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::_default_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 { "PrintVMQWaitTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
526 { "UseNewFieldLayout", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
527 { "ForceNUMA", 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 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
553
554 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
555 // These entries will generate build errors. Their purpose is to test the macros.
556 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
557 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
558 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
559 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
560 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
562 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
563 #endif
564
565 { NULL, JDK_Version(0), JDK_Version(0) }
566 };
567
568 // Flags that are aliases for other flags.
569 typedef struct {
570 const char* alias_name;
571 const char* real_name;
572 } AliasedFlag;
573
574 static AliasedFlag const aliased_jvm_flags[] = {
575 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
576 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
577 { NULL, NULL}
578 };
579
580 // NOTE: A compatibility request will be necessary for each alias to be removed.
581 static AliasedLoggingFlag const aliased_logging_flags[] = {
582 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
583 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
584 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
585 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
586 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
587 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
588 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
589 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
590 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
591 { "TraceInvokeDynamic", LogLevel::Debug, true, LOG_TAGS(methodhandles, indy) },
592 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
593 { "TraceMethodHandles", LogLevel::Info, true, LOG_TAGS(methodhandles) },
594 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
595 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
596 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
597 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
598 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
599 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
600 };
601
602 #ifndef PRODUCT
603 // These options are removed in jdk9. Remove this code for jdk10.
604 static AliasedFlag const removed_develop_logging_flags[] = {
605 { "TraceClassInitialization", "-Xlog:class+init" },
606 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
607 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
608 { "TraceItables", "-Xlog:itables=debug" },
609 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
610 { "TraceSafepoint", "-Xlog:safepoint=debug" },
611 { "TraceStartupTime", "-Xlog:startuptime" },
612 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
613 { "PrintVtables", "-Xlog:vtables=debug" },
614 { "VerboseVerification", "-Xlog:verification" },
615 { NULL, NULL }
616 };
617 #endif //PRODUCT
618
619 // Return true if "v" is less than "other", where "other" may be "undefined".
620 static bool version_less_than(JDK_Version v, JDK_Version other) {
621 assert(!v.is_undefined(), "must be defined");
622 if (!other.is_undefined() && v.compare(other) >= 0) {
623 return false;
624 } else {
625 return true;
626 }
627 }
628
629 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
630 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
631 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
632 flag = special_jvm_flags[i];
633 return true;
634 }
635 }
636 return false;
637 }
638
639 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
640 assert(version != NULL, "Must provide a version buffer");
641 SpecialFlag flag;
642 if (lookup_special_flag(flag_name, flag)) {
643 if (!flag.obsolete_in.is_undefined()) {
644 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
645 *version = flag.obsolete_in;
646 // This flag may have been marked for obsoletion in this version, but we may not
647 // have actually removed it yet. Rather than ignoring it as soon as we reach
648 // this version we allow some time for the removal to happen. So if the flag
649 // still actually exists we process it as normal, but issue an adjusted warning.
650 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
651 if (real_flag != NULL) {
652 char version_str[256];
653 version->to_string(version_str, sizeof(version_str));
654 warning("Temporarily processing option %s; support is scheduled for removal in %s",
655 flag_name, version_str);
656 return false;
657 }
658 return true;
659 }
660 }
661 }
662 return false;
663 }
664
665 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
666 assert(version != NULL, "Must provide a version buffer");
667 SpecialFlag flag;
668 if (lookup_special_flag(flag_name, flag)) {
669 if (!flag.deprecated_in.is_undefined()) {
670 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
671 version_less_than(JDK_Version::current(), flag.expired_in)) {
672 *version = flag.deprecated_in;
673 return 1;
674 } else {
675 return -1;
676 }
677 }
678 }
679 return 0;
680 }
681
682 #ifndef PRODUCT
683 const char* Arguments::removed_develop_logging_flag_name(const char* name){
684 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
685 const AliasedFlag& flag = removed_develop_logging_flags[i];
686 if (strcmp(flag.alias_name, name) == 0) {
687 return flag.real_name;
688 }
689 }
690 return NULL;
691 }
692 #endif // PRODUCT
693
694 const char* Arguments::real_flag_name(const char *flag_name) {
695 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
696 const AliasedFlag& flag_status = aliased_jvm_flags[i];
697 if (strcmp(flag_status.alias_name, flag_name) == 0) {
698 return flag_status.real_name;
699 }
700 }
701 return flag_name;
702 }
703
704 #ifdef ASSERT
705 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
706 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
707 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
708 return true;
709 }
710 }
711 return false;
712 }
713
714 // Verifies the correctness of the entries in the special_jvm_flags table.
715 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
716 // version being earlier than the deprecation version, then a warning is issued
717 // and verification fails - by returning false. If it is detected that the table
718 // is out of date, with respect to the current version, then ideally a warning is
719 // issued but verification does not fail. This allows the VM to operate when the
720 // version is first updated, without needing to update all the impacted flags at
721 // the same time. In practice we can't issue the warning immediately when the version
722 // is updated as it occurs for every test and some tests are not prepared to handle
723 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
724 // if the check_globals flag is true, and in addition allow a grace period and only
725 // check for stale flags when we hit build 25 (which is far enough into the 6 month
726 // release cycle that all flag updates should have been processed, whilst still
727 // leaving time to make the change before RDP2).
728 // We use a gtest to call this, passing true, so that we can detect stale flags before
729 // the end of the release cycle.
730
731 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
732
733 bool Arguments::verify_special_jvm_flags(bool check_globals) {
734 bool success = true;
735 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
736 const SpecialFlag& flag = special_jvm_flags[i];
737 if (lookup_special_flag(flag.name, i)) {
738 warning("Duplicate special flag declaration \"%s\"", flag.name);
739 success = false;
740 }
741 if (flag.deprecated_in.is_undefined() &&
742 flag.obsolete_in.is_undefined()) {
743 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
744 success = false;
745 }
746
747 if (!flag.deprecated_in.is_undefined()) {
748 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
749 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
750 success = false;
751 }
752
753 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
754 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
755 success = false;
756 }
757 }
758
759 if (!flag.obsolete_in.is_undefined()) {
760 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
761 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
762 success = false;
763 }
764
765 // if flag has become obsolete it should not have a "globals" flag defined anymore.
766 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
767 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
768 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
769 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
770 success = false;
771 }
772 }
773
774 } else if (!flag.expired_in.is_undefined()) {
775 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
776 success = false;
777 }
778
779 if (!flag.expired_in.is_undefined()) {
780 // if flag has become expired it should not have a "globals" flag defined anymore.
781 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
782 !version_less_than(JDK_Version::current(), flag.expired_in)) {
783 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
784 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
785 success = false;
786 }
787 }
788 }
789 }
790 return success;
791 }
792 #endif
793
794 // Parses a size specification string.
795 bool Arguments::atojulong(const char *s, julong* result) {
796 julong n = 0;
797
798 // First char must be a digit. Don't allow negative numbers or leading spaces.
799 if (!isdigit(*s)) {
800 return false;
801 }
802
803 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
804 char* remainder;
805 errno = 0;
806 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
807 if (errno != 0) {
808 return false;
809 }
810
811 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
812 if (remainder == s || strlen(remainder) > 1) {
813 return false;
814 }
815
816 switch (*remainder) {
817 case 'T': case 't':
818 *result = n * G * K;
819 // Check for overflow.
820 if (*result/((julong)G * K) != n) return false;
821 return true;
822 case 'G': case 'g':
823 *result = n * G;
824 if (*result/G != n) return false;
825 return true;
826 case 'M': case 'm':
827 *result = n * M;
828 if (*result/M != n) return false;
829 return true;
830 case 'K': case 'k':
831 *result = n * K;
832 if (*result/K != n) return false;
833 return true;
834 case '\0':
835 *result = n;
836 return true;
837 default:
838 return false;
839 }
840 }
841
842 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
843 if (size < min_size) return arg_too_small;
844 if (size > max_size) return arg_too_big;
845 return arg_in_range;
846 }
847
848 // Describe an argument out of range error
849 void Arguments::describe_range_error(ArgsRange errcode) {
850 switch(errcode) {
851 case arg_too_big:
852 jio_fprintf(defaultStream::error_stream(),
853 "The specified size exceeds the maximum "
854 "representable size.\n");
855 break;
856 case arg_too_small:
857 case arg_unreadable:
858 case arg_in_range:
859 // do nothing for now
860 break;
861 default:
862 ShouldNotReachHere();
863 }
864 }
865
866 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
867 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
868 return true;
869 } else {
870 return false;
871 }
872 }
873
874 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
875 char* end;
876 errno = 0;
877 double v = strtod(value, &end);
878 if ((errno != 0) || (*end != 0)) {
879 return false;
880 }
881
882 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
883 return true;
884 }
885 return false;
886 }
887
888 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
889 julong v;
890 int int_v;
891 intx intx_v;
892 bool is_neg = false;
893
894 if (flag == NULL) {
895 return false;
896 }
897
898 // Check the sign first since atojulong() parses only unsigned values.
899 if (*value == '-') {
900 if (!flag->is_intx() && !flag->is_int()) {
901 return false;
902 }
903 value++;
904 is_neg = true;
905 }
906 if (!Arguments::atojulong(value, &v)) {
907 return false;
908 }
909 if (flag->is_int()) {
910 int_v = (int) v;
911 if (is_neg) {
912 int_v = -int_v;
913 }
914 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
915 } else if (flag->is_uint()) {
916 uint uint_v = (uint) v;
917 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
918 } else if (flag->is_intx()) {
919 intx_v = (intx) v;
920 if (is_neg) {
921 intx_v = -intx_v;
922 }
923 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
924 } else if (flag->is_uintx()) {
925 uintx uintx_v = (uintx) v;
926 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
927 } else if (flag->is_uint64_t()) {
928 uint64_t uint64_t_v = (uint64_t) v;
929 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
930 } else if (flag->is_size_t()) {
931 size_t size_t_v = (size_t) v;
932 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
933 } else if (flag->is_double()) {
934 double double_v = (double) v;
935 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
936 } else {
937 return false;
938 }
939 }
940
941 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
942 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
943 // Contract: JVMFlag always returns a pointer that needs freeing.
944 FREE_C_HEAP_ARRAY(char, value);
945 return true;
946 }
947
948 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
949 const char* old_value = "";
950 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
951 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
952 size_t new_len = strlen(new_value);
953 const char* value;
954 char* free_this_too = NULL;
955 if (old_len == 0) {
956 value = new_value;
957 } else if (new_len == 0) {
958 value = old_value;
959 } else {
960 size_t length = old_len + 1 + new_len + 1;
961 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
962 // each new setting adds another LINE to the switch:
963 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
964 value = buf;
965 free_this_too = buf;
966 }
967 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
968 // JVMFlag always returns a pointer that needs freeing.
969 FREE_C_HEAP_ARRAY(char, value);
970 // JVMFlag made its own copy, so I must delete my own temp. buffer.
971 FREE_C_HEAP_ARRAY(char, free_this_too);
972 return true;
973 }
974
975 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
976 const char* real_name = real_flag_name(arg);
977 JDK_Version since = JDK_Version();
978 switch (is_deprecated_flag(arg, &since)) {
979 case -1: {
980 // Obsolete or expired, so don't process normally,
981 // but allow for an obsolete flag we're still
982 // temporarily allowing.
983 if (!is_obsolete_flag(arg, &since)) {
984 return real_name;
985 }
986 // Note if we're not considered obsolete then we can't be expired either
987 // as obsoletion must come first.
988 return NULL;
989 }
990 case 0:
991 return real_name;
992 case 1: {
993 if (warn) {
994 char version[256];
995 since.to_string(version, sizeof(version));
996 if (real_name != arg) {
997 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
998 arg, version, real_name);
999 } else {
1000 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1001 arg, version);
1002 }
1003 }
1004 return real_name;
1005 }
1006 }
1007 ShouldNotReachHere();
1008 return NULL;
1009 }
1010
1011 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1012 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1013 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1014 const int max_tagset_size = 256;
1015 int max_tagset_len = max_tagset_size - 1;
1016 char tagset_buffer[max_tagset_size];
1017 tagset_buffer[0] = '\0';
1018
1019 // Write tag-set for aliased logging option, in string list form
1020 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1021 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1022 if (i > 0) {
1023 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1024 }
1025 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1026 }
1027 if (!alf.exactMatch) {
1028 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1029 }
1030 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1031 (on) ? "+" : "-",
1032 name,
1033 tagset_buffer,
1034 (on) ? LogLevel::name(alf.level) : "off");
1035 }
1036
1037 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1038 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1039 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1040 if (strcmp(alf.alias_name, name) == 0) {
1041 log_deprecated_flag(name, on, alf);
1042 return alf;
1043 }
1044 }
1045 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1046 return a;
1047 }
1048
1049 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1050
1051 // range of acceptable characters spelled out for portability reasons
1052 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1053 #define BUFLEN 255
1054 char name[BUFLEN+1];
1055 char dummy;
1056 const char* real_name;
1057 bool warn_if_deprecated = true;
1058
1059 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1060 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1061 if (alf.alias_name != NULL){
1062 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1063 return true;
1064 }
1065 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1066 if (real_name == NULL) {
1067 return false;
1068 }
1069 JVMFlag* flag = JVMFlag::find_flag(real_name);
1070 return set_bool_flag(flag, false, origin);
1071 }
1072 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1073 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1074 if (alf.alias_name != NULL){
1075 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1076 return true;
1077 }
1078 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1079 if (real_name == NULL) {
1080 return false;
1081 }
1082 JVMFlag* flag = JVMFlag::find_flag(real_name);
1083 return set_bool_flag(flag, true, origin);
1084 }
1085
1086 char punct;
1087 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1088 const char* value = strchr(arg, '=') + 1;
1089
1090 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1091 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1092 if (alf.alias_name != NULL) {
1093 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1094 return true;
1095 }
1096 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1097 if (real_name == NULL) {
1098 return false;
1099 }
1100 JVMFlag* flag = JVMFlag::find_flag(real_name);
1101 if (flag != NULL && flag->is_ccstr()) {
1102 if (flag->ccstr_accumulates()) {
1103 return append_to_string_flag(flag, value, origin);
1104 } else {
1105 if (value[0] == '\0') {
1106 value = NULL;
1107 }
1108 return set_string_flag(flag, value, origin);
1109 }
1110 } else {
1111 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1112 }
1113 }
1114
1115 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1116 const char* value = strchr(arg, '=') + 1;
1117 // -XX:Foo:=xxx will reset the string flag to the given value.
