1 /*
2 * Copyright (c) 1997, 2018, 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/collectorPolicy.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/flags/jvmFlag.hpp"
46 #include "runtime/flags/jvmFlagConstraintList.hpp"
47 #include "runtime/flags/jvmFlagWriteableList.hpp"
48 #include "runtime/flags/jvmFlagRangeList.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.inline.hpp"
52 #include "runtime/safepoint.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64 #if INCLUDE_JFR
65 #include "jfr/jfr.hpp"
66 #endif
67
68 // Note: This is a special bug reporting site for the JVM
69 #ifdef VENDOR_URL_VM_BUG
70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
71 #else
72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
73 #endif
74 #define DEFAULT_JAVA_LAUNCHER "generic"
75
76 char* Arguments::_jvm_flags_file = NULL;
77 char** Arguments::_jvm_flags_array = NULL;
78 int Arguments::_num_jvm_flags = 0;
79 char** Arguments::_jvm_args_array = NULL;
80 int Arguments::_num_jvm_args = 0;
81 char* Arguments::_java_command = NULL;
82 SystemProperty* Arguments::_system_properties = NULL;
83 const char* Arguments::_gc_log_filename = NULL;
84 size_t Arguments::_conservative_max_heap_alignment = 0;
85 size_t Arguments::_min_heap_size = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 bool Arguments::_enable_preview = false;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 abort_hook_t Arguments::_abort_hook = NULL;
110 exit_hook_t Arguments::_exit_hook = NULL;
111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
115 SystemProperty *Arguments::_java_library_path = NULL;
116 SystemProperty *Arguments::_java_home = NULL;
117 SystemProperty *Arguments::_java_class_path = NULL;
118 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
119 SystemProperty *Arguments::_vm_info = NULL;
120
121 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
122 PathString *Arguments::_system_boot_class_path = NULL;
123 bool Arguments::_has_jimage = false;
124
125 char* Arguments::_ext_dirs = NULL;
126
127 bool PathString::set_value(const char *value) {
128 if (_value != NULL) {
129 FreeHeap(_value);
130 }
131 _value = AllocateHeap(strlen(value)+1, mtArguments);
132 assert(_value != NULL, "Unable to allocate space for new path value");
133 if (_value != NULL) {
134 strcpy(_value, value);
135 } else {
136 // not able to allocate
137 return false;
138 }
139 return true;
140 }
141
142 void PathString::append_value(const char *value) {
143 char *sp;
144 size_t len = 0;
145 if (value != NULL) {
146 len = strlen(value);
147 if (_value != NULL) {
148 len += strlen(_value);
149 }
150 sp = AllocateHeap(len+2, mtArguments);
151 assert(sp != NULL, "Unable to allocate space for new append path value");
152 if (sp != NULL) {
153 if (_value != NULL) {
154 strcpy(sp, _value);
155 strcat(sp, os::path_separator());
156 strcat(sp, value);
157 FreeHeap(_value);
158 } else {
159 strcpy(sp, value);
160 }
161 _value = sp;
162 }
163 }
164 }
165
166 PathString::PathString(const char* value) {
167 if (value == NULL) {
168 _value = NULL;
169 } else {
170 _value = AllocateHeap(strlen(value)+1, mtArguments);
171 strcpy(_value, value);
172 }
173 }
174
175 PathString::~PathString() {
176 if (_value != NULL) {
177 FreeHeap(_value);
178 _value = NULL;
179 }
180 }
181
182 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
183 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
184 size_t len = strlen(module_name) + 1;
185 _module_name = AllocateHeap(len, mtInternal);
186 strncpy(_module_name, module_name, len); // copy the trailing null
187 _path = new PathString(path);
188 }
189
190 ModulePatchPath::~ModulePatchPath() {
191 if (_module_name != NULL) {
192 FreeHeap(_module_name);
193 _module_name = NULL;
194 }
195 if (_path != NULL) {
196 delete _path;
197 _path = NULL;
198 }
199 }
200
201 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
202 if (key == NULL) {
203 _key = NULL;
204 } else {
205 _key = AllocateHeap(strlen(key)+1, mtArguments);
206 strcpy(_key, key);
207 }
208 _next = NULL;
209 _internal = internal;
210 _writeable = writeable;
211 }
212
213 AgentLibrary::AgentLibrary(const char* name, const char* options,
214 bool is_absolute_path, void* os_lib,
215 bool instrument_lib) {
216 _name = AllocateHeap(strlen(name)+1, mtArguments);
217 strcpy(_name, name);
218 if (options == NULL) {
219 _options = NULL;
220 } else {
221 _options = AllocateHeap(strlen(options)+1, mtArguments);
222 strcpy(_options, options);
223 }
224 _is_absolute_path = is_absolute_path;
225 _os_lib = os_lib;
226 _next = NULL;
227 _state = agent_invalid;
228 _is_static_lib = false;
229 _is_instrument_lib = instrument_lib;
230 }
231
232 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
233 // part of the option string.
234 static bool match_option(const JavaVMOption *option, const char* name,
235 const char** tail) {
236 size_t len = strlen(name);
237 if (strncmp(option->optionString, name, len) == 0) {
238 *tail = option->optionString + len;
239 return true;
240 } else {
241 return false;
242 }
243 }
244
245 // Check if 'option' matches 'name'. No "tail" is allowed.
246 static bool match_option(const JavaVMOption *option, const char* name) {
247 const char* tail = NULL;
248 bool result = match_option(option, name, &tail);
249 if (tail != NULL && *tail == '\0') {
250 return result;
251 } else {
252 return false;
253 }
254 }
255
256 // Return true if any of the strings in null-terminated array 'names' matches.
257 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
258 // the option must match exactly.
259 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
260 bool tail_allowed) {
261 for (/* empty */; *names != NULL; ++names) {
262 if (match_option(option, *names, tail)) {
263 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
264 return true;
265 }
266 }
267 }
268 return false;
269 }
270
271 #if INCLUDE_JFR
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 return Jfr::on_flight_recorder_option(option, tail);
280 }
281 return false;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
330 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
331 }
332
333 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
334 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
335 return ((strncmp(option, property, len) == 0) &&
336 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
337 }
338
339 // Return true if property starts with "jdk.module." and its ensuing chars match
340 // any of the reserved module properties.
341 // property should be passed without the leading "-D".
342 bool Arguments::is_internal_module_property(const char* property) {
343 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
347 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
348 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
349 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
350 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
351 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
352 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
353 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
354 return true;
355 }
356 }
357 return false;
358 }
359
360 // Process java launcher properties.
361 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
362 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
363 // sun.java.launcher.pid is defined.
364 // Must do this before setting up other system properties,
365 // as some of them may depend on launcher type.
366 for (int index = 0; index < args->nOptions; index++) {
367 const JavaVMOption* option = args->options + index;
368 const char* tail;
369
370 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
371 process_java_launcher_argument(tail, option->extraInfo);
372 continue;
373 }
374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
375 if (strcmp(tail, "true") == 0) {
376 _sun_java_launcher_is_altjvm = true;
377 }
378 continue;
379 }
380 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
381 _sun_java_launcher_pid = atoi(tail);
382 continue;
383 }
384 }
385 }
386
387 // Initialize system properties key and value.
388 void Arguments::init_system_properties() {
389
390 // Set up _system_boot_class_path which is not a property but
391 // relies heavily on argument processing and the jdk.boot.class.path.append
392 // property. It is used to store the underlying system boot class path.
393 _system_boot_class_path = new PathString(NULL);
394
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
396 "Java Virtual Machine Specification", false));
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
399 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
400
401 // Initialize the vm.info now, but it will need updating after argument parsing.
402 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
403
404 // Following are JVMTI agent writable properties.
405 // Properties values are set to NULL and they are
406 // os specific they are initialized in os::init_system_properties_values().
407 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
408 _java_library_path = new SystemProperty("java.library.path", NULL, true);
409 _java_home = new SystemProperty("java.home", NULL, true);
410 _java_class_path = new SystemProperty("java.class.path", "", true);
411 // jdk.boot.class.path.append is a non-writeable, internal property.
412 // It can only be set by either:
413 // - -Xbootclasspath/a:
414 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
415 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
416
417 // Add to System Property list.
418 PropertyList_add(&_system_properties, _sun_boot_library_path);
419 PropertyList_add(&_system_properties, _java_library_path);
420 PropertyList_add(&_system_properties, _java_home);
421 PropertyList_add(&_system_properties, _java_class_path);
422 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
423 PropertyList_add(&_system_properties, _vm_info);
424
425 // Set OS specific system properties values
426 os::init_system_properties_values();
427 }
428
429 // Update/Initialize System properties after JDK version number is known
430 void Arguments::init_version_specific_system_properties() {
431 enum { bufsz = 16 };
432 char buffer[bufsz];
433 const char* spec_vendor = "Oracle Corporation";
434 uint32_t spec_version = JDK_Version::current().major_version();
435
436 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
437
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.version", buffer, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
444 }
445
446 /*
447 * -XX argument processing:
448 *
449 * -XX arguments are defined in several places, such as:
450 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
451 * -XX arguments are parsed in parse_argument().
452 * -XX argument bounds checking is done in check_vm_args_consistency().
453 *
454 * Over time -XX arguments may change. There are mechanisms to handle common cases:
455 *
456 * ALIASED: An option that is simply another name for another option. This is often
457 * part of the process of deprecating a flag, but not all aliases need
458 * to be deprecated.
459 *
460 * Create an alias for an option by adding the old and new option names to the
461 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
462 *
463 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
464 * support may be removed in the future. Both regular and aliased options may be
465 * deprecated.
466 *
467 * Add a deprecation warning for an option (or alias) by adding an entry in the
468 * "special_jvm_flags" table and setting the "deprecated_in" field.
469 * Often an option "deprecated" in one major release will
470 * be made "obsolete" in the next. In this case the entry should also have its
471 * "obsolete_in" field set.
472 *
473 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
474 * on the command line. A warning is printed to let the user know that option might not
475 * be accepted in the future.
476 *
477 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
478 * table and setting the "obsolete_in" field.
479 *
480 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
481 * to the current JDK version. The system will flatly refuse to admit the existence of
482 * the flag. This allows a flag to die automatically over JDK releases.
483 *
484 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
485 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
486 * - Newly obsolete or expired deprecated options should have their global variable
487 * definitions removed (from globals.hpp, etc) and related implementations removed.
488 *
489 * Recommended approach for removing options:
490 *
491 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
492 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
493 *
494 * To remove internal options (e.g. diagnostic, experimental, develop options), use
495 * a 2-step model adding major release numbers to the obsolete and expire columns.
496 *
497 * To change the name of an option, use the alias table as well as a 2-step
498 * model adding major release numbers to the deprecate and expire columns.
499 * Think twice about aliasing commonly used customer options.
500 *
501 * There are times when it is appropriate to leave a future release number as undefined.
502 *
503 * Tests: Aliases should be tested in VMAliasOptions.java.
504 * Deprecated options should be tested in VMDeprecatedOptions.java.
505 */
506
507 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
508 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
509 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
510 // the command-line as usual, but will issue a warning.
511 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
512 // the command-line, while issuing a warning and ignoring the flag value.
513 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
514 // existence of the flag.
515 //
516 // MANUAL CLEANUP ON JDK VERSION UPDATES:
517 // This table ensures that the handling of options will update automatically when the JDK
518 // version is incremented, but the source code needs to be cleanup up manually:
519 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
520 // variable should be removed, as well as users of the variable.
521 // - As "deprecated" options age into "obsolete" options, move the entry into the
522 // "Obsolete Flags" section of the table.
523 // - All expired options should be removed from the table.
524 static SpecialFlag const special_jvm_flags[] = {
525 // -------------- Deprecated Flags --------------
526 // --- Non-alias flags - sorted by obsolete_in then expired_in:
527 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
529 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
530 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
537 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
538 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
539 { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
540 { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
541 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
542 { "AllowNonVirtualCalls", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
543
544 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
545 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
546 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
547 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
548 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
549
550 // -------------- Obsolete Flags - sorted by expired_in --------------
551 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
552 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
553 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
554 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
555 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
556 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
557 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
558 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
559 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
560 { "TraceScavenge", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
561 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
562 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
563 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
564 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
565 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
566 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
567 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
568 { "UseAppCDS", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
569 { "InlineNotify", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
570 { "EnableTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
571 { "UseLockedTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
572
573 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
574 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
575 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
576 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
577 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
578 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
579 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
580 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
581 #endif
582
583 { NULL, JDK_Version(0), JDK_Version(0) }
584 };
585
586 // Flags that are aliases for other flags.
587 typedef struct {
588 const char* alias_name;
589 const char* real_name;
590 } AliasedFlag;
591
592 static AliasedFlag const aliased_jvm_flags[] = {
593 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
594 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
595 { NULL, NULL}
596 };
597
598 // NOTE: A compatibility request will be necessary for each alias to be removed.
599 static AliasedLoggingFlag const aliased_logging_flags[] = {
600 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
601 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
602 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
603 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
604 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
605 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
606 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
607 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
608 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
609 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
610 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
611 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
612 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
613 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
614 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
615 };
616
617 #ifndef PRODUCT
618 // These options are removed in jdk9. Remove this code for jdk10.
619 static AliasedFlag const removed_develop_logging_flags[] = {
620 { "TraceClassInitialization", "-Xlog:class+init" },
621 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
622 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
623 { "TraceItables", "-Xlog:itables=debug" },
624 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
625 { "TraceSafepoint", "-Xlog:safepoint=debug" },
626 { "TraceStartupTime", "-Xlog:startuptime" },
627 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
628 { "PrintVtables", "-Xlog:vtables=debug" },
629 { "VerboseVerification", "-Xlog:verification" },
630 { NULL, NULL }
631 };
632 #endif //PRODUCT
633
634 // Return true if "v" is less than "other", where "other" may be "undefined".
635 static bool version_less_than(JDK_Version v, JDK_Version other) {
636 assert(!v.is_undefined(), "must be defined");
637 if (!other.is_undefined() && v.compare(other) >= 0) {
638 return false;
639 } else {
640 return true;
641 }
642 }
643
644 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
645
646 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
647 // Allow extensions to have priority
648 if (lookup_special_flag_ext(flag_name, flag)) {
649 return true;
650 }
651
652 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
653 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
654 flag = special_jvm_flags[i];
655 return true;
656 }
657 }
658 return false;
659 }
660
661 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
662 assert(version != NULL, "Must provide a version buffer");
663 SpecialFlag flag;
664 if (lookup_special_flag(flag_name, flag)) {
665 if (!flag.obsolete_in.is_undefined()) {
666 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
667 *version = flag.obsolete_in;
668 return true;
669 }
670 }
671 }
672 return false;
673 }
674
675 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
676 assert(version != NULL, "Must provide a version buffer");
677 SpecialFlag flag;
678 if (lookup_special_flag(flag_name, flag)) {
679 if (!flag.deprecated_in.is_undefined()) {
680 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
681 version_less_than(JDK_Version::current(), flag.expired_in)) {
682 *version = flag.deprecated_in;
683 return 1;
684 } else {
685 return -1;
686 }
687 }
688 }
689 return 0;
690 }
691
692 #ifndef PRODUCT
693 const char* Arguments::removed_develop_logging_flag_name(const char* name){
694 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
695 const AliasedFlag& flag = removed_develop_logging_flags[i];
696 if (strcmp(flag.alias_name, name) == 0) {
697 return flag.real_name;
698 }
699 }
700 return NULL;
701 }
702 #endif // PRODUCT
703
704 const char* Arguments::real_flag_name(const char *flag_name) {
705 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
706 const AliasedFlag& flag_status = aliased_jvm_flags[i];
707 if (strcmp(flag_status.alias_name, flag_name) == 0) {
708 return flag_status.real_name;
709 }
710 }
711 return flag_name;
712 }
713
714 #ifdef ASSERT
715 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
716 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
717 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
718 return true;
719 }
720 }
721 return false;
722 }
723
724 // Verifies the correctness of the entries in the special_jvm_flags table.
