1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "logging/logStream.hpp"
37 #include "logging/logTag.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/flags/jvmFlagConstraintList.hpp"
45 #include "runtime/flags/jvmFlagWriteableList.hpp"
46 #include "runtime/flags/jvmFlagRangeList.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.inline.hpp"
50 #include "runtime/safepoint.hpp"
51 #include "runtime/safepointMechanism.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/align.hpp"
56 #include "utilities/defaultStream.hpp"
57 #include "utilities/macros.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JFR
60 #include "jfr/jfr.hpp"
61 #endif
62
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 char* Arguments::_jvm_flags_file = NULL;
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 size_t Arguments::_conservative_max_heap_alignment = 0;
74 Arguments::Mode Arguments::_mode = _mixed;
75 bool Arguments::_java_compiler = false;
76 bool Arguments::_xdebug_mode = false;
77 const char* Arguments::_java_vendor_url_bug = NULL;
78 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
79 bool Arguments::_sun_java_launcher_is_altjvm = false;
80
81 // These parameters are reset in method parse_vm_init_args()
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
87 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
88 size_t Arguments::_SharedBaseAddress = SharedBaseAddress;
89
90 bool Arguments::_enable_preview = false;
91
92 char* Arguments::SharedArchivePath = NULL;
93 char* Arguments::SharedDynamicArchivePath = NULL;
94
95 AgentLibraryList Arguments::_libraryList;
96 AgentLibraryList Arguments::_agentList;
97
98 // These are not set by the JDK's built-in launchers, but they can be set by
99 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
100 // JavaVMOption in jni.h.
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
111 SystemProperty *Arguments::_vm_info = NULL;
112
113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
114 PathString *Arguments::_system_boot_class_path = NULL;
115 bool Arguments::_has_jimage = false;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 bool PathString::set_value(const char *value) {
120 if (_value != NULL) {
121 FreeHeap(_value);
122 }
123 _value = AllocateHeap(strlen(value)+1, mtArguments);
124 assert(_value != NULL, "Unable to allocate space for new path value");
125 if (_value != NULL) {
126 strcpy(_value, value);
127 } else {
128 // not able to allocate
129 return false;
130 }
131 return true;
132 }
133
134 void PathString::append_value(const char *value) {
135 char *sp;
136 size_t len = 0;
137 if (value != NULL) {
138 len = strlen(value);
139 if (_value != NULL) {
140 len += strlen(_value);
141 }
142 sp = AllocateHeap(len+2, mtArguments);
143 assert(sp != NULL, "Unable to allocate space for new append path value");
144 if (sp != NULL) {
145 if (_value != NULL) {
146 strcpy(sp, _value);
147 strcat(sp, os::path_separator());
148 strcat(sp, value);
149 FreeHeap(_value);
150 } else {
151 strcpy(sp, value);
152 }
153 _value = sp;
154 }
155 }
156 }
157
158 PathString::PathString(const char* value) {
159 if (value == NULL) {
160 _value = NULL;
161 } else {
162 _value = AllocateHeap(strlen(value)+1, mtArguments);
163 strcpy(_value, value);
164 }
165 }
166
167 PathString::~PathString() {
168 if (_value != NULL) {
169 FreeHeap(_value);
170 _value = NULL;
171 }
172 }
173
174 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
175 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
176 size_t len = strlen(module_name) + 1;
177 _module_name = AllocateHeap(len, mtInternal);
178 strncpy(_module_name, module_name, len); // copy the trailing null
179 _path = new PathString(path);
180 }
181
182 ModulePatchPath::~ModulePatchPath() {
183 if (_module_name != NULL) {
184 FreeHeap(_module_name);
185 _module_name = NULL;
186 }
187 if (_path != NULL) {
188 delete _path;
189 _path = NULL;
190 }
191 }
192
193 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
194 if (key == NULL) {
195 _key = NULL;
196 } else {
197 _key = AllocateHeap(strlen(key)+1, mtArguments);
198 strcpy(_key, key);
199 }
200 _next = NULL;
201 _internal = internal;
202 _writeable = writeable;
203 }
204
205 AgentLibrary::AgentLibrary(const char* name, const char* options,
206 bool is_absolute_path, void* os_lib,
207 bool instrument_lib) {
208 _name = AllocateHeap(strlen(name)+1, mtArguments);
209 strcpy(_name, name);
210 if (options == NULL) {
211 _options = NULL;
212 } else {
213 _options = AllocateHeap(strlen(options)+1, mtArguments);
214 strcpy(_options, options);
215 }
216 _is_absolute_path = is_absolute_path;
217 _os_lib = os_lib;
218 _next = NULL;
219 _state = agent_invalid;
220 _is_static_lib = false;
221 _is_instrument_lib = instrument_lib;
222 }
223
224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
225 // part of the option string.
226 static bool match_option(const JavaVMOption *option, const char* name,
227 const char** tail) {
228 size_t len = strlen(name);
229 if (strncmp(option->optionString, name, len) == 0) {
230 *tail = option->optionString + len;
231 return true;
232 } else {
233 return false;
234 }
235 }
236
237 // Check if 'option' matches 'name'. No "tail" is allowed.
238 static bool match_option(const JavaVMOption *option, const char* name) {
239 const char* tail = NULL;
240 bool result = match_option(option, name, &tail);
241 if (tail != NULL && *tail == '\0') {
242 return result;
243 } else {
244 return false;
245 }
246 }
247
248 // Return true if any of the strings in null-terminated array 'names' matches.
249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
250 // the option must match exactly.
251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
252 bool tail_allowed) {
253 for (/* empty */; *names != NULL; ++names) {
254 if (match_option(option, *names, tail)) {
255 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
256 return true;
257 }
258 }
259 }
260 return false;
261 }
262
263 #if INCLUDE_JFR
264 static bool _has_jfr_option = false; // is using JFR
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != NULL, "invariant");
269 char* tail = NULL;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_start_flight_recording_option(option, tail);
273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_flight_recorder_option(option, tail);
276 }
277 return false;
278 }
279
280 bool Arguments::has_jfr_option() {
281 return _has_jfr_option;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
330 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
331 return ((strncmp(option, property, len) == 0) &&
332 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
333 }
334
335 // Return true if property starts with "jdk.module." and its ensuing chars match
336 // any of the reserved module properties.
337 // property should be passed without the leading "-D".
338 bool Arguments::is_internal_module_property(const char* property) {
339 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
340 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
341 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
342 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
343 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
344 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
345 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
346 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
348 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
349 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
350 return true;
351 }
352 }
353 return false;
354 }
355
356 // Process java launcher properties.
357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
359 // Must do this before setting up other system properties,
360 // as some of them may depend on launcher type.
361 for (int index = 0; index < args->nOptions; index++) {
362 const JavaVMOption* option = args->options + index;
363 const char* tail;
364
365 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
366 process_java_launcher_argument(tail, option->extraInfo);
367 continue;
368 }
369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
370 if (strcmp(tail, "true") == 0) {
371 _sun_java_launcher_is_altjvm = true;
372 }
373 continue;
374 }
375 }
376 }
377
378 // Initialize system properties key and value.
379 void Arguments::init_system_properties() {
380
381 // Set up _system_boot_class_path which is not a property but
382 // relies heavily on argument processing and the jdk.boot.class.path.append
383 // property. It is used to store the underlying system boot class path.
384 _system_boot_class_path = new PathString(NULL);
385
386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
387 "Java Virtual Machine Specification", false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
391
392 // Initialize the vm.info now, but it will need updating after argument parsing.
393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to NULL and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
399 _java_library_path = new SystemProperty("java.library.path", NULL, true);
400 _java_home = new SystemProperty("java.home", NULL, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414 PropertyList_add(&_system_properties, _vm_info);
415
416 // Set OS specific system properties values
417 os::init_system_properties_values();
418 }
419
420 // Update/Initialize System properties after JDK version number is known
421 void Arguments::init_version_specific_system_properties() {
422 enum { bufsz = 16 };
423 char buffer[bufsz];
424 const char* spec_vendor = "Oracle Corporation";
425 uint32_t spec_version = JDK_Version::current().major_version();
426
427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
428
429 PropertyList_add(&_system_properties,
430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.version", buffer, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
435 }
436
437 /*
438 * -XX argument processing:
439 *
440 * -XX arguments are defined in several places, such as:
441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
442 * -XX arguments are parsed in parse_argument().
443 * -XX argument bounds checking is done in check_vm_args_consistency().
444 *
445 * Over time -XX arguments may change. There are mechanisms to handle common cases:
446 *
447 * ALIASED: An option that is simply another name for another option. This is often
448 * part of the process of deprecating a flag, but not all aliases need
449 * to be deprecated.
450 *
451 * Create an alias for an option by adding the old and new option names to the
452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
453 *
454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
455 * support may be removed in the future. Both regular and aliased options may be
456 * deprecated.
457 *
458 * Add a deprecation warning for an option (or alias) by adding an entry in the
459 * "special_jvm_flags" table and setting the "deprecated_in" field.
460 * Often an option "deprecated" in one major release will
461 * be made "obsolete" in the next. In this case the entry should also have its
462 * "obsolete_in" field set.
463 *
464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
465 * on the command line. A warning is printed to let the user know that option might not
466 * be accepted in the future.
467 *
468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
469 * table and setting the "obsolete_in" field.
470 *
471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
472 * to the current JDK version. The system will flatly refuse to admit the existence of
473 * the flag. This allows a flag to die automatically over JDK releases.
474 *
475 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
477 * - Newly obsolete or expired deprecated options should have their global variable
478 * definitions removed (from globals.hpp, etc) and related implementations removed.
479 *
480 * Recommended approach for removing options:
481 *
482 * To remove options commonly used by customers (e.g. product -XX options), use
483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
484 *
485 * To remove internal options (e.g. diagnostic, experimental, develop options), use
486 * a 2-step model adding major release numbers to the obsolete and expire columns.
487 *
488 * To change the name of an option, use the alias table as well as a 2-step
489 * model adding major release numbers to the deprecate and expire columns.
490 * Think twice about aliasing commonly used customer options.
491 *
492 * There are times when it is appropriate to leave a future release number as undefined.
493 *
494 * Tests: Aliases should be tested in VMAliasOptions.java.
495 * Deprecated options should be tested in VMDeprecatedOptions.java.
496 */
497
498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
501 // the command-line as usual, but will issue a warning.
502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
503 // the command-line, while issuing a warning and ignoring the flag value.
504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
505 // existence of the flag.
506 //
507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
508 // This table ensures that the handling of options will update automatically when the JDK
509 // version is incremented, but the source code needs to be cleanup up manually:
510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
511 // variable should be removed, as well as users of the variable.
512 // - As "deprecated" options age into "obsolete" options, move the entry into the
513 // "Obsolete Flags" section of the table.
514 // - All expired options should be removed from the table.
515 static SpecialFlag const special_jvm_flags[] = {
516 // -------------- Deprecated Flags --------------
517 // --- Non-alias flags - sorted by obsolete_in then expired_in:
518 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
523 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
524 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
525 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
528 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
529 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
530 { "G1RSetScanBlockSize", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
531
532 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
533 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
536
537 // -------------- Obsolete Flags - sorted by expired_in --------------
538 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
539 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
540 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
541 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
542 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
543 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
544 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
545 { "TraceNMethodInstalls", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
546 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
547 { "UseConcMarkSweepGC", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
548 { "CMSAbortSemantics", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
549 { "CMSAbortablePrecleanMinWorkPerIteration", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
550 { "CMSBitMapYieldQuantum", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
551 { "CMSBootstrapOccupancy", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
552 { "CMSClassUnloadingEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
553 { "CMSClassUnloadingMaxInterval", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
554 { "CMSCleanOnEnter", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
555 { "CMSConcMarkMultiple", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
556 { "CMSConcurrentMTEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
557 { "CMSCoordinatorYieldSleepCount", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
558 { "CMSEdenChunksRecordAlways", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
559 { "CMSExpAvgFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
560 { "CMSExtrapolateSweep", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
561 { "CMSIncrementalSafetyFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
562 { "CMSIndexedFreeListReplenish", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
563 { "CMSInitiatingOccupancyFraction", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
564 { "CMSIsTooFullPercentage", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
565 { "CMSLargeCoalSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
566 { "CMSLargeSplitSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
567 { "CMSLoopWarn", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
568 { "CMSMaxAbortablePrecleanLoops", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
569 { "CMSMaxAbortablePrecleanTime", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
570 { "CMSOldPLABMax", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
571 { "CMSOldPLABMin", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
572 { "CMSOldPLABNumRefills", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
573 { "CMSOldPLABReactivityFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
574 { "CMSOldPLABResizeQuicker", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
575 { "CMSOldPLABToleranceFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
576 { "CMSPLABRecordAlways", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
577 { "CMSParallelInitialMarkEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
578 { "CMSParallelRemarkEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
579 { "CMSParallelSurvivorRemarkEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
580 { "CMSPrecleanDenominator", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
581 { "CMSPrecleanIter", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
582 { "CMSPrecleanNumerator", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
583 { "CMSPrecleanRefLists1", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
584 { "CMSPrecleanRefLists2", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
585 { "CMSPrecleanSurvivors1", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
586 { "CMSPrecleanSurvivors2", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
587 { "CMSPrecleanThreshold", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
588 { "CMSPrecleaningEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
589 { "CMSPrintChunksInDump", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
590 { "CMSPrintObjectsInDump", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
591 { "CMSRemarkVerifyVariant", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
592 { "CMSReplenishIntermediate", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
593 { "CMSRescanMultiple", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
594 { "CMSSamplingGrain", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
595 { "CMSScavengeBeforeRemark", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
596 { "CMSScheduleRemarkEdenPenetration", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
597 { "CMSScheduleRemarkEdenSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
598 { "CMSScheduleRemarkSamplingRatio", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
599 { "CMSSmallCoalSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
600 { "CMSSmallSplitSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
601 { "CMSSplitIndexedFreeListBlocks", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
602 { "CMSTriggerRatio", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
603 { "CMSWorkQueueDrainThreshold", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
604 { "CMSYield", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
605 { "CMSYieldSleepCount", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
606 { "CMSYoungGenPerWorker", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
607 { "CMS_FLSPadding", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
608 { "CMS_FLSWeight", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
609 { "CMS_SweepPadding", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
610 { "CMS_SweepTimerThresholdMillis", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
611 { "CMS_SweepWeight", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
612 { "FLSAlwaysCoalesceLarge", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
613 { "FLSCoalescePolicy", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
614 { "FLSLargestBlockCoalesceProximity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
615 { "OldPLABWeight", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
616 { "ParGCDesiredObjsFromOverflowList", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
617 { "ParGCTrimOverflow", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
618 { "ParGCUseLocalOverflow", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
619 { "ResizeOldPLAB", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
620 { "UseCMSBestFit", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
621 { "UseCMSInitiatingOccupancyOnly", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
622 { "GCLockerInvokesConcurrent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
623 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
624 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
625
626 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
627 // These entries will generate build errors. Their purpose is to test the macros.
