1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "logging/logStream.hpp"
37 #include "logging/logTag.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/flags/jvmFlagConstraintList.hpp"
45 #include "runtime/flags/jvmFlagRangeList.hpp"
46 #include "runtime/globals_extension.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/os.inline.hpp"
49 #include "runtime/safepoint.hpp"
50 #include "runtime/safepointMechanism.hpp"
51 #include "runtime/vm_version.hpp"
52 #include "services/management.hpp"
53 #include "services/memTracker.hpp"
54 #include "utilities/align.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/powerOfTwo.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JFR
60 #include "jfr/jfr.hpp"
61 #endif
62
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 char* Arguments::_jvm_flags_file = NULL;
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 size_t Arguments::_conservative_max_heap_alignment = 0;
74 Arguments::Mode Arguments::_mode = _mixed;
75 bool Arguments::_java_compiler = false;
76 bool Arguments::_xdebug_mode = false;
77 const char* Arguments::_java_vendor_url_bug = NULL;
78 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
79 bool Arguments::_sun_java_launcher_is_altjvm = false;
80
81 // These parameters are reset in method parse_vm_init_args()
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
87 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
88 size_t Arguments::_SharedBaseAddress = SharedBaseAddress;
89
90 bool Arguments::_enable_preview = false;
91
92 char* Arguments::SharedArchivePath = NULL;
93 char* Arguments::SharedDynamicArchivePath = NULL;
94
95 AgentLibraryList Arguments::_libraryList;
96 AgentLibraryList Arguments::_agentList;
97
98 // These are not set by the JDK's built-in launchers, but they can be set by
99 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
100 // JavaVMOption in jni.h.
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
111 SystemProperty *Arguments::_vm_info = NULL;
112
113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
114 PathString *Arguments::_system_boot_class_path = NULL;
115 bool Arguments::_has_jimage = false;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 bool PathString::set_value(const char *value) {
120 if (_value != NULL) {
121 FreeHeap(_value);
122 }
123 _value = AllocateHeap(strlen(value)+1, mtArguments);
124 assert(_value != NULL, "Unable to allocate space for new path value");
125 if (_value != NULL) {
126 strcpy(_value, value);
127 } else {
128 // not able to allocate
129 return false;
130 }
131 return true;
132 }
133
134 void PathString::append_value(const char *value) {
135 char *sp;
136 size_t len = 0;
137 if (value != NULL) {
138 len = strlen(value);
139 if (_value != NULL) {
140 len += strlen(_value);
141 }
142 sp = AllocateHeap(len+2, mtArguments);
143 assert(sp != NULL, "Unable to allocate space for new append path value");
144 if (sp != NULL) {
145 if (_value != NULL) {
146 strcpy(sp, _value);
147 strcat(sp, os::path_separator());
148 strcat(sp, value);
149 FreeHeap(_value);
150 } else {
151 strcpy(sp, value);
152 }
153 _value = sp;
154 }
155 }
156 }
157
158 PathString::PathString(const char* value) {
159 if (value == NULL) {
160 _value = NULL;
161 } else {
162 _value = AllocateHeap(strlen(value)+1, mtArguments);
163 strcpy(_value, value);
164 }
165 }
166
167 PathString::~PathString() {
168 if (_value != NULL) {
169 FreeHeap(_value);
170 _value = NULL;
171 }
172 }
173
174 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
175 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
176 size_t len = strlen(module_name) + 1;
177 _module_name = AllocateHeap(len, mtInternal);
178 strncpy(_module_name, module_name, len); // copy the trailing null
179 _path = new PathString(path);
180 }
181
182 ModulePatchPath::~ModulePatchPath() {
183 if (_module_name != NULL) {
184 FreeHeap(_module_name);
185 _module_name = NULL;
186 }
187 if (_path != NULL) {
188 delete _path;
189 _path = NULL;
190 }
191 }
192
193 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
194 if (key == NULL) {
195 _key = NULL;
196 } else {
197 _key = AllocateHeap(strlen(key)+1, mtArguments);
198 strcpy(_key, key);
199 }
200 _next = NULL;
201 _internal = internal;
202 _writeable = writeable;
203 }
204
205 AgentLibrary::AgentLibrary(const char* name, const char* options,
206 bool is_absolute_path, void* os_lib,
207 bool instrument_lib) {
208 _name = AllocateHeap(strlen(name)+1, mtArguments);
209 strcpy(_name, name);
210 if (options == NULL) {
211 _options = NULL;
212 } else {
213 _options = AllocateHeap(strlen(options)+1, mtArguments);
214 strcpy(_options, options);
215 }
216 _is_absolute_path = is_absolute_path;
217 _os_lib = os_lib;
218 _next = NULL;
219 _state = agent_invalid;
220 _is_static_lib = false;
221 _is_instrument_lib = instrument_lib;
222 }
223
224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
225 // part of the option string.
226 static bool match_option(const JavaVMOption *option, const char* name,
227 const char** tail) {
228 size_t len = strlen(name);
229 if (strncmp(option->optionString, name, len) == 0) {
230 *tail = option->optionString + len;
231 return true;
232 } else {
233 return false;
234 }
235 }
236
237 // Check if 'option' matches 'name'. No "tail" is allowed.
238 static bool match_option(const JavaVMOption *option, const char* name) {
239 const char* tail = NULL;
240 bool result = match_option(option, name, &tail);
241 if (tail != NULL && *tail == '\0') {
242 return result;
243 } else {
244 return false;
245 }
246 }
247
248 // Return true if any of the strings in null-terminated array 'names' matches.
249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
250 // the option must match exactly.
251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
252 bool tail_allowed) {
253 for (/* empty */; *names != NULL; ++names) {
254 if (match_option(option, *names, tail)) {
255 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
256 return true;
257 }
258 }
259 }
260 return false;
261 }
262
263 #if INCLUDE_JFR
264 static bool _has_jfr_option = false; // is using JFR
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != NULL, "invariant");
269 char* tail = NULL;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_start_flight_recording_option(option, tail);
273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_flight_recorder_option(option, tail);
276 }
277 return false;
278 }
279
280 bool Arguments::has_jfr_option() {
281 return _has_jfr_option;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
330 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
331 return ((strncmp(option, property, len) == 0) &&
332 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
333 }
334
335 // Return true if property starts with "jdk.module." and its ensuing chars match
336 // any of the reserved module properties.
337 // property should be passed without the leading "-D".
338 bool Arguments::is_internal_module_property(const char* property) {
339 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
340 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
341 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
342 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
343 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
344 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
345 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
346 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
348 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
349 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
350 return true;
351 }
352 }
353 return false;
354 }
355
356 // Process java launcher properties.
357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
359 // Must do this before setting up other system properties,
360 // as some of them may depend on launcher type.
361 for (int index = 0; index < args->nOptions; index++) {
362 const JavaVMOption* option = args->options + index;
363 const char* tail;
364
365 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
366 process_java_launcher_argument(tail, option->extraInfo);
367 continue;
368 }
369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
370 if (strcmp(tail, "true") == 0) {
371 _sun_java_launcher_is_altjvm = true;
372 }
373 continue;
374 }
375 }
376 }
377
378 // Initialize system properties key and value.
379 void Arguments::init_system_properties() {
380
381 // Set up _system_boot_class_path which is not a property but
382 // relies heavily on argument processing and the jdk.boot.class.path.append
383 // property. It is used to store the underlying system boot class path.
384 _system_boot_class_path = new PathString(NULL);
385
386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
387 "Java Virtual Machine Specification", false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
391
392 // Initialize the vm.info now, but it will need updating after argument parsing.
393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to NULL and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
399 _java_library_path = new SystemProperty("java.library.path", NULL, true);
400 _java_home = new SystemProperty("java.home", NULL, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414 PropertyList_add(&_system_properties, _vm_info);
415
416 // Set OS specific system properties values
417 os::init_system_properties_values();
418 }
419
420 // Update/Initialize System properties after JDK version number is known
421 void Arguments::init_version_specific_system_properties() {
422 enum { bufsz = 16 };
423 char buffer[bufsz];
424 const char* spec_vendor = "Oracle Corporation";
425 uint32_t spec_version = JDK_Version::current().major_version();
426
427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
428
429 PropertyList_add(&_system_properties,
430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.version", buffer, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
435 }
436
437 /*
438 * -XX argument processing:
439 *
440 * -XX arguments are defined in several places, such as:
441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
442 * -XX arguments are parsed in parse_argument().
443 * -XX argument bounds checking is done in check_vm_args_consistency().
444 *
445 * Over time -XX arguments may change. There are mechanisms to handle common cases:
446 *
447 * ALIASED: An option that is simply another name for another option. This is often
448 * part of the process of deprecating a flag, but not all aliases need
449 * to be deprecated.
450 *
451 * Create an alias for an option by adding the old and new option names to the
452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
453 *
454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
455 * support may be removed in the future. Both regular and aliased options may be
456 * deprecated.
457 *
458 * Add a deprecation warning for an option (or alias) by adding an entry in the
459 * "special_jvm_flags" table and setting the "deprecated_in" field.
460 * Often an option "deprecated" in one major release will
461 * be made "obsolete" in the next. In this case the entry should also have its
462 * "obsolete_in" field set.
463 *
464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
465 * on the command line. A warning is printed to let the user know that option might not
466 * be accepted in the future.
467 *
468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
469 * table and setting the "obsolete_in" field.
470 *
471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
472 * to the current JDK version. The system will flatly refuse to admit the existence of
473 * the flag. This allows a flag to die automatically over JDK releases.
474 *
475 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
477 * - Newly obsolete or expired deprecated options should have their global variable
478 * definitions removed (from globals.hpp, etc) and related implementations removed.
479 *
480 * Recommended approach for removing options:
481 *
482 * To remove options commonly used by customers (e.g. product -XX options), use
483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
484 *
485 * To remove internal options (e.g. diagnostic, experimental, develop options), use
486 * a 2-step model adding major release numbers to the obsolete and expire columns.
487 *
488 * To change the name of an option, use the alias table as well as a 2-step
489 * model adding major release numbers to the deprecate and expire columns.
490 * Think twice about aliasing commonly used customer options.
491 *
492 * There are times when it is appropriate to leave a future release number as undefined.
493 *
494 * Tests: Aliases should be tested in VMAliasOptions.java.
495 * Deprecated options should be tested in VMDeprecatedOptions.java.
496 */
497
498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
501 // the command-line as usual, but will issue a warning.
502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
503 // the command-line, while issuing a warning and ignoring the flag value.
504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
505 // existence of the flag.
506 //
507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
508 // This table ensures that the handling of options will update automatically when the JDK
509 // version is incremented, but the source code needs to be cleanup up manually:
510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
511 // variable should be removed, as well as users of the variable.
512 // - As "deprecated" options age into "obsolete" options, move the entry into the
513 // "Obsolete Flags" section of the table.
514 // - All expired options should be removed from the table.
515 static SpecialFlag const special_jvm_flags[] = {
516 // -------------- Deprecated Flags --------------
517 // --- Non-alias flags - sorted by obsolete_in then expired_in:
518 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
523 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
526 { "PrintVMQWaitTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
527 { "UseNewFieldLayout", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
528
529 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
530 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
533
534 // -------------- Obsolete Flags - sorted by expired_in --------------
535 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
536 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
537 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
538 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
539 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
540 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
541 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
542 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
543 { "GCTaskTimeStampEntries", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
544 { "G1RSetScanBlockSize", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
545 { "UseParallelOldGC", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
546 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
547 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
548 #ifndef X86
549 { "UseSSE", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
550 #endif // !X86
551 { "UseAdaptiveGCBoundary", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
552
553 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
554 // These entries will generate build errors. Their purpose is to test the macros.
555 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
556 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
557 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
558 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
559 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
560 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
562 #endif
563
564 { NULL, JDK_Version(0), JDK_Version(0) }
565 };
566
567 // Flags that are aliases for other flags.
568 typedef struct {
569 const char* alias_name;
570 const char* real_name;
571 } AliasedFlag;
572
573 static AliasedFlag const aliased_jvm_flags[] = {
574 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
575 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
576 { NULL, NULL}
577 };
578
579 // NOTE: A compatibility request will be necessary for each alias to be removed.
580 static AliasedLoggingFlag const aliased_logging_flags[] = {
581 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
582 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
583 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
584 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
585 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
586 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
587 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
588 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
589 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
590 { "TraceInvokeDynamic", LogLevel::Debug, true, LOG_TAGS(methodhandles, indy) },
591 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
592 { "TraceMethodHandles", LogLevel::Info, true, LOG_TAGS(methodhandles) },
593 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
594 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
595 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
596 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
597 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
598 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
599 };
600
601 #ifndef PRODUCT
602 // These options are removed in jdk9. Remove this code for jdk10.
603 static AliasedFlag const removed_develop_logging_flags[] = {
604 { "TraceClassInitialization", "-Xlog:class+init" },
605 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
606 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
607 { "TraceItables", "-Xlog:itables=debug" },
608 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
609 { "TraceSafepoint", "-Xlog:safepoint=debug" },
610 { "TraceStartupTime", "-Xlog:startuptime" },
611 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
612 { "PrintVtables", "-Xlog:vtables=debug" },
613 { "VerboseVerification", "-Xlog:verification" },
614 { NULL, NULL }
615 };
616 #endif //PRODUCT
617
618 // Return true if "v" is less than "other", where "other" may be "undefined".
619 static bool version_less_than(JDK_Version v, JDK_Version other) {
620 assert(!v.is_undefined(), "must be defined");
621 if (!other.is_undefined() && v.compare(other) >= 0) {
622 return false;
623 } else {
624 return true;
625 }
626 }
627
628 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
629 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
630 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
631 flag = special_jvm_flags[i];
632 return true;
633 }
634 }
635 return false;
636 }
637
638 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
639 assert(version != NULL, "Must provide a version buffer");
640 SpecialFlag flag;
641 if (lookup_special_flag(flag_name, flag)) {
642 if (!flag.obsolete_in.is_undefined()) {
643 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
644 *version = flag.obsolete_in;
645 // This flag may have been marked for obsoletion in this version, but we may not
646 // have actually removed it yet. Rather than ignoring it as soon as we reach
647 // this version we allow some time for the removal to happen. So if the flag
648 // still actually exists we process it as normal, but issue an adjusted warning.
