NMT
2084 }
2085 #endif
2086 }
2087
2088 status = CompilerConfig::check_args_consistency(status);
2089 #if INCLUDE_JVMCI
2090 if (status && EnableJVMCI) {
2091 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2092 AddProperty, UnwriteableProperty, InternalProperty);
2093 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2094 return false;
2095 }
2096 }
2097 #endif
2098
2099 #ifndef SUPPORT_RESERVED_STACK_AREA
2100 if (StackReservedPages != 0) {
2101 FLAG_SET_CMDLINE(StackReservedPages, 0);
2102 warning("Reserved Stack Area not supported on this platform");
2103 }
2104 #endif
2105
2106 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2107 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2108 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2109 }
2110 }
2111
2112 status = status && GCArguments::check_args_consistency();
2113
2114 if (LP64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypePassFieldsAsArgs)) {
2115 FLAG_SET_CMDLINE(ValueTypePassFieldsAsArgs, false);
2116 warning("ValueTypePassFieldsAsArgs is not supported on this platform");
2117 }
2118
2119 if (LP64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypeReturnedAsFields)) {
2120 FLAG_SET_CMDLINE(ValueTypeReturnedAsFields, false);
2121 warning("ValueTypeReturnedAsFields is not supported on this platform");
2122 }
2123
2124 if (EnableValhalla) {
2125 if (!EnableValhallaC1) {
2126 // C1 support for value types is incomplete. Don't use it by default.
2127 if (!FLAG_IS_DEFAULT(TieredCompilation)) {
2128 warning("TieredCompilation disabled because value types are not fully supported by C1");
2129 }
2130 FLAG_SET_CMDLINE(TieredCompilation, false);
2131 } else {
2132 /*
2133 TEMP: to run the valuetype tests with C1, you need to use the following command-line:
2134
2135 cd test/hotspot/jtreg/compiler/valhalla/valuetypes
2136 jtreg \
2137 -javaoption:-XX:+EnableValhallaC1 \
2138 -javaoption:-XX:TieredStopAtLevel=1 \
2139 .
2140
2141 */
2142 }
2143 }
2144 if (!EnableValhalla && ACmpOnValues != 3) {
2145 FLAG_SET_CMDLINE(ACmpOnValues, 0);
2146 }
2147 return status;
2148 }
2149
2150 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2151 const char* option_type) {
2152 if (ignore) return false;
2153
2154 const char* spacer = " ";
2155 if (option_type == NULL) {
2156 option_type = ++spacer; // Set both to the empty string.
2157 }
2158
2159 jio_fprintf(defaultStream::error_stream(),
2160 "Unrecognized %s%soption: %s\n", option_type, spacer,
2161 option->optionString);
2162 return true;
2163 }
2164
2165 static const char* user_assertion_options[] = {
2166 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2167 };
2168
2169 static const char* system_assertion_options[] = {
2170 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2171 };
2172
2173 bool Arguments::parse_uintx(const char* value,
2174 uintx* uintx_arg,
2175 uintx min_size) {
2176
2177 // Check the sign first since atojulong() parses only unsigned values.
2178 bool value_is_positive = !(*value == '-');
2179
2180 if (value_is_positive) {
2181 julong n;
2182 bool good_return = atojulong(value, &n);
2183 if (good_return) {
2184 bool above_minimum = n >= min_size;
2185 bool value_is_too_large = n > max_uintx;
2186
2187 if (above_minimum && !value_is_too_large) {
2188 *uintx_arg = n;
2189 return true;
2190 }
2191 }
2192 }
2193 return false;
2194 }
2195
2196 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2197 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2198 char* property = AllocateHeap(prop_len, mtArguments);
2199 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2200 if (ret < 0 || ret >= (int)prop_len) {
2201 FreeHeap(property);
2202 return false;
2203 }
2204 bool added = add_property(property, UnwriteableProperty, internal);
2205 FreeHeap(property);
2206 return added;
2207 }
2208
2209 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2210 const unsigned int props_count_limit = 1000;
2211 const int max_digits = 3;
2212 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2213
2214 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2215 if (count < props_count_limit) {
2216 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2217 char* property = AllocateHeap(prop_len, mtArguments);
2218 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2219 if (ret < 0 || ret >= (int)prop_len) {
2220 FreeHeap(property);
2221 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2222 return false;
2223 }
2224 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2225 FreeHeap(property);
2226 return added;
2227 }
2228
2229 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2230 return false;
2231 }
2232
2233 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2234 julong* long_arg,
2235 julong min_size,
2236 julong max_size) {
2237 if (!atojulong(s, long_arg)) return arg_unreadable;
2238 return check_memory_size(*long_arg, min_size, max_size);
2239 }
2240
2241 // Parse JavaVMInitArgs structure
2242
2243 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2244 const JavaVMInitArgs *java_options_args,
2245 const JavaVMInitArgs *cmd_line_args) {
2246 bool patch_mod_javabase = false;
2247
2248 // Save default settings for some mode flags
2249 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2250 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2251 Arguments::_ClipInlining = ClipInlining;
2252 Arguments::_BackgroundCompilation = BackgroundCompilation;
2253 if (TieredCompilation) {
2254 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2255 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2256 }
2257
2258 // Setup flags for mixed which is the default
2259 set_mode_flags(_mixed);
2260
2261 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2262 // variable (if present).
2263 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2264 if (result != JNI_OK) {
2265 return result;
2266 }
2267
2268 // Parse args structure generated from the command line flags.
2269 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2270 if (result != JNI_OK) {
2271 return result;
2272 }
2273
2274 // Parse args structure generated from the _JAVA_OPTIONS environment
2275 // variable (if present) (mimics classic VM)
2276 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2277 if (result != JNI_OK) {
2278 return result;
2279 }
2280
2281 // We need to ensure processor and memory resources have been properly
2282 // configured - which may rely on arguments we just processed - before
2283 // doing the final argument processing. Any argument processing that
2284 // needs to know about processor and memory resources must occur after
2285 // this point.
2286
2287 os::init_container_support();
2288
2289 // Do final processing now that all arguments have been parsed
2290 result = finalize_vm_init_args(patch_mod_javabase);
2291 if (result != JNI_OK) {
2292 return result;
2293 }
2294
2295 return JNI_OK;
2296 }
2297
2298 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2299 // represents a valid JDWP agent. is_path==true denotes that we
2300 // are dealing with -agentpath (case where name is a path), otherwise with
2301 // -agentlib
2302 bool valid_jdwp_agent(char *name, bool is_path) {
2303 char *_name;
2304 const char *_jdwp = "jdwp";
2305 size_t _len_jdwp, _len_prefix;
2306
2307 if (is_path) {
2308 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2309 return false;
2310 }
2311
2312 _name++; // skip past last path separator
2313 _len_prefix = strlen(JNI_LIB_PREFIX);
2314
2315 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2316 return false;
2317 }
2318
2319 _name += _len_prefix;
2320 _len_jdwp = strlen(_jdwp);
2321
2322 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2323 _name += _len_jdwp;
2324 }
2325 else {
2326 return false;
2327 }
2328
2329 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2330 return false;
2331 }
2332
2333 return true;
2334 }
2335
2336 if (strcmp(name, _jdwp) == 0) {
2337 return true;
2338 }
2339
2340 return false;
2341 }
2342
2343 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2344 // --patch-module=<module>=<file>(<pathsep><file>)*
2345 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2346 // Find the equal sign between the module name and the path specification
2347 const char* module_equal = strchr(patch_mod_tail, '=');
2348 if (module_equal == NULL) {
2349 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2350 return JNI_ERR;
2351 } else {
2352 // Pick out the module name
2353 size_t module_len = module_equal - patch_mod_tail;
2354 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2355 if (module_name != NULL) {
2356 memcpy(module_name, patch_mod_tail, module_len);
2357 *(module_name + module_len) = '\0';
2358 // The path piece begins one past the module_equal sign
2359 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2360 FREE_C_HEAP_ARRAY(char, module_name);
2361 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2362 return JNI_ENOMEM;
2363 }
2364 } else {
2365 return JNI_ENOMEM;
2366 }
2367 }
2368 return JNI_OK;
2369 }
2370
2371 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2372 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2373 // The min and max sizes match the values in globals.hpp, but scaled
2374 // with K. The values have been chosen so that alignment with page
2375 // size doesn't change the max value, which makes the conversions
2376 // back and forth between Xss value and ThreadStackSize value easier.