628 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
629 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
630 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
631 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
632 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
633 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
634 #endif
635
636 { NULL, JDK_Version(0), JDK_Version(0) }
637 };
638
639 // Flags that are aliases for other flags.
640 typedef struct {
641 const char* alias_name;
642 const char* real_name;
643 } AliasedFlag;
644
645 static AliasedFlag const aliased_jvm_flags[] = {
646 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
647 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
648 { NULL, NULL}
649 };
650
651 // NOTE: A compatibility request will be necessary for each alias to be removed.
652 static AliasedLoggingFlag const aliased_logging_flags[] = {
653 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
654 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
655 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
656 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
657 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
658 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
659 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
660 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
661 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
662 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
663 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
664 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
665 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
666 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
667 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
668 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
669 };
670
671 #ifndef PRODUCT
672 // These options are removed in jdk9. Remove this code for jdk10.
673 static AliasedFlag const removed_develop_logging_flags[] = {
674 { "TraceClassInitialization", "-Xlog:class+init" },
675 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
676 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
677 { "TraceItables", "-Xlog:itables=debug" },
678 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
679 { "TraceSafepoint", "-Xlog:safepoint=debug" },
680 { "TraceStartupTime", "-Xlog:startuptime" },
681 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
682 { "PrintVtables", "-Xlog:vtables=debug" },
683 { "VerboseVerification", "-Xlog:verification" },
684 { NULL, NULL }
685 };
686 #endif //PRODUCT
687
688 // Return true if "v" is less than "other", where "other" may be "undefined".
689 static bool version_less_than(JDK_Version v, JDK_Version other) {
690 assert(!v.is_undefined(), "must be defined");
691 if (!other.is_undefined() && v.compare(other) >= 0) {
692 return false;
693 } else {
694 return true;
695 }
696 }
697
698 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
699 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
700 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
701 flag = special_jvm_flags[i];
702 return true;
703 }
704 }
705 return false;
706 }
707
708 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
709 assert(version != NULL, "Must provide a version buffer");
710 SpecialFlag flag;
711 if (lookup_special_flag(flag_name, flag)) {
712 if (!flag.obsolete_in.is_undefined()) {
713 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
714 *version = flag.obsolete_in;
715 return true;
716 }
717 }
718 }
719 return false;
720 }
721
722 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
723 assert(version != NULL, "Must provide a version buffer");
724 SpecialFlag flag;
725 if (lookup_special_flag(flag_name, flag)) {
726 if (!flag.deprecated_in.is_undefined()) {
727 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
728 version_less_than(JDK_Version::current(), flag.expired_in)) {
729 *version = flag.deprecated_in;
730 return 1;
731 } else {
732 return -1;
733 }
734 }
735 }
736 return 0;
737 }
738
739 #ifndef PRODUCT
740 const char* Arguments::removed_develop_logging_flag_name(const char* name){
741 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
742 const AliasedFlag& flag = removed_develop_logging_flags[i];
743 if (strcmp(flag.alias_name, name) == 0) {
744 return flag.real_name;
745 }
746 }
747 return NULL;
748 }
749 #endif // PRODUCT
750
751 const char* Arguments::real_flag_name(const char *flag_name) {
752 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
753 const AliasedFlag& flag_status = aliased_jvm_flags[i];
754 if (strcmp(flag_status.alias_name, flag_name) == 0) {
755 return flag_status.real_name;
756 }
757 }
758 return flag_name;
759 }
760
761 #ifdef ASSERT
762 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
763 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
764 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
765 return true;
766 }
767 }
768 return false;
769 }
770
771 // Verifies the correctness of the entries in the special_jvm_flags table.
772 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
773 // version being earlier than the deprecation version, then a warning is issued
774 // and verification fails - by returning false. If it is detected that the table
775 // is out of date, with respect to the current version, then a warning is issued
776 // but verification does not fail. This allows the VM to operate when the version
777 // is first updated, without needing to update all the impacted flags at the
778 // same time.
779 static bool verify_special_jvm_flags() {
780 bool success = true;
781 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
782 const SpecialFlag& flag = special_jvm_flags[i];
783 if (lookup_special_flag(flag.name, i)) {
784 warning("Duplicate special flag declaration \"%s\"", flag.name);
785 success = false;
786 }
787 if (flag.deprecated_in.is_undefined() &&
788 flag.obsolete_in.is_undefined()) {
789 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
790 success = false;
791 }
792
793 if (!flag.deprecated_in.is_undefined()) {
794 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
795 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
796 success = false;
797 }
798
799 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
800 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
801 success = false;
802 }
803 }
804
805 if (!flag.obsolete_in.is_undefined()) {
806 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
807 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
808 success = false;
809 }
810
811 // if flag has become obsolete it should not have a "globals" flag defined anymore.
812 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
813 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
814 // Temporarily disable the warning: 8196739
815 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
816 }
817 }
818 }
819
820 if (!flag.expired_in.is_undefined()) {
821 // if flag has become expired it should not have a "globals" flag defined anymore.
822 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
823 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
824 // Temporarily disable the warning: 8196739
825 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
826 }
827 }
828 }
829
830 }
831 return success;
832 }
833 #endif
834
835 // Parses a size specification string.
836 bool Arguments::atojulong(const char *s, julong* result) {
837 julong n = 0;
838
839 // First char must be a digit. Don't allow negative numbers or leading spaces.
840 if (!isdigit(*s)) {
841 return false;
842 }
843
844 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
845 char* remainder;
846 errno = 0;
847 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
848 if (errno != 0) {
849 return false;
850 }
851
852 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
853 if (remainder == s || strlen(remainder) > 1) {
854 return false;
855 }
856
857 switch (*remainder) {
858 case 'T': case 't':
859 *result = n * G * K;
860 // Check for overflow.
861 if (*result/((julong)G * K) != n) return false;
862 return true;
863 case 'G': case 'g':
864 *result = n * G;
865 if (*result/G != n) return false;
866 return true;
867 case 'M': case 'm':
868 *result = n * M;
869 if (*result/M != n) return false;
870 return true;
871 case 'K': case 'k':
872 *result = n * K;
873 if (*result/K != n) return false;
874 return true;
875 case '\0':
876 *result = n;
877 return true;
878 default:
879 return false;
880 }
881 }
882
883 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
884 if (size < min_size) return arg_too_small;
885 if (size > max_size) return arg_too_big;
886 return arg_in_range;
887 }
888
889 // Describe an argument out of range error
890 void Arguments::describe_range_error(ArgsRange errcode) {
891 switch(errcode) {
892 case arg_too_big:
893 jio_fprintf(defaultStream::error_stream(),
894 "The specified size exceeds the maximum "
895 "representable size.\n");
896 break;
897 case arg_too_small:
898 case arg_unreadable:
899 case arg_in_range:
900 // do nothing for now
901 break;
902 default:
903 ShouldNotReachHere();
904 }
905 }
906
907 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
908 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
909 return true;
910 } else {
911 return false;
912 }
913 }
914
915 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
916 char* end;
917 errno = 0;
918 double v = strtod(value, &end);
919 if ((errno != 0) || (*end != 0)) {
920 return false;
921 }
922
923 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
924 return true;
925 }
926 return false;
927 }
928
929 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
930 julong v;
931 int int_v;
932 intx intx_v;
933 bool is_neg = false;
934
935 if (flag == NULL) {
936 return false;
937 }
938
939 // Check the sign first since atojulong() parses only unsigned values.
940 if (*value == '-') {
941 if (!flag->is_intx() && !flag->is_int()) {
942 return false;
943 }
944 value++;
945 is_neg = true;
946 }
947 if (!Arguments::atojulong(value, &v)) {
948 return false;
949 }
950 if (flag->is_int()) {
951 int_v = (int) v;
952 if (is_neg) {
953 int_v = -int_v;
954 }
955 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
956 } else if (flag->is_uint()) {
957 uint uint_v = (uint) v;
958 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
959 } else if (flag->is_intx()) {
960 intx_v = (intx) v;
961 if (is_neg) {
962 intx_v = -intx_v;
963 }
964 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
965 } else if (flag->is_uintx()) {
966 uintx uintx_v = (uintx) v;
967 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
968 } else if (flag->is_uint64_t()) {
969 uint64_t uint64_t_v = (uint64_t) v;
970 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
971 } else if (flag->is_size_t()) {
972 size_t size_t_v = (size_t) v;
973 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
974 } else if (flag->is_double()) {
975 double double_v = (double) v;
976 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
977 } else {
978 return false;
979 }
980 }
981
982 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
983 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
984 // Contract: JVMFlag always returns a pointer that needs freeing.
985 FREE_C_HEAP_ARRAY(char, value);
986 return true;
987 }
988
989 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
990 const char* old_value = "";
991 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
992 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
993 size_t new_len = strlen(new_value);
994 const char* value;
995 char* free_this_too = NULL;
996 if (old_len == 0) {
997 value = new_value;
998 } else if (new_len == 0) {
999 value = old_value;
1000 } else {
1001 size_t length = old_len + 1 + new_len + 1;
1002 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
1003 // each new setting adds another LINE to the switch:
1004 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
1005 value = buf;
1006 free_this_too = buf;
1007 }
1008 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
1009 // JVMFlag always returns a pointer that needs freeing.
1010 FREE_C_HEAP_ARRAY(char, value);
1011 // JVMFlag made its own copy, so I must delete my own temp. buffer.
1012 FREE_C_HEAP_ARRAY(char, free_this_too);
1013 return true;
1014 }
1015
1016 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
1017 const char* real_name = real_flag_name(arg);
1018 JDK_Version since = JDK_Version();
1019 switch (is_deprecated_flag(arg, &since)) {
1020 case -1:
1021 return NULL; // obsolete or expired, don't process normally
1022 case 0:
1023 return real_name;
1024 case 1: {
1025 if (warn) {
1026 char version[256];
1027 since.to_string(version, sizeof(version));
1028 if (real_name != arg) {
1029 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
1030 arg, version, real_name);
1031 } else {
1032 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1033 arg, version);
1034 }
1035 }
1036 return real_name;
1037 }
1038 }
1039 ShouldNotReachHere();
1040 return NULL;
1041 }
1042
1043 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1044 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1045 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1046 const int max_tagset_size = 256;
1047 int max_tagset_len = max_tagset_size - 1;
1048 char tagset_buffer[max_tagset_size];
1049 tagset_buffer[0] = '\0';
1050
1051 // Write tag-set for aliased logging option, in string list form
1052 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1053 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1054 if (i > 0) {
1055 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1056 }
1057 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1058 }
1059 if (!alf.exactMatch) {
1060 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1061 }
1062 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1063 (on) ? "+" : "-",
1064 name,
1065 tagset_buffer,
1066 (on) ? LogLevel::name(alf.level) : "off");
1067 }
1068
1069 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1070 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1071 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1072 if (strcmp(alf.alias_name, name) == 0) {
1073 log_deprecated_flag(name, on, alf);
1074 return alf;
1075 }
1076 }
1077 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1078 return a;
1079 }
1080
1081 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1082
1083 // range of acceptable characters spelled out for portability reasons
1084 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1085 #define BUFLEN 255
1086 char name[BUFLEN+1];
1087 char dummy;
1088 const char* real_name;
1089 bool warn_if_deprecated = true;
1090
1091 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1092 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1093 if (alf.alias_name != NULL){
1094 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1095 return true;
1096 }
1097 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1098 if (real_name == NULL) {
1099 return false;
1100 }
1101 JVMFlag* flag = JVMFlag::find_flag(real_name);
1102 return set_bool_flag(flag, false, origin);
1103 }
1104 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1105 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1106 if (alf.alias_name != NULL){
1107 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1108 return true;
1109 }
1110 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1111 if (real_name == NULL) {
1112 return false;
1113 }
1114 JVMFlag* flag = JVMFlag::find_flag(real_name);
1115 return set_bool_flag(flag, true, origin);
1116 }
1117
1118 char punct;
1119 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1120 const char* value = strchr(arg, '=') + 1;
1121
1122 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1123 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1124 if (alf.alias_name != NULL) {
1125 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1126 return true;
1127 }
1128 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1129 if (real_name == NULL) {
1130 return false;
1131 }
1132 JVMFlag* flag = JVMFlag::find_flag(real_name);
1133 if (flag != NULL && flag->is_ccstr()) {
1134 if (flag->ccstr_accumulates()) {
1135 return append_to_string_flag(flag, value, origin);
1136 } else {
1137 if (value[0] == '\0') {
1138 value = NULL;
1139 }
1140 return set_string_flag(flag, value, origin);
1141 }
1142 } else {
1143 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1144 }
1145 }
1146
1147 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1148 const char* value = strchr(arg, '=') + 1;
1149 // -XX:Foo:=xxx will reset the string flag to the given value.