649 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
650 if (real_flag != NULL) {
651 char version_str[256];
652 version->to_string(version_str, sizeof(version_str));
653 warning("Temporarily processing option %s; support is scheduled for removal in %s",
654 flag_name, version_str);
655 return false;
656 }
657 return true;
658 }
659 }
660 }
661 return false;
662 }
663
664 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
665 assert(version != NULL, "Must provide a version buffer");
666 SpecialFlag flag;
667 if (lookup_special_flag(flag_name, flag)) {
668 if (!flag.deprecated_in.is_undefined()) {
669 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
670 version_less_than(JDK_Version::current(), flag.expired_in)) {
671 *version = flag.deprecated_in;
672 return 1;
673 } else {
674 return -1;
675 }
676 }
677 }
678 return 0;
679 }
680
681 #ifndef PRODUCT
682 const char* Arguments::removed_develop_logging_flag_name(const char* name){
683 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
684 const AliasedFlag& flag = removed_develop_logging_flags[i];
685 if (strcmp(flag.alias_name, name) == 0) {
686 return flag.real_name;
687 }
688 }
689 return NULL;
690 }
691 #endif // PRODUCT
692
693 const char* Arguments::real_flag_name(const char *flag_name) {
694 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
695 const AliasedFlag& flag_status = aliased_jvm_flags[i];
696 if (strcmp(flag_status.alias_name, flag_name) == 0) {
697 return flag_status.real_name;
698 }
699 }
700 return flag_name;
701 }
702
703 #ifdef ASSERT
704 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
705 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
706 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
707 return true;
708 }
709 }
710 return false;
711 }
712
713 // Verifies the correctness of the entries in the special_jvm_flags table.
714 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
715 // version being earlier than the deprecation version, then a warning is issued
716 // and verification fails - by returning false. If it is detected that the table
717 // is out of date, with respect to the current version, then ideally a warning is
718 // issued but verification does not fail. This allows the VM to operate when the
719 // version is first updated, without needing to update all the impacted flags at
720 // the same time. In practice we can't issue the warning immediately when the version
721 // is updated as it occurs for every test and some tests are not prepared to handle
722 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
723 // if the check_globals flag is true, and in addition allow a grace period and only
724 // check for stale flags when we hit build 25 (which is far enough into the 6 month
725 // release cycle that all flag updates should have been processed, whilst still
726 // leaving time to make the change before RDP2).
727 // We use a gtest to call this, passing true, so that we can detect stale flags before
728 // the end of the release cycle.
729
730 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
731
732 bool Arguments::verify_special_jvm_flags(bool check_globals) {
733 bool success = true;
734 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
735 const SpecialFlag& flag = special_jvm_flags[i];
736 if (lookup_special_flag(flag.name, i)) {
737 warning("Duplicate special flag declaration \"%s\"", flag.name);
738 success = false;
739 }
740 if (flag.deprecated_in.is_undefined() &&
741 flag.obsolete_in.is_undefined()) {
742 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
743 success = false;
744 }
745
746 if (!flag.deprecated_in.is_undefined()) {
747 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
748 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
749 success = false;
750 }
751
752 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
753 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
754 success = false;
755 }
756 }
757
758 if (!flag.obsolete_in.is_undefined()) {
759 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
760 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
761 success = false;
762 }
763
764 // if flag has become obsolete it should not have a "globals" flag defined anymore.
765 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
766 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
767 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
768 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
769 success = false;
770 }
771 }
772
773 } else if (!flag.expired_in.is_undefined()) {
774 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
775 success = false;
776 }
777
778 if (!flag.expired_in.is_undefined()) {
779 // if flag has become expired it should not have a "globals" flag defined anymore.
780 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
781 !version_less_than(JDK_Version::current(), flag.expired_in)) {
782 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
783 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
784 success = false;
785 }
786 }
787 }
788 }
789 return success;
790 }
791 #endif
792
793 // Parses a size specification string.
794 bool Arguments::atojulong(const char *s, julong* result) {
795 julong n = 0;
796
797 // First char must be a digit. Don't allow negative numbers or leading spaces.
798 if (!isdigit(*s)) {
799 return false;
800 }
801
802 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
803 char* remainder;
804 errno = 0;
805 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
806 if (errno != 0) {
807 return false;
808 }
809
810 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
811 if (remainder == s || strlen(remainder) > 1) {
812 return false;
813 }
814
815 switch (*remainder) {
816 case 'T': case 't':
817 *result = n * G * K;
818 // Check for overflow.
819 if (*result/((julong)G * K) != n) return false;
820 return true;
821 case 'G': case 'g':
822 *result = n * G;
823 if (*result/G != n) return false;
824 return true;
825 case 'M': case 'm':
826 *result = n * M;
827 if (*result/M != n) return false;
828 return true;
829 case 'K': case 'k':
830 *result = n * K;
831 if (*result/K != n) return false;
832 return true;
833 case '\0':
834 *result = n;
835 return true;
836 default:
837 return false;
838 }
839 }
840
841 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
842 if (size < min_size) return arg_too_small;
843 if (size > max_size) return arg_too_big;
844 return arg_in_range;
845 }
846
847 // Describe an argument out of range error
848 void Arguments::describe_range_error(ArgsRange errcode) {
849 switch(errcode) {
850 case arg_too_big:
851 jio_fprintf(defaultStream::error_stream(),
852 "The specified size exceeds the maximum "
853 "representable size.\n");
854 break;
855 case arg_too_small:
856 case arg_unreadable:
857 case arg_in_range:
858 // do nothing for now
859 break;
860 default:
861 ShouldNotReachHere();
862 }
863 }
864
865 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
866 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
867 return true;
868 } else {
869 return false;
870 }
871 }
872
873 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
874 char* end;
875 errno = 0;
876 double v = strtod(value, &end);
877 if ((errno != 0) || (*end != 0)) {
878 return false;
879 }
880
881 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
882 return true;
883 }
884 return false;
885 }
886
887 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
888 julong v;
889 int int_v;
890 intx intx_v;
891 bool is_neg = false;
892
893 if (flag == NULL) {
894 return false;
895 }
896
897 // Check the sign first since atojulong() parses only unsigned values.
898 if (*value == '-') {
899 if (!flag->is_intx() && !flag->is_int()) {
900 return false;
901 }
902 value++;
903 is_neg = true;
904 }
905 if (!Arguments::atojulong(value, &v)) {
906 return false;
907 }
908 if (flag->is_int()) {
909 int_v = (int) v;
910 if (is_neg) {
911 int_v = -int_v;
912 }
913 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
914 } else if (flag->is_uint()) {
915 uint uint_v = (uint) v;
916 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
917 } else if (flag->is_intx()) {
918 intx_v = (intx) v;
919 if (is_neg) {
920 intx_v = -intx_v;
921 }
922 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
923 } else if (flag->is_uintx()) {
924 uintx uintx_v = (uintx) v;
925 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
926 } else if (flag->is_uint64_t()) {
927 uint64_t uint64_t_v = (uint64_t) v;
928 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
929 } else if (flag->is_size_t()) {
930 size_t size_t_v = (size_t) v;
931 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
932 } else if (flag->is_double()) {
933 double double_v = (double) v;
934 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
935 } else {
936 return false;
937 }
938 }
939
940 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
941 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
942 // Contract: JVMFlag always returns a pointer that needs freeing.
943 FREE_C_HEAP_ARRAY(char, value);
944 return true;
945 }
946
947 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
948 const char* old_value = "";
949 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
950 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
951 size_t new_len = strlen(new_value);
952 const char* value;
953 char* free_this_too = NULL;
954 if (old_len == 0) {
955 value = new_value;
956 } else if (new_len == 0) {
957 value = old_value;
958 } else {
959 size_t length = old_len + 1 + new_len + 1;
960 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
961 // each new setting adds another LINE to the switch:
962 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
963 value = buf;
964 free_this_too = buf;
965 }
966 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
967 // JVMFlag always returns a pointer that needs freeing.
968 FREE_C_HEAP_ARRAY(char, value);
969 // JVMFlag made its own copy, so I must delete my own temp. buffer.
970 FREE_C_HEAP_ARRAY(char, free_this_too);
971 return true;
972 }
973
974 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
975 const char* real_name = real_flag_name(arg);
976 JDK_Version since = JDK_Version();
977 switch (is_deprecated_flag(arg, &since)) {
978 case -1: {
979 // Obsolete or expired, so don't process normally,
980 // but allow for an obsolete flag we're still
981 // temporarily allowing.
982 if (!is_obsolete_flag(arg, &since)) {
983 return real_name;
984 }
985 // Note if we're not considered obsolete then we can't be expired either
986 // as obsoletion must come first.
987 return NULL;
988 }
989 case 0:
990 return real_name;
991 case 1: {
992 if (warn) {
993 char version[256];
994 since.to_string(version, sizeof(version));
995 if (real_name != arg) {
996 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
997 arg, version, real_name);
998 } else {
999 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1000 arg, version);
1001 }
1002 }
1003 return real_name;
1004 }
1005 }
1006 ShouldNotReachHere();
1007 return NULL;
1008 }
1009
1010 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1011 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1012 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1013 const int max_tagset_size = 256;
1014 int max_tagset_len = max_tagset_size - 1;
1015 char tagset_buffer[max_tagset_size];
1016 tagset_buffer[0] = '\0';
1017
1018 // Write tag-set for aliased logging option, in string list form
1019 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1020 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1021 if (i > 0) {
1022 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1023 }
1024 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1025 }
1026 if (!alf.exactMatch) {
1027 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1028 }
1029 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1030 (on) ? "+" : "-",
1031 name,
1032 tagset_buffer,
1033 (on) ? LogLevel::name(alf.level) : "off");
1034 }
1035
1036 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1037 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1038 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1039 if (strcmp(alf.alias_name, name) == 0) {
1040 log_deprecated_flag(name, on, alf);
1041 return alf;
1042 }
1043 }
1044 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1045 return a;
1046 }
1047
1048 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1049
1050 // range of acceptable characters spelled out for portability reasons
1051 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1052 #define BUFLEN 255
1053 char name[BUFLEN+1];
1054 char dummy;
1055 const char* real_name;
1056 bool warn_if_deprecated = true;
1057
1058 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1059 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1060 if (alf.alias_name != NULL){
1061 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1062 return true;
1063 }
1064 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1065 if (real_name == NULL) {
1066 return false;
1067 }
1068 JVMFlag* flag = JVMFlag::find_flag(real_name);
1069 return set_bool_flag(flag, false, origin);
1070 }
1071 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1072 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1073 if (alf.alias_name != NULL){
1074 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1075 return true;
1076 }
1077 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1078 if (real_name == NULL) {
1079 return false;
1080 }
1081 JVMFlag* flag = JVMFlag::find_flag(real_name);
1082 return set_bool_flag(flag, true, origin);
1083 }
1084
1085 char punct;
1086 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1087 const char* value = strchr(arg, '=') + 1;
1088
1089 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1090 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1091 if (alf.alias_name != NULL) {
1092 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1093 return true;
1094 }
1095 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1096 if (real_name == NULL) {
1097 return false;
1098 }
1099 JVMFlag* flag = JVMFlag::find_flag(real_name);
1100 if (flag != NULL && flag->is_ccstr()) {
1101 if (flag->ccstr_accumulates()) {
1102 return append_to_string_flag(flag, value, origin);
1103 } else {
1104 if (value[0] == '\0') {
1105 value = NULL;
1106 }
1107 return set_string_flag(flag, value, origin);
1108 }
1109 } else {
1110 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1111 }
1112 }
1113
1114 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1115 const char* value = strchr(arg, '=') + 1;
1116 // -XX:Foo:=xxx will reset the string flag to the given value.
1117 if (value[0] == '\0') {
1118 value = NULL;
1119 }
1120 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1121 if (real_name == NULL) {
1122 return false;
1123 }
1124 JVMFlag* flag = JVMFlag::find_flag(real_name);
1125 return set_string_flag(flag, value, origin);
1126 }
1127
1128 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1129 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1130 #define NUMBER_RANGE "[0123456789eE+-]"
1131 char value[BUFLEN + 1];
1132 char value2[BUFLEN + 1];
1133 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1134 // Looks like a floating-point number -- try again with more lenient format string
1135 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1136 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1137 if (real_name == NULL) {
1138 return false;
1139 }
1140 JVMFlag* flag = JVMFlag::find_flag(real_name);
1141 return set_fp_numeric_flag(flag, value, origin);
1142 }
1143 }
1144
1145 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1146 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1147 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1148 if (real_name == NULL) {
1149 return false;
1150 }
1151 JVMFlag* flag = JVMFlag::find_flag(real_name);
1152 return set_numeric_flag(flag, value, origin);
1153 }
1154
1155 return false;
1156 }
1157
1158 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1159 assert(bldarray != NULL, "illegal argument");
1160
1161 if (arg == NULL) {
1162 return;
1163 }
1164
1165 int new_count = *count + 1;
1166
1167 // expand the array and add arg to the last element
1168 if (*bldarray == NULL) {
1169 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1170 } else {
1171 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1172 }
1173 (*bldarray)[*count] = os::strdup_check_oom(arg);
1174 *count = new_count;
1175 }
1176
1177 void Arguments::build_jvm_args(const char* arg) {
1178 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1179 }
1180
1181 void Arguments::build_jvm_flags(const char* arg) {
1182 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1183 }
1184
1185 // utility function to return a string that concatenates all
1186 // strings in a given char** array
1187 const char* Arguments::build_resource_string(char** args, int count) {
1188 if (args == NULL || count == 0) {
1189 return NULL;
1190 }
1191 size_t length = 0;
1192 for (int i = 0; i < count; i++) {
1193 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1194 }
1195 char* s = NEW_RESOURCE_ARRAY(char, length);
1196 char* dst = s;
1197 for (int j = 0; j < count; j++) {
1198 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1199 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1200 dst += offset;
1201 length -= offset;
1202 }
1203 return (const char*) s;
1204 }
1205
1206 void Arguments::print_on(outputStream* st) {
1207 st->print_cr("VM Arguments:");
1208 if (num_jvm_flags() > 0) {
1209 st->print("jvm_flags: "); print_jvm_flags_on(st);
1210 st->cr();
1211 }
1212 if (num_jvm_args() > 0) {
1213 st->print("jvm_args: "); print_jvm_args_on(st);
1214 st->cr();
1215 }
1216 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1217 if (_java_class_path != NULL) {
1218 char* path = _java_class_path->value();
1219 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1220 }
1221 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1222 }
1223
1224 void Arguments::print_summary_on(outputStream* st) {
1225 // Print the command line. Environment variables that are helpful for
1226 // reproducing the problem are written later in the hs_err file.
1227 // flags are from setting file
1228 if (num_jvm_flags() > 0) {
1229 st->print_raw("Settings File: ");
1230 print_jvm_flags_on(st);
1231 st->cr();
1232 }
1233 // args are the command line and environment variable arguments.
1234 st->print_raw("Command Line: ");
1235 if (num_jvm_args() > 0) {
1236 print_jvm_args_on(st);
1237 }
1238 // this is the classfile and any arguments to the java program
1239 if (java_command() != NULL) {
1240 st->print("%s", java_command());
1241 }
1242 st->cr();
1243 }
1244
1245 void Arguments::print_jvm_flags_on(outputStream* st) {
1246 if (_num_jvm_flags > 0) {
1247 for (int i=0; i < _num_jvm_flags; i++) {
1248 st->print("%s ", _jvm_flags_array[i]);
1249 }
1250 }
1251 }
1252
1253 void Arguments::print_jvm_args_on(outputStream* st) {
1254 if (_num_jvm_args > 0) {
1255 for (int i=0; i < _num_jvm_args; i++) {
1256 st->print("%s ", _jvm_args_array[i]);
1257 }
1258 }
1259 }
1260
1261 bool Arguments::process_argument(const char* arg,
1262 jboolean ignore_unrecognized,
1263 JVMFlag::Flags origin) {
1264 JDK_Version since = JDK_Version();
1265
1266 if (parse_argument(arg, origin)) {
1267 return true;
1268 }
1269
1270 // Determine if the flag has '+', '-', or '=' characters.
