1 /*
2 * Copyright (c) 1997, 2020, 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/jvmFlagRangeList.hpp"
46 #include "runtime/globals_extension.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/os.inline.hpp"
49 #include "runtime/safepoint.hpp"
50 #include "runtime/safepointMechanism.hpp"
51 #include "runtime/vm_version.hpp"
52 #include "services/management.hpp"
53 #include "services/memTracker.hpp"
54 #include "utilities/align.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/powerOfTwo.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JFR
60 #include "jfr/jfr.hpp"
61 #endif
62
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 char* Arguments::_jvm_flags_file = NULL;
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 size_t Arguments::_conservative_max_heap_alignment = 0;
74 Arguments::Mode Arguments::_mode = _mixed;
75 bool Arguments::_java_compiler = false;
76 bool Arguments::_xdebug_mode = false;
77 const char* Arguments::_java_vendor_url_bug = NULL;
78 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
79 bool Arguments::_sun_java_launcher_is_altjvm = false;
80
81 // These parameters are reset in method parse_vm_init_args()
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
87 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
88 size_t Arguments::_SharedBaseAddress = SharedBaseAddress;
89
90 bool Arguments::_enable_preview = false;
91
92 char* Arguments::SharedArchivePath = NULL;
93 char* Arguments::SharedDynamicArchivePath = NULL;
94
95 AgentLibraryList Arguments::_libraryList;
96 AgentLibraryList Arguments::_agentList;
97
98 // These are not set by the JDK's built-in launchers, but they can be set by
99 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
100 // JavaVMOption in jni.h.
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
111 SystemProperty *Arguments::_vm_info = NULL;
112
113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
114 PathString *Arguments::_system_boot_class_path = NULL;
115 bool Arguments::_has_jimage = false;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 bool PathString::set_value(const char *value) {
120 if (_value != NULL) {
121 FreeHeap(_value);
122 }
123 _value = AllocateHeap(strlen(value)+1, mtArguments);
124 assert(_value != NULL, "Unable to allocate space for new path value");
125 if (_value != NULL) {
126 strcpy(_value, value);
127 } else {
128 // not able to allocate
129 return false;
130 }
131 return true;
132 }
133
134 void PathString::append_value(const char *value) {
135 char *sp;
136 size_t len = 0;
137 if (value != NULL) {
138 len = strlen(value);
139 if (_value != NULL) {
140 len += strlen(_value);
141 }
142 sp = AllocateHeap(len+2, mtArguments);
143 assert(sp != NULL, "Unable to allocate space for new append path value");
144 if (sp != NULL) {
145 if (_value != NULL) {
146 strcpy(sp, _value);
147 strcat(sp, os::path_separator());
148 strcat(sp, value);
149 FreeHeap(_value);
150 } else {
151 strcpy(sp, value);
152 }
153 _value = sp;
154 }
155 }
156 }
157
158 PathString::PathString(const char* value) {
159 if (value == NULL) {
160 _value = NULL;
161 } else {
162 _value = AllocateHeap(strlen(value)+1, mtArguments);
163 strcpy(_value, value);
164 }
165 }
166
167 PathString::~PathString() {
168 if (_value != NULL) {
169 FreeHeap(_value);
170 _value = NULL;
171 }
172 }
173
174 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
175 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
176 size_t len = strlen(module_name) + 1;
177 _module_name = AllocateHeap(len, mtInternal);
178 strncpy(_module_name, module_name, len); // copy the trailing null
179 _path = new PathString(path);
180 }
181
182 ModulePatchPath::~ModulePatchPath() {
183 if (_module_name != NULL) {
184 FreeHeap(_module_name);
185 _module_name = NULL;
186 }
187 if (_path != NULL) {
188 delete _path;
189 _path = NULL;
190 }
191 }
192
193 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
194 if (key == NULL) {
195 _key = NULL;
196 } else {
197 _key = AllocateHeap(strlen(key)+1, mtArguments);
198 strcpy(_key, key);
199 }
200 _next = NULL;
201 _internal = internal;
202 _writeable = writeable;
203 }
204
205 AgentLibrary::AgentLibrary(const char* name, const char* options,
206 bool is_absolute_path, void* os_lib,
207 bool instrument_lib) {
208 _name = AllocateHeap(strlen(name)+1, mtArguments);
209 strcpy(_name, name);
210 if (options == NULL) {
211 _options = NULL;
212 } else {
213 _options = AllocateHeap(strlen(options)+1, mtArguments);
214 strcpy(_options, options);
215 }
216 _is_absolute_path = is_absolute_path;
217 _os_lib = os_lib;
218 _next = NULL;
219 _state = agent_invalid;
220 _is_static_lib = false;
221 _is_instrument_lib = instrument_lib;
222 }
223
224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
225 // part of the option string.
226 static bool match_option(const JavaVMOption *option, const char* name,
227 const char** tail) {
228 size_t len = strlen(name);
229 if (strncmp(option->optionString, name, len) == 0) {
230 *tail = option->optionString + len;
231 return true;
232 } else {
233 return false;
234 }
235 }
236
237 // Check if 'option' matches 'name'. No "tail" is allowed.
238 static bool match_option(const JavaVMOption *option, const char* name) {
239 const char* tail = NULL;
240 bool result = match_option(option, name, &tail);
241 if (tail != NULL && *tail == '\0') {
242 return result;
243 } else {
244 return false;
245 }
246 }
247
248 // Return true if any of the strings in null-terminated array 'names' matches.
249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
250 // the option must match exactly.
251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
252 bool tail_allowed) {
253 for (/* empty */; *names != NULL; ++names) {
254 if (match_option(option, *names, tail)) {
255 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
256 return true;
257 }
258 }
259 }
260 return false;
261 }
262
263 #if INCLUDE_JFR
264 static bool _has_jfr_option = false; // is using JFR
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != NULL, "invariant");
269 char* tail = NULL;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_start_flight_recording_option(option, tail);
273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_flight_recorder_option(option, tail);
276 }
277 return false;
278 }
279
280 bool Arguments::has_jfr_option() {
281 return _has_jfr_option;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
330 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
331 return ((strncmp(option, property, len) == 0) &&
332 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
333 }
334
335 // Return true if property starts with "jdk.module." and its ensuing chars match
336 // any of the reserved module properties.
337 // property should be passed without the leading "-D".
338 bool Arguments::is_internal_module_property(const char* property) {
339 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
340 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
341 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
342 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
343 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
344 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
345 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
346 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
348 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
349 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
350 return true;
351 }
352 }
353 return false;
354 }
355
356 // Process java launcher properties.
357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
359 // Must do this before setting up other system properties,
360 // as some of them may depend on launcher type.
361 for (int index = 0; index < args->nOptions; index++) {
362 const JavaVMOption* option = args->options + index;
363 const char* tail;
364
365 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
366 process_java_launcher_argument(tail, option->extraInfo);
367 continue;
368 }
369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
370 if (strcmp(tail, "true") == 0) {
371 _sun_java_launcher_is_altjvm = true;
372 }
373 continue;
374 }
375 }
376 }
377
378 // Initialize system properties key and value.
379 void Arguments::init_system_properties() {
380
381 // Set up _system_boot_class_path which is not a property but
382 // relies heavily on argument processing and the jdk.boot.class.path.append
383 // property. It is used to store the underlying system boot class path.
384 _system_boot_class_path = new PathString(NULL);
385
386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
387 "Java Virtual Machine Specification", false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
391
392 // Initialize the vm.info now, but it will need updating after argument parsing.
393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to NULL and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
399 _java_library_path = new SystemProperty("java.library.path", NULL, true);
400 _java_home = new SystemProperty("java.home", NULL, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414 PropertyList_add(&_system_properties, _vm_info);
415
416 // Set OS specific system properties values
417 os::init_system_properties_values();
418 }
419
420 // Update/Initialize System properties after JDK version number is known
421 void Arguments::init_version_specific_system_properties() {
422 enum { bufsz = 16 };
423 char buffer[bufsz];
424 const char* spec_vendor = "Oracle Corporation";
425 uint32_t spec_version = JDK_Version::current().major_version();
426
427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
428
429 PropertyList_add(&_system_properties,
430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.version", buffer, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
435 }
436
437 /*
438 * -XX argument processing:
439 *
440 * -XX arguments are defined in several places, such as:
441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
442 * -XX arguments are parsed in parse_argument().
443 * -XX argument bounds checking is done in check_vm_args_consistency().
444 *
445 * Over time -XX arguments may change. There are mechanisms to handle common cases:
446 *
447 * ALIASED: An option that is simply another name for another option. This is often
448 * part of the process of deprecating a flag, but not all aliases need
449 * to be deprecated.
450 *
451 * Create an alias for an option by adding the old and new option names to the
452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
453 *
454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
455 * support may be removed in the future. Both regular and aliased options may be
456 * deprecated.
457 *
458 * Add a deprecation warning for an option (or alias) by adding an entry in the
459 * "special_jvm_flags" table and setting the "deprecated_in" field.
460 * Often an option "deprecated" in one major release will
461 * be made "obsolete" in the next. In this case the entry should also have its
462 * "obsolete_in" field set.
463 *
464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
465 * on the command line. A warning is printed to let the user know that option might not
466 * be accepted in the future.
467 *
468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
469 * table and setting the "obsolete_in" field.
470 *
471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
472 * to the current JDK version. The system will flatly refuse to admit the existence of
473 * the flag. This allows a flag to die automatically over JDK releases.
474 *
475 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
477 * - Newly obsolete or expired deprecated options should have their global variable
478 * definitions removed (from globals.hpp, etc) and related implementations removed.
479 *
480 * Recommended approach for removing options:
481 *
482 * To remove options commonly used by customers (e.g. product -XX options), use
483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
484 *
485 * To remove internal options (e.g. diagnostic, experimental, develop options), use
486 * a 2-step model adding major release numbers to the obsolete and expire columns.
487 *
488 * To change the name of an option, use the alias table as well as a 2-step
489 * model adding major release numbers to the deprecate and expire columns.
490 * Think twice about aliasing commonly used customer options.
491 *
492 * There are times when it is appropriate to leave a future release number as undefined.
493 *
494 * Tests: Aliases should be tested in VMAliasOptions.java.
495 * Deprecated options should be tested in VMDeprecatedOptions.java.
496 */
497
498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
501 // the command-line as usual, but will issue a warning.
502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
503 // the command-line, while issuing a warning and ignoring the flag value.
504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
505 // existence of the flag.
506 //
507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
508 // This table ensures that the handling of options will update automatically when the JDK
509 // version is incremented, but the source code needs to be cleanup up manually:
510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
511 // variable should be removed, as well as users of the variable.
512 // - As "deprecated" options age into "obsolete" options, move the entry into the
513 // "Obsolete Flags" section of the table.
514 // - All expired options should be removed from the table.
515 static SpecialFlag const special_jvm_flags[] = {
516 // -------------- Deprecated Flags --------------
517 // --- Non-alias flags - sorted by obsolete_in then expired_in:
518 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
523 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
526 { "PrintVMQWaitTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
527 { "UseNewFieldLayout", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
528
529 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
530 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
533
534 // -------------- Obsolete Flags - sorted by expired_in --------------
535 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
536 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
537 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
538 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
539 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
540 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
541 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
542 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
543 { "GCTaskTimeStampEntries", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
544 { "G1RSetScanBlockSize", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
545 { "UseParallelOldGC", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
546 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
547 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
548
549 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
550 // These entries will generate build errors. Their purpose is to test the macros.
551 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
552 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
553 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
554 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
555 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
556 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
557 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
558 #endif
559
560 { NULL, JDK_Version(0), JDK_Version(0) }
561 };
562
563 // Flags that are aliases for other flags.
564 typedef struct {
565 const char* alias_name;
566 const char* real_name;
567 } AliasedFlag;
568
569 static AliasedFlag const aliased_jvm_flags[] = {
570 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
571 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
572 { NULL, NULL}
573 };
574
575 // NOTE: A compatibility request will be necessary for each alias to be removed.
576 static AliasedLoggingFlag const aliased_logging_flags[] = {
577 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
578 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
579 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
580 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
581 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
582 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
583 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
584 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
585 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
586 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
587 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
588 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
589 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
590 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
591 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
592 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
593 };
594
595 #ifndef PRODUCT
596 // These options are removed in jdk9. Remove this code for jdk10.
597 static AliasedFlag const removed_develop_logging_flags[] = {
598 { "TraceClassInitialization", "-Xlog:class+init" },
599 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
600 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
601 { "TraceItables", "-Xlog:itables=debug" },
602 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
603 { "TraceSafepoint", "-Xlog:safepoint=debug" },
604 { "TraceStartupTime", "-Xlog:startuptime" },
605 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
606 { "PrintVtables", "-Xlog:vtables=debug" },
607 { "VerboseVerification", "-Xlog:verification" },
608 { NULL, NULL }
609 };
610 #endif //PRODUCT
611
612 // Return true if "v" is less than "other", where "other" may be "undefined".
613 static bool version_less_than(JDK_Version v, JDK_Version other) {
614 assert(!v.is_undefined(), "must be defined");
615 if (!other.is_undefined() && v.compare(other) >= 0) {
616 return false;
617 } else {
618 return true;
619 }
620 }
621
622 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
623 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
624 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
625 flag = special_jvm_flags[i];
626 return true;
627 }
628 }
629 return false;
630 }
631
632 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
633 assert(version != NULL, "Must provide a version buffer");
634 SpecialFlag flag;
635 if (lookup_special_flag(flag_name, flag)) {
636 if (!flag.obsolete_in.is_undefined()) {
637 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
638 *version = flag.obsolete_in;
639 // This flag may have been marked for obsoletion in this version, but we may not
640 // have actually removed it yet. Rather than ignoring it as soon as we reach
641 // this version we allow some time for the removal to happen. So if the flag
642 // still actually exists we process it as normal, but issue an adjusted warning.
643 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
644 if (real_flag != NULL) {
645 char version_str[256];
646 version->to_string(version_str, sizeof(version_str));
647 warning("Temporarily processing option %s; support is scheduled for removal in %s",
648 flag_name, version_str);
649 return false;
650 }
651 return true;
652 }
653 }
654 }
655 return false;
656 }
657
658 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
659 assert(version != NULL, "Must provide a version buffer");
660 SpecialFlag flag;
661 if (lookup_special_flag(flag_name, flag)) {
662 if (!flag.deprecated_in.is_undefined()) {
663 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
664 version_less_than(JDK_Version::current(), flag.expired_in)) {
665 *version = flag.deprecated_in;
666 return 1;
667 } else {
668 return -1;
669 }
670 }
671 }
672 return 0;
673 }
674
675 #ifndef PRODUCT
676 const char* Arguments::removed_develop_logging_flag_name(const char* name){
677 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
678 const AliasedFlag& flag = removed_develop_logging_flags[i];
679 if (strcmp(flag.alias_name, name) == 0) {
680 return flag.real_name;
681 }
682 }
683 return NULL;
684 }
685 #endif // PRODUCT
686
687 const char* Arguments::real_flag_name(const char *flag_name) {
688 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
689 const AliasedFlag& flag_status = aliased_jvm_flags[i];
690 if (strcmp(flag_status.alias_name, flag_name) == 0) {
691 return flag_status.real_name;
692 }
693 }
694 return flag_name;
695 }
696
697 #ifdef ASSERT
698 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
699 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
700 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
701 return true;
702 }
703 }
704 return false;
705 }
706
707 // Verifies the correctness of the entries in the special_jvm_flags table.