1118 if (value[0] == '\0') {
1119 value = NULL;
1120 }
1121 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1122 if (real_name == NULL) {
1123 return false;
1124 }
1125 JVMFlag* flag = JVMFlag::find_flag(real_name);
1126 return set_string_flag(flag, value, origin);
1127 }
1128
1129 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1130 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1131 #define NUMBER_RANGE "[0123456789eE+-]"
1132 char value[BUFLEN + 1];
1133 char value2[BUFLEN + 1];
1134 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1135 // Looks like a floating-point number -- try again with more lenient format string
1136 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1137 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1138 if (real_name == NULL) {
1139 return false;
1140 }
1141 JVMFlag* flag = JVMFlag::find_flag(real_name);
1142 return set_fp_numeric_flag(flag, value, origin);
1143 }
1144 }
1145
1146 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1147 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1148 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1149 if (real_name == NULL) {
1150 return false;
1151 }
1152 JVMFlag* flag = JVMFlag::find_flag(real_name);
1153 return set_numeric_flag(flag, value, origin);
1154 }
1155
1156 return false;
1157 }
1158
1159 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1160 assert(bldarray != NULL, "illegal argument");
1161
1162 if (arg == NULL) {
1163 return;
1164 }
1165
1166 int new_count = *count + 1;
1167
1168 // expand the array and add arg to the last element
1169 if (*bldarray == NULL) {
1170 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1171 } else {
1172 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1173 }
1174 (*bldarray)[*count] = os::strdup_check_oom(arg);
1175 *count = new_count;
1176 }
1177
1178 void Arguments::build_jvm_args(const char* arg) {
1179 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1180 }
1181
1182 void Arguments::build_jvm_flags(const char* arg) {
1183 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1184 }
1185
1186 // utility function to return a string that concatenates all
1187 // strings in a given char** array
1188 const char* Arguments::build_resource_string(char** args, int count) {
1189 if (args == NULL || count == 0) {
1190 return NULL;
1191 }
1192 size_t length = 0;
1193 for (int i = 0; i < count; i++) {
1194 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1195 }
1196 char* s = NEW_RESOURCE_ARRAY(char, length);
1197 char* dst = s;
1198 for (int j = 0; j < count; j++) {
1199 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1200 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1201 dst += offset;
1202 length -= offset;
1203 }
1204 return (const char*) s;
1205 }
1206
1207 void Arguments::print_on(outputStream* st) {
1208 st->print_cr("VM Arguments:");
1209 if (num_jvm_flags() > 0) {
1210 st->print("jvm_flags: "); print_jvm_flags_on(st);
1211 st->cr();
1212 }
1213 if (num_jvm_args() > 0) {
1214 st->print("jvm_args: "); print_jvm_args_on(st);
1215 st->cr();
1216 }
1217 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1218 if (_java_class_path != NULL) {
1219 char* path = _java_class_path->value();
1220 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1221 }
1222 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1223 }
1224
1225 void Arguments::print_summary_on(outputStream* st) {
1226 // Print the command line. Environment variables that are helpful for
1227 // reproducing the problem are written later in the hs_err file.
1228 // flags are from setting file
1229 if (num_jvm_flags() > 0) {
1230 st->print_raw("Settings File: ");
1231 print_jvm_flags_on(st);
1232 st->cr();
1233 }
1234 // args are the command line and environment variable arguments.
1235 st->print_raw("Command Line: ");
1236 if (num_jvm_args() > 0) {
1237 print_jvm_args_on(st);
1238 }
1239 // this is the classfile and any arguments to the java program
1240 if (java_command() != NULL) {
1241 st->print("%s", java_command());
1242 }
1243 st->cr();
1244 }
1245
1246 void Arguments::print_jvm_flags_on(outputStream* st) {
1247 if (_num_jvm_flags > 0) {
1248 for (int i=0; i < _num_jvm_flags; i++) {
1249 st->print("%s ", _jvm_flags_array[i]);
1250 }
1251 }
1252 }
1253
1254 void Arguments::print_jvm_args_on(outputStream* st) {
1255 if (_num_jvm_args > 0) {
1256 for (int i=0; i < _num_jvm_args; i++) {
1257 st->print("%s ", _jvm_args_array[i]);
1258 }
1259 }
1260 }
1261
1262 bool Arguments::process_argument(const char* arg,
1263 jboolean ignore_unrecognized,
1264 JVMFlag::Flags origin) {
1265 JDK_Version since = JDK_Version();
1266
1267 if (parse_argument(arg, origin)) {
1268 return true;
1269 }
1270
1271 // Determine if the flag has '+', '-', or '=' characters.
1272 bool has_plus_minus = (*arg == '+' || *arg == '-');
1273 const char* const argname = has_plus_minus ? arg + 1 : arg;
1274
1275 size_t arg_len;
1276 const char* equal_sign = strchr(argname, '=');
1277 if (equal_sign == NULL) {
1278 arg_len = strlen(argname);
1279 } else {
1280 arg_len = equal_sign - argname;
1281 }
1282
1283 // Only make the obsolete check for valid arguments.
1284 if (arg_len <= BUFLEN) {
1285 // Construct a string which consists only of the argument name without '+', '-', or '='.
1286 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1287 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1288 if (is_obsolete_flag(stripped_argname, &since)) {
1289 char version[256];
1290 since.to_string(version, sizeof(version));
1291 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1292 return true;
1293 }
1294 #ifndef PRODUCT
1295 else {
1296 const char* replacement;
1297 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1298 log_warning(arguments)("%s has been removed. Please use %s instead.",
1299 stripped_argname,
1300 replacement);
1301 return false;
1302 }
1303 }
1304 #endif //PRODUCT
1305 }
1306
1307 // For locked flags, report a custom error message if available.
1308 // Otherwise, report the standard unrecognized VM option.
1309 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1310 if (found_flag != NULL) {
1311 char locked_message_buf[BUFLEN];
1312 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1313 if (strlen(locked_message_buf) == 0) {
1314 if (found_flag->is_bool() && !has_plus_minus) {
1315 jio_fprintf(defaultStream::error_stream(),
1316 "Missing +/- setting for VM option '%s'\n", argname);
1317 } else if (!found_flag->is_bool() && has_plus_minus) {
1318 jio_fprintf(defaultStream::error_stream(),
1319 "Unexpected +/- setting in VM option '%s'\n", argname);
1320 } else {
1321 jio_fprintf(defaultStream::error_stream(),
1322 "Improperly specified VM option '%s'\n", argname);
1323 }
1324 } else {
1325 #ifdef PRODUCT
1326 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1327 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1328 if (ignore_unrecognized && mismatched) {
1329 return true;
1330 }
1331 #endif
1332 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1333 }
1334 } else {
1335 if (ignore_unrecognized) {
1336 return true;
1337 }
1338 jio_fprintf(defaultStream::error_stream(),
1339 "Unrecognized VM option '%s'\n", argname);
1340 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1341 if (fuzzy_matched != NULL) {
1342 jio_fprintf(defaultStream::error_stream(),
1343 "Did you mean '%s%s%s'? ",
1344 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1345 fuzzy_matched->_name,
1346 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1347 }
1348 }
1349
1350 // allow for commandline "commenting out" options like -XX:#+Verbose
1351 return arg[0] == '#';
1352 }
1353
1354 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1355 FILE* stream = fopen(file_name, "rb");
1356 if (stream == NULL) {
1357 if (should_exist) {
1358 jio_fprintf(defaultStream::error_stream(),
1359 "Could not open settings file %s\n", file_name);
1360 return false;
1361 } else {
1362 return true;
1363 }
1364 }
1365
1366 char token[1024];
1367 int pos = 0;
1368
1369 bool in_white_space = true;
1370 bool in_comment = false;
1371 bool in_quote = false;
1372 char quote_c = 0;
1373 bool result = true;
1374
1375 int c = getc(stream);
1376 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1377 if (in_white_space) {
1378 if (in_comment) {
1379 if (c == '\n') in_comment = false;
1380 } else {
1381 if (c == '#') in_comment = true;
1382 else if (!isspace(c)) {
1383 in_white_space = false;
1384 token[pos++] = c;
1385 }
1386 }
1387 } else {
1388 if (c == '\n' || (!in_quote && isspace(c))) {
1389 // token ends at newline, or at unquoted whitespace
1390 // this allows a way to include spaces in string-valued options
1391 token[pos] = '\0';
1392 logOption(token);
1393 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1394 build_jvm_flags(token);
1395 pos = 0;
1396 in_white_space = true;
1397 in_quote = false;
1398 } else if (!in_quote && (c == '\'' || c == '"')) {
1399 in_quote = true;
1400 quote_c = c;
1401 } else if (in_quote && (c == quote_c)) {
1402 in_quote = false;
1403 } else {
1404 token[pos++] = c;
1405 }
1406 }
1407 c = getc(stream);
1408 }
1409 if (pos > 0) {
1410 token[pos] = '\0';
1411 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1412 build_jvm_flags(token);
1413 }
1414 fclose(stream);
1415 return result;
1416 }
1417
1418 //=============================================================================================================
1419 // Parsing of properties (-D)
1420
1421 const char* Arguments::get_property(const char* key) {
1422 return PropertyList_get_value(system_properties(), key);
1423 }
1424
1425 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1426 const char* eq = strchr(prop, '=');
1427 const char* key;
1428 const char* value = "";
1429
1430 if (eq == NULL) {
1431 // property doesn't have a value, thus use passed string
1432 key = prop;
1433 } else {
1434 // property have a value, thus extract it and save to the
1435 // allocated string
1436 size_t key_len = eq - prop;
1437 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1438
1439 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1440 key = tmp_key;
1441
1442 value = &prop[key_len + 1];
1443 }
1444
1445 if (strcmp(key, "java.compiler") == 0) {
1446 process_java_compiler_argument(value);
1447 // Record value in Arguments, but let it get passed to Java.
1448 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1449 // sun.java.launcher.is_altjvm property is
1450 // private and is processed in process_sun_java_launcher_properties();
1451 // the sun.java.launcher property is passed on to the java application
1452 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1453 // append is true, writable is true, internal is false
1454 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1455 WriteableProperty, ExternalProperty);
1456 } else {
1457 if (strcmp(key, "sun.java.command") == 0) {
1458 char *old_java_command = _java_command;
1459 _java_command = os::strdup_check_oom(value, mtArguments);
1460 if (old_java_command != NULL) {
1461 os::free(old_java_command);
1462 }
1463 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1464 // If this property is set on the command line then its value will be
1465 // displayed in VM error logs as the URL at which to submit such logs.
1466 // Normally the URL displayed in error logs is different from the value
1467 // of this system property, so a different property should have been
1468 // used here, but we leave this as-is in case someone depends upon it.
1469 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1470 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1471 // its value without going through the property list or making a Java call.
1472 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1473 if (old_java_vendor_url_bug != NULL) {
1474 os::free((void *)old_java_vendor_url_bug);
1475 }
1476 }
1477
1478 // Create new property and add at the end of the list
1479 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1480 }
1481
1482 if (key != prop) {
1483 // SystemProperty copy passed value, thus free previously allocated
1484 // memory
1485 FreeHeap((void *)key);
1486 }
1487
1488 return true;
1489 }
1490
1491 #if INCLUDE_CDS
1492 const char* unsupported_properties[] = { "jdk.module.limitmods",
1493 "jdk.module.upgrade.path",
1494 "jdk.module.patch.0" };
1495 const char* unsupported_options[] = { "--limit-modules",
1496 "--upgrade-module-path",
1497 "--patch-module"
1498 };
1499 void Arguments::check_unsupported_dumping_properties() {
1500 assert(is_dumping_archive(),
1501 "this function is only used with CDS dump time");
1502 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1503 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1504 SystemProperty* sp = system_properties();
1505 while (sp != NULL) {
1506 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1507 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1508 vm_exit_during_initialization(
1509 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1510 }
1511 }
1512 sp = sp->next();
1513 }
1514
1515 // Check for an exploded module build in use with -Xshare:dump.
1516 if (!has_jimage()) {
1517 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1518 }
1519 }
1520
1521 bool Arguments::check_unsupported_cds_runtime_properties() {
1522 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1523 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1524 if (ArchiveClassesAtExit != NULL) {
1525 // dynamic dumping, just return false for now.
1526 // check_unsupported_dumping_properties() will be called later to check the same set of
1527 // properties, and will exit the VM with the correct error message if the unsupported properties
1528 // are used.