2377 // The values have also been chosen to fit inside a 32-bit signed type.
2378 const julong min_ThreadStackSize = 0;
2379 const julong max_ThreadStackSize = 1 * M;
2380
2381 const julong min_size = min_ThreadStackSize * K;
2382 const julong max_size = max_ThreadStackSize * K;
2383
2384 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2385
2386 julong size = 0;
2387 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2388 if (errcode != arg_in_range) {
2389 bool silent = (option == NULL); // Allow testing to silence error messages
2390 if (!silent) {
2391 jio_fprintf(defaultStream::error_stream(),
2392 "Invalid thread stack size: %s\n", option->optionString);
2393 describe_range_error(errcode);
2394 }
2395 return JNI_EINVAL;
2396 }
2397
2398 // Internally track ThreadStackSize in units of 1024 bytes.
2399 const julong size_aligned = align_up(size, K);
2400 assert(size <= size_aligned,
2401 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2402 size, size_aligned);
2403
2404 const julong size_in_K = size_aligned / K;
2405 assert(size_in_K < (julong)max_intx,
2406 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2407 size_in_K);
2408
2409 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2410 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2411 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2412 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2413 max_expanded, size_in_K);
2414
2415 *out_ThreadStackSize = (intx)size_in_K;
2416
2417 return JNI_OK;
2418 }
2419
2420 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2421 // For match_option to return remaining or value part of option string
2422 const char* tail;
2423
2424 // iterate over arguments
2425 for (int index = 0; index < args->nOptions; index++) {
2426 bool is_absolute_path = false; // for -agentpath vs -agentlib
2427
2428 const JavaVMOption* option = args->options + index;
2429
2430 if (!match_option(option, "-Djava.class.path", &tail) &&
2431 !match_option(option, "-Dsun.java.command", &tail) &&
2432 !match_option(option, "-Dsun.java.launcher", &tail)) {
2433
2434 // add all jvm options to the jvm_args string. This string
2435 // is used later to set the java.vm.args PerfData string constant.
2436 // the -Djava.class.path and the -Dsun.java.command options are
2437 // omitted from jvm_args string as each have their own PerfData
2438 // string constant object.
2439 build_jvm_args(option->optionString);
2440 }
2441
2442 // -verbose:[class/module/gc/jni]
2443 if (match_option(option, "-verbose", &tail)) {
2444 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2445 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2446 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2447 } else if (!strcmp(tail, ":module")) {
2448 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2449 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2450 } else if (!strcmp(tail, ":gc")) {
2451 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2452 } else if (!strcmp(tail, ":jni")) {
2453 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 }
2457 // -da / -ea / -disableassertions / -enableassertions
2458 // These accept an optional class/package name separated by a colon, e.g.,
2459 // -da:java.lang.Thread.
2460 } else if (match_option(option, user_assertion_options, &tail, true)) {
2461 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2462 if (*tail == '\0') {
2463 JavaAssertions::setUserClassDefault(enable);
2464 } else {
2465 assert(*tail == ':', "bogus match by match_option()");
2466 JavaAssertions::addOption(tail + 1, enable);
2467 }
2468 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2469 } else if (match_option(option, system_assertion_options, &tail, false)) {
2470 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2471 JavaAssertions::setSystemClassDefault(enable);
2472 // -bootclasspath:
2473 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2474 jio_fprintf(defaultStream::output_stream(),
2475 "-Xbootclasspath is no longer a supported option.\n");
2476 return JNI_EINVAL;
2477 // -bootclasspath/a:
2478 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2479 Arguments::append_sysclasspath(tail);
2480 // -bootclasspath/p:
2481 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2482 jio_fprintf(defaultStream::output_stream(),
2483 "-Xbootclasspath/p is no longer a supported option.\n");
2484 return JNI_EINVAL;
2485 // -Xrun
2486 } else if (match_option(option, "-Xrun", &tail)) {
2487 if (tail != NULL) {
2488 const char* pos = strchr(tail, ':');
2489 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2490 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2491 jio_snprintf(name, len + 1, "%s", tail);
2492
2493 char *options = NULL;
2494 if(pos != NULL) {
2495 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2496 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2497 }
2498 #if !INCLUDE_JVMTI
2499 if (strcmp(name, "jdwp") == 0) {
2500 jio_fprintf(defaultStream::error_stream(),
2501 "Debugging agents are not supported in this VM\n");
2502 return JNI_ERR;
2503 }
2504 #endif // !INCLUDE_JVMTI
2505 add_init_library(name, options);
2506 }
2507 } else if (match_option(option, "--add-reads=", &tail)) {
2508 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2509 return JNI_ENOMEM;
2510 }
2511 } else if (match_option(option, "--add-exports=", &tail)) {
2512 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2513 return JNI_ENOMEM;
2514 }
2515 } else if (match_option(option, "--add-opens=", &tail)) {
2516 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2517 return JNI_ENOMEM;
2518 }
2519 } else if (match_option(option, "--add-modules=", &tail)) {
2520 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2521 return JNI_ENOMEM;
2522 }
2523 } else if (match_option(option, "--limit-modules=", &tail)) {
2524 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2525 return JNI_ENOMEM;
2526 }
2527 } else if (match_option(option, "--module-path=", &tail)) {
2528 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2529 return JNI_ENOMEM;
2530 }
2531 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2532 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2533 return JNI_ENOMEM;
2534 }
2535 } else if (match_option(option, "--patch-module=", &tail)) {
2536 // --patch-module=<module>=<file>(<pathsep><file>)*
2537 int res = process_patch_mod_option(tail, patch_mod_javabase);
2538 if (res != JNI_OK) {
2539 return res;
2540 }
2541 } else if (match_option(option, "--illegal-access=", &tail)) {
2542 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2543 return JNI_ENOMEM;
2544 }
2545 // -agentlib and -agentpath
2546 } else if (match_option(option, "-agentlib:", &tail) ||
2547 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2548 if(tail != NULL) {
2549 const char* pos = strchr(tail, '=');
2550 char* name;
2551 if (pos == NULL) {
2552 name = os::strdup_check_oom(tail, mtArguments);
2553 } else {
2554 size_t len = pos - tail;
2555 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2556 memcpy(name, tail, len);
2557 name[len] = '\0';
2558 }
2559
2560 char *options = NULL;
2561 if(pos != NULL) {
2562 options = os::strdup_check_oom(pos + 1, mtArguments);
2563 }
2564 #if !INCLUDE_JVMTI
2565 if (valid_jdwp_agent(name, is_absolute_path)) {
2566 jio_fprintf(defaultStream::error_stream(),
2567 "Debugging agents are not supported in this VM\n");
2568 return JNI_ERR;
2569 }
2570 #endif // !INCLUDE_JVMTI
2571 add_init_agent(name, options, is_absolute_path);
2572 }
2573 // -javaagent
2574 } else if (match_option(option, "-javaagent:", &tail)) {
2575 #if !INCLUDE_JVMTI
2576 jio_fprintf(defaultStream::error_stream(),
2577 "Instrumentation agents are not supported in this VM\n");
2578 return JNI_ERR;
2579 #else
2580 if (tail != NULL) {
2581 size_t length = strlen(tail) + 1;
2582 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2583 jio_snprintf(options, length, "%s", tail);
2584 add_instrument_agent("instrument", options, false);
2585 // java agents need module java.instrument
2586 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2587 return JNI_ENOMEM;
2588 }
2589 }
2590 #endif // !INCLUDE_JVMTI
2591 // --enable_preview
2592 } else if (match_option(option, "--enable-preview")) {
2593 set_enable_preview();
2594 // -Xnoclassgc
2595 } else if (match_option(option, "-Xnoclassgc")) {
2596 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2597 return JNI_EINVAL;
2598 }
2599 // -Xconcgc
2600 } else if (match_option(option, "-Xconcgc")) {
2601 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2602 return JNI_EINVAL;
2603 }
2604 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2605 // -Xnoconcgc
2606 } else if (match_option(option, "-Xnoconcgc")) {
2607 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2608 return JNI_EINVAL;
2609 }
2610 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2611 // -Xbatch
2612 } else if (match_option(option, "-Xbatch")) {
2613 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2614 return JNI_EINVAL;
2615 }
2616 // -Xmn for compatibility with other JVM vendors
2617 } else if (match_option(option, "-Xmn", &tail)) {
2618 julong long_initial_young_size = 0;
2619 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2620 if (errcode != arg_in_range) {
2621 jio_fprintf(defaultStream::error_stream(),