1150 if (value[0] == '\0') {
1151 value = NULL;
1152 }
1153 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1154 if (real_name == NULL) {
1155 return false;
1156 }
1157 JVMFlag* flag = JVMFlag::find_flag(real_name);
1158 return set_string_flag(flag, value, origin);
1159 }
1160
1161 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1162 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1163 #define NUMBER_RANGE "[0123456789eE+-]"
1164 char value[BUFLEN + 1];
1165 char value2[BUFLEN + 1];
1166 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1167 // Looks like a floating-point number -- try again with more lenient format string
1168 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1169 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1170 if (real_name == NULL) {
1171 return false;
1172 }
1173 JVMFlag* flag = JVMFlag::find_flag(real_name);
1174 return set_fp_numeric_flag(flag, value, origin);
1175 }
1176 }
1177
1178 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1179 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1180 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1181 if (real_name == NULL) {
1182 return false;
1183 }
1184 JVMFlag* flag = JVMFlag::find_flag(real_name);
1185 return set_numeric_flag(flag, value, origin);
1186 }
1187
1188 return false;
1189 }
1190
1191 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1192 assert(bldarray != NULL, "illegal argument");
1193
1194 if (arg == NULL) {
1195 return;
1196 }
1197
1198 int new_count = *count + 1;
1199
1200 // expand the array and add arg to the last element
1201 if (*bldarray == NULL) {
1202 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1203 } else {
1204 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1205 }
1206 (*bldarray)[*count] = os::strdup_check_oom(arg);
1207 *count = new_count;
1208 }
1209
1210 void Arguments::build_jvm_args(const char* arg) {
1211 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1212 }
1213
1214 void Arguments::build_jvm_flags(const char* arg) {
1215 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1216 }
1217
1218 // utility function to return a string that concatenates all
1219 // strings in a given char** array
1220 const char* Arguments::build_resource_string(char** args, int count) {
1221 if (args == NULL || count == 0) {
1222 return NULL;
1223 }
1224 size_t length = 0;
1225 for (int i = 0; i < count; i++) {
1226 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1227 }
1228 char* s = NEW_RESOURCE_ARRAY(char, length);
1229 char* dst = s;
1230 for (int j = 0; j < count; j++) {
1231 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1232 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1233 dst += offset;
1234 length -= offset;
1235 }
1236 return (const char*) s;
1237 }
1238
1239 void Arguments::print_on(outputStream* st) {
1240 st->print_cr("VM Arguments:");
1241 if (num_jvm_flags() > 0) {
1242 st->print("jvm_flags: "); print_jvm_flags_on(st);
1243 st->cr();
1244 }
1245 if (num_jvm_args() > 0) {
1246 st->print("jvm_args: "); print_jvm_args_on(st);
1247 st->cr();
1248 }
1249 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1250 if (_java_class_path != NULL) {
1251 char* path = _java_class_path->value();
1252 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1253 }
1254 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1255 }
1256
1257 void Arguments::print_summary_on(outputStream* st) {
1258 // Print the command line. Environment variables that are helpful for
1259 // reproducing the problem are written later in the hs_err file.
1260 // flags are from setting file
1261 if (num_jvm_flags() > 0) {
1262 st->print_raw("Settings File: ");
1263 print_jvm_flags_on(st);
1264 st->cr();
1265 }
1266 // args are the command line and environment variable arguments.
1267 st->print_raw("Command Line: ");
1268 if (num_jvm_args() > 0) {
1269 print_jvm_args_on(st);
1270 }
1271 // this is the classfile and any arguments to the java program
1272 if (java_command() != NULL) {
1273 st->print("%s", java_command());
1274 }
1275 st->cr();
1276 }
1277
1278 void Arguments::print_jvm_flags_on(outputStream* st) {
1279 if (_num_jvm_flags > 0) {
1280 for (int i=0; i < _num_jvm_flags; i++) {
1281 st->print("%s ", _jvm_flags_array[i]);
1282 }
1283 }
1284 }
1285
1286 void Arguments::print_jvm_args_on(outputStream* st) {
1287 if (_num_jvm_args > 0) {
1288 for (int i=0; i < _num_jvm_args; i++) {
1289 st->print("%s ", _jvm_args_array[i]);
1290 }
1291 }
1292 }
1293
1294 bool Arguments::process_argument(const char* arg,
1295 jboolean ignore_unrecognized,
1296 JVMFlag::Flags origin) {
1297 JDK_Version since = JDK_Version();
1298
1299 if (parse_argument(arg, origin)) {
1300 return true;
1301 }
1302
1303 // Determine if the flag has '+', '-', or '=' characters.
1304 bool has_plus_minus = (*arg == '+' || *arg == '-');
1305 const char* const argname = has_plus_minus ? arg + 1 : arg;
1306
1307 size_t arg_len;
1308 const char* equal_sign = strchr(argname, '=');
1309 if (equal_sign == NULL) {
1310 arg_len = strlen(argname);
1311 } else {
1312 arg_len = equal_sign - argname;
1313 }
1314
1315 // Only make the obsolete check for valid arguments.
1316 if (arg_len <= BUFLEN) {
1317 // Construct a string which consists only of the argument name without '+', '-', or '='.
1318 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1319 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1320 if (is_obsolete_flag(stripped_argname, &since)) {
1321 char version[256];
1322 since.to_string(version, sizeof(version));
1323 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1324 return true;
1325 }
1326 #ifndef PRODUCT
1327 else {
1328 const char* replacement;
1329 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1330 log_warning(arguments)("%s has been removed. Please use %s instead.",
1331 stripped_argname,
1332 replacement);
1333 return false;
1334 }
1335 }
1336 #endif //PRODUCT
1337 }
1338
1339 // For locked flags, report a custom error message if available.
1340 // Otherwise, report the standard unrecognized VM option.
1341 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1342 if (found_flag != NULL) {
1343 char locked_message_buf[BUFLEN];
1344 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1345 if (strlen(locked_message_buf) == 0) {
1346 if (found_flag->is_bool() && !has_plus_minus) {
1347 jio_fprintf(defaultStream::error_stream(),
1348 "Missing +/- setting for VM option '%s'\n", argname);
1349 } else if (!found_flag->is_bool() && has_plus_minus) {
1350 jio_fprintf(defaultStream::error_stream(),
1351 "Unexpected +/- setting in VM option '%s'\n", argname);
1352 } else {
1353 jio_fprintf(defaultStream::error_stream(),
1354 "Improperly specified VM option '%s'\n", argname);
1355 }
1356 } else {
1357 #ifdef PRODUCT
1358 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1359 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1360 if (ignore_unrecognized && mismatched) {
1361 return true;
1362 }
1363 #endif
1364 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1365 }
1366 } else {
1367 if (ignore_unrecognized) {
1368 return true;
1369 }
1370 jio_fprintf(defaultStream::error_stream(),
1371 "Unrecognized VM option '%s'\n", argname);
1372 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1373 if (fuzzy_matched != NULL) {
1374 jio_fprintf(defaultStream::error_stream(),
1375 "Did you mean '%s%s%s'? ",
1376 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1377 fuzzy_matched->_name,
1378 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1379 }
1380 }
1381
1382 // allow for commandline "commenting out" options like -XX:#+Verbose
1383 return arg[0] == '#';
1384 }
1385
1386 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1387 FILE* stream = fopen(file_name, "rb");
1388 if (stream == NULL) {
1389 if (should_exist) {
1390 jio_fprintf(defaultStream::error_stream(),
1391 "Could not open settings file %s\n", file_name);
1392 return false;
1393 } else {
1394 return true;
1395 }
1396 }
1397
1398 char token[1024];
1399 int pos = 0;
1400
1401 bool in_white_space = true;
1402 bool in_comment = false;
1403 bool in_quote = false;
1404 char quote_c = 0;
1405 bool result = true;
1406
1407 int c = getc(stream);
1408 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1409 if (in_white_space) {
1410 if (in_comment) {
1411 if (c == '\n') in_comment = false;
1412 } else {
1413 if (c == '#') in_comment = true;
1414 else if (!isspace(c)) {
1415 in_white_space = false;
1416 token[pos++] = c;
1417 }
1418 }
1419 } else {
1420 if (c == '\n' || (!in_quote && isspace(c))) {
1421 // token ends at newline, or at unquoted whitespace
1422 // this allows a way to include spaces in string-valued options
1423 token[pos] = '\0';
1424 logOption(token);
1425 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1426 build_jvm_flags(token);
1427 pos = 0;
1428 in_white_space = true;
1429 in_quote = false;
1430 } else if (!in_quote && (c == '\'' || c == '"')) {
1431 in_quote = true;
1432 quote_c = c;
1433 } else if (in_quote && (c == quote_c)) {
1434 in_quote = false;
1435 } else {
1436 token[pos++] = c;
1437 }
1438 }
1439 c = getc(stream);
1440 }
1441 if (pos > 0) {
1442 token[pos] = '\0';
1443 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1444 build_jvm_flags(token);
1445 }
1446 fclose(stream);
1447 return result;
1448 }
1449
1450 //=============================================================================================================
1451 // Parsing of properties (-D)
1452
1453 const char* Arguments::get_property(const char* key) {
1454 return PropertyList_get_value(system_properties(), key);
1455 }
1456
1457 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1458 const char* eq = strchr(prop, '=');
1459 const char* key;
1460 const char* value = "";
1461
1462 if (eq == NULL) {
1463 // property doesn't have a value, thus use passed string
1464 key = prop;
1465 } else {
1466 // property have a value, thus extract it and save to the
1467 // allocated string
1468 size_t key_len = eq - prop;
1469 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1470
1471 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1472 key = tmp_key;
1473
1474 value = &prop[key_len + 1];
1475 }
1476
1477 if (strcmp(key, "java.compiler") == 0) {
1478 process_java_compiler_argument(value);
1479 // Record value in Arguments, but let it get passed to Java.
1480 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1481 // sun.java.launcher.is_altjvm property is
1482 // private and is processed in process_sun_java_launcher_properties();
1483 // the sun.java.launcher property is passed on to the java application
1484 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1485 // append is true, writable is true, internal is false
1486 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1487 WriteableProperty, ExternalProperty);
1488 } else {
1489 if (strcmp(key, "sun.java.command") == 0) {
1490 char *old_java_command = _java_command;
1491 _java_command = os::strdup_check_oom(value, mtArguments);
1492 if (old_java_command != NULL) {
1493 os::free(old_java_command);
1494 }
1495 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1496 // If this property is set on the command line then its value will be
1497 // displayed in VM error logs as the URL at which to submit such logs.
1498 // Normally the URL displayed in error logs is different from the value
1499 // of this system property, so a different property should have been
1500 // used here, but we leave this as-is in case someone depends upon it.
1501 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1502 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1503 // its value without going through the property list or making a Java call.
1504 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1505 if (old_java_vendor_url_bug != NULL) {
1506 os::free((void *)old_java_vendor_url_bug);
1507 }
1508 }
1509
1510 // Create new property and add at the end of the list
1511 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1512 }
1513
1514 if (key != prop) {
1515 // SystemProperty copy passed value, thus free previously allocated
1516 // memory
1517 FreeHeap((void *)key);
1518 }
1519
1520 return true;
1521 }
1522
1523 #if INCLUDE_CDS
1524 const char* unsupported_properties[] = { "jdk.module.limitmods",
1525 "jdk.module.upgrade.path",
1526 "jdk.module.patch.0" };
1527 const char* unsupported_options[] = { "--limit-modules",
1528 "--upgrade-module-path",
1529 "--patch-module"
1530 };
1531 void Arguments::check_unsupported_dumping_properties() {
1532 assert(is_dumping_archive(),
1533 "this function is only used with CDS dump time");
1534 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1535 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1536 SystemProperty* sp = system_properties();
1537 while (sp != NULL) {
1538 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1539 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1540 vm_exit_during_initialization(
1541 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1542 }
1543 }
1544 sp = sp->next();
1545 }
1546
1547 // Check for an exploded module build in use with -Xshare:dump.