1529 return false;
1530 }
1531 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1532 if (get_property(unsupported_properties[i]) != NULL) {
1533 if (RequireSharedSpaces) {
1534 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1535 }
1536 return true;
1537 }
1538 }
1539 return false;
1540 }
1541 #endif
1542
1543 //===========================================================================================================
1544 // Setting int/mixed/comp mode flags
1545
1546 void Arguments::set_mode_flags(Mode mode) {
1547 // Set up default values for all flags.
1548 // If you add a flag to any of the branches below,
1549 // add a default value for it here.
1550 set_java_compiler(false);
1551 _mode = mode;
1552
1553 // Ensure Agent_OnLoad has the correct initial values.
1554 // This may not be the final mode; mode may change later in onload phase.
1555 PropertyList_unique_add(&_system_properties, "java.vm.info",
1556 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1557
1558 UseInterpreter = true;
1559 UseCompiler = true;
1560 UseLoopCounter = true;
1561
1562 // Default values may be platform/compiler dependent -
1563 // use the saved values
1564 ClipInlining = Arguments::_ClipInlining;
1565 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1566 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1567 BackgroundCompilation = Arguments::_BackgroundCompilation;
1568 if (TieredCompilation) {
1569 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1570 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1571 }
1572 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1573 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1574 }
1575 }
1576
1577 // Change from defaults based on mode
1578 switch (mode) {
1579 default:
1580 ShouldNotReachHere();
1581 break;
1582 case _int:
1583 UseCompiler = false;
1584 UseLoopCounter = false;
1585 AlwaysCompileLoopMethods = false;
1586 UseOnStackReplacement = false;
1587 break;
1588 case _mixed:
1589 // same as default
1590 break;
1591 case _comp:
1592 UseInterpreter = false;
1593 BackgroundCompilation = false;
1594 ClipInlining = false;
1595 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1596 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1597 // compile a level 4 (C2) and then continue executing it.
1598 if (TieredCompilation) {
1599 Tier3InvokeNotifyFreqLog = 0;
1600 Tier4InvocationThreshold = 0;
1601 }
1602 break;
1603 }
1604 }
1605
1606 // Conflict: required to use shared spaces (-Xshare:on), but
1607 // incompatible command line options were chosen.
1608 static void no_shared_spaces(const char* message) {
1609 if (RequireSharedSpaces) {
1610 jio_fprintf(defaultStream::error_stream(),
1611 "Class data sharing is inconsistent with other specified options.\n");
1612 vm_exit_during_initialization("Unable to use shared archive", message);
1613 } else {
1614 log_info(cds)("Unable to use shared archive: %s", message);
1615 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1616 }
1617 }
1618
1619 void set_object_alignment() {
1620 // Object alignment.
1621 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1622 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1623 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1624 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1625 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1626 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1627
1628 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1629 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1630
1631 // Oop encoding heap max
1632 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1633
1634 if (SurvivorAlignmentInBytes == 0) {
1635 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1636 }
1637 }
1638
1639 size_t Arguments::max_heap_for_compressed_oops() {
1640 // Avoid sign flip.
1641 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1642 // We need to fit both the NULL page and the heap into the memory budget, while
1643 // keeping alignment constraints of the heap. To guarantee the latter, as the
1644 // NULL page is located before the heap, we pad the NULL page to the conservative
1645 // maximum alignment that the GC may ever impose upon the heap.
1646 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1647 _conservative_max_heap_alignment);
1648
1649 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1650 NOT_LP64(ShouldNotReachHere(); return 0);
1651 }
1652
1653 void Arguments::set_use_compressed_oops() {
1654 #ifndef ZERO
1655 #ifdef _LP64
1656 // MaxHeapSize is not set up properly at this point, but
1657 // the only value that can override MaxHeapSize if we are
1658 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1659 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1660
1661 if (max_heap_size <= max_heap_for_compressed_oops()) {
1662 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1663 FLAG_SET_ERGO(UseCompressedOops, true);
1664 }
1665 } else {
1666 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1667 warning("Max heap size too large for Compressed Oops");
1668 FLAG_SET_DEFAULT(UseCompressedOops, false);
1669 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1670 }
1671 }
1672 #endif // _LP64
1673 #endif // ZERO
1674 }
1675
1676
1677 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1678 // set_use_compressed_oops().
1679 void Arguments::set_use_compressed_klass_ptrs() {
1680 #ifndef ZERO
1681 #ifdef _LP64
1682 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1683 if (!UseCompressedOops) {
1684 if (UseCompressedClassPointers) {
1685 warning("UseCompressedClassPointers requires UseCompressedOops");
1686 }
1687 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1688 } else {
1689 // Turn on UseCompressedClassPointers too
1690 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1691 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1692 }
1693 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1694 if (UseCompressedClassPointers) {
1695 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1696 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1697 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1698 }
1699 }
1700 }
1701 #endif // _LP64
1702 #endif // !ZERO
1703 }
1704
1705 void Arguments::set_conservative_max_heap_alignment() {
1706 // The conservative maximum required alignment for the heap is the maximum of
1707 // the alignments imposed by several sources: any requirements from the heap
1708 // itself and the maximum page size we may run the VM with.
1709 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1710 _conservative_max_heap_alignment = MAX4(heap_alignment,
1711 (size_t)os::vm_allocation_granularity(),
1712 os::max_page_size(),
1713 GCArguments::compute_heap_alignment());
1714 }
1715
1716 jint Arguments::set_ergonomics_flags() {
1717 GCConfig::initialize();
1718
1719 set_conservative_max_heap_alignment();
1720
1721 #ifndef ZERO
1722 #ifdef _LP64
1723 set_use_compressed_oops();
1724
1725 // set_use_compressed_klass_ptrs() must be called after calling
1726 // set_use_compressed_oops().
1727 set_use_compressed_klass_ptrs();
1728
1729 // Also checks that certain machines are slower with compressed oops
1730 // in vm_version initialization code.
1731 #endif // _LP64
1732 #endif // !ZERO
1733
1734 return JNI_OK;
1735 }
1736
1737 julong Arguments::limit_by_allocatable_memory(julong limit) {
1738 julong max_allocatable;
1739 julong result = limit;
1740 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1741 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1742 }
1743 return result;
1744 }
1745
1746 // Use static initialization to get the default before parsing
1747 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1748
1749 void Arguments::set_heap_size() {
1750 julong phys_mem;
1751
1752 // If the user specified one of these options, they
1753 // want specific memory sizing so do not limit memory
1754 // based on compressed oops addressability.
1755 // Also, memory limits will be calculated based on
1756 // available os physical memory, not our MaxRAM limit,
1757 // unless MaxRAM is also specified.
1758 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1759 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1760 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1761 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1762 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1763 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1764 !FLAG_IS_DEFAULT(MaxRAM));
1765 if (override_coop_limit) {
1766 if (FLAG_IS_DEFAULT(MaxRAM)) {
1767 phys_mem = os::physical_memory();
1768 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1769 } else {
1770 phys_mem = (julong)MaxRAM;
1771 }
1772 } else {
1773 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1774 : (julong)MaxRAM;
1775 }
1776
1777
1778 // Convert deprecated flags
1779 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1780 !FLAG_IS_DEFAULT(MaxRAMFraction))
1781 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1782
1783 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1784 !FLAG_IS_DEFAULT(MinRAMFraction))
1785 MinRAMPercentage = 100.0 / MinRAMFraction;
1786
1787 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1788 !FLAG_IS_DEFAULT(InitialRAMFraction))
1789 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1790
1791 // If the maximum heap size has not been set with -Xmx,
1792 // then set it as fraction of the size of physical memory,
1793 // respecting the maximum and minimum sizes of the heap.
1794 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1795 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1796 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1797 if (reasonable_min < MaxHeapSize) {
1798 // Small physical memory, so use a minimum fraction of it for the heap
1799 reasonable_max = reasonable_min;
1800 } else {
1801 // Not-small physical memory, so require a heap at least
1802 // as large as MaxHeapSize
1803 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1804 }
1805
1806 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1807 // Limit the heap size to ErgoHeapSizeLimit
1808 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1809 }
1810
1811 #ifdef _LP64
1812 if (UseCompressedOops) {
1813 // Limit the heap size to the maximum possible when using compressed oops
1814 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1815
1816 // HeapBaseMinAddress can be greater than default but not less than.
1817 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1818 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1819 // matches compressed oops printing flags
1820 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1821 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1822 DefaultHeapBaseMinAddress,
1823 DefaultHeapBaseMinAddress/G,
1824 HeapBaseMinAddress);
1825 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1826 }
1827 }
1828
1829 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1830 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1831 // but it should be not less than default MaxHeapSize.
1832 max_coop_heap -= HeapBaseMinAddress;
1833 }
1834
1835 // If user specified flags prioritizing os physical
1836 // memory limits, then disable compressed oops if
1837 // limits exceed max_coop_heap and UseCompressedOops
1838 // was not specified.
1839 if (reasonable_max > max_coop_heap) {
1840 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1841 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1842 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1843 "Please check the setting of MaxRAMPercentage %5.2f."
1844 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1845 FLAG_SET_ERGO(UseCompressedOops, false);
1846 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1847 } else {
1848 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1849 }
1850 }
1851 }
1852 #endif // _LP64
1853
1854 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1855
1856 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1857 // An initial heap size was specified on the command line,
1858 // so be sure that the maximum size is consistent. Done
1859 // after call to limit_by_allocatable_memory because that
1860 // method might reduce the allocation size.
1861 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1862 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1863 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1864 }
1865
1866 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1867 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1868 }
1869
1870 // If the minimum or initial heap_size have not been set or requested to be set
1871 // ergonomically, set them accordingly.
1872 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1873 julong reasonable_minimum = (julong)(OldSize + NewSize);
1874
1875 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1876
1877 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1878
1879 if (InitialHeapSize == 0) {
1880 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1881
1882 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1883 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1884
1885 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1886
1887 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1888 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1889 }
1890 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1891 // synchronize with InitialHeapSize to avoid errors with the default value.
1892 if (MinHeapSize == 0) {
1893 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1894 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1895 }
1896 }
1897 }
1898
1899 // This option inspects the machine and attempts to set various
1900 // parameters to be optimal for long-running, memory allocation
1901 // intensive jobs. It is intended for machines with large
1902 // amounts of cpu and memory.
1903 jint Arguments::set_aggressive_heap_flags() {
1904 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1905 // VM, but we may not be able to represent the total physical memory
1906 // available (like having 8gb of memory on a box but using a 32bit VM).
1907 // Thus, we need to make sure we're using a julong for intermediate
1908 // calculations.
1909 julong initHeapSize;
1910 julong total_memory = os::physical_memory();
1911
1912 if (total_memory < (julong) 256 * M) {
1913 jio_fprintf(defaultStream::error_stream(),
1914 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1915 vm_exit(1);
1916 }
1917
1918 // The heap size is half of available memory, or (at most)
1919 // all of possible memory less 160mb (leaving room for the OS
1920 // when using ISM). This is the maximum; because adaptive sizing
1921 // is turned on below, the actual space used may be smaller.
1922
1923 initHeapSize = MIN2(total_memory / (julong) 2,
1924 total_memory - (julong) 160 * M);
1925
1926 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1927
1928 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1929 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1930 return JNI_EINVAL;
1931 }
1932 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1933 return JNI_EINVAL;
1934 }
1935 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1936 return JNI_EINVAL;
1937 }
1938 }
1939 if (FLAG_IS_DEFAULT(NewSize)) {
1940 // Make the young generation 3/8ths of the total heap.
1941 if (FLAG_SET_CMDLINE(NewSize,
1942 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1943 return JNI_EINVAL;
1944 }
1945 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1946 return JNI_EINVAL;
1947 }
1948 }
1949
1950 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1951 FLAG_SET_DEFAULT(UseLargePages, true);
1952 #endif
1953
1954 // Increase some data structure sizes for efficiency
1955 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1956 return JNI_EINVAL;
1957 }
1958 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1959 return JNI_EINVAL;
1960 }
1961 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1962 return JNI_EINVAL;
1963 }
1964
1965 // See the OldPLABSize comment below, but replace 'after promotion'
1966 // with 'after copying'. YoungPLABSize is the size of the survivor
1967 // space per-gc-thread buffers. The default is 4kw.
1968 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1969 return JNI_EINVAL;
1970 }
1971
1972 // OldPLABSize is the size of the buffers in the old gen that
1973 // UseParallelGC uses to promote live data that doesn't fit in the
1974 // survivor spaces. At any given time, there's one for each gc thread.
1975 // The default size is 1kw. These buffers are rarely used, since the
1976 // survivor spaces are usually big enough. For specjbb, however, there
1977 // are occasions when there's lots of live data in the young gen
1978 // and we end up promoting some of it. We don't have a definite
1979 // explanation for why bumping OldPLABSize helps, but the theory
1980 // is that a bigger PLAB results in retaining something like the
1981 // original allocation order after promotion, which improves mutator
1982 // locality. A minor effect may be that larger PLABs reduce the
1983 // number of PLAB allocation events during gc. The value of 8kw
1984 // was arrived at by experimenting with specjbb.
1985 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1986 return JNI_EINVAL;
1987 }
1988
1989 // Enable parallel GC and adaptive generation sizing
1990 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1991 return JNI_EINVAL;
1992 }
1993
1994 // Encourage steady state memory management
1995 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1996 return JNI_EINVAL;
1997 }
1998
1999 // This appears to improve mutator locality
2000 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2001 return JNI_EINVAL;
2002 }
2003
2004 return JNI_OK;
2005 }
2006
2007 // This must be called after ergonomics.