725 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
726 // version being earlier than the deprecation version, then a warning is issued
727 // and verification fails - by returning false. If it is detected that the table
728 // is out of date, with respect to the current version, then a warning is issued
729 // but verification does not fail. This allows the VM to operate when the version
730 // is first updated, without needing to update all the impacted flags at the
731 // same time.
732 static bool verify_special_jvm_flags() {
733 bool success = true;
734 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
735 const SpecialFlag& flag = special_jvm_flags[i];
736 if (lookup_special_flag(flag.name, i)) {
737 warning("Duplicate special flag declaration \"%s\"", flag.name);
738 success = false;
739 }
740 if (flag.deprecated_in.is_undefined() &&
741 flag.obsolete_in.is_undefined()) {
742 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
743 success = false;
744 }
745
746 if (!flag.deprecated_in.is_undefined()) {
747 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
748 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
749 success = false;
750 }
751
752 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
753 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
754 success = false;
755 }
756 }
757
758 if (!flag.obsolete_in.is_undefined()) {
759 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
760 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
761 success = false;
762 }
763
764 // if flag has become obsolete it should not have a "globals" flag defined anymore.
765 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
766 if (JVMFlag::find_flag(flag.name) != NULL) {
767 // Temporarily disable the warning: 8196739
768 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
769 }
770 }
771 }
772
773 if (!flag.expired_in.is_undefined()) {
774 // if flag has become expired it should not have a "globals" flag defined anymore.
775 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
776 if (JVMFlag::find_flag(flag.name) != NULL) {
777 // Temporarily disable the warning: 8196739
778 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
779 }
780 }
781 }
782
783 }
784 return success;
785 }
786 #endif
787
788 // Parses a size specification string.
789 bool Arguments::atojulong(const char *s, julong* result) {
790 julong n = 0;
791
792 // First char must be a digit. Don't allow negative numbers or leading spaces.
793 if (!isdigit(*s)) {
794 return false;
795 }
796
797 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
798 char* remainder;
799 errno = 0;
800 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
801 if (errno != 0) {
802 return false;
803 }
804
805 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
806 if (remainder == s || strlen(remainder) > 1) {
807 return false;
808 }
809
810 switch (*remainder) {
811 case 'T': case 't':
812 *result = n * G * K;
813 // Check for overflow.
814 if (*result/((julong)G * K) != n) return false;
815 return true;
816 case 'G': case 'g':
817 *result = n * G;
818 if (*result/G != n) return false;
819 return true;
820 case 'M': case 'm':
821 *result = n * M;
822 if (*result/M != n) return false;
823 return true;
824 case 'K': case 'k':
825 *result = n * K;
826 if (*result/K != n) return false;
827 return true;
828 case '\0':
829 *result = n;
830 return true;
831 default:
832 return false;
833 }
834 }
835
836 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
837 if (size < min_size) return arg_too_small;
838 if (size > max_size) return arg_too_big;
839 return arg_in_range;
840 }
841
842 // Describe an argument out of range error
843 void Arguments::describe_range_error(ArgsRange errcode) {
844 switch(errcode) {
845 case arg_too_big:
846 jio_fprintf(defaultStream::error_stream(),
847 "The specified size exceeds the maximum "
848 "representable size.\n");
849 break;
850 case arg_too_small:
851 case arg_unreadable:
852 case arg_in_range:
853 // do nothing for now
854 break;
855 default:
856 ShouldNotReachHere();
857 }
858 }
859
860 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
861 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
862 return true;
863 } else {
864 return false;
865 }
866 }
867
868 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
869 char* end;
870 errno = 0;
871 double v = strtod(value, &end);
872 if ((errno != 0) || (*end != 0)) {
873 return false;
874 }
875
876 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
877 return true;
878 }
879 return false;
880 }
881
882 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
883 julong v;
884 int int_v;
885 intx intx_v;
886 bool is_neg = false;
887 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
888
889 if (result == NULL) {
890 return false;
891 }
892
893 // Check the sign first since atojulong() parses only unsigned values.
894 if (*value == '-') {
895 if (!result->is_intx() && !result->is_int()) {
896 return false;
897 }
898 value++;
899 is_neg = true;
900 }
901 if (!Arguments::atojulong(value, &v)) {
902 return false;
903 }
904 if (result->is_int()) {
905 int_v = (int) v;
906 if (is_neg) {
907 int_v = -int_v;
908 }
909 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
910 } else if (result->is_uint()) {
911 uint uint_v = (uint) v;
912 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
913 } else if (result->is_intx()) {
914 intx_v = (intx) v;
915 if (is_neg) {
916 intx_v = -intx_v;
917 }
918 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
919 } else if (result->is_uintx()) {
920 uintx uintx_v = (uintx) v;
921 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
922 } else if (result->is_uint64_t()) {
923 uint64_t uint64_t_v = (uint64_t) v;
924 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
925 } else if (result->is_size_t()) {
926 size_t size_t_v = (size_t) v;
927 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
928 } else if (result->is_double()) {
929 double double_v = (double) v;
930 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
931 } else {
932 return false;
933 }
934 }
935
936 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
937 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
938 // Contract: JVMFlag always returns a pointer that needs freeing.
939 FREE_C_HEAP_ARRAY(char, value);
940 return true;
941 }
942
943 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
944 const char* old_value = "";
945 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
946 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
947 size_t new_len = strlen(new_value);
948 const char* value;
949 char* free_this_too = NULL;
950 if (old_len == 0) {
951 value = new_value;
952 } else if (new_len == 0) {
953 value = old_value;
954 } else {
955 size_t length = old_len + 1 + new_len + 1;
956 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
957 // each new setting adds another LINE to the switch:
958 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
959 value = buf;
960 free_this_too = buf;
961 }
962 (void) JVMFlag::ccstrAtPut(name, &value, origin);
963 // JVMFlag always returns a pointer that needs freeing.
964 FREE_C_HEAP_ARRAY(char, value);
965 if (free_this_too != NULL) {
966 // JVMFlag made its own copy, so I must delete my own temp. buffer.
967 FREE_C_HEAP_ARRAY(char, free_this_too);
968 }
969 return true;
970 }
971
972 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
973 const char* real_name = real_flag_name(arg);
974 JDK_Version since = JDK_Version();
975 switch (is_deprecated_flag(arg, &since)) {
976 case -1:
977 return NULL; // obsolete or expired, don't process normally
978 case 0:
979 return real_name;
980 case 1: {
981 if (warn) {
982 char version[256];
983 since.to_string(version, sizeof(version));
984 if (real_name != arg) {
985 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
986 arg, version, real_name);
987 } else {
988 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
989 arg, version);
990 }
991 }
992 return real_name;
993 }
994 }
995 ShouldNotReachHere();
996 return NULL;
997 }
998
999 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1000 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1001 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1002 const int max_tagset_size = 256;
1003 int max_tagset_len = max_tagset_size - 1;
1004 char tagset_buffer[max_tagset_size];
1005 tagset_buffer[0] = '\0';
1006
1007 // Write tag-set for aliased logging option, in string list form
1008 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1009 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1010 if (i > 0) {
1011 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1012 }
1013 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1014 }
1015 if (!alf.exactMatch) {
1016 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1017 }
1018 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1019 (on) ? "+" : "-",
1020 name,
1021 tagset_buffer,
1022 (on) ? LogLevel::name(alf.level) : "off");
1023 }
1024
1025 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1026 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1027 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1028 if (strcmp(alf.alias_name, name) == 0) {
1029 log_deprecated_flag(name, on, alf);
1030 return alf;
1031 }
1032 }
1033 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1034 return a;
1035 }
1036
1037 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1038
1039 // range of acceptable characters spelled out for portability reasons
1040 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1041 #define BUFLEN 255
1042 char name[BUFLEN+1];
1043 char dummy;
1044 const char* real_name;
1045 bool warn_if_deprecated = true;
1046
1047 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1048 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1049 if (alf.alias_name != NULL){
1050 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1051 return true;
1052 }
1053 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1054 if (real_name == NULL) {
1055 return false;
1056 }
1057 return set_bool_flag(real_name, false, origin);
1058 }
1059 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1060 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1061 if (alf.alias_name != NULL){
1062 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1063 return true;
1064 }
1065 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1066 if (real_name == NULL) {
1067 return false;
1068 }
1069 return set_bool_flag(real_name, true, origin);
1070 }
1071
1072 char punct;
1073 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1074 const char* value = strchr(arg, '=') + 1;
1075 JVMFlag* flag;
1076
1077 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1078 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1079 if (alf.alias_name != NULL) {
1080 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1081 return true;
1082 }
1083 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1084 if (real_name == NULL) {
1085 return false;
1086 }
1087 flag = JVMFlag::find_flag(real_name);
1088 if (flag != NULL && flag->is_ccstr()) {
1089 if (flag->ccstr_accumulates()) {
1090 return append_to_string_flag(real_name, value, origin);
1091 } else {
1092 if (value[0] == '\0') {
1093 value = NULL;
1094 }
1095 return set_string_flag(real_name, value, origin);
1096 }
1097 } else {
1098 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1099 }
1100 }
1101
1102 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1103 const char* value = strchr(arg, '=') + 1;
1104 // -XX:Foo:=xxx will reset the string flag to the given value.
1105 if (value[0] == '\0') {
1106 value = NULL;
1107 }
1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1109 if (real_name == NULL) {
1110 return false;
1111 }
1112 return set_string_flag(real_name, value, origin);
1113 }
1114
1115 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1116 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1117 #define NUMBER_RANGE "[0123456789eE+-]"
1118 char value[BUFLEN + 1];
1119 char value2[BUFLEN + 1];
1120 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1121 // Looks like a floating-point number -- try again with more lenient format string
1122 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1123 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1124 if (real_name == NULL) {
1125 return false;
1126 }
1127 return set_fp_numeric_flag(real_name, value, origin);
1128 }
1129 }
1130
1131 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1132 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1133 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1134 if (real_name == NULL) {
1135 return false;
1136 }
1137 return set_numeric_flag(real_name, value, origin);
1138 }
1139
1140 return false;
1141 }
1142
1143 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1144 assert(bldarray != NULL, "illegal argument");
1145
1146 if (arg == NULL) {
1147 return;
1148 }
1149
1150 int new_count = *count + 1;
1151
1152 // expand the array and add arg to the last element
1153 if (*bldarray == NULL) {
1154 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1155 } else {
1156 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1157 }
1158 (*bldarray)[*count] = os::strdup_check_oom(arg);
1159 *count = new_count;
1160 }
1161
1162 void Arguments::build_jvm_args(const char* arg) {
1163 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1164 }
1165
1166 void Arguments::build_jvm_flags(const char* arg) {
1167 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1168 }
1169
1170 // utility function to return a string that concatenates all
1171 // strings in a given char** array
1172 const char* Arguments::build_resource_string(char** args, int count) {
1173 if (args == NULL || count == 0) {
1174 return NULL;
1175 }
1176 size_t length = 0;
1177 for (int i = 0; i < count; i++) {
1178 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1179 }
1180 char* s = NEW_RESOURCE_ARRAY(char, length);
1181 char* dst = s;
1182 for (int j = 0; j < count; j++) {
1183 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1184 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1185 dst += offset;
1186 length -= offset;
1187 }
1188 return (const char*) s;
1189 }
1190
1191 void Arguments::print_on(outputStream* st) {
1192 st->print_cr("VM Arguments:");
1193 if (num_jvm_flags() > 0) {
1194 st->print("jvm_flags: "); print_jvm_flags_on(st);
1195 st->cr();
1196 }
1197 if (num_jvm_args() > 0) {
1198 st->print("jvm_args: "); print_jvm_args_on(st);
1199 st->cr();
1200 }
1201 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1202 if (_java_class_path != NULL) {
1203 char* path = _java_class_path->value();
1204 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1205 }
1206 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1207 }
1208
1209 void Arguments::print_summary_on(outputStream* st) {
1210 // Print the command line. Environment variables that are helpful for
1211 // reproducing the problem are written later in the hs_err file.
1212 // flags are from setting file
1213 if (num_jvm_flags() > 0) {
1214 st->print_raw("Settings File: ");
1215 print_jvm_flags_on(st);
1216 st->cr();
1217 }
1218 // args are the command line and environment variable arguments.
1219 st->print_raw("Command Line: ");
1220 if (num_jvm_args() > 0) {
1221 print_jvm_args_on(st);
1222 }
1223 // this is the classfile and any arguments to the java program
1224 if (java_command() != NULL) {
1225 st->print("%s", java_command());
1226 }
1227 st->cr();
1228 }
1229
1230 void Arguments::print_jvm_flags_on(outputStream* st) {
1231 if (_num_jvm_flags > 0) {
1232 for (int i=0; i < _num_jvm_flags; i++) {
1233 st->print("%s ", _jvm_flags_array[i]);
1234 }
1235 }
1236 }
1237
1238 void Arguments::print_jvm_args_on(outputStream* st) {
1239 if (_num_jvm_args > 0) {
1240 for (int i=0; i < _num_jvm_args; i++) {
1241 st->print("%s ", _jvm_args_array[i]);
1242 }
1243 }
1244 }
1245
1246 bool Arguments::process_argument(const char* arg,
1247 jboolean ignore_unrecognized,
1248 JVMFlag::Flags origin) {
1249 JDK_Version since = JDK_Version();
1250
1251 if (parse_argument(arg, origin)) {
1252 return true;
1253 }
1254
1255 // Determine if the flag has '+', '-', or '=' characters.
1256 bool has_plus_minus = (*arg == '+' || *arg == '-');
1257 const char* const argname = has_plus_minus ? arg + 1 : arg;
1258
1259 size_t arg_len;
1260 const char* equal_sign = strchr(argname, '=');
1261 if (equal_sign == NULL) {
1262 arg_len = strlen(argname);
1263 } else {
1264 arg_len = equal_sign - argname;
1265 }
1266
1267 // Only make the obsolete check for valid arguments.
1268 if (arg_len <= BUFLEN) {
1269 // Construct a string which consists only of the argument name without '+', '-', or '='.
1270 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1271 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1272 if (is_obsolete_flag(stripped_argname, &since)) {
1273 if (strcmp(stripped_argname, "UseAppCDS") != 0) {
1274 char version[256];
1275 since.to_string(version, sizeof(version));
1276 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1277 } else {
1278 warning("Ignoring obsolete option UseAppCDS; AppCDS is automatically enabled");
1279 }
1280 return true;
1281 }
1282 #ifndef PRODUCT
1283 else {
1284 const char* replacement;
1285 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1286 log_warning(arguments)("%s has been removed. Please use %s instead.",
1287 stripped_argname,
1288 replacement);
1289 return false;
1290 }
1291 }
1292 #endif //PRODUCT
1293 }
1294
1295 // For locked flags, report a custom error message if available.