1271 bool has_plus_minus = (*arg == '+' || *arg == '-');
1272 const char* const argname = has_plus_minus ? arg + 1 : arg;
1273
1274 size_t arg_len;
1275 const char* equal_sign = strchr(argname, '=');
1276 if (equal_sign == NULL) {
1277 arg_len = strlen(argname);
1278 } else {
1279 arg_len = equal_sign - argname;
1280 }
1281
1282 // Only make the obsolete check for valid arguments.
1283 if (arg_len <= BUFLEN) {
1284 // Construct a string which consists only of the argument name without '+', '-', or '='.
1285 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1286 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1287 if (is_obsolete_flag(stripped_argname, &since)) {
1288 char version[256];
1289 since.to_string(version, sizeof(version));
1290 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1291 return true;
1292 }
1293 #ifndef PRODUCT
1294 else {
1295 const char* replacement;
1296 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1297 log_warning(arguments)("%s has been removed. Please use %s instead.",
1298 stripped_argname,
1299 replacement);
1300 return false;
1301 }
1302 }
1303 #endif //PRODUCT
1304 }
1305
1306 // For locked flags, report a custom error message if available.
1307 // Otherwise, report the standard unrecognized VM option.
1308 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1309 if (found_flag != NULL) {
1310 char locked_message_buf[BUFLEN];
1311 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1312 if (strlen(locked_message_buf) == 0) {
1313 if (found_flag->is_bool() && !has_plus_minus) {
1314 jio_fprintf(defaultStream::error_stream(),
1315 "Missing +/- setting for VM option '%s'\n", argname);
1316 } else if (!found_flag->is_bool() && has_plus_minus) {
1317 jio_fprintf(defaultStream::error_stream(),
1318 "Unexpected +/- setting in VM option '%s'\n", argname);
1319 } else {
1320 jio_fprintf(defaultStream::error_stream(),
1321 "Improperly specified VM option '%s'\n", argname);
1322 }
1323 } else {
1324 #ifdef PRODUCT
1325 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1326 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1327 if (ignore_unrecognized && mismatched) {
1328 return true;
1329 }
1330 #endif
1331 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1332 }
1333 } else {
1334 if (ignore_unrecognized) {
1335 return true;
1336 }
1337 jio_fprintf(defaultStream::error_stream(),
1338 "Unrecognized VM option '%s'\n", argname);
1339 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1340 if (fuzzy_matched != NULL) {
1341 jio_fprintf(defaultStream::error_stream(),
1342 "Did you mean '%s%s%s'? ",
1343 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1344 fuzzy_matched->_name,
1345 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1346 }
1347 }
1348
1349 // allow for commandline "commenting out" options like -XX:#+Verbose
1350 return arg[0] == '#';
1351 }
1352
1353 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1354 FILE* stream = fopen(file_name, "rb");
1355 if (stream == NULL) {
1356 if (should_exist) {
1357 jio_fprintf(defaultStream::error_stream(),
1358 "Could not open settings file %s\n", file_name);
1359 return false;
1360 } else {
1361 return true;
1362 }
1363 }
1364
1365 char token[1024];
1366 int pos = 0;
1367
1368 bool in_white_space = true;
1369 bool in_comment = false;
1370 bool in_quote = false;
1371 char quote_c = 0;
1372 bool result = true;
1373
1374 int c = getc(stream);
1375 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1376 if (in_white_space) {
1377 if (in_comment) {
1378 if (c == '\n') in_comment = false;
1379 } else {
1380 if (c == '#') in_comment = true;
1381 else if (!isspace(c)) {
1382 in_white_space = false;
1383 token[pos++] = c;
1384 }
1385 }
1386 } else {
1387 if (c == '\n' || (!in_quote && isspace(c))) {
1388 // token ends at newline, or at unquoted whitespace
1389 // this allows a way to include spaces in string-valued options
1390 token[pos] = '\0';
1391 logOption(token);
1392 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1393 build_jvm_flags(token);
1394 pos = 0;
1395 in_white_space = true;
1396 in_quote = false;
1397 } else if (!in_quote && (c == '\'' || c == '"')) {
1398 in_quote = true;
1399 quote_c = c;
1400 } else if (in_quote && (c == quote_c)) {
1401 in_quote = false;
1402 } else {
1403 token[pos++] = c;
1404 }
1405 }
1406 c = getc(stream);
1407 }
1408 if (pos > 0) {
1409 token[pos] = '\0';
1410 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1411 build_jvm_flags(token);
1412 }
1413 fclose(stream);
1414 return result;
1415 }
1416
1417 //=============================================================================================================
1418 // Parsing of properties (-D)
1419
1420 const char* Arguments::get_property(const char* key) {
1421 return PropertyList_get_value(system_properties(), key);
1422 }
1423
1424 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1425 const char* eq = strchr(prop, '=');
1426 const char* key;
1427 const char* value = "";
1428
1429 if (eq == NULL) {
1430 // property doesn't have a value, thus use passed string
1431 key = prop;
1432 } else {
1433 // property have a value, thus extract it and save to the
1434 // allocated string
1435 size_t key_len = eq - prop;
1436 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1437
1438 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1439 key = tmp_key;
1440
1441 value = &prop[key_len + 1];
1442 }
1443
1444 if (strcmp(key, "java.compiler") == 0) {
1445 process_java_compiler_argument(value);
1446 // Record value in Arguments, but let it get passed to Java.
1447 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1448 // sun.java.launcher.is_altjvm property is
1449 // private and is processed in process_sun_java_launcher_properties();
1450 // the sun.java.launcher property is passed on to the java application
1451 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1452 // append is true, writable is true, internal is false
1453 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1454 WriteableProperty, ExternalProperty);
1455 } else {
1456 if (strcmp(key, "sun.java.command") == 0) {
1457 char *old_java_command = _java_command;
1458 _java_command = os::strdup_check_oom(value, mtArguments);
1459 if (old_java_command != NULL) {
1460 os::free(old_java_command);
1461 }
1462 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1463 // If this property is set on the command line then its value will be
1464 // displayed in VM error logs as the URL at which to submit such logs.
1465 // Normally the URL displayed in error logs is different from the value
1466 // of this system property, so a different property should have been
1467 // used here, but we leave this as-is in case someone depends upon it.
1468 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1469 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1470 // its value without going through the property list or making a Java call.
1471 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1472 if (old_java_vendor_url_bug != NULL) {
1473 os::free((void *)old_java_vendor_url_bug);
1474 }
1475 }
1476
1477 // Create new property and add at the end of the list
1478 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1479 }
1480
1481 if (key != prop) {
1482 // SystemProperty copy passed value, thus free previously allocated
1483 // memory
1484 FreeHeap((void *)key);
1485 }
1486
1487 return true;
1488 }
1489
1490 #if INCLUDE_CDS
1491 const char* unsupported_properties[] = { "jdk.module.limitmods",
1492 "jdk.module.upgrade.path",
1493 "jdk.module.patch.0" };
1494 const char* unsupported_options[] = { "--limit-modules",
1495 "--upgrade-module-path",
1496 "--patch-module"
1497 };
1498 void Arguments::check_unsupported_dumping_properties() {
1499 assert(is_dumping_archive(),
1500 "this function is only used with CDS dump time");
1501 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1502 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1503 SystemProperty* sp = system_properties();
1504 while (sp != NULL) {
1505 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1506 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1507 vm_exit_during_initialization(
1508 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1509 }
1510 }
1511 sp = sp->next();
1512 }
1513
1514 // Check for an exploded module build in use with -Xshare:dump.
1515 if (!has_jimage()) {
1516 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1517 }
1518 }
1519
1520 bool Arguments::check_unsupported_cds_runtime_properties() {
1521 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1522 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1523 if (ArchiveClassesAtExit != NULL) {
1524 // dynamic dumping, just return false for now.
1525 // check_unsupported_dumping_properties() will be called later to check the same set of
1526 // properties, and will exit the VM with the correct error message if the unsupported properties
1527 // are used.
1528 return false;
1529 }
1530 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1531 if (get_property(unsupported_properties[i]) != NULL) {
1532 if (RequireSharedSpaces) {
1533 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1534 }
1535 return true;
1536 }
1537 }
1538 return false;
1539 }
1540 #endif
1541
1542 //===========================================================================================================
1543 // Setting int/mixed/comp mode flags
1544
1545 void Arguments::set_mode_flags(Mode mode) {
1546 // Set up default values for all flags.
1547 // If you add a flag to any of the branches below,
1548 // add a default value for it here.
1549 set_java_compiler(false);
1550 _mode = mode;
1551
1552 // Ensure Agent_OnLoad has the correct initial values.
1553 // This may not be the final mode; mode may change later in onload phase.
1554 PropertyList_unique_add(&_system_properties, "java.vm.info",
1555 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1556
1557 UseInterpreter = true;
1558 UseCompiler = true;
1559 UseLoopCounter = true;
1560
1561 // Default values may be platform/compiler dependent -
1562 // use the saved values
1563 ClipInlining = Arguments::_ClipInlining;
1564 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1565 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1566 BackgroundCompilation = Arguments::_BackgroundCompilation;
1567 if (TieredCompilation) {
1568 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1569 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1570 }
1571 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1572 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1573 }
1574 }
1575
1576 // Change from defaults based on mode
1577 switch (mode) {
1578 default:
1579 ShouldNotReachHere();
1580 break;
1581 case _int:
1582 UseCompiler = false;
1583 UseLoopCounter = false;
1584 AlwaysCompileLoopMethods = false;
1585 UseOnStackReplacement = false;
1586 break;
1587 case _mixed:
1588 // same as default
1589 break;
1590 case _comp:
1591 UseInterpreter = false;
1592 BackgroundCompilation = false;
1593 ClipInlining = false;
1594 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1595 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1596 // compile a level 4 (C2) and then continue executing it.
1597 if (TieredCompilation) {
1598 Tier3InvokeNotifyFreqLog = 0;
1599 Tier4InvocationThreshold = 0;
1600 }
1601 break;
1602 }
1603 }
1604
1605 // Conflict: required to use shared spaces (-Xshare:on), but
1606 // incompatible command line options were chosen.
1607 static void no_shared_spaces(const char* message) {
1608 if (RequireSharedSpaces) {
1609 jio_fprintf(defaultStream::error_stream(),
1610 "Class data sharing is inconsistent with other specified options.\n");
1611 vm_exit_during_initialization("Unable to use shared archive", message);
1612 } else {
1613 log_info(cds)("Unable to use shared archive: %s", message);
1614 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1615 }
1616 }
1617
1618 void set_object_alignment() {
1619 // Object alignment.
1620 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1621 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1622 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1623 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1624 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1625 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1626
1627 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1628 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1629
1630 // Oop encoding heap max
1631 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1632
1633 if (SurvivorAlignmentInBytes == 0) {
1634 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1635 }
1636 }
1637
1638 size_t Arguments::max_heap_for_compressed_oops() {
1639 // Avoid sign flip.
1640 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1641 // We need to fit both the NULL page and the heap into the memory budget, while
1642 // keeping alignment constraints of the heap. To guarantee the latter, as the
1643 // NULL page is located before the heap, we pad the NULL page to the conservative
1644 // maximum alignment that the GC may ever impose upon the heap.
1645 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1646 _conservative_max_heap_alignment);
1647
1648 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1649 NOT_LP64(ShouldNotReachHere(); return 0);
1650 }
1651
1652 void Arguments::set_use_compressed_oops() {
1653 #ifndef ZERO
1654 #ifdef _LP64
1655 // MaxHeapSize is not set up properly at this point, but
1656 // the only value that can override MaxHeapSize if we are
1657 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1658 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1659
1660 if (max_heap_size <= max_heap_for_compressed_oops()) {
1661 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1662 FLAG_SET_ERGO(UseCompressedOops, true);
1663 }
1664 } else {
1665 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1666 warning("Max heap size too large for Compressed Oops");
1667 FLAG_SET_DEFAULT(UseCompressedOops, false);
1668 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1669 }
1670 }
1671 #endif // _LP64
1672 #endif // ZERO
1673 }
1674
1675
1676 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1677 // set_use_compressed_oops().
1678 void Arguments::set_use_compressed_klass_ptrs() {
1679 #ifndef ZERO
1680 #ifdef _LP64
1681 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1682 if (!UseCompressedOops) {
1683 if (UseCompressedClassPointers) {
1684 warning("UseCompressedClassPointers requires UseCompressedOops");
1685 }
1686 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1687 } else {
1688 // Turn on UseCompressedClassPointers too
1689 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1690 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1691 }
1692 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1693 if (UseCompressedClassPointers) {
1694 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1695 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1696 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1697 }
1698 }
1699 }
1700 #endif // _LP64
1701 #endif // !ZERO
1702 }
1703
1704 void Arguments::set_conservative_max_heap_alignment() {
1705 // The conservative maximum required alignment for the heap is the maximum of
1706 // the alignments imposed by several sources: any requirements from the heap
1707 // itself and the maximum page size we may run the VM with.
1708 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1709 _conservative_max_heap_alignment = MAX4(heap_alignment,
1710 (size_t)os::vm_allocation_granularity(),
1711 os::max_page_size(),
1712 GCArguments::compute_heap_alignment());
1713 }
1714
1715 jint Arguments::set_ergonomics_flags() {
1716 GCConfig::initialize();
1717
1718 set_conservative_max_heap_alignment();
1719
1720 #ifndef ZERO
1721 #ifdef _LP64
1722 set_use_compressed_oops();
1723
1724 // set_use_compressed_klass_ptrs() must be called after calling
1725 // set_use_compressed_oops().
1726 set_use_compressed_klass_ptrs();
1727
1728 // Also checks that certain machines are slower with compressed oops
1729 // in vm_version initialization code.
1730 #endif // _LP64
1731 #endif // !ZERO
1732
1733 return JNI_OK;
1734 }
1735
1736 julong Arguments::limit_by_allocatable_memory(julong limit) {
1737 julong max_allocatable;
1738 julong result = limit;
1739 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1740 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1741 }
1742 return result;
1743 }
1744
1745 // Use static initialization to get the default before parsing
1746 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1747
1748 void Arguments::set_heap_size() {
1749 julong phys_mem;
1750
1751 // If the user specified one of these options, they
1752 // want specific memory sizing so do not limit memory
1753 // based on compressed oops addressability.
1754 // Also, memory limits will be calculated based on
1755 // available os physical memory, not our MaxRAM limit,
1756 // unless MaxRAM is also specified.