2008 void Arguments::set_bytecode_flags() {
2009 if (!RewriteBytecodes) {
2010 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2011 }
2012 }
2013
2014 // Aggressive optimization flags
2015 jint Arguments::set_aggressive_opts_flags() {
2016 #ifdef COMPILER2
2017 if (AggressiveUnboxing) {
2018 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2019 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2020 } else if (!EliminateAutoBox) {
2021 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2022 AggressiveUnboxing = false;
2023 }
2024 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2025 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2026 } else if (!DoEscapeAnalysis) {
2027 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2028 AggressiveUnboxing = false;
2029 }
2030 }
2031 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2032 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2033 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2034 }
2035 // Feed the cache size setting into the JDK
2036 char buffer[1024];
2037 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2038 if (!add_property(buffer)) {
2039 return JNI_ENOMEM;
2040 }
2041 }
2042 #endif
2043
2044 return JNI_OK;
2045 }
2046
2047 //===========================================================================================================
2048 // Parsing of java.compiler property
2049
2050 void Arguments::process_java_compiler_argument(const char* arg) {
2051 // For backwards compatibility, Djava.compiler=NONE or ""
2052 // causes us to switch to -Xint mode UNLESS -Xdebug
2053 // is also specified.
2054 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2055 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2056 }
2057 }
2058
2059 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2060 _sun_java_launcher = os::strdup_check_oom(launcher);
2061 }
2062
2063 bool Arguments::created_by_java_launcher() {
2064 assert(_sun_java_launcher != NULL, "property must have value");
2065 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2066 }
2067
2068 bool Arguments::sun_java_launcher_is_altjvm() {
2069 return _sun_java_launcher_is_altjvm;
2070 }
2071
2072 //===========================================================================================================
2073 // Parsing of main arguments
2074
2075 unsigned int addreads_count = 0;
2076 unsigned int addexports_count = 0;
2077 unsigned int addopens_count = 0;
2078 unsigned int addmods_count = 0;
2079 unsigned int patch_mod_count = 0;
2080
2081 // Check the consistency of vm_init_args
2082 bool Arguments::check_vm_args_consistency() {
2083 // Method for adding checks for flag consistency.
2084 // The intent is to warn the user of all possible conflicts,
2085 // before returning an error.
2086 // Note: Needs platform-dependent factoring.
2087 bool status = true;
2088
2089 if (TLABRefillWasteFraction == 0) {
2090 jio_fprintf(defaultStream::error_stream(),
2091 "TLABRefillWasteFraction should be a denominator, "
2092 "not " SIZE_FORMAT "\n",
2093 TLABRefillWasteFraction);
2094 status = false;
2095 }
2096
2097 if (PrintNMTStatistics) {
2098 #if INCLUDE_NMT
2099 if (MemTracker::tracking_level() == NMT_off) {
2100 #endif // INCLUDE_NMT
2101 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2102 PrintNMTStatistics = false;
2103 #if INCLUDE_NMT
2104 }
2105 #endif
2106 }
2107
2108 status = CompilerConfig::check_args_consistency(status);
2109 #if INCLUDE_JVMCI
2110 if (status && EnableJVMCI) {
2111 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2112 AddProperty, UnwriteableProperty, InternalProperty);
2113 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2114 return false;
2115 }
2116 }
2117 #endif
2118
2119 #ifndef SUPPORT_RESERVED_STACK_AREA
2120 if (StackReservedPages != 0) {
2121 FLAG_SET_CMDLINE(StackReservedPages, 0);
2122 warning("Reserved Stack Area not supported on this platform");
2123 }
2124 #endif
2125
2126 status = status && GCArguments::check_args_consistency();
2127
2128 return status;
2129 }
2130
2131 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2132 const char* option_type) {
2133 if (ignore) return false;
2134
2135 const char* spacer = " ";
2136 if (option_type == NULL) {
2137 option_type = ++spacer; // Set both to the empty string.
2138 }
2139
2140 jio_fprintf(defaultStream::error_stream(),
2141 "Unrecognized %s%soption: %s\n", option_type, spacer,
2142 option->optionString);
2143 return true;
2144 }
2145
2146 static const char* user_assertion_options[] = {
2147 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2148 };
2149
2150 static const char* system_assertion_options[] = {
2151 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2152 };
2153
2154 bool Arguments::parse_uintx(const char* value,
2155 uintx* uintx_arg,
2156 uintx min_size) {
2157
2158 // Check the sign first since atojulong() parses only unsigned values.
2159 bool value_is_positive = !(*value == '-');
2160
2161 if (value_is_positive) {
2162 julong n;
2163 bool good_return = atojulong(value, &n);
2164 if (good_return) {
2165 bool above_minimum = n >= min_size;
2166 bool value_is_too_large = n > max_uintx;
2167
2168 if (above_minimum && !value_is_too_large) {
2169 *uintx_arg = n;
2170 return true;
2171 }
2172 }
2173 }
2174 return false;
2175 }
2176
2177 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2178 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2179 char* property = AllocateHeap(prop_len, mtArguments);
2180 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2181 if (ret < 0 || ret >= (int)prop_len) {
2182 FreeHeap(property);
2183 return false;
2184 }
2185 bool added = add_property(property, UnwriteableProperty, internal);
2186 FreeHeap(property);
2187 return added;
2188 }
2189
2190 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2191 const unsigned int props_count_limit = 1000;
2192 const int max_digits = 3;
2193 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2194
2195 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2196 if (count < props_count_limit) {
2197 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2198 char* property = AllocateHeap(prop_len, mtArguments);
2199 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2200 if (ret < 0 || ret >= (int)prop_len) {
2201 FreeHeap(property);
2202 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2203 return false;
2204 }
2205 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2206 FreeHeap(property);
2207 return added;
2208 }
2209
2210 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2211 return false;
2212 }
2213
2214 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2215 julong* long_arg,
2216 julong min_size,
2217 julong max_size) {
2218 if (!atojulong(s, long_arg)) return arg_unreadable;
2219 return check_memory_size(*long_arg, min_size, max_size);
2220 }
2221
2222 // Parse JavaVMInitArgs structure
2223
2224 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2225 const JavaVMInitArgs *java_tool_options_args,
2226 const JavaVMInitArgs *java_options_args,
2227 const JavaVMInitArgs *cmd_line_args) {
2228 bool patch_mod_javabase = false;
2229
2230 // Save default settings for some mode flags
2231 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2232 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2233 Arguments::_ClipInlining = ClipInlining;
2234 Arguments::_BackgroundCompilation = BackgroundCompilation;
2235 if (TieredCompilation) {
2236 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2237 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2238 }
2239
2240 // Remember the default value of SharedBaseAddress.
2241 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2242
2243 // Setup flags for mixed which is the default
2244 set_mode_flags(_mixed);
2245
2246 // Parse args structure generated from java.base vm options resource
2247 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2248 if (result != JNI_OK) {
2249 return result;
2250 }
2251
2252 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2253 // variable (if present).
2254 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2255 if (result != JNI_OK) {
2256 return result;
2257 }
2258
2259 // Parse args structure generated from the command line flags.
2260 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2261 if (result != JNI_OK) {
2262 return result;
2263 }
2264
2265 // Parse args structure generated from the _JAVA_OPTIONS environment
2266 // variable (if present) (mimics classic VM)
2267 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2268 if (result != JNI_OK) {
2269 return result;
2270 }
2271
2272 // We need to ensure processor and memory resources have been properly
2273 // configured - which may rely on arguments we just processed - before
2274 // doing the final argument processing. Any argument processing that
2275 // needs to know about processor and memory resources must occur after
2276 // this point.
2277
2278 os::init_container_support();
2279
2280 // Do final processing now that all arguments have been parsed
2281 result = finalize_vm_init_args(patch_mod_javabase);
2282 if (result != JNI_OK) {
2283 return result;
2284 }
2285
2286 return JNI_OK;
2287 }
2288
2289 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2290 // represents a valid JDWP agent. is_path==true denotes that we
2291 // are dealing with -agentpath (case where name is a path), otherwise with
2292 // -agentlib
2293 bool valid_jdwp_agent(char *name, bool is_path) {
2294 char *_name;
2295 const char *_jdwp = "jdwp";
2296 size_t _len_jdwp, _len_prefix;
2297
2298 if (is_path) {
2299 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2300 return false;
2301 }
2302
2303 _name++; // skip past last path separator
2304 _len_prefix = strlen(JNI_LIB_PREFIX);
2305
2306 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2307 return false;
2308 }
2309
2310 _name += _len_prefix;
2311 _len_jdwp = strlen(_jdwp);
2312
2313 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2314 _name += _len_jdwp;
2315 }
2316 else {
2317 return false;
2318 }
2319
2320 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2321 return false;
2322 }
2323
2324 return true;
2325 }
2326
2327 if (strcmp(name, _jdwp) == 0) {
2328 return true;
2329 }
2330
2331 return false;
2332 }
2333
2334 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2335 // --patch-module=<module>=<file>(<pathsep><file>)*
2336 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2337 // Find the equal sign between the module name and the path specification
2338 const char* module_equal = strchr(patch_mod_tail, '=');
2339 if (module_equal == NULL) {
2340 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2341 return JNI_ERR;
2342 } else {
2343 // Pick out the module name
2344 size_t module_len = module_equal - patch_mod_tail;
2345 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2346 if (module_name != NULL) {
2347 memcpy(module_name, patch_mod_tail, module_len);
2348 *(module_name + module_len) = '\0';
2349 // The path piece begins one past the module_equal sign
2350 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2351 FREE_C_HEAP_ARRAY(char, module_name);
2352 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2353 return JNI_ENOMEM;
2354 }
2355 } else {
2356 return JNI_ENOMEM;
2357 }
2358 }
2359 return JNI_OK;
2360 }
2361
2362 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2363 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2364 // The min and max sizes match the values in globals.hpp, but scaled
2365 // with K. The values have been chosen so that alignment with page
2366 // size doesn't change the max value, which makes the conversions
2367 // back and forth between Xss value and ThreadStackSize value easier.
2368 // The values have also been chosen to fit inside a 32-bit signed type.
2369 const julong min_ThreadStackSize = 0;
2370 const julong max_ThreadStackSize = 1 * M;
2371
2372 const julong min_size = min_ThreadStackSize * K;
2373 const julong max_size = max_ThreadStackSize * K;
2374
2375 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2376
2377 julong size = 0;
2378 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2379 if (errcode != arg_in_range) {
2380 bool silent = (option == NULL); // Allow testing to silence error messages
2381 if (!silent) {
2382 jio_fprintf(defaultStream::error_stream(),
2383 "Invalid thread stack size: %s\n", option->optionString);
2384 describe_range_error(errcode);
2385 }
2386 return JNI_EINVAL;
2387 }
2388
2389 // Internally track ThreadStackSize in units of 1024 bytes.
2390 const julong size_aligned = align_up(size, K);
2391 assert(size <= size_aligned,
2392 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2393 size, size_aligned);
2394
2395 const julong size_in_K = size_aligned / K;
2396 assert(size_in_K < (julong)max_intx,
2397 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2398 size_in_K);
2399
2400 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2401 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2402 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2403 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2404 max_expanded, size_in_K);
2405
2406 *out_ThreadStackSize = (intx)size_in_K;
2407
2408 return JNI_OK;
2409 }
2410
2411 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2412 // For match_option to return remaining or value part of option string
2413 const char* tail;
2414
2415 // iterate over arguments
2416 for (int index = 0; index < args->nOptions; index++) {
2417 bool is_absolute_path = false; // for -agentpath vs -agentlib
2418
2419 const JavaVMOption* option = args->options + index;
2420
2421 if (!match_option(option, "-Djava.class.path", &tail) &&
2422 !match_option(option, "-Dsun.java.command", &tail) &&
2423 !match_option(option, "-Dsun.java.launcher", &tail)) {
2424
2425 // add all jvm options to the jvm_args string. This string
2426 // is used later to set the java.vm.args PerfData string constant.
2427 // the -Djava.class.path and the -Dsun.java.command options are
2428 // omitted from jvm_args string as each have their own PerfData
2429 // string constant object.
2430 build_jvm_args(option->optionString);
2431 }
2432
2433 // -verbose:[class/module/gc/jni]
2434 if (match_option(option, "-verbose", &tail)) {
2435 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2436 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2437 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2438 } else if (!strcmp(tail, ":module")) {
2439 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2440 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2441 } else if (!strcmp(tail, ":gc")) {
2442 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2443 } else if (!strcmp(tail, ":jni")) {
2444 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2445 }
2446 // -da / -ea / -disableassertions / -enableassertions
2447 // These accept an optional class/package name separated by a colon, e.g.,
2448 // -da:java.lang.Thread.