708 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
709 // version being earlier than the deprecation version, then a warning is issued
710 // and verification fails - by returning false. If it is detected that the table
711 // is out of date, with respect to the current version, then ideally a warning is
712 // issued but verification does not fail. This allows the VM to operate when the
713 // version is first updated, without needing to update all the impacted flags at
714 // the same time. In practice we can't issue the warning immediately when the version
715 // is updated as it occurs for every test and some tests are not prepared to handle
716 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
717 // if the check_globals flag is true, and in addition allow a grace period and only
718 // check for stale flags when we hit build 20 (which is far enough into the 6 month
719 // release cycle that all flag updates should have been processed, whilst still
720 // leaving time to make the change before RDP2).
721 // We use a gtest to call this, passing true, so that we can detect stale flags before
722 // the end of the release cycle.
723
724 static const int SPECIAL_FLAG_VALIDATION_BUILD = 20;
725
726 bool Arguments::verify_special_jvm_flags(bool check_globals) {
727 bool success = true;
728 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
729 const SpecialFlag& flag = special_jvm_flags[i];
730 if (lookup_special_flag(flag.name, i)) {
731 warning("Duplicate special flag declaration \"%s\"", flag.name);
732 success = false;
733 }
734 if (flag.deprecated_in.is_undefined() &&
735 flag.obsolete_in.is_undefined()) {
736 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
737 success = false;
738 }
739
740 if (!flag.deprecated_in.is_undefined()) {
741 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
742 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
743 success = false;
744 }
745
746 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
747 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
748 success = false;
749 }
750 }
751
752 if (!flag.obsolete_in.is_undefined()) {
753 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
754 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
755 success = false;
756 }
757
758 // if flag has become obsolete it should not have a "globals" flag defined anymore.
759 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
760 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
761 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
762 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
763 success = false;
764 }
765 }
766
767 } else if (!flag.expired_in.is_undefined()) {
768 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
769 success = false;
770 }
771
772 if (!flag.expired_in.is_undefined()) {
773 // if flag has become expired it should not have a "globals" flag defined anymore.
774 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
775 !version_less_than(JDK_Version::current(), flag.expired_in)) {
776 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
777 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
778 success = false;
779 }
780 }
781 }
782 }
783 return success;
784 }
785 #endif
786
787 // Parses a size specification string.
788 bool Arguments::atojulong(const char *s, julong* result) {
789 julong n = 0;
790
791 // First char must be a digit. Don't allow negative numbers or leading spaces.
792 if (!isdigit(*s)) {
793 return false;
794 }
795
796 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
797 char* remainder;
798 errno = 0;
799 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
800 if (errno != 0) {
801 return false;
802 }
803
804 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
805 if (remainder == s || strlen(remainder) > 1) {
806 return false;
807 }
808
809 switch (*remainder) {
810 case 'T': case 't':
811 *result = n * G * K;
812 // Check for overflow.
813 if (*result/((julong)G * K) != n) return false;
814 return true;
815 case 'G': case 'g':
816 *result = n * G;
817 if (*result/G != n) return false;
818 return true;
819 case 'M': case 'm':
820 *result = n * M;
821 if (*result/M != n) return false;
822 return true;
823 case 'K': case 'k':
824 *result = n * K;
825 if (*result/K != n) return false;
826 return true;
827 case '\0':
828 *result = n;
829 return true;
830 default:
831 return false;
832 }
833 }
834
835 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
836 if (size < min_size) return arg_too_small;
837 if (size > max_size) return arg_too_big;
838 return arg_in_range;
839 }
840
841 // Describe an argument out of range error
842 void Arguments::describe_range_error(ArgsRange errcode) {
843 switch(errcode) {
844 case arg_too_big:
845 jio_fprintf(defaultStream::error_stream(),
846 "The specified size exceeds the maximum "
847 "representable size.\n");
848 break;
849 case arg_too_small:
850 case arg_unreadable:
851 case arg_in_range:
852 // do nothing for now
853 break;
854 default:
855 ShouldNotReachHere();
856 }
857 }
858
859 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
860 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
861 return true;
862 } else {
863 return false;
864 }
865 }
866
867 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
868 char* end;
869 errno = 0;
870 double v = strtod(value, &end);
871 if ((errno != 0) || (*end != 0)) {
872 return false;
873 }
874
875 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
876 return true;
877 }
878 return false;
879 }
880
881 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
882 julong v;
883 int int_v;
884 intx intx_v;
885 bool is_neg = false;
886
887 if (flag == NULL) {
888 return false;
889 }
890
891 // Check the sign first since atojulong() parses only unsigned values.
892 if (*value == '-') {
893 if (!flag->is_intx() && !flag->is_int()) {
894 return false;
895 }
896 value++;
897 is_neg = true;
898 }
899 if (!Arguments::atojulong(value, &v)) {
900 return false;
901 }
902 if (flag->is_int()) {
903 int_v = (int) v;
904 if (is_neg) {
905 int_v = -int_v;
906 }
907 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
908 } else if (flag->is_uint()) {
909 uint uint_v = (uint) v;
910 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
911 } else if (flag->is_intx()) {
912 intx_v = (intx) v;
913 if (is_neg) {
914 intx_v = -intx_v;
915 }
916 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
917 } else if (flag->is_uintx()) {
918 uintx uintx_v = (uintx) v;
919 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
920 } else if (flag->is_uint64_t()) {
921 uint64_t uint64_t_v = (uint64_t) v;
922 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
923 } else if (flag->is_size_t()) {
924 size_t size_t_v = (size_t) v;
925 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
926 } else if (flag->is_double()) {
927 double double_v = (double) v;
928 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
929 } else {
930 return false;
931 }
932 }
933
934 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
935 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
936 // Contract: JVMFlag always returns a pointer that needs freeing.
937 FREE_C_HEAP_ARRAY(char, value);
938 return true;
939 }
940
941 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
942 const char* old_value = "";
943 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
944 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
945 size_t new_len = strlen(new_value);
946 const char* value;
947 char* free_this_too = NULL;
948 if (old_len == 0) {
949 value = new_value;
950 } else if (new_len == 0) {
951 value = old_value;
952 } else {
953 size_t length = old_len + 1 + new_len + 1;
954 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
955 // each new setting adds another LINE to the switch:
956 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
957 value = buf;
958 free_this_too = buf;
959 }
960 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
961 // JVMFlag always returns a pointer that needs freeing.
962 FREE_C_HEAP_ARRAY(char, value);
963 // JVMFlag made its own copy, so I must delete my own temp. buffer.
964 FREE_C_HEAP_ARRAY(char, free_this_too);
965 return true;
966 }
967
968 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
969 const char* real_name = real_flag_name(arg);
970 JDK_Version since = JDK_Version();
971 switch (is_deprecated_flag(arg, &since)) {
972 case -1: {
973 // Obsolete or expired, so don't process normally,
974 // but allow for an obsolete flag we're still
975 // temporarily allowing.
976 if (!is_obsolete_flag(arg, &since)) {
977 return real_name;
978 }
979 // Note if we're not considered obsolete then we can't be expired either
980 // as obsoletion must come first.
981 return NULL;
982 }
983 case 0:
984 return real_name;
985 case 1: {
986 if (warn) {
987 char version[256];
988 since.to_string(version, sizeof(version));
989 if (real_name != arg) {
990 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
991 arg, version, real_name);
992 } else {
993 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
994 arg, version);
995 }
996 }
997 return real_name;
998 }
999 }
1000 ShouldNotReachHere();
1001 return NULL;
1002 }
1003
1004 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1005 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1006 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1007 const int max_tagset_size = 256;
1008 int max_tagset_len = max_tagset_size - 1;
1009 char tagset_buffer[max_tagset_size];
1010 tagset_buffer[0] = '\0';
1011
1012 // Write tag-set for aliased logging option, in string list form
1013 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1014 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1015 if (i > 0) {
1016 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1017 }
1018 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1019 }
1020 if (!alf.exactMatch) {
1021 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1022 }
1023 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1024 (on) ? "+" : "-",
1025 name,
1026 tagset_buffer,
1027 (on) ? LogLevel::name(alf.level) : "off");
1028 }
1029
1030 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1031 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1032 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1033 if (strcmp(alf.alias_name, name) == 0) {
1034 log_deprecated_flag(name, on, alf);
1035 return alf;
1036 }
1037 }
1038 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1039 return a;
1040 }
1041
1042 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1043
1044 // range of acceptable characters spelled out for portability reasons
1045 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1046 #define BUFLEN 255
1047 char name[BUFLEN+1];
1048 char dummy;
1049 const char* real_name;
1050 bool warn_if_deprecated = true;
1051
1052 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1053 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1054 if (alf.alias_name != NULL){
1055 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1056 return true;
1057 }
1058 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1059 if (real_name == NULL) {
1060 return false;
1061 }
1062 JVMFlag* flag = JVMFlag::find_flag(real_name);
1063 return set_bool_flag(flag, false, origin);
1064 }
1065 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1066 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1067 if (alf.alias_name != NULL){
1068 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1069 return true;
1070 }
1071 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1072 if (real_name == NULL) {
1073 return false;
1074 }
1075 JVMFlag* flag = JVMFlag::find_flag(real_name);
1076 return set_bool_flag(flag, true, origin);
1077 }
1078
1079 char punct;
1080 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1081 const char* value = strchr(arg, '=') + 1;
1082
1083 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1084 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1085 if (alf.alias_name != NULL) {
1086 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1087 return true;
1088 }
1089 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1090 if (real_name == NULL) {
1091 return false;
1092 }
1093 JVMFlag* flag = JVMFlag::find_flag(real_name);
1094 if (flag != NULL && flag->is_ccstr()) {
1095 if (flag->ccstr_accumulates()) {
1096 return append_to_string_flag(flag, value, origin);
1097 } else {
1098 if (value[0] == '\0') {
1099 value = NULL;
1100 }
1101 return set_string_flag(flag, value, origin);
1102 }
1103 } else {
1104 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1105 }
1106 }
1107
1108 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1109 const char* value = strchr(arg, '=') + 1;
1110 // -XX:Foo:=xxx will reset the string flag to the given value.
1111 if (value[0] == '\0') {
1112 value = NULL;
1113 }
1114 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1115 if (real_name == NULL) {
1116 return false;
1117 }
1118 JVMFlag* flag = JVMFlag::find_flag(real_name);
1119 return set_string_flag(flag, value, origin);
1120 }
1121
1122 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1123 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1124 #define NUMBER_RANGE "[0123456789eE+-]"
1125 char value[BUFLEN + 1];
1126 char value2[BUFLEN + 1];
1127 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1128 // Looks like a floating-point number -- try again with more lenient format string
1129 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1130 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1131 if (real_name == NULL) {
1132 return false;
1133 }
1134 JVMFlag* flag = JVMFlag::find_flag(real_name);
1135 return set_fp_numeric_flag(flag, value, origin);
1136 }
1137 }
1138
1139 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1140 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1141 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1142 if (real_name == NULL) {
1143 return false;
1144 }
1145 JVMFlag* flag = JVMFlag::find_flag(real_name);
1146 return set_numeric_flag(flag, value, origin);
1147 }
1148
1149 return false;
1150 }
1151
1152 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1153 assert(bldarray != NULL, "illegal argument");
1154
1155 if (arg == NULL) {
1156 return;
1157 }
1158
1159 int new_count = *count + 1;
1160
1161 // expand the array and add arg to the last element
1162 if (*bldarray == NULL) {
1163 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1164 } else {
1165 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1166 }
1167 (*bldarray)[*count] = os::strdup_check_oom(arg);
1168 *count = new_count;
1169 }
1170
1171 void Arguments::build_jvm_args(const char* arg) {
1172 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1173 }
1174
1175 void Arguments::build_jvm_flags(const char* arg) {
1176 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1177 }
1178
1179 // utility function to return a string that concatenates all
1180 // strings in a given char** array
1181 const char* Arguments::build_resource_string(char** args, int count) {
1182 if (args == NULL || count == 0) {
1183 return NULL;
1184 }
1185 size_t length = 0;
1186 for (int i = 0; i < count; i++) {
1187 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1188 }
1189 char* s = NEW_RESOURCE_ARRAY(char, length);
1190 char* dst = s;
1191 for (int j = 0; j < count; j++) {
1192 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1193 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1194 dst += offset;
1195 length -= offset;
1196 }
1197 return (const char*) s;
1198 }
1199
1200 void Arguments::print_on(outputStream* st) {
1201 st->print_cr("VM Arguments:");
1202 if (num_jvm_flags() > 0) {
1203 st->print("jvm_flags: "); print_jvm_flags_on(st);
1204 st->cr();
1205 }
1206 if (num_jvm_args() > 0) {
1207 st->print("jvm_args: "); print_jvm_args_on(st);
1208 st->cr();
1209 }
1210 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1211 if (_java_class_path != NULL) {
1212 char* path = _java_class_path->value();
1213 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1214 }
1215 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1216 }
1217
1218 void Arguments::print_summary_on(outputStream* st) {
1219 // Print the command line. Environment variables that are helpful for
1220 // reproducing the problem are written later in the hs_err file.
1221 // flags are from setting file
1222 if (num_jvm_flags() > 0) {
1223 st->print_raw("Settings File: ");
1224 print_jvm_flags_on(st);
1225 st->cr();
1226 }
1227 // args are the command line and environment variable arguments.
1228 st->print_raw("Command Line: ");
1229 if (num_jvm_args() > 0) {
1230 print_jvm_args_on(st);
1231 }
1232 // this is the classfile and any arguments to the java program
1233 if (java_command() != NULL) {
1234 st->print("%s", java_command());
1235 }
1236 st->cr();
1237 }
1238
1239 void Arguments::print_jvm_flags_on(outputStream* st) {
1240 if (_num_jvm_flags > 0) {
1241 for (int i=0; i < _num_jvm_flags; i++) {
1242 st->print("%s ", _jvm_flags_array[i]);
1243 }
1244 }
1245 }
1246
1247 void Arguments::print_jvm_args_on(outputStream* st) {
1248 if (_num_jvm_args > 0) {
1249 for (int i=0; i < _num_jvm_args; i++) {
1250 st->print("%s ", _jvm_args_array[i]);
1251 }
1252 }
1253 }
1254
1255 bool Arguments::process_argument(const char* arg,
1256 jboolean ignore_unrecognized,
1257 JVMFlag::Flags origin) {
1258 JDK_Version since = JDK_Version();
1259
1260 if (parse_argument(arg, origin)) {
1261 return true;
1262 }
1263
1264 // Determine if the flag has '+', '-', or '=' characters.