1548 if (!has_jimage()) {
1549 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1550 }
1551 }
1552
1553 bool Arguments::check_unsupported_cds_runtime_properties() {
1554 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1555 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1556 if (ArchiveClassesAtExit != NULL) {
1557 // dynamic dumping, just return false for now.
1558 // check_unsupported_dumping_properties() will be called later to check the same set of
1559 // properties, and will exit the VM with the correct error message if the unsupported properties
1560 // are used.
1561 return false;
1562 }
1563 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1564 if (get_property(unsupported_properties[i]) != NULL) {
1565 if (RequireSharedSpaces) {
1566 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1567 }
1568 return true;
1569 }
1570 }
1571 return false;
1572 }
1573 #endif
1574
1575 //===========================================================================================================
1576 // Setting int/mixed/comp mode flags
1577
1578 void Arguments::set_mode_flags(Mode mode) {
1579 // Set up default values for all flags.
1580 // If you add a flag to any of the branches below,
1581 // add a default value for it here.
1582 set_java_compiler(false);
1583 _mode = mode;
1584
1585 // Ensure Agent_OnLoad has the correct initial values.
1586 // This may not be the final mode; mode may change later in onload phase.
1587 PropertyList_unique_add(&_system_properties, "java.vm.info",
1588 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1589
1590 UseInterpreter = true;
1591 UseCompiler = true;
1592 UseLoopCounter = true;
1593
1594 // Default values may be platform/compiler dependent -
1595 // use the saved values
1596 ClipInlining = Arguments::_ClipInlining;
1597 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1598 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1599 BackgroundCompilation = Arguments::_BackgroundCompilation;
1600 if (TieredCompilation) {
1601 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1602 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1603 }
1604 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1605 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1606 }
1607 }
1608
1609 // Change from defaults based on mode
1610 switch (mode) {
1611 default:
1612 ShouldNotReachHere();
1613 break;
1614 case _int:
1615 UseCompiler = false;
1616 UseLoopCounter = false;
1617 AlwaysCompileLoopMethods = false;
1618 UseOnStackReplacement = false;
1619 break;
1620 case _mixed:
1621 // same as default
1622 break;
1623 case _comp:
1624 UseInterpreter = false;
1625 BackgroundCompilation = false;
1626 ClipInlining = false;
1627 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1628 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1629 // compile a level 4 (C2) and then continue executing it.
1630 if (TieredCompilation) {
1631 Tier3InvokeNotifyFreqLog = 0;
1632 Tier4InvocationThreshold = 0;
1633 }
1634 break;
1635 }
1636 }
1637
1638 // Conflict: required to use shared spaces (-Xshare:on), but
1639 // incompatible command line options were chosen.
1640 static void no_shared_spaces(const char* message) {
1641 if (RequireSharedSpaces) {
1642 jio_fprintf(defaultStream::error_stream(),
1643 "Class data sharing is inconsistent with other specified options.\n");
1644 vm_exit_during_initialization("Unable to use shared archive", message);
1645 } else {
1646 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1647 }
1648 }
1649
1650 void set_object_alignment() {
1651 // Object alignment.
1652 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1653 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1654 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1655 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1656 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1657 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1658
1659 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1660 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1661
1662 // Oop encoding heap max
1663 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1664
1665 if (SurvivorAlignmentInBytes == 0) {
1666 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1667 }
1668 }
1669
1670 size_t Arguments::max_heap_for_compressed_oops() {
1671 // Avoid sign flip.
1672 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1673 // We need to fit both the NULL page and the heap into the memory budget, while
1674 // keeping alignment constraints of the heap. To guarantee the latter, as the
1675 // NULL page is located before the heap, we pad the NULL page to the conservative
1676 // maximum alignment that the GC may ever impose upon the heap.
1677 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1678 _conservative_max_heap_alignment);
1679
1680 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1681 NOT_LP64(ShouldNotReachHere(); return 0);
1682 }
1683
1684 void Arguments::set_use_compressed_oops() {
1685 #ifndef ZERO
1686 #ifdef _LP64
1687 // MaxHeapSize is not set up properly at this point, but
1688 // the only value that can override MaxHeapSize if we are
1689 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1690 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1691
1692 if (max_heap_size <= max_heap_for_compressed_oops()) {
1693 #if !defined(COMPILER1) || defined(TIERED)
1694 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1695 FLAG_SET_ERGO(UseCompressedOops, true);
1696 }
1697 #endif
1698 } else {
1699 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1700 warning("Max heap size too large for Compressed Oops");
1701 FLAG_SET_DEFAULT(UseCompressedOops, false);
1702 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1703 }
1704 }
1705 #endif // _LP64
1706 #endif // ZERO
1707 }
1708
1709
1710 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1711 // set_use_compressed_oops().
1712 void Arguments::set_use_compressed_klass_ptrs() {
1713 #ifndef ZERO
1714 #ifdef _LP64
1715 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1716 if (!UseCompressedOops) {
1717 if (UseCompressedClassPointers) {
1718 warning("UseCompressedClassPointers requires UseCompressedOops");
1719 }
1720 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1721 } else {
1722 // Turn on UseCompressedClassPointers too
1723 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1724 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1725 }
1726 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1727 if (UseCompressedClassPointers) {
1728 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1729 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1730 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1731 }
1732 }
1733 }
1734 #endif // _LP64
1735 #endif // !ZERO
1736 }
1737
1738 void Arguments::set_conservative_max_heap_alignment() {
1739 // The conservative maximum required alignment for the heap is the maximum of
1740 // the alignments imposed by several sources: any requirements from the heap
1741 // itself and the maximum page size we may run the VM with.
1742 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1743 _conservative_max_heap_alignment = MAX4(heap_alignment,
1744 (size_t)os::vm_allocation_granularity(),
1745 os::max_page_size(),
1746 GCArguments::compute_heap_alignment());
1747 }
1748
1749 jint Arguments::set_ergonomics_flags() {
1750 GCConfig::initialize();
1751
1752 set_conservative_max_heap_alignment();
1753
1754 #ifndef ZERO
1755 #ifdef _LP64
1756 set_use_compressed_oops();
1757
1758 // set_use_compressed_klass_ptrs() must be called after calling
1759 // set_use_compressed_oops().
1760 set_use_compressed_klass_ptrs();
1761
1762 // Also checks that certain machines are slower with compressed oops
1763 // in vm_version initialization code.
1764 #endif // _LP64
1765 #endif // !ZERO
1766
1767 return JNI_OK;
1768 }
1769
1770 julong Arguments::limit_by_allocatable_memory(julong limit) {
1771 julong max_allocatable;
1772 julong result = limit;
1773 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1774 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1775 }
1776 return result;
1777 }
1778
1779 // Use static initialization to get the default before parsing
1780 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1781
1782 void Arguments::set_heap_size() {
1783 julong phys_mem;
1784
1785 // If the user specified one of these options, they
1786 // want specific memory sizing so do not limit memory
1787 // based on compressed oops addressability.
1788 // Also, memory limits will be calculated based on
1789 // available os physical memory, not our MaxRAM limit,
1790 // unless MaxRAM is also specified.
1791 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1792 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1793 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1794 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1795 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1796 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1797 !FLAG_IS_DEFAULT(MaxRAM));
1798 if (override_coop_limit) {
1799 if (FLAG_IS_DEFAULT(MaxRAM)) {
1800 phys_mem = os::physical_memory();
1801 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1802 } else {
1803 phys_mem = (julong)MaxRAM;
1804 }
1805 } else {
1806 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1807 : (julong)MaxRAM;
1808 }
1809
1810
1811 // Convert deprecated flags
1812 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1813 !FLAG_IS_DEFAULT(MaxRAMFraction))
1814 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1815
1816 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1817 !FLAG_IS_DEFAULT(MinRAMFraction))
1818 MinRAMPercentage = 100.0 / MinRAMFraction;
1819
1820 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1821 !FLAG_IS_DEFAULT(InitialRAMFraction))
1822 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1823
1824 // If the maximum heap size has not been set with -Xmx,
1825 // then set it as fraction of the size of physical memory,
1826 // respecting the maximum and minimum sizes of the heap.
1827 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1828 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1829 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1830 if (reasonable_min < MaxHeapSize) {
1831 // Small physical memory, so use a minimum fraction of it for the heap
1832 reasonable_max = reasonable_min;
1833 } else {
1834 // Not-small physical memory, so require a heap at least
1835 // as large as MaxHeapSize
1836 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1837 }
1838
1839 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1840 // Limit the heap size to ErgoHeapSizeLimit
1841 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1842 }
1843
1844 #ifdef _LP64
1845 if (UseCompressedOops) {
1846 // Limit the heap size to the maximum possible when using compressed oops
1847 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1848
1849 // HeapBaseMinAddress can be greater than default but not less than.
1850 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1851 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1852 // matches compressed oops printing flags
1853 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1854 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1855 DefaultHeapBaseMinAddress,
1856 DefaultHeapBaseMinAddress/G,
1857 HeapBaseMinAddress);
1858 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1859 }
1860 }
1861
1862 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1863 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1864 // but it should be not less than default MaxHeapSize.
1865 max_coop_heap -= HeapBaseMinAddress;
1866 }
1867
1868 // If user specified flags prioritizing os physical
1869 // memory limits, then disable compressed oops if
1870 // limits exceed max_coop_heap and UseCompressedOops
1871 // was not specified.
1872 if (reasonable_max > max_coop_heap) {
1873 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1874 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1875 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1876 "Please check the setting of MaxRAMPercentage %5.2f."
1877 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1878 FLAG_SET_ERGO(UseCompressedOops, false);
1879 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1880 } else {
1881 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1882 }
1883 }
1884 }
1885 #endif // _LP64
1886
1887 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1888
1889 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1890 // An initial heap size was specified on the command line,
1891 // so be sure that the maximum size is consistent. Done
1892 // after call to limit_by_allocatable_memory because that
1893 // method might reduce the allocation size.
1894 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1895 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1896 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1897 }
1898
1899 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1900 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1901 }
1902
1903 // If the minimum or initial heap_size have not been set or requested to be set
1904 // ergonomically, set them accordingly.
1905 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1906 julong reasonable_minimum = (julong)(OldSize + NewSize);
1907
1908 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1909
1910 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1911
1912 if (InitialHeapSize == 0) {
1913 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1914
1915 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1916 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1917
1918 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1919
1920 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1921 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1922 }
1923 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1924 // synchronize with InitialHeapSize to avoid errors with the default value.
1925 if (MinHeapSize == 0) {
1926 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1927 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1928 }
1929 }
1930 }
1931
1932 // This option inspects the machine and attempts to set various
1933 // parameters to be optimal for long-running, memory allocation
1934 // intensive jobs. It is intended for machines with large
1935 // amounts of cpu and memory.
1936 jint Arguments::set_aggressive_heap_flags() {
1937 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1938 // VM, but we may not be able to represent the total physical memory
1939 // available (like having 8gb of memory on a box but using a 32bit VM).
1940 // Thus, we need to make sure we're using a julong for intermediate
1941 // calculations.
1942 julong initHeapSize;
1943 julong total_memory = os::physical_memory();
1944
1945 if (total_memory < (julong) 256 * M) {
1946 jio_fprintf(defaultStream::error_stream(),
1947 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1948 vm_exit(1);
1949 }
1950
1951 // The heap size is half of available memory, or (at most)
1952 // all of possible memory less 160mb (leaving room for the OS
1953 // when using ISM). This is the maximum; because adaptive sizing
1954 // is turned on below, the actual space used may be smaller.
1955
1956 initHeapSize = MIN2(total_memory / (julong) 2,
1957 total_memory - (julong) 160 * M);
1958
1959 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1960
1961 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1962 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1963 return JNI_EINVAL;
1964 }
1965 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1966 return JNI_EINVAL;
1967 }
1968 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1969 return JNI_EINVAL;
1970 }
1971 }
1972 if (FLAG_IS_DEFAULT(NewSize)) {
1973 // Make the young generation 3/8ths of the total heap.
1974 if (FLAG_SET_CMDLINE(NewSize,
1975 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1976 return JNI_EINVAL;
1977 }
1978 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1979 return JNI_EINVAL;
1980 }
1981 }
1982
1983 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1984 FLAG_SET_DEFAULT(UseLargePages, true);
1985 #endif
1986
1987 // Increase some data structure sizes for efficiency
1988 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1989 return JNI_EINVAL;
1990 }
1991 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1992 return JNI_EINVAL;
1993 }
1994 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1995 return JNI_EINVAL;
1996 }
1997
1998 // See the OldPLABSize comment below, but replace 'after promotion'
1999 // with 'after copying'. YoungPLABSize is the size of the survivor
2000 // space per-gc-thread buffers. The default is 4kw.
2001 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2002 return JNI_EINVAL;
2003 }
2004
2005 // OldPLABSize is the size of the buffers in the old gen that
2006 // UseParallelGC uses to promote live data that doesn't fit in the
2007 // survivor spaces. At any given time, there's one for each gc thread.