1296 // Otherwise, report the standard unrecognized VM option.
1297 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1298 if (found_flag != NULL) {
1299 char locked_message_buf[BUFLEN];
1300 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1301 if (strlen(locked_message_buf) == 0) {
1302 if (found_flag->is_bool() && !has_plus_minus) {
1303 jio_fprintf(defaultStream::error_stream(),
1304 "Missing +/- setting for VM option '%s'\n", argname);
1305 } else if (!found_flag->is_bool() && has_plus_minus) {
1306 jio_fprintf(defaultStream::error_stream(),
1307 "Unexpected +/- setting in VM option '%s'\n", argname);
1308 } else {
1309 jio_fprintf(defaultStream::error_stream(),
1310 "Improperly specified VM option '%s'\n", argname);
1311 }
1312 } else {
1313 #ifdef PRODUCT
1314 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1315 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1316 if (ignore_unrecognized && mismatched) {
1317 return true;
1318 }
1319 #endif
1320 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1321 }
1322 } else {
1323 if (ignore_unrecognized) {
1324 return true;
1325 }
1326 jio_fprintf(defaultStream::error_stream(),
1327 "Unrecognized VM option '%s'\n", argname);
1328 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1329 if (fuzzy_matched != NULL) {
1330 jio_fprintf(defaultStream::error_stream(),
1331 "Did you mean '%s%s%s'? ",
1332 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1333 fuzzy_matched->_name,
1334 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1335 }
1336 }
1337
1338 // allow for commandline "commenting out" options like -XX:#+Verbose
1339 return arg[0] == '#';
1340 }
1341
1342 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1343 FILE* stream = fopen(file_name, "rb");
1344 if (stream == NULL) {
1345 if (should_exist) {
1346 jio_fprintf(defaultStream::error_stream(),
1347 "Could not open settings file %s\n", file_name);
1348 return false;
1349 } else {
1350 return true;
1351 }
1352 }
1353
1354 char token[1024];
1355 int pos = 0;
1356
1357 bool in_white_space = true;
1358 bool in_comment = false;
1359 bool in_quote = false;
1360 char quote_c = 0;
1361 bool result = true;
1362
1363 int c = getc(stream);
1364 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1365 if (in_white_space) {
1366 if (in_comment) {
1367 if (c == '\n') in_comment = false;
1368 } else {
1369 if (c == '#') in_comment = true;
1370 else if (!isspace(c)) {
1371 in_white_space = false;
1372 token[pos++] = c;
1373 }
1374 }
1375 } else {
1376 if (c == '\n' || (!in_quote && isspace(c))) {
1377 // token ends at newline, or at unquoted whitespace
1378 // this allows a way to include spaces in string-valued options
1379 token[pos] = '\0';
1380 logOption(token);
1381 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1382 build_jvm_flags(token);
1383 pos = 0;
1384 in_white_space = true;
1385 in_quote = false;
1386 } else if (!in_quote && (c == '\'' || c == '"')) {
1387 in_quote = true;
1388 quote_c = c;
1389 } else if (in_quote && (c == quote_c)) {
1390 in_quote = false;
1391 } else {
1392 token[pos++] = c;
1393 }
1394 }
1395 c = getc(stream);
1396 }
1397 if (pos > 0) {
1398 token[pos] = '\0';
1399 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1400 build_jvm_flags(token);
1401 }
1402 fclose(stream);
1403 return result;
1404 }
1405
1406 //=============================================================================================================
1407 // Parsing of properties (-D)
1408
1409 const char* Arguments::get_property(const char* key) {
1410 return PropertyList_get_value(system_properties(), key);
1411 }
1412
1413 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1414 const char* eq = strchr(prop, '=');
1415 const char* key;
1416 const char* value = "";
1417
1418 if (eq == NULL) {
1419 // property doesn't have a value, thus use passed string
1420 key = prop;
1421 } else {
1422 // property have a value, thus extract it and save to the
1423 // allocated string
1424 size_t key_len = eq - prop;
1425 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1426
1427 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1428 key = tmp_key;
1429
1430 value = &prop[key_len + 1];
1431 }
1432
1433 if (strcmp(key, "java.compiler") == 0) {
1434 process_java_compiler_argument(value);
1435 // Record value in Arguments, but let it get passed to Java.
1436 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1437 strcmp(key, "sun.java.launcher.pid") == 0) {
1438 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1439 // private and are processed in process_sun_java_launcher_properties();
1440 // the sun.java.launcher property is passed on to the java application
1441 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1442 // append is true, writable is true, internal is false
1443 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1444 WriteableProperty, ExternalProperty);
1445 } else {
1446 if (strcmp(key, "sun.java.command") == 0) {
1447 char *old_java_command = _java_command;
1448 _java_command = os::strdup_check_oom(value, mtArguments);
1449 if (old_java_command != NULL) {
1450 os::free(old_java_command);
1451 }
1452 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1453 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1454 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1455 // its value without going through the property list or making a Java call.
1456 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1457 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1458 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1459 os::free((void *)old_java_vendor_url_bug);
1460 }
1461 }
1462
1463 // Create new property and add at the end of the list
1464 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1465 }
1466
1467 if (key != prop) {
1468 // SystemProperty copy passed value, thus free previously allocated
1469 // memory
1470 FreeHeap((void *)key);
1471 }
1472
1473 return true;
1474 }
1475
1476 #if INCLUDE_CDS
1477 const char* unsupported_properties[] = { "jdk.module.limitmods",
1478 "jdk.module.upgrade.path",
1479 "jdk.module.patch.0" };
1480 const char* unsupported_options[] = { "--limit-modules",
1481 "--upgrade-module-path",
1482 "--patch-module"
1483 };
1484 void Arguments::check_unsupported_dumping_properties() {
1485 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1486 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1487 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1488 SystemProperty* sp = system_properties();
1489 while (sp != NULL) {
1490 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1491 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1492 vm_exit_during_initialization(
1493 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1494 }
1495 }
1496 sp = sp->next();
1497 }
1498
1499 // Check for an exploded module build in use with -Xshare:dump.
1500 if (!has_jimage()) {
1501 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1502 }
1503 }
1504
1505 bool Arguments::check_unsupported_cds_runtime_properties() {
1506 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1507 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1508 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1509 if (get_property(unsupported_properties[i]) != NULL) {
1510 if (RequireSharedSpaces) {
1511 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1512 }
1513 return true;
1514 }
1515 }
1516 return false;
1517 }
1518 #endif
1519
1520 //===========================================================================================================
1521 // Setting int/mixed/comp mode flags
1522
1523 void Arguments::set_mode_flags(Mode mode) {
1524 // Set up default values for all flags.
1525 // If you add a flag to any of the branches below,
1526 // add a default value for it here.
1527 set_java_compiler(false);
1528 _mode = mode;
1529
1530 // Ensure Agent_OnLoad has the correct initial values.
1531 // This may not be the final mode; mode may change later in onload phase.
1532 PropertyList_unique_add(&_system_properties, "java.vm.info",
1533 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1534
1535 UseInterpreter = true;
1536 UseCompiler = true;
1537 UseLoopCounter = true;
1538
1539 // Default values may be platform/compiler dependent -
1540 // use the saved values
1541 ClipInlining = Arguments::_ClipInlining;
1542 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1543 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1544 BackgroundCompilation = Arguments::_BackgroundCompilation;
1545 if (TieredCompilation) {
1546 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1547 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1548 }
1549 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1550 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1551 }
1552 }
1553
1554 // Change from defaults based on mode
1555 switch (mode) {
1556 default:
1557 ShouldNotReachHere();
1558 break;
1559 case _int:
1560 UseCompiler = false;
1561 UseLoopCounter = false;
1562 AlwaysCompileLoopMethods = false;
1563 UseOnStackReplacement = false;
1564 break;
1565 case _mixed:
1566 // same as default
1567 break;
1568 case _comp:
1569 UseInterpreter = false;
1570 BackgroundCompilation = false;
1571 ClipInlining = false;
1572 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1573 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1574 // compile a level 4 (C2) and then continue executing it.
1575 if (TieredCompilation) {
1576 Tier3InvokeNotifyFreqLog = 0;
1577 Tier4InvocationThreshold = 0;
1578 }
1579 break;
1580 }
1581 }
1582
1583 // Conflict: required to use shared spaces (-Xshare:on), but
1584 // incompatible command line options were chosen.
1585 static void no_shared_spaces(const char* message) {
1586 if (RequireSharedSpaces) {
1587 jio_fprintf(defaultStream::error_stream(),
1588 "Class data sharing is inconsistent with other specified options.\n");
1589 vm_exit_during_initialization("Unable to use shared archive.", message);
1590 } else {
1591 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1592 }
1593 }
1594
1595 // Returns threshold scaled with the value of scale.
1596 // If scale < 0.0, threshold is returned without scaling.
1597 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1598 if (scale == 1.0 || scale < 0.0) {
1599 return threshold;
1600 } else {
1601 return (intx)(threshold * scale);
1602 }
1603 }
1604
1605 // Returns freq_log scaled with the value of scale.
1606 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1607 // If scale < 0.0, freq_log is returned without scaling.
1608 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1609 // Check if scaling is necessary or if negative value was specified.
1610 if (scale == 1.0 || scale < 0.0) {
1611 return freq_log;
1612 }
1613 // Check values to avoid calculating log2 of 0.
1614 if (scale == 0.0 || freq_log == 0) {
1615 return 0;
1616 }
1617 // Determine the maximum notification frequency value currently supported.
1618 // The largest mask value that the interpreter/C1 can handle is
1619 // of length InvocationCounter::number_of_count_bits. Mask values are always
1620 // one bit shorter then the value of the notification frequency. Set
1621 // max_freq_bits accordingly.
1622 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1623 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1624 if (scaled_freq == 0) {
1625 // Return 0 right away to avoid calculating log2 of 0.
1626 return 0;
1627 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1628 return max_freq_bits;
1629 } else {
1630 return log2_intptr(scaled_freq);
1631 }
1632 }
1633
1634 void Arguments::set_tiered_flags() {
1635 // With tiered, set default policy to SimpleThresholdPolicy, which is 2.
1636 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1637 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1638 }
1639 if (CompilationPolicyChoice < 2) {
1640 vm_exit_during_initialization(
1641 "Incompatible compilation policy selected", NULL);
1642 }
1643 // Increase the code cache size - tiered compiles a lot more.
1644 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1645 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1646 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1647 }
1648 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1649 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1650 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1651 }
1652 if (!UseInterpreter) { // -Xcomp
1653 Tier3InvokeNotifyFreqLog = 0;
1654 Tier4InvocationThreshold = 0;
1655 }
1656
1657 if (CompileThresholdScaling < 0) {
1658 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1659 }
1660
1661 // Scale tiered compilation thresholds.
1662 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1663 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1664 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1665 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1666
1667 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1668 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1669 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1670 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1671
1672 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1673 // once these thresholds become supported.
1674
1675 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1676 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1677
1678 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1679 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1680
1681 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1682
1683 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1684 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1685 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1686 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1687 }
1688 }
1689
1690 void set_object_alignment() {
1691 // Object alignment.
1692 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1693 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1694 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1695 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1696 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1697 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1698
1699 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1700 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1701
1702 // Oop encoding heap max
1703 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1704
1705 if (SurvivorAlignmentInBytes == 0) {
1706 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1707 }
1708 }
1709
1710 size_t Arguments::max_heap_for_compressed_oops() {
1711 // Avoid sign flip.
1712 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1713 // We need to fit both the NULL page and the heap into the memory budget, while
1714 // keeping alignment constraints of the heap. To guarantee the latter, as the
1715 // NULL page is located before the heap, we pad the NULL page to the conservative
1716 // maximum alignment that the GC may ever impose upon the heap.
1717 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1718 _conservative_max_heap_alignment);
1719
1720 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1721 NOT_LP64(ShouldNotReachHere(); return 0);
1722 }
1723
1724 void Arguments::set_use_compressed_oops() {
1725 #ifndef ZERO
1726 #ifdef _LP64
1727 // MaxHeapSize is not set up properly at this point, but
1728 // the only value that can override MaxHeapSize if we are
1729 // to use UseCompressedOops is InitialHeapSize.
1730 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1731
1732 if (max_heap_size <= max_heap_for_compressed_oops()) {
1733 #if !defined(COMPILER1) || defined(TIERED)
1734 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1735 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1736 }
1737 #endif
1738 } else {
1739 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1740 warning("Max heap size too large for Compressed Oops");
1741 FLAG_SET_DEFAULT(UseCompressedOops, false);
1742 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1743 }
1744 }
1745 #endif // _LP64
1746 #endif // ZERO
1747 }
1748
1749
1750 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1751 // set_use_compressed_oops().
1752 void Arguments::set_use_compressed_klass_ptrs() {
1753 #ifndef ZERO
1754 #ifdef _LP64
1755 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1756 if (!UseCompressedOops) {
1757 if (UseCompressedClassPointers) {
1758 warning("UseCompressedClassPointers requires UseCompressedOops");
1759 }
1760 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1761 } else {
1762 // Turn on UseCompressedClassPointers too
1763 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1764 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1765 }
1766 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1767 if (UseCompressedClassPointers) {
1768 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1769 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1770 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1771 }
1772 }
1773 }
1774 #endif // _LP64
1775 #endif // !ZERO
1776 }
1777
1778 void Arguments::set_conservative_max_heap_alignment() {
1779 // The conservative maximum required alignment for the heap is the maximum of
1780 // the alignments imposed by several sources: any requirements from the heap
1781 // itself, the collector policy and the maximum page size we may run the VM
1782 // with.
1783 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1784 _conservative_max_heap_alignment = MAX4(heap_alignment,
1785 (size_t)os::vm_allocation_granularity(),
1786 os::max_page_size(),
1787 CollectorPolicy::compute_heap_alignment());
1788 }
1789
1790 #ifdef TIERED
1791 bool Arguments::compilation_mode_selected() {
1792 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1793 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1794
1795 }
1796
1797 void Arguments::select_compilation_mode_ergonomically() {
1798 #if defined(_WINDOWS) && !defined(_LP64)
1799 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1800 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1801 }
1802 #endif
1803 if (NeverActAsServerClassMachine) {
1804 set_client_compilation_mode();
1805 }
1806 }
1807 #endif //TIERED
1808
1809 #if INCLUDE_JVMCI
1810 void Arguments::set_jvmci_specific_flags() {
1811 if (UseJVMCICompiler) {
1812 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1813 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1814 }
1815 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1816 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1817 }
1818 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1819 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1820 }
1821 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1822 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1823 }
1824 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1825 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1826 }
1827 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1828 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1829 }
1830 if (TieredStopAtLevel != CompLevel_full_optimization) {
1831 // Currently JVMCI compiler can only work at the full optimization level
1832 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1833 TieredStopAtLevel = CompLevel_full_optimization;
1834 }
1835 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1836 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1837 }
1838 }
1839 }
1840 #endif
1841
1842 jint Arguments::set_ergonomics_flags() {
1843 #ifdef TIERED
1844 if (!compilation_mode_selected()) {
1845 select_compilation_mode_ergonomically();
1846 }
1847 #endif
1848
1849 GCConfig::initialize();
1850
1851 #if defined(IA32)
1852 // Only server compiler can optimize safepoints well enough.