1265 bool has_plus_minus = (*arg == '+' || *arg == '-');
1266 const char* const argname = has_plus_minus ? arg + 1 : arg;
1267
1268 size_t arg_len;
1269 const char* equal_sign = strchr(argname, '=');
1270 if (equal_sign == NULL) {
1271 arg_len = strlen(argname);
1272 } else {
1273 arg_len = equal_sign - argname;
1274 }
1275
1276 // Only make the obsolete check for valid arguments.
1277 if (arg_len <= BUFLEN) {
1278 // Construct a string which consists only of the argument name without '+', '-', or '='.
1279 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1280 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1281 if (is_obsolete_flag(stripped_argname, &since)) {
1282 char version[256];
1283 since.to_string(version, sizeof(version));
1284 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1285 return true;
1286 }
1287 #ifndef PRODUCT
1288 else {
1289 const char* replacement;
1290 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1291 log_warning(arguments)("%s has been removed. Please use %s instead.",
1292 stripped_argname,
1293 replacement);
1294 return false;
1295 }
1296 }
1297 #endif //PRODUCT
1298 }
1299
1300 // For locked flags, report a custom error message if available.
1301 // Otherwise, report the standard unrecognized VM option.
1302 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1303 if (found_flag != NULL) {
1304 char locked_message_buf[BUFLEN];
1305 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1306 if (strlen(locked_message_buf) == 0) {
1307 if (found_flag->is_bool() && !has_plus_minus) {
1308 jio_fprintf(defaultStream::error_stream(),
1309 "Missing +/- setting for VM option '%s'\n", argname);
1310 } else if (!found_flag->is_bool() && has_plus_minus) {
1311 jio_fprintf(defaultStream::error_stream(),
1312 "Unexpected +/- setting in VM option '%s'\n", argname);
1313 } else {
1314 jio_fprintf(defaultStream::error_stream(),
1315 "Improperly specified VM option '%s'\n", argname);
1316 }
1317 } else {
1318 #ifdef PRODUCT
1319 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1320 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1321 if (ignore_unrecognized && mismatched) {
1322 return true;
1323 }
1324 #endif
1325 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1326 }
1327 } else {
1328 if (ignore_unrecognized) {
1329 return true;
1330 }
1331 jio_fprintf(defaultStream::error_stream(),
1332 "Unrecognized VM option '%s'\n", argname);
1333 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1334 if (fuzzy_matched != NULL) {
1335 jio_fprintf(defaultStream::error_stream(),
1336 "Did you mean '%s%s%s'? ",
1337 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1338 fuzzy_matched->_name,
1339 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1340 }
1341 }
1342
1343 // allow for commandline "commenting out" options like -XX:#+Verbose
1344 return arg[0] == '#';
1345 }
1346
1347 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1348 FILE* stream = fopen(file_name, "rb");
1349 if (stream == NULL) {
1350 if (should_exist) {
1351 jio_fprintf(defaultStream::error_stream(),
1352 "Could not open settings file %s\n", file_name);
1353 return false;
1354 } else {
1355 return true;
1356 }
1357 }
1358
1359 char token[1024];
1360 int pos = 0;
1361
1362 bool in_white_space = true;
1363 bool in_comment = false;
1364 bool in_quote = false;
1365 char quote_c = 0;
1366 bool result = true;
1367
1368 int c = getc(stream);
1369 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1370 if (in_white_space) {
1371 if (in_comment) {
1372 if (c == '\n') in_comment = false;
1373 } else {
1374 if (c == '#') in_comment = true;
1375 else if (!isspace(c)) {
1376 in_white_space = false;
1377 token[pos++] = c;
1378 }
1379 }
1380 } else {
1381 if (c == '\n' || (!in_quote && isspace(c))) {
1382 // token ends at newline, or at unquoted whitespace
1383 // this allows a way to include spaces in string-valued options
1384 token[pos] = '\0';
1385 logOption(token);
1386 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1387 build_jvm_flags(token);
1388 pos = 0;
1389 in_white_space = true;
1390 in_quote = false;
1391 } else if (!in_quote && (c == '\'' || c == '"')) {
1392 in_quote = true;
1393 quote_c = c;
1394 } else if (in_quote && (c == quote_c)) {
1395 in_quote = false;
1396 } else {
1397 token[pos++] = c;
1398 }
1399 }
1400 c = getc(stream);
1401 }
1402 if (pos > 0) {
1403 token[pos] = '\0';
1404 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1405 build_jvm_flags(token);
1406 }
1407 fclose(stream);
1408 return result;
1409 }
1410
1411 //=============================================================================================================
1412 // Parsing of properties (-D)
1413
1414 const char* Arguments::get_property(const char* key) {
1415 return PropertyList_get_value(system_properties(), key);
1416 }
1417
1418 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1419 const char* eq = strchr(prop, '=');
1420 const char* key;
1421 const char* value = "";
1422
1423 if (eq == NULL) {
1424 // property doesn't have a value, thus use passed string
1425 key = prop;
1426 } else {
1427 // property have a value, thus extract it and save to the
1428 // allocated string
1429 size_t key_len = eq - prop;
1430 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1431
1432 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1433 key = tmp_key;
1434
1435 value = &prop[key_len + 1];
1436 }
1437
1438 if (strcmp(key, "java.compiler") == 0) {
1439 process_java_compiler_argument(value);
1440 // Record value in Arguments, but let it get passed to Java.
1441 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1442 // sun.java.launcher.is_altjvm property is
1443 // private and is processed in process_sun_java_launcher_properties();
1444 // the sun.java.launcher property is passed on to the java application
1445 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1446 // append is true, writable is true, internal is false
1447 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1448 WriteableProperty, ExternalProperty);
1449 } else {
1450 if (strcmp(key, "sun.java.command") == 0) {
1451 char *old_java_command = _java_command;
1452 _java_command = os::strdup_check_oom(value, mtArguments);
1453 if (old_java_command != NULL) {
1454 os::free(old_java_command);
1455 }
1456 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1457 // If this property is set on the command line then its value will be
1458 // displayed in VM error logs as the URL at which to submit such logs.
1459 // Normally the URL displayed in error logs is different from the value
1460 // of this system property, so a different property should have been
1461 // used here, but we leave this as-is in case someone depends upon it.
1462 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1463 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1464 // its value without going through the property list or making a Java call.
1465 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1466 if (old_java_vendor_url_bug != NULL) {
1467 os::free((void *)old_java_vendor_url_bug);
1468 }
1469 }
1470
1471 // Create new property and add at the end of the list
1472 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1473 }
1474
1475 if (key != prop) {
1476 // SystemProperty copy passed value, thus free previously allocated
1477 // memory
1478 FreeHeap((void *)key);
1479 }
1480
1481 return true;
1482 }
1483
1484 #if INCLUDE_CDS
1485 const char* unsupported_properties[] = { "jdk.module.limitmods",
1486 "jdk.module.upgrade.path",
1487 "jdk.module.patch.0" };
1488 const char* unsupported_options[] = { "--limit-modules",
1489 "--upgrade-module-path",
1490 "--patch-module"
1491 };
1492 void Arguments::check_unsupported_dumping_properties() {
1493 assert(is_dumping_archive(),
1494 "this function is only used with CDS dump time");
1495 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1496 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1497 SystemProperty* sp = system_properties();
1498 while (sp != NULL) {
1499 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1500 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1501 vm_exit_during_initialization(
1502 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1503 }
1504 }
1505 sp = sp->next();
1506 }
1507
1508 // Check for an exploded module build in use with -Xshare:dump.
1509 if (!has_jimage()) {
1510 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1511 }
1512 }
1513
1514 bool Arguments::check_unsupported_cds_runtime_properties() {
1515 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1516 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1517 if (ArchiveClassesAtExit != NULL) {
1518 // dynamic dumping, just return false for now.
1519 // check_unsupported_dumping_properties() will be called later to check the same set of
1520 // properties, and will exit the VM with the correct error message if the unsupported properties
1521 // are used.
1522 return false;
1523 }
1524 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1525 if (get_property(unsupported_properties[i]) != NULL) {
1526 if (RequireSharedSpaces) {
1527 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1528 }
1529 return true;
1530 }
1531 }
1532 return false;
1533 }
1534 #endif
1535
1536 //===========================================================================================================
1537 // Setting int/mixed/comp mode flags
1538
1539 void Arguments::set_mode_flags(Mode mode) {
1540 // Set up default values for all flags.
1541 // If you add a flag to any of the branches below,
1542 // add a default value for it here.
1543 set_java_compiler(false);
1544 _mode = mode;
1545
1546 // Ensure Agent_OnLoad has the correct initial values.
1547 // This may not be the final mode; mode may change later in onload phase.
1548 PropertyList_unique_add(&_system_properties, "java.vm.info",
1549 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1550
1551 UseInterpreter = true;
1552 UseCompiler = true;
1553 UseLoopCounter = true;
1554
1555 // Default values may be platform/compiler dependent -
1556 // use the saved values
1557 ClipInlining = Arguments::_ClipInlining;
1558 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1559 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1560 BackgroundCompilation = Arguments::_BackgroundCompilation;
1561 if (TieredCompilation) {
1562 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1563 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1564 }
1565 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1566 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1567 }
1568 }
1569
1570 // Change from defaults based on mode
1571 switch (mode) {
1572 default:
1573 ShouldNotReachHere();
1574 break;
1575 case _int:
1576 UseCompiler = false;
1577 UseLoopCounter = false;
1578 AlwaysCompileLoopMethods = false;
1579 UseOnStackReplacement = false;
1580 break;
1581 case _mixed:
1582 // same as default
1583 break;
1584 case _comp:
1585 UseInterpreter = false;
1586 BackgroundCompilation = false;
1587 ClipInlining = false;
1588 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1589 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1590 // compile a level 4 (C2) and then continue executing it.
1591 if (TieredCompilation) {
1592 Tier3InvokeNotifyFreqLog = 0;
1593 Tier4InvocationThreshold = 0;
1594 }
1595 break;
1596 }
1597 }
1598
1599 // Conflict: required to use shared spaces (-Xshare:on), but
1600 // incompatible command line options were chosen.
1601 static void no_shared_spaces(const char* message) {
1602 if (RequireSharedSpaces) {
1603 jio_fprintf(defaultStream::error_stream(),
1604 "Class data sharing is inconsistent with other specified options.\n");
1605 vm_exit_during_initialization("Unable to use shared archive", message);
1606 } else {
1607 log_info(cds)("Unable to use shared archive: %s", message);
1608 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1609 }
1610 }
1611
1612 void set_object_alignment() {
1613 // Object alignment.
1614 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1615 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1616 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1617 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1618 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1619 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1620
1621 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1622 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1623
1624 // Oop encoding heap max
1625 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1626
1627 if (SurvivorAlignmentInBytes == 0) {
1628 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1629 }
1630 }
1631
1632 size_t Arguments::max_heap_for_compressed_oops() {
1633 // Avoid sign flip.
1634 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1635 // We need to fit both the NULL page and the heap into the memory budget, while
1636 // keeping alignment constraints of the heap. To guarantee the latter, as the
1637 // NULL page is located before the heap, we pad the NULL page to the conservative
1638 // maximum alignment that the GC may ever impose upon the heap.
1639 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1640 _conservative_max_heap_alignment);
1641
1642 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1643 NOT_LP64(ShouldNotReachHere(); return 0);
1644 }
1645
1646 void Arguments::set_use_compressed_oops() {
1647 #ifndef ZERO
1648 #ifdef _LP64
1649 // MaxHeapSize is not set up properly at this point, but
1650 // the only value that can override MaxHeapSize if we are
1651 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1652 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1653
1654 if (max_heap_size <= max_heap_for_compressed_oops()) {
1655 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1656 FLAG_SET_ERGO(UseCompressedOops, true);
1657 }
1658 } else {
1659 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1660 warning("Max heap size too large for Compressed Oops");
1661 FLAG_SET_DEFAULT(UseCompressedOops, false);
1662 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1663 }
1664 }
1665 #endif // _LP64
1666 #endif // ZERO
1667 }
1668
1669
1670 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1671 // set_use_compressed_oops().
1672 void Arguments::set_use_compressed_klass_ptrs() {
1673 #ifndef ZERO
1674 #ifdef _LP64
1675 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1676 if (!UseCompressedOops) {
1677 if (UseCompressedClassPointers) {
1678 warning("UseCompressedClassPointers requires UseCompressedOops");
1679 }
1680 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1681 } else {
1682 // Turn on UseCompressedClassPointers too
1683 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1684 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1685 }
1686 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1687 if (UseCompressedClassPointers) {
1688 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1689 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1690 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1691 }
1692 }
1693 }
1694 #endif // _LP64
1695 #endif // !ZERO
1696 }
1697
1698 void Arguments::set_conservative_max_heap_alignment() {
1699 // The conservative maximum required alignment for the heap is the maximum of
1700 // the alignments imposed by several sources: any requirements from the heap
1701 // itself and the maximum page size we may run the VM with.
1702 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1703 _conservative_max_heap_alignment = MAX4(heap_alignment,
1704 (size_t)os::vm_allocation_granularity(),
1705 os::max_page_size(),
1706 GCArguments::compute_heap_alignment());
1707 }
1708
1709 jint Arguments::set_ergonomics_flags() {
1710 GCConfig::initialize();
1711
1712 set_conservative_max_heap_alignment();
1713
1714 #ifndef ZERO
1715 #ifdef _LP64
1716 set_use_compressed_oops();
1717
1718 // set_use_compressed_klass_ptrs() must be called after calling
1719 // set_use_compressed_oops().
1720 set_use_compressed_klass_ptrs();
1721
1722 // Also checks that certain machines are slower with compressed oops
1723 // in vm_version initialization code.
1724 #endif // _LP64
1725 #endif // !ZERO
1726
1727 return JNI_OK;
1728 }
1729
1730 julong Arguments::limit_by_allocatable_memory(julong limit) {
1731 julong max_allocatable;
1732 julong result = limit;
1733 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1734 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1735 }
1736 return result;
1737 }
1738
1739 // Use static initialization to get the default before parsing
1740 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1741
1742 void Arguments::set_heap_size() {
1743 julong phys_mem;
1744
1745 // If the user specified one of these options, they
1746 // want specific memory sizing so do not limit memory
1747 // based on compressed oops addressability.
1748 // Also, memory limits will be calculated based on
1749 // available os physical memory, not our MaxRAM limit,
1750 // unless MaxRAM is also specified.
1751 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1752 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1753 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1754 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1755 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1756 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1757 !FLAG_IS_DEFAULT(MaxRAM));
1758 if (override_coop_limit) {
1759 if (FLAG_IS_DEFAULT(MaxRAM)) {
1760 phys_mem = os::physical_memory();
1761 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1762 } else {
1763 phys_mem = (julong)MaxRAM;
1764 }
1765 } else {
1766 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1767 : (julong)MaxRAM;
1768 }
1769
1770
1771 // Convert deprecated flags
1772 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1773 !FLAG_IS_DEFAULT(MaxRAMFraction))
1774 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1775
1776 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1777 !FLAG_IS_DEFAULT(MinRAMFraction))
1778 MinRAMPercentage = 100.0 / MinRAMFraction;
1779
1780 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1781 !FLAG_IS_DEFAULT(InitialRAMFraction))
1782 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1783
1784 // If the maximum heap size has not been set with -Xmx,
1785 // then set it as fraction of the size of physical memory,
1786 // respecting the maximum and minimum sizes of the heap.