2008 // The default size is 1kw. These buffers are rarely used, since the
2009 // survivor spaces are usually big enough. For specjbb, however, there
2010 // are occasions when there's lots of live data in the young gen
2011 // and we end up promoting some of it. We don't have a definite
2012 // explanation for why bumping OldPLABSize helps, but the theory
2013 // is that a bigger PLAB results in retaining something like the
2014 // original allocation order after promotion, which improves mutator
2015 // locality. A minor effect may be that larger PLABs reduce the
2016 // number of PLAB allocation events during gc. The value of 8kw
2017 // was arrived at by experimenting with specjbb.
2018 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2019 return JNI_EINVAL;
2020 }
2021
2022 // Enable parallel GC and adaptive generation sizing
2023 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
2024 return JNI_EINVAL;
2025 }
2026
2027 // Encourage steady state memory management
2028 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
2029 return JNI_EINVAL;
2030 }
2031
2032 // This appears to improve mutator locality
2033 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2034 return JNI_EINVAL;
2035 }
2036
2037 return JNI_OK;
2038 }
2039
2040 // This must be called after ergonomics.
2041 void Arguments::set_bytecode_flags() {
2042 if (!RewriteBytecodes) {
2043 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2044 }
2045 }
2046
2047 // Aggressive optimization flags
2048 jint Arguments::set_aggressive_opts_flags() {
2049 #ifdef COMPILER2
2050 if (AggressiveUnboxing) {
2051 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2052 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2053 } else if (!EliminateAutoBox) {
2054 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2055 AggressiveUnboxing = false;
2056 }
2057 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2058 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2059 } else if (!DoEscapeAnalysis) {
2060 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2061 AggressiveUnboxing = false;
2062 }
2063 }
2064 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2065 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2066 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2067 }
2068 // Feed the cache size setting into the JDK
2069 char buffer[1024];
2070 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2071 if (!add_property(buffer)) {
2072 return JNI_ENOMEM;
2073 }
2074 }
2075 #endif
2076
2077 return JNI_OK;
2078 }
2079
2080 //===========================================================================================================
2081 // Parsing of java.compiler property
2082
2083 void Arguments::process_java_compiler_argument(const char* arg) {
2084 // For backwards compatibility, Djava.compiler=NONE or ""
2085 // causes us to switch to -Xint mode UNLESS -Xdebug
2086 // is also specified.
2087 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2088 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2089 }
2090 }
2091
2092 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2093 _sun_java_launcher = os::strdup_check_oom(launcher);
2094 }
2095
2096 bool Arguments::created_by_java_launcher() {
2097 assert(_sun_java_launcher != NULL, "property must have value");
2098 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2099 }
2100
2101 bool Arguments::sun_java_launcher_is_altjvm() {
2102 return _sun_java_launcher_is_altjvm;
2103 }
2104
2105 //===========================================================================================================
2106 // Parsing of main arguments
2107
2108 unsigned int addreads_count = 0;
2109 unsigned int addexports_count = 0;
2110 unsigned int addopens_count = 0;
2111 unsigned int addmods_count = 0;
2112 unsigned int patch_mod_count = 0;
2113
2114 // Check the consistency of vm_init_args
2115 bool Arguments::check_vm_args_consistency() {
2116 // Method for adding checks for flag consistency.
2117 // The intent is to warn the user of all possible conflicts,
2118 // before returning an error.
2119 // Note: Needs platform-dependent factoring.
2120 bool status = true;
2121
2122 if (TLABRefillWasteFraction == 0) {
2123 jio_fprintf(defaultStream::error_stream(),
2124 "TLABRefillWasteFraction should be a denominator, "
2125 "not " SIZE_FORMAT "\n",
2126 TLABRefillWasteFraction);
2127 status = false;
2128 }
2129
2130 if (PrintNMTStatistics) {
2131 #if INCLUDE_NMT
2132 if (MemTracker::tracking_level() == NMT_off) {
2133 #endif // INCLUDE_NMT
2134 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2135 PrintNMTStatistics = false;
2136 #if INCLUDE_NMT
2137 }
2138 #endif
2139 }
2140
2141 status = CompilerConfig::check_args_consistency(status);
2142 #if INCLUDE_JVMCI
2143 if (status && EnableJVMCI) {
2144 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2145 AddProperty, UnwriteableProperty, InternalProperty);
2146 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2147 return false;
2148 }
2149 }
2150 #endif
2151
2152 #ifndef SUPPORT_RESERVED_STACK_AREA
2153 if (StackReservedPages != 0) {
2154 FLAG_SET_CMDLINE(StackReservedPages, 0);
2155 warning("Reserved Stack Area not supported on this platform");
2156 }
2157 #endif
2158
2159 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2160 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2161 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2162 }
2163 }
2164
2165 status = status && GCArguments::check_args_consistency();
2166
2167 return status;
2168 }
2169
2170 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2171 const char* option_type) {
2172 if (ignore) return false;
2173
2174 const char* spacer = " ";
2175 if (option_type == NULL) {
2176 option_type = ++spacer; // Set both to the empty string.
2177 }
2178
2179 jio_fprintf(defaultStream::error_stream(),
2180 "Unrecognized %s%soption: %s\n", option_type, spacer,
2181 option->optionString);
2182 return true;
2183 }
2184
2185 static const char* user_assertion_options[] = {
2186 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2187 };
2188
2189 static const char* system_assertion_options[] = {
2190 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2191 };
2192
2193 bool Arguments::parse_uintx(const char* value,
2194 uintx* uintx_arg,
2195 uintx min_size) {
2196
2197 // Check the sign first since atojulong() parses only unsigned values.
2198 bool value_is_positive = !(*value == '-');
2199
2200 if (value_is_positive) {
2201 julong n;
2202 bool good_return = atojulong(value, &n);
2203 if (good_return) {
2204 bool above_minimum = n >= min_size;
2205 bool value_is_too_large = n > max_uintx;
2206
2207 if (above_minimum && !value_is_too_large) {
2208 *uintx_arg = n;
2209 return true;
2210 }
2211 }
2212 }
2213 return false;
2214 }
2215
2216 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2217 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2218 char* property = AllocateHeap(prop_len, mtArguments);
2219 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2220 if (ret < 0 || ret >= (int)prop_len) {
2221 FreeHeap(property);
2222 return false;
2223 }
2224 bool added = add_property(property, UnwriteableProperty, internal);
2225 FreeHeap(property);
2226 return added;
2227 }
2228
2229 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2230 const unsigned int props_count_limit = 1000;
2231 const int max_digits = 3;
2232 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2233
2234 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2235 if (count < props_count_limit) {
2236 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2237 char* property = AllocateHeap(prop_len, mtArguments);
2238 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2239 if (ret < 0 || ret >= (int)prop_len) {
2240 FreeHeap(property);
2241 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2242 return false;
2243 }
2244 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2245 FreeHeap(property);
2246 return added;
2247 }
2248
2249 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2250 return false;
2251 }
2252
2253 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2254 julong* long_arg,
2255 julong min_size,
2256 julong max_size) {
2257 if (!atojulong(s, long_arg)) return arg_unreadable;
2258 return check_memory_size(*long_arg, min_size, max_size);
2259 }
2260
2261 // Parse JavaVMInitArgs structure
2262
2263 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2264 const JavaVMInitArgs *java_tool_options_args,
2265 const JavaVMInitArgs *java_options_args,
2266 const JavaVMInitArgs *cmd_line_args) {
2267 bool patch_mod_javabase = false;
2268
2269 // Save default settings for some mode flags
2270 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2271 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2272 Arguments::_ClipInlining = ClipInlining;
2273 Arguments::_BackgroundCompilation = BackgroundCompilation;
2274 if (TieredCompilation) {
2275 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2276 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2277 }
2278
2279 // CDS dumping always write the archive to the default value of SharedBaseAddress.
2280 Arguments::_SharedBaseAddress = SharedBaseAddress;
2281
2282 // Setup flags for mixed which is the default
2283 set_mode_flags(_mixed);
2284
2285 // Parse args structure generated from java.base vm options resource
2286 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2287 if (result != JNI_OK) {
2288 return result;
2289 }
2290
2291 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2292 // variable (if present).
2293 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2294 if (result != JNI_OK) {
2295 return result;
2296 }
2297
2298 // Parse args structure generated from the command line flags.
2299 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2300 if (result != JNI_OK) {
2301 return result;
2302 }
2303
2304 // Parse args structure generated from the _JAVA_OPTIONS environment
2305 // variable (if present) (mimics classic VM)
2306 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2307 if (result != JNI_OK) {
2308 return result;
2309 }
2310
2311 // We need to ensure processor and memory resources have been properly
2312 // configured - which may rely on arguments we just processed - before
2313 // doing the final argument processing. Any argument processing that
2314 // needs to know about processor and memory resources must occur after
2315 // this point.
2316
2317 os::init_container_support();
2318
2319 // Do final processing now that all arguments have been parsed
2320 result = finalize_vm_init_args(patch_mod_javabase);
2321 if (result != JNI_OK) {
2322 return result;
2323 }
2324
2325 return JNI_OK;
2326 }
2327
2328 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2329 // represents a valid JDWP agent. is_path==true denotes that we
2330 // are dealing with -agentpath (case where name is a path), otherwise with
2331 // -agentlib
2332 bool valid_jdwp_agent(char *name, bool is_path) {
2333 char *_name;
2334 const char *_jdwp = "jdwp";
2335 size_t _len_jdwp, _len_prefix;
2336
2337 if (is_path) {
2338 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2339 return false;
2340 }
2341
2342 _name++; // skip past last path separator
2343 _len_prefix = strlen(JNI_LIB_PREFIX);
2344
2345 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2346 return false;
2347 }
2348
2349 _name += _len_prefix;
2350 _len_jdwp = strlen(_jdwp);
2351
2352 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2353 _name += _len_jdwp;
2354 }
2355 else {
2356 return false;
2357 }
2358
2359 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2360 return false;
2361 }
2362
2363 return true;
2364 }
2365
2366 if (strcmp(name, _jdwp) == 0) {
2367 return true;
2368 }
2369
2370 return false;
2371 }
2372
2373 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2374 // --patch-module=<module>=<file>(<pathsep><file>)*
2375 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2376 // Find the equal sign between the module name and the path specification
2377 const char* module_equal = strchr(patch_mod_tail, '=');
2378 if (module_equal == NULL) {
2379 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2380 return JNI_ERR;
2381 } else {
2382 // Pick out the module name
2383 size_t module_len = module_equal - patch_mod_tail;
2384 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2385 if (module_name != NULL) {
2386 memcpy(module_name, patch_mod_tail, module_len);
2387 *(module_name + module_len) = '\0';
2388 // The path piece begins one past the module_equal sign
2389 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2390 FREE_C_HEAP_ARRAY(char, module_name);
2391 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2392 return JNI_ENOMEM;
2393 }
2394 } else {
2395 return JNI_ENOMEM;
2396 }
2397 }
2398 return JNI_OK;
2399 }
2400
2401 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2402 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2403 // The min and max sizes match the values in globals.hpp, but scaled
2404 // with K. The values have been chosen so that alignment with page
2405 // size doesn't change the max value, which makes the conversions
2406 // back and forth between Xss value and ThreadStackSize value easier.
2407 // The values have also been chosen to fit inside a 32-bit signed type.
2408 const julong min_ThreadStackSize = 0;
2409 const julong max_ThreadStackSize = 1 * M;
2410
2411 const julong min_size = min_ThreadStackSize * K;
2412 const julong max_size = max_ThreadStackSize * K;
2413
2414 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2415
2416 julong size = 0;
2417 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2418 if (errcode != arg_in_range) {
2419 bool silent = (option == NULL); // Allow testing to silence error messages
2420 if (!silent) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "Invalid thread stack size: %s\n", option->optionString);
2423 describe_range_error(errcode);
2424 }
2425 return JNI_EINVAL;
2426 }
2427
2428 // Internally track ThreadStackSize in units of 1024 bytes.
2429 const julong size_aligned = align_up(size, K);
2430 assert(size <= size_aligned,
2431 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2432 size, size_aligned);
2433
2434 const julong size_in_K = size_aligned / K;
2435 assert(size_in_K < (julong)max_intx,
2436 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2437 size_in_K);
2438
2439 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2440 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2441 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2442 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2443 max_expanded, size_in_K);
2444
2445 *out_ThreadStackSize = (intx)size_in_K;
2446
2447 return JNI_OK;
2448 }
2449
2450 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2451 // For match_option to return remaining or value part of option string
2452 const char* tail;
2453
2454 // iterate over arguments
2455 for (int index = 0; index < args->nOptions; index++) {
2456 bool is_absolute_path = false; // for -agentpath vs -agentlib
2457
2458 const JavaVMOption* option = args->options + index;
2459
2460 if (!match_option(option, "-Djava.class.path", &tail) &&
2461 !match_option(option, "-Dsun.java.command", &tail) &&
2462 !match_option(option, "-Dsun.java.launcher", &tail)) {
2463
2464 // add all jvm options to the jvm_args string. This string
2465 // is used later to set the java.vm.args PerfData string constant.
2466 // the -Djava.class.path and the -Dsun.java.command options are
2467 // omitted from jvm_args string as each have their own PerfData
2468 // string constant object.