1757 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1758 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1759 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1760 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1761 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1762 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1763 !FLAG_IS_DEFAULT(MaxRAM));
1764 if (override_coop_limit) {
1765 if (FLAG_IS_DEFAULT(MaxRAM)) {
1766 phys_mem = os::physical_memory();
1767 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1768 } else {
1769 phys_mem = (julong)MaxRAM;
1770 }
1771 } else {
1772 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1773 : (julong)MaxRAM;
1774 }
1775
1776
1777 // Convert deprecated flags
1778 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1779 !FLAG_IS_DEFAULT(MaxRAMFraction))
1780 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1781
1782 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1783 !FLAG_IS_DEFAULT(MinRAMFraction))
1784 MinRAMPercentage = 100.0 / MinRAMFraction;
1785
1786 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1787 !FLAG_IS_DEFAULT(InitialRAMFraction))
1788 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1789
1790 // If the maximum heap size has not been set with -Xmx,
1791 // then set it as fraction of the size of physical memory,
1792 // respecting the maximum and minimum sizes of the heap.
1793 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1794 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1795 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1796 if (reasonable_min < MaxHeapSize) {
1797 // Small physical memory, so use a minimum fraction of it for the heap
1798 reasonable_max = reasonable_min;
1799 } else {
1800 // Not-small physical memory, so require a heap at least
1801 // as large as MaxHeapSize
1802 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1803 }
1804
1805 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1806 // Limit the heap size to ErgoHeapSizeLimit
1807 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1808 }
1809
1810 #ifdef _LP64
1811 if (UseCompressedOops) {
1812 // Limit the heap size to the maximum possible when using compressed oops
1813 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1814
1815 // HeapBaseMinAddress can be greater than default but not less than.
1816 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1817 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1818 // matches compressed oops printing flags
1819 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1820 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1821 DefaultHeapBaseMinAddress,
1822 DefaultHeapBaseMinAddress/G,
1823 HeapBaseMinAddress);
1824 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1825 }
1826 }
1827
1828 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1829 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1830 // but it should be not less than default MaxHeapSize.
1831 max_coop_heap -= HeapBaseMinAddress;
1832 }
1833
1834 // If user specified flags prioritizing os physical
1835 // memory limits, then disable compressed oops if
1836 // limits exceed max_coop_heap and UseCompressedOops
1837 // was not specified.
1838 if (reasonable_max > max_coop_heap) {
1839 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1840 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1841 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1842 "Please check the setting of MaxRAMPercentage %5.2f."
1843 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1844 FLAG_SET_ERGO(UseCompressedOops, false);
1845 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1846 } else {
1847 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1848 }
1849 }
1850 }
1851 #endif // _LP64
1852
1853 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1854
1855 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1856 // An initial heap size was specified on the command line,
1857 // so be sure that the maximum size is consistent. Done
1858 // after call to limit_by_allocatable_memory because that
1859 // method might reduce the allocation size.
1860 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1861 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1862 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1863 }
1864
1865 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1866 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1867 }
1868
1869 // If the minimum or initial heap_size have not been set or requested to be set
1870 // ergonomically, set them accordingly.
1871 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1872 julong reasonable_minimum = (julong)(OldSize + NewSize);
1873
1874 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1875
1876 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1877
1878 if (InitialHeapSize == 0) {
1879 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1880
1881 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1882 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1883
1884 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1885
1886 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1887 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1888 }
1889 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1890 // synchronize with InitialHeapSize to avoid errors with the default value.
1891 if (MinHeapSize == 0) {
1892 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1893 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1894 }
1895 }
1896 }
1897
1898 // This option inspects the machine and attempts to set various
1899 // parameters to be optimal for long-running, memory allocation
1900 // intensive jobs. It is intended for machines with large
1901 // amounts of cpu and memory.
1902 jint Arguments::set_aggressive_heap_flags() {
1903 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1904 // VM, but we may not be able to represent the total physical memory
1905 // available (like having 8gb of memory on a box but using a 32bit VM).
1906 // Thus, we need to make sure we're using a julong for intermediate
1907 // calculations.
1908 julong initHeapSize;
1909 julong total_memory = os::physical_memory();
1910
1911 if (total_memory < (julong) 256 * M) {
1912 jio_fprintf(defaultStream::error_stream(),
1913 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1914 vm_exit(1);
1915 }
1916
1917 // The heap size is half of available memory, or (at most)
1918 // all of possible memory less 160mb (leaving room for the OS
1919 // when using ISM). This is the maximum; because adaptive sizing
1920 // is turned on below, the actual space used may be smaller.
1921
1922 initHeapSize = MIN2(total_memory / (julong) 2,
1923 total_memory - (julong) 160 * M);
1924
1925 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1926
1927 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1928 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1929 return JNI_EINVAL;
1930 }
1931 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1932 return JNI_EINVAL;
1933 }
1934 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1935 return JNI_EINVAL;
1936 }
1937 }
1938 if (FLAG_IS_DEFAULT(NewSize)) {
1939 // Make the young generation 3/8ths of the total heap.
1940 if (FLAG_SET_CMDLINE(NewSize,
1941 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1942 return JNI_EINVAL;
1943 }
1944 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1945 return JNI_EINVAL;
1946 }
1947 }
1948
1949 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1950 FLAG_SET_DEFAULT(UseLargePages, true);
1951 #endif
1952
1953 // Increase some data structure sizes for efficiency
1954 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1955 return JNI_EINVAL;
1956 }
1957 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1958 return JNI_EINVAL;
1959 }
1960 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1961 return JNI_EINVAL;
1962 }
1963
1964 // See the OldPLABSize comment below, but replace 'after promotion'
1965 // with 'after copying'. YoungPLABSize is the size of the survivor
1966 // space per-gc-thread buffers. The default is 4kw.
1967 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1968 return JNI_EINVAL;
1969 }
1970
1971 // OldPLABSize is the size of the buffers in the old gen that
1972 // UseParallelGC uses to promote live data that doesn't fit in the
1973 // survivor spaces. At any given time, there's one for each gc thread.
1974 // The default size is 1kw. These buffers are rarely used, since the
1975 // survivor spaces are usually big enough. For specjbb, however, there
1976 // are occasions when there's lots of live data in the young gen
1977 // and we end up promoting some of it. We don't have a definite
1978 // explanation for why bumping OldPLABSize helps, but the theory
1979 // is that a bigger PLAB results in retaining something like the
1980 // original allocation order after promotion, which improves mutator
1981 // locality. A minor effect may be that larger PLABs reduce the
1982 // number of PLAB allocation events during gc. The value of 8kw
1983 // was arrived at by experimenting with specjbb.
1984 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1985 return JNI_EINVAL;
1986 }
1987
1988 // Enable parallel GC and adaptive generation sizing
1989 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1990 return JNI_EINVAL;
1991 }
1992
1993 // Encourage steady state memory management
1994 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1995 return JNI_EINVAL;
1996 }
1997
1998 // This appears to improve mutator locality
1999 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2000 return JNI_EINVAL;
2001 }
2002
2003 return JNI_OK;
2004 }
2005
2006 // This must be called after ergonomics.
2007 void Arguments::set_bytecode_flags() {
2008 if (!RewriteBytecodes) {
2009 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2010 }
2011 }
2012
2013 // Aggressive optimization flags
2014 jint Arguments::set_aggressive_opts_flags() {
2015 #ifdef COMPILER2
2016 if (AggressiveUnboxing) {
2017 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2018 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2019 } else if (!EliminateAutoBox) {
2020 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2021 AggressiveUnboxing = false;
2022 }
2023 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2024 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2025 } else if (!DoEscapeAnalysis) {
2026 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2027 AggressiveUnboxing = false;
2028 }
2029 }
2030 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2031 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2032 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2033 }
2034 // Feed the cache size setting into the JDK
2035 char buffer[1024];
2036 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2037 if (!add_property(buffer)) {
2038 return JNI_ENOMEM;
2039 }
2040 }
2041 #endif
2042
2043 return JNI_OK;
2044 }
2045
2046 //===========================================================================================================
2047 // Parsing of java.compiler property
2048
2049 void Arguments::process_java_compiler_argument(const char* arg) {
2050 // For backwards compatibility, Djava.compiler=NONE or ""
2051 // causes us to switch to -Xint mode UNLESS -Xdebug
2052 // is also specified.
2053 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2054 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2055 }
2056 }
2057
2058 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2059 _sun_java_launcher = os::strdup_check_oom(launcher);
2060 }
2061
2062 bool Arguments::created_by_java_launcher() {
2063 assert(_sun_java_launcher != NULL, "property must have value");
2064 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2065 }
2066
2067 bool Arguments::sun_java_launcher_is_altjvm() {
2068 return _sun_java_launcher_is_altjvm;
2069 }
2070
2071 //===========================================================================================================
2072 // Parsing of main arguments
2073
2074 unsigned int addreads_count = 0;
2075 unsigned int addexports_count = 0;
2076 unsigned int addopens_count = 0;
2077 unsigned int addmods_count = 0;
2078 unsigned int patch_mod_count = 0;
2079
2080 // Check the consistency of vm_init_args
2081 bool Arguments::check_vm_args_consistency() {
2082 // Method for adding checks for flag consistency.
2083 // The intent is to warn the user of all possible conflicts,
2084 // before returning an error.
2085 // Note: Needs platform-dependent factoring.
2086 bool status = true;
2087
2088 if (TLABRefillWasteFraction == 0) {
2089 jio_fprintf(defaultStream::error_stream(),
2090 "TLABRefillWasteFraction should be a denominator, "
2091 "not " SIZE_FORMAT "\n",
2092 TLABRefillWasteFraction);
2093 status = false;
2094 }
2095
2096 if (PrintNMTStatistics) {
2097 #if INCLUDE_NMT
2098 if (MemTracker::tracking_level() == NMT_off) {
2099 #endif // INCLUDE_NMT
2100 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2101 PrintNMTStatistics = false;
2102 #if INCLUDE_NMT
2103 }
2104 #endif
2105 }
2106
2107 status = CompilerConfig::check_args_consistency(status);
2108 #if INCLUDE_JVMCI
2109 if (status && EnableJVMCI) {
2110 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2111 AddProperty, UnwriteableProperty, InternalProperty);
2112 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2113 return false;
2114 }
2115 }
2116 #endif
2117
2118 #ifndef SUPPORT_RESERVED_STACK_AREA
2119 if (StackReservedPages != 0) {
2120 FLAG_SET_CMDLINE(StackReservedPages, 0);
2121 warning("Reserved Stack Area not supported on this platform");
2122 }
2123 #endif
2124
2125 status = status && GCArguments::check_args_consistency();
2126
2127 return status;
2128 }
2129
2130 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2131 const char* option_type) {
2132 if (ignore) return false;
2133
2134 const char* spacer = " ";
2135 if (option_type == NULL) {
2136 option_type = ++spacer; // Set both to the empty string.
2137 }
2138
2139 jio_fprintf(defaultStream::error_stream(),
2140 "Unrecognized %s%soption: %s\n", option_type, spacer,
2141 option->optionString);
2142 return true;
2143 }
2144
2145 static const char* user_assertion_options[] = {
2146 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2147 };
2148
2149 static const char* system_assertion_options[] = {
2150 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2151 };
2152
2153 bool Arguments::parse_uintx(const char* value,
2154 uintx* uintx_arg,
2155 uintx min_size) {
2156
2157 // Check the sign first since atojulong() parses only unsigned values.
2158 bool value_is_positive = !(*value == '-');
2159
2160 if (value_is_positive) {
2161 julong n;
2162 bool good_return = atojulong(value, &n);
2163 if (good_return) {
2164 bool above_minimum = n >= min_size;
2165 bool value_is_too_large = n > max_uintx;
2166
2167 if (above_minimum && !value_is_too_large) {
2168 *uintx_arg = n;
2169 return true;
2170 }
2171 }
2172 }
2173 return false;
2174 }
2175
2176 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2177 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2178 char* property = AllocateHeap(prop_len, mtArguments);
2179 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2180 if (ret < 0 || ret >= (int)prop_len) {
2181 FreeHeap(property);
2182 return false;
2183 }
2184 bool added = add_property(property, UnwriteableProperty, internal);
2185 FreeHeap(property);
2186 return added;
2187 }
2188
2189 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2190 const unsigned int props_count_limit = 1000;
2191 const int max_digits = 3;
2192 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2193
2194 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2195 if (count < props_count_limit) {
2196 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2197 char* property = AllocateHeap(prop_len, mtArguments);
2198 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2199 if (ret < 0 || ret >= (int)prop_len) {
2200 FreeHeap(property);
2201 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2202 return false;
2203 }
2204 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2205 FreeHeap(property);
2206 return added;
2207 }
2208
2209 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2210 return false;
2211 }
2212
2213 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2214 julong* long_arg,
2215 julong min_size,
2216 julong max_size) {
2217 if (!atojulong(s, long_arg)) return arg_unreadable;
2218 return check_memory_size(*long_arg, min_size, max_size);
2219 }
2220
2221 // Parse JavaVMInitArgs structure
2222
2223 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2224 const JavaVMInitArgs *java_tool_options_args,
2225 const JavaVMInitArgs *java_options_args,
2226 const JavaVMInitArgs *cmd_line_args) {
2227 bool patch_mod_javabase = false;
2228
2229 // Save default settings for some mode flags
2230 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2231 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2232 Arguments::_ClipInlining = ClipInlining;
2233 Arguments::_BackgroundCompilation = BackgroundCompilation;
2234 if (TieredCompilation) {
2235 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2236 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2237 }
2238
2239 // CDS dumping always write the archive to the default value of SharedBaseAddress.
2240 Arguments::_SharedBaseAddress = SharedBaseAddress;
2241
2242 // Setup flags for mixed which is the default
2243 set_mode_flags(_mixed);
2244
2245 // Parse args structure generated from java.base vm options resource
2246 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2247 if (result != JNI_OK) {
2248 return result;
2249 }
2250
2251 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2252 // variable (if present).
2253 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2254 if (result != JNI_OK) {
2255 return result;
2256 }
2257
2258 // Parse args structure generated from the command line flags.
2259 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2260 if (result != JNI_OK) {
2261 return result;
2262 }
2263
2264 // Parse args structure generated from the _JAVA_OPTIONS environment
2265 // variable (if present) (mimics classic VM)
2266 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2267 if (result != JNI_OK) {
2268 return result;
2269 }
2270
2271 // We need to ensure processor and memory resources have been properly
2272 // configured - which may rely on arguments we just processed - before
2273 // doing the final argument processing. Any argument processing that
2274 // needs to know about processor and memory resources must occur after
2275 // this point.