1787 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1788 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1789 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1790 if (reasonable_min < MaxHeapSize) {
1791 // Small physical memory, so use a minimum fraction of it for the heap
1792 reasonable_max = reasonable_min;
1793 } else {
1794 // Not-small physical memory, so require a heap at least
1795 // as large as MaxHeapSize
1796 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1797 }
1798
1799 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1800 // Limit the heap size to ErgoHeapSizeLimit
1801 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1802 }
1803
1804 #ifdef _LP64
1805 if (UseCompressedOops) {
1806 // Limit the heap size to the maximum possible when using compressed oops
1807 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1808
1809 // HeapBaseMinAddress can be greater than default but not less than.
1810 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1811 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1812 // matches compressed oops printing flags
1813 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1814 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1815 DefaultHeapBaseMinAddress,
1816 DefaultHeapBaseMinAddress/G,
1817 HeapBaseMinAddress);
1818 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1819 }
1820 }
1821
1822 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1823 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1824 // but it should be not less than default MaxHeapSize.
1825 max_coop_heap -= HeapBaseMinAddress;
1826 }
1827
1828 // If user specified flags prioritizing os physical
1829 // memory limits, then disable compressed oops if
1830 // limits exceed max_coop_heap and UseCompressedOops
1831 // was not specified.
1832 if (reasonable_max > max_coop_heap) {
1833 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1834 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1835 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1836 "Please check the setting of MaxRAMPercentage %5.2f."
1837 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1838 FLAG_SET_ERGO(UseCompressedOops, false);
1839 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1840 } else {
1841 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1842 }
1843 }
1844 }
1845 #endif // _LP64
1846
1847 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1848
1849 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1850 // An initial heap size was specified on the command line,
1851 // so be sure that the maximum size is consistent. Done
1852 // after call to limit_by_allocatable_memory because that
1853 // method might reduce the allocation size.
1854 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1855 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1856 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1857 }
1858
1859 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1860 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1861 }
1862
1863 // If the minimum or initial heap_size have not been set or requested to be set
1864 // ergonomically, set them accordingly.
1865 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1866 julong reasonable_minimum = (julong)(OldSize + NewSize);
1867
1868 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1869
1870 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1871
1872 if (InitialHeapSize == 0) {
1873 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1874
1875 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1876 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1877
1878 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1879
1880 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1881 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1882 }
1883 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1884 // synchronize with InitialHeapSize to avoid errors with the default value.
1885 if (MinHeapSize == 0) {
1886 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1887 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1888 }
1889 }
1890 }
1891
1892 // This option inspects the machine and attempts to set various
1893 // parameters to be optimal for long-running, memory allocation
1894 // intensive jobs. It is intended for machines with large
1895 // amounts of cpu and memory.
1896 jint Arguments::set_aggressive_heap_flags() {
1897 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1898 // VM, but we may not be able to represent the total physical memory
1899 // available (like having 8gb of memory on a box but using a 32bit VM).
1900 // Thus, we need to make sure we're using a julong for intermediate
1901 // calculations.
1902 julong initHeapSize;
1903 julong total_memory = os::physical_memory();
1904
1905 if (total_memory < (julong) 256 * M) {
1906 jio_fprintf(defaultStream::error_stream(),
1907 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1908 vm_exit(1);
1909 }
1910
1911 // The heap size is half of available memory, or (at most)
1912 // all of possible memory less 160mb (leaving room for the OS
1913 // when using ISM). This is the maximum; because adaptive sizing
1914 // is turned on below, the actual space used may be smaller.
1915
1916 initHeapSize = MIN2(total_memory / (julong) 2,
1917 total_memory - (julong) 160 * M);
1918
1919 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1920
1921 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1922 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1923 return JNI_EINVAL;
1924 }
1925 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1926 return JNI_EINVAL;
1927 }
1928 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1929 return JNI_EINVAL;
1930 }
1931 }
1932 if (FLAG_IS_DEFAULT(NewSize)) {
1933 // Make the young generation 3/8ths of the total heap.
1934 if (FLAG_SET_CMDLINE(NewSize,
1935 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1936 return JNI_EINVAL;
1937 }
1938 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1939 return JNI_EINVAL;
1940 }
1941 }
1942
1943 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1944 FLAG_SET_DEFAULT(UseLargePages, true);
1945 #endif
1946
1947 // Increase some data structure sizes for efficiency
1948 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1949 return JNI_EINVAL;
1950 }
1951 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1952 return JNI_EINVAL;
1953 }
1954 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1955 return JNI_EINVAL;
1956 }
1957
1958 // See the OldPLABSize comment below, but replace 'after promotion'
1959 // with 'after copying'. YoungPLABSize is the size of the survivor
1960 // space per-gc-thread buffers. The default is 4kw.
1961 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1962 return JNI_EINVAL;
1963 }
1964
1965 // OldPLABSize is the size of the buffers in the old gen that
1966 // UseParallelGC uses to promote live data that doesn't fit in the
1967 // survivor spaces. At any given time, there's one for each gc thread.
1968 // The default size is 1kw. These buffers are rarely used, since the
1969 // survivor spaces are usually big enough. For specjbb, however, there
1970 // are occasions when there's lots of live data in the young gen
1971 // and we end up promoting some of it. We don't have a definite
1972 // explanation for why bumping OldPLABSize helps, but the theory
1973 // is that a bigger PLAB results in retaining something like the
1974 // original allocation order after promotion, which improves mutator
1975 // locality. A minor effect may be that larger PLABs reduce the
1976 // number of PLAB allocation events during gc. The value of 8kw
1977 // was arrived at by experimenting with specjbb.
1978 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1979 return JNI_EINVAL;
1980 }
1981
1982 // Enable parallel GC and adaptive generation sizing
1983 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1984 return JNI_EINVAL;
1985 }
1986
1987 // Encourage steady state memory management
1988 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1989 return JNI_EINVAL;
1990 }
1991
1992 // This appears to improve mutator locality
1993 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1994 return JNI_EINVAL;
1995 }
1996
1997 return JNI_OK;
1998 }
1999
2000 // This must be called after ergonomics.
2001 void Arguments::set_bytecode_flags() {
2002 if (!RewriteBytecodes) {
2003 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2004 }
2005 }
2006
2007 // Aggressive optimization flags
2008 jint Arguments::set_aggressive_opts_flags() {
2009 #ifdef COMPILER2
2010 if (AggressiveUnboxing) {
2011 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2012 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2013 } else if (!EliminateAutoBox) {
2014 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2015 AggressiveUnboxing = false;
2016 }
2017 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2018 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2019 } else if (!DoEscapeAnalysis) {
2020 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2021 AggressiveUnboxing = false;
2022 }
2023 }
2024 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2025 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2026 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2027 }
2028 // Feed the cache size setting into the JDK
2029 char buffer[1024];
2030 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2031 if (!add_property(buffer)) {
2032 return JNI_ENOMEM;
2033 }
2034 }
2035 #endif
2036
2037 return JNI_OK;
2038 }
2039
2040 //===========================================================================================================
2041 // Parsing of java.compiler property
2042
2043 void Arguments::process_java_compiler_argument(const char* arg) {
2044 // For backwards compatibility, Djava.compiler=NONE or ""
2045 // causes us to switch to -Xint mode UNLESS -Xdebug
2046 // is also specified.
2047 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2048 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2049 }
2050 }
2051
2052 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2053 _sun_java_launcher = os::strdup_check_oom(launcher);
2054 }
2055
2056 bool Arguments::created_by_java_launcher() {
2057 assert(_sun_java_launcher != NULL, "property must have value");
2058 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2059 }
2060
2061 bool Arguments::sun_java_launcher_is_altjvm() {
2062 return _sun_java_launcher_is_altjvm;
2063 }
2064
2065 //===========================================================================================================
2066 // Parsing of main arguments
2067
2068 unsigned int addreads_count = 0;
2069 unsigned int addexports_count = 0;
2070 unsigned int addopens_count = 0;
2071 unsigned int addmods_count = 0;
2072 unsigned int patch_mod_count = 0;
2073
2074 // Check the consistency of vm_init_args
2075 bool Arguments::check_vm_args_consistency() {
2076 // Method for adding checks for flag consistency.
2077 // The intent is to warn the user of all possible conflicts,
2078 // before returning an error.
2079 // Note: Needs platform-dependent factoring.
2080 bool status = true;
2081
2082 if (TLABRefillWasteFraction == 0) {
2083 jio_fprintf(defaultStream::error_stream(),
2084 "TLABRefillWasteFraction should be a denominator, "
2085 "not " SIZE_FORMAT "\n",
2086 TLABRefillWasteFraction);
2087 status = false;
2088 }
2089
2090 if (PrintNMTStatistics) {
2091 #if INCLUDE_NMT
2092 if (MemTracker::tracking_level() == NMT_off) {
2093 #endif // INCLUDE_NMT
2094 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2095 PrintNMTStatistics = false;
2096 #if INCLUDE_NMT
2097 }
2098 #endif
2099 }
2100
2101 status = CompilerConfig::check_args_consistency(status);
2102 #if INCLUDE_JVMCI
2103 if (status && EnableJVMCI) {
2104 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2105 AddProperty, UnwriteableProperty, InternalProperty);
2106 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2107 return false;
2108 }
2109 }
2110 #endif
2111
2112 #ifndef SUPPORT_RESERVED_STACK_AREA
2113 if (StackReservedPages != 0) {
2114 FLAG_SET_CMDLINE(StackReservedPages, 0);
2115 warning("Reserved Stack Area not supported on this platform");
2116 }
2117 #endif
2118
2119 status = status && GCArguments::check_args_consistency();
2120
2121 return status;
2122 }
2123
2124 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2125 const char* option_type) {
2126 if (ignore) return false;
2127
2128 const char* spacer = " ";
2129 if (option_type == NULL) {
2130 option_type = ++spacer; // Set both to the empty string.
2131 }
2132
2133 jio_fprintf(defaultStream::error_stream(),
2134 "Unrecognized %s%soption: %s\n", option_type, spacer,
2135 option->optionString);
2136 return true;
2137 }
2138
2139 static const char* user_assertion_options[] = {
2140 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2141 };
2142
2143 static const char* system_assertion_options[] = {
2144 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2145 };
2146
2147 bool Arguments::parse_uintx(const char* value,
2148 uintx* uintx_arg,
2149 uintx min_size) {
2150
2151 // Check the sign first since atojulong() parses only unsigned values.
2152 bool value_is_positive = !(*value == '-');
2153
2154 if (value_is_positive) {
2155 julong n;
2156 bool good_return = atojulong(value, &n);
2157 if (good_return) {
2158 bool above_minimum = n >= min_size;
2159 bool value_is_too_large = n > max_uintx;
2160
2161 if (above_minimum && !value_is_too_large) {
2162 *uintx_arg = n;
2163 return true;
2164 }
2165 }
2166 }
2167 return false;
2168 }
2169
2170 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2171 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2172 char* property = AllocateHeap(prop_len, mtArguments);
2173 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2174 if (ret < 0 || ret >= (int)prop_len) {
2175 FreeHeap(property);
2176 return false;
2177 }
2178 bool added = add_property(property, UnwriteableProperty, internal);
2179 FreeHeap(property);
2180 return added;
2181 }
2182
2183 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2184 const unsigned int props_count_limit = 1000;
2185 const int max_digits = 3;
2186 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2187
2188 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2189 if (count < props_count_limit) {
2190 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2191 char* property = AllocateHeap(prop_len, mtArguments);
2192 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2193 if (ret < 0 || ret >= (int)prop_len) {
2194 FreeHeap(property);
2195 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2196 return false;
2197 }
2198 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2199 FreeHeap(property);
2200 return added;
2201 }
2202
2203 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2204 return false;
2205 }
2206
2207 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2208 julong* long_arg,
2209 julong min_size,
2210 julong max_size) {
2211 if (!atojulong(s, long_arg)) return arg_unreadable;
2212 return check_memory_size(*long_arg, min_size, max_size);
2213 }
2214
2215 // Parse JavaVMInitArgs structure
2216
2217 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2218 const JavaVMInitArgs *java_tool_options_args,
2219 const JavaVMInitArgs *java_options_args,
2220 const JavaVMInitArgs *cmd_line_args) {
2221 bool patch_mod_javabase = false;
2222
2223 // Save default settings for some mode flags
2224 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2225 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2226 Arguments::_ClipInlining = ClipInlining;
2227 Arguments::_BackgroundCompilation = BackgroundCompilation;
2228 if (TieredCompilation) {
2229 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2230 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2231 }
2232
2233 // CDS dumping always write the archive to the default value of SharedBaseAddress.
2234 Arguments::_SharedBaseAddress = SharedBaseAddress;
2235
2236 // Setup flags for mixed which is the default
2237 set_mode_flags(_mixed);
2238
2239 // Parse args structure generated from java.base vm options resource
2240 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2241 if (result != JNI_OK) {
2242 return result;
2243 }
2244
2245 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2246 // variable (if present).
2247 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2248 if (result != JNI_OK) {
2249 return result;
2250 }
2251
2252 // Parse args structure generated from the command line flags.
2253 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2254 if (result != JNI_OK) {
2255 return result;
2256 }
2257
2258 // Parse args structure generated from the _JAVA_OPTIONS environment
2259 // variable (if present) (mimics classic VM)
2260 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2261 if (result != JNI_OK) {
2262 return result;
2263 }
2264
2265 // We need to ensure processor and memory resources have been properly
2266 // configured - which may rely on arguments we just processed - before
2267 // doing the final argument processing. Any argument processing that
2268 // needs to know about processor and memory resources must occur after
2269 // this point.