2469 build_jvm_args(option->optionString);
2470 }
2471
2472 // -verbose:[class/module/gc/jni]
2473 if (match_option(option, "-verbose", &tail)) {
2474 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2475 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2476 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2477 } else if (!strcmp(tail, ":module")) {
2478 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2479 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2480 } else if (!strcmp(tail, ":gc")) {
2481 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2482 } else if (!strcmp(tail, ":jni")) {
2483 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2484 }
2485 // -da / -ea / -disableassertions / -enableassertions
2486 // These accept an optional class/package name separated by a colon, e.g.,
2487 // -da:java.lang.Thread.
2488 } else if (match_option(option, user_assertion_options, &tail, true)) {
2489 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2490 if (*tail == '\0') {
2491 JavaAssertions::setUserClassDefault(enable);
2492 } else {
2493 assert(*tail == ':', "bogus match by match_option()");
2494 JavaAssertions::addOption(tail + 1, enable);
2495 }
2496 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2497 } else if (match_option(option, system_assertion_options, &tail, false)) {
2498 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2499 JavaAssertions::setSystemClassDefault(enable);
2500 // -bootclasspath:
2501 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2502 jio_fprintf(defaultStream::output_stream(),
2503 "-Xbootclasspath is no longer a supported option.\n");
2504 return JNI_EINVAL;
2505 // -bootclasspath/a:
2506 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2507 Arguments::append_sysclasspath(tail);
2508 // -bootclasspath/p:
2509 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2510 jio_fprintf(defaultStream::output_stream(),
2511 "-Xbootclasspath/p is no longer a supported option.\n");
2512 return JNI_EINVAL;
2513 // -Xrun
2514 } else if (match_option(option, "-Xrun", &tail)) {
2515 if (tail != NULL) {
2516 const char* pos = strchr(tail, ':');
2517 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2518 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2519 jio_snprintf(name, len + 1, "%s", tail);
2520
2521 char *options = NULL;
2522 if(pos != NULL) {
2523 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2524 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2525 }
2526 #if !INCLUDE_JVMTI
2527 if (strcmp(name, "jdwp") == 0) {
2528 jio_fprintf(defaultStream::error_stream(),
2529 "Debugging agents are not supported in this VM\n");
2530 return JNI_ERR;
2531 }
2532 #endif // !INCLUDE_JVMTI
2533 add_init_library(name, options);
2534 }
2535 } else if (match_option(option, "--add-reads=", &tail)) {
2536 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2537 return JNI_ENOMEM;
2538 }
2539 } else if (match_option(option, "--add-exports=", &tail)) {
2540 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2541 return JNI_ENOMEM;
2542 }
2543 } else if (match_option(option, "--add-opens=", &tail)) {
2544 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2545 return JNI_ENOMEM;
2546 }
2547 } else if (match_option(option, "--add-modules=", &tail)) {
2548 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2549 return JNI_ENOMEM;
2550 }
2551 } else if (match_option(option, "--limit-modules=", &tail)) {
2552 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2553 return JNI_ENOMEM;
2554 }
2555 } else if (match_option(option, "--module-path=", &tail)) {
2556 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2557 return JNI_ENOMEM;
2558 }
2559 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2560 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2561 return JNI_ENOMEM;
2562 }
2563 } else if (match_option(option, "--patch-module=", &tail)) {
2564 // --patch-module=<module>=<file>(<pathsep><file>)*
2565 int res = process_patch_mod_option(tail, patch_mod_javabase);
2566 if (res != JNI_OK) {
2567 return res;
2568 }
2569 } else if (match_option(option, "--illegal-access=", &tail)) {
2570 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2571 return JNI_ENOMEM;
2572 }
2573 // -agentlib and -agentpath
2574 } else if (match_option(option, "-agentlib:", &tail) ||
2575 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2576 if(tail != NULL) {
2577 const char* pos = strchr(tail, '=');
2578 char* name;
2579 if (pos == NULL) {
2580 name = os::strdup_check_oom(tail, mtArguments);
2581 } else {
2582 size_t len = pos - tail;
2583 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2584 memcpy(name, tail, len);
2585 name[len] = '\0';
2586 }
2587
2588 char *options = NULL;
2589 if(pos != NULL) {
2590 options = os::strdup_check_oom(pos + 1, mtArguments);
2591 }
2592 #if !INCLUDE_JVMTI
2593 if (valid_jdwp_agent(name, is_absolute_path)) {
2594 jio_fprintf(defaultStream::error_stream(),
2595 "Debugging agents are not supported in this VM\n");
2596 return JNI_ERR;
2597 }
2598 #endif // !INCLUDE_JVMTI
2599 add_init_agent(name, options, is_absolute_path);
2600 }
2601 // -javaagent
2602 } else if (match_option(option, "-javaagent:", &tail)) {
2603 #if !INCLUDE_JVMTI
2604 jio_fprintf(defaultStream::error_stream(),
2605 "Instrumentation agents are not supported in this VM\n");
2606 return JNI_ERR;
2607 #else
2608 if (tail != NULL) {
2609 size_t length = strlen(tail) + 1;
2610 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2611 jio_snprintf(options, length, "%s", tail);
2612 add_instrument_agent("instrument", options, false);
2613 // java agents need module java.instrument
2614 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2615 return JNI_ENOMEM;
2616 }
2617 }
2618 #endif // !INCLUDE_JVMTI
2619 // --enable_preview
2620 } else if (match_option(option, "--enable-preview")) {
2621 set_enable_preview();
2622 // -Xnoclassgc
2623 } else if (match_option(option, "-Xnoclassgc")) {
2624 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2625 return JNI_EINVAL;
2626 }
2627 // -Xconcgc
2628 } else if (match_option(option, "-Xconcgc")) {
2629 warning("-Xconcgc uses UseConcMarkSweepGC; support was removed for both options in 14.0");
2630 // -Xnoconcgc
2631 } else if (match_option(option, "-Xnoconcgc")) {
2632 warning("-Xnoconcgc uses UseConcMarkSweepGC; support was removed for both options in 14.0");
2633 // -Xbatch
2634 } else if (match_option(option, "-Xbatch")) {
2635 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2636 return JNI_EINVAL;
2637 }
2638 // -Xmn for compatibility with other JVM vendors
2639 } else if (match_option(option, "-Xmn", &tail)) {
2640 julong long_initial_young_size = 0;
2641 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2642 if (errcode != arg_in_range) {
2643 jio_fprintf(defaultStream::error_stream(),
2644 "Invalid initial young generation size: %s\n", option->optionString);
2645 describe_range_error(errcode);
2646 return JNI_EINVAL;
2647 }
2648 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2649 return JNI_EINVAL;
2650 }
2651 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2652 return JNI_EINVAL;
2653 }
2654 // -Xms
2655 } else if (match_option(option, "-Xms", &tail)) {
2656 julong size = 0;
2657 // an initial heap size of 0 means automatically determine
2658 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2659 if (errcode != arg_in_range) {
2660 jio_fprintf(defaultStream::error_stream(),
2661 "Invalid initial heap size: %s\n", option->optionString);
2662 describe_range_error(errcode);
2663 return JNI_EINVAL;
2664 }
2665 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 // -Xmx
2672 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2673 julong long_max_heap_size = 0;
2674 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2675 if (errcode != arg_in_range) {
2676 jio_fprintf(defaultStream::error_stream(),
2677 "Invalid maximum heap size: %s\n", option->optionString);
2678 describe_range_error(errcode);
2679 return JNI_EINVAL;
2680 }
2681 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 // Xmaxf
2685 } else if (match_option(option, "-Xmaxf", &tail)) {
2686 char* err;
2687 int maxf = (int)(strtod(tail, &err) * 100);
2688 if (*err != '\0' || *tail == '\0') {
2689 jio_fprintf(defaultStream::error_stream(),
2690 "Bad max heap free percentage size: %s\n",
2691 option->optionString);
2692 return JNI_EINVAL;
2693 } else {
2694 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 }
2698 // Xminf
2699 } else if (match_option(option, "-Xminf", &tail)) {
2700 char* err;
2701 int minf = (int)(strtod(tail, &err) * 100);
2702 if (*err != '\0' || *tail == '\0') {
2703 jio_fprintf(defaultStream::error_stream(),
2704 "Bad min heap free percentage size: %s\n",
2705 option->optionString);
2706 return JNI_EINVAL;
2707 } else {
2708 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 }
2712 // -Xss
2713 } else if (match_option(option, "-Xss", &tail)) {
2714 intx value = 0;
2715 jint err = parse_xss(option, tail, &value);
2716 if (err != JNI_OK) {
2717 return err;
2718 }
2719 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2723 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2724 julong long_ReservedCodeCacheSize = 0;
2725
2726 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2727 if (errcode != arg_in_range) {
2728 jio_fprintf(defaultStream::error_stream(),
2729 "Invalid maximum code cache size: %s.\n", option->optionString);
2730 return JNI_EINVAL;
2731 }
2732 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 // -green
2736 } else if (match_option(option, "-green")) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Green threads support not available\n");
2739 return JNI_EINVAL;
2740 // -native
2741 } else if (match_option(option, "-native")) {
2742 // HotSpot always uses native threads, ignore silently for compatibility
2743 // -Xrs
2744 } else if (match_option(option, "-Xrs")) {
2745 // Classic/EVM option, new functionality
2746 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 // -Xprof
2750 } else if (match_option(option, "-Xprof")) {
2751 char version[256];
2752 // Obsolete in JDK 10
2753 JDK_Version::jdk(10).to_string(version, sizeof(version));
2754 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2755 // -Xinternalversion
2756 } else if (match_option(option, "-Xinternalversion")) {
2757 jio_fprintf(defaultStream::output_stream(), "%s\n",
2758 VM_Version::internal_vm_info_string());
2759 vm_exit(0);
2760 #ifndef PRODUCT
2761 // -Xprintflags
2762 } else if (match_option(option, "-Xprintflags")) {
2763 JVMFlag::printFlags(tty, false);
2764 vm_exit(0);
2765 #endif
2766 // -D
2767 } else if (match_option(option, "-D", &tail)) {
2768 const char* value;
2769 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2770 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2771 // abort if -Djava.endorsed.dirs is set
2772 jio_fprintf(defaultStream::output_stream(),
2773 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2774 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2775 return JNI_EINVAL;
2776 }
2777 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2778 *value != '\0' && strcmp(value, "\"\"") != 0) {
2779 // abort if -Djava.ext.dirs is set
2780 jio_fprintf(defaultStream::output_stream(),
2781 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2782 return JNI_EINVAL;
2783 }
2784 // Check for module related properties. They must be set using the modules
2785 // options. For example: use "--add-modules=java.sql", not
2786 // "-Djdk.module.addmods=java.sql"
2787 if (is_internal_module_property(option->optionString + 2)) {
2788 needs_module_property_warning = true;
2789 continue;
2790 }
2791 if (!add_property(tail)) {
2792 return JNI_ENOMEM;
2793 }
2794 // Out of the box management support
2795 if (match_option(option, "-Dcom.sun.management", &tail)) {
2796 #if INCLUDE_MANAGEMENT
2797 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 // management agent in module jdk.management.agent
2801 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2802 return JNI_ENOMEM;
2803 }
2804 #else
2805 jio_fprintf(defaultStream::output_stream(),
2806 "-Dcom.sun.management is not supported in this VM.\n");
2807 return JNI_ERR;
2808 #endif
2809 }
2810 // -Xint
2811 } else if (match_option(option, "-Xint")) {
2812 set_mode_flags(_int);
2813 // -Xmixed
2814 } else if (match_option(option, "-Xmixed")) {
2815 set_mode_flags(_mixed);
2816 // -Xcomp
2817 } else if (match_option(option, "-Xcomp")) {
2818 // for testing the compiler; turn off all flags that inhibit compilation
2819 set_mode_flags(_comp);
2820 // -Xshare:dump
2821 } else if (match_option(option, "-Xshare:dump")) {
2822 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2823 return JNI_EINVAL;
2824 }
2825 // -Xshare:on
2826 } else if (match_option(option, "-Xshare:on")) {
2827 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2828 return JNI_EINVAL;
2829 }
2830 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2834 } else if (match_option(option, "-Xshare:auto")) {
2835 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2836 return JNI_EINVAL;
2837 }
2838 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 // -Xshare:off
2842 } else if (match_option(option, "-Xshare:off")) {
2843 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2844 return JNI_EINVAL;
2845 }
2846 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2847 return JNI_EINVAL;
2848 }
2849 // -Xverify
2850 } else if (match_option(option, "-Xverify", &tail)) {
2851 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2852 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 } else if (strcmp(tail, ":remote") == 0) {
2859 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 } else if (strcmp(tail, ":none") == 0) {
2866 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2870 return JNI_EINVAL;
2871 }
2872 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2873 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2874 return JNI_EINVAL;
2875 }
2876 // -Xdebug
2877 } else if (match_option(option, "-Xdebug")) {
2878 // note this flag has been used, then ignore
2879 set_xdebug_mode(true);
2880 // -Xnoagent
2881 } else if (match_option(option, "-Xnoagent")) {
2882 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2883 } else if (match_option(option, "-Xloggc:", &tail)) {
2884 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2885 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2886 _gc_log_filename = os::strdup_check_oom(tail);
2887 } else if (match_option(option, "-Xlog", &tail)) {
2888 bool ret = false;
2889 if (strcmp(tail, ":help") == 0) {
2890 fileStream stream(defaultStream::output_stream());
2891 LogConfiguration::print_command_line_help(&stream);
2892 vm_exit(0);
2893 } else if (strcmp(tail, ":disable") == 0) {
2894 LogConfiguration::disable_logging();
2895 ret = true;
2896 } else if (*tail == '\0') {
2897 ret = LogConfiguration::parse_command_line_arguments();
2898 assert(ret, "-Xlog without arguments should never fail to parse");
2899 } else if (*tail == ':') {
2900 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2901 }
2902 if (ret == false) {
2903 jio_fprintf(defaultStream::error_stream(),
2904 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2905 tail);
2906 return JNI_EINVAL;
2907 }
2908 // JNI hooks
2909 } else if (match_option(option, "-Xcheck", &tail)) {
2910 if (!strcmp(tail, ":jni")) {
2911 #if !INCLUDE_JNI_CHECK
2912 warning("JNI CHECKING is not supported in this VM");
2913 #else
2914 CheckJNICalls = true;
2915 #endif // INCLUDE_JNI_CHECK
2916 } else if (is_bad_option(option, args->ignoreUnrecognized,
2917 "check")) {
2918 return JNI_EINVAL;
2919 }
2920 } else if (match_option(option, "vfprintf")) {
2921 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2922 } else if (match_option(option, "exit")) {
2923 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2924 } else if (match_option(option, "abort")) {
2925 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2926 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2927 // and the last option wins.