1853 if (!is_server_compilation_mode_vm()) {
1854 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1855 }
1856 #endif
1857
1858 set_conservative_max_heap_alignment();
1859
1860 #ifndef ZERO
1861 #ifdef _LP64
1862 set_use_compressed_oops();
1863
1864 // set_use_compressed_klass_ptrs() must be called after calling
1865 // set_use_compressed_oops().
1866 set_use_compressed_klass_ptrs();
1867
1868 // Also checks that certain machines are slower with compressed oops
1869 // in vm_version initialization code.
1870 #endif // _LP64
1871 #endif // !ZERO
1872
1873 return JNI_OK;
1874 }
1875
1876 julong Arguments::limit_by_allocatable_memory(julong limit) {
1877 julong max_allocatable;
1878 julong result = limit;
1879 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1880 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1881 }
1882 return result;
1883 }
1884
1885 // Use static initialization to get the default before parsing
1886 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1887
1888 void Arguments::set_heap_size() {
1889 julong phys_mem =
1890 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1891 : (julong)MaxRAM;
1892
1893 // Convert deprecated flags
1894 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1895 !FLAG_IS_DEFAULT(MaxRAMFraction))
1896 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1897
1898 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1899 !FLAG_IS_DEFAULT(MinRAMFraction))
1900 MinRAMPercentage = 100.0 / MinRAMFraction;
1901
1902 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1903 !FLAG_IS_DEFAULT(InitialRAMFraction))
1904 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1905
1906 // If the maximum heap size has not been set with -Xmx,
1907 // then set it as fraction of the size of physical memory,
1908 // respecting the maximum and minimum sizes of the heap.
1909 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1910 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1911 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1912 if (reasonable_min < MaxHeapSize) {
1913 // Small physical memory, so use a minimum fraction of it for the heap
1914 reasonable_max = reasonable_min;
1915 } else {
1916 // Not-small physical memory, so require a heap at least
1917 // as large as MaxHeapSize
1918 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1919 }
1920
1921 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1922 // Limit the heap size to ErgoHeapSizeLimit
1923 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1924 }
1925 if (UseCompressedOops) {
1926 // Limit the heap size to the maximum possible when using compressed oops
1927 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1928
1929 // HeapBaseMinAddress can be greater than default but not less than.
1930 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1931 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1932 // matches compressed oops printing flags
1933 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1934 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1935 DefaultHeapBaseMinAddress,
1936 DefaultHeapBaseMinAddress/G,
1937 HeapBaseMinAddress);
1938 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1939 }
1940 }
1941
1942 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1943 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1944 // but it should be not less than default MaxHeapSize.
1945 max_coop_heap -= HeapBaseMinAddress;
1946 }
1947 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1948 }
1949 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1950
1951 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1952 // An initial heap size was specified on the command line,
1953 // so be sure that the maximum size is consistent. Done
1954 // after call to limit_by_allocatable_memory because that
1955 // method might reduce the allocation size.
1956 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1957 }
1958
1959 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1960 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1961 }
1962
1963 // If the minimum or initial heap_size have not been set or requested to be set
1964 // ergonomically, set them accordingly.
1965 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1966 julong reasonable_minimum = (julong)(OldSize + NewSize);
1967
1968 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1969
1970 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1971
1972 if (InitialHeapSize == 0) {
1973 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1974
1975 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1976 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1977
1978 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1979
1980 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1981 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1982 }
1983 // If the minimum heap size has not been set (via -Xms),
1984 // synchronize with InitialHeapSize to avoid errors with the default value.
1985 if (min_heap_size() == 0) {
1986 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1987 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1988 }
1989 }
1990 }
1991
1992 // This option inspects the machine and attempts to set various
1993 // parameters to be optimal for long-running, memory allocation
1994 // intensive jobs. It is intended for machines with large
1995 // amounts of cpu and memory.
1996 jint Arguments::set_aggressive_heap_flags() {
1997 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1998 // VM, but we may not be able to represent the total physical memory
1999 // available (like having 8gb of memory on a box but using a 32bit VM).
2000 // Thus, we need to make sure we're using a julong for intermediate
2001 // calculations.
2002 julong initHeapSize;
2003 julong total_memory = os::physical_memory();
2004
2005 if (total_memory < (julong) 256 * M) {
2006 jio_fprintf(defaultStream::error_stream(),
2007 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2008 vm_exit(1);
2009 }
2010
2011 // The heap size is half of available memory, or (at most)
2012 // all of possible memory less 160mb (leaving room for the OS
2013 // when using ISM). This is the maximum; because adaptive sizing
2014 // is turned on below, the actual space used may be smaller.
2015
2016 initHeapSize = MIN2(total_memory / (julong) 2,
2017 total_memory - (julong) 160 * M);
2018
2019 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2020
2021 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2022 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
2023 return JNI_EINVAL;
2024 }
2025 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
2026 return JNI_EINVAL;
2027 }
2028 // Currently the minimum size and the initial heap sizes are the same.
2029 set_min_heap_size(initHeapSize);
2030 }
2031 if (FLAG_IS_DEFAULT(NewSize)) {
2032 // Make the young generation 3/8ths of the total heap.
2033 if (FLAG_SET_CMDLINE(size_t, NewSize,
2034 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
2035 return JNI_EINVAL;
2036 }
2037 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
2038 return JNI_EINVAL;
2039 }
2040 }
2041
2042 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2043 FLAG_SET_DEFAULT(UseLargePages, true);
2044 #endif
2045
2046 // Increase some data structure sizes for efficiency
2047 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
2048 return JNI_EINVAL;
2049 }
2050 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
2051 return JNI_EINVAL;
2052 }
2053 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
2054 return JNI_EINVAL;
2055 }
2056
2057 // See the OldPLABSize comment below, but replace 'after promotion'
2058 // with 'after copying'. YoungPLABSize is the size of the survivor
2059 // space per-gc-thread buffers. The default is 4kw.
2060 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2061 return JNI_EINVAL;
2062 }
2063
2064 // OldPLABSize is the size of the buffers in the old gen that
2065 // UseParallelGC uses to promote live data that doesn't fit in the
2066 // survivor spaces. At any given time, there's one for each gc thread.
2067 // The default size is 1kw. These buffers are rarely used, since the
2068 // survivor spaces are usually big enough. For specjbb, however, there
2069 // are occasions when there's lots of live data in the young gen
2070 // and we end up promoting some of it. We don't have a definite
2071 // explanation for why bumping OldPLABSize helps, but the theory
2072 // is that a bigger PLAB results in retaining something like the
2073 // original allocation order after promotion, which improves mutator
2074 // locality. A minor effect may be that larger PLABs reduce the
2075 // number of PLAB allocation events during gc. The value of 8kw
2076 // was arrived at by experimenting with specjbb.
2077 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2078 return JNI_EINVAL;
2079 }
2080
2081 // Enable parallel GC and adaptive generation sizing
2082 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
2083 return JNI_EINVAL;
2084 }
2085
2086 // Encourage steady state memory management
2087 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
2088 return JNI_EINVAL;
2089 }
2090
2091 // This appears to improve mutator locality
2092 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2093 return JNI_EINVAL;
2094 }
2095
2096 // Get around early Solaris scheduling bug
2097 // (affinity vs other jobs on system)
2098 // but disallow DR and offlining (5008695).
2099 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
2100 return JNI_EINVAL;
2101 }
2102
2103 return JNI_OK;
2104 }
2105
2106 // This must be called after ergonomics.
2107 void Arguments::set_bytecode_flags() {
2108 if (!RewriteBytecodes) {
2109 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2110 }
2111 }
2112
2113 // Aggressive optimization flags -XX:+AggressiveOpts
2114 jint Arguments::set_aggressive_opts_flags() {
2115 #ifdef COMPILER2
2116 if (AggressiveUnboxing) {
2117 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2118 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2119 } else if (!EliminateAutoBox) {
2120 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2121 AggressiveUnboxing = false;
2122 }
2123 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2124 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2125 } else if (!DoEscapeAnalysis) {
2126 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2127 AggressiveUnboxing = false;
2128 }
2129 }
2130 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2131 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2132 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2133 }
2134 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2135 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2136 }
2137
2138 // Feed the cache size setting into the JDK
2139 char buffer[1024];
2140 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2141 if (!add_property(buffer)) {
2142 return JNI_ENOMEM;
2143 }
2144 }
2145 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2146 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2147 }
2148 #endif
2149
2150 if (AggressiveOpts) {
2151 // Sample flag setting code
2152 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2153 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2154 // }
2155 }
2156
2157 return JNI_OK;
2158 }
2159
2160 //===========================================================================================================
2161 // Parsing of java.compiler property
2162
2163 void Arguments::process_java_compiler_argument(const char* arg) {
2164 // For backwards compatibility, Djava.compiler=NONE or ""
2165 // causes us to switch to -Xint mode UNLESS -Xdebug
2166 // is also specified.
2167 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2168 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2169 }
2170 }
2171
2172 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2173 _sun_java_launcher = os::strdup_check_oom(launcher);
2174 }
2175
2176 bool Arguments::created_by_java_launcher() {
2177 assert(_sun_java_launcher != NULL, "property must have value");
2178 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2179 }
2180
2181 bool Arguments::sun_java_launcher_is_altjvm() {
2182 return _sun_java_launcher_is_altjvm;
2183 }
2184
2185 //===========================================================================================================
2186 // Parsing of main arguments
2187
2188 #if INCLUDE_JVMCI
2189 // Check consistency of jvmci vm argument settings.
2190 bool Arguments::check_jvmci_args_consistency() {
2191 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2192 }
2193 #endif //INCLUDE_JVMCI
2194
2195 // Check the consistency of vm_init_args
2196 bool Arguments::check_vm_args_consistency() {
2197 // Method for adding checks for flag consistency.
2198 // The intent is to warn the user of all possible conflicts,
2199 // before returning an error.
2200 // Note: Needs platform-dependent factoring.
2201 bool status = true;
2202
2203 if (TLABRefillWasteFraction == 0) {
2204 jio_fprintf(defaultStream::error_stream(),
2205 "TLABRefillWasteFraction should be a denominator, "
2206 "not " SIZE_FORMAT "\n",
2207 TLABRefillWasteFraction);
2208 status = false;
2209 }
2210
2211 if (PrintNMTStatistics) {
2212 #if INCLUDE_NMT
2213 if (MemTracker::tracking_level() == NMT_off) {
2214 #endif // INCLUDE_NMT
2215 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2216 PrintNMTStatistics = false;
2217 #if INCLUDE_NMT
2218 }
2219 #endif
2220 }
2221
2222 #if INCLUDE_JVMCI
2223 status = status && check_jvmci_args_consistency();
2224
2225 if (EnableJVMCI) {
2226 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2227 AddProperty, UnwriteableProperty, InternalProperty);
2228
2229 if (!ScavengeRootsInCode) {
2230 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2231 ScavengeRootsInCode = 1;
2232 }
2233 }
2234 #endif
2235
2236 // Check lower bounds of the code cache
2237 // Template Interpreter code is approximately 3X larger in debug builds.
2238 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2239 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2240 jio_fprintf(defaultStream::error_stream(),
2241 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2242 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2243 status = false;
2244 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2245 jio_fprintf(defaultStream::error_stream(),
2246 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2247 min_code_cache_size/K);
2248 status = false;
2249 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2250 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2251 jio_fprintf(defaultStream::error_stream(),
2252 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2253 CODE_CACHE_SIZE_LIMIT/M);
2254 status = false;
2255 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2256 jio_fprintf(defaultStream::error_stream(),
2257 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2258 min_code_cache_size/K);
2259 status = false;
2260 }
2261
2262 #ifdef _LP64
2263 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2264 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2265 }
2266 #endif
2267
2268 #ifndef SUPPORT_RESERVED_STACK_AREA
2269 if (StackReservedPages != 0) {
2270 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2271 warning("Reserved Stack Area not supported on this platform");
2272 }
2273 #endif
2274
2275 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2276 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2277 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2278 }
2279 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2280 }
2281 if (UseCompiler && is_interpreter_only()) {
2282 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2283 warning("UseCompiler disabled due to -Xint.");
2284 }
2285 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2286 }
2287 #ifdef COMPILER2
2288 if (PostLoopMultiversioning && !RangeCheckElimination) {
2289 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2290 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2291 }
2292 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2293 }
2294 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2295 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2296 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2297 }
2298 LoopStripMiningIter = 1;
2299 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2300 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2301 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2302 }
2303 LoopStripMiningIter = 0;
2304 }
2305 #endif
2306 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2307 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2308 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2309 }
2310 }
2311 return status;
2312 }
2313
2314 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2315 const char* option_type) {
2316 if (ignore) return false;
2317
2318 const char* spacer = " ";
2319 if (option_type == NULL) {
2320 option_type = ++spacer; // Set both to the empty string.
2321 }
2322
2323 if (os::obsolete_option(option)) {
2324 jio_fprintf(defaultStream::error_stream(),
2325 "Obsolete %s%soption: %s\n", option_type, spacer,
2326 option->optionString);
2327 return false;
2328 } else {
2329 jio_fprintf(defaultStream::error_stream(),
2330 "Unrecognized %s%soption: %s\n", option_type, spacer,
2331 option->optionString);
2332 return true;
2333 }
2334 }
2335
2336 static const char* user_assertion_options[] = {
2337 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2338 };
2339
2340 static const char* system_assertion_options[] = {
2341 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2342 };
2343
2344 bool Arguments::parse_uintx(const char* value,
2345 uintx* uintx_arg,
2346 uintx min_size) {
2347
2348 // Check the sign first since atojulong() parses only unsigned values.
2349 bool value_is_positive = !(*value == '-');
2350
2351 if (value_is_positive) {
2352 julong n;
2353 bool good_return = atojulong(value, &n);
2354 if (good_return) {
2355 bool above_minimum = n >= min_size;
2356 bool value_is_too_large = n > max_uintx;
2357
2358 if (above_minimum && !value_is_too_large) {
2359 *uintx_arg = n;
2360 return true;
2361 }
2362 }
2363 }
2364 return false;
2365 }
2366
2367 unsigned int addreads_count = 0;
2368 unsigned int addexports_count = 0;
2369 unsigned int addopens_count = 0;
2370 unsigned int addmods_count = 0;
2371 unsigned int patch_mod_count = 0;
2372
2373 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2374 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2375 char* property = AllocateHeap(prop_len, mtArguments);
2376 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2377 if (ret < 0 || ret >= (int)prop_len) {
2378 FreeHeap(property);
2379 return false;
2380 }
2381 bool added = add_property(property, UnwriteableProperty, internal);
2382 FreeHeap(property);
2383 return added;
2384 }
2385
2386 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2387 const unsigned int props_count_limit = 1000;
2388 const int max_digits = 3;
2389 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2390
2391 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2392 if (count < props_count_limit) {
2393 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2394 char* property = AllocateHeap(prop_len, mtArguments);
2395 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2396 if (ret < 0 || ret >= (int)prop_len) {
2397 FreeHeap(property);
2398 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2399 return false;
2400 }
2401 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2402 FreeHeap(property);
2403 return added;
2404 }
2405
2406 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2407 return false;
2408 }
2409
2410 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2411 julong* long_arg,
2412 julong min_size,
2413 julong max_size) {
2414 if (!atojulong(s, long_arg)) return arg_unreadable;
2415 return check_memory_size(*long_arg, min_size, max_size);
2416 }
2417
2418 // Parse JavaVMInitArgs structure
2419
2420 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2421 const JavaVMInitArgs *java_options_args,
2422 const JavaVMInitArgs *cmd_line_args) {
2423 bool patch_mod_javabase = false;
2424
2425 // Save default settings for some mode flags
2426 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2427 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2428 Arguments::_ClipInlining = ClipInlining;
2429 Arguments::_BackgroundCompilation = BackgroundCompilation;
2430 if (TieredCompilation) {
2431 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2432 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2433 }
2434
2435 // Setup flags for mixed which is the default
2436 set_mode_flags(_mixed);
2437
2438 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2439 // variable (if present).