2270
2271 os::init_container_support();
2272
2273 // Do final processing now that all arguments have been parsed
2274 result = finalize_vm_init_args(patch_mod_javabase);
2275 if (result != JNI_OK) {
2276 return result;
2277 }
2278
2279 return JNI_OK;
2280 }
2281
2282 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2283 // represents a valid JDWP agent. is_path==true denotes that we
2284 // are dealing with -agentpath (case where name is a path), otherwise with
2285 // -agentlib
2286 bool valid_jdwp_agent(char *name, bool is_path) {
2287 char *_name;
2288 const char *_jdwp = "jdwp";
2289 size_t _len_jdwp, _len_prefix;
2290
2291 if (is_path) {
2292 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2293 return false;
2294 }
2295
2296 _name++; // skip past last path separator
2297 _len_prefix = strlen(JNI_LIB_PREFIX);
2298
2299 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2300 return false;
2301 }
2302
2303 _name += _len_prefix;
2304 _len_jdwp = strlen(_jdwp);
2305
2306 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2307 _name += _len_jdwp;
2308 }
2309 else {
2310 return false;
2311 }
2312
2313 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2314 return false;
2315 }
2316
2317 return true;
2318 }
2319
2320 if (strcmp(name, _jdwp) == 0) {
2321 return true;
2322 }
2323
2324 return false;
2325 }
2326
2327 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2328 // --patch-module=<module>=<file>(<pathsep><file>)*
2329 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2330 // Find the equal sign between the module name and the path specification
2331 const char* module_equal = strchr(patch_mod_tail, '=');
2332 if (module_equal == NULL) {
2333 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2334 return JNI_ERR;
2335 } else {
2336 // Pick out the module name
2337 size_t module_len = module_equal - patch_mod_tail;
2338 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2339 if (module_name != NULL) {
2340 memcpy(module_name, patch_mod_tail, module_len);
2341 *(module_name + module_len) = '\0';
2342 // The path piece begins one past the module_equal sign
2343 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2344 FREE_C_HEAP_ARRAY(char, module_name);
2345 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2346 return JNI_ENOMEM;
2347 }
2348 } else {
2349 return JNI_ENOMEM;
2350 }
2351 }
2352 return JNI_OK;
2353 }
2354
2355 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2356 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2357 // The min and max sizes match the values in globals.hpp, but scaled
2358 // with K. The values have been chosen so that alignment with page
2359 // size doesn't change the max value, which makes the conversions
2360 // back and forth between Xss value and ThreadStackSize value easier.
2361 // The values have also been chosen to fit inside a 32-bit signed type.
2362 const julong min_ThreadStackSize = 0;
2363 const julong max_ThreadStackSize = 1 * M;
2364
2365 const julong min_size = min_ThreadStackSize * K;
2366 const julong max_size = max_ThreadStackSize * K;
2367
2368 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2369
2370 julong size = 0;
2371 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2372 if (errcode != arg_in_range) {
2373 bool silent = (option == NULL); // Allow testing to silence error messages
2374 if (!silent) {
2375 jio_fprintf(defaultStream::error_stream(),
2376 "Invalid thread stack size: %s\n", option->optionString);
2377 describe_range_error(errcode);
2378 }
2379 return JNI_EINVAL;
2380 }
2381
2382 // Internally track ThreadStackSize in units of 1024 bytes.
2383 const julong size_aligned = align_up(size, K);
2384 assert(size <= size_aligned,
2385 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2386 size, size_aligned);
2387
2388 const julong size_in_K = size_aligned / K;
2389 assert(size_in_K < (julong)max_intx,
2390 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2391 size_in_K);
2392
2393 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2394 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2395 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2396 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2397 max_expanded, size_in_K);
2398
2399 *out_ThreadStackSize = (intx)size_in_K;
2400
2401 return JNI_OK;
2402 }
2403
2404 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2405 // For match_option to return remaining or value part of option string
2406 const char* tail;
2407
2408 // iterate over arguments
2409 for (int index = 0; index < args->nOptions; index++) {
2410 bool is_absolute_path = false; // for -agentpath vs -agentlib
2411
2412 const JavaVMOption* option = args->options + index;
2413
2414 if (!match_option(option, "-Djava.class.path", &tail) &&
2415 !match_option(option, "-Dsun.java.command", &tail) &&
2416 !match_option(option, "-Dsun.java.launcher", &tail)) {
2417
2418 // add all jvm options to the jvm_args string. This string
2419 // is used later to set the java.vm.args PerfData string constant.
2420 // the -Djava.class.path and the -Dsun.java.command options are
2421 // omitted from jvm_args string as each have their own PerfData
2422 // string constant object.
2423 build_jvm_args(option->optionString);
2424 }
2425
2426 // -verbose:[class/module/gc/jni]
2427 if (match_option(option, "-verbose", &tail)) {
2428 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2429 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2430 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2431 } else if (!strcmp(tail, ":module")) {
2432 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2433 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2434 } else if (!strcmp(tail, ":gc")) {
2435 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2436 } else if (!strcmp(tail, ":jni")) {
2437 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2438 }
2439 // -da / -ea / -disableassertions / -enableassertions
2440 // These accept an optional class/package name separated by a colon, e.g.,
2441 // -da:java.lang.Thread.
2442 } else if (match_option(option, user_assertion_options, &tail, true)) {
2443 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2444 if (*tail == '\0') {
2445 JavaAssertions::setUserClassDefault(enable);
2446 } else {
2447 assert(*tail == ':', "bogus match by match_option()");
2448 JavaAssertions::addOption(tail + 1, enable);
2449 }
2450 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2451 } else if (match_option(option, system_assertion_options, &tail, false)) {
2452 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2453 JavaAssertions::setSystemClassDefault(enable);
2454 // -bootclasspath:
2455 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2456 jio_fprintf(defaultStream::output_stream(),
2457 "-Xbootclasspath is no longer a supported option.\n");
2458 return JNI_EINVAL;
2459 // -bootclasspath/a:
2460 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2461 Arguments::append_sysclasspath(tail);
2462 // -bootclasspath/p:
2463 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2464 jio_fprintf(defaultStream::output_stream(),
2465 "-Xbootclasspath/p is no longer a supported option.\n");
2466 return JNI_EINVAL;
2467 // -Xrun
2468 } else if (match_option(option, "-Xrun", &tail)) {
2469 if (tail != NULL) {
2470 const char* pos = strchr(tail, ':');
2471 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2472 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2473 jio_snprintf(name, len + 1, "%s", tail);
2474
2475 char *options = NULL;
2476 if(pos != NULL) {
2477 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2478 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2479 }
2480 #if !INCLUDE_JVMTI
2481 if (strcmp(name, "jdwp") == 0) {
2482 jio_fprintf(defaultStream::error_stream(),
2483 "Debugging agents are not supported in this VM\n");
2484 return JNI_ERR;
2485 }
2486 #endif // !INCLUDE_JVMTI
2487 add_init_library(name, options);
2488 }
2489 } else if (match_option(option, "--add-reads=", &tail)) {
2490 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2491 return JNI_ENOMEM;
2492 }
2493 } else if (match_option(option, "--add-exports=", &tail)) {
2494 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2495 return JNI_ENOMEM;
2496 }
2497 } else if (match_option(option, "--add-opens=", &tail)) {
2498 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2499 return JNI_ENOMEM;
2500 }
2501 } else if (match_option(option, "--add-modules=", &tail)) {
2502 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2503 return JNI_ENOMEM;
2504 }
2505 } else if (match_option(option, "--limit-modules=", &tail)) {
2506 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2507 return JNI_ENOMEM;
2508 }
2509 } else if (match_option(option, "--module-path=", &tail)) {
2510 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2511 return JNI_ENOMEM;
2512 }
2513 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2514 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2515 return JNI_ENOMEM;
2516 }
2517 } else if (match_option(option, "--patch-module=", &tail)) {
2518 // --patch-module=<module>=<file>(<pathsep><file>)*
2519 int res = process_patch_mod_option(tail, patch_mod_javabase);
2520 if (res != JNI_OK) {
2521 return res;
2522 }
2523 } else if (match_option(option, "--illegal-access=", &tail)) {
2524 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2525 return JNI_ENOMEM;
2526 }
2527 // -agentlib and -agentpath
2528 } else if (match_option(option, "-agentlib:", &tail) ||
2529 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2530 if(tail != NULL) {
2531 const char* pos = strchr(tail, '=');
2532 char* name;
2533 if (pos == NULL) {
2534 name = os::strdup_check_oom(tail, mtArguments);
2535 } else {
2536 size_t len = pos - tail;
2537 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2538 memcpy(name, tail, len);
2539 name[len] = '\0';
2540 }
2541
2542 char *options = NULL;
2543 if(pos != NULL) {
2544 options = os::strdup_check_oom(pos + 1, mtArguments);
2545 }
2546 #if !INCLUDE_JVMTI
2547 if (valid_jdwp_agent(name, is_absolute_path)) {
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Debugging agents are not supported in this VM\n");
2550 return JNI_ERR;
2551 }
2552 #endif // !INCLUDE_JVMTI
2553 add_init_agent(name, options, is_absolute_path);
2554 }
2555 // -javaagent
2556 } else if (match_option(option, "-javaagent:", &tail)) {
2557 #if !INCLUDE_JVMTI
2558 jio_fprintf(defaultStream::error_stream(),
2559 "Instrumentation agents are not supported in this VM\n");
2560 return JNI_ERR;
2561 #else
2562 if (tail != NULL) {
2563 size_t length = strlen(tail) + 1;
2564 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2565 jio_snprintf(options, length, "%s", tail);
2566 add_instrument_agent("instrument", options, false);
2567 // java agents need module java.instrument
2568 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2569 return JNI_ENOMEM;
2570 }
2571 }
2572 #endif // !INCLUDE_JVMTI
2573 // --enable_preview
2574 } else if (match_option(option, "--enable-preview")) {
2575 set_enable_preview();
2576 // -Xnoclassgc
2577 } else if (match_option(option, "-Xnoclassgc")) {
2578 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2579 return JNI_EINVAL;
2580 }
2581 // -Xbatch
2582 } else if (match_option(option, "-Xbatch")) {
2583 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2584 return JNI_EINVAL;
2585 }
2586 // -Xmn for compatibility with other JVM vendors
2587 } else if (match_option(option, "-Xmn", &tail)) {
2588 julong long_initial_young_size = 0;
2589 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2590 if (errcode != arg_in_range) {
2591 jio_fprintf(defaultStream::error_stream(),
2592 "Invalid initial young generation size: %s\n", option->optionString);
2593 describe_range_error(errcode);
2594 return JNI_EINVAL;
2595 }
2596 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2597 return JNI_EINVAL;
2598 }
2599 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2600 return JNI_EINVAL;
2601 }
2602 // -Xms
2603 } else if (match_option(option, "-Xms", &tail)) {
2604 julong size = 0;
2605 // an initial heap size of 0 means automatically determine
2606 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2607 if (errcode != arg_in_range) {
2608 jio_fprintf(defaultStream::error_stream(),
2609 "Invalid initial heap size: %s\n", option->optionString);
2610 describe_range_error(errcode);
2611 return JNI_EINVAL;
2612 }
2613 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2614 return JNI_EINVAL;
2615 }
2616 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2617 return JNI_EINVAL;
2618 }
2619 // -Xmx
2620 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2621 julong long_max_heap_size = 0;
2622 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2623 if (errcode != arg_in_range) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Invalid maximum heap size: %s\n", option->optionString);
2626 describe_range_error(errcode);
2627 return JNI_EINVAL;
2628 }
2629 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2630 return JNI_EINVAL;
2631 }
2632 // Xmaxf
2633 } else if (match_option(option, "-Xmaxf", &tail)) {
2634 char* err;
2635 int maxf = (int)(strtod(tail, &err) * 100);
2636 if (*err != '\0' || *tail == '\0') {
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Bad max heap free percentage size: %s\n",
2639 option->optionString);
2640 return JNI_EINVAL;
2641 } else {
2642 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 }
2646 // Xminf
2647 } else if (match_option(option, "-Xminf", &tail)) {
2648 char* err;
2649 int minf = (int)(strtod(tail, &err) * 100);
2650 if (*err != '\0' || *tail == '\0') {
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Bad min heap free percentage size: %s\n",
2653 option->optionString);
2654 return JNI_EINVAL;
2655 } else {
2656 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2657 return JNI_EINVAL;
2658 }
2659 }
2660 // -Xss
2661 } else if (match_option(option, "-Xss", &tail)) {
2662 intx value = 0;
2663 jint err = parse_xss(option, tail, &value);
2664 if (err != JNI_OK) {
2665 return err;
2666 }
2667 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2668 return JNI_EINVAL;
2669 }
2670 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2671 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2672 julong long_ReservedCodeCacheSize = 0;
2673
2674 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2675 if (errcode != arg_in_range) {
2676 jio_fprintf(defaultStream::error_stream(),
2677 "Invalid maximum code cache size: %s.\n", option->optionString);
2678 return JNI_EINVAL;
2679 }
2680 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2681 return JNI_EINVAL;
2682 }
2683 // -green
2684 } else if (match_option(option, "-green")) {
2685 jio_fprintf(defaultStream::error_stream(),
2686 "Green threads support not available\n");
2687 return JNI_EINVAL;
2688 // -native
2689 } else if (match_option(option, "-native")) {
2690 // HotSpot always uses native threads, ignore silently for compatibility
2691 // -Xrs
2692 } else if (match_option(option, "-Xrs")) {
2693 // Classic/EVM option, new functionality
2694 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 // -Xprof
2698 } else if (match_option(option, "-Xprof")) {
2699 char version[256];
2700 // Obsolete in JDK 10
2701 JDK_Version::jdk(10).to_string(version, sizeof(version));
2702 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2703 // -Xinternalversion
2704 } else if (match_option(option, "-Xinternalversion")) {
2705 jio_fprintf(defaultStream::output_stream(), "%s\n",
2706 VM_Version::internal_vm_info_string());
2707 vm_exit(0);
2708 #ifndef PRODUCT
2709 // -Xprintflags
2710 } else if (match_option(option, "-Xprintflags")) {
2711 JVMFlag::printFlags(tty, false);
2712 vm_exit(0);
2713 #endif
2714 // -D
2715 } else if (match_option(option, "-D", &tail)) {
2716 const char* value;
2717 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2718 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2719 // abort if -Djava.endorsed.dirs is set
2720 jio_fprintf(defaultStream::output_stream(),
2721 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2722 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2723 return JNI_EINVAL;
2724 }
2725 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2726 *value != '\0' && strcmp(value, "\"\"") != 0) {
2727 // abort if -Djava.ext.dirs is set
2728 jio_fprintf(defaultStream::output_stream(),
2729 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2730 return JNI_EINVAL;
2731 }
2732 // Check for module related properties. They must be set using the modules
2733 // options. For example: use "--add-modules=java.sql", not
2734 // "-Djdk.module.addmods=java.sql"
2735 if (is_internal_module_property(option->optionString + 2)) {
2736 needs_module_property_warning = true;
2737 continue;
2738 }
2739 if (!add_property(tail)) {
2740 return JNI_ENOMEM;
2741 }
2742 // Out of the box management support
2743 if (match_option(option, "-Dcom.sun.management", &tail)) {
2744 #if INCLUDE_MANAGEMENT
2745 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 // management agent in module jdk.management.agent
2749 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2750 return JNI_ENOMEM;
2751 }
2752 #else
2753 jio_fprintf(defaultStream::output_stream(),
2754 "-Dcom.sun.management is not supported in this VM.\n");
2755 return JNI_ERR;
2756 #endif
2757 }
2758 // -Xint
2759 } else if (match_option(option, "-Xint")) {
2760 set_mode_flags(_int);
2761 // -Xmixed
2762 } else if (match_option(option, "-Xmixed")) {
2763 set_mode_flags(_mixed);
2764 // -Xcomp
2765 } else if (match_option(option, "-Xcomp")) {
2766 // for testing the compiler; turn off all flags that inhibit compilation
2767 set_mode_flags(_comp);
2768 // -Xshare:dump
2769 } else if (match_option(option, "-Xshare:dump")) {
2770 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 // -Xshare:on
2774 } else if (match_option(option, "-Xshare:on")) {
2775 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2782 } else if (match_option(option, "-Xshare:auto")) {
2783 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2787 return JNI_EINVAL;
2788 }
2789 // -Xshare:off
2790 } else if (match_option(option, "-Xshare:off")) {
2791 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2792 return JNI_EINVAL;
2793 }
2794 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2795 return JNI_EINVAL;
2796 }
2797 // -Xverify
2798 } else if (match_option(option, "-Xverify", &tail)) {
2799 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2800 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2804 return JNI_EINVAL;
2805 }
2806 } else if (strcmp(tail, ":remote") == 0) {
2807 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2808 return JNI_EINVAL;
2809 }
2810 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2811 return JNI_EINVAL;
2812 }
2813 } else if (strcmp(tail, ":none") == 0) {
2814 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2818 return JNI_EINVAL;
2819 }
2820 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2821 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2822 return JNI_EINVAL;
2823 }
2824 // -Xdebug
2825 } else if (match_option(option, "-Xdebug")) {
2826 // note this flag has been used, then ignore
2827 set_xdebug_mode(true);
2828 // -Xnoagent
2829 } else if (match_option(option, "-Xnoagent")) {
2830 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2831 } else if (match_option(option, "-Xloggc:", &tail)) {
2832 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2833 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2834 _gc_log_filename = os::strdup_check_oom(tail);
2835 } else if (match_option(option, "-Xlog", &tail)) {
2836 bool ret = false;
2837 if (strcmp(tail, ":help") == 0) {
2838 fileStream stream(defaultStream::output_stream());
2839 LogConfiguration::print_command_line_help(&stream);
2840 vm_exit(0);
2841 } else if (strcmp(tail, ":disable") == 0) {
2842 LogConfiguration::disable_logging();
2843 ret = true;
2844 } else if (*tail == '\0') {
2845 ret = LogConfiguration::parse_command_line_arguments();
2846 assert(ret, "-Xlog without arguments should never fail to parse");
2847 } else if (*tail == ':') {
2848 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2849 }
2850 if (ret == false) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2853 tail);
2854 return JNI_EINVAL;
2855 }
2856 // JNI hooks
2857 } else if (match_option(option, "-Xcheck", &tail)) {
2858 if (!strcmp(tail, ":jni")) {
2859 #if !INCLUDE_JNI_CHECK
2860 warning("JNI CHECKING is not supported in this VM");
2861 #else
2862 CheckJNICalls = true;
2863 #endif // INCLUDE_JNI_CHECK
2864 } else if (is_bad_option(option, args->ignoreUnrecognized,
2865 "check")) {
2866 return JNI_EINVAL;
2867 }
2868 } else if (match_option(option, "vfprintf")) {
2869 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2870 } else if (match_option(option, "exit")) {
2871 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2872 } else if (match_option(option, "abort")) {
2873 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2874 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2875 // and the last option wins.