2449 } else if (match_option(option, user_assertion_options, &tail, true)) {
2450 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2451 if (*tail == '\0') {
2452 JavaAssertions::setUserClassDefault(enable);
2453 } else {
2454 assert(*tail == ':', "bogus match by match_option()");
2455 JavaAssertions::addOption(tail + 1, enable);
2456 }
2457 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2458 } else if (match_option(option, system_assertion_options, &tail, false)) {
2459 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2460 JavaAssertions::setSystemClassDefault(enable);
2461 // -bootclasspath:
2462 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2463 jio_fprintf(defaultStream::output_stream(),
2464 "-Xbootclasspath is no longer a supported option.\n");
2465 return JNI_EINVAL;
2466 // -bootclasspath/a:
2467 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2468 Arguments::append_sysclasspath(tail);
2469 // -bootclasspath/p:
2470 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2471 jio_fprintf(defaultStream::output_stream(),
2472 "-Xbootclasspath/p is no longer a supported option.\n");
2473 return JNI_EINVAL;
2474 // -Xrun
2475 } else if (match_option(option, "-Xrun", &tail)) {
2476 if (tail != NULL) {
2477 const char* pos = strchr(tail, ':');
2478 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2479 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2480 jio_snprintf(name, len + 1, "%s", tail);
2481
2482 char *options = NULL;
2483 if(pos != NULL) {
2484 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2485 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2486 }
2487 #if !INCLUDE_JVMTI
2488 if (strcmp(name, "jdwp") == 0) {
2489 jio_fprintf(defaultStream::error_stream(),
2490 "Debugging agents are not supported in this VM\n");
2491 return JNI_ERR;
2492 }
2493 #endif // !INCLUDE_JVMTI
2494 add_init_library(name, options);
2495 }
2496 } else if (match_option(option, "--add-reads=", &tail)) {
2497 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2498 return JNI_ENOMEM;
2499 }
2500 } else if (match_option(option, "--add-exports=", &tail)) {
2501 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2502 return JNI_ENOMEM;
2503 }
2504 } else if (match_option(option, "--add-opens=", &tail)) {
2505 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2506 return JNI_ENOMEM;
2507 }
2508 } else if (match_option(option, "--add-modules=", &tail)) {
2509 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2510 return JNI_ENOMEM;
2511 }
2512 } else if (match_option(option, "--limit-modules=", &tail)) {
2513 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2514 return JNI_ENOMEM;
2515 }
2516 } else if (match_option(option, "--module-path=", &tail)) {
2517 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2518 return JNI_ENOMEM;
2519 }
2520 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2521 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2522 return JNI_ENOMEM;
2523 }
2524 } else if (match_option(option, "--patch-module=", &tail)) {
2525 // --patch-module=<module>=<file>(<pathsep><file>)*
2526 int res = process_patch_mod_option(tail, patch_mod_javabase);
2527 if (res != JNI_OK) {
2528 return res;
2529 }
2530 } else if (match_option(option, "--illegal-access=", &tail)) {
2531 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2532 return JNI_ENOMEM;
2533 }
2534 // -agentlib and -agentpath
2535 } else if (match_option(option, "-agentlib:", &tail) ||
2536 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2537 if(tail != NULL) {
2538 const char* pos = strchr(tail, '=');
2539 char* name;
2540 if (pos == NULL) {
2541 name = os::strdup_check_oom(tail, mtArguments);
2542 } else {
2543 size_t len = pos - tail;
2544 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2545 memcpy(name, tail, len);
2546 name[len] = '\0';
2547 }
2548
2549 char *options = NULL;
2550 if(pos != NULL) {
2551 options = os::strdup_check_oom(pos + 1, mtArguments);
2552 }
2553 #if !INCLUDE_JVMTI
2554 if (valid_jdwp_agent(name, is_absolute_path)) {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Debugging agents are not supported in this VM\n");
2557 return JNI_ERR;
2558 }
2559 #endif // !INCLUDE_JVMTI
2560 add_init_agent(name, options, is_absolute_path);
2561 }
2562 // -javaagent
2563 } else if (match_option(option, "-javaagent:", &tail)) {
2564 #if !INCLUDE_JVMTI
2565 jio_fprintf(defaultStream::error_stream(),
2566 "Instrumentation agents are not supported in this VM\n");
2567 return JNI_ERR;
2568 #else
2569 if (tail != NULL) {
2570 size_t length = strlen(tail) + 1;
2571 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2572 jio_snprintf(options, length, "%s", tail);
2573 add_instrument_agent("instrument", options, false);
2574 // java agents need module java.instrument
2575 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2576 return JNI_ENOMEM;
2577 }
2578 }
2579 #endif // !INCLUDE_JVMTI
2580 // --enable_preview
2581 } else if (match_option(option, "--enable-preview")) {
2582 set_enable_preview();
2583 // -Xnoclassgc
2584 } else if (match_option(option, "-Xnoclassgc")) {
2585 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2586 return JNI_EINVAL;
2587 }
2588 // -Xbatch
2589 } else if (match_option(option, "-Xbatch")) {
2590 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2591 return JNI_EINVAL;
2592 }
2593 // -Xmn for compatibility with other JVM vendors
2594 } else if (match_option(option, "-Xmn", &tail)) {
2595 julong long_initial_young_size = 0;
2596 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2597 if (errcode != arg_in_range) {
2598 jio_fprintf(defaultStream::error_stream(),
2599 "Invalid initial young generation size: %s\n", option->optionString);
2600 describe_range_error(errcode);
2601 return JNI_EINVAL;
2602 }
2603 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2604 return JNI_EINVAL;
2605 }
2606 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2607 return JNI_EINVAL;
2608 }
2609 // -Xms
2610 } else if (match_option(option, "-Xms", &tail)) {
2611 julong size = 0;
2612 // an initial heap size of 0 means automatically determine
2613 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2614 if (errcode != arg_in_range) {
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Invalid initial heap size: %s\n", option->optionString);
2617 describe_range_error(errcode);
2618 return JNI_EINVAL;
2619 }
2620 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2621 return JNI_EINVAL;
2622 }
2623 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2624 return JNI_EINVAL;
2625 }
2626 // -Xmx
2627 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2628 julong long_max_heap_size = 0;
2629 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2630 if (errcode != arg_in_range) {
2631 jio_fprintf(defaultStream::error_stream(),
2632 "Invalid maximum heap size: %s\n", option->optionString);
2633 describe_range_error(errcode);
2634 return JNI_EINVAL;
2635 }
2636 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2637 return JNI_EINVAL;
2638 }
2639 // Xmaxf
2640 } else if (match_option(option, "-Xmaxf", &tail)) {
2641 char* err;
2642 int maxf = (int)(strtod(tail, &err) * 100);
2643 if (*err != '\0' || *tail == '\0') {
2644 jio_fprintf(defaultStream::error_stream(),
2645 "Bad max heap free percentage size: %s\n",
2646 option->optionString);
2647 return JNI_EINVAL;
2648 } else {
2649 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 }
2653 // Xminf
2654 } else if (match_option(option, "-Xminf", &tail)) {
2655 char* err;
2656 int minf = (int)(strtod(tail, &err) * 100);
2657 if (*err != '\0' || *tail == '\0') {
2658 jio_fprintf(defaultStream::error_stream(),
2659 "Bad min heap free percentage size: %s\n",
2660 option->optionString);
2661 return JNI_EINVAL;
2662 } else {
2663 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 }
2667 // -Xss
2668 } else if (match_option(option, "-Xss", &tail)) {
2669 intx value = 0;
2670 jint err = parse_xss(option, tail, &value);
2671 if (err != JNI_OK) {
2672 return err;
2673 }
2674 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2675 return JNI_EINVAL;
2676 }
2677 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2678 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2679 julong long_ReservedCodeCacheSize = 0;
2680
2681 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2682 if (errcode != arg_in_range) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid maximum code cache size: %s.\n", option->optionString);
2685 return JNI_EINVAL;
2686 }
2687 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2688 return JNI_EINVAL;
2689 }
2690 // -green
2691 } else if (match_option(option, "-green")) {
2692 jio_fprintf(defaultStream::error_stream(),
2693 "Green threads support not available\n");
2694 return JNI_EINVAL;
2695 // -native
2696 } else if (match_option(option, "-native")) {
2697 // HotSpot always uses native threads, ignore silently for compatibility
2698 // -Xrs
2699 } else if (match_option(option, "-Xrs")) {
2700 // Classic/EVM option, new functionality
2701 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 // -Xprof
2705 } else if (match_option(option, "-Xprof")) {
2706 char version[256];
2707 // Obsolete in JDK 10
2708 JDK_Version::jdk(10).to_string(version, sizeof(version));
2709 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2710 // -Xinternalversion
2711 } else if (match_option(option, "-Xinternalversion")) {
2712 jio_fprintf(defaultStream::output_stream(), "%s\n",
2713 VM_Version::internal_vm_info_string());
2714 vm_exit(0);
2715 #ifndef PRODUCT
2716 // -Xprintflags
2717 } else if (match_option(option, "-Xprintflags")) {
2718 JVMFlag::printFlags(tty, false);
2719 vm_exit(0);
2720 #endif
2721 // -D
2722 } else if (match_option(option, "-D", &tail)) {
2723 const char* value;
2724 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2725 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2726 // abort if -Djava.endorsed.dirs is set
2727 jio_fprintf(defaultStream::output_stream(),
2728 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2729 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2730 return JNI_EINVAL;
2731 }
2732 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2733 *value != '\0' && strcmp(value, "\"\"") != 0) {
2734 // abort if -Djava.ext.dirs is set
2735 jio_fprintf(defaultStream::output_stream(),
2736 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2737 return JNI_EINVAL;
2738 }
2739 // Check for module related properties. They must be set using the modules
2740 // options. For example: use "--add-modules=java.sql", not
2741 // "-Djdk.module.addmods=java.sql"
2742 if (is_internal_module_property(option->optionString + 2)) {
2743 needs_module_property_warning = true;
2744 continue;
2745 }
2746 if (!add_property(tail)) {
2747 return JNI_ENOMEM;
2748 }
2749 // Out of the box management support
2750 if (match_option(option, "-Dcom.sun.management", &tail)) {
2751 #if INCLUDE_MANAGEMENT
2752 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 // management agent in module jdk.management.agent
2756 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2757 return JNI_ENOMEM;
2758 }
2759 #else
2760 jio_fprintf(defaultStream::output_stream(),
2761 "-Dcom.sun.management is not supported in this VM.\n");
2762 return JNI_ERR;
2763 #endif
2764 }
2765 // -Xint
2766 } else if (match_option(option, "-Xint")) {
2767 set_mode_flags(_int);
2768 // -Xmixed
2769 } else if (match_option(option, "-Xmixed")) {
2770 set_mode_flags(_mixed);
2771 // -Xcomp
2772 } else if (match_option(option, "-Xcomp")) {
2773 // for testing the compiler; turn off all flags that inhibit compilation
2774 set_mode_flags(_comp);
2775 // -Xshare:dump
2776 } else if (match_option(option, "-Xshare:dump")) {
2777 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 // -Xshare:on
2781 } else if (match_option(option, "-Xshare:on")) {
2782 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2786 return JNI_EINVAL;
2787 }
2788 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2789 } else if (match_option(option, "-Xshare:auto")) {
2790 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2794 return JNI_EINVAL;
2795 }
2796 // -Xshare:off
2797 } else if (match_option(option, "-Xshare:off")) {
2798 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2799 return JNI_EINVAL;
2800 }
2801 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 // -Xverify
2805 } else if (match_option(option, "-Xverify", &tail)) {
2806 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2807 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2808 return JNI_EINVAL;
2809 }
2810 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2811 return JNI_EINVAL;
2812 }
2813 } else if (strcmp(tail, ":remote") == 0) {
2814 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2818 return JNI_EINVAL;
2819 }
2820 } else if (strcmp(tail, ":none") == 0) {
2821 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2822 return JNI_EINVAL;
2823 }
2824 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2825 return JNI_EINVAL;
2826 }
2827 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2828 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2829 return JNI_EINVAL;
2830 }
2831 // -Xdebug
2832 } else if (match_option(option, "-Xdebug")) {
2833 // note this flag has been used, then ignore
2834 set_xdebug_mode(true);
2835 // -Xnoagent
2836 } else if (match_option(option, "-Xnoagent")) {
2837 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2838 } else if (match_option(option, "-Xloggc:", &tail)) {
2839 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2840 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2841 _gc_log_filename = os::strdup_check_oom(tail);
2842 } else if (match_option(option, "-Xlog", &tail)) {
2843 bool ret = false;
2844 if (strcmp(tail, ":help") == 0) {
2845 fileStream stream(defaultStream::output_stream());
2846 LogConfiguration::print_command_line_help(&stream);
2847 vm_exit(0);
2848 } else if (strcmp(tail, ":disable") == 0) {
2849 LogConfiguration::disable_logging();
2850 ret = true;
2851 } else if (*tail == '\0') {
2852 ret = LogConfiguration::parse_command_line_arguments();
2853 assert(ret, "-Xlog without arguments should never fail to parse");
2854 } else if (*tail == ':') {
2855 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2856 }
2857 if (ret == false) {
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2860 tail);
2861 return JNI_EINVAL;
2862 }
2863 // JNI hooks
2864 } else if (match_option(option, "-Xcheck", &tail)) {
2865 if (!strcmp(tail, ":jni")) {
2866 #if !INCLUDE_JNI_CHECK
2867 warning("JNI CHECKING is not supported in this VM");
2868 #else
2869 CheckJNICalls = true;
2870 #endif // INCLUDE_JNI_CHECK
2871 } else if (is_bad_option(option, args->ignoreUnrecognized,
2872 "check")) {
2873 return JNI_EINVAL;
2874 }
2875 } else if (match_option(option, "vfprintf")) {
2876 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2877 } else if (match_option(option, "exit")) {
2878 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2879 } else if (match_option(option, "abort")) {
2880 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2881 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2882 // and the last option wins.