2622 "Invalid initial young generation size: %s\n", option->optionString);
2623 describe_range_error(errcode);
2624 return JNI_EINVAL;
2625 }
2626 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2627 return JNI_EINVAL;
2628 }
2629 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2630 return JNI_EINVAL;
2631 }
2632 // -Xms
2633 } else if (match_option(option, "-Xms", &tail)) {
2634 julong size = 0;
2635 // an initial heap size of 0 means automatically determine
2636 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2637 if (errcode != arg_in_range) {
2638 jio_fprintf(defaultStream::error_stream(),
2639 "Invalid initial heap size: %s\n", option->optionString);
2640 describe_range_error(errcode);
2641 return JNI_EINVAL;
2642 }
2643 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 // -Xmx
2650 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2651 julong long_max_heap_size = 0;
2652 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2653 if (errcode != arg_in_range) {
2654 jio_fprintf(defaultStream::error_stream(),
2655 "Invalid maximum heap size: %s\n", option->optionString);
2656 describe_range_error(errcode);
2657 return JNI_EINVAL;
2658 }
2659 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2660 return JNI_EINVAL;
2661 }
2662 // Xmaxf
2663 } else if (match_option(option, "-Xmaxf", &tail)) {
2664 char* err;
2665 int maxf = (int)(strtod(tail, &err) * 100);
2666 if (*err != '\0' || *tail == '\0') {
2667 jio_fprintf(defaultStream::error_stream(),
2668 "Bad max heap free percentage size: %s\n",
2669 option->optionString);
2670 return JNI_EINVAL;
2671 } else {
2672 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 }
2676 // Xminf
2677 } else if (match_option(option, "-Xminf", &tail)) {
2678 char* err;
2679 int minf = (int)(strtod(tail, &err) * 100);
2680 if (*err != '\0' || *tail == '\0') {
2681 jio_fprintf(defaultStream::error_stream(),
2682 "Bad min heap free percentage size: %s\n",
2683 option->optionString);
2684 return JNI_EINVAL;
2685 } else {
2686 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 }
2690 // -Xss
2691 } else if (match_option(option, "-Xss", &tail)) {
2692 intx value = 0;
2693 jint err = parse_xss(option, tail, &value);
2694 if (err != JNI_OK) {
2695 return err;
2696 }
2697 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2701 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2702 julong long_ReservedCodeCacheSize = 0;
2703
2704 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2705 if (errcode != arg_in_range) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Invalid maximum code cache size: %s.\n", option->optionString);
2708 return JNI_EINVAL;
2709 }
2710 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 // -green
2714 } else if (match_option(option, "-green")) {
2715 jio_fprintf(defaultStream::error_stream(),
2716 "Green threads support not available\n");
2717 return JNI_EINVAL;
2718 // -native
2719 } else if (match_option(option, "-native")) {
2720 // HotSpot always uses native threads, ignore silently for compatibility
2721 // -Xrs
2722 } else if (match_option(option, "-Xrs")) {
2723 // Classic/EVM option, new functionality
2724 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 // -Xprof
2728 } else if (match_option(option, "-Xprof")) {
2729 char version[256];
2730 // Obsolete in JDK 10
2731 JDK_Version::jdk(10).to_string(version, sizeof(version));
2732 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2733 // -Xinternalversion
2734 } else if (match_option(option, "-Xinternalversion")) {
2735 jio_fprintf(defaultStream::output_stream(), "%s\n",
2736 VM_Version::internal_vm_info_string());
2737 vm_exit(0);
2738 #ifndef PRODUCT
2739 // -Xprintflags
2740 } else if (match_option(option, "-Xprintflags")) {
2741 JVMFlag::printFlags(tty, false);
2742 vm_exit(0);
2743 #endif
2744 // -D
2745 } else if (match_option(option, "-D", &tail)) {
2746 const char* value;
2747 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2748 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2749 // abort if -Djava.endorsed.dirs is set
2750 jio_fprintf(defaultStream::output_stream(),
2751 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2752 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2753 return JNI_EINVAL;
2754 }
2755 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2756 *value != '\0' && strcmp(value, "\"\"") != 0) {
2757 // abort if -Djava.ext.dirs is set
2758 jio_fprintf(defaultStream::output_stream(),
2759 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2760 return JNI_EINVAL;
2761 }
2762 // Check for module related properties. They must be set using the modules
2763 // options. For example: use "--add-modules=java.sql", not
2764 // "-Djdk.module.addmods=java.sql"
2765 if (is_internal_module_property(option->optionString + 2)) {
2766 needs_module_property_warning = true;
2767 continue;
2768 }
2769
2770 if (!add_property(tail)) {
2771 return JNI_ENOMEM;
2772 }
2773 // Out of the box management support
2774 if (match_option(option, "-Dcom.sun.management", &tail)) {
2775 #if INCLUDE_MANAGEMENT
2776 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 // management agent in module jdk.management.agent
2780 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2781 return JNI_ENOMEM;
2782 }
2783 #else
2784 jio_fprintf(defaultStream::output_stream(),
2785 "-Dcom.sun.management is not supported in this VM.\n");
2786 return JNI_ERR;
2787 #endif
2788 }
2789 // -Xint
2790 } else if (match_option(option, "-Xint")) {
2791 set_mode_flags(_int);
2792 // -Xmixed
2793 } else if (match_option(option, "-Xmixed")) {
2794 set_mode_flags(_mixed);
2795 // -Xcomp
2796 } else if (match_option(option, "-Xcomp")) {
2797 // for testing the compiler; turn off all flags that inhibit compilation
2798 set_mode_flags(_comp);
2799 // -Xshare:dump
2800 } else if (match_option(option, "-Xshare:dump")) {
2801 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 // -Xshare:on
2805 } else if (match_option(option, "-Xshare:on")) {
2806 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2807 return JNI_EINVAL;
2808 }
2809 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2813 } else if (match_option(option, "-Xshare:auto")) {
2814 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2818 return JNI_EINVAL;
2819 }
2820 // -Xshare:off
2821 } else if (match_option(option, "-Xshare:off")) {
2822 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2823 return JNI_EINVAL;
2824 }
2825 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 // -Xverify
2829 } else if (match_option(option, "-Xverify", &tail)) {
2830 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2831 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 } else if (strcmp(tail, ":remote") == 0) {
2838 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2842 return JNI_EINVAL;
2843 }
2844 } else if (strcmp(tail, ":none") == 0) {
2845 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2846 return JNI_EINVAL;
2847 }
2848 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2849 return JNI_EINVAL;
2850 }
2851 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2852 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2853 return JNI_EINVAL;
2854 }
2855 // -Xdebug
2856 } else if (match_option(option, "-Xdebug")) {
2857 // note this flag has been used, then ignore
2858 set_xdebug_mode(true);
2859 // -Xnoagent
2860 } else if (match_option(option, "-Xnoagent")) {
2861 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2862 } else if (match_option(option, "-Xloggc:", &tail)) {
2863 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2864 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2865 _gc_log_filename = os::strdup_check_oom(tail);
2866 } else if (match_option(option, "-Xlog", &tail)) {
2867 bool ret = false;
2868 if (strcmp(tail, ":help") == 0) {
2869 fileStream stream(defaultStream::output_stream());
2870 LogConfiguration::print_command_line_help(&stream);
2871 vm_exit(0);
2872 } else if (strcmp(tail, ":disable") == 0) {
2873 LogConfiguration::disable_logging();
2874 ret = true;
2875 } else if (*tail == '\0') {
2876 ret = LogConfiguration::parse_command_line_arguments();
2877 assert(ret, "-Xlog without arguments should never fail to parse");
2878 } else if (*tail == ':') {
2879 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2880 }
2881 if (ret == false) {
2882 jio_fprintf(defaultStream::error_stream(),
2883 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2884 tail);
2885 return JNI_EINVAL;
2886 }
2887 // JNI hooks
2888 } else if (match_option(option, "-Xcheck", &tail)) {
2889 if (!strcmp(tail, ":jni")) {
2890 #if !INCLUDE_JNI_CHECK
2891 warning("JNI CHECKING is not supported in this VM");
2892 #else
2893 CheckJNICalls = true;
2894 #endif // INCLUDE_JNI_CHECK
2895 } else if (is_bad_option(option, args->ignoreUnrecognized,
2896 "check")) {
2897 return JNI_EINVAL;
2898 }
2899 } else if (match_option(option, "vfprintf")) {
2900 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2901 } else if (match_option(option, "exit")) {
2902 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2903 } else if (match_option(option, "abort")) {
2904 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2905 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2906 // and the last option wins.