2876 } else if (match_option(option, "-XX:+NeverTenure")) {
2877 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2884 return JNI_EINVAL;
2885 }
2886 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2887 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2897 uintx max_tenuring_thresh = 0;
2898 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2899 jio_fprintf(defaultStream::error_stream(),
2900 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2901 return JNI_EINVAL;
2902 }
2903
2904 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907
2908 if (MaxTenuringThreshold == 0) {
2909 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2910 return JNI_EINVAL;
2911 }
2912 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2913 return JNI_EINVAL;
2914 }
2915 } else {
2916 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 }
2923 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2924 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2928 return JNI_EINVAL;
2929 }
2930 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2931 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2938 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2939 return JNI_EINVAL;
2940 }
2941 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2942 return JNI_EINVAL;
2943 }
2944 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2945 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2952 #if defined(DTRACE_ENABLED)
2953 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 #else // defined(DTRACE_ENABLED)
2966 jio_fprintf(defaultStream::error_stream(),
2967 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2968 return JNI_EINVAL;
2969 #endif // defined(DTRACE_ENABLED)
2970 #ifdef ASSERT
2971 } else if (match_option(option, "-XX:+FullGCALot")) {
2972 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2973 return JNI_EINVAL;
2974 }
2975 // disable scavenge before parallel mark-compact
2976 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2977 return JNI_EINVAL;
2978 }
2979 #endif
2980 #if !INCLUDE_MANAGEMENT
2981 } else if (match_option(option, "-XX:+ManagementServer")) {
2982 jio_fprintf(defaultStream::error_stream(),
2983 "ManagementServer is not supported in this VM.\n");
2984 return JNI_ERR;
2985 #endif // INCLUDE_MANAGEMENT
2986 #if INCLUDE_JVMCI
2987 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2988 if (EnableJVMCIProduct) {
2989 jio_fprintf(defaultStream::error_stream(),
2990 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2991 return JNI_EINVAL;
2992 }
2993 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2994 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2995 // Allow this flag if it has been unlocked.
2996 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2997 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2998 jio_fprintf(defaultStream::error_stream(),
2999 "Unable to enable JVMCI in product mode");
3000 return JNI_ERR;
3001 }
3002 }
3003 // The flag was locked so process normally to report that error
3004 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3005 return JNI_EINVAL;
3006 }
3007 #endif // INCLUDE_JVMCI
3008 #if INCLUDE_JFR
3009 } else if (match_jfr_option(&option)) {
3010 return JNI_EINVAL;
3011 #endif
3012 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3013 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3014 // already been handled
3015 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3016 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3017 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3018 return JNI_EINVAL;
3019 }
3020 }
3021 // Unknown option
3022 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3023 return JNI_ERR;
3024 }
3025 }
3026
3027 // PrintSharedArchiveAndExit will turn on
3028 // -Xshare:on
3029 // -Xlog:class+path=info
3030 if (PrintSharedArchiveAndExit) {
3031 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3032 return JNI_EINVAL;
3033 }
3034 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3035 return JNI_EINVAL;
3036 }
3037 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3038 }
3039
3040 fix_appclasspath();
3041
3042 return JNI_OK;
3043 }
3044
3045 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3046 // For java.base check for duplicate --patch-module options being specified on the command line.
3047 // This check is only required for java.base, all other duplicate module specifications
3048 // will be checked during module system initialization. The module system initialization
3049 // will throw an ExceptionInInitializerError if this situation occurs.
3050 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3051 if (*patch_mod_javabase) {
3052 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3053 } else {
3054 *patch_mod_javabase = true;
3055 }
3056 }
3057
3058 // Create GrowableArray lazily, only if --patch-module has been specified
3059 if (_patch_mod_prefix == NULL) {
3060 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3061 }
3062
3063 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3064 }
3065
3066 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3067 //
3068 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3069 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3070 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3071 // path is treated as the current directory.
3072 //
3073 // This causes problems with CDS, which requires that all directories specified in the classpath
3074 // must be empty. In most cases, applications do NOT want to load classes from the current
3075 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3076 // scripts compatible with CDS.
3077 void Arguments::fix_appclasspath() {
3078 if (IgnoreEmptyClassPaths) {
3079 const char separator = *os::path_separator();
3080 const char* src = _java_class_path->value();
3081
3082 // skip over all the leading empty paths
3083 while (*src == separator) {
3084 src ++;
3085 }
3086
3087 char* copy = os::strdup_check_oom(src, mtArguments);
3088
3089 // trim all trailing empty paths
3090 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3091 *tail = '\0';
3092 }
3093
3094 char from[3] = {separator, separator, '\0'};
3095 char to [2] = {separator, '\0'};
3096 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3097 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3098 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3099 }
3100
3101 _java_class_path->set_writeable_value(copy);
3102 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3103 }
3104 }
3105
3106 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3107 // check if the default lib/endorsed directory exists; if so, error
3108 char path[JVM_MAXPATHLEN];
3109 const char* fileSep = os::file_separator();
3110 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3111
3112 DIR* dir = os::opendir(path);
3113 if (dir != NULL) {
3114 jio_fprintf(defaultStream::output_stream(),
3115 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3116 "in modular form will be supported via the concept of upgradeable modules.\n");
3117 os::closedir(dir);
3118 return JNI_ERR;
3119 }
3120
3121 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3122 dir = os::opendir(path);
3123 if (dir != NULL) {
3124 jio_fprintf(defaultStream::output_stream(),
3125 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3126 "Use -classpath instead.\n.");
3127 os::closedir(dir);
3128 return JNI_ERR;
3129 }
3130
3131 // This must be done after all arguments have been processed
3132 // and the container support has been initialized since AggressiveHeap
3133 // relies on the amount of total memory available.
3134 if (AggressiveHeap) {
3135 jint result = set_aggressive_heap_flags();
3136 if (result != JNI_OK) {
3137 return result;
3138 }
3139 }
3140
3141 // This must be done after all arguments have been processed.
3142 // java_compiler() true means set to "NONE" or empty.
3143 if (java_compiler() && !xdebug_mode()) {
3144 // For backwards compatibility, we switch to interpreted mode if
3145 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3146 // not specified.
3147 set_mode_flags(_int);
3148 }
3149
3150 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3151 // but like -Xint, leave compilation thresholds unaffected.
3152 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3153 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3154 set_mode_flags(_int);
3155 }
3156
3157 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3158 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3159 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3160 }
3161
3162 #if !COMPILER2_OR_JVMCI
3163 // Don't degrade server performance for footprint
3164 if (FLAG_IS_DEFAULT(UseLargePages) &&
3165 MaxHeapSize < LargePageHeapSizeThreshold) {
3166 // No need for large granularity pages w/small heaps.
3167 // Note that large pages are enabled/disabled for both the
3168 // Java heap and the code cache.
3169 FLAG_SET_DEFAULT(UseLargePages, false);
3170 }
3171
3172 UNSUPPORTED_OPTION(ProfileInterpreter);
3173 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3174 #endif
3175
3176
3177 #ifdef TIERED
3178 // Parse the CompilationMode flag
3179 if (!CompilationModeFlag::initialize()) {
3180 return JNI_ERR;
3181 }
3182 #else
3183 // Tiered compilation is undefined.
3184 UNSUPPORTED_OPTION(TieredCompilation);
3185 #endif
3186
3187 if (!check_vm_args_consistency()) {
3188 return JNI_ERR;
3189 }
3190
3191 #if INCLUDE_CDS
3192 if (DumpSharedSpaces) {
3193 // Disable biased locking now as it interferes with the clean up of
3194 // the archived Klasses and Java string objects (at dump time only).
3195 UseBiasedLocking = false;
3196
3197 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3198 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3199 // compiler just to be safe.
3200 //
3201 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3202 // instead of modifying them in place. The copy is inaccessible to the compiler.
3203 // TODO: revisit the following for the static archive case.
3204 set_mode_flags(_int);
3205 }
3206 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3207 // Always verify non-system classes during CDS dump
3208 if (!BytecodeVerificationRemote) {
3209 BytecodeVerificationRemote = true;
3210 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3211 }
3212 }
3213 if (ArchiveClassesAtExit == NULL) {
3214 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3215 }
3216 if (UseSharedSpaces && patch_mod_javabase) {
3217 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3218 }
3219 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3220 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3221 }
3222 #endif
3223
3224 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3225 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3226 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3227
3228 return JNI_OK;
3229 }
3230
3231 // Helper class for controlling the lifetime of JavaVMInitArgs
3232 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3233 // deleted on the destruction of the ScopedVMInitArgs object.
3234 class ScopedVMInitArgs : public StackObj {
3235 private:
3236 JavaVMInitArgs _args;
3237 char* _container_name;
3238 bool _is_set;
3239 char* _vm_options_file_arg;
3240
3241 public:
3242 ScopedVMInitArgs(const char *container_name) {
3243 _args.version = JNI_VERSION_1_2;
3244 _args.nOptions = 0;
3245 _args.options = NULL;
3246 _args.ignoreUnrecognized = false;
3247 _container_name = (char *)container_name;
3248 _is_set = false;
3249 _vm_options_file_arg = NULL;
3250 }
3251
3252 // Populates the JavaVMInitArgs object represented by this
3253 // ScopedVMInitArgs object with the arguments in options. The
3254 // allocated memory is deleted by the destructor. If this method
3255 // returns anything other than JNI_OK, then this object is in a
3256 // partially constructed state, and should be abandoned.
3257 jint set_args(GrowableArray<JavaVMOption>* options) {
3258 _is_set = true;
3259 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3260 JavaVMOption, options->length(), mtArguments);
3261 if (options_arr == NULL) {
3262 return JNI_ENOMEM;
3263 }
3264 _args.options = options_arr;
3265
3266 for (int i = 0; i < options->length(); i++) {
3267 options_arr[i] = options->at(i);
3268 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3269 if (options_arr[i].optionString == NULL) {
3270 // Rely on the destructor to do cleanup.
3271 _args.nOptions = i;
3272 return JNI_ENOMEM;
3273 }
3274 }
3275
3276 _args.nOptions = options->length();
3277 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3278 return JNI_OK;
3279 }
3280
3281 JavaVMInitArgs* get() { return &_args; }
3282 char* container_name() { return _container_name; }
3283 bool is_set() { return _is_set; }
3284 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3285 char* vm_options_file_arg() { return _vm_options_file_arg; }
3286
3287 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3288 if (_vm_options_file_arg != NULL) {
3289 os::free(_vm_options_file_arg);
3290 }
3291 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3292 }
3293
3294 ~ScopedVMInitArgs() {
3295 if (_vm_options_file_arg != NULL) {
3296 os::free(_vm_options_file_arg);
3297 }
3298 if (_args.options == NULL) return;
3299 for (int i = 0; i < _args.nOptions; i++) {
3300 os::free(_args.options[i].optionString);
3301 }
3302 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3303 }
3304
3305 // Insert options into this option list, to replace option at
3306 // vm_options_file_pos (-XX:VMOptionsFile)
3307 jint insert(const JavaVMInitArgs* args,
3308 const JavaVMInitArgs* args_to_insert,
3309 const int vm_options_file_pos) {
3310 assert(_args.options == NULL, "shouldn't be set yet");
3311 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3312 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3313
3314 int length = args->nOptions + args_to_insert->nOptions - 1;
3315 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3316 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3317 for (int i = 0; i < args->nOptions; i++) {
3318 if (i == vm_options_file_pos) {
3319 // insert the new options starting at the same place as the
3320 // -XX:VMOptionsFile option
3321 for (int j = 0; j < args_to_insert->nOptions; j++) {
3322 options->push(args_to_insert->options[j]);
3323 }
3324 } else {
3325 options->push(args->options[i]);
3326 }
3327 }
3328 // make into options array
3329 jint result = set_args(options);
3330 delete options;
3331 return result;
3332 }
3333 };
3334
3335 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3336 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3337 }
3338
3339 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3340 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3341 }
3342
3343 jint Arguments::parse_options_environment_variable(const char* name,
3344 ScopedVMInitArgs* vm_args) {
3345 char *buffer = ::getenv(name);
3346
3347 // Don't check this environment variable if user has special privileges
3348 // (e.g. unix su command).