2276
2277 os::init_container_support();
2278
2279 // Do final processing now that all arguments have been parsed
2280 result = finalize_vm_init_args(patch_mod_javabase);
2281 if (result != JNI_OK) {
2282 return result;
2283 }
2284
2285 return JNI_OK;
2286 }
2287
2288 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2289 // represents a valid JDWP agent. is_path==true denotes that we
2290 // are dealing with -agentpath (case where name is a path), otherwise with
2291 // -agentlib
2292 bool valid_jdwp_agent(char *name, bool is_path) {
2293 char *_name;
2294 const char *_jdwp = "jdwp";
2295 size_t _len_jdwp, _len_prefix;
2296
2297 if (is_path) {
2298 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2299 return false;
2300 }
2301
2302 _name++; // skip past last path separator
2303 _len_prefix = strlen(JNI_LIB_PREFIX);
2304
2305 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2306 return false;
2307 }
2308
2309 _name += _len_prefix;
2310 _len_jdwp = strlen(_jdwp);
2311
2312 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2313 _name += _len_jdwp;
2314 }
2315 else {
2316 return false;
2317 }
2318
2319 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2320 return false;
2321 }
2322
2323 return true;
2324 }
2325
2326 if (strcmp(name, _jdwp) == 0) {
2327 return true;
2328 }
2329
2330 return false;
2331 }
2332
2333 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2334 // --patch-module=<module>=<file>(<pathsep><file>)*
2335 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2336 // Find the equal sign between the module name and the path specification
2337 const char* module_equal = strchr(patch_mod_tail, '=');
2338 if (module_equal == NULL) {
2339 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2340 return JNI_ERR;
2341 } else {
2342 // Pick out the module name
2343 size_t module_len = module_equal - patch_mod_tail;
2344 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2345 if (module_name != NULL) {
2346 memcpy(module_name, patch_mod_tail, module_len);
2347 *(module_name + module_len) = '\0';
2348 // The path piece begins one past the module_equal sign
2349 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2350 FREE_C_HEAP_ARRAY(char, module_name);
2351 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2352 return JNI_ENOMEM;
2353 }
2354 } else {
2355 return JNI_ENOMEM;
2356 }
2357 }
2358 return JNI_OK;
2359 }
2360
2361 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2362 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2363 // The min and max sizes match the values in globals.hpp, but scaled
2364 // with K. The values have been chosen so that alignment with page
2365 // size doesn't change the max value, which makes the conversions
2366 // back and forth between Xss value and ThreadStackSize value easier.
2367 // The values have also been chosen to fit inside a 32-bit signed type.
2368 const julong min_ThreadStackSize = 0;
2369 const julong max_ThreadStackSize = 1 * M;
2370
2371 const julong min_size = min_ThreadStackSize * K;
2372 const julong max_size = max_ThreadStackSize * K;
2373
2374 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2375
2376 julong size = 0;
2377 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2378 if (errcode != arg_in_range) {
2379 bool silent = (option == NULL); // Allow testing to silence error messages
2380 if (!silent) {
2381 jio_fprintf(defaultStream::error_stream(),
2382 "Invalid thread stack size: %s\n", option->optionString);
2383 describe_range_error(errcode);
2384 }
2385 return JNI_EINVAL;
2386 }
2387
2388 // Internally track ThreadStackSize in units of 1024 bytes.
2389 const julong size_aligned = align_up(size, K);
2390 assert(size <= size_aligned,
2391 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2392 size, size_aligned);
2393
2394 const julong size_in_K = size_aligned / K;
2395 assert(size_in_K < (julong)max_intx,
2396 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2397 size_in_K);
2398
2399 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2400 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2401 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2402 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2403 max_expanded, size_in_K);
2404
2405 *out_ThreadStackSize = (intx)size_in_K;
2406
2407 return JNI_OK;
2408 }
2409
2410 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2411 // For match_option to return remaining or value part of option string
2412 const char* tail;
2413
2414 // iterate over arguments
2415 for (int index = 0; index < args->nOptions; index++) {
2416 bool is_absolute_path = false; // for -agentpath vs -agentlib
2417
2418 const JavaVMOption* option = args->options + index;
2419
2420 if (!match_option(option, "-Djava.class.path", &tail) &&
2421 !match_option(option, "-Dsun.java.command", &tail) &&
2422 !match_option(option, "-Dsun.java.launcher", &tail)) {
2423
2424 // add all jvm options to the jvm_args string. This string
2425 // is used later to set the java.vm.args PerfData string constant.
2426 // the -Djava.class.path and the -Dsun.java.command options are
2427 // omitted from jvm_args string as each have their own PerfData
2428 // string constant object.
2429 build_jvm_args(option->optionString);
2430 }
2431
2432 // -verbose:[class/module/gc/jni]
2433 if (match_option(option, "-verbose", &tail)) {
2434 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2435 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2436 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2437 } else if (!strcmp(tail, ":module")) {
2438 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2439 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2440 } else if (!strcmp(tail, ":gc")) {
2441 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2442 } else if (!strcmp(tail, ":jni")) {
2443 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2444 }
2445 // -da / -ea / -disableassertions / -enableassertions
2446 // These accept an optional class/package name separated by a colon, e.g.,
2447 // -da:java.lang.Thread.
2448 } else if (match_option(option, user_assertion_options, &tail, true)) {
2449 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2450 if (*tail == '\0') {
2451 JavaAssertions::setUserClassDefault(enable);
2452 } else {
2453 assert(*tail == ':', "bogus match by match_option()");
2454 JavaAssertions::addOption(tail + 1, enable);
2455 }
2456 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2457 } else if (match_option(option, system_assertion_options, &tail, false)) {
2458 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2459 JavaAssertions::setSystemClassDefault(enable);
2460 // -bootclasspath:
2461 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2462 jio_fprintf(defaultStream::output_stream(),
2463 "-Xbootclasspath is no longer a supported option.\n");
2464 return JNI_EINVAL;
2465 // -bootclasspath/a:
2466 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2467 Arguments::append_sysclasspath(tail);
2468 // -bootclasspath/p:
2469 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2470 jio_fprintf(defaultStream::output_stream(),
2471 "-Xbootclasspath/p is no longer a supported option.\n");
2472 return JNI_EINVAL;
2473 // -Xrun
2474 } else if (match_option(option, "-Xrun", &tail)) {
2475 if (tail != NULL) {
2476 const char* pos = strchr(tail, ':');
2477 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2478 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2479 jio_snprintf(name, len + 1, "%s", tail);
2480
2481 char *options = NULL;
2482 if(pos != NULL) {
2483 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2484 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2485 }
2486 #if !INCLUDE_JVMTI
2487 if (strcmp(name, "jdwp") == 0) {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Debugging agents are not supported in this VM\n");
2490 return JNI_ERR;
2491 }
2492 #endif // !INCLUDE_JVMTI
2493 add_init_library(name, options);
2494 }
2495 } else if (match_option(option, "--add-reads=", &tail)) {
2496 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2497 return JNI_ENOMEM;
2498 }
2499 } else if (match_option(option, "--add-exports=", &tail)) {
2500 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2501 return JNI_ENOMEM;
2502 }
2503 } else if (match_option(option, "--add-opens=", &tail)) {
2504 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2505 return JNI_ENOMEM;
2506 }
2507 } else if (match_option(option, "--add-modules=", &tail)) {
2508 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2509 return JNI_ENOMEM;
2510 }
2511 } else if (match_option(option, "--limit-modules=", &tail)) {
2512 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2513 return JNI_ENOMEM;
2514 }
2515 } else if (match_option(option, "--module-path=", &tail)) {
2516 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2517 return JNI_ENOMEM;
2518 }
2519 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2520 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2521 return JNI_ENOMEM;
2522 }
2523 } else if (match_option(option, "--patch-module=", &tail)) {
2524 // --patch-module=<module>=<file>(<pathsep><file>)*
2525 int res = process_patch_mod_option(tail, patch_mod_javabase);
2526 if (res != JNI_OK) {
2527 return res;
2528 }
2529 } else if (match_option(option, "--illegal-access=", &tail)) {
2530 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2531 return JNI_ENOMEM;
2532 }
2533 // -agentlib and -agentpath
2534 } else if (match_option(option, "-agentlib:", &tail) ||
2535 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2536 if(tail != NULL) {
2537 const char* pos = strchr(tail, '=');
2538 char* name;
2539 if (pos == NULL) {
2540 name = os::strdup_check_oom(tail, mtArguments);
2541 } else {
2542 size_t len = pos - tail;
2543 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2544 memcpy(name, tail, len);
2545 name[len] = '\0';
2546 }
2547
2548 char *options = NULL;
2549 if(pos != NULL) {
2550 options = os::strdup_check_oom(pos + 1, mtArguments);
2551 }
2552 #if !INCLUDE_JVMTI
2553 if (valid_jdwp_agent(name, is_absolute_path)) {
2554 jio_fprintf(defaultStream::error_stream(),
2555 "Debugging agents are not supported in this VM\n");
2556 return JNI_ERR;
2557 }
2558 #endif // !INCLUDE_JVMTI
2559 add_init_agent(name, options, is_absolute_path);
2560 }
2561 // -javaagent
2562 } else if (match_option(option, "-javaagent:", &tail)) {
2563 #if !INCLUDE_JVMTI
2564 jio_fprintf(defaultStream::error_stream(),
2565 "Instrumentation agents are not supported in this VM\n");
2566 return JNI_ERR;
2567 #else
2568 if (tail != NULL) {
2569 size_t length = strlen(tail) + 1;
2570 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2571 jio_snprintf(options, length, "%s", tail);
2572 add_instrument_agent("instrument", options, false);
2573 // java agents need module java.instrument
2574 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2575 return JNI_ENOMEM;
2576 }
2577 }
2578 #endif // !INCLUDE_JVMTI
2579 // --enable_preview
2580 } else if (match_option(option, "--enable-preview")) {
2581 set_enable_preview();
2582 // -Xnoclassgc
2583 } else if (match_option(option, "-Xnoclassgc")) {
2584 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2585 return JNI_EINVAL;
2586 }
2587 // -Xbatch
2588 } else if (match_option(option, "-Xbatch")) {
2589 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2590 return JNI_EINVAL;
2591 }
2592 // -Xmn for compatibility with other JVM vendors
2593 } else if (match_option(option, "-Xmn", &tail)) {
2594 julong long_initial_young_size = 0;
2595 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2596 if (errcode != arg_in_range) {
2597 jio_fprintf(defaultStream::error_stream(),
2598 "Invalid initial young generation size: %s\n", option->optionString);
2599 describe_range_error(errcode);
2600 return JNI_EINVAL;
2601 }
2602 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2606 return JNI_EINVAL;
2607 }
2608 // -Xms
2609 } else if (match_option(option, "-Xms", &tail)) {
2610 julong size = 0;
2611 // an initial heap size of 0 means automatically determine
2612 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2613 if (errcode != arg_in_range) {
2614 jio_fprintf(defaultStream::error_stream(),
2615 "Invalid initial heap size: %s\n", option->optionString);
2616 describe_range_error(errcode);
2617 return JNI_EINVAL;
2618 }
2619 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2620 return JNI_EINVAL;
2621 }
2622 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2623 return JNI_EINVAL;
2624 }
2625 // -Xmx
2626 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2627 julong long_max_heap_size = 0;
2628 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2629 if (errcode != arg_in_range) {
2630 jio_fprintf(defaultStream::error_stream(),
2631 "Invalid maximum heap size: %s\n", option->optionString);
2632 describe_range_error(errcode);
2633 return JNI_EINVAL;
2634 }
2635 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2636 return JNI_EINVAL;
2637 }
2638 // Xmaxf
2639 } else if (match_option(option, "-Xmaxf", &tail)) {
2640 char* err;
2641 int maxf = (int)(strtod(tail, &err) * 100);
2642 if (*err != '\0' || *tail == '\0') {
2643 jio_fprintf(defaultStream::error_stream(),
2644 "Bad max heap free percentage size: %s\n",
2645 option->optionString);
2646 return JNI_EINVAL;
2647 } else {
2648 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2649 return JNI_EINVAL;
2650 }
2651 }
2652 // Xminf
2653 } else if (match_option(option, "-Xminf", &tail)) {
2654 char* err;
2655 int minf = (int)(strtod(tail, &err) * 100);
2656 if (*err != '\0' || *tail == '\0') {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Bad min heap free percentage size: %s\n",
2659 option->optionString);
2660 return JNI_EINVAL;
2661 } else {
2662 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 }
2666 // -Xss
2667 } else if (match_option(option, "-Xss", &tail)) {
2668 intx value = 0;
2669 jint err = parse_xss(option, tail, &value);
2670 if (err != JNI_OK) {
2671 return err;
2672 }
2673 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2677 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2678 julong long_ReservedCodeCacheSize = 0;
2679
2680 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2681 if (errcode != arg_in_range) {
2682 jio_fprintf(defaultStream::error_stream(),
2683 "Invalid maximum code cache size: %s.\n", option->optionString);
2684 return JNI_EINVAL;
2685 }
2686 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 // -green
2690 } else if (match_option(option, "-green")) {
2691 jio_fprintf(defaultStream::error_stream(),
2692 "Green threads support not available\n");
2693 return JNI_EINVAL;
2694 // -native
2695 } else if (match_option(option, "-native")) {
2696 // HotSpot always uses native threads, ignore silently for compatibility
2697 // -Xrs
2698 } else if (match_option(option, "-Xrs")) {
2699 // Classic/EVM option, new functionality
2700 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703 // -Xprof
2704 } else if (match_option(option, "-Xprof")) {
2705 char version[256];
2706 // Obsolete in JDK 10
2707 JDK_Version::jdk(10).to_string(version, sizeof(version));
2708 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2709 // -Xinternalversion
2710 } else if (match_option(option, "-Xinternalversion")) {
2711 jio_fprintf(defaultStream::output_stream(), "%s\n",
2712 VM_Version::internal_vm_info_string());
2713 vm_exit(0);
2714 #ifndef PRODUCT
2715 // -Xprintflags
2716 } else if (match_option(option, "-Xprintflags")) {
2717 JVMFlag::printFlags(tty, false);
2718 vm_exit(0);
2719 #endif
2720 // -D
2721 } else if (match_option(option, "-D", &tail)) {
2722 const char* value;
2723 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2724 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2725 // abort if -Djava.endorsed.dirs is set
2726 jio_fprintf(defaultStream::output_stream(),
2727 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2728 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2729 return JNI_EINVAL;
2730 }
2731 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2732 *value != '\0' && strcmp(value, "\"\"") != 0) {
2733 // abort if -Djava.ext.dirs is set
2734 jio_fprintf(defaultStream::output_stream(),
2735 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2736 return JNI_EINVAL;
2737 }
2738 // Check for module related properties. They must be set using the modules
2739 // options. For example: use "--add-modules=java.sql", not
2740 // "-Djdk.module.addmods=java.sql"
2741 if (is_internal_module_property(option->optionString + 2)) {
2742 needs_module_property_warning = true;
2743 continue;
2744 }
2745 if (!add_property(tail)) {
2746 return JNI_ENOMEM;
2747 }
2748 // Out of the box management support
2749 if (match_option(option, "-Dcom.sun.management", &tail)) {
2750 #if INCLUDE_MANAGEMENT
2751 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 // management agent in module jdk.management.agent
2755 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2756 return JNI_ENOMEM;
2757 }
2758 #else
2759 jio_fprintf(defaultStream::output_stream(),
2760 "-Dcom.sun.management is not supported in this VM.\n");
2761 return JNI_ERR;
2762 #endif
2763 }
2764 // -Xint
2765 } else if (match_option(option, "-Xint")) {
2766 set_mode_flags(_int);
2767 // -Xmixed
2768 } else if (match_option(option, "-Xmixed")) {
2769 set_mode_flags(_mixed);
2770 // -Xcomp
2771 } else if (match_option(option, "-Xcomp")) {
2772 // for testing the compiler; turn off all flags that inhibit compilation
2773 set_mode_flags(_comp);
2774 // -Xshare:dump
2775 } else if (match_option(option, "-Xshare:dump")) {
2776 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 // -Xshare:on
2780 } else if (match_option(option, "-Xshare:on")) {
2781 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2782 return JNI_EINVAL;
2783 }
2784 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2785 return JNI_EINVAL;
2786 }
2787 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2788 } else if (match_option(option, "-Xshare:auto")) {
2789 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2790 return JNI_EINVAL;
2791 }
2792 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2793 return JNI_EINVAL;
2794 }
2795 // -Xshare:off
2796 } else if (match_option(option, "-Xshare:off")) {
2797 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 // -Xverify
2804 } else if (match_option(option, "-Xverify", &tail)) {
2805 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2806 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2807 return JNI_EINVAL;
2808 }
2809 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 } else if (strcmp(tail, ":remote") == 0) {
2813 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2814 return JNI_EINVAL;
2815 }
2816 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2817 return JNI_EINVAL;
2818 }
2819 } else if (strcmp(tail, ":none") == 0) {
2820 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2824 return JNI_EINVAL;
2825 }
2826 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2827 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2828 return JNI_EINVAL;
2829 }
2830 // -Xdebug
2831 } else if (match_option(option, "-Xdebug")) {
2832 // note this flag has been used, then ignore
2833 set_xdebug_mode(true);
2834 // -Xnoagent
2835 } else if (match_option(option, "-Xnoagent")) {
2836 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2837 } else if (match_option(option, "-Xloggc:", &tail)) {
2838 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2839 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2840 _gc_log_filename = os::strdup_check_oom(tail);
2841 } else if (match_option(option, "-Xlog", &tail)) {
2842 bool ret = false;
2843 if (strcmp(tail, ":help") == 0) {
2844 fileStream stream(defaultStream::output_stream());
2845 LogConfiguration::print_command_line_help(&stream);
2846 vm_exit(0);
2847 } else if (strcmp(tail, ":disable") == 0) {
2848 LogConfiguration::disable_logging();
2849 ret = true;
2850 } else if (*tail == '\0') {
2851 ret = LogConfiguration::parse_command_line_arguments();
2852 assert(ret, "-Xlog without arguments should never fail to parse");
2853 } else if (*tail == ':') {
2854 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2855 }
2856 if (ret == false) {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2859 tail);
2860 return JNI_EINVAL;
2861 }
2862 // JNI hooks
2863 } else if (match_option(option, "-Xcheck", &tail)) {
2864 if (!strcmp(tail, ":jni")) {
2865 #if !INCLUDE_JNI_CHECK
2866 warning("JNI CHECKING is not supported in this VM");
2867 #else
2868 CheckJNICalls = true;
2869 #endif // INCLUDE_JNI_CHECK
2870 } else if (is_bad_option(option, args->ignoreUnrecognized,
2871 "check")) {
2872 return JNI_EINVAL;
2873 }
2874 } else if (match_option(option, "vfprintf")) {
2875 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2876 } else if (match_option(option, "exit")) {
2877 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2878 } else if (match_option(option, "abort")) {
2879 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2880 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2881 // and the last option wins.
