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