2907 } else if (match_option(option, "-XX:+NeverTenure")) {
2908 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2909 return JNI_EINVAL;
2910 }
2911 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2918 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2922 return JNI_EINVAL;
2923 }
2924 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2928 uintx max_tenuring_thresh = 0;
2929 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2930 jio_fprintf(defaultStream::error_stream(),
2931 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2932 return JNI_EINVAL;
2933 }
2934
2935 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2936 return JNI_EINVAL;
2937 }
2938
2939 if (MaxTenuringThreshold == 0) {
2940 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 } else {
2947 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 }
2954 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2955 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2962 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2966 return JNI_EINVAL;
2967 }
2968 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2969 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2973 return JNI_EINVAL;
2974 }
2975 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2976 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2977 return JNI_EINVAL;
2978 }
2979 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2980 return JNI_EINVAL;
2981 }
2982 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2983 #if defined(DTRACE_ENABLED)
2984 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2985 return JNI_EINVAL;
2986 }
2987 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2994 return JNI_EINVAL;
2995 }
2996 #else // defined(DTRACE_ENABLED)
2997 jio_fprintf(defaultStream::error_stream(),
2998 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2999 return JNI_EINVAL;
3000 #endif // defined(DTRACE_ENABLED)
3001 #ifdef ASSERT
3002 } else if (match_option(option, "-XX:+FullGCALot")) {
3003 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 // disable scavenge before parallel mark-compact
3007 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 #endif
3011 #if !INCLUDE_MANAGEMENT
3012 } else if (match_option(option, "-XX:+ManagementServer")) {
3013 jio_fprintf(defaultStream::error_stream(),
3014 "ManagementServer is not supported in this VM.\n");
3015 return JNI_ERR;
3016 #endif // INCLUDE_MANAGEMENT
3017 #if INCLUDE_JFR
3018 } else if (match_jfr_option(&option)) {
3019 return JNI_EINVAL;
3020 #endif
3021 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3022 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3023 // already been handled
3024 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3025 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3026 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3027 return JNI_EINVAL;
3028 }
3029 }
3030 // Unknown option
3031 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3032 return JNI_ERR;
3033 }
3034 }
3035
3036 if (EnableValhalla) {
3037 if (!create_property("valhalla.enableValhalla", "true", InternalProperty)) {
3038 return JNI_ENOMEM;
3039 }
3040 }
3041
3042 // PrintSharedArchiveAndExit will turn on
3043 // -Xshare:on
3044 // -Xlog:class+path=info
3045 if (PrintSharedArchiveAndExit) {
3046 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3050 return JNI_EINVAL;
3051 }
3052 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3053 }
3054
3055 fix_appclasspath();
3056
3057 return JNI_OK;
3058 }
3059
3060 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3061 // For java.base check for duplicate --patch-module options being specified on the command line.
3062 // This check is only required for java.base, all other duplicate module specifications
3063 // will be checked during module system initialization. The module system initialization
3064 // will throw an ExceptionInInitializerError if this situation occurs.
3065 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3066 if (*patch_mod_javabase) {
3067 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3068 } else {
3069 *patch_mod_javabase = true;
3070 }
3071 }
3072
3073 // Create GrowableArray lazily, only if --patch-module has been specified
3074 if (_patch_mod_prefix == NULL) {
3075 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3076 }
3077
3078 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3079 }
3080
3081 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3082 //
3083 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3084 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3085 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3086 // path is treated as the current directory.
3087 //
3088 // This causes problems with CDS, which requires that all directories specified in the classpath
3089 // must be empty. In most cases, applications do NOT want to load classes from the current
3090 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3091 // scripts compatible with CDS.
3092 void Arguments::fix_appclasspath() {
3093 if (IgnoreEmptyClassPaths) {
3094 const char separator = *os::path_separator();
3095 const char* src = _java_class_path->value();
3096
3097 // skip over all the leading empty paths
3098 while (*src == separator) {
3099 src ++;
3100 }
3101
3102 char* copy = os::strdup_check_oom(src, mtArguments);
3103
3104 // trim all trailing empty paths
3105 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3106 *tail = '\0';
3107 }
3108
3109 char from[3] = {separator, separator, '\0'};
3110 char to [2] = {separator, '\0'};
3111 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3112 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3113 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3114 }
3115
3116 _java_class_path->set_writeable_value(copy);
3117 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3118 }
3119 }
3120
3121 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3122 // check if the default lib/endorsed directory exists; if so, error
3123 char path[JVM_MAXPATHLEN];
3124 const char* fileSep = os::file_separator();
3125 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3126
3127 DIR* dir = os::opendir(path);
3128 if (dir != NULL) {
3129 jio_fprintf(defaultStream::output_stream(),
3130 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3131 "in modular form will be supported via the concept of upgradeable modules.\n");
3132 os::closedir(dir);
3133 return JNI_ERR;
3134 }
3135
3136 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3137 dir = os::opendir(path);
3138 if (dir != NULL) {
3139 jio_fprintf(defaultStream::output_stream(),
3140 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3141 "Use -classpath instead.\n.");
3142 os::closedir(dir);
3143 return JNI_ERR;
3144 }
3145
3146 // This must be done after all arguments have been processed
3147 // and the container support has been initialized since AggressiveHeap
3148 // relies on the amount of total memory available.
3149 if (AggressiveHeap) {
3150 jint result = set_aggressive_heap_flags();
3151 if (result != JNI_OK) {
3152 return result;
3153 }
3154 }
3155
3156 // This must be done after all arguments have been processed.
3157 // java_compiler() true means set to "NONE" or empty.
3158 if (java_compiler() && !xdebug_mode()) {
3159 // For backwards compatibility, we switch to interpreted mode if
3160 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3161 // not specified.
3162 set_mode_flags(_int);
3163 }
3164
3165 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3166 // but like -Xint, leave compilation thresholds unaffected.
3167 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3168 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3169 set_mode_flags(_int);
3170 }
3171
3172 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3173 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3174 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3175 }
3176
3177 #if !COMPILER2_OR_JVMCI
3178 // Don't degrade server performance for footprint
3179 if (FLAG_IS_DEFAULT(UseLargePages) &&
3180 MaxHeapSize < LargePageHeapSizeThreshold) {
3181 // No need for large granularity pages w/small heaps.
3182 // Note that large pages are enabled/disabled for both the
3183 // Java heap and the code cache.
3184 FLAG_SET_DEFAULT(UseLargePages, false);
3185 }
3186
3187 UNSUPPORTED_OPTION(ProfileInterpreter);
3188 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3189 #endif
3190
3191 #ifndef TIERED
3192 // Tiered compilation is undefined.
3193 UNSUPPORTED_OPTION(TieredCompilation);
3194 #endif
3195
3196 if (!check_vm_args_consistency()) {
3197 return JNI_ERR;
3198 }
3199
3200 #if INCLUDE_CDS
3201 if (DumpSharedSpaces) {
3202 // Disable biased locking now as it interferes with the clean up of
3203 // the archived Klasses and Java string objects (at dump time only).
3204 UseBiasedLocking = false;
3205
3206 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3207 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3208 // compiler just to be safe.
3209 //
3210 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3211 // instead of modifying them in place. The copy is inaccessible to the compiler.
3212 // TODO: revisit the following for the static archive case.
3213 set_mode_flags(_int);
3214 }
3215 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3216 // Always verify non-system classes during CDS dump
3217 if (!BytecodeVerificationRemote) {
3218 BytecodeVerificationRemote = true;
3219 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3220 }
3221 }
3222 if (ArchiveClassesAtExit == NULL) {
3223 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3224 }
3225 if (UseSharedSpaces && patch_mod_javabase) {
3226 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3227 }
3228 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3229 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3230 }
3231 #endif
3232
3233 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3234 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3235 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3236
3237 return JNI_OK;
3238 }
3239
3240 // Helper class for controlling the lifetime of JavaVMInitArgs
3241 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3242 // deleted on the destruction of the ScopedVMInitArgs object.