3349 if (buffer == NULL || os::have_special_privileges()) {
3350 return JNI_OK;
3351 }
3352
3353 if ((buffer = os::strdup(buffer)) == NULL) {
3354 return JNI_ENOMEM;
3355 }
3356
3357 jio_fprintf(defaultStream::error_stream(),
3358 "Picked up %s: %s\n", name, buffer);
3359
3360 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3361
3362 os::free(buffer);
3363 return retcode;
3364 }
3365
3366 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3367 // read file into buffer
3368 int fd = ::open(file_name, O_RDONLY);
3369 if (fd < 0) {
3370 jio_fprintf(defaultStream::error_stream(),
3371 "Could not open options file '%s'\n",
3372 file_name);
3373 return JNI_ERR;
3374 }
3375
3376 struct stat stbuf;
3377 int retcode = os::stat(file_name, &stbuf);
3378 if (retcode != 0) {
3379 jio_fprintf(defaultStream::error_stream(),
3380 "Could not stat options file '%s'\n",
3381 file_name);
3382 os::close(fd);
3383 return JNI_ERR;
3384 }
3385
3386 if (stbuf.st_size == 0) {
3387 // tell caller there is no option data and that is ok
3388 os::close(fd);
3389 return JNI_OK;
3390 }
3391
3392 // '+ 1' for NULL termination even with max bytes
3393 size_t bytes_alloc = stbuf.st_size + 1;
3394
3395 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3396 if (NULL == buf) {
3397 jio_fprintf(defaultStream::error_stream(),
3398 "Could not allocate read buffer for options file parse\n");
3399 os::close(fd);
3400 return JNI_ENOMEM;
3401 }
3402
3403 memset(buf, 0, bytes_alloc);
3404
3405 // Fill buffer
3406 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3407 os::close(fd);
3408 if (bytes_read < 0) {
3409 FREE_C_HEAP_ARRAY(char, buf);
3410 jio_fprintf(defaultStream::error_stream(),
3411 "Could not read options file '%s'\n", file_name);
3412 return JNI_ERR;
3413 }
3414
3415 if (bytes_read == 0) {
3416 // tell caller there is no option data and that is ok
3417 FREE_C_HEAP_ARRAY(char, buf);
3418 return JNI_OK;
3419 }
3420
3421 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3422
3423 FREE_C_HEAP_ARRAY(char, buf);
3424 return retcode;
3425 }
3426
3427 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3428 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3429
3430 // some pointers to help with parsing
3431 char *buffer_end = buffer + buf_len;
3432 char *opt_hd = buffer;
3433 char *wrt = buffer;
3434 char *rd = buffer;
3435
3436 // parse all options
3437 while (rd < buffer_end) {
3438 // skip leading white space from the input string
3439 while (rd < buffer_end && isspace(*rd)) {
3440 rd++;
3441 }
3442
3443 if (rd >= buffer_end) {
3444 break;
3445 }
3446
3447 // Remember this is where we found the head of the token.
3448 opt_hd = wrt;
3449
3450 // Tokens are strings of non white space characters separated
3451 // by one or more white spaces.
3452 while (rd < buffer_end && !isspace(*rd)) {
3453 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3454 int quote = *rd; // matching quote to look for
3455 rd++; // don't copy open quote
3456 while (rd < buffer_end && *rd != quote) {
3457 // include everything (even spaces)
3458 // up until the close quote
3459 *wrt++ = *rd++; // copy to option string
3460 }
3461
3462 if (rd < buffer_end) {
3463 rd++; // don't copy close quote
3464 } else {
3465 // did not see closing quote
3466 jio_fprintf(defaultStream::error_stream(),
3467 "Unmatched quote in %s\n", name);
3468 delete options;
3469 return JNI_ERR;
3470 }
3471 } else {
3472 *wrt++ = *rd++; // copy to option string
3473 }
3474 }
3475
3476 // steal a white space character and set it to NULL
3477 *wrt++ = '\0';
3478 // We now have a complete token
3479
3480 JavaVMOption option;
3481 option.optionString = opt_hd;
3482 option.extraInfo = NULL;
3483
3484 options->append(option); // Fill in option
3485
3486 rd++; // Advance to next character
3487 }
3488
3489 // Fill out JavaVMInitArgs structure.
3490 jint status = vm_args->set_args(options);
3491
3492 delete options;
3493 return status;
3494 }
3495
3496 void Arguments::set_shared_spaces_flags() {
3497 if (DumpSharedSpaces) {
3498 if (RequireSharedSpaces) {
3499 warning("Cannot dump shared archive while using shared archive");
3500 }
3501 UseSharedSpaces = false;
3502 }
3503 }
3504
3505 #if INCLUDE_CDS
3506 // Sharing support
3507 // Construct the path to the archive
3508 char* Arguments::get_default_shared_archive_path() {
3509 char *default_archive_path;
3510 char jvm_path[JVM_MAXPATHLEN];
3511 os::jvm_path(jvm_path, sizeof(jvm_path));
3512 char *end = strrchr(jvm_path, *os::file_separator());
3513 if (end != NULL) *end = '\0';
3514 size_t jvm_path_len = strlen(jvm_path);
3515 size_t file_sep_len = strlen(os::file_separator());
3516 const size_t len = jvm_path_len + file_sep_len + 20;
3517 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3518 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3519 jvm_path, os::file_separator());
3520 return default_archive_path;
3521 }
3522
3523 int Arguments::num_archives(const char* archive_path) {
3524 if (archive_path == NULL) {
3525 return 0;
3526 }
3527 int npaths = 1;
3528 char* p = (char*)archive_path;
3529 while (*p != '\0') {
3530 if (*p == os::path_separator()[0]) {
3531 npaths++;
3532 }
3533 p++;
3534 }
3535 return npaths;
3536 }
3537
3538 void Arguments::extract_shared_archive_paths(const char* archive_path,
3539 char** base_archive_path,
3540 char** top_archive_path) {
3541 char* begin_ptr = (char*)archive_path;
3542 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3543 if (end_ptr == NULL || end_ptr == begin_ptr) {
3544 vm_exit_during_initialization("Base archive was not specified", archive_path);
3545 }
3546 size_t len = end_ptr - begin_ptr;
3547 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3548 strncpy(cur_path, begin_ptr, len);
3549 cur_path[len] = '\0';
3550 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3551 *base_archive_path = cur_path;
3552
3553 begin_ptr = ++end_ptr;
3554 if (*begin_ptr == '\0') {
3555 vm_exit_during_initialization("Top archive was not specified", archive_path);
3556 }
3557 end_ptr = strchr(begin_ptr, '\0');
3558 assert(end_ptr != NULL, "sanity");
3559 len = end_ptr - begin_ptr;
3560 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3561 strncpy(cur_path, begin_ptr, len + 1);
3562 //cur_path[len] = '\0';
3563 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3564 *top_archive_path = cur_path;
3565 }
3566
3567 bool Arguments::init_shared_archive_paths() {
3568 if (ArchiveClassesAtExit != NULL) {
3569 if (DumpSharedSpaces) {
3570 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3571 }
3572 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3573 return false;
3574 }
3575 check_unsupported_dumping_properties();
3576 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3577 }
3578 if (SharedArchiveFile == NULL) {
3579 SharedArchivePath = get_default_shared_archive_path();
3580 } else {
3581 int archives = num_archives(SharedArchiveFile);
3582 if (is_dumping_archive()) {
3583 if (archives > 1) {
3584 vm_exit_during_initialization(
3585 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3586 }
3587 if (DynamicDumpSharedSpaces) {
3588 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3589 vm_exit_during_initialization(
3590 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3591 SharedArchiveFile);
3592 }
3593 }
3594 }
3595 if (!is_dumping_archive()){
3596 if (archives > 2) {
3597 vm_exit_during_initialization(
3598 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3599 }
3600 if (archives == 1) {
3601 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3602 int name_size;
3603 bool success =
3604 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3605 if (!success) {
3606 SharedArchivePath = temp_archive_path;
3607 } else {
3608 SharedDynamicArchivePath = temp_archive_path;
3609 }
3610 } else {
3611 extract_shared_archive_paths((const char*)SharedArchiveFile,
3612 &SharedArchivePath, &SharedDynamicArchivePath);
3613 }
3614 } else { // CDS dumping
3615 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3616 }
3617 }
3618 return (SharedArchivePath != NULL);
3619 }
3620 #endif // INCLUDE_CDS
3621
3622 #ifndef PRODUCT
3623 // Determine whether LogVMOutput should be implicitly turned on.
3624 static bool use_vm_log() {
3625 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3626 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3627 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3628 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3629 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3630 return true;
3631 }
3632
3633 #ifdef COMPILER1
3634 if (PrintC1Statistics) {
3635 return true;
3636 }
3637 #endif // COMPILER1
3638
3639 #ifdef COMPILER2
3640 if (PrintOptoAssembly || PrintOptoStatistics) {
3641 return true;
3642 }
3643 #endif // COMPILER2
3644
3645 return false;
3646 }
3647
3648 #endif // PRODUCT
3649
3650 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3651 for (int index = 0; index < args->nOptions; index++) {
3652 const JavaVMOption* option = args->options + index;
3653 const char* tail;
3654 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3655 return true;
3656 }
3657 }
3658 return false;
3659 }
3660
3661 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3662 const char* vm_options_file,
3663 const int vm_options_file_pos,
3664 ScopedVMInitArgs* vm_options_file_args,
3665 ScopedVMInitArgs* args_out) {
3666 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3667 if (code != JNI_OK) {
3668 return code;
3669 }
3670
3671 if (vm_options_file_args->get()->nOptions < 1) {
3672 return JNI_OK;
3673 }
3674
3675 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3676 jio_fprintf(defaultStream::error_stream(),
3677 "A VM options file may not refer to a VM options file. "
3678 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3679 "options file '%s' in options container '%s' is an error.\n",
3680 vm_options_file_args->vm_options_file_arg(),
3681 vm_options_file_args->container_name());
3682 return JNI_EINVAL;
3683 }
3684
3685 return args_out->insert(args, vm_options_file_args->get(),
3686 vm_options_file_pos);
3687 }
3688
3689 // Expand -XX:VMOptionsFile found in args_in as needed.
3690 // mod_args and args_out parameters may return values as needed.
3691 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3692 ScopedVMInitArgs* mod_args,
3693 JavaVMInitArgs** args_out) {
3694 jint code = match_special_option_and_act(args_in, mod_args);
3695 if (code != JNI_OK) {
3696 return code;
3697 }
3698
3699 if (mod_args->is_set()) {
3700 // args_in contains -XX:VMOptionsFile and mod_args contains the
3701 // original options from args_in along with the options expanded
3702 // from the VMOptionsFile. Return a short-hand to the caller.
3703 *args_out = mod_args->get();
3704 } else {
3705 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3706 }
3707 return JNI_OK;
3708 }
3709
3710 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3711 ScopedVMInitArgs* args_out) {
3712 // Remaining part of option string
3713 const char* tail;
3714 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3715
3716 for (int index = 0; index < args->nOptions; index++) {
3717 const JavaVMOption* option = args->options + index;
3718 if (match_option(option, "-XX:Flags=", &tail)) {
3719 Arguments::set_jvm_flags_file(tail);
3720 continue;
3721 }
3722 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3723 if (vm_options_file_args.found_vm_options_file_arg()) {
3724 jio_fprintf(defaultStream::error_stream(),
3725 "The option '%s' is already specified in the options "
3726 "container '%s' so the specification of '%s' in the "
3727 "same options container is an error.\n",
3728 vm_options_file_args.vm_options_file_arg(),
3729 vm_options_file_args.container_name(),
3730 option->optionString);
3731 return JNI_EINVAL;
3732 }
3733 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3734 // If there's a VMOptionsFile, parse that
3735 jint code = insert_vm_options_file(args, tail, index,
3736 &vm_options_file_args, args_out);
3737 if (code != JNI_OK) {
3738 return code;
3739 }
3740 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3741 if (args_out->is_set()) {
3742 // The VMOptions file inserted some options so switch 'args'
3743 // to the new set of options, and continue processing which
3744 // preserves "last option wins" semantics.
3745 args = args_out->get();
3746 // The first option from the VMOptionsFile replaces the
3747 // current option. So we back track to process the
3748 // replacement option.
3749 index--;
3750 }
3751 continue;
3752 }
3753 if (match_option(option, "-XX:+PrintVMOptions")) {
3754 PrintVMOptions = true;
3755 continue;
3756 }
3757 if (match_option(option, "-XX:-PrintVMOptions")) {
3758 PrintVMOptions = false;
3759 continue;
3760 }
3761 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3762 IgnoreUnrecognizedVMOptions = true;
3763 continue;
3764 }
3765 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3766 IgnoreUnrecognizedVMOptions = false;
3767 continue;
3768 }
3769 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3770 JVMFlag::printFlags(tty, false);
3771 vm_exit(0);
3772 }
3773 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3774 #if INCLUDE_NMT
3775 // The launcher did not setup nmt environment variable properly.
3776 if (!MemTracker::check_launcher_nmt_support(tail)) {
3777 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3778 }
3779
3780 // Verify if nmt option is valid.
3781 if (MemTracker::verify_nmt_option()) {
3782 // Late initialization, still in single-threaded mode.