2882 } else if (match_option(option, "-XX:+NeverTenure")) {
2883 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2884 return JNI_EINVAL;
2885 }
2886 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2887 return JNI_EINVAL;
2888 }
2889 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2893 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2903 uintx max_tenuring_thresh = 0;
2904 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2905 jio_fprintf(defaultStream::error_stream(),
2906 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2907 return JNI_EINVAL;
2908 }
2909
2910 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913
2914 if (MaxTenuringThreshold == 0) {
2915 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2916 return JNI_EINVAL;
2917 }
2918 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 } else {
2922 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 }
2929 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2930 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2931 return JNI_EINVAL;
2932 }
2933 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2937 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2944 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2945 return JNI_EINVAL;
2946 }
2947 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2951 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2958 #if defined(DTRACE_ENABLED)
2959 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2966 return JNI_EINVAL;
2967 }
2968 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2969 return JNI_EINVAL;
2970 }
2971 #else // defined(DTRACE_ENABLED)
2972 jio_fprintf(defaultStream::error_stream(),
2973 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2974 return JNI_EINVAL;
2975 #endif // defined(DTRACE_ENABLED)
2976 #ifdef ASSERT
2977 } else if (match_option(option, "-XX:+FullGCALot")) {
2978 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981 // disable scavenge before parallel mark-compact
2982 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2983 return JNI_EINVAL;
2984 }
2985 #endif
2986 #if !INCLUDE_MANAGEMENT
2987 } else if (match_option(option, "-XX:+ManagementServer")) {
2988 jio_fprintf(defaultStream::error_stream(),
2989 "ManagementServer is not supported in this VM.\n");
2990 return JNI_ERR;
2991 #endif // INCLUDE_MANAGEMENT
2992 #if INCLUDE_JVMCI
2993 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2994 if (EnableJVMCIProduct) {
2995 jio_fprintf(defaultStream::error_stream(),
2996 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2997 return JNI_EINVAL;
2998 }
2999 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
3000 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
3001 // Allow this flag if it has been unlocked.
3002 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
3003 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
3004 jio_fprintf(defaultStream::error_stream(),
3005 "Unable to enable JVMCI in product mode");
3006 return JNI_ERR;
3007 }
3008 }
3009 // The flag was locked so process normally to report that error
3010 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3011 return JNI_EINVAL;
3012 }
3013 #endif // INCLUDE_JVMCI
3014 #if INCLUDE_JFR
3015 } else if (match_jfr_option(&option)) {
3016 return JNI_EINVAL;
3017 #endif
3018 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3019 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3020 // already been handled
3021 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3022 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3023 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3024 return JNI_EINVAL;
3025 }
3026 }
3027 // Unknown option
3028 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3029 return JNI_ERR;
3030 }
3031 }
3032
3033 // PrintSharedArchiveAndExit will turn on
3034 // -Xshare:on
3035 // -Xlog:class+path=info
3036 if (PrintSharedArchiveAndExit) {
3037 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3038 return JNI_EINVAL;
3039 }
3040 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3041 return JNI_EINVAL;
3042 }
3043 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3044 }
3045
3046 fix_appclasspath();
3047
3048 return JNI_OK;
3049 }
3050
3051 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3052 // For java.base check for duplicate --patch-module options being specified on the command line.
3053 // This check is only required for java.base, all other duplicate module specifications
3054 // will be checked during module system initialization. The module system initialization
3055 // will throw an ExceptionInInitializerError if this situation occurs.
3056 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3057 if (*patch_mod_javabase) {
3058 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3059 } else {
3060 *patch_mod_javabase = true;
3061 }
3062 }
3063
3064 // Create GrowableArray lazily, only if --patch-module has been specified
3065 if (_patch_mod_prefix == NULL) {
3066 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3067 }
3068
3069 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3070 }
3071
3072 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3073 //
3074 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3075 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3076 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3077 // path is treated as the current directory.
3078 //
3079 // This causes problems with CDS, which requires that all directories specified in the classpath
3080 // must be empty. In most cases, applications do NOT want to load classes from the current
3081 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3082 // scripts compatible with CDS.
3083 void Arguments::fix_appclasspath() {
3084 if (IgnoreEmptyClassPaths) {
3085 const char separator = *os::path_separator();
3086 const char* src = _java_class_path->value();
3087
3088 // skip over all the leading empty paths
3089 while (*src == separator) {
3090 src ++;
3091 }
3092
3093 char* copy = os::strdup_check_oom(src, mtArguments);
3094
3095 // trim all trailing empty paths
3096 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3097 *tail = '\0';
3098 }
3099
3100 char from[3] = {separator, separator, '\0'};
3101 char to [2] = {separator, '\0'};
3102 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3103 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3104 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3105 }
3106
3107 _java_class_path->set_writeable_value(copy);
3108 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3109 }
3110 }
3111
3112 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3113 // check if the default lib/endorsed directory exists; if so, error
3114 char path[JVM_MAXPATHLEN];
3115 const char* fileSep = os::file_separator();
3116 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3117
3118 DIR* dir = os::opendir(path);
3119 if (dir != NULL) {
3120 jio_fprintf(defaultStream::output_stream(),
3121 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3122 "in modular form will be supported via the concept of upgradeable modules.\n");
3123 os::closedir(dir);
3124 return JNI_ERR;
3125 }
3126
3127 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3128 dir = os::opendir(path);
3129 if (dir != NULL) {
3130 jio_fprintf(defaultStream::output_stream(),
3131 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3132 "Use -classpath instead.\n.");
3133 os::closedir(dir);
3134 return JNI_ERR;
3135 }
3136
3137 // This must be done after all arguments have been processed
3138 // and the container support has been initialized since AggressiveHeap
3139 // relies on the amount of total memory available.
3140 if (AggressiveHeap) {
3141 jint result = set_aggressive_heap_flags();
3142 if (result != JNI_OK) {
3143 return result;
3144 }
3145 }
3146
3147 // This must be done after all arguments have been processed.
3148 // java_compiler() true means set to "NONE" or empty.
3149 if (java_compiler() && !xdebug_mode()) {
3150 // For backwards compatibility, we switch to interpreted mode if
3151 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3152 // not specified.
3153 set_mode_flags(_int);
3154 }
3155
3156 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3157 // but like -Xint, leave compilation thresholds unaffected.
3158 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3159 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3160 set_mode_flags(_int);
3161 }
3162
3163 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3164 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3165 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3166 }
3167
3168 #if !COMPILER2_OR_JVMCI
3169 // Don't degrade server performance for footprint
3170 if (FLAG_IS_DEFAULT(UseLargePages) &&
3171 MaxHeapSize < LargePageHeapSizeThreshold) {
3172 // No need for large granularity pages w/small heaps.
3173 // Note that large pages are enabled/disabled for both the
3174 // Java heap and the code cache.
3175 FLAG_SET_DEFAULT(UseLargePages, false);
3176 }
3177
3178 UNSUPPORTED_OPTION(ProfileInterpreter);
3179 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3180 #endif
3181
3182
3183 #ifdef TIERED
3184 // Parse the CompilationMode flag
3185 if (!CompilationModeFlag::initialize()) {
3186 return JNI_ERR;
3187 }
3188 #else
3189 // Tiered compilation is undefined.
3190 UNSUPPORTED_OPTION(TieredCompilation);
3191 #endif
3192
3193 if (!check_vm_args_consistency()) {
3194 return JNI_ERR;
3195 }
3196
3197 #if INCLUDE_CDS
3198 if (DumpSharedSpaces) {
3199 // Disable biased locking now as it interferes with the clean up of
3200 // the archived Klasses and Java string objects (at dump time only).
3201 UseBiasedLocking = false;
3202
3203 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3204 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3205 // compiler just to be safe.
3206 //
3207 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3208 // instead of modifying them in place. The copy is inaccessible to the compiler.
3209 // TODO: revisit the following for the static archive case.
3210 set_mode_flags(_int);
3211 }
3212 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3213 // Always verify non-system classes during CDS dump
3214 if (!BytecodeVerificationRemote) {
3215 BytecodeVerificationRemote = true;
3216 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3217 }
3218 }
3219 if (ArchiveClassesAtExit == NULL) {
3220 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3221 }
3222 if (UseSharedSpaces && patch_mod_javabase) {
3223 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3224 }
3225 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3226 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3227 }
3228 #endif
3229
3230 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3231 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3232 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3233
3234 return JNI_OK;
3235 }
3236
3237 // Helper class for controlling the lifetime of JavaVMInitArgs
3238 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3239 // deleted on the destruction of the ScopedVMInitArgs object.
3240 class ScopedVMInitArgs : public StackObj {
3241 private:
3242 JavaVMInitArgs _args;
3243 char* _container_name;
3244 bool _is_set;
3245 char* _vm_options_file_arg;
3246
3247 public:
3248 ScopedVMInitArgs(const char *container_name) {
3249 _args.version = JNI_VERSION_1_2;
3250 _args.nOptions = 0;
3251 _args.options = NULL;
3252 _args.ignoreUnrecognized = false;
3253 _container_name = (char *)container_name;
3254 _is_set = false;
3255 _vm_options_file_arg = NULL;
3256 }
3257
3258 // Populates the JavaVMInitArgs object represented by this
3259 // ScopedVMInitArgs object with the arguments in options. The
3260 // allocated memory is deleted by the destructor. If this method
3261 // returns anything other than JNI_OK, then this object is in a
3262 // partially constructed state, and should be abandoned.
3263 jint set_args(GrowableArray<JavaVMOption>* options) {
3264 _is_set = true;
3265 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3266 JavaVMOption, options->length(), mtArguments);
3267 if (options_arr == NULL) {
3268 return JNI_ENOMEM;
3269 }
3270 _args.options = options_arr;
3271
3272 for (int i = 0; i < options->length(); i++) {
3273 options_arr[i] = options->at(i);
3274 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3275 if (options_arr[i].optionString == NULL) {
3276 // Rely on the destructor to do cleanup.
3277 _args.nOptions = i;
3278 return JNI_ENOMEM;
3279 }
3280 }
3281
3282 _args.nOptions = options->length();
3283 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3284 return JNI_OK;
3285 }
3286
3287 JavaVMInitArgs* get() { return &_args; }
3288 char* container_name() { return _container_name; }
3289 bool is_set() { return _is_set; }
3290 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3291 char* vm_options_file_arg() { return _vm_options_file_arg; }
3292
3293 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3294 if (_vm_options_file_arg != NULL) {
3295 os::free(_vm_options_file_arg);
3296 }
3297 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3298 }
3299
3300 ~ScopedVMInitArgs() {
3301 if (_vm_options_file_arg != NULL) {
3302 os::free(_vm_options_file_arg);
3303 }
3304 if (_args.options == NULL) return;
3305 for (int i = 0; i < _args.nOptions; i++) {
3306 os::free(_args.options[i].optionString);
3307 }
3308 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3309 }
3310
3311 // Insert options into this option list, to replace option at
3312 // vm_options_file_pos (-XX:VMOptionsFile)
3313 jint insert(const JavaVMInitArgs* args,
3314 const JavaVMInitArgs* args_to_insert,
3315 const int vm_options_file_pos) {
3316 assert(_args.options == NULL, "shouldn't be set yet");
3317 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3318 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3319
3320 int length = args->nOptions + args_to_insert->nOptions - 1;
3321 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3322 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3323 for (int i = 0; i < args->nOptions; i++) {
3324 if (i == vm_options_file_pos) {
3325 // insert the new options starting at the same place as the
3326 // -XX:VMOptionsFile option
3327 for (int j = 0; j < args_to_insert->nOptions; j++) {
3328 options->push(args_to_insert->options[j]);
3329 }
3330 } else {
3331 options->push(args->options[i]);
3332 }
3333 }
3334 // make into options array
3335 jint result = set_args(options);
3336 delete options;
3337 return result;
3338 }
3339 };
3340
3341 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3342 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3343 }
3344
3345 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3346 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3347 }
3348
3349 jint Arguments::parse_options_environment_variable(const char* name,
3350 ScopedVMInitArgs* vm_args) {
3351 char *buffer = ::getenv(name);
3352
3353 // Don't check this environment variable if user has special privileges
3354 // (e.g. unix su command).