2440 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2441 if (result != JNI_OK) {
2442 return result;
2443 }
2444
2445 // Parse args structure generated from the command line flags.
2446 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2447 if (result != JNI_OK) {
2448 return result;
2449 }
2450
2451 // Parse args structure generated from the _JAVA_OPTIONS environment
2452 // variable (if present) (mimics classic VM)
2453 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2454 if (result != JNI_OK) {
2455 return result;
2456 }
2457
2458 // We need to ensure processor and memory resources have been properly
2459 // configured - which may rely on arguments we just processed - before
2460 // doing the final argument processing. Any argument processing that
2461 // needs to know about processor and memory resources must occur after
2462 // this point.
2463
2464 os::init_container_support();
2465
2466 // Do final processing now that all arguments have been parsed
2467 result = finalize_vm_init_args(patch_mod_javabase);
2468 if (result != JNI_OK) {
2469 return result;
2470 }
2471
2472 return JNI_OK;
2473 }
2474
2475 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2476 // represents a valid JDWP agent. is_path==true denotes that we
2477 // are dealing with -agentpath (case where name is a path), otherwise with
2478 // -agentlib
2479 bool valid_jdwp_agent(char *name, bool is_path) {
2480 char *_name;
2481 const char *_jdwp = "jdwp";
2482 size_t _len_jdwp, _len_prefix;
2483
2484 if (is_path) {
2485 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2486 return false;
2487 }
2488
2489 _name++; // skip past last path separator
2490 _len_prefix = strlen(JNI_LIB_PREFIX);
2491
2492 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2493 return false;
2494 }
2495
2496 _name += _len_prefix;
2497 _len_jdwp = strlen(_jdwp);
2498
2499 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2500 _name += _len_jdwp;
2501 }
2502 else {
2503 return false;
2504 }
2505
2506 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2507 return false;
2508 }
2509
2510 return true;
2511 }
2512
2513 if (strcmp(name, _jdwp) == 0) {
2514 return true;
2515 }
2516
2517 return false;
2518 }
2519
2520 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2521 // --patch-module=<module>=<file>(<pathsep><file>)*
2522 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2523 // Find the equal sign between the module name and the path specification
2524 const char* module_equal = strchr(patch_mod_tail, '=');
2525 if (module_equal == NULL) {
2526 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2527 return JNI_ERR;
2528 } else {
2529 // Pick out the module name
2530 size_t module_len = module_equal - patch_mod_tail;
2531 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2532 if (module_name != NULL) {
2533 memcpy(module_name, patch_mod_tail, module_len);
2534 *(module_name + module_len) = '\0';
2535 // The path piece begins one past the module_equal sign
2536 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2537 FREE_C_HEAP_ARRAY(char, module_name);
2538 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2539 return JNI_ENOMEM;
2540 }
2541 } else {
2542 return JNI_ENOMEM;
2543 }
2544 }
2545 return JNI_OK;
2546 }
2547
2548 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2549 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2550 // The min and max sizes match the values in globals.hpp, but scaled
2551 // with K. The values have been chosen so that alignment with page
2552 // size doesn't change the max value, which makes the conversions
2553 // back and forth between Xss value and ThreadStackSize value easier.
2554 // The values have also been chosen to fit inside a 32-bit signed type.
2555 const julong min_ThreadStackSize = 0;
2556 const julong max_ThreadStackSize = 1 * M;
2557
2558 const julong min_size = min_ThreadStackSize * K;
2559 const julong max_size = max_ThreadStackSize * K;
2560
2561 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2562
2563 julong size = 0;
2564 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2565 if (errcode != arg_in_range) {
2566 bool silent = (option == NULL); // Allow testing to silence error messages
2567 if (!silent) {
2568 jio_fprintf(defaultStream::error_stream(),
2569 "Invalid thread stack size: %s\n", option->optionString);
2570 describe_range_error(errcode);
2571 }
2572 return JNI_EINVAL;
2573 }
2574
2575 // Internally track ThreadStackSize in units of 1024 bytes.
2576 const julong size_aligned = align_up(size, K);
2577 assert(size <= size_aligned,
2578 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2579 size, size_aligned);
2580
2581 const julong size_in_K = size_aligned / K;
2582 assert(size_in_K < (julong)max_intx,
2583 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2584 size_in_K);
2585
2586 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2587 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2588 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2589 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2590 max_expanded, size_in_K);
2591
2592 *out_ThreadStackSize = (intx)size_in_K;
2593
2594 return JNI_OK;
2595 }
2596
2597 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2598 // For match_option to return remaining or value part of option string
2599 const char* tail;
2600
2601 // iterate over arguments
2602 for (int index = 0; index < args->nOptions; index++) {
2603 bool is_absolute_path = false; // for -agentpath vs -agentlib
2604
2605 const JavaVMOption* option = args->options + index;
2606
2607 if (!match_option(option, "-Djava.class.path", &tail) &&
2608 !match_option(option, "-Dsun.java.command", &tail) &&
2609 !match_option(option, "-Dsun.java.launcher", &tail)) {
2610
2611 // add all jvm options to the jvm_args string. This string
2612 // is used later to set the java.vm.args PerfData string constant.
2613 // the -Djava.class.path and the -Dsun.java.command options are
2614 // omitted from jvm_args string as each have their own PerfData
2615 // string constant object.
2616 build_jvm_args(option->optionString);
2617 }
2618
2619 // -verbose:[class/module/gc/jni]
2620 if (match_option(option, "-verbose", &tail)) {
2621 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2622 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2623 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2624 } else if (!strcmp(tail, ":module")) {
2625 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2626 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2627 } else if (!strcmp(tail, ":gc")) {
2628 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2629 } else if (!strcmp(tail, ":jni")) {
2630 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2631 return JNI_EINVAL;
2632 }
2633 }
2634 // -da / -ea / -disableassertions / -enableassertions
2635 // These accept an optional class/package name separated by a colon, e.g.,
2636 // -da:java.lang.Thread.
2637 } else if (match_option(option, user_assertion_options, &tail, true)) {
2638 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2639 if (*tail == '\0') {
2640 JavaAssertions::setUserClassDefault(enable);
2641 } else {
2642 assert(*tail == ':', "bogus match by match_option()");
2643 JavaAssertions::addOption(tail + 1, enable);
2644 }
2645 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2646 } else if (match_option(option, system_assertion_options, &tail, false)) {
2647 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2648 JavaAssertions::setSystemClassDefault(enable);
2649 // -bootclasspath:
2650 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2651 jio_fprintf(defaultStream::output_stream(),
2652 "-Xbootclasspath is no longer a supported option.\n");
2653 return JNI_EINVAL;
2654 // -bootclasspath/a:
2655 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2656 Arguments::append_sysclasspath(tail);
2657 // -bootclasspath/p:
2658 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2659 jio_fprintf(defaultStream::output_stream(),
2660 "-Xbootclasspath/p is no longer a supported option.\n");
2661 return JNI_EINVAL;
2662 // -Xrun
2663 } else if (match_option(option, "-Xrun", &tail)) {
2664 if (tail != NULL) {
2665 const char* pos = strchr(tail, ':');
2666 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2667 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2668 jio_snprintf(name, len + 1, "%s", tail);
2669
2670 char *options = NULL;
2671 if(pos != NULL) {
2672 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2673 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2674 }
2675 #if !INCLUDE_JVMTI
2676 if (strcmp(name, "jdwp") == 0) {
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Debugging agents are not supported in this VM\n");
2679 return JNI_ERR;
2680 }
2681 #endif // !INCLUDE_JVMTI
2682 add_init_library(name, options);
2683 }
2684 } else if (match_option(option, "--add-reads=", &tail)) {
2685 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2686 return JNI_ENOMEM;
2687 }
2688 } else if (match_option(option, "--add-exports=", &tail)) {
2689 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2690 return JNI_ENOMEM;
2691 }
2692 } else if (match_option(option, "--add-opens=", &tail)) {
2693 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2694 return JNI_ENOMEM;
2695 }
2696 } else if (match_option(option, "--add-modules=", &tail)) {
2697 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2698 return JNI_ENOMEM;
2699 }
2700 } else if (match_option(option, "--limit-modules=", &tail)) {
2701 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2702 return JNI_ENOMEM;
2703 }
2704 } else if (match_option(option, "--module-path=", &tail)) {
2705 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2706 return JNI_ENOMEM;
2707 }
2708 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2709 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2710 return JNI_ENOMEM;
2711 }
2712 } else if (match_option(option, "--patch-module=", &tail)) {
2713 // --patch-module=<module>=<file>(<pathsep><file>)*
2714 int res = process_patch_mod_option(tail, patch_mod_javabase);
2715 if (res != JNI_OK) {
2716 return res;
2717 }
2718 } else if (match_option(option, "--illegal-access=", &tail)) {
2719 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2720 return JNI_ENOMEM;
2721 }
2722 // -agentlib and -agentpath
2723 } else if (match_option(option, "-agentlib:", &tail) ||
2724 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2725 if(tail != NULL) {
2726 const char* pos = strchr(tail, '=');
2727 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2728 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2729 name[len] = '\0';
2730
2731 char *options = NULL;
2732 if(pos != NULL) {
2733 options = os::strdup_check_oom(pos + 1, mtArguments);
2734 }
2735 #if !INCLUDE_JVMTI
2736 if (valid_jdwp_agent(name, is_absolute_path)) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Debugging agents are not supported in this VM\n");
2739 return JNI_ERR;
2740 }
2741 #endif // !INCLUDE_JVMTI
2742 add_init_agent(name, options, is_absolute_path);
2743 }
2744 // -javaagent
2745 } else if (match_option(option, "-javaagent:", &tail)) {
2746 #if !INCLUDE_JVMTI
2747 jio_fprintf(defaultStream::error_stream(),
2748 "Instrumentation agents are not supported in this VM\n");
2749 return JNI_ERR;
2750 #else
2751 if (tail != NULL) {
2752 size_t length = strlen(tail) + 1;
2753 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2754 jio_snprintf(options, length, "%s", tail);
2755 add_instrument_agent("instrument", options, false);
2756 // java agents need module java.instrument
2757 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2758 return JNI_ENOMEM;
2759 }
2760 }
2761 #endif // !INCLUDE_JVMTI
2762 // --enable_preview
2763 } else if (match_option(option, "--enable-preview")) {
2764 set_enable_preview();
2765 // -Xnoclassgc
2766 } else if (match_option(option, "-Xnoclassgc")) {
2767 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 // -Xconcgc
2771 } else if (match_option(option, "-Xconcgc")) {
2772 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2776 // -Xnoconcgc
2777 } else if (match_option(option, "-Xnoconcgc")) {
2778 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2782 // -Xbatch
2783 } else if (match_option(option, "-Xbatch")) {
2784 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2785 return JNI_EINVAL;
2786 }
2787 // -Xmn for compatibility with other JVM vendors
2788 } else if (match_option(option, "-Xmn", &tail)) {
2789 julong long_initial_young_size = 0;
2790 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2791 if (errcode != arg_in_range) {
2792 jio_fprintf(defaultStream::error_stream(),
2793 "Invalid initial young generation size: %s\n", option->optionString);
2794 describe_range_error(errcode);
2795 return JNI_EINVAL;
2796 }
2797 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 // -Xms
2804 } else if (match_option(option, "-Xms", &tail)) {
2805 julong long_initial_heap_size = 0;
2806 // an initial heap size of 0 means automatically determine
2807 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2808 if (errcode != arg_in_range) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Invalid initial heap size: %s\n", option->optionString);
2811 describe_range_error(errcode);
2812 return JNI_EINVAL;
2813 }
2814 set_min_heap_size((size_t)long_initial_heap_size);
2815 // Currently the minimum size and the initial heap sizes are the same.
2816 // Can be overridden with -XX:InitialHeapSize.