3243 class ScopedVMInitArgs : public StackObj {
3244 private:
3245 JavaVMInitArgs _args;
3246 char* _container_name;
3247 bool _is_set;
3248 char* _vm_options_file_arg;
3249
3250 public:
3251 ScopedVMInitArgs(const char *container_name) {
3252 _args.version = JNI_VERSION_1_2;
3253 _args.nOptions = 0;
3254 _args.options = NULL;
3255 _args.ignoreUnrecognized = false;
3256 _container_name = (char *)container_name;
3257 _is_set = false;
3258 _vm_options_file_arg = NULL;
3259 }
3260
3261 // Populates the JavaVMInitArgs object represented by this
3262 // ScopedVMInitArgs object with the arguments in options. The
3263 // allocated memory is deleted by the destructor. If this method
3264 // returns anything other than JNI_OK, then this object is in a
3265 // partially constructed state, and should be abandoned.
3266 jint set_args(GrowableArray<JavaVMOption>* options) {
3267 _is_set = true;
3268 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3269 JavaVMOption, options->length(), mtArguments);
3270 if (options_arr == NULL) {
3271 return JNI_ENOMEM;
3272 }
3273 _args.options = options_arr;
3274
3275 for (int i = 0; i < options->length(); i++) {
3276 options_arr[i] = options->at(i);
3277 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3278 if (options_arr[i].optionString == NULL) {
3279 // Rely on the destructor to do cleanup.
3280 _args.nOptions = i;
3281 return JNI_ENOMEM;
3282 }
3283 }
3284
3285 _args.nOptions = options->length();
3286 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3287 return JNI_OK;
3288 }
3289
3290 JavaVMInitArgs* get() { return &_args; }
3291 char* container_name() { return _container_name; }
3292 bool is_set() { return _is_set; }
3293 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3294 char* vm_options_file_arg() { return _vm_options_file_arg; }
3295
3296 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3297 if (_vm_options_file_arg != NULL) {
3298 os::free(_vm_options_file_arg);
3299 }
3300 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3301 }
3302
3303 ~ScopedVMInitArgs() {
3304 if (_vm_options_file_arg != NULL) {
3305 os::free(_vm_options_file_arg);
3306 }
3307 if (_args.options == NULL) return;
3308 for (int i = 0; i < _args.nOptions; i++) {
3309 os::free(_args.options[i].optionString);
3310 }
3311 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3312 }
3313
3314 // Insert options into this option list, to replace option at
3315 // vm_options_file_pos (-XX:VMOptionsFile)
3316 jint insert(const JavaVMInitArgs* args,
3317 const JavaVMInitArgs* args_to_insert,
3318 const int vm_options_file_pos) {
3319 assert(_args.options == NULL, "shouldn't be set yet");
3320 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3321 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3322
3323 int length = args->nOptions + args_to_insert->nOptions - 1;
3324 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3325 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3326 for (int i = 0; i < args->nOptions; i++) {
3327 if (i == vm_options_file_pos) {
3328 // insert the new options starting at the same place as the
3329 // -XX:VMOptionsFile option
3330 for (int j = 0; j < args_to_insert->nOptions; j++) {
3331 options->push(args_to_insert->options[j]);
3332 }
3333 } else {
3334 options->push(args->options[i]);
3335 }
3336 }
3337 // make into options array
3338 jint result = set_args(options);
3339 delete options;
3340 return result;
3341 }
3342 };
3343
3344 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3345 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3346 }
3347
3348 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3349 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3350 }
3351
3352 jint Arguments::parse_options_environment_variable(const char* name,
3353 ScopedVMInitArgs* vm_args) {
3354 char *buffer = ::getenv(name);
3355
3356 // Don't check this environment variable if user has special privileges
3357 // (e.g. unix su command).
3358 if (buffer == NULL || os::have_special_privileges()) {
3359 return JNI_OK;
3360 }
3361
3362 if ((buffer = os::strdup(buffer)) == NULL) {
3363 return JNI_ENOMEM;
3364 }
3365
3366 jio_fprintf(defaultStream::error_stream(),
3367 "Picked up %s: %s\n", name, buffer);
3368
3369 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3370
3371 os::free(buffer);
3372 return retcode;
3373 }
3374
3375 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3376 // read file into buffer
3377 int fd = ::open(file_name, O_RDONLY);
3378 if (fd < 0) {
3379 jio_fprintf(defaultStream::error_stream(),
3380 "Could not open options file '%s'\n",
3381 file_name);
3382 return JNI_ERR;
3383 }
3384
3385 struct stat stbuf;
3386 int retcode = os::stat(file_name, &stbuf);
3387 if (retcode != 0) {
3388 jio_fprintf(defaultStream::error_stream(),
3389 "Could not stat options file '%s'\n",
3390 file_name);
3391 os::close(fd);
3392 return JNI_ERR;
3393 }
3394
3395 if (stbuf.st_size == 0) {
3396 // tell caller there is no option data and that is ok
3397 os::close(fd);
3398 return JNI_OK;
3399 }
3400
3401 // '+ 1' for NULL termination even with max bytes
3402 size_t bytes_alloc = stbuf.st_size + 1;
3403
3404 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3405 if (NULL == buf) {
3406 jio_fprintf(defaultStream::error_stream(),
3407 "Could not allocate read buffer for options file parse\n");
3408 os::close(fd);
3409 return JNI_ENOMEM;
3410 }
3411
3412 memset(buf, 0, bytes_alloc);
3413
3414 // Fill buffer
3415 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3416 os::close(fd);
3417 if (bytes_read < 0) {
3418 FREE_C_HEAP_ARRAY(char, buf);
3419 jio_fprintf(defaultStream::error_stream(),
3420 "Could not read options file '%s'\n", file_name);
3421 return JNI_ERR;
3422 }
3423
3424 if (bytes_read == 0) {
3425 // tell caller there is no option data and that is ok
3426 FREE_C_HEAP_ARRAY(char, buf);
3427 return JNI_OK;
3428 }
3429
3430 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3431
3432 FREE_C_HEAP_ARRAY(char, buf);
3433 return retcode;
3434 }
3435
3436 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3437 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3438
3439 // some pointers to help with parsing
3440 char *buffer_end = buffer + buf_len;
3441 char *opt_hd = buffer;
3442 char *wrt = buffer;
3443 char *rd = buffer;
3444
3445 // parse all options
3446 while (rd < buffer_end) {
3447 // skip leading white space from the input string
3448 while (rd < buffer_end && isspace(*rd)) {
3449 rd++;
3450 }
3451
3452 if (rd >= buffer_end) {
3453 break;
3454 }
3455
3456 // Remember this is where we found the head of the token.
3457 opt_hd = wrt;
3458
3459 // Tokens are strings of non white space characters separated
3460 // by one or more white spaces.
3461 while (rd < buffer_end && !isspace(*rd)) {
3462 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3463 int quote = *rd; // matching quote to look for
3464 rd++; // don't copy open quote
3465 while (rd < buffer_end && *rd != quote) {
3466 // include everything (even spaces)
3467 // up until the close quote
3468 *wrt++ = *rd++; // copy to option string
3469 }
3470
3471 if (rd < buffer_end) {
3472 rd++; // don't copy close quote
3473 } else {
3474 // did not see closing quote
3475 jio_fprintf(defaultStream::error_stream(),
3476 "Unmatched quote in %s\n", name);
3477 delete options;
3478 return JNI_ERR;
3479 }
3480 } else {
3481 *wrt++ = *rd++; // copy to option string
3482 }
3483 }
3484
3485 // steal a white space character and set it to NULL
3486 *wrt++ = '\0';
3487 // We now have a complete token
3488
3489 JavaVMOption option;
3490 option.optionString = opt_hd;
3491 option.extraInfo = NULL;
3492
3493 options->append(option); // Fill in option
3494
3495 rd++; // Advance to next character
3496 }
3497
3498 // Fill out JavaVMInitArgs structure.