2883 } else if (match_option(option, "-XX:+NeverTenure")) {
2884 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2894 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2895 return JNI_EINVAL;
2896 }
2897 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2898 return JNI_EINVAL;
2899 }
2900 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2904 uintx max_tenuring_thresh = 0;
2905 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2906 jio_fprintf(defaultStream::error_stream(),
2907 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2908 return JNI_EINVAL;
2909 }
2910
2911 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914
2915 if (MaxTenuringThreshold == 0) {
2916 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 } else {
2923 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 }
2930 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2931 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2938 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2939 return JNI_EINVAL;
2940 }
2941 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2942 return JNI_EINVAL;
2943 }
2944 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2945 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2952 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2953 return JNI_EINVAL;
2954 }
2955 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2959 #if defined(DTRACE_ENABLED)
2960 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 #else // defined(DTRACE_ENABLED)
2973 jio_fprintf(defaultStream::error_stream(),
2974 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2975 return JNI_EINVAL;
2976 #endif // defined(DTRACE_ENABLED)
2977 #ifdef ASSERT
2978 } else if (match_option(option, "-XX:+FullGCALot")) {
2979 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2980 return JNI_EINVAL;
2981 }
2982 // disable scavenge before parallel mark-compact
2983 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 #endif
2987 #if !INCLUDE_MANAGEMENT
2988 } else if (match_option(option, "-XX:+ManagementServer")) {
2989 jio_fprintf(defaultStream::error_stream(),
2990 "ManagementServer is not supported in this VM.\n");
2991 return JNI_ERR;
2992 #endif // INCLUDE_MANAGEMENT
2993 #if INCLUDE_JVMCI
2994 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2995 if (EnableJVMCIProduct) {
2996 jio_fprintf(defaultStream::error_stream(),
2997 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2998 return JNI_EINVAL;
2999 }
3000 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
3001 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
3002 // Allow this flag if it has been unlocked.
3003 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
3004 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
3005 jio_fprintf(defaultStream::error_stream(),
3006 "Unable to enable JVMCI in product mode");
3007 return JNI_ERR;
3008 }
3009 }
3010 // The flag was locked so process normally to report that error
3011 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3012 return JNI_EINVAL;
3013 }
3014 #endif // INCLUDE_JVMCI
3015 #if INCLUDE_JFR
3016 } else if (match_jfr_option(&option)) {
3017 return JNI_EINVAL;
3018 #endif
3019 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3020 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3021 // already been handled
3022 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3023 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3024 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3025 return JNI_EINVAL;
3026 }
3027 }
3028 // Unknown option
3029 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3030 return JNI_ERR;
3031 }
3032 }
3033
3034 // PrintSharedArchiveAndExit will turn on
3035 // -Xshare:on
3036 // -Xlog:class+path=info
3037 if (PrintSharedArchiveAndExit) {
3038 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3042 return JNI_EINVAL;
3043 }
3044 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3045 }
3046
3047 fix_appclasspath();
3048
3049 return JNI_OK;
3050 }
3051
3052 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3053 // For java.base check for duplicate --patch-module options being specified on the command line.
3054 // This check is only required for java.base, all other duplicate module specifications
3055 // will be checked during module system initialization. The module system initialization
3056 // will throw an ExceptionInInitializerError if this situation occurs.
3057 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3058 if (*patch_mod_javabase) {
3059 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3060 } else {
3061 *patch_mod_javabase = true;
3062 }
3063 }
3064
3065 // Create GrowableArray lazily, only if --patch-module has been specified
3066 if (_patch_mod_prefix == NULL) {
3067 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3068 }
3069
3070 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3071 }
3072
3073 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3074 //
3075 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3076 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3077 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3078 // path is treated as the current directory.
3079 //
3080 // This causes problems with CDS, which requires that all directories specified in the classpath
3081 // must be empty. In most cases, applications do NOT want to load classes from the current
3082 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3083 // scripts compatible with CDS.
3084 void Arguments::fix_appclasspath() {
3085 if (IgnoreEmptyClassPaths) {
3086 const char separator = *os::path_separator();
3087 const char* src = _java_class_path->value();
3088
3089 // skip over all the leading empty paths
3090 while (*src == separator) {
3091 src ++;
3092 }
3093
3094 char* copy = os::strdup_check_oom(src, mtArguments);
3095
3096 // trim all trailing empty paths
3097 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3098 *tail = '\0';
3099 }
3100
3101 char from[3] = {separator, separator, '\0'};
3102 char to [2] = {separator, '\0'};
3103 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3104 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3105 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3106 }
3107
3108 _java_class_path->set_writeable_value(copy);
3109 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3110 }
3111 }
3112
3113 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3114 // check if the default lib/endorsed directory exists; if so, error
3115 char path[JVM_MAXPATHLEN];
3116 const char* fileSep = os::file_separator();
3117 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3118
3119 DIR* dir = os::opendir(path);
3120 if (dir != NULL) {
3121 jio_fprintf(defaultStream::output_stream(),
3122 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3123 "in modular form will be supported via the concept of upgradeable modules.\n");
3124 os::closedir(dir);
3125 return JNI_ERR;
3126 }
3127
3128 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3129 dir = os::opendir(path);
3130 if (dir != NULL) {
3131 jio_fprintf(defaultStream::output_stream(),
3132 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3133 "Use -classpath instead.\n.");
3134 os::closedir(dir);
3135 return JNI_ERR;
3136 }
3137
3138 // This must be done after all arguments have been processed
3139 // and the container support has been initialized since AggressiveHeap
3140 // relies on the amount of total memory available.
3141 if (AggressiveHeap) {
3142 jint result = set_aggressive_heap_flags();
3143 if (result != JNI_OK) {
3144 return result;
3145 }
3146 }
3147
3148 // This must be done after all arguments have been processed.
3149 // java_compiler() true means set to "NONE" or empty.
3150 if (java_compiler() && !xdebug_mode()) {
3151 // For backwards compatibility, we switch to interpreted mode if
3152 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3153 // not specified.
3154 set_mode_flags(_int);
3155 }
3156
3157 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3158 // but like -Xint, leave compilation thresholds unaffected.
3159 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3160 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3161 set_mode_flags(_int);
3162 }
3163
3164 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3165 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3166 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3167 }
3168
3169 #if !COMPILER2_OR_JVMCI
3170 // Don't degrade server performance for footprint
3171 if (FLAG_IS_DEFAULT(UseLargePages) &&
3172 MaxHeapSize < LargePageHeapSizeThreshold) {
3173 // No need for large granularity pages w/small heaps.
3174 // Note that large pages are enabled/disabled for both the
3175 // Java heap and the code cache.
3176 FLAG_SET_DEFAULT(UseLargePages, false);
3177 }
3178
3179 UNSUPPORTED_OPTION(ProfileInterpreter);
3180 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3181 #endif
3182
3183
3184 #ifdef TIERED
3185 // Parse the CompilationMode flag
3186 if (!CompilationModeFlag::initialize()) {
3187 return JNI_ERR;
3188 }
3189 #else
3190 // Tiered compilation is undefined.
3191 UNSUPPORTED_OPTION(TieredCompilation);
3192 #endif
3193
3194 if (!check_vm_args_consistency()) {
3195 return JNI_ERR;
3196 }
3197
3198 #if INCLUDE_CDS
3199 if (DumpSharedSpaces) {
3200 // Disable biased locking now as it interferes with the clean up of
3201 // the archived Klasses and Java string objects (at dump time only).
3202 UseBiasedLocking = false;
3203
3204 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3205 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3206 // compiler just to be safe.
3207 //
3208 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3209 // instead of modifying them in place. The copy is inaccessible to the compiler.
3210 // TODO: revisit the following for the static archive case.
3211 set_mode_flags(_int);
3212 }
3213 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3214 // Always verify non-system classes during CDS dump
3215 if (!BytecodeVerificationRemote) {
3216 BytecodeVerificationRemote = true;
3217 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3218 }
3219 }
3220 if (ArchiveClassesAtExit == NULL) {
3221 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3222 }
3223 if (UseSharedSpaces && patch_mod_javabase) {
3224 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3225 }
3226 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3227 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3228 }
3229 #endif
3230
3231 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3232 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3233 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3234
3235 return JNI_OK;
3236 }
3237
3238 // Helper class for controlling the lifetime of JavaVMInitArgs
3239 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3240 // deleted on the destruction of the ScopedVMInitArgs object.
3241 class ScopedVMInitArgs : public StackObj {
3242 private:
3243 JavaVMInitArgs _args;
3244 char* _container_name;
3245 bool _is_set;
3246 char* _vm_options_file_arg;
3247
3248 public:
3249 ScopedVMInitArgs(const char *container_name) {
3250 _args.version = JNI_VERSION_1_2;
3251 _args.nOptions = 0;
3252 _args.options = NULL;
3253 _args.ignoreUnrecognized = false;
3254 _container_name = (char *)container_name;
3255 _is_set = false;
3256 _vm_options_file_arg = NULL;
3257 }
3258
3259 // Populates the JavaVMInitArgs object represented by this
3260 // ScopedVMInitArgs object with the arguments in options. The
3261 // allocated memory is deleted by the destructor. If this method
3262 // returns anything other than JNI_OK, then this object is in a
3263 // partially constructed state, and should be abandoned.
3264 jint set_args(GrowableArray<JavaVMOption>* options) {
3265 _is_set = true;
3266 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3267 JavaVMOption, options->length(), mtArguments);
3268 if (options_arr == NULL) {
3269 return JNI_ENOMEM;
3270 }
3271 _args.options = options_arr;
3272
3273 for (int i = 0; i < options->length(); i++) {
3274 options_arr[i] = options->at(i);
3275 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3276 if (options_arr[i].optionString == NULL) {
3277 // Rely on the destructor to do cleanup.
3278 _args.nOptions = i;
3279 return JNI_ENOMEM;
3280 }
3281 }
3282
3283 _args.nOptions = options->length();
3284 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3285 return JNI_OK;
3286 }
3287
3288 JavaVMInitArgs* get() { return &_args; }
3289 char* container_name() { return _container_name; }
3290 bool is_set() { return _is_set; }
3291 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3292 char* vm_options_file_arg() { return _vm_options_file_arg; }
3293
3294 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3295 if (_vm_options_file_arg != NULL) {
3296 os::free(_vm_options_file_arg);
3297 }
3298 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3299 }
3300
3301 ~ScopedVMInitArgs() {
3302 if (_vm_options_file_arg != NULL) {
3303 os::free(_vm_options_file_arg);
3304 }
3305 if (_args.options == NULL) return;
3306 for (int i = 0; i < _args.nOptions; i++) {
3307 os::free(_args.options[i].optionString);
3308 }
3309 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3310 }
3311
3312 // Insert options into this option list, to replace option at
3313 // vm_options_file_pos (-XX:VMOptionsFile)
3314 jint insert(const JavaVMInitArgs* args,
3315 const JavaVMInitArgs* args_to_insert,
3316 const int vm_options_file_pos) {
3317 assert(_args.options == NULL, "shouldn't be set yet");
3318 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3319 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3320
3321 int length = args->nOptions + args_to_insert->nOptions - 1;
3322 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3323 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3324 for (int i = 0; i < args->nOptions; i++) {
3325 if (i == vm_options_file_pos) {
3326 // insert the new options starting at the same place as the
3327 // -XX:VMOptionsFile option
3328 for (int j = 0; j < args_to_insert->nOptions; j++) {
3329 options->push(args_to_insert->options[j]);
3330 }
3331 } else {
3332 options->push(args->options[i]);
3333 }
3334 }
3335 // make into options array
3336 jint result = set_args(options);
3337 delete options;
3338 return result;
3339 }
3340 };
3341
3342 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3343 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3344 }
3345
3346 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3347 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3348 }
3349
3350 jint Arguments::parse_options_environment_variable(const char* name,
3351 ScopedVMInitArgs* vm_args) {
3352 char *buffer = ::getenv(name);
3353
3354 // Don't check this environment variable if user has special privileges
3355 // (e.g. unix su command).
3356 if (buffer == NULL || os::have_special_privileges()) {
3357 return JNI_OK;
3358 }
3359
3360 if ((buffer = os::strdup(buffer)) == NULL) {
3361 return JNI_ENOMEM;
3362 }
3363
3364 jio_fprintf(defaultStream::error_stream(),
3365 "Picked up %s: %s\n", name, buffer);
3366
3367 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3368
3369 os::free(buffer);
3370 return retcode;
3371 }
3372
3373 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3374 // read file into buffer
3375 int fd = ::open(file_name, O_RDONLY);
3376 if (fd < 0) {
3377 jio_fprintf(defaultStream::error_stream(),
3378 "Could not open options file '%s'\n",
3379 file_name);
3380 return JNI_ERR;
3381 }
3382
3383 struct stat stbuf;
3384 int retcode = os::stat(file_name, &stbuf);
3385 if (retcode != 0) {
3386 jio_fprintf(defaultStream::error_stream(),
3387 "Could not stat options file '%s'\n",
3388 file_name);
3389 os::close(fd);
3390 return JNI_ERR;
3391 }
3392
3393 if (stbuf.st_size == 0) {
3394 // tell caller there is no option data and that is ok
3395 os::close(fd);
3396 return JNI_OK;
3397 }
3398
3399 // '+ 1' for NULL termination even with max bytes
3400 size_t bytes_alloc = stbuf.st_size + 1;
3401
3402 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3403 if (NULL == buf) {
3404 jio_fprintf(defaultStream::error_stream(),
3405 "Could not allocate read buffer for options file parse\n");
3406 os::close(fd);
3407 return JNI_ENOMEM;
3408 }
3409
3410 memset(buf, 0, bytes_alloc);
3411
3412 // Fill buffer
3413 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3414 os::close(fd);
3415 if (bytes_read < 0) {
3416 FREE_C_HEAP_ARRAY(char, buf);
3417 jio_fprintf(defaultStream::error_stream(),
3418 "Could not read options file '%s'\n", file_name);
3419 return JNI_ERR;
3420 }
3421
3422 if (bytes_read == 0) {
3423 // tell caller there is no option data and that is ok
3424 FREE_C_HEAP_ARRAY(char, buf);
3425 return JNI_OK;
3426 }
3427
3428 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3429
3430 FREE_C_HEAP_ARRAY(char, buf);
3431 return retcode;
3432 }
3433
3434 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3435 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3436
3437 // some pointers to help with parsing
3438 char *buffer_end = buffer + buf_len;
3439 char *opt_hd = buffer;
3440 char *wrt = buffer;
3441 char *rd = buffer;
3442
3443 // parse all options
3444 while (rd < buffer_end) {
3445 // skip leading white space from the input string
3446 while (rd < buffer_end && isspace(*rd)) {
3447 rd++;
3448 }
3449
3450 if (rd >= buffer_end) {
3451 break;
3452 }
3453
3454 // Remember this is where we found the head of the token.