3355 if (buffer == NULL || os::have_special_privileges()) {
3356 return JNI_OK;
3357 }
3358
3359 if ((buffer = os::strdup(buffer)) == NULL) {
3360 return JNI_ENOMEM;
3361 }
3362
3363 jio_fprintf(defaultStream::error_stream(),
3364 "Picked up %s: %s\n", name, buffer);
3365
3366 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3367
3368 os::free(buffer);
3369 return retcode;
3370 }
3371
3372 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3373 // read file into buffer
3374 int fd = ::open(file_name, O_RDONLY);
3375 if (fd < 0) {
3376 jio_fprintf(defaultStream::error_stream(),
3377 "Could not open options file '%s'\n",
3378 file_name);
3379 return JNI_ERR;
3380 }
3381
3382 struct stat stbuf;
3383 int retcode = os::stat(file_name, &stbuf);
3384 if (retcode != 0) {
3385 jio_fprintf(defaultStream::error_stream(),
3386 "Could not stat options file '%s'\n",
3387 file_name);
3388 os::close(fd);
3389 return JNI_ERR;
3390 }
3391
3392 if (stbuf.st_size == 0) {
3393 // tell caller there is no option data and that is ok
3394 os::close(fd);
3395 return JNI_OK;
3396 }
3397
3398 // '+ 1' for NULL termination even with max bytes
3399 size_t bytes_alloc = stbuf.st_size + 1;
3400
3401 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3402 if (NULL == buf) {
3403 jio_fprintf(defaultStream::error_stream(),
3404 "Could not allocate read buffer for options file parse\n");
3405 os::close(fd);
3406 return JNI_ENOMEM;
3407 }
3408
3409 memset(buf, 0, bytes_alloc);
3410
3411 // Fill buffer
3412 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3413 os::close(fd);
3414 if (bytes_read < 0) {
3415 FREE_C_HEAP_ARRAY(char, buf);
3416 jio_fprintf(defaultStream::error_stream(),
3417 "Could not read options file '%s'\n", file_name);
3418 return JNI_ERR;
3419 }
3420
3421 if (bytes_read == 0) {
3422 // tell caller there is no option data and that is ok
3423 FREE_C_HEAP_ARRAY(char, buf);
3424 return JNI_OK;
3425 }
3426
3427 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3428
3429 FREE_C_HEAP_ARRAY(char, buf);
3430 return retcode;
3431 }
3432
3433 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3434 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3435
3436 // some pointers to help with parsing
3437 char *buffer_end = buffer + buf_len;
3438 char *opt_hd = buffer;
3439 char *wrt = buffer;
3440 char *rd = buffer;
3441
3442 // parse all options
3443 while (rd < buffer_end) {
3444 // skip leading white space from the input string
3445 while (rd < buffer_end && isspace(*rd)) {
3446 rd++;
3447 }
3448
3449 if (rd >= buffer_end) {
3450 break;
3451 }
3452
3453 // Remember this is where we found the head of the token.
3454 opt_hd = wrt;
3455
3456 // Tokens are strings of non white space characters separated
3457 // by one or more white spaces.
3458 while (rd < buffer_end && !isspace(*rd)) {
3459 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3460 int quote = *rd; // matching quote to look for
3461 rd++; // don't copy open quote
3462 while (rd < buffer_end && *rd != quote) {
3463 // include everything (even spaces)
3464 // up until the close quote
3465 *wrt++ = *rd++; // copy to option string
3466 }
3467
3468 if (rd < buffer_end) {
3469 rd++; // don't copy close quote
3470 } else {
3471 // did not see closing quote
3472 jio_fprintf(defaultStream::error_stream(),
3473 "Unmatched quote in %s\n", name);
3474 delete options;
3475 return JNI_ERR;
3476 }
3477 } else {
3478 *wrt++ = *rd++; // copy to option string
3479 }
3480 }
3481
3482 // steal a white space character and set it to NULL
3483 *wrt++ = '\0';
3484 // We now have a complete token
3485
3486 JavaVMOption option;
3487 option.optionString = opt_hd;
3488 option.extraInfo = NULL;
3489
3490 options->append(option); // Fill in option
3491
3492 rd++; // Advance to next character
3493 }
3494
3495 // Fill out JavaVMInitArgs structure.
3496 jint status = vm_args->set_args(options);
3497
3498 delete options;
3499 return status;
3500 }
3501
3502 void Arguments::set_shared_spaces_flags() {
3503 if (DumpSharedSpaces) {
3504 if (RequireSharedSpaces) {
3505 warning("Cannot dump shared archive while using shared archive");
3506 }
3507 UseSharedSpaces = false;
3508 }
3509 }
3510
3511 #if INCLUDE_CDS
3512 // Sharing support
3513 // Construct the path to the archive
3514 char* Arguments::get_default_shared_archive_path() {
3515 char *default_archive_path;
3516 char jvm_path[JVM_MAXPATHLEN];
3517 os::jvm_path(jvm_path, sizeof(jvm_path));
3518 char *end = strrchr(jvm_path, *os::file_separator());
3519 if (end != NULL) *end = '\0';
3520 size_t jvm_path_len = strlen(jvm_path);
3521 size_t file_sep_len = strlen(os::file_separator());
3522 const size_t len = jvm_path_len + file_sep_len + 20;
3523 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3524 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3525 jvm_path, os::file_separator());
3526 return default_archive_path;
3527 }
3528
3529 int Arguments::num_archives(const char* archive_path) {
3530 if (archive_path == NULL) {
3531 return 0;
3532 }
3533 int npaths = 1;
3534 char* p = (char*)archive_path;
3535 while (*p != '\0') {
3536 if (*p == os::path_separator()[0]) {
3537 npaths++;
3538 }
3539 p++;
3540 }
3541 return npaths;
3542 }
3543
3544 void Arguments::extract_shared_archive_paths(const char* archive_path,
3545 char** base_archive_path,
3546 char** top_archive_path) {
3547 char* begin_ptr = (char*)archive_path;
3548 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3549 if (end_ptr == NULL || end_ptr == begin_ptr) {
3550 vm_exit_during_initialization("Base archive was not specified", archive_path);
3551 }
3552 size_t len = end_ptr - begin_ptr;
3553 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3554 strncpy(cur_path, begin_ptr, len);
3555 cur_path[len] = '\0';
3556 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3557 *base_archive_path = cur_path;
3558
3559 begin_ptr = ++end_ptr;
3560 if (*begin_ptr == '\0') {
3561 vm_exit_during_initialization("Top archive was not specified", archive_path);
3562 }
3563 end_ptr = strchr(begin_ptr, '\0');
3564 assert(end_ptr != NULL, "sanity");
3565 len = end_ptr - begin_ptr;
3566 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3567 strncpy(cur_path, begin_ptr, len + 1);
3568 //cur_path[len] = '\0';
3569 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3570 *top_archive_path = cur_path;
3571 }
3572
3573 bool Arguments::init_shared_archive_paths() {
3574 if (ArchiveClassesAtExit != NULL) {
3575 if (DumpSharedSpaces) {
3576 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3577 }
3578 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3579 return false;
3580 }
3581 check_unsupported_dumping_properties();
3582 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3583 }
3584 if (SharedArchiveFile == NULL) {
3585 SharedArchivePath = get_default_shared_archive_path();
3586 } else {
3587 int archives = num_archives(SharedArchiveFile);
3588 if (is_dumping_archive()) {
3589 if (archives > 1) {
3590 vm_exit_during_initialization(
3591 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3592 }
3593 if (DynamicDumpSharedSpaces) {
3594 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3595 vm_exit_during_initialization(
3596 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3597 SharedArchiveFile);
3598 }
3599 }
3600 }
3601 if (!is_dumping_archive()){
3602 if (archives > 2) {
3603 vm_exit_during_initialization(
3604 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3605 }
3606 if (archives == 1) {
3607 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3608 int name_size;
3609 bool success =
3610 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3611 if (!success) {
3612 SharedArchivePath = temp_archive_path;
3613 } else {
3614 SharedDynamicArchivePath = temp_archive_path;
3615 }
3616 } else {
3617 extract_shared_archive_paths((const char*)SharedArchiveFile,
3618 &SharedArchivePath, &SharedDynamicArchivePath);
3619 }
3620 } else { // CDS dumping
3621 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3622 }
3623 }
3624 return (SharedArchivePath != NULL);
3625 }
3626 #endif // INCLUDE_CDS
3627
3628 #ifndef PRODUCT
3629 // Determine whether LogVMOutput should be implicitly turned on.
3630 static bool use_vm_log() {
3631 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3632 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3633 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3634 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3635 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3636 return true;
3637 }
3638
3639 #ifdef COMPILER1
3640 if (PrintC1Statistics) {
3641 return true;
3642 }
3643 #endif // COMPILER1
3644
3645 #ifdef COMPILER2
3646 if (PrintOptoAssembly || PrintOptoStatistics) {
3647 return true;
3648 }
3649 #endif // COMPILER2
3650
3651 return false;
3652 }
3653
3654 #endif // PRODUCT
3655
3656 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3657 for (int index = 0; index < args->nOptions; index++) {
3658 const JavaVMOption* option = args->options + index;
3659 const char* tail;
3660 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3661 return true;
3662 }
3663 }
3664 return false;
3665 }
3666
3667 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3668 const char* vm_options_file,
3669 const int vm_options_file_pos,
3670 ScopedVMInitArgs* vm_options_file_args,
3671 ScopedVMInitArgs* args_out) {
3672 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3673 if (code != JNI_OK) {
3674 return code;
3675 }
3676
3677 if (vm_options_file_args->get()->nOptions < 1) {
3678 return JNI_OK;
3679 }
3680
3681 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3682 jio_fprintf(defaultStream::error_stream(),
3683 "A VM options file may not refer to a VM options file. "
3684 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3685 "options file '%s' in options container '%s' is an error.\n",
3686 vm_options_file_args->vm_options_file_arg(),
3687 vm_options_file_args->container_name());
3688 return JNI_EINVAL;
3689 }
3690
3691 return args_out->insert(args, vm_options_file_args->get(),
3692 vm_options_file_pos);
3693 }
3694
3695 // Expand -XX:VMOptionsFile found in args_in as needed.
3696 // mod_args and args_out parameters may return values as needed.
3697 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3698 ScopedVMInitArgs* mod_args,
3699 JavaVMInitArgs** args_out) {
3700 jint code = match_special_option_and_act(args_in, mod_args);
3701 if (code != JNI_OK) {
3702 return code;
3703 }
3704
3705 if (mod_args->is_set()) {
3706 // args_in contains -XX:VMOptionsFile and mod_args contains the
3707 // original options from args_in along with the options expanded
3708 // from the VMOptionsFile. Return a short-hand to the caller.
3709 *args_out = mod_args->get();
3710 } else {
3711 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3712 }
3713 return JNI_OK;
3714 }
3715
3716 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3717 ScopedVMInitArgs* args_out) {
3718 // Remaining part of option string
3719 const char* tail;
3720 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3721
3722 for (int index = 0; index < args->nOptions; index++) {
3723 const JavaVMOption* option = args->options + index;
3724 if (match_option(option, "-XX:Flags=", &tail)) {
3725 Arguments::set_jvm_flags_file(tail);
3726 continue;
3727 }
3728 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3729 if (vm_options_file_args.found_vm_options_file_arg()) {
3730 jio_fprintf(defaultStream::error_stream(),
3731 "The option '%s' is already specified in the options "
3732 "container '%s' so the specification of '%s' in the "
3733 "same options container is an error.\n",
3734 vm_options_file_args.vm_options_file_arg(),
3735 vm_options_file_args.container_name(),
3736 option->optionString);
3737 return JNI_EINVAL;
3738 }
3739 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3740 // If there's a VMOptionsFile, parse that
3741 jint code = insert_vm_options_file(args, tail, index,
3742 &vm_options_file_args, args_out);
3743 if (code != JNI_OK) {
3744 return code;
3745 }
3746 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3747 if (args_out->is_set()) {
3748 // The VMOptions file inserted some options so switch 'args'
3749 // to the new set of options, and continue processing which
3750 // preserves "last option wins" semantics.
3751 args = args_out->get();
3752 // The first option from the VMOptionsFile replaces the
3753 // current option. So we back track to process the
3754 // replacement option.
3755 index--;
3756 }
3757 continue;
3758 }
3759 if (match_option(option, "-XX:+PrintVMOptions")) {
3760 PrintVMOptions = true;
3761 continue;
3762 }
3763 if (match_option(option, "-XX:-PrintVMOptions")) {
3764 PrintVMOptions = false;
3765 continue;
3766 }
3767 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3768 IgnoreUnrecognizedVMOptions = true;
3769 continue;
3770 }
3771 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3772 IgnoreUnrecognizedVMOptions = false;
3773 continue;
3774 }
3775 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3776 JVMFlag::printFlags(tty, false);
3777 vm_exit(0);
3778 }
3779 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3780 #if INCLUDE_NMT
3781 // The launcher did not setup nmt environment variable properly.
3782 if (!MemTracker::check_launcher_nmt_support(tail)) {
3783 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3784 }
3785
3786 // Verify if nmt option is valid.
3787 if (MemTracker::verify_nmt_option()) {
3788 // Late initialization, still in single-threaded mode.