3499 jint status = vm_args->set_args(options);
3500
3501 delete options;
3502 return status;
3503 }
3504
3505 void Arguments::set_shared_spaces_flags() {
3506 if (DumpSharedSpaces) {
3507 if (RequireSharedSpaces) {
3508 warning("Cannot dump shared archive while using shared archive");
3509 }
3510 UseSharedSpaces = false;
3511 #ifdef _LP64
3512 if (!UseCompressedOops || !UseCompressedClassPointers) {
3513 vm_exit_during_initialization(
3514 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3515 }
3516 } else {
3517 if (!UseCompressedOops || !UseCompressedClassPointers) {
3518 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3519 }
3520 #endif
3521 }
3522 }
3523
3524 #if INCLUDE_CDS
3525 // Sharing support
3526 // Construct the path to the archive
3527 char* Arguments::get_default_shared_archive_path() {
3528 char *default_archive_path;
3529 char jvm_path[JVM_MAXPATHLEN];
3530 os::jvm_path(jvm_path, sizeof(jvm_path));
3531 char *end = strrchr(jvm_path, *os::file_separator());
3532 if (end != NULL) *end = '\0';
3533 size_t jvm_path_len = strlen(jvm_path);
3534 size_t file_sep_len = strlen(os::file_separator());
3535 const size_t len = jvm_path_len + file_sep_len + 20;
3536 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3537 if (default_archive_path != NULL) {
3538 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3539 jvm_path, os::file_separator());
3540 }
3541 return default_archive_path;
3542 }
3543
3544 int Arguments::num_archives(const char* archive_path) {
3545 if (archive_path == NULL) {
3546 return 0;
3547 }
3548 int npaths = 1;
3549 char* p = (char*)archive_path;
3550 while (*p != '\0') {
3551 if (*p == os::path_separator()[0]) {
3552 npaths++;
3553 }
3554 p++;
3555 }
3556 return npaths;
3557 }
3558
3559 void Arguments::extract_shared_archive_paths(const char* archive_path,
3560 char** base_archive_path,
3561 char** top_archive_path) {
3562 char* begin_ptr = (char*)archive_path;
3563 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3564 if (end_ptr == NULL || end_ptr == begin_ptr) {
3565 vm_exit_during_initialization("Base archive was not specified", archive_path);
3566 }
3567 size_t len = end_ptr - begin_ptr;
3568 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3569 strncpy(cur_path, begin_ptr, len);
3570 cur_path[len] = '\0';
3571 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3572 *base_archive_path = cur_path;
3573
3574 begin_ptr = ++end_ptr;
3575 if (*begin_ptr == '\0') {
3576 vm_exit_during_initialization("Top archive was not specified", archive_path);
3577 }
3578 end_ptr = strchr(begin_ptr, '\0');
3579 assert(end_ptr != NULL, "sanity");
3580 len = end_ptr - begin_ptr;
3581 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3582 strncpy(cur_path, begin_ptr, len + 1);
3583 //cur_path[len] = '\0';
3584 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3585 *top_archive_path = cur_path;
3586 }
3587
3588 bool Arguments::init_shared_archive_paths() {
3589 if (ArchiveClassesAtExit != NULL) {
3590 if (DumpSharedSpaces) {
3591 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3592 }
3593 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3594 return false;
3595 }
3596 check_unsupported_dumping_properties();
3597 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3598 }
3599 if (SharedArchiveFile == NULL) {
3600 SharedArchivePath = get_default_shared_archive_path();
3601 } else {
3602 int archives = num_archives(SharedArchiveFile);
3603 if (DynamicDumpSharedSpaces || DumpSharedSpaces) {
3604 if (archives > 1) {
3605 vm_exit_during_initialization(
3606 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3607 }
3608 if (DynamicDumpSharedSpaces) {
3609 if (FileMapInfo::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3610 vm_exit_during_initialization(
3611 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3612 SharedArchiveFile);
3613 }
3614 }
3615 }
3616 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){
3617 if (archives > 2) {
3618 vm_exit_during_initialization(
3619 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3620 }
3621 if (archives == 1) {
3622 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3623 int name_size;
3624 bool success =
3625 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3626 if (!success) {
3627 SharedArchivePath = temp_archive_path;
3628 } else {
3629 SharedDynamicArchivePath = temp_archive_path;
3630 }
3631 } else {
3632 extract_shared_archive_paths((const char*)SharedArchiveFile,
3633 &SharedArchivePath, &SharedDynamicArchivePath);
3634 }
3635 } else { // CDS dumping
3636 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3637 }
3638 }
3639 return (SharedArchivePath != NULL);
3640 }
3641 #endif // INCLUDE_CDS
3642
3643 #ifndef PRODUCT
3644 // Determine whether LogVMOutput should be implicitly turned on.
3645 static bool use_vm_log() {
3646 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3647 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3648 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3649 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3650 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3651 return true;
3652 }
3653
3654 #ifdef COMPILER1
3655 if (PrintC1Statistics) {
3656 return true;
3657 }
3658 #endif // COMPILER1
3659
3660 #ifdef COMPILER2
3661 if (PrintOptoAssembly || PrintOptoStatistics) {
3662 return true;
3663 }
3664 #endif // COMPILER2
3665
3666 return false;
3667 }
3668
3669 #endif // PRODUCT
3670
3671 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3672 for (int index = 0; index < args->nOptions; index++) {
3673 const JavaVMOption* option = args->options + index;
3674 const char* tail;
3675 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3676 return true;
3677 }
3678 }
3679 return false;
3680 }
3681
3682 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3683 const char* vm_options_file,
3684 const int vm_options_file_pos,
3685 ScopedVMInitArgs* vm_options_file_args,
3686 ScopedVMInitArgs* args_out) {
3687 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3688 if (code != JNI_OK) {
3689 return code;
3690 }
3691
3692 if (vm_options_file_args->get()->nOptions < 1) {
3693 return JNI_OK;
3694 }
3695
3696 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3697 jio_fprintf(defaultStream::error_stream(),
3698 "A VM options file may not refer to a VM options file. "
3699 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3700 "options file '%s' in options container '%s' is an error.\n",
3701 vm_options_file_args->vm_options_file_arg(),
3702 vm_options_file_args->container_name());
3703 return JNI_EINVAL;
3704 }
3705
3706 return args_out->insert(args, vm_options_file_args->get(),
3707 vm_options_file_pos);
3708 }
3709
3710 // Expand -XX:VMOptionsFile found in args_in as needed.
3711 // mod_args and args_out parameters may return values as needed.
3712 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3713 ScopedVMInitArgs* mod_args,
3714 JavaVMInitArgs** args_out) {
3715 jint code = match_special_option_and_act(args_in, mod_args);
3716 if (code != JNI_OK) {
3717 return code;
3718 }
3719
3720 if (mod_args->is_set()) {
3721 // args_in contains -XX:VMOptionsFile and mod_args contains the
3722 // original options from args_in along with the options expanded
3723 // from the VMOptionsFile. Return a short-hand to the caller.
3724 *args_out = mod_args->get();
3725 } else {
3726 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3727 }
3728 return JNI_OK;
3729 }
3730
3731 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3732 ScopedVMInitArgs* args_out) {
3733 // Remaining part of option string
3734 const char* tail;
3735 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3736
3737 for (int index = 0; index < args->nOptions; index++) {
3738 const JavaVMOption* option = args->options + index;
3739 if (match_option(option, "-XX:Flags=", &tail)) {
3740 Arguments::set_jvm_flags_file(tail);
3741 continue;
3742 }
3743 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3744 if (vm_options_file_args.found_vm_options_file_arg()) {
3745 jio_fprintf(defaultStream::error_stream(),
3746 "The option '%s' is already specified in the options "
3747 "container '%s' so the specification of '%s' in the "
3748 "same options container is an error.\n",
3749 vm_options_file_args.vm_options_file_arg(),
3750 vm_options_file_args.container_name(),
3751 option->optionString);
3752 return JNI_EINVAL;
3753 }
3754 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3755 // If there's a VMOptionsFile, parse that
3756 jint code = insert_vm_options_file(args, tail, index,
3757 &vm_options_file_args, args_out);
3758 if (code != JNI_OK) {
3759 return code;
3760 }
3761 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3762 if (args_out->is_set()) {
3763 // The VMOptions file inserted some options so switch 'args'
3764 // to the new set of options, and continue processing which
3765 // preserves "last option wins" semantics.
3766 args = args_out->get();
3767 // The first option from the VMOptionsFile replaces the
3768 // current option. So we back track to process the
3769 // replacement option.
3770 index--;
3771 }
3772 continue;
3773 }
3774 if (match_option(option, "-XX:+PrintVMOptions")) {
3775 PrintVMOptions = true;
3776 continue;
3777 }
3778 if (match_option(option, "-XX:-PrintVMOptions")) {
3779 PrintVMOptions = false;
3780 continue;
3781 }
3782 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3783 IgnoreUnrecognizedVMOptions = true;
3784 continue;
3785 }
3786 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3787 IgnoreUnrecognizedVMOptions = false;
3788 continue;
3789 }
3790 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3791 JVMFlag::printFlags(tty, false);
3792 vm_exit(0);
3793 }
3794 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3795 #if INCLUDE_NMT
3796 // The launcher did not setup nmt environment variable properly.