3455 opt_hd = wrt;
3456
3457 // Tokens are strings of non white space characters separated
3458 // by one or more white spaces.
3459 while (rd < buffer_end && !isspace(*rd)) {
3460 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3461 int quote = *rd; // matching quote to look for
3462 rd++; // don't copy open quote
3463 while (rd < buffer_end && *rd != quote) {
3464 // include everything (even spaces)
3465 // up until the close quote
3466 *wrt++ = *rd++; // copy to option string
3467 }
3468
3469 if (rd < buffer_end) {
3470 rd++; // don't copy close quote
3471 } else {
3472 // did not see closing quote
3473 jio_fprintf(defaultStream::error_stream(),
3474 "Unmatched quote in %s\n", name);
3475 delete options;
3476 return JNI_ERR;
3477 }
3478 } else {
3479 *wrt++ = *rd++; // copy to option string
3480 }
3481 }
3482
3483 // steal a white space character and set it to NULL
3484 *wrt++ = '\0';
3485 // We now have a complete token
3486
3487 JavaVMOption option;
3488 option.optionString = opt_hd;
3489 option.extraInfo = NULL;
3490
3491 options->append(option); // Fill in option
3492
3493 rd++; // Advance to next character
3494 }
3495
3496 // Fill out JavaVMInitArgs structure.
3497 jint status = vm_args->set_args(options);
3498
3499 delete options;
3500 return status;
3501 }
3502
3503 void Arguments::set_shared_spaces_flags() {
3504 if (DumpSharedSpaces) {
3505 if (RequireSharedSpaces) {
3506 warning("Cannot dump shared archive while using shared archive");
3507 }
3508 UseSharedSpaces = false;
3509 }
3510 }
3511
3512 #if INCLUDE_CDS
3513 // Sharing support
3514 // Construct the path to the archive
3515 char* Arguments::get_default_shared_archive_path() {
3516 char *default_archive_path;
3517 char jvm_path[JVM_MAXPATHLEN];
3518 os::jvm_path(jvm_path, sizeof(jvm_path));
3519 char *end = strrchr(jvm_path, *os::file_separator());
3520 if (end != NULL) *end = '\0';
3521 size_t jvm_path_len = strlen(jvm_path);
3522 size_t file_sep_len = strlen(os::file_separator());
3523 const size_t len = jvm_path_len + file_sep_len + 20;
3524 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3525 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3526 jvm_path, os::file_separator());
3527 return default_archive_path;
3528 }
3529
3530 int Arguments::num_archives(const char* archive_path) {
3531 if (archive_path == NULL) {
3532 return 0;
3533 }
3534 int npaths = 1;
3535 char* p = (char*)archive_path;
3536 while (*p != '\0') {
3537 if (*p == os::path_separator()[0]) {
3538 npaths++;
3539 }
3540 p++;
3541 }
3542 return npaths;
3543 }
3544
3545 void Arguments::extract_shared_archive_paths(const char* archive_path,
3546 char** base_archive_path,
3547 char** top_archive_path) {
3548 char* begin_ptr = (char*)archive_path;
3549 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3550 if (end_ptr == NULL || end_ptr == begin_ptr) {
3551 vm_exit_during_initialization("Base archive was not specified", archive_path);
3552 }
3553 size_t len = end_ptr - begin_ptr;
3554 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3555 strncpy(cur_path, begin_ptr, len);
3556 cur_path[len] = '\0';
3557 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3558 *base_archive_path = cur_path;
3559
3560 begin_ptr = ++end_ptr;
3561 if (*begin_ptr == '\0') {
3562 vm_exit_during_initialization("Top archive was not specified", archive_path);
3563 }
3564 end_ptr = strchr(begin_ptr, '\0');
3565 assert(end_ptr != NULL, "sanity");
3566 len = end_ptr - begin_ptr;
3567 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3568 strncpy(cur_path, begin_ptr, len + 1);
3569 //cur_path[len] = '\0';
3570 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3571 *top_archive_path = cur_path;
3572 }
3573
3574 bool Arguments::init_shared_archive_paths() {
3575 if (ArchiveClassesAtExit != NULL) {
3576 if (DumpSharedSpaces) {
3577 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3578 }
3579 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3580 return false;
3581 }
3582 check_unsupported_dumping_properties();
3583 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3584 }
3585 if (SharedArchiveFile == NULL) {
3586 SharedArchivePath = get_default_shared_archive_path();
3587 } else {
3588 int archives = num_archives(SharedArchiveFile);
3589 if (is_dumping_archive()) {
3590 if (archives > 1) {
3591 vm_exit_during_initialization(
3592 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3593 }
3594 if (DynamicDumpSharedSpaces) {
3595 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3596 vm_exit_during_initialization(
3597 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3598 SharedArchiveFile);
3599 }
3600 }
3601 }
3602 if (!is_dumping_archive()){
3603 if (archives > 2) {
3604 vm_exit_during_initialization(
3605 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3606 }
3607 if (archives == 1) {
3608 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3609 int name_size;
3610 bool success =
3611 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3612 if (!success) {
3613 SharedArchivePath = temp_archive_path;
3614 } else {
3615 SharedDynamicArchivePath = temp_archive_path;
3616 }
3617 } else {
3618 extract_shared_archive_paths((const char*)SharedArchiveFile,
3619 &SharedArchivePath, &SharedDynamicArchivePath);
3620 }
3621 } else { // CDS dumping
3622 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3623 }
3624 }
3625 return (SharedArchivePath != NULL);
3626 }
3627 #endif // INCLUDE_CDS
3628
3629 #ifndef PRODUCT
3630 // Determine whether LogVMOutput should be implicitly turned on.
3631 static bool use_vm_log() {
3632 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3633 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3634 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3635 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3636 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3637 return true;
3638 }
3639
3640 #ifdef COMPILER1
3641 if (PrintC1Statistics) {
3642 return true;
3643 }
3644 #endif // COMPILER1
3645
3646 #ifdef COMPILER2
3647 if (PrintOptoAssembly || PrintOptoStatistics) {
3648 return true;
3649 }
3650 #endif // COMPILER2
3651
3652 return false;
3653 }
3654
3655 #endif // PRODUCT
3656
3657 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3658 for (int index = 0; index < args->nOptions; index++) {
3659 const JavaVMOption* option = args->options + index;
3660 const char* tail;
3661 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3662 return true;
3663 }
3664 }
3665 return false;
3666 }
3667
3668 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3669 const char* vm_options_file,
3670 const int vm_options_file_pos,
3671 ScopedVMInitArgs* vm_options_file_args,
3672 ScopedVMInitArgs* args_out) {
3673 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3674 if (code != JNI_OK) {
3675 return code;
3676 }
3677
3678 if (vm_options_file_args->get()->nOptions < 1) {
3679 return JNI_OK;
3680 }
3681
3682 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3683 jio_fprintf(defaultStream::error_stream(),
3684 "A VM options file may not refer to a VM options file. "
3685 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3686 "options file '%s' in options container '%s' is an error.\n",
3687 vm_options_file_args->vm_options_file_arg(),
3688 vm_options_file_args->container_name());
3689 return JNI_EINVAL;
3690 }
3691
3692 return args_out->insert(args, vm_options_file_args->get(),
3693 vm_options_file_pos);
3694 }
3695
3696 // Expand -XX:VMOptionsFile found in args_in as needed.
3697 // mod_args and args_out parameters may return values as needed.
3698 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3699 ScopedVMInitArgs* mod_args,
3700 JavaVMInitArgs** args_out) {
3701 jint code = match_special_option_and_act(args_in, mod_args);
3702 if (code != JNI_OK) {
3703 return code;
3704 }
3705
3706 if (mod_args->is_set()) {
3707 // args_in contains -XX:VMOptionsFile and mod_args contains the
3708 // original options from args_in along with the options expanded
3709 // from the VMOptionsFile. Return a short-hand to the caller.
3710 *args_out = mod_args->get();
3711 } else {
3712 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3713 }
3714 return JNI_OK;
3715 }
3716
3717 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3718 ScopedVMInitArgs* args_out) {
3719 // Remaining part of option string
3720 const char* tail;
3721 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3722
3723 for (int index = 0; index < args->nOptions; index++) {
3724 const JavaVMOption* option = args->options + index;
3725 if (match_option(option, "-XX:Flags=", &tail)) {
3726 Arguments::set_jvm_flags_file(tail);
3727 continue;
3728 }
3729 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3730 if (vm_options_file_args.found_vm_options_file_arg()) {
3731 jio_fprintf(defaultStream::error_stream(),
3732 "The option '%s' is already specified in the options "
3733 "container '%s' so the specification of '%s' in the "
3734 "same options container is an error.\n",
3735 vm_options_file_args.vm_options_file_arg(),
3736 vm_options_file_args.container_name(),
3737 option->optionString);
3738 return JNI_EINVAL;
3739 }
3740 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3741 // If there's a VMOptionsFile, parse that
3742 jint code = insert_vm_options_file(args, tail, index,
3743 &vm_options_file_args, args_out);
3744 if (code != JNI_OK) {
3745 return code;
3746 }
3747 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3748 if (args_out->is_set()) {
3749 // The VMOptions file inserted some options so switch 'args'
3750 // to the new set of options, and continue processing which
3751 // preserves "last option wins" semantics.
3752 args = args_out->get();
3753 // The first option from the VMOptionsFile replaces the
3754 // current option. So we back track to process the
3755 // replacement option.
3756 index--;
3757 }
3758 continue;
3759 }
3760 if (match_option(option, "-XX:+PrintVMOptions")) {
3761 PrintVMOptions = true;
3762 continue;
3763 }
3764 if (match_option(option, "-XX:-PrintVMOptions")) {
3765 PrintVMOptions = false;
3766 continue;
3767 }
3768 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3769 IgnoreUnrecognizedVMOptions = true;
3770 continue;
3771 }
3772 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3773 IgnoreUnrecognizedVMOptions = false;
3774 continue;
3775 }
3776 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3777 JVMFlag::printFlags(tty, false);
3778 vm_exit(0);
3779 }
3780 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3781 #if INCLUDE_NMT
3782 // The launcher did not setup nmt environment variable properly.
3783 if (!MemTracker::check_launcher_nmt_support(tail)) {
3784 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3785 }
3786
3787 // Verify if nmt option is valid.
3788 if (MemTracker::verify_nmt_option()) {
3789 // Late initialization, still in single-threaded mode.
