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