3789 if (MemTracker::tracking_level() >= NMT_summary) {
3790 MemTracker::init();
3791 }
3792 } else {
3793 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3794 }
3795 continue;
3796 #else
3797 jio_fprintf(defaultStream::error_stream(),
3798 "Native Memory Tracking is not supported in this VM\n");
3799 return JNI_ERR;
3800 #endif
3801 }
3802
3803 #ifndef PRODUCT
3804 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3805 JVMFlag::printFlags(tty, true);
3806 vm_exit(0);
3807 }
3808 #endif
3809 }
3810 return JNI_OK;
3811 }
3812
3813 static void print_options(const JavaVMInitArgs *args) {
3814 const char* tail;
3815 for (int index = 0; index < args->nOptions; index++) {
3816 const JavaVMOption *option = args->options + index;
3817 if (match_option(option, "-XX:", &tail)) {
3818 logOption(tail);
3819 }
3820 }
3821 }
3822
3823 bool Arguments::handle_deprecated_print_gc_flags() {
3824 if (PrintGC) {
3825 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3826 }
3827 if (PrintGCDetails) {
3828 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3829 }
3830
3831 if (_gc_log_filename != NULL) {
3832 // -Xloggc was used to specify a filename
3833 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3834
3835 LogTarget(Error, logging) target;
3836 LogStream errstream(target);
3837 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3838 } else if (PrintGC || PrintGCDetails) {
3839 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3840 }
3841 return true;
3842 }
3843
3844 // Parse entry point called from JNI_CreateJavaVM
3845
3846 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3847 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3848
3849 // Initialize ranges and constraints
3850 JVMFlagRangeList::init();
3851 JVMFlagConstraintList::init();
3852
3853 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3854 const char* hotspotrc = ".hotspotrc";
3855 bool settings_file_specified = false;
3856 bool needs_hotspotrc_warning = false;
3857 ScopedVMInitArgs initial_vm_options_args("");
3858 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3859 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3860
3861 // Pointers to current working set of containers
3862 JavaVMInitArgs* cur_cmd_args;
3863 JavaVMInitArgs* cur_vm_options_args;
3864 JavaVMInitArgs* cur_java_options_args;
3865 JavaVMInitArgs* cur_java_tool_options_args;
3866
3867 // Containers for modified/expanded options
3868 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3869 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3870 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3871 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3872
3873
3874 jint code =
3875 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3876 if (code != JNI_OK) {
3877 return code;
3878 }
3879
3880 code = parse_java_options_environment_variable(&initial_java_options_args);
3881 if (code != JNI_OK) {
3882 return code;
3883 }
3884
3885 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3886 char *vmoptions = ClassLoader::lookup_vm_options();
3887 if (vmoptions != NULL) {
3888 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3889 FREE_C_HEAP_ARRAY(char, vmoptions);
3890 if (code != JNI_OK) {
3891 return code;
3892 }
3893 }
3894
3895 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3896 &mod_java_tool_options_args,
3897 &cur_java_tool_options_args);
3898 if (code != JNI_OK) {
3899 return code;
3900 }
3901
3902 code = expand_vm_options_as_needed(initial_cmd_args,
3903 &mod_cmd_args,
3904 &cur_cmd_args);
3905 if (code != JNI_OK) {
3906 return code;
3907 }
3908
3909 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3910 &mod_java_options_args,
3911 &cur_java_options_args);
3912 if (code != JNI_OK) {
3913 return code;
3914 }
3915
3916 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3917 &mod_vm_options_args,
3918 &cur_vm_options_args);
3919 if (code != JNI_OK) {
3920 return code;
3921 }
3922
3923 const char* flags_file = Arguments::get_jvm_flags_file();
3924 settings_file_specified = (flags_file != NULL);
3925
3926 if (IgnoreUnrecognizedVMOptions) {
3927 cur_cmd_args->ignoreUnrecognized = true;
3928 cur_java_tool_options_args->ignoreUnrecognized = true;
3929 cur_java_options_args->ignoreUnrecognized = true;
3930 }
3931
3932 // Parse specified settings file
3933 if (settings_file_specified) {
3934 if (!process_settings_file(flags_file, true,
3935 cur_cmd_args->ignoreUnrecognized)) {
3936 return JNI_EINVAL;
3937 }
3938 } else {
3939 #ifdef ASSERT
3940 // Parse default .hotspotrc settings file
3941 if (!process_settings_file(".hotspotrc", false,
3942 cur_cmd_args->ignoreUnrecognized)) {
3943 return JNI_EINVAL;
3944 }
3945 #else
3946 struct stat buf;
3947 if (os::stat(hotspotrc, &buf) == 0) {
3948 needs_hotspotrc_warning = true;
3949 }
3950 #endif
3951 }
3952
3953 if (PrintVMOptions) {
3954 print_options(cur_java_tool_options_args);
3955 print_options(cur_cmd_args);
3956 print_options(cur_java_options_args);
3957 }
3958
3959 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3960 jint result = parse_vm_init_args(cur_vm_options_args,
3961 cur_java_tool_options_args,
3962 cur_java_options_args,
3963 cur_cmd_args);
3964
3965 if (result != JNI_OK) {
3966 return result;
3967 }
3968
3969 #if INCLUDE_CDS
3970 // Initialize shared archive paths which could include both base and dynamic archive paths
3971 if (!init_shared_archive_paths()) {
3972 return JNI_ENOMEM;
3973 }
3974 #endif
3975
3976 // Delay warning until here so that we've had a chance to process
3977 // the -XX:-PrintWarnings flag
3978 if (needs_hotspotrc_warning) {
3979 warning("%s file is present but has been ignored. "
3980 "Run with -XX:Flags=%s to load the file.",
3981 hotspotrc, hotspotrc);
3982 }
3983
3984 if (needs_module_property_warning) {
3985 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3986 " names that are reserved for internal use.");
3987 }
3988
3989 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3990 UNSUPPORTED_OPTION(UseLargePages);
3991 #endif
3992
3993 #if defined(AIX)
3994 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3995 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3996 #endif
3997
3998 #ifndef PRODUCT
3999 if (TraceBytecodesAt != 0) {
4000 TraceBytecodes = true;
4001 }
4002 if (CountCompiledCalls) {
4003 if (UseCounterDecay) {
4004 warning("UseCounterDecay disabled because CountCalls is set");
4005 UseCounterDecay = false;
4006 }
4007 }
4008 #endif // PRODUCT
4009
4010 if (ScavengeRootsInCode == 0) {
4011 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4012 warning("Forcing ScavengeRootsInCode non-zero");
4013 }
4014 ScavengeRootsInCode = 1;
4015 }
4016
4017 if (!handle_deprecated_print_gc_flags()) {
4018 return JNI_EINVAL;
4019 }
4020
4021 // Set object alignment values.
4022 set_object_alignment();
4023
4024 #if !INCLUDE_CDS
4025 if (DumpSharedSpaces || RequireSharedSpaces) {
4026 jio_fprintf(defaultStream::error_stream(),
4027 "Shared spaces are not supported in this VM\n");
4028 return JNI_ERR;
4029 }
4030 if (DumpLoadedClassList != NULL) {
4031 jio_fprintf(defaultStream::error_stream(),
4032 "DumpLoadedClassList is not supported in this VM\n");
4033 return JNI_ERR;
4034 }
4035 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4036 log_is_enabled(Info, cds)) {
4037 warning("Shared spaces are not supported in this VM");
4038 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4039 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4040 }
4041 no_shared_spaces("CDS Disabled");
4042 #endif // INCLUDE_CDS
4043
4044 #ifndef TIERED
4045 if (FLAG_IS_CMDLINE(CompilationMode)) {
4046 warning("CompilationMode has no effect in non-tiered VMs");
4047 }
4048 #endif
4049
4050 return JNI_OK;
4051 }
4052
4053 jint Arguments::apply_ergo() {
4054 // Set flags based on ergonomics.
4055 jint result = set_ergonomics_flags();
4056 if (result != JNI_OK) return result;
4057
4058 // Set heap size based on available physical memory
4059 set_heap_size();
4060
4061 GCConfig::arguments()->initialize();
4062
4063 set_shared_spaces_flags();
4064
4065 // Initialize Metaspace flags and alignments
4066 Metaspace::ergo_initialize();
4067
4068 // Set compiler flags after GC is selected and GC specific
4069 // flags (LoopStripMiningIter) are set.
4070 CompilerConfig::ergo_initialize();
4071
4072 // Set bytecode rewriting flags
4073 set_bytecode_flags();
4074
4075 // Set flags if aggressive optimization flags are enabled
4076 jint code = set_aggressive_opts_flags();
4077 if (code != JNI_OK) {
4078 return code;
4079 }
4080
4081 // Turn off biased locking for locking debug mode flags,
4082 // which are subtly different from each other but neither works with
4083 // biased locking
4084 if (UseHeavyMonitors
4085 #ifdef COMPILER1
4086 || !UseFastLocking
4087 #endif // COMPILER1
4088 #if INCLUDE_JVMCI
4089 || !JVMCIUseFastLocking
4090 #endif
4091 ) {
4092 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4093 // flag set to true on command line; warn the user that they
4094 // can't enable biased locking here
4095 warning("Biased Locking is not supported with locking debug flags"
4096 "; ignoring UseBiasedLocking flag." );
4097 }
4098 UseBiasedLocking = false;
4099 }
4100
4101 #ifdef CC_INTERP
4102 // Clear flags not supported on zero.
4103 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4104 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4105 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4106 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4107 #endif // CC_INTERP
4108
4109 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4110 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4111 DebugNonSafepoints = true;
4112 }
4113
4114 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4115 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4116 }
4117
4118 // Treat the odd case where local verification is enabled but remote
4119 // verification is not as if both were enabled.
4120 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4121 log_info(verification)("Turning on remote verification because local verification is on");
4122 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4123 }
4124
4125 #ifndef PRODUCT
4126 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4127 if (use_vm_log()) {
4128 LogVMOutput = true;
4129 }
4130 }
4131 #endif // PRODUCT
4132
4133 if (PrintCommandLineFlags) {
4134 JVMFlag::printSetFlags(tty);
4135 }
4136
4137 // Apply CPU specific policy for the BiasedLocking
4138 if (UseBiasedLocking) {
4139 if (!VM_Version::use_biased_locking() &&
4140 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4141 UseBiasedLocking = false;
4142 }
4143 }
4144 #ifdef COMPILER2
4145 if (!UseBiasedLocking) {
4146 UseOptoBiasInlining = false;
4147 }
4148 #endif
4149
4150 return JNI_OK;
4151 }
4152
4153 jint Arguments::adjust_after_os() {
4154 if (UseNUMA) {
4155 if (UseParallelGC) {
4156 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4157 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4158 }
4159 }
4160 // UseNUMAInterleaving is set to ON for all collectors and platforms when
4161 // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and
4162 // survivor spaces on top of NUMA allocation policy for the eden space.
4163 // Non NUMA-aware collectors will interleave all of the heap spaces across
4164 // NUMA nodes.
4165 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4166 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4167 }
4168 }
4169 return JNI_OK;
4170 }
4171
4172 int Arguments::PropertyList_count(SystemProperty* pl) {
4173 int count = 0;
4174 while(pl != NULL) {
4175 count++;
4176 pl = pl->next();
4177 }
4178 return count;
4179 }
4180
4181 // Return the number of readable properties.
4182 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4183 int count = 0;
4184 while(pl != NULL) {
4185 if (pl->is_readable()) {
4186 count++;
4187 }
4188 pl = pl->next();
4189 }
4190 return count;
4191 }
4192
4193 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4194 assert(key != NULL, "just checking");
4195 SystemProperty* prop;
4196 for (prop = pl; prop != NULL; prop = prop->next()) {
4197 if (strcmp(key, prop->key()) == 0) return prop->value();
4198 }
4199 return NULL;
4200 }
4201
4202 // Return the value of the requested property provided that it is a readable property.
4203 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4204 assert(key != NULL, "just checking");
4205 SystemProperty* prop;
4206 // Return the property value if the keys match and the property is not internal or
4207 // it's the special internal property "jdk.boot.class.path.append".
4208 for (prop = pl; prop != NULL; prop = prop->next()) {
4209 if (strcmp(key, prop->key()) == 0) {
4210 if (!prop->internal()) {
4211 return prop->value();
4212 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4213 return prop->value();
4214 } else {
4215 // Property is internal and not jdk.boot.class.path.append so return NULL.
4216 return NULL;
4217 }
4218 }
4219 }
4220 return NULL;
4221 }
4222
4223 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4224 int count = 0;
4225 const char* ret_val = NULL;
4226
4227 while(pl != NULL) {
4228 if(count >= index) {
4229 ret_val = pl->key();
4230 break;
4231 }
4232 count++;
4233 pl = pl->next();
4234 }
4235
4236 return ret_val;
4237 }
4238
4239 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4240 int count = 0;
4241 char* ret_val = NULL;
4242
4243 while(pl != NULL) {
4244 if(count >= index) {
4245 ret_val = pl->value();
4246 break;
4247 }
4248 count++;
4249 pl = pl->next();
4250 }
4251
4252 return ret_val;
4253 }
4254
4255 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4256 SystemProperty* p = *plist;
4257 if (p == NULL) {
4258 *plist = new_p;
4259 } else {
4260 while (p->next() != NULL) {
4261 p = p->next();
4262 }
4263 p->set_next(new_p);
4264 }
4265 }
4266
4267 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4268 bool writeable, bool internal) {
4269 if (plist == NULL)
4270 return;
4271
4272 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4273 PropertyList_add(plist, new_p);
4274 }
4275
4276 void Arguments::PropertyList_add(SystemProperty *element) {
4277 PropertyList_add(&_system_properties, element);
4278 }
4279
4280 // This add maintains unique property key in the list.
4281 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4282 PropertyAppendable append, PropertyWriteable writeable,
4283 PropertyInternal internal) {
4284 if (plist == NULL)
4285 return;
4286
4287 // If property key exist then update with new value.
4288 SystemProperty* prop;
4289 for (prop = *plist; prop != NULL; prop = prop->next()) {
4290 if (strcmp(k, prop->key()) == 0) {
4291 if (append == AppendProperty) {
4292 prop->append_value(v);
4293 } else {
4294 prop->set_value(v);
4295 }
4296 return;
4297 }
4298 }
4299
4300 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4301 }
4302
4303 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4304 // Returns true if all of the source pointed by src has been copied over to
4305 // the destination buffer pointed by buf. Otherwise, returns false.
4306 // Notes:
4307 // 1. If the length (buflen) of the destination buffer excluding the
4308 // NULL terminator character is not long enough for holding the expanded
4309 // pid characters, it also returns false instead of returning the partially
4310 // expanded one.
4311 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4312 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4313 char* buf, size_t buflen) {
4314 const char* p = src;
4315 char* b = buf;
4316 const char* src_end = &src[srclen];
4317 char* buf_end = &buf[buflen - 1];
4318
4319 while (p < src_end && b < buf_end) {
4320 if (*p == '%') {
4321 switch (*(++p)) {
4322 case '%': // "%%" ==> "%"
4323 *b++ = *p++;
4324 break;
4325 case 'p': { // "%p" ==> current process id
4326 // buf_end points to the character before the last character so
4327 // that we could write '\0' to the end of the buffer.
4328 size_t buf_sz = buf_end - b + 1;
4329 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4330
4331 // if jio_snprintf fails or the buffer is not long enough to hold
4332 // the expanded pid, returns false.
4333 if (ret < 0 || ret >= (int)buf_sz) {
4334 return false;
4335 } else {
4336 b += ret;
4337 assert(*b == '\0', "fail in copy_expand_pid");
4338 if (p == src_end && b == buf_end + 1) {
4339 // reach the end of the buffer.
4340 return true;
4341 }
4342 }
4343 p++;
4344 break;
4345 }
4346 default :
4347 *b++ = '%';
4348 }
4349 } else {
4350 *b++ = *p++;
4351 }
4352 }
4353 *b = '\0';
4354 return (p == src_end); // return false if not all of the source was copied
4355 }