3790 if (MemTracker::tracking_level() >= NMT_summary) {
3791 MemTracker::init();
3792 }
3793 } else {
3794 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3795 }
3796 continue;
3797 #else
3798 jio_fprintf(defaultStream::error_stream(),
3799 "Native Memory Tracking is not supported in this VM\n");
3800 return JNI_ERR;
3801 #endif
3802 }
3803
3804 #ifndef PRODUCT
3805 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3806 JVMFlag::printFlags(tty, true);
3807 vm_exit(0);
3808 }
3809 #endif
3810 }
3811 return JNI_OK;
3812 }
3813
3814 static void print_options(const JavaVMInitArgs *args) {
3815 const char* tail;
3816 for (int index = 0; index < args->nOptions; index++) {
3817 const JavaVMOption *option = args->options + index;
3818 if (match_option(option, "-XX:", &tail)) {
3819 logOption(tail);
3820 }
3821 }
3822 }
3823
3824 bool Arguments::handle_deprecated_print_gc_flags() {
3825 if (PrintGC) {
3826 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3827 }
3828 if (PrintGCDetails) {
3829 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3830 }
3831
3832 if (_gc_log_filename != NULL) {
3833 // -Xloggc was used to specify a filename
3834 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3835
3836 LogTarget(Error, logging) target;
3837 LogStream errstream(target);
3838 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3839 } else if (PrintGC || PrintGCDetails) {
3840 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3841 }
3842 return true;
3843 }
3844
3845 // Parse entry point called from JNI_CreateJavaVM
3846
3847 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3848 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3849
3850 // Initialize ranges and constraints
3851 JVMFlagRangeList::init();
3852 JVMFlagConstraintList::init();
3853
3854 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3855 const char* hotspotrc = ".hotspotrc";
3856 bool settings_file_specified = false;
3857 bool needs_hotspotrc_warning = false;
3858 ScopedVMInitArgs initial_vm_options_args("");
3859 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3860 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3861
3862 // Pointers to current working set of containers
3863 JavaVMInitArgs* cur_cmd_args;
3864 JavaVMInitArgs* cur_vm_options_args;
3865 JavaVMInitArgs* cur_java_options_args;
3866 JavaVMInitArgs* cur_java_tool_options_args;
3867
3868 // Containers for modified/expanded options
3869 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3870 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3871 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3872 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3873
3874
3875 jint code =
3876 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3877 if (code != JNI_OK) {
3878 return code;
3879 }
3880
3881 code = parse_java_options_environment_variable(&initial_java_options_args);
3882 if (code != JNI_OK) {
3883 return code;
3884 }
3885
3886 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3887 char *vmoptions = ClassLoader::lookup_vm_options();
3888 if (vmoptions != NULL) {
3889 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3890 FREE_C_HEAP_ARRAY(char, vmoptions);
3891 if (code != JNI_OK) {
3892 return code;
3893 }
3894 }
3895
3896 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3897 &mod_java_tool_options_args,
3898 &cur_java_tool_options_args);
3899 if (code != JNI_OK) {
3900 return code;
3901 }
3902
3903 code = expand_vm_options_as_needed(initial_cmd_args,
3904 &mod_cmd_args,
3905 &cur_cmd_args);
3906 if (code != JNI_OK) {
3907 return code;
3908 }
3909
3910 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3911 &mod_java_options_args,
3912 &cur_java_options_args);
3913 if (code != JNI_OK) {
3914 return code;
3915 }
3916
3917 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3918 &mod_vm_options_args,
3919 &cur_vm_options_args);
3920 if (code != JNI_OK) {
3921 return code;
3922 }
3923
3924 const char* flags_file = Arguments::get_jvm_flags_file();
3925 settings_file_specified = (flags_file != NULL);
3926
3927 if (IgnoreUnrecognizedVMOptions) {
3928 cur_cmd_args->ignoreUnrecognized = true;
3929 cur_java_tool_options_args->ignoreUnrecognized = true;
3930 cur_java_options_args->ignoreUnrecognized = true;
3931 }
3932
3933 // Parse specified settings file
3934 if (settings_file_specified) {
3935 if (!process_settings_file(flags_file, true,
3936 cur_cmd_args->ignoreUnrecognized)) {
3937 return JNI_EINVAL;
3938 }
3939 } else {
3940 #ifdef ASSERT
3941 // Parse default .hotspotrc settings file
3942 if (!process_settings_file(".hotspotrc", false,
3943 cur_cmd_args->ignoreUnrecognized)) {
3944 return JNI_EINVAL;
3945 }
3946 #else
3947 struct stat buf;
3948 if (os::stat(hotspotrc, &buf) == 0) {
3949 needs_hotspotrc_warning = true;
3950 }
3951 #endif
3952 }
3953
3954 if (PrintVMOptions) {
3955 print_options(cur_java_tool_options_args);
3956 print_options(cur_cmd_args);
3957 print_options(cur_java_options_args);
3958 }
3959
3960 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3961 jint result = parse_vm_init_args(cur_vm_options_args,
3962 cur_java_tool_options_args,
3963 cur_java_options_args,
3964 cur_cmd_args);
3965
3966 if (result != JNI_OK) {
3967 return result;
3968 }
3969
3970 #if INCLUDE_CDS
3971 // Initialize shared archive paths which could include both base and dynamic archive paths
3972 if (!init_shared_archive_paths()) {
3973 return JNI_ENOMEM;
3974 }
3975 #endif
3976
3977 // Delay warning until here so that we've had a chance to process
3978 // the -XX:-PrintWarnings flag
3979 if (needs_hotspotrc_warning) {
3980 warning("%s file is present but has been ignored. "
3981 "Run with -XX:Flags=%s to load the file.",
3982 hotspotrc, hotspotrc);
3983 }
3984
3985 if (needs_module_property_warning) {
3986 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3987 " names that are reserved for internal use.");
3988 }
3989
3990 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3991 UNSUPPORTED_OPTION(UseLargePages);
3992 #endif
3993
3994 #if defined(AIX)
3995 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3996 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3997 #endif
3998
3999 #ifndef PRODUCT
4000 if (TraceBytecodesAt != 0) {
4001 TraceBytecodes = true;
4002 }
4003 if (CountCompiledCalls) {
4004 if (UseCounterDecay) {
4005 warning("UseCounterDecay disabled because CountCalls is set");
4006 UseCounterDecay = false;
4007 }
4008 }
4009 #endif // PRODUCT
4010
4011 if (ScavengeRootsInCode == 0) {
4012 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4013 warning("Forcing ScavengeRootsInCode non-zero");
4014 }
4015 ScavengeRootsInCode = 1;
4016 }
4017
4018 if (!handle_deprecated_print_gc_flags()) {
4019 return JNI_EINVAL;
4020 }
4021
4022 // Set object alignment values.
4023 set_object_alignment();
4024
4025 #if !INCLUDE_CDS
4026 if (DumpSharedSpaces || RequireSharedSpaces) {
4027 jio_fprintf(defaultStream::error_stream(),
4028 "Shared spaces are not supported in this VM\n");
4029 return JNI_ERR;
4030 }
4031 if (DumpLoadedClassList != NULL) {
4032 jio_fprintf(defaultStream::error_stream(),
4033 "DumpLoadedClassList is not supported in this VM\n");
4034 return JNI_ERR;
4035 }
4036 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4037 log_is_enabled(Info, cds)) {
4038 warning("Shared spaces are not supported in this VM");
4039 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4040 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4041 }
4042 no_shared_spaces("CDS Disabled");
4043 #endif // INCLUDE_CDS
4044
4045 #ifndef TIERED
4046 if (FLAG_IS_CMDLINE(CompilationMode)) {
4047 warning("CompilationMode has no effect in non-tiered VMs");
4048 }
4049 #endif
4050
4051 return JNI_OK;
4052 }
4053
4054 jint Arguments::apply_ergo() {
4055 // Set flags based on ergonomics.
4056 jint result = set_ergonomics_flags();
4057 if (result != JNI_OK) return result;
4058
4059 // Set heap size based on available physical memory
4060 set_heap_size();
4061
4062 GCConfig::arguments()->initialize();
4063
4064 set_shared_spaces_flags();
4065
4066 // Initialize Metaspace flags and alignments
4067 Metaspace::ergo_initialize();
4068
4069 // Set compiler flags after GC is selected and GC specific
4070 // flags (LoopStripMiningIter) are set.
4071 CompilerConfig::ergo_initialize();
4072
4073 // Set bytecode rewriting flags
4074 set_bytecode_flags();
4075
4076 // Set flags if aggressive optimization flags are enabled
4077 jint code = set_aggressive_opts_flags();
4078 if (code != JNI_OK) {
4079 return code;
4080 }
4081
4082 // Turn off biased locking for locking debug mode flags,
4083 // which are subtly different from each other but neither works with
4084 // biased locking
4085 if (UseHeavyMonitors
4086 #ifdef COMPILER1
4087 || !UseFastLocking
4088 #endif // COMPILER1
4089 #if INCLUDE_JVMCI
4090 || !JVMCIUseFastLocking
4091 #endif
4092 ) {
4093 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4094 // flag set to true on command line; warn the user that they
4095 // can't enable biased locking here
4096 warning("Biased Locking is not supported with locking debug flags"
4097 "; ignoring UseBiasedLocking flag." );
4098 }
4099 UseBiasedLocking = false;
4100 }
4101
4102 #ifdef CC_INTERP
4103 // Clear flags not supported on zero.
4104 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4105 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4106 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4107 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4108 #endif // CC_INTERP
4109
4110 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4111 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4112 DebugNonSafepoints = true;
4113 }
4114
4115 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4116 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4117 }
4118
4119 // Treat the odd case where local verification is enabled but remote
4120 // verification is not as if both were enabled.
4121 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4122 log_info(verification)("Turning on remote verification because local verification is on");
4123 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4124 }
4125
4126 #ifndef PRODUCT
4127 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4128 if (use_vm_log()) {
4129 LogVMOutput = true;
4130 }
4131 }
4132 #endif // PRODUCT
4133
4134 if (PrintCommandLineFlags) {
4135 JVMFlag::printSetFlags(tty);
4136 }
4137
4138 // Apply CPU specific policy for the BiasedLocking
4139 if (UseBiasedLocking) {
4140 if (!VM_Version::use_biased_locking() &&
4141 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4142 UseBiasedLocking = false;
4143 }
4144 }
4145 #ifdef COMPILER2
4146 if (!UseBiasedLocking) {
4147 UseOptoBiasInlining = false;
4148 }
4149 #endif
4150
4151 return JNI_OK;
4152 }
4153
4154 jint Arguments::adjust_after_os() {
4155 if (UseNUMA) {
4156 if (UseParallelGC) {
4157 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4158 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4159 }
4160 }
4161 // UseNUMAInterleaving is set to ON for all collectors and platforms when
4162 // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and
4163 // survivor spaces on top of NUMA allocation policy for the eden space.
4164 // Non NUMA-aware collectors will interleave all of the heap spaces across
4165 // NUMA nodes.
4166 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4167 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4168 }
4169 }
4170 return JNI_OK;
4171 }
4172
4173 int Arguments::PropertyList_count(SystemProperty* pl) {
4174 int count = 0;
4175 while(pl != NULL) {
4176 count++;
4177 pl = pl->next();
4178 }
4179 return count;
4180 }
4181
4182 // Return the number of readable properties.
4183 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4184 int count = 0;
4185 while(pl != NULL) {
4186 if (pl->is_readable()) {
4187 count++;
4188 }
4189 pl = pl->next();
4190 }
4191 return count;
4192 }
4193
4194 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4195 assert(key != NULL, "just checking");
4196 SystemProperty* prop;
4197 for (prop = pl; prop != NULL; prop = prop->next()) {
4198 if (strcmp(key, prop->key()) == 0) return prop->value();
4199 }
4200 return NULL;
4201 }
4202
4203 // Return the value of the requested property provided that it is a readable property.
4204 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4205 assert(key != NULL, "just checking");
4206 SystemProperty* prop;
4207 // Return the property value if the keys match and the property is not internal or
4208 // it's the special internal property "jdk.boot.class.path.append".
4209 for (prop = pl; prop != NULL; prop = prop->next()) {
4210 if (strcmp(key, prop->key()) == 0) {
4211 if (!prop->internal()) {
4212 return prop->value();
4213 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4214 return prop->value();
4215 } else {
4216 // Property is internal and not jdk.boot.class.path.append so return NULL.
4217 return NULL;
4218 }
4219 }
4220 }
4221 return NULL;
4222 }
4223
4224 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4225 int count = 0;
4226 const char* ret_val = NULL;
4227
4228 while(pl != NULL) {
4229 if(count >= index) {
4230 ret_val = pl->key();
4231 break;
4232 }
4233 count++;
4234 pl = pl->next();
4235 }
4236
4237 return ret_val;
4238 }
4239
4240 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4241 int count = 0;
4242 char* ret_val = NULL;
4243
4244 while(pl != NULL) {
4245 if(count >= index) {
4246 ret_val = pl->value();
4247 break;
4248 }
4249 count++;
4250 pl = pl->next();
4251 }
4252
4253 return ret_val;
4254 }
4255
4256 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4257 SystemProperty* p = *plist;
4258 if (p == NULL) {
4259 *plist = new_p;
4260 } else {
4261 while (p->next() != NULL) {
4262 p = p->next();
4263 }
4264 p->set_next(new_p);
4265 }
4266 }
4267
4268 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4269 bool writeable, bool internal) {
4270 if (plist == NULL)
4271 return;
4272
4273 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4274 PropertyList_add(plist, new_p);
4275 }
4276
4277 void Arguments::PropertyList_add(SystemProperty *element) {
4278 PropertyList_add(&_system_properties, element);
4279 }
4280
4281 // This add maintains unique property key in the list.
4282 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4283 PropertyAppendable append, PropertyWriteable writeable,
4284 PropertyInternal internal) {
4285 if (plist == NULL)
4286 return;
4287
4288 // If property key exist then update with new value.
4289 SystemProperty* prop;
4290 for (prop = *plist; prop != NULL; prop = prop->next()) {
4291 if (strcmp(k, prop->key()) == 0) {
4292 if (append == AppendProperty) {
4293 prop->append_value(v);
4294 } else {
4295 prop->set_value(v);
4296 }
4297 return;
4298 }
4299 }
4300
4301 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4302 }
4303
4304 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4305 // Returns true if all of the source pointed by src has been copied over to
4306 // the destination buffer pointed by buf. Otherwise, returns false.
4307 // Notes:
4308 // 1. If the length (buflen) of the destination buffer excluding the
4309 // NULL terminator character is not long enough for holding the expanded
4310 // pid characters, it also returns false instead of returning the partially
4311 // expanded one.
4312 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4313 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4314 char* buf, size_t buflen) {
4315 const char* p = src;
4316 char* b = buf;
4317 const char* src_end = &src[srclen];
4318 char* buf_end = &buf[buflen - 1];
4319
4320 while (p < src_end && b < buf_end) {
4321 if (*p == '%') {
4322 switch (*(++p)) {
4323 case '%': // "%%" ==> "%"
4324 *b++ = *p++;
4325 break;
4326 case 'p': { // "%p" ==> current process id
4327 // buf_end points to the character before the last character so
4328 // that we could write '\0' to the end of the buffer.
4329 size_t buf_sz = buf_end - b + 1;
4330 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4331
4332 // if jio_snprintf fails or the buffer is not long enough to hold
4333 // the expanded pid, returns false.
4334 if (ret < 0 || ret >= (int)buf_sz) {
4335 return false;
4336 } else {
4337 b += ret;
4338 assert(*b == '\0', "fail in copy_expand_pid");
4339 if (p == src_end && b == buf_end + 1) {
4340 // reach the end of the buffer.
4341 return true;
4342 }
4343 }
4344 p++;
4345 break;
4346 }
4347 default :
4348 *b++ = '%';
4349 }
4350 } else {
4351 *b++ = *p++;
4352 }
4353 }
4354 *b = '\0';
4355 return (p == src_end); // return false if not all of the source was copied
4356 }