2928 } else if (match_option(option, "-XX:+NeverTenure")) {
2929 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2933 return JNI_EINVAL;
2934 }
2935 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2936 return JNI_EINVAL;
2937 }
2938 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2939 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2949 uintx max_tenuring_thresh = 0;
2950 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2953 return JNI_EINVAL;
2954 }
2955
2956 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959
2960 if (MaxTenuringThreshold == 0) {
2961 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2965 return JNI_EINVAL;
2966 }
2967 } else {
2968 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2969 return JNI_EINVAL;
2970 }
2971 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2972 return JNI_EINVAL;
2973 }
2974 }
2975 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2976 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2977 return JNI_EINVAL;
2978 }
2979 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2980 return JNI_EINVAL;
2981 }
2982 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2983 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2987 return JNI_EINVAL;
2988 }
2989 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2990 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2994 return JNI_EINVAL;
2995 }
2996 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2997 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2998 return JNI_EINVAL;
2999 }
3000 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3004 #if defined(DTRACE_ENABLED)
3005 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
3009 return JNI_EINVAL;
3010 }
3011 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
3015 return JNI_EINVAL;
3016 }
3017 #else // defined(DTRACE_ENABLED)
3018 jio_fprintf(defaultStream::error_stream(),
3019 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3020 return JNI_EINVAL;
3021 #endif // defined(DTRACE_ENABLED)
3022 #ifdef ASSERT
3023 } else if (match_option(option, "-XX:+FullGCALot")) {
3024 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 // disable scavenge before parallel mark-compact
3028 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
3029 return JNI_EINVAL;
3030 }
3031 #endif
3032 #if !INCLUDE_MANAGEMENT
3033 } else if (match_option(option, "-XX:+ManagementServer")) {
3034 jio_fprintf(defaultStream::error_stream(),
3035 "ManagementServer is not supported in this VM.\n");
3036 return JNI_ERR;
3037 #endif // INCLUDE_MANAGEMENT
3038 #if INCLUDE_JVMCI
3039 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
3040 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
3041 // Allow this flag if it has been unlocked.
3042 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
3043 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
3044 jio_fprintf(defaultStream::error_stream(),
3045 "Unable to enable JVMCI in product mode");
3046 return JNI_ERR;
3047 }
3048 }
3049 // The flag was locked so process normally to report that error
3050 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3051 return JNI_EINVAL;
3052 }
3053 #endif // INCLUDE_JVMCI
3054 #if INCLUDE_JFR
3055 } else if (match_jfr_option(&option)) {
3056 return JNI_EINVAL;
3057 #endif
3058 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3059 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3060 // already been handled
3061 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3062 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3063 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3064 return JNI_EINVAL;
3065 }
3066 }
3067 // Unknown option
3068 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3069 return JNI_ERR;
3070 }
3071 }
3072
3073 // PrintSharedArchiveAndExit will turn on
3074 // -Xshare:on
3075 // -Xlog:class+path=info
3076 if (PrintSharedArchiveAndExit) {
3077 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3084 }
3085
3086 fix_appclasspath();
3087
3088 return JNI_OK;
3089 }
3090
3091 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3092 // For java.base check for duplicate --patch-module options being specified on the command line.
3093 // This check is only required for java.base, all other duplicate module specifications
3094 // will be checked during module system initialization. The module system initialization
3095 // will throw an ExceptionInInitializerError if this situation occurs.
3096 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3097 if (*patch_mod_javabase) {
3098 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3099 } else {
3100 *patch_mod_javabase = true;
3101 }
3102 }
3103
3104 // Create GrowableArray lazily, only if --patch-module has been specified
3105 if (_patch_mod_prefix == NULL) {
3106 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3107 }
3108
3109 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3110 }
3111
3112 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3113 //
3114 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3115 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3116 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3117 // path is treated as the current directory.
3118 //
3119 // This causes problems with CDS, which requires that all directories specified in the classpath
3120 // must be empty. In most cases, applications do NOT want to load classes from the current
3121 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3122 // scripts compatible with CDS.
3123 void Arguments::fix_appclasspath() {
3124 if (IgnoreEmptyClassPaths) {
3125 const char separator = *os::path_separator();
3126 const char* src = _java_class_path->value();
3127
3128 // skip over all the leading empty paths
3129 while (*src == separator) {
3130 src ++;
3131 }
3132
3133 char* copy = os::strdup_check_oom(src, mtArguments);
3134
3135 // trim all trailing empty paths
3136 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3137 *tail = '\0';
3138 }
3139
3140 char from[3] = {separator, separator, '\0'};
3141 char to [2] = {separator, '\0'};
3142 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3143 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3144 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3145 }
3146
3147 _java_class_path->set_writeable_value(copy);
3148 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3149 }
3150 }
3151
3152 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3153 // check if the default lib/endorsed directory exists; if so, error
3154 char path[JVM_MAXPATHLEN];
3155 const char* fileSep = os::file_separator();
3156 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3157
3158 DIR* dir = os::opendir(path);
3159 if (dir != NULL) {
3160 jio_fprintf(defaultStream::output_stream(),
3161 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3162 "in modular form will be supported via the concept of upgradeable modules.\n");
3163 os::closedir(dir);
3164 return JNI_ERR;
3165 }
3166
3167 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3168 dir = os::opendir(path);
3169 if (dir != NULL) {
3170 jio_fprintf(defaultStream::output_stream(),
3171 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3172 "Use -classpath instead.\n.");
3173 os::closedir(dir);
3174 return JNI_ERR;
3175 }
3176
3177 // This must be done after all arguments have been processed
3178 // and the container support has been initialized since AggressiveHeap
3179 // relies on the amount of total memory available.
3180 if (AggressiveHeap) {
3181 jint result = set_aggressive_heap_flags();
3182 if (result != JNI_OK) {
3183 return result;
3184 }
3185 }
3186
3187 // This must be done after all arguments have been processed.
3188 // java_compiler() true means set to "NONE" or empty.
3189 if (java_compiler() && !xdebug_mode()) {
3190 // For backwards compatibility, we switch to interpreted mode if
3191 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3192 // not specified.
3193 set_mode_flags(_int);
3194 }
3195
3196 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3197 // but like -Xint, leave compilation thresholds unaffected.
3198 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3199 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3200 set_mode_flags(_int);
3201 }
3202
3203 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3204 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3205 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3206 }
3207
3208 #if !COMPILER2_OR_JVMCI
3209 // Don't degrade server performance for footprint
3210 if (FLAG_IS_DEFAULT(UseLargePages) &&
3211 MaxHeapSize < LargePageHeapSizeThreshold) {
3212 // No need for large granularity pages w/small heaps.
3213 // Note that large pages are enabled/disabled for both the
3214 // Java heap and the code cache.
3215 FLAG_SET_DEFAULT(UseLargePages, false);
3216 }
3217
3218 UNSUPPORTED_OPTION(ProfileInterpreter);
3219 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3220 #endif
3221
3222
3223 #ifdef TIERED
3224 // Parse the CompilationMode flag
3225 if (!CompilationModeFlag::initialize()) {
3226 return JNI_ERR;
3227 }
3228 #else
3229 // Tiered compilation is undefined.
3230 UNSUPPORTED_OPTION(TieredCompilation);
3231 #endif
3232
3233 if (!check_vm_args_consistency()) {
3234 return JNI_ERR;
3235 }
3236
3237 #if INCLUDE_CDS
3238 if (DumpSharedSpaces) {
3239 // Disable biased locking now as it interferes with the clean up of
3240 // the archived Klasses and Java string objects (at dump time only).
3241 UseBiasedLocking = false;
3242
3243 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3244 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3245 // compiler just to be safe.
3246 //
3247 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3248 // instead of modifying them in place. The copy is inaccessible to the compiler.
3249 // TODO: revisit the following for the static archive case.
3250 set_mode_flags(_int);
3251 }
3252 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3253 // Always verify non-system classes during CDS dump
3254 if (!BytecodeVerificationRemote) {
3255 BytecodeVerificationRemote = true;
3256 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3257 }
3258 }
3259 if (ArchiveClassesAtExit == NULL) {
3260 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3261 }
3262 if (UseSharedSpaces && patch_mod_javabase) {
3263 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3264 }
3265 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3266 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3267 }
3268 #endif
3269
3270 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3271 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3272 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3273
3274 return JNI_OK;
3275 }
3276
3277 // Helper class for controlling the lifetime of JavaVMInitArgs
3278 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3279 // deleted on the destruction of the ScopedVMInitArgs object.
3280 class ScopedVMInitArgs : public StackObj {
3281 private:
3282 JavaVMInitArgs _args;
3283 char* _container_name;
3284 bool _is_set;
3285 char* _vm_options_file_arg;
3286
3287 public:
3288 ScopedVMInitArgs(const char *container_name) {
3289 _args.version = JNI_VERSION_1_2;
3290 _args.nOptions = 0;
3291 _args.options = NULL;
3292 _args.ignoreUnrecognized = false;
3293 _container_name = (char *)container_name;
3294 _is_set = false;
3295 _vm_options_file_arg = NULL;
3296 }
3297
3298 // Populates the JavaVMInitArgs object represented by this
3299 // ScopedVMInitArgs object with the arguments in options. The
3300 // allocated memory is deleted by the destructor. If this method
3301 // returns anything other than JNI_OK, then this object is in a
3302 // partially constructed state, and should be abandoned.
3303 jint set_args(GrowableArray<JavaVMOption>* options) {
3304 _is_set = true;
3305 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3306 JavaVMOption, options->length(), mtArguments);
3307 if (options_arr == NULL) {
3308 return JNI_ENOMEM;
3309 }
3310 _args.options = options_arr;
3311
3312 for (int i = 0; i < options->length(); i++) {
3313 options_arr[i] = options->at(i);
3314 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3315 if (options_arr[i].optionString == NULL) {
3316 // Rely on the destructor to do cleanup.
3317 _args.nOptions = i;
3318 return JNI_ENOMEM;
3319 }
3320 }
3321
3322 _args.nOptions = options->length();
3323 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3324 return JNI_OK;
3325 }
3326
3327 JavaVMInitArgs* get() { return &_args; }
3328 char* container_name() { return _container_name; }
3329 bool is_set() { return _is_set; }
3330 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3331 char* vm_options_file_arg() { return _vm_options_file_arg; }
3332
3333 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3334 if (_vm_options_file_arg != NULL) {
3335 os::free(_vm_options_file_arg);
3336 }
3337 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3338 }
3339
3340 ~ScopedVMInitArgs() {
3341 if (_vm_options_file_arg != NULL) {
3342 os::free(_vm_options_file_arg);
3343 }
3344 if (_args.options == NULL) return;
3345 for (int i = 0; i < _args.nOptions; i++) {
3346 os::free(_args.options[i].optionString);
3347 }
3348 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3349 }
3350
3351 // Insert options into this option list, to replace option at
3352 // vm_options_file_pos (-XX:VMOptionsFile)
3353 jint insert(const JavaVMInitArgs* args,
3354 const JavaVMInitArgs* args_to_insert,
3355 const int vm_options_file_pos) {
3356 assert(_args.options == NULL, "shouldn't be set yet");
3357 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3358 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3359
3360 int length = args->nOptions + args_to_insert->nOptions - 1;
3361 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3362 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3363 for (int i = 0; i < args->nOptions; i++) {
3364 if (i == vm_options_file_pos) {
3365 // insert the new options starting at the same place as the
3366 // -XX:VMOptionsFile option
3367 for (int j = 0; j < args_to_insert->nOptions; j++) {
3368 options->push(args_to_insert->options[j]);
3369 }
3370 } else {
3371 options->push(args->options[i]);
3372 }
3373 }
3374 // make into options array
3375 jint result = set_args(options);
3376 delete options;
3377 return result;
3378 }
3379 };
3380
3381 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3382 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3383 }
3384
3385 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3386 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3387 }
3388
3389 jint Arguments::parse_options_environment_variable(const char* name,
3390 ScopedVMInitArgs* vm_args) {
3391 char *buffer = ::getenv(name);
3392
3393 // Don't check this environment variable if user has special privileges
3394 // (e.g. unix su command).