3797 if (!MemTracker::check_launcher_nmt_support(tail)) {
3798 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3799 }
3800
3801 // Verify if nmt option is valid.
3802 if (MemTracker::verify_nmt_option()) {
3803 // Late initialization, still in single-threaded mode.
3804 if (MemTracker::tracking_level() >= NMT_summary) {
3805 MemTracker::init();
3806 }
3807 } else {
3808 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3809 }
3810 continue;
3811 #else
3812 jio_fprintf(defaultStream::error_stream(),
3813 "Native Memory Tracking is not supported in this VM\n");
3814 return JNI_ERR;
3815 #endif
3816 }
3817
3818 #ifndef PRODUCT
3819 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3820 JVMFlag::printFlags(tty, true);
3821 vm_exit(0);
3822 }
3823 #endif
3824 }
3825 return JNI_OK;
3826 }
3827
3828 static void print_options(const JavaVMInitArgs *args) {
3829 const char* tail;
3830 for (int index = 0; index < args->nOptions; index++) {
3831 const JavaVMOption *option = args->options + index;
3832 if (match_option(option, "-XX:", &tail)) {
3833 logOption(tail);
3834 }
3835 }
3836 }
3837
3838 bool Arguments::handle_deprecated_print_gc_flags() {
3839 if (PrintGC) {
3840 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3841 }
3842 if (PrintGCDetails) {
3843 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3844 }
3845
3846 if (_gc_log_filename != NULL) {
3847 // -Xloggc was used to specify a filename
3848 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3849
3850 LogTarget(Error, logging) target;
3851 LogStream errstream(target);
3852 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3853 } else if (PrintGC || PrintGCDetails) {
3854 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3855 }
3856 return true;
3857 }
3858
3859 void Arguments::handle_extra_cms_flags(const char* msg) {
3860 SpecialFlag flag;
3861 const char *flag_name = "UseConcMarkSweepGC";
3862 if (lookup_special_flag(flag_name, flag)) {
3863 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3864 warning("%s", msg);
3865 }
3866 }
3867
3868 // Parse entry point called from JNI_CreateJavaVM
3869
3870 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3871 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3872
3873 // Initialize ranges, constraints and writeables
3874 JVMFlagRangeList::init();
3875 JVMFlagConstraintList::init();
3876 JVMFlagWriteableList::init();
3877
3878 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3879 const char* hotspotrc = ".hotspotrc";
3880 bool settings_file_specified = false;
3881 bool needs_hotspotrc_warning = false;
3882 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3883 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3884
3885 // Pointers to current working set of containers
3886 JavaVMInitArgs* cur_cmd_args;
3887 JavaVMInitArgs* cur_java_options_args;
3888 JavaVMInitArgs* cur_java_tool_options_args;
3889
3890 // Containers for modified/expanded options
3891 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3892 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3893 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3894
3895
3896 jint code =
3897 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3898 if (code != JNI_OK) {
3899 return code;
3900 }
3901
3902 code = parse_java_options_environment_variable(&initial_java_options_args);
3903 if (code != JNI_OK) {
3904 return code;
3905 }
3906
3907 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3908 &mod_java_tool_options_args,
3909 &cur_java_tool_options_args);
3910 if (code != JNI_OK) {
3911 return code;
3912 }
3913
3914 code = expand_vm_options_as_needed(initial_cmd_args,
3915 &mod_cmd_args,
3916 &cur_cmd_args);
3917 if (code != JNI_OK) {
3918 return code;
3919 }
3920
3921 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3922 &mod_java_options_args,
3923 &cur_java_options_args);
3924 if (code != JNI_OK) {
3925 return code;
3926 }
3927
3928 const char* flags_file = Arguments::get_jvm_flags_file();
3929 settings_file_specified = (flags_file != NULL);
3930
3931 if (IgnoreUnrecognizedVMOptions) {
3932 cur_cmd_args->ignoreUnrecognized = true;
3933 cur_java_tool_options_args->ignoreUnrecognized = true;
3934 cur_java_options_args->ignoreUnrecognized = true;
3935 }
3936
3937 // Parse specified settings file
3938 if (settings_file_specified) {
3939 if (!process_settings_file(flags_file, true,
3940 cur_cmd_args->ignoreUnrecognized)) {
3941 return JNI_EINVAL;
3942 }
3943 } else {
3944 #ifdef ASSERT
3945 // Parse default .hotspotrc settings file
3946 if (!process_settings_file(".hotspotrc", false,
3947 cur_cmd_args->ignoreUnrecognized)) {
3948 return JNI_EINVAL;
3949 }
3950 #else
3951 struct stat buf;
3952 if (os::stat(hotspotrc, &buf) == 0) {
3953 needs_hotspotrc_warning = true;
3954 }
3955 #endif
3956 }
3957
3958 if (PrintVMOptions) {
3959 print_options(cur_java_tool_options_args);
3960 print_options(cur_cmd_args);
3961 print_options(cur_java_options_args);
3962 }
3963
3964 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3965 jint result = parse_vm_init_args(cur_java_tool_options_args,
3966 cur_java_options_args,
3967 cur_cmd_args);
3968
3969 if (result != JNI_OK) {
3970 return result;
3971 }
3972
3973 #if INCLUDE_CDS
3974 // Initialize shared archive paths which could include both base and dynamic archive paths
3975 if (!init_shared_archive_paths()) {
3976 return JNI_ENOMEM;
3977 }
3978 #endif
3979
3980 // Delay warning until here so that we've had a chance to process
3981 // the -XX:-PrintWarnings flag
3982 if (needs_hotspotrc_warning) {
3983 warning("%s file is present but has been ignored. "
3984 "Run with -XX:Flags=%s to load the file.",
3985 hotspotrc, hotspotrc);
3986 }
3987
3988 if (needs_module_property_warning) {
3989 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3990 " names that are reserved for internal use.");
3991 }
3992
3993 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3994 UNSUPPORTED_OPTION(UseLargePages);
3995 #endif
3996
3997 #if defined(AIX)
3998 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3999 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
4000 #endif
4001
4002 #ifndef PRODUCT
4003 if (TraceBytecodesAt != 0) {
4004 TraceBytecodes = true;
4005 }
4006 if (CountCompiledCalls) {
4007 if (UseCounterDecay) {
4008 warning("UseCounterDecay disabled because CountCalls is set");
4009 UseCounterDecay = false;
4010 }
4011 }
4012 #endif // PRODUCT
4013
4014 if (ScavengeRootsInCode == 0) {
4015 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4016 warning("Forcing ScavengeRootsInCode non-zero");
4017 }
4018 ScavengeRootsInCode = 1;
4019 }
4020
4021 if (!handle_deprecated_print_gc_flags()) {
4022 return JNI_EINVAL;
4023 }
4024
4025 // Set object alignment values.
4026 set_object_alignment();
4027
4028 #if !INCLUDE_CDS
4029 if (DumpSharedSpaces || RequireSharedSpaces) {
4030 jio_fprintf(defaultStream::error_stream(),
4031 "Shared spaces are not supported in this VM\n");
4032 return JNI_ERR;
4033 }
4034 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4035 log_is_enabled(Info, cds)) {
4036 warning("Shared spaces are not supported in this VM");
4037 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4038 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4039 }
4040 no_shared_spaces("CDS Disabled");
4041 #endif // INCLUDE_CDS
4042
4043 return JNI_OK;
4044 }
4045
4046 jint Arguments::apply_ergo() {
4047 // Set flags based on ergonomics.
4048 jint result = set_ergonomics_flags();
4049 if (result != JNI_OK) return result;
4050
4051 // Set heap size based on available physical memory
4052 set_heap_size();
4053
4054 GCConfig::arguments()->initialize();
4055
4056 set_shared_spaces_flags();
4057
4058 // Initialize Metaspace flags and alignments
4059 Metaspace::ergo_initialize();
4060
4061 // Set compiler flags after GC is selected and GC specific
4062 // flags (LoopStripMiningIter) are set.