2817 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2818 return JNI_EINVAL;
2819 }
2820 // -Xmx
2821 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2822 julong long_max_heap_size = 0;
2823 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2824 if (errcode != arg_in_range) {
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Invalid maximum heap size: %s\n", option->optionString);
2827 describe_range_error(errcode);
2828 return JNI_EINVAL;
2829 }
2830 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 // Xmaxf
2834 } else if (match_option(option, "-Xmaxf", &tail)) {
2835 char* err;
2836 int maxf = (int)(strtod(tail, &err) * 100);
2837 if (*err != '\0' || *tail == '\0') {
2838 jio_fprintf(defaultStream::error_stream(),
2839 "Bad max heap free percentage size: %s\n",
2840 option->optionString);
2841 return JNI_EINVAL;
2842 } else {
2843 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2844 return JNI_EINVAL;
2845 }
2846 }
2847 // Xminf
2848 } else if (match_option(option, "-Xminf", &tail)) {
2849 char* err;
2850 int minf = (int)(strtod(tail, &err) * 100);
2851 if (*err != '\0' || *tail == '\0') {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Bad min heap free percentage size: %s\n",
2854 option->optionString);
2855 return JNI_EINVAL;
2856 } else {
2857 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2858 return JNI_EINVAL;
2859 }
2860 }
2861 // -Xss
2862 } else if (match_option(option, "-Xss", &tail)) {
2863 intx value = 0;
2864 jint err = parse_xss(option, tail, &value);
2865 if (err != JNI_OK) {
2866 return err;
2867 }
2868 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2869 return JNI_EINVAL;
2870 }
2871 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2872 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2873 julong long_ReservedCodeCacheSize = 0;
2874
2875 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2876 if (errcode != arg_in_range) {
2877 jio_fprintf(defaultStream::error_stream(),
2878 "Invalid maximum code cache size: %s.\n", option->optionString);
2879 return JNI_EINVAL;
2880 }
2881 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 // -green
2885 } else if (match_option(option, "-green")) {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Green threads support not available\n");
2888 return JNI_EINVAL;
2889 // -native
2890 } else if (match_option(option, "-native")) {
2891 // HotSpot always uses native threads, ignore silently for compatibility
2892 // -Xrs
2893 } else if (match_option(option, "-Xrs")) {
2894 // Classic/EVM option, new functionality
2895 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898 // -Xprof
2899 } else if (match_option(option, "-Xprof")) {
2900 char version[256];
2901 // Obsolete in JDK 10
2902 JDK_Version::jdk(10).to_string(version, sizeof(version));
2903 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2904 // -Xconcurrentio
2905 } else if (match_option(option, "-Xconcurrentio")) {
2906 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != JVMFlag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2910 return JNI_EINVAL;
2911 }
2912 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2913 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != JVMFlag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != JVMFlag::SUCCESS) { // 20Kb per thread added to new generation
2917 return JNI_EINVAL;
2918 }
2919
2920 // -Xinternalversion
2921 } else if (match_option(option, "-Xinternalversion")) {
2922 jio_fprintf(defaultStream::output_stream(), "%s\n",
2923 VM_Version::internal_vm_info_string());
2924 vm_exit(0);
2925 #ifndef PRODUCT
2926 // -Xprintflags
2927 } else if (match_option(option, "-Xprintflags")) {
2928 JVMFlag::printFlags(tty, false);
2929 vm_exit(0);
2930 #endif
2931 // -D
2932 } else if (match_option(option, "-D", &tail)) {
2933 const char* value;
2934 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2935 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2936 // abort if -Djava.endorsed.dirs is set
2937 jio_fprintf(defaultStream::output_stream(),
2938 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2939 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2940 return JNI_EINVAL;
2941 }
2942 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2943 *value != '\0' && strcmp(value, "\"\"") != 0) {
2944 // abort if -Djava.ext.dirs is set
2945 jio_fprintf(defaultStream::output_stream(),
2946 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2947 return JNI_EINVAL;
2948 }
2949 // Check for module related properties. They must be set using the modules
2950 // options. For example: use "--add-modules=java.sql", not
2951 // "-Djdk.module.addmods=java.sql"
2952 if (is_internal_module_property(option->optionString + 2)) {
2953 needs_module_property_warning = true;
2954 continue;
2955 }
2956
2957 if (!add_property(tail)) {
2958 return JNI_ENOMEM;
2959 }
2960 // Out of the box management support
2961 if (match_option(option, "-Dcom.sun.management", &tail)) {
2962 #if INCLUDE_MANAGEMENT
2963 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 // management agent in module jdk.management.agent
2967 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2968 return JNI_ENOMEM;
2969 }
2970 #else
2971 jio_fprintf(defaultStream::output_stream(),
2972 "-Dcom.sun.management is not supported in this VM.\n");
2973 return JNI_ERR;
2974 #endif
2975 }
2976 // -Xint
2977 } else if (match_option(option, "-Xint")) {
2978 set_mode_flags(_int);
2979 // -Xmixed
2980 } else if (match_option(option, "-Xmixed")) {
2981 set_mode_flags(_mixed);
2982 // -Xcomp
2983 } else if (match_option(option, "-Xcomp")) {
2984 // for testing the compiler; turn off all flags that inhibit compilation
2985 set_mode_flags(_comp);
2986 // -Xshare:dump
2987 } else if (match_option(option, "-Xshare:dump")) {
2988 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2989 return JNI_EINVAL;
2990 }
2991 set_mode_flags(_int); // Prevent compilation, which creates objects
2992 // -Xshare:on
2993 } else if (match_option(option, "-Xshare:on")) {
2994 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2995 return JNI_EINVAL;
2996 }
2997 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2998 return JNI_EINVAL;
2999 }
3000 // -Xshare:auto
3001 } else if (match_option(option, "-Xshare:auto")) {
3002 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3003 return JNI_EINVAL;
3004 }
3005 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 // -Xshare:off
3009 } else if (match_option(option, "-Xshare:off")) {
3010 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
3011 return JNI_EINVAL;
3012 }
3013 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
3014 return JNI_EINVAL;
3015 }
3016 // -Xverify
3017 } else if (match_option(option, "-Xverify", &tail)) {
3018 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3019 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
3020 return JNI_EINVAL;
3021 }
3022 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
3023 return JNI_EINVAL;
3024 }
3025 } else if (strcmp(tail, ":remote") == 0) {
3026 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
3027 return JNI_EINVAL;
3028 }
3029 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
3030 return JNI_EINVAL;
3031 }
3032 } else if (strcmp(tail, ":none") == 0) {
3033 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
3034 return JNI_EINVAL;
3035 }
3036 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3040 return JNI_EINVAL;
3041 }
3042 // -Xdebug
3043 } else if (match_option(option, "-Xdebug")) {
3044 // note this flag has been used, then ignore
3045 set_xdebug_mode(true);
3046 // -Xnoagent
3047 } else if (match_option(option, "-Xnoagent")) {
3048 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3049 } else if (match_option(option, "-Xloggc:", &tail)) {
3050 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3051 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3052 _gc_log_filename = os::strdup_check_oom(tail);
3053 } else if (match_option(option, "-Xlog", &tail)) {
3054 bool ret = false;
3055 if (strcmp(tail, ":help") == 0) {
3056 fileStream stream(defaultStream::output_stream());
3057 LogConfiguration::print_command_line_help(&stream);
3058 vm_exit(0);
3059 } else if (strcmp(tail, ":disable") == 0) {
3060 LogConfiguration::disable_logging();
3061 ret = true;
3062 } else if (*tail == '\0') {
3063 ret = LogConfiguration::parse_command_line_arguments();
3064 assert(ret, "-Xlog without arguments should never fail to parse");
3065 } else if (*tail == ':') {
3066 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3067 }
3068 if (ret == false) {
3069 jio_fprintf(defaultStream::error_stream(),
3070 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
3071 tail);
3072 return JNI_EINVAL;
3073 }
3074 // JNI hooks
3075 } else if (match_option(option, "-Xcheck", &tail)) {
3076 if (!strcmp(tail, ":jni")) {
3077 #if !INCLUDE_JNI_CHECK
3078 warning("JNI CHECKING is not supported in this VM");
3079 #else
3080 CheckJNICalls = true;
3081 #endif // INCLUDE_JNI_CHECK
3082 } else if (is_bad_option(option, args->ignoreUnrecognized,
3083 "check")) {
3084 return JNI_EINVAL;
3085 }
3086 } else if (match_option(option, "vfprintf")) {
3087 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3088 } else if (match_option(option, "exit")) {
3089 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3090 } else if (match_option(option, "abort")) {
3091 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3092 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3093 // and the last option wins.
3094 } else if (match_option(option, "-XX:+NeverTenure")) {
3095 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
3096 return JNI_EINVAL;
3097 }
3098 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
3099 return JNI_EINVAL;
3100 }
3101 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
3102 return JNI_EINVAL;
3103 }
3104 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3105 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
3106 return JNI_EINVAL;
3107 }
3108 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
3109 return JNI_EINVAL;
3110 }
3111 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
3112 return JNI_EINVAL;
3113 }
3114 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3115 uintx max_tenuring_thresh = 0;
3116 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3117 jio_fprintf(defaultStream::error_stream(),
3118 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3119 return JNI_EINVAL;
3120 }
3121
3122 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
3123 return JNI_EINVAL;
3124 }
3125
3126 if (MaxTenuringThreshold == 0) {
3127 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
3128 return JNI_EINVAL;
3129 }
3130 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 } else {
3134 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
3135 return JNI_EINVAL;
3136 }
3137 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
3138 return JNI_EINVAL;
3139 }
3140 }
3141 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3142 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
3146 return JNI_EINVAL;
3147 }
3148 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3149 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3156 #if defined(DTRACE_ENABLED)
3157 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
3158 return JNI_EINVAL;
3159 }
3160 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
3161 return JNI_EINVAL;
3162 }
3163 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
3164 return JNI_EINVAL;
3165 }
3166 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
3167 return JNI_EINVAL;
3168 }
3169 #else // defined(DTRACE_ENABLED)
3170 jio_fprintf(defaultStream::error_stream(),
3171 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3172 return JNI_EINVAL;
3173 #endif // defined(DTRACE_ENABLED)
3174 #ifdef ASSERT
3175 } else if (match_option(option, "-XX:+FullGCALot")) {
3176 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 // disable scavenge before parallel mark-compact
3180 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 #endif
3184 #if !INCLUDE_MANAGEMENT
3185 } else if (match_option(option, "-XX:+ManagementServer")) {
3186 jio_fprintf(defaultStream::error_stream(),
3187 "ManagementServer is not supported in this VM.\n");
3188 return JNI_ERR;
3189 #endif // INCLUDE_MANAGEMENT
3190 #if INCLUDE_JFR
3191 } else if (match_jfr_option(&option)) {
3192 return JNI_EINVAL;
3193 #endif
3194 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3195 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3196 // already been handled
3197 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3198 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3199 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3200 return JNI_EINVAL;
3201 }
3202 }
3203 // Unknown option
3204 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3205 return JNI_ERR;
3206 }
3207 }
3208
3209 // PrintSharedArchiveAndExit will turn on
3210 // -Xshare:on
3211 // -Xlog:class+path=info
3212 if (PrintSharedArchiveAndExit) {
3213 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3214 return JNI_EINVAL;
3215 }
3216 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3217 return JNI_EINVAL;
3218 }
3219 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3220 }
3221
3222 // Change the default value for flags which have different default values
3223 // when working with older JDKs.
3224 #ifdef LINUX
3225 if (JDK_Version::current().compare_major(6) <= 0 &&
3226 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3227 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3228 }
3229 #endif // LINUX
3230 fix_appclasspath();
3231 return JNI_OK;
3232 }
3233
3234 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3235 // For java.base check for duplicate --patch-module options being specified on the command line.
3236 // This check is only required for java.base, all other duplicate module specifications
3237 // will be checked during module system initialization. The module system initialization
3238 // will throw an ExceptionInInitializerError if this situation occurs.
3239 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3240 if (*patch_mod_javabase) {
3241 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3242 } else {
3243 *patch_mod_javabase = true;
3244 }
3245 }
3246
3247 // Create GrowableArray lazily, only if --patch-module has been specified
3248 if (_patch_mod_prefix == NULL) {
3249 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3250 }
3251
3252 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3253 }
3254
3255 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3256 //
3257 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3258 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3259 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3260 // path is treated as the current directory.
3261 //
3262 // This causes problems with CDS, which requires that all directories specified in the classpath
3263 // must be empty. In most cases, applications do NOT want to load classes from the current
3264 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3265 // scripts compatible with CDS.
3266 void Arguments::fix_appclasspath() {
3267 if (IgnoreEmptyClassPaths) {
3268 const char separator = *os::path_separator();
3269 const char* src = _java_class_path->value();
3270
3271 // skip over all the leading empty paths
3272 while (*src == separator) {
3273 src ++;
3274 }
3275
3276 char* copy = os::strdup_check_oom(src, mtArguments);
3277
3278 // trim all trailing empty paths
3279 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3280 *tail = '\0';
3281 }
3282
3283 char from[3] = {separator, separator, '\0'};
3284 char to [2] = {separator, '\0'};
3285 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3286 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3287 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3288 }
3289
3290 _java_class_path->set_writeable_value(copy);
3291 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3292 }
3293 }
3294
3295 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3296 // check if the default lib/endorsed directory exists; if so, error
3297 char path[JVM_MAXPATHLEN];
3298 const char* fileSep = os::file_separator();
3299 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3300
3301 DIR* dir = os::opendir(path);
3302 if (dir != NULL) {
3303 jio_fprintf(defaultStream::output_stream(),
3304 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3305 "in modular form will be supported via the concept of upgradeable modules.\n");
3306 os::closedir(dir);
3307 return JNI_ERR;
3308 }
3309
3310 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3311 dir = os::opendir(path);
3312 if (dir != NULL) {
3313 jio_fprintf(defaultStream::output_stream(),
3314 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3315 "Use -classpath instead.\n.");
3316 os::closedir(dir);
3317 return JNI_ERR;
3318 }
3319
3320 // This must be done after all arguments have been processed
3321 // and the container support has been initialized since AggressiveHeap
3322 // relies on the amount of total memory available.
3323 if (AggressiveHeap) {
3324 jint result = set_aggressive_heap_flags();
3325 if (result != JNI_OK) {
3326 return result;
3327 }
3328 }
3329
3330 // This must be done after all arguments have been processed.
3331 // java_compiler() true means set to "NONE" or empty.
3332 if (java_compiler() && !xdebug_mode()) {
3333 // For backwards compatibility, we switch to interpreted mode if
3334 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3335 // not specified.
3336 set_mode_flags(_int);
3337 }
3338
3339 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3340 // but like -Xint, leave compilation thresholds unaffected.
3341 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3342 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3343 set_mode_flags(_int);
3344 }
3345
3346 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3347 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3348 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3349 }
3350
3351 #if !COMPILER2_OR_JVMCI
3352 // Don't degrade server performance for footprint
3353 if (FLAG_IS_DEFAULT(UseLargePages) &&
3354 MaxHeapSize < LargePageHeapSizeThreshold) {
3355 // No need for large granularity pages w/small heaps.
3356 // Note that large pages are enabled/disabled for both the
3357 // Java heap and the code cache.
3358 FLAG_SET_DEFAULT(UseLargePages, false);
3359 }
3360
3361 #elif defined(COMPILER2)
3362 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3363 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3364 }
3365 #endif
3366
3367 #if !COMPILER2_OR_JVMCI
3368 UNSUPPORTED_OPTION(ProfileInterpreter);
3369 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3370 #endif
3371
3372 #ifndef TIERED
3373 // Tiered compilation is undefined.
3374 UNSUPPORTED_OPTION(TieredCompilation);
3375 #endif
3376
3377 if (!check_vm_args_consistency()) {
3378 return JNI_ERR;
3379 }
3380
3381 #if INCLUDE_JVMCI
3382 if (EnableJVMCI &&
3383 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3384 return JNI_ENOMEM;
3385 }
3386 #endif
3387
3388 #if INCLUDE_JVMCI
3389 if (UseJVMCICompiler) {
3390 Compilation_mode = CompMode_server;
3391 }
3392 #endif
3393
3394 #if INCLUDE_CDS
3395 if (DumpSharedSpaces) {
3396 // Disable biased locking now as it interferes with the clean up of
3397 // the archived Klasses and Java string objects (at dump time only).
3398 UseBiasedLocking = false;
3399
3400 // Always verify non-system classes during CDS dump
3401 if (!BytecodeVerificationRemote) {
3402 BytecodeVerificationRemote = true;
3403 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3404 }
3405 }
3406 if (UseSharedSpaces && patch_mod_javabase) {
3407 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3408 }
3409 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3410 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3411 }
3412 #endif
3413
3414 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3415 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3416 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3417
3418 return JNI_OK;
3419 }
3420
3421 // Helper class for controlling the lifetime of JavaVMInitArgs
3422 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3423 // deleted on the destruction of the ScopedVMInitArgs object.
3424 class ScopedVMInitArgs : public StackObj {
3425 private:
3426 JavaVMInitArgs _args;
3427 char* _container_name;
3428 bool _is_set;
3429 char* _vm_options_file_arg;
3430
3431 public:
3432 ScopedVMInitArgs(const char *container_name) {
3433 _args.version = JNI_VERSION_1_2;
3434 _args.nOptions = 0;
3435 _args.options = NULL;
3436 _args.ignoreUnrecognized = false;
3437 _container_name = (char *)container_name;
3438 _is_set = false;
3439 _vm_options_file_arg = NULL;
3440 }
3441
3442 // Populates the JavaVMInitArgs object represented by this
3443 // ScopedVMInitArgs object with the arguments in options. The
3444 // allocated memory is deleted by the destructor. If this method
3445 // returns anything other than JNI_OK, then this object is in a
3446 // partially constructed state, and should be abandoned.