3783 if (MemTracker::tracking_level() >= NMT_summary) {
3784 MemTracker::init();
3785 }
3786 } else {
3787 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3788 }
3789 continue;
3790 #else
3791 jio_fprintf(defaultStream::error_stream(),
3792 "Native Memory Tracking is not supported in this VM\n");
3793 return JNI_ERR;
3794 #endif
3795 }
3796
3797 #ifndef PRODUCT
3798 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3799 JVMFlag::printFlags(tty, true);
3800 vm_exit(0);
3801 }
3802 #endif
3803 }
3804 return JNI_OK;
3805 }
3806
3807 static void print_options(const JavaVMInitArgs *args) {
3808 const char* tail;
3809 for (int index = 0; index < args->nOptions; index++) {
3810 const JavaVMOption *option = args->options + index;
3811 if (match_option(option, "-XX:", &tail)) {
3812 logOption(tail);
3813 }
3814 }
3815 }
3816
3817 bool Arguments::handle_deprecated_print_gc_flags() {
3818 if (PrintGC) {
3819 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3820 }
3821 if (PrintGCDetails) {
3822 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3823 }
3824
3825 if (_gc_log_filename != NULL) {
3826 // -Xloggc was used to specify a filename
3827 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3828
3829 LogTarget(Error, logging) target;
3830 LogStream errstream(target);
3831 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3832 } else if (PrintGC || PrintGCDetails) {
3833 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3834 }
3835 return true;
3836 }
3837
3838 // Parse entry point called from JNI_CreateJavaVM
3839
3840 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3841 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3842
3843 // Initialize ranges and constraints
3844 JVMFlagRangeList::init();
3845 JVMFlagConstraintList::init();
3846
3847 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3848 const char* hotspotrc = ".hotspotrc";
3849 bool settings_file_specified = false;
3850 bool needs_hotspotrc_warning = false;
3851 ScopedVMInitArgs initial_vm_options_args("");
3852 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3853 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3854
3855 // Pointers to current working set of containers
3856 JavaVMInitArgs* cur_cmd_args;
3857 JavaVMInitArgs* cur_vm_options_args;
3858 JavaVMInitArgs* cur_java_options_args;
3859 JavaVMInitArgs* cur_java_tool_options_args;
3860
3861 // Containers for modified/expanded options
3862 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3863 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3864 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3865 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3866
3867
3868 jint code =
3869 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3870 if (code != JNI_OK) {
3871 return code;
3872 }
3873
3874 code = parse_java_options_environment_variable(&initial_java_options_args);
3875 if (code != JNI_OK) {
3876 return code;
3877 }
3878
3879 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3880 char *vmoptions = ClassLoader::lookup_vm_options();
3881 if (vmoptions != NULL) {
3882 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3883 FREE_C_HEAP_ARRAY(char, vmoptions);
3884 if (code != JNI_OK) {
3885 return code;
3886 }
3887 }
3888
3889 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3890 &mod_java_tool_options_args,
3891 &cur_java_tool_options_args);
3892 if (code != JNI_OK) {
3893 return code;
3894 }
3895
3896 code = expand_vm_options_as_needed(initial_cmd_args,
3897 &mod_cmd_args,
3898 &cur_cmd_args);
3899 if (code != JNI_OK) {
3900 return code;
3901 }
3902
3903 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3904 &mod_java_options_args,
3905 &cur_java_options_args);
3906 if (code != JNI_OK) {
3907 return code;
3908 }
3909
3910 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3911 &mod_vm_options_args,
3912 &cur_vm_options_args);
3913 if (code != JNI_OK) {
3914 return code;
3915 }
3916
3917 const char* flags_file = Arguments::get_jvm_flags_file();
3918 settings_file_specified = (flags_file != NULL);
3919
3920 if (IgnoreUnrecognizedVMOptions) {
3921 cur_cmd_args->ignoreUnrecognized = true;
3922 cur_java_tool_options_args->ignoreUnrecognized = true;
3923 cur_java_options_args->ignoreUnrecognized = true;
3924 }
3925
3926 // Parse specified settings file
3927 if (settings_file_specified) {
3928 if (!process_settings_file(flags_file, true,
3929 cur_cmd_args->ignoreUnrecognized)) {
3930 return JNI_EINVAL;
3931 }
3932 } else {
3933 #ifdef ASSERT
3934 // Parse default .hotspotrc settings file
3935 if (!process_settings_file(".hotspotrc", false,
3936 cur_cmd_args->ignoreUnrecognized)) {
3937 return JNI_EINVAL;
3938 }
3939 #else
3940 struct stat buf;
3941 if (os::stat(hotspotrc, &buf) == 0) {
3942 needs_hotspotrc_warning = true;
3943 }
3944 #endif
3945 }
3946
3947 if (PrintVMOptions) {
3948 print_options(cur_java_tool_options_args);
3949 print_options(cur_cmd_args);
3950 print_options(cur_java_options_args);
3951 }
3952
3953 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3954 jint result = parse_vm_init_args(cur_vm_options_args,
3955 cur_java_tool_options_args,
3956 cur_java_options_args,
3957 cur_cmd_args);
3958
3959 if (result != JNI_OK) {
3960 return result;
3961 }
3962
3963 #if INCLUDE_CDS
3964 // Initialize shared archive paths which could include both base and dynamic archive paths
3965 if (!init_shared_archive_paths()) {
3966 return JNI_ENOMEM;
3967 }
3968 #endif
3969
3970 // Delay warning until here so that we've had a chance to process
3971 // the -XX:-PrintWarnings flag
3972 if (needs_hotspotrc_warning) {
3973 warning("%s file is present but has been ignored. "
3974 "Run with -XX:Flags=%s to load the file.",
3975 hotspotrc, hotspotrc);
3976 }
3977
3978 if (needs_module_property_warning) {
3979 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3980 " names that are reserved for internal use.");
3981 }
3982
3983 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3984 UNSUPPORTED_OPTION(UseLargePages);
3985 #endif
3986
3987 #if defined(AIX)
3988 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3989 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3990 #endif
3991
3992 #ifndef PRODUCT
3993 if (TraceBytecodesAt != 0) {
3994 TraceBytecodes = true;
3995 }
3996 if (CountCompiledCalls) {
3997 if (UseCounterDecay) {
3998 warning("UseCounterDecay disabled because CountCalls is set");
3999 UseCounterDecay = false;
4000 }
4001 }
4002 #endif // PRODUCT
4003
4004 if (ScavengeRootsInCode == 0) {
4005 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4006 warning("Forcing ScavengeRootsInCode non-zero");
4007 }
4008 ScavengeRootsInCode = 1;
4009 }
4010
4011 if (!handle_deprecated_print_gc_flags()) {
4012 return JNI_EINVAL;
4013 }
4014
4015 // Set object alignment values.
4016 set_object_alignment();
4017
4018 #if !INCLUDE_CDS
4019 if (DumpSharedSpaces || RequireSharedSpaces) {
4020 jio_fprintf(defaultStream::error_stream(),
4021 "Shared spaces are not supported in this VM\n");
4022 return JNI_ERR;
4023 }
4024 if (DumpLoadedClassList != NULL) {
4025 jio_fprintf(defaultStream::error_stream(),
4026 "DumpLoadedClassList is not supported in this VM\n");
4027 return JNI_ERR;
4028 }
4029 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4030 log_is_enabled(Info, cds)) {
4031 warning("Shared spaces are not supported in this VM");
4032 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4033 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4034 }
4035 no_shared_spaces("CDS Disabled");
4036 #endif // INCLUDE_CDS
4037
4038 #ifndef TIERED
4039 if (FLAG_IS_CMDLINE(CompilationMode)) {
4040 warning("CompilationMode has no effect in non-tiered VMs");
4041 }
4042 #endif
4043
4044 TSAN_RUNTIME_ONLY(
4045 // Currently TSAN is only implemented for interpreter.
4046 set_mode_flags(_int);
4047 // TSAN instrumentation is not implemented for the RewriteBytecodes
4048 // code paths because TSAN slows down the application so much that the
4049 // performance benefits from rewriting bytecodes is negligible.
4050 FLAG_SET_ERGO(RewriteBytecodes, false);
4051 FLAG_SET_ERGO(RewriteFrequentPairs, false);
4052 // Turn off CDS, it interferes with eagerly allocating jmethodIDs.
4053 no_shared_spaces("CDS is not compatible with TSAN");
4054 );
4055
4056 return JNI_OK;
4057 }
4058
4059 jint Arguments::apply_ergo() {
4060 // Set flags based on ergonomics.
4061 jint result = set_ergonomics_flags();
4062 if (result != JNI_OK) return result;
4063
4064 // Set heap size based on available physical memory
4065 set_heap_size();
4066
4067 GCConfig::arguments()->initialize();
4068
4069 set_shared_spaces_flags();
4070
4071 // Initialize Metaspace flags and alignments
4072 Metaspace::ergo_initialize();
4073
4074 // Set compiler flags after GC is selected and GC specific
4075 // flags (LoopStripMiningIter) are set.
4076 CompilerConfig::ergo_initialize();
4077
4078 // Set bytecode rewriting flags
4079 set_bytecode_flags();
4080
4081 // Set flags if aggressive optimization flags are enabled
4082 jint code = set_aggressive_opts_flags();
4083 if (code != JNI_OK) {
4084 return code;
4085 }
4086
4087 // Turn off biased locking for locking debug mode flags,
4088 // which are subtly different from each other but neither works with
4089 // biased locking
4090 if (UseHeavyMonitors
4091 #ifdef COMPILER1
4092 || !UseFastLocking
4093 #endif // COMPILER1
4094 #if INCLUDE_JVMCI
4095 || !JVMCIUseFastLocking
4096 #endif
4097 ) {
4098 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4099 // flag set to true on command line; warn the user that they
4100 // can't enable biased locking here
4101 warning("Biased Locking is not supported with locking debug flags"
4102 "; ignoring UseBiasedLocking flag." );
4103 }
4104 UseBiasedLocking = false;
4105 }
4106
4107 #ifdef CC_INTERP
4108 // Clear flags not supported on zero.
4109 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4110 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4111 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4112 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4113 #endif // CC_INTERP
4114
4115 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4116 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4117 DebugNonSafepoints = true;
4118 }
4119
4120 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4121 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4122 }
4123
4124 // Treat the odd case where local verification is enabled but remote
4125 // verification is not as if both were enabled.
4126 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4127 log_info(verification)("Turning on remote verification because local verification is on");
4128 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4129 }
4130
4131 #ifndef PRODUCT
4132 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4133 if (use_vm_log()) {
4134 LogVMOutput = true;
4135 }
4136 }
4137 #endif // PRODUCT
4138
4139 if (PrintCommandLineFlags) {
4140 JVMFlag::printSetFlags(tty);
4141 }
4142
4143 // Apply CPU specific policy for the BiasedLocking
4144 if (UseBiasedLocking) {
4145 if (!VM_Version::use_biased_locking() &&
4146 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4147 UseBiasedLocking = false;
4148 }
4149 }
4150 #ifdef COMPILER2
4151 if (!UseBiasedLocking) {
4152 UseOptoBiasInlining = false;
4153 }
4154 #endif
4155
4156 return JNI_OK;
4157 }
4158
4159 jint Arguments::adjust_after_os() {
4160 if (UseNUMA) {
4161 if (UseParallelGC) {
4162 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4163 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4164 }
4165 }
4166 // UseNUMAInterleaving is set to ON for all collectors and platforms when
4167 // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and
4168 // survivor spaces on top of NUMA allocation policy for the eden space.
4169 // Non NUMA-aware collectors will interleave all of the heap spaces across
4170 // NUMA nodes.
4171 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4172 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4173 }
4174 }
4175 return JNI_OK;
4176 }
4177
4178 int Arguments::PropertyList_count(SystemProperty* pl) {
4179 int count = 0;
4180 while(pl != NULL) {
4181 count++;
4182 pl = pl->next();
4183 }
4184 return count;
4185 }
4186
4187 // Return the number of readable properties.
4188 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4189 int count = 0;
4190 while(pl != NULL) {
4191 if (pl->is_readable()) {
4192 count++;
4193 }
4194 pl = pl->next();
4195 }
4196 return count;
4197 }
4198
4199 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4200 assert(key != NULL, "just checking");
4201 SystemProperty* prop;
4202 for (prop = pl; prop != NULL; prop = prop->next()) {
4203 if (strcmp(key, prop->key()) == 0) return prop->value();
4204 }
4205 return NULL;
4206 }
4207
4208 // Return the value of the requested property provided that it is a readable property.
4209 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4210 assert(key != NULL, "just checking");
4211 SystemProperty* prop;
4212 // Return the property value if the keys match and the property is not internal or
4213 // it's the special internal property "jdk.boot.class.path.append".
4214 for (prop = pl; prop != NULL; prop = prop->next()) {
4215 if (strcmp(key, prop->key()) == 0) {
4216 if (!prop->internal()) {
4217 return prop->value();
4218 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4219 return prop->value();
4220 } else {
4221 // Property is internal and not jdk.boot.class.path.append so return NULL.
4222 return NULL;
4223 }
4224 }
4225 }
4226 return NULL;
4227 }
4228
4229 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4230 int count = 0;
4231 const char* ret_val = NULL;
4232
4233 while(pl != NULL) {
4234 if(count >= index) {
4235 ret_val = pl->key();
4236 break;
4237 }
4238 count++;
4239 pl = pl->next();
4240 }
4241
4242 return ret_val;
4243 }
4244
4245 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4246 int count = 0;
4247 char* ret_val = NULL;
4248
4249 while(pl != NULL) {
4250 if(count >= index) {
4251 ret_val = pl->value();
4252 break;
4253 }
4254 count++;
4255 pl = pl->next();
4256 }
4257
4258 return ret_val;
4259 }
4260
4261 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4262 SystemProperty* p = *plist;
4263 if (p == NULL) {
4264 *plist = new_p;
4265 } else {
4266 while (p->next() != NULL) {
4267 p = p->next();
4268 }
4269 p->set_next(new_p);
4270 }
4271 }
4272
4273 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4274 bool writeable, bool internal) {
4275 if (plist == NULL)
4276 return;
4277
4278 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4279 PropertyList_add(plist, new_p);
4280 }
4281
4282 void Arguments::PropertyList_add(SystemProperty *element) {
4283 PropertyList_add(&_system_properties, element);
4284 }
4285
4286 // This add maintains unique property key in the list.
4287 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4288 PropertyAppendable append, PropertyWriteable writeable,
4289 PropertyInternal internal) {
4290 if (plist == NULL)
4291 return;
4292
4293 // If property key exist then update with new value.
4294 SystemProperty* prop;
4295 for (prop = *plist; prop != NULL; prop = prop->next()) {
4296 if (strcmp(k, prop->key()) == 0) {
4297 if (append == AppendProperty) {
4298 prop->append_value(v);
4299 } else {
4300 prop->set_value(v);
4301 }
4302 return;
4303 }
4304 }
4305
4306 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4307 }
4308
4309 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4310 // Returns true if all of the source pointed by src has been copied over to
4311 // the destination buffer pointed by buf. Otherwise, returns false.
4312 // Notes:
4313 // 1. If the length (buflen) of the destination buffer excluding the
4314 // NULL terminator character is not long enough for holding the expanded
4315 // pid characters, it also returns false instead of returning the partially
4316 // expanded one.
4317 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4318 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4319 char* buf, size_t buflen) {
4320 const char* p = src;
4321 char* b = buf;
4322 const char* src_end = &src[srclen];
4323 char* buf_end = &buf[buflen - 1];
4324
4325 while (p < src_end && b < buf_end) {
4326 if (*p == '%') {
4327 switch (*(++p)) {
4328 case '%': // "%%" ==> "%"
4329 *b++ = *p++;
4330 break;
4331 case 'p': { // "%p" ==> current process id
4332 // buf_end points to the character before the last character so
4333 // that we could write '\0' to the end of the buffer.
4334 size_t buf_sz = buf_end - b + 1;
4335 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4336
4337 // if jio_snprintf fails or the buffer is not long enough to hold
4338 // the expanded pid, returns false.
4339 if (ret < 0 || ret >= (int)buf_sz) {
4340 return false;
4341 } else {
4342 b += ret;
4343 assert(*b == '\0', "fail in copy_expand_pid");
4344 if (p == src_end && b == buf_end + 1) {
4345 // reach the end of the buffer.
4346 return true;
4347 }
4348 }
4349 p++;
4350 break;
4351 }
4352 default :
4353 *b++ = '%';
4354 }
4355 } else {
4356 *b++ = *p++;
4357 }
4358 }
4359 *b = '\0';
4360 return (p == src_end); // return false if not all of the source was copied
4361 }