4063 CompilerConfig::ergo_initialize();
4064
4065 // Set bytecode rewriting flags
4066 set_bytecode_flags();
4067
4068 // Set flags if aggressive optimization flags are enabled
4069 jint code = set_aggressive_opts_flags();
4070 if (code != JNI_OK) {
4071 return code;
4072 }
4073
4074 // Turn off biased locking for locking debug mode flags,
4075 // which are subtly different from each other but neither works with
4076 // biased locking
4077 if (UseHeavyMonitors
4078 #ifdef COMPILER1
4079 || !UseFastLocking
4080 #endif // COMPILER1
4081 #if INCLUDE_JVMCI
4082 || !JVMCIUseFastLocking
4083 #endif
4084 ) {
4085 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4086 // flag set to true on command line; warn the user that they
4087 // can't enable biased locking here
4088 warning("Biased Locking is not supported with locking debug flags"
4089 "; ignoring UseBiasedLocking flag." );
4090 }
4091 UseBiasedLocking = false;
4092 }
4093
4094 #ifdef CC_INTERP
4095 // Clear flags not supported on zero.
4096 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4097 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4098 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4099 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4100 #endif // CC_INTERP
4101
4102 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4103 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4104 DebugNonSafepoints = true;
4105 }
4106
4107 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4108 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4109 }
4110
4111 // Treat the odd case where local verification is enabled but remote
4112 // verification is not as if both were enabled.
4113 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4114 log_info(verification)("Turning on remote verification because local verification is on");
4115 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4116 }
4117 if (!EnableValhalla || is_interpreter_only()) {
4118 // Disable calling convention optimizations if value types are not supported
4119 ValueTypePassFieldsAsArgs = false;
4120 ValueTypeReturnedAsFields = false;
4121 }
4122
4123 #ifndef PRODUCT
4124 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4125 if (use_vm_log()) {
4126 LogVMOutput = true;
4127 }
4128 }
4129 #endif // PRODUCT
4130
4131 if (PrintCommandLineFlags) {
4132 JVMFlag::printSetFlags(tty);
4133 }
4134
4135 // Apply CPU specific policy for the BiasedLocking
4136 if (UseBiasedLocking) {
4137 if (!VM_Version::use_biased_locking() &&
4138 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4139 UseBiasedLocking = false;
4140 }
4141 }
4142 #ifdef COMPILER2
4143 if (!UseBiasedLocking) {
4144 UseOptoBiasInlining = false;
4145 }
4146 #endif
4147
4148 #if defined(IA32)
4149 // Only server compiler can optimize safepoints well enough.
4150 if (!is_server_compilation_mode_vm()) {
4151 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false);
4152 }
4153 #endif
4154
4155 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4156 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4157 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4158 } else {
4159 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4160 }
4161
4162 return JNI_OK;
4163 }
4164
4165 jint Arguments::adjust_after_os() {
4166 if (UseNUMA) {
4167 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4168 FLAG_SET_ERGO(UseNUMA, false);
4169 } else if (UseParallelGC || UseParallelOldGC) {
4170 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4171 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4172 }
4173 }
4174 // UseNUMAInterleaving is set to ON for all collectors and
4175 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4176 // such as the parallel collector for Linux and Solaris will
4177 // interleave old gen and survivor spaces on top of NUMA
4178 // allocation policy for the eden space.
4179 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4180 // all platforms and ParallelGC on Windows will interleave all
4181 // of the heap spaces across NUMA nodes.
4182 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4183 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4184 }
4185 }
4186 return JNI_OK;
4187 }
4188
4189 int Arguments::PropertyList_count(SystemProperty* pl) {
4190 int count = 0;
4191 while(pl != NULL) {
4192 count++;
4193 pl = pl->next();
4194 }
4195 return count;
4196 }
4197
4198 // Return the number of readable properties.
4199 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4200 int count = 0;
4201 while(pl != NULL) {
4202 if (pl->is_readable()) {
4203 count++;
4204 }
4205 pl = pl->next();
4206 }
4207 return count;
4208 }
4209
4210 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4211 assert(key != NULL, "just checking");
4212 SystemProperty* prop;
4213 for (prop = pl; prop != NULL; prop = prop->next()) {
4214 if (strcmp(key, prop->key()) == 0) return prop->value();
4215 }
4216 return NULL;
4217 }
4218
4219 // Return the value of the requested property provided that it is a readable property.
4220 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4221 assert(key != NULL, "just checking");
4222 SystemProperty* prop;
4223 // Return the property value if the keys match and the property is not internal or
4224 // it's the special internal property "jdk.boot.class.path.append".
4225 for (prop = pl; prop != NULL; prop = prop->next()) {
4226 if (strcmp(key, prop->key()) == 0) {
4227 if (!prop->internal()) {
4228 return prop->value();
4229 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4230 return prop->value();
4231 } else {
4232 // Property is internal and not jdk.boot.class.path.append so return NULL.
4233 return NULL;
4234 }
4235 }
4236 }
4237 return NULL;
4238 }
4239
4240 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4241 int count = 0;
4242 const char* ret_val = NULL;
4243
4244 while(pl != NULL) {
4245 if(count >= index) {
4246 ret_val = pl->key();
4247 break;
4248 }
4249 count++;
4250 pl = pl->next();
4251 }
4252
4253 return ret_val;
4254 }
4255
4256 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4257 int count = 0;
4258 char* ret_val = NULL;
4259
4260 while(pl != NULL) {
4261 if(count >= index) {
4262 ret_val = pl->value();
4263 break;
4264 }
4265 count++;
4266 pl = pl->next();
4267 }
4268
4269 return ret_val;
4270 }
4271
4272 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4273 SystemProperty* p = *plist;
4274 if (p == NULL) {
4275 *plist = new_p;
4276 } else {
4277 while (p->next() != NULL) {
4278 p = p->next();
4279 }
4280 p->set_next(new_p);
4281 }
4282 }
4283
4284 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4285 bool writeable, bool internal) {
4286 if (plist == NULL)
4287 return;
4288
4289 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4290 PropertyList_add(plist, new_p);
4291 }
4292
4293 void Arguments::PropertyList_add(SystemProperty *element) {
4294 PropertyList_add(&_system_properties, element);
4295 }
4296
4297 // This add maintains unique property key in the list.
4298 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4299 PropertyAppendable append, PropertyWriteable writeable,
4300 PropertyInternal internal) {
4301 if (plist == NULL)
4302 return;
4303
4304 // If property key exist then update with new value.
4305 SystemProperty* prop;
4306 for (prop = *plist; prop != NULL; prop = prop->next()) {
4307 if (strcmp(k, prop->key()) == 0) {
4308 if (append == AppendProperty) {
4309 prop->append_value(v);
4310 } else {
4311 prop->set_value(v);
4312 }
4313 return;
4314 }
4315 }
4316
4317 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4318 }
4319
4320 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4321 // Returns true if all of the source pointed by src has been copied over to
4322 // the destination buffer pointed by buf. Otherwise, returns false.
4323 // Notes:
4324 // 1. If the length (buflen) of the destination buffer excluding the
4325 // NULL terminator character is not long enough for holding the expanded
4326 // pid characters, it also returns false instead of returning the partially
4327 // expanded one.
4328 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4329 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4330 char* buf, size_t buflen) {
4331 const char* p = src;
4332 char* b = buf;
4333 const char* src_end = &src[srclen];
4334 char* buf_end = &buf[buflen - 1];
4335
4336 while (p < src_end && b < buf_end) {
4337 if (*p == '%') {
4338 switch (*(++p)) {
4339 case '%': // "%%" ==> "%"
4340 *b++ = *p++;
4341 break;
4342 case 'p': { // "%p" ==> current process id
4343 // buf_end points to the character before the last character so
4344 // that we could write '\0' to the end of the buffer.
4345 size_t buf_sz = buf_end - b + 1;
4346 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4347
4348 // if jio_snprintf fails or the buffer is not long enough to hold
4349 // the expanded pid, returns false.
4350 if (ret < 0 || ret >= (int)buf_sz) {
4351 return false;
4352 } else {
4353 b += ret;
4354 assert(*b == '\0', "fail in copy_expand_pid");
4355 if (p == src_end && b == buf_end + 1) {
4356 // reach the end of the buffer.
4357 return true;
4358 }
4359 }
4360 p++;
4361 break;
4362 }
4363 default :
4364 *b++ = '%';
4365 }
4366 } else {
4367 *b++ = *p++;
4368 }
4369 }
4370 *b = '\0';
4371 return (p == src_end); // return false if not all of the source was copied
4372 }