3447 jint set_args(GrowableArray<JavaVMOption>* options) {
3448 _is_set = true;
3449 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3450 JavaVMOption, options->length(), mtArguments);
3451 if (options_arr == NULL) {
3452 return JNI_ENOMEM;
3453 }
3454 _args.options = options_arr;
3455
3456 for (int i = 0; i < options->length(); i++) {
3457 options_arr[i] = options->at(i);
3458 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3459 if (options_arr[i].optionString == NULL) {
3460 // Rely on the destructor to do cleanup.
3461 _args.nOptions = i;
3462 return JNI_ENOMEM;
3463 }
3464 }
3465
3466 _args.nOptions = options->length();
3467 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3468 return JNI_OK;
3469 }
3470
3471 JavaVMInitArgs* get() { return &_args; }
3472 char* container_name() { return _container_name; }
3473 bool is_set() { return _is_set; }
3474 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3475 char* vm_options_file_arg() { return _vm_options_file_arg; }
3476
3477 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3478 if (_vm_options_file_arg != NULL) {
3479 os::free(_vm_options_file_arg);
3480 }
3481 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3482 }
3483
3484 ~ScopedVMInitArgs() {
3485 if (_vm_options_file_arg != NULL) {
3486 os::free(_vm_options_file_arg);
3487 }
3488 if (_args.options == NULL) return;
3489 for (int i = 0; i < _args.nOptions; i++) {
3490 os::free(_args.options[i].optionString);
3491 }
3492 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3493 }
3494
3495 // Insert options into this option list, to replace option at
3496 // vm_options_file_pos (-XX:VMOptionsFile)
3497 jint insert(const JavaVMInitArgs* args,
3498 const JavaVMInitArgs* args_to_insert,
3499 const int vm_options_file_pos) {
3500 assert(_args.options == NULL, "shouldn't be set yet");
3501 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3502 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3503
3504 int length = args->nOptions + args_to_insert->nOptions - 1;
3505 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3506 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3507 for (int i = 0; i < args->nOptions; i++) {
3508 if (i == vm_options_file_pos) {
3509 // insert the new options starting at the same place as the
3510 // -XX:VMOptionsFile option
3511 for (int j = 0; j < args_to_insert->nOptions; j++) {
3512 options->push(args_to_insert->options[j]);
3513 }
3514 } else {
3515 options->push(args->options[i]);
3516 }
3517 }
3518 // make into options array
3519 jint result = set_args(options);
3520 delete options;
3521 return result;
3522 }
3523 };
3524
3525 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3526 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3527 }
3528
3529 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3530 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3531 }
3532
3533 jint Arguments::parse_options_environment_variable(const char* name,
3534 ScopedVMInitArgs* vm_args) {
3535 char *buffer = ::getenv(name);
3536
3537 // Don't check this environment variable if user has special privileges
3538 // (e.g. unix su command).
3539 if (buffer == NULL || os::have_special_privileges()) {
3540 return JNI_OK;
3541 }
3542
3543 if ((buffer = os::strdup(buffer)) == NULL) {
3544 return JNI_ENOMEM;
3545 }
3546
3547 jio_fprintf(defaultStream::error_stream(),
3548 "Picked up %s: %s\n", name, buffer);
3549
3550 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3551
3552 os::free(buffer);
3553 return retcode;
3554 }
3555
3556 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3557 // read file into buffer
3558 int fd = ::open(file_name, O_RDONLY);
3559 if (fd < 0) {
3560 jio_fprintf(defaultStream::error_stream(),
3561 "Could not open options file '%s'\n",
3562 file_name);
3563 return JNI_ERR;
3564 }
3565
3566 struct stat stbuf;
3567 int retcode = os::stat(file_name, &stbuf);
3568 if (retcode != 0) {
3569 jio_fprintf(defaultStream::error_stream(),
3570 "Could not stat options file '%s'\n",
3571 file_name);
3572 os::close(fd);
3573 return JNI_ERR;
3574 }
3575
3576 if (stbuf.st_size == 0) {
3577 // tell caller there is no option data and that is ok
3578 os::close(fd);
3579 return JNI_OK;
3580 }
3581
3582 // '+ 1' for NULL termination even with max bytes
3583 size_t bytes_alloc = stbuf.st_size + 1;
3584
3585 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3586 if (NULL == buf) {
3587 jio_fprintf(defaultStream::error_stream(),
3588 "Could not allocate read buffer for options file parse\n");
3589 os::close(fd);
3590 return JNI_ENOMEM;
3591 }
3592
3593 memset(buf, 0, bytes_alloc);
3594
3595 // Fill buffer
3596 // Use ::read() instead of os::read because os::read()
3597 // might do a thread state transition
3598 // and it is too early for that here
3599
3600 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3601 os::close(fd);
3602 if (bytes_read < 0) {
3603 FREE_C_HEAP_ARRAY(char, buf);
3604 jio_fprintf(defaultStream::error_stream(),
3605 "Could not read options file '%s'\n", file_name);
3606 return JNI_ERR;
3607 }
3608
3609 if (bytes_read == 0) {
3610 // tell caller there is no option data and that is ok
3611 FREE_C_HEAP_ARRAY(char, buf);
3612 return JNI_OK;
3613 }
3614
3615 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3616
3617 FREE_C_HEAP_ARRAY(char, buf);
3618 return retcode;
3619 }
3620
3621 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3622 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3623
3624 // some pointers to help with parsing
3625 char *buffer_end = buffer + buf_len;
3626 char *opt_hd = buffer;
3627 char *wrt = buffer;
3628 char *rd = buffer;
3629
3630 // parse all options
3631 while (rd < buffer_end) {
3632 // skip leading white space from the input string
3633 while (rd < buffer_end && isspace(*rd)) {
3634 rd++;
3635 }
3636
3637 if (rd >= buffer_end) {
3638 break;
3639 }
3640
3641 // Remember this is where we found the head of the token.
3642 opt_hd = wrt;
3643
3644 // Tokens are strings of non white space characters separated
3645 // by one or more white spaces.
3646 while (rd < buffer_end && !isspace(*rd)) {
3647 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3648 int quote = *rd; // matching quote to look for
3649 rd++; // don't copy open quote
3650 while (rd < buffer_end && *rd != quote) {
3651 // include everything (even spaces)
3652 // up until the close quote
3653 *wrt++ = *rd++; // copy to option string
3654 }
3655
3656 if (rd < buffer_end) {
3657 rd++; // don't copy close quote
3658 } else {
3659 // did not see closing quote
3660 jio_fprintf(defaultStream::error_stream(),
3661 "Unmatched quote in %s\n", name);
3662 delete options;
3663 return JNI_ERR;
3664 }
3665 } else {
3666 *wrt++ = *rd++; // copy to option string
3667 }
3668 }
3669
3670 // steal a white space character and set it to NULL
3671 *wrt++ = '\0';
3672 // We now have a complete token
3673
3674 JavaVMOption option;
3675 option.optionString = opt_hd;
3676 option.extraInfo = NULL;
3677
3678 options->append(option); // Fill in option
3679
3680 rd++; // Advance to next character
3681 }
3682
3683 // Fill out JavaVMInitArgs structure.
3684 jint status = vm_args->set_args(options);
3685
3686 delete options;
3687 return status;
3688 }
3689
3690 void Arguments::set_shared_spaces_flags() {
3691 if (DumpSharedSpaces) {
3692 if (FailOverToOldVerifier) {
3693 // Don't fall back to the old verifier on verification failure. If a
3694 // class fails verification with the split verifier, it might fail the
3695 // CDS runtime verifier constraint check. In that case, we don't want
3696 // to share the class. We only archive classes that pass the split verifier.
3697 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3698 }
3699
3700 if (RequireSharedSpaces) {
3701 warning("Cannot dump shared archive while using shared archive");
3702 }
3703 UseSharedSpaces = false;
3704 #ifdef _LP64
3705 if (!UseCompressedOops || !UseCompressedClassPointers) {
3706 vm_exit_during_initialization(
3707 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3708 }
3709 } else {
3710 if (!UseCompressedOops || !UseCompressedClassPointers) {
3711 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3712 }
3713 #endif
3714 }
3715 }
3716
3717 // Sharing support
3718 // Construct the path to the archive
3719 static char* get_shared_archive_path() {
3720 char *shared_archive_path;
3721 if (SharedArchiveFile == NULL) {
3722 char jvm_path[JVM_MAXPATHLEN];
3723 os::jvm_path(jvm_path, sizeof(jvm_path));
3724 char *end = strrchr(jvm_path, *os::file_separator());
3725 if (end != NULL) *end = '\0';
3726 size_t jvm_path_len = strlen(jvm_path);
3727 size_t file_sep_len = strlen(os::file_separator());
3728 const size_t len = jvm_path_len + file_sep_len + 20;
3729 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3730 if (shared_archive_path != NULL) {
3731 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3732 jvm_path, os::file_separator());
3733 }
3734 } else {
3735 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3736 }
3737 return shared_archive_path;
3738 }
3739
3740 #ifndef PRODUCT
3741 // Determine whether LogVMOutput should be implicitly turned on.
3742 static bool use_vm_log() {
3743 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3744 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3745 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3746 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3747 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3748 return true;
3749 }
3750
3751 #ifdef COMPILER1
3752 if (PrintC1Statistics) {
3753 return true;
3754 }
3755 #endif // COMPILER1
3756
3757 #ifdef COMPILER2
3758 if (PrintOptoAssembly || PrintOptoStatistics) {
3759 return true;
3760 }
3761 #endif // COMPILER2
3762
3763 return false;
3764 }
3765
3766 #endif // PRODUCT
3767
3768 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3769 for (int index = 0; index < args->nOptions; index++) {
3770 const JavaVMOption* option = args->options + index;
3771 const char* tail;
3772 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3773 return true;
3774 }
3775 }
3776 return false;
3777 }
3778
3779 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3780 const char* vm_options_file,
3781 const int vm_options_file_pos,
3782 ScopedVMInitArgs* vm_options_file_args,
3783 ScopedVMInitArgs* args_out) {
3784 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3785 if (code != JNI_OK) {
3786 return code;
3787 }
3788
3789 if (vm_options_file_args->get()->nOptions < 1) {
3790 return JNI_OK;
3791 }
3792
3793 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3794 jio_fprintf(defaultStream::error_stream(),
3795 "A VM options file may not refer to a VM options file. "
3796 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3797 "options file '%s' in options container '%s' is an error.\n",
3798 vm_options_file_args->vm_options_file_arg(),
3799 vm_options_file_args->container_name());
3800 return JNI_EINVAL;
3801 }
3802
3803 return args_out->insert(args, vm_options_file_args->get(),
3804 vm_options_file_pos);
3805 }
3806
3807 // Expand -XX:VMOptionsFile found in args_in as needed.
3808 // mod_args and args_out parameters may return values as needed.
3809 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3810 ScopedVMInitArgs* mod_args,
3811 JavaVMInitArgs** args_out) {
3812 jint code = match_special_option_and_act(args_in, mod_args);
3813 if (code != JNI_OK) {
3814 return code;
3815 }
3816
3817 if (mod_args->is_set()) {
3818 // args_in contains -XX:VMOptionsFile and mod_args contains the
3819 // original options from args_in along with the options expanded
3820 // from the VMOptionsFile. Return a short-hand to the caller.
3821 *args_out = mod_args->get();
3822 } else {
3823 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3824 }
3825 return JNI_OK;
3826 }
3827
3828 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3829 ScopedVMInitArgs* args_out) {
3830 // Remaining part of option string
3831 const char* tail;
3832 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3833
3834 for (int index = 0; index < args->nOptions; index++) {
3835 const JavaVMOption* option = args->options + index;
3836 if (ArgumentsExt::process_options(option)) {
3837 continue;
3838 }
3839 if (match_option(option, "-XX:Flags=", &tail)) {
3840 Arguments::set_jvm_flags_file(tail);
3841 continue;
3842 }
3843 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3844 if (vm_options_file_args.found_vm_options_file_arg()) {
3845 jio_fprintf(defaultStream::error_stream(),
3846 "The option '%s' is already specified in the options "
3847 "container '%s' so the specification of '%s' in the "
3848 "same options container is an error.\n",
3849 vm_options_file_args.vm_options_file_arg(),
3850 vm_options_file_args.container_name(),
3851 option->optionString);
3852 return JNI_EINVAL;
3853 }
3854 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3855 // If there's a VMOptionsFile, parse that
3856 jint code = insert_vm_options_file(args, tail, index,
3857 &vm_options_file_args, args_out);
3858 if (code != JNI_OK) {
3859 return code;
3860 }
3861 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3862 if (args_out->is_set()) {
3863 // The VMOptions file inserted some options so switch 'args'
3864 // to the new set of options, and continue processing which
3865 // preserves "last option wins" semantics.
3866 args = args_out->get();
3867 // The first option from the VMOptionsFile replaces the
3868 // current option. So we back track to process the
3869 // replacement option.
3870 index--;
3871 }
3872 continue;
3873 }
3874 if (match_option(option, "-XX:+PrintVMOptions")) {
3875 PrintVMOptions = true;
3876 continue;
3877 }
3878 if (match_option(option, "-XX:-PrintVMOptions")) {
3879 PrintVMOptions = false;
3880 continue;
3881 }
3882 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3883 IgnoreUnrecognizedVMOptions = true;
3884 continue;
3885 }
3886 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3887 IgnoreUnrecognizedVMOptions = false;
3888 continue;
3889 }
3890 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3891 JVMFlag::printFlags(tty, false);
3892 vm_exit(0);
3893 }
3894 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3895 #if INCLUDE_NMT
3896 // The launcher did not setup nmt environment variable properly.
3897 if (!MemTracker::check_launcher_nmt_support(tail)) {
3898 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3899 }
3900
3901 // Verify if nmt option is valid.
3902 if (MemTracker::verify_nmt_option()) {
3903 // Late initialization, still in single-threaded mode.
3904 if (MemTracker::tracking_level() >= NMT_summary) {
3905 MemTracker::init();
3906 }
3907 } else {
3908 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3909 }
3910 continue;
3911 #else
3912 jio_fprintf(defaultStream::error_stream(),
3913 "Native Memory Tracking is not supported in this VM\n");
3914 return JNI_ERR;
3915 #endif
3916 }
3917
3918 #ifndef PRODUCT
3919 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3920 JVMFlag::printFlags(tty, true);
3921 vm_exit(0);
3922 }
3923 #endif
3924 }
3925 return JNI_OK;
3926 }
3927
3928 static void print_options(const JavaVMInitArgs *args) {
3929 const char* tail;
3930 for (int index = 0; index < args->nOptions; index++) {
3931 const JavaVMOption *option = args->options + index;
3932 if (match_option(option, "-XX:", &tail)) {
3933 logOption(tail);
3934 }
3935 }
3936 }
3937
3938 bool Arguments::handle_deprecated_print_gc_flags() {
3939 if (PrintGC) {
3940 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3941 }
3942 if (PrintGCDetails) {
3943 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3944 }
3945
3946 if (_gc_log_filename != NULL) {
3947 // -Xloggc was used to specify a filename
3948 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3949
3950 LogTarget(Error, logging) target;
3951 LogStream errstream(target);
3952 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3953 } else if (PrintGC || PrintGCDetails) {
3954 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3955 }
3956 return true;
3957 }
3958
3959 void Arguments::handle_extra_cms_flags(const char* msg) {
3960 SpecialFlag flag;
3961 const char *flag_name = "UseConcMarkSweepGC";
3962 if (lookup_special_flag(flag_name, flag)) {
3963 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3964 warning("%s", msg);
3965 }
3966 }
3967
3968 // Parse entry point called from JNI_CreateJavaVM
3969
3970 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3971 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3972
3973 // Initialize ranges, constraints and writeables
3974 JVMFlagRangeList::init();
3975 JVMFlagConstraintList::init();
3976 JVMFlagWriteableList::init();
3977
3978 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3979 const char* hotspotrc = ".hotspotrc";
3980 bool settings_file_specified = false;
3981 bool needs_hotspotrc_warning = false;
3982 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3983 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3984
3985 // Pointers to current working set of containers
3986 JavaVMInitArgs* cur_cmd_args;
3987 JavaVMInitArgs* cur_java_options_args;
3988 JavaVMInitArgs* cur_java_tool_options_args;
3989
3990 // Containers for modified/expanded options
3991 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3992 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3993 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3994
3995
3996 jint code =
3997 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3998 if (code != JNI_OK) {
3999 return code;
4000 }
4001
4002 code = parse_java_options_environment_variable(&initial_java_options_args);
4003 if (code != JNI_OK) {
4004 return code;
4005 }
4006
4007 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4008 &mod_java_tool_options_args,
4009 &cur_java_tool_options_args);
4010 if (code != JNI_OK) {
4011 return code;
4012 }
4013
4014 code = expand_vm_options_as_needed(initial_cmd_args,
4015 &mod_cmd_args,
4016 &cur_cmd_args);
4017 if (code != JNI_OK) {
4018 return code;
4019 }
4020
4021 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4022 &mod_java_options_args,
4023 &cur_java_options_args);
4024 if (code != JNI_OK) {
4025 return code;
4026 }
4027
4028 const char* flags_file = Arguments::get_jvm_flags_file();
4029 settings_file_specified = (flags_file != NULL);
4030
4031 if (IgnoreUnrecognizedVMOptions) {
4032 cur_cmd_args->ignoreUnrecognized = true;
4033 cur_java_tool_options_args->ignoreUnrecognized = true;
4034 cur_java_options_args->ignoreUnrecognized = true;
4035 }
4036
4037 // Parse specified settings file
4038 if (settings_file_specified) {
4039 if (!process_settings_file(flags_file, true,
4040 cur_cmd_args->ignoreUnrecognized)) {
4041 return JNI_EINVAL;
4042 }
4043 } else {
4044 #ifdef ASSERT
4045 // Parse default .hotspotrc settings file
4046 if (!process_settings_file(".hotspotrc", false,
4047 cur_cmd_args->ignoreUnrecognized)) {
4048 return JNI_EINVAL;
4049 }
4050 #else
4051 struct stat buf;
4052 if (os::stat(hotspotrc, &buf) == 0) {
4053 needs_hotspotrc_warning = true;
4054 }
4055 #endif
4056 }
4057
4058 if (PrintVMOptions) {
4059 print_options(cur_java_tool_options_args);
4060 print_options(cur_cmd_args);
4061 print_options(cur_java_options_args);
4062 }
4063
4064 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4065 jint result = parse_vm_init_args(cur_java_tool_options_args,
4066 cur_java_options_args,
4067 cur_cmd_args);
4068
4069 if (result != JNI_OK) {
4070 return result;
4071 }
4072
4073 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4074 SharedArchivePath = get_shared_archive_path();
4075 if (SharedArchivePath == NULL) {
4076 return JNI_ENOMEM;
4077 }
4078
4079 // Set up VerifySharedSpaces
4080 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4081 VerifySharedSpaces = true;
4082 }
4083
4084 // Delay warning until here so that we've had a chance to process
4085 // the -XX:-PrintWarnings flag
4086 if (needs_hotspotrc_warning) {
4087 warning("%s file is present but has been ignored. "
4088 "Run with -XX:Flags=%s to load the file.",
4089 hotspotrc, hotspotrc);
4090 }
4091
4092 if (needs_module_property_warning) {
4093 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4094 " names that are reserved for internal use.");
4095 }
4096
4097 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4098 UNSUPPORTED_OPTION(UseLargePages);
4099 #endif
4100
4101 ArgumentsExt::report_unsupported_options();
4102
4103 #ifndef PRODUCT
4104 if (TraceBytecodesAt != 0) {
4105 TraceBytecodes = true;
4106 }
4107 if (CountCompiledCalls) {
4108 if (UseCounterDecay) {
4109 warning("UseCounterDecay disabled because CountCalls is set");
4110 UseCounterDecay = false;
4111 }
4112 }
4113 #endif // PRODUCT
4114
4115 if (ScavengeRootsInCode == 0) {
4116 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4117 warning("Forcing ScavengeRootsInCode non-zero");
4118 }
4119 ScavengeRootsInCode = 1;
4120 }
4121
4122 if (!handle_deprecated_print_gc_flags()) {
4123 return JNI_EINVAL;
4124 }
4125
4126 // Set object alignment values.
4127 set_object_alignment();
4128
4129 #if !INCLUDE_CDS
4130 if (DumpSharedSpaces || RequireSharedSpaces) {
4131 jio_fprintf(defaultStream::error_stream(),
4132 "Shared spaces are not supported in this VM\n");
4133 return JNI_ERR;
4134 }
4135 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4136 log_is_enabled(Info, cds)) {
4137 warning("Shared spaces are not supported in this VM");
4138 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4139 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4140 }
4141 no_shared_spaces("CDS Disabled");
4142 #endif // INCLUDE_CDS
4143
4144 return JNI_OK;
4145 }
4146
4147 jint Arguments::apply_ergo() {
4148 // Set flags based on ergonomics.
4149 jint result = set_ergonomics_flags();
4150 if (result != JNI_OK) return result;
4151
4152 #if INCLUDE_JVMCI
4153 set_jvmci_specific_flags();
4154 #endif
4155
4156 set_shared_spaces_flags();
4157
4158 if (TieredCompilation) {
4159 set_tiered_flags();
4160 } else {
4161 int max_compilation_policy_choice = 1;
4162 #ifdef COMPILER2
4163 if (is_server_compilation_mode_vm()) {
4164 max_compilation_policy_choice = 2;
4165 }
4166 #endif
4167 // Check if the policy is valid.
4168 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4169 vm_exit_during_initialization(
4170 "Incompatible compilation policy selected", NULL);
4171 }
4172 // Scale CompileThreshold
4173 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4174 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4175 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4176 }
4177 }
4178
4179 #ifdef COMPILER2
4180 #ifndef PRODUCT
4181 if (PrintIdealGraphLevel > 0) {
4182 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4183 }
4184 #endif
4185 #endif
4186
4187 // Set heap size based on available physical memory
4188 set_heap_size();
4189
4190 GCConfig::arguments()->initialize();
4191
4192 // Initialize Metaspace flags and alignments
4193 Metaspace::ergo_initialize();
4194
4195 // Set bytecode rewriting flags
4196 set_bytecode_flags();
4197
4198 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4199 jint code = set_aggressive_opts_flags();
4200 if (code != JNI_OK) {
4201 return code;
4202 }
4203
4204 // Turn off biased locking for locking debug mode flags,
4205 // which are subtly different from each other but neither works with
4206 // biased locking
4207 if (UseHeavyMonitors
4208 #ifdef COMPILER1
4209 || !UseFastLocking
4210 #endif // COMPILER1
4211 #if INCLUDE_JVMCI
4212 || !JVMCIUseFastLocking
4213 #endif
4214 ) {
4215 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4216 // flag set to true on command line; warn the user that they
4217 // can't enable biased locking here
4218 warning("Biased Locking is not supported with locking debug flags"
4219 "; ignoring UseBiasedLocking flag." );
4220 }
4221 UseBiasedLocking = false;
4222 }
4223
4224 #ifdef CC_INTERP
4225 // Clear flags not supported on zero.
4226 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4227 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4228 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4229 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4230 #endif // CC_INTERP
4231
4232 #ifdef COMPILER2
4233 if (!EliminateLocks) {
4234 EliminateNestedLocks = false;
4235 }
4236 if (!Inline) {
4237 IncrementalInline = false;
4238 }
4239 #ifndef PRODUCT
4240 if (!IncrementalInline) {
4241 AlwaysIncrementalInline = false;
4242 }
4243 #endif
4244 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4245 // nothing to use the profiling, turn if off
4246 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4247 }
4248 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
4249 // blind guess
4250 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
4251 }
4252 #endif
4253
4254 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4255 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4256 DebugNonSafepoints = true;
4257 }
4258
4259 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4260 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4261 }
4262
4263 if (UseOnStackReplacement && !UseLoopCounter) {
4264 warning("On-stack-replacement requires loop counters; enabling loop counters");
4265 FLAG_SET_DEFAULT(UseLoopCounter, true);
4266 }
4267
4268 #ifndef PRODUCT
4269 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4270 if (use_vm_log()) {
4271 LogVMOutput = true;
4272 }
4273 }
4274 #endif // PRODUCT
4275
4276 if (PrintCommandLineFlags) {
4277 JVMFlag::printSetFlags(tty);
4278 }
4279
4280 // Apply CPU specific policy for the BiasedLocking
4281 if (UseBiasedLocking) {
4282 if (!VM_Version::use_biased_locking() &&
4283 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4284 UseBiasedLocking = false;
4285 }
4286 }
4287 #ifdef COMPILER2
4288 if (!UseBiasedLocking || EmitSync != 0) {
4289 UseOptoBiasInlining = false;
4290 }
4291 #endif
4292
4293 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4294 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4295 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4296 } else {
4297 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4298 }
4299
4300 return JNI_OK;
4301 }
4302
4303 jint Arguments::adjust_after_os() {
4304 if (UseNUMA) {
4305 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4306 FLAG_SET_ERGO(bool, UseNUMA, false);
4307 } else if (UseParallelGC || UseParallelOldGC) {
4308 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4309 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4310 }
4311 }
4312 // UseNUMAInterleaving is set to ON for all collectors and
4313 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4314 // such as the parallel collector for Linux and Solaris will
4315 // interleave old gen and survivor spaces on top of NUMA
4316 // allocation policy for the eden space.
4317 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4318 // all platforms and ParallelGC on Windows will interleave all
4319 // of the heap spaces across NUMA nodes.
4320 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4321 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4322 }
4323 }
4324 return JNI_OK;
4325 }
4326
4327 int Arguments::PropertyList_count(SystemProperty* pl) {
4328 int count = 0;
4329 while(pl != NULL) {
4330 count++;
4331 pl = pl->next();
4332 }
4333 return count;
4334 }
4335
4336 // Return the number of readable properties.
4337 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4338 int count = 0;
4339 while(pl != NULL) {
4340 if (pl->is_readable()) {
4341 count++;
4342 }
4343 pl = pl->next();
4344 }
4345 return count;
4346 }
4347
4348 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4349 assert(key != NULL, "just checking");
4350 SystemProperty* prop;
4351 for (prop = pl; prop != NULL; prop = prop->next()) {
4352 if (strcmp(key, prop->key()) == 0) return prop->value();
4353 }
4354 return NULL;
4355 }
4356
4357 // Return the value of the requested property provided that it is a readable property.
4358 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4359 assert(key != NULL, "just checking");
4360 SystemProperty* prop;
4361 // Return the property value if the keys match and the property is not internal or
4362 // it's the special internal property "jdk.boot.class.path.append".
4363 for (prop = pl; prop != NULL; prop = prop->next()) {
4364 if (strcmp(key, prop->key()) == 0) {
4365 if (!prop->internal()) {
4366 return prop->value();
4367 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4368 return prop->value();
4369 } else {
4370 // Property is internal and not jdk.boot.class.path.append so return NULL.
4371 return NULL;
4372 }
4373 }
4374 }
4375 return NULL;
4376 }
4377
4378 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4379 int count = 0;
4380 const char* ret_val = NULL;
4381
4382 while(pl != NULL) {
4383 if(count >= index) {
4384 ret_val = pl->key();
4385 break;
4386 }
4387 count++;
4388 pl = pl->next();
4389 }
4390
4391 return ret_val;
4392 }
4393
4394 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4395 int count = 0;
4396 char* ret_val = NULL;
4397
4398 while(pl != NULL) {
4399 if(count >= index) {
4400 ret_val = pl->value();
4401 break;
4402 }
4403 count++;
4404 pl = pl->next();
4405 }
4406
4407 return ret_val;
4408 }
4409
4410 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4411 SystemProperty* p = *plist;
4412 if (p == NULL) {
4413 *plist = new_p;
4414 } else {
4415 while (p->next() != NULL) {
4416 p = p->next();
4417 }
4418 p->set_next(new_p);
4419 }
4420 }
4421
4422 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4423 bool writeable, bool internal) {
4424 if (plist == NULL)
4425 return;
4426
4427 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4428 PropertyList_add(plist, new_p);
4429 }
4430
4431 void Arguments::PropertyList_add(SystemProperty *element) {
4432 PropertyList_add(&_system_properties, element);
4433 }
4434
4435 // This add maintains unique property key in the list.
4436 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4437 PropertyAppendable append, PropertyWriteable writeable,
4438 PropertyInternal internal) {
4439 if (plist == NULL)
4440 return;
4441
4442 // If property key exist then update with new value.
4443 SystemProperty* prop;
4444 for (prop = *plist; prop != NULL; prop = prop->next()) {
4445 if (strcmp(k, prop->key()) == 0) {
4446 if (append == AppendProperty) {
4447 prop->append_value(v);
4448 } else {
4449 prop->set_value(v);
4450 }
4451 return;
4452 }
4453 }
4454
4455 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4456 }
4457
4458 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4459 // Returns true if all of the source pointed by src has been copied over to
4460 // the destination buffer pointed by buf. Otherwise, returns false.
4461 // Notes:
4462 // 1. If the length (buflen) of the destination buffer excluding the
4463 // NULL terminator character is not long enough for holding the expanded
4464 // pid characters, it also returns false instead of returning the partially
4465 // expanded one.
4466 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4467 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4468 char* buf, size_t buflen) {
4469 const char* p = src;
4470 char* b = buf;
4471 const char* src_end = &src[srclen];
4472 char* buf_end = &buf[buflen - 1];
4473
4474 while (p < src_end && b < buf_end) {
4475 if (*p == '%') {
4476 switch (*(++p)) {
4477 case '%': // "%%" ==> "%"
4478 *b++ = *p++;
4479 break;
4480 case 'p': { // "%p" ==> current process id
4481 // buf_end points to the character before the last character so
4482 // that we could write '\0' to the end of the buffer.
4483 size_t buf_sz = buf_end - b + 1;
4484 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4485
4486 // if jio_snprintf fails or the buffer is not long enough to hold
4487 // the expanded pid, returns false.
4488 if (ret < 0 || ret >= (int)buf_sz) {
4489 return false;
4490 } else {
4491 b += ret;
4492 assert(*b == '\0', "fail in copy_expand_pid");
4493 if (p == src_end && b == buf_end + 1) {
4494 // reach the end of the buffer.
4495 return true;
4496 }
4497 }
4498 p++;
4499 break;
4500 }
4501 default :
4502 *b++ = '%';
4503 }
4504 } else {
4505 *b++ = *p++;
4506 }
4507 }
4508 *b = '\0';
4509 return (p == src_end); // return false if not all of the source was copied
4510 }