3395 if (buffer == NULL || os::have_special_privileges()) {
3396 return JNI_OK;
3397 }
3398
3399 if ((buffer = os::strdup(buffer)) == NULL) {
3400 return JNI_ENOMEM;
3401 }
3402
3403 jio_fprintf(defaultStream::error_stream(),
3404 "Picked up %s: %s\n", name, buffer);
3405
3406 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3407
3408 os::free(buffer);
3409 return retcode;
3410 }
3411
3412 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3413 // read file into buffer
3414 int fd = ::open(file_name, O_RDONLY);
3415 if (fd < 0) {
3416 jio_fprintf(defaultStream::error_stream(),
3417 "Could not open options file '%s'\n",
3418 file_name);
3419 return JNI_ERR;
3420 }
3421
3422 struct stat stbuf;
3423 int retcode = os::stat(file_name, &stbuf);
3424 if (retcode != 0) {
3425 jio_fprintf(defaultStream::error_stream(),
3426 "Could not stat options file '%s'\n",
3427 file_name);
3428 os::close(fd);
3429 return JNI_ERR;
3430 }
3431
3432 if (stbuf.st_size == 0) {
3433 // tell caller there is no option data and that is ok
3434 os::close(fd);
3435 return JNI_OK;
3436 }
3437
3438 // '+ 1' for NULL termination even with max bytes
3439 size_t bytes_alloc = stbuf.st_size + 1;
3440
3441 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3442 if (NULL == buf) {
3443 jio_fprintf(defaultStream::error_stream(),
3444 "Could not allocate read buffer for options file parse\n");
3445 os::close(fd);
3446 return JNI_ENOMEM;
3447 }
3448
3449 memset(buf, 0, bytes_alloc);
3450
3451 // Fill buffer
3452 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3453 os::close(fd);
3454 if (bytes_read < 0) {
3455 FREE_C_HEAP_ARRAY(char, buf);
3456 jio_fprintf(defaultStream::error_stream(),
3457 "Could not read options file '%s'\n", file_name);
3458 return JNI_ERR;
3459 }
3460
3461 if (bytes_read == 0) {
3462 // tell caller there is no option data and that is ok
3463 FREE_C_HEAP_ARRAY(char, buf);
3464 return JNI_OK;
3465 }
3466
3467 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3468
3469 FREE_C_HEAP_ARRAY(char, buf);
3470 return retcode;
3471 }
3472
3473 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3474 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3475
3476 // some pointers to help with parsing
3477 char *buffer_end = buffer + buf_len;
3478 char *opt_hd = buffer;
3479 char *wrt = buffer;
3480 char *rd = buffer;
3481
3482 // parse all options
3483 while (rd < buffer_end) {
3484 // skip leading white space from the input string
3485 while (rd < buffer_end && isspace(*rd)) {
3486 rd++;
3487 }
3488
3489 if (rd >= buffer_end) {
3490 break;
3491 }
3492
3493 // Remember this is where we found the head of the token.
3494 opt_hd = wrt;
3495
3496 // Tokens are strings of non white space characters separated
3497 // by one or more white spaces.
3498 while (rd < buffer_end && !isspace(*rd)) {
3499 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3500 int quote = *rd; // matching quote to look for
3501 rd++; // don't copy open quote
3502 while (rd < buffer_end && *rd != quote) {
3503 // include everything (even spaces)
3504 // up until the close quote
3505 *wrt++ = *rd++; // copy to option string
3506 }
3507
3508 if (rd < buffer_end) {
3509 rd++; // don't copy close quote
3510 } else {
3511 // did not see closing quote
3512 jio_fprintf(defaultStream::error_stream(),
3513 "Unmatched quote in %s\n", name);
3514 delete options;
3515 return JNI_ERR;
3516 }
3517 } else {
3518 *wrt++ = *rd++; // copy to option string
3519 }
3520 }
3521
3522 // steal a white space character and set it to NULL
3523 *wrt++ = '\0';
3524 // We now have a complete token
3525
3526 JavaVMOption option;
3527 option.optionString = opt_hd;
3528 option.extraInfo = NULL;
3529
3530 options->append(option); // Fill in option
3531
3532 rd++; // Advance to next character
3533 }
3534
3535 // Fill out JavaVMInitArgs structure.
3536 jint status = vm_args->set_args(options);
3537
3538 delete options;
3539 return status;
3540 }
3541
3542 void Arguments::set_shared_spaces_flags() {
3543 if (DumpSharedSpaces) {
3544 if (RequireSharedSpaces) {
3545 warning("Cannot dump shared archive while using shared archive");
3546 }
3547 UseSharedSpaces = false;
3548 #ifdef _LP64
3549 if (!UseCompressedOops || !UseCompressedClassPointers) {
3550 vm_exit_during_initialization(
3551 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3552 }
3553 } else {
3554 if (!UseCompressedOops || !UseCompressedClassPointers) {
3555 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3556 }
3557 #endif
3558 }
3559 }
3560
3561 #if INCLUDE_CDS
3562 // Sharing support
3563 // Construct the path to the archive
3564 char* Arguments::get_default_shared_archive_path() {
3565 char *default_archive_path;
3566 char jvm_path[JVM_MAXPATHLEN];
3567 os::jvm_path(jvm_path, sizeof(jvm_path));
3568 char *end = strrchr(jvm_path, *os::file_separator());
3569 if (end != NULL) *end = '\0';
3570 size_t jvm_path_len = strlen(jvm_path);
3571 size_t file_sep_len = strlen(os::file_separator());
3572 const size_t len = jvm_path_len + file_sep_len + 20;
3573 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3574 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3575 jvm_path, os::file_separator());
3576 return default_archive_path;
3577 }
3578
3579 int Arguments::num_archives(const char* archive_path) {
3580 if (archive_path == NULL) {
3581 return 0;
3582 }
3583 int npaths = 1;
3584 char* p = (char*)archive_path;
3585 while (*p != '\0') {
3586 if (*p == os::path_separator()[0]) {
3587 npaths++;
3588 }
3589 p++;
3590 }
3591 return npaths;
3592 }
3593
3594 void Arguments::extract_shared_archive_paths(const char* archive_path,
3595 char** base_archive_path,
3596 char** top_archive_path) {
3597 char* begin_ptr = (char*)archive_path;
3598 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3599 if (end_ptr == NULL || end_ptr == begin_ptr) {
3600 vm_exit_during_initialization("Base archive was not specified", archive_path);
3601 }
3602 size_t len = end_ptr - begin_ptr;
3603 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3604 strncpy(cur_path, begin_ptr, len);
3605 cur_path[len] = '\0';
3606 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3607 *base_archive_path = cur_path;
3608
3609 begin_ptr = ++end_ptr;
3610 if (*begin_ptr == '\0') {
3611 vm_exit_during_initialization("Top archive was not specified", archive_path);
3612 }
3613 end_ptr = strchr(begin_ptr, '\0');
3614 assert(end_ptr != NULL, "sanity");
3615 len = end_ptr - begin_ptr;
3616 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3617 strncpy(cur_path, begin_ptr, len + 1);
3618 //cur_path[len] = '\0';
3619 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3620 *top_archive_path = cur_path;
3621 }
3622
3623 bool Arguments::init_shared_archive_paths() {
3624 if (ArchiveClassesAtExit != NULL) {
3625 if (DumpSharedSpaces) {
3626 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3627 }
3628 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3629 return false;
3630 }
3631 check_unsupported_dumping_properties();
3632 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3633 }
3634 if (SharedArchiveFile == NULL) {
3635 SharedArchivePath = get_default_shared_archive_path();
3636 } else {
3637 int archives = num_archives(SharedArchiveFile);
3638 if (is_dumping_archive()) {
3639 if (archives > 1) {
3640 vm_exit_during_initialization(
3641 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3642 }
3643 if (DynamicDumpSharedSpaces) {
3644 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3645 vm_exit_during_initialization(
3646 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3647 SharedArchiveFile);
3648 }
3649 }
3650 }
3651 if (!is_dumping_archive()){
3652 if (archives > 2) {
3653 vm_exit_during_initialization(
3654 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3655 }
3656 if (archives == 1) {
3657 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3658 int name_size;
3659 bool success =
3660 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3661 if (!success) {
3662 SharedArchivePath = temp_archive_path;
3663 } else {
3664 SharedDynamicArchivePath = temp_archive_path;
3665 }
3666 } else {
3667 extract_shared_archive_paths((const char*)SharedArchiveFile,
3668 &SharedArchivePath, &SharedDynamicArchivePath);
3669 }
3670 } else { // CDS dumping
3671 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3672 }
3673 }
3674 return (SharedArchivePath != NULL);
3675 }
3676 #endif // INCLUDE_CDS
3677
3678 #ifndef PRODUCT
3679 // Determine whether LogVMOutput should be implicitly turned on.
3680 static bool use_vm_log() {
3681 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3682 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3683 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3684 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3685 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3686 return true;
3687 }
3688
3689 #ifdef COMPILER1
3690 if (PrintC1Statistics) {
3691 return true;
3692 }
3693 #endif // COMPILER1
3694
3695 #ifdef COMPILER2
3696 if (PrintOptoAssembly || PrintOptoStatistics) {
3697 return true;
3698 }
3699 #endif // COMPILER2
3700
3701 return false;
3702 }
3703
3704 #endif // PRODUCT
3705
3706 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3707 for (int index = 0; index < args->nOptions; index++) {
3708 const JavaVMOption* option = args->options + index;
3709 const char* tail;
3710 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3711 return true;
3712 }
3713 }
3714 return false;
3715 }
3716
3717 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3718 const char* vm_options_file,
3719 const int vm_options_file_pos,
3720 ScopedVMInitArgs* vm_options_file_args,
3721 ScopedVMInitArgs* args_out) {
3722 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3723 if (code != JNI_OK) {
3724 return code;
3725 }
3726
3727 if (vm_options_file_args->get()->nOptions < 1) {
3728 return JNI_OK;
3729 }
3730
3731 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3732 jio_fprintf(defaultStream::error_stream(),
3733 "A VM options file may not refer to a VM options file. "
3734 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3735 "options file '%s' in options container '%s' is an error.\n",
3736 vm_options_file_args->vm_options_file_arg(),
3737 vm_options_file_args->container_name());
3738 return JNI_EINVAL;
3739 }
3740
3741 return args_out->insert(args, vm_options_file_args->get(),
3742 vm_options_file_pos);
3743 }
3744
3745 // Expand -XX:VMOptionsFile found in args_in as needed.
3746 // mod_args and args_out parameters may return values as needed.
3747 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3748 ScopedVMInitArgs* mod_args,
3749 JavaVMInitArgs** args_out) {
3750 jint code = match_special_option_and_act(args_in, mod_args);
3751 if (code != JNI_OK) {
3752 return code;
3753 }
3754
3755 if (mod_args->is_set()) {
3756 // args_in contains -XX:VMOptionsFile and mod_args contains the
3757 // original options from args_in along with the options expanded
3758 // from the VMOptionsFile. Return a short-hand to the caller.
3759 *args_out = mod_args->get();
3760 } else {
3761 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3762 }
3763 return JNI_OK;
3764 }
3765
3766 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3767 ScopedVMInitArgs* args_out) {
3768 // Remaining part of option string
3769 const char* tail;
3770 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3771
3772 for (int index = 0; index < args->nOptions; index++) {
3773 const JavaVMOption* option = args->options + index;
3774 if (match_option(option, "-XX:Flags=", &tail)) {
3775 Arguments::set_jvm_flags_file(tail);
3776 continue;
3777 }
3778 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3779 if (vm_options_file_args.found_vm_options_file_arg()) {
3780 jio_fprintf(defaultStream::error_stream(),
3781 "The option '%s' is already specified in the options "
3782 "container '%s' so the specification of '%s' in the "
3783 "same options container is an error.\n",
3784 vm_options_file_args.vm_options_file_arg(),
3785 vm_options_file_args.container_name(),
3786 option->optionString);
3787 return JNI_EINVAL;
3788 }
3789 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3790 // If there's a VMOptionsFile, parse that
3791 jint code = insert_vm_options_file(args, tail, index,
3792 &vm_options_file_args, args_out);
3793 if (code != JNI_OK) {
3794 return code;
3795 }
3796 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3797 if (args_out->is_set()) {
3798 // The VMOptions file inserted some options so switch 'args'
3799 // to the new set of options, and continue processing which
3800 // preserves "last option wins" semantics.
3801 args = args_out->get();
3802 // The first option from the VMOptionsFile replaces the
3803 // current option. So we back track to process the
3804 // replacement option.
3805 index--;
3806 }
3807 continue;
3808 }
3809 if (match_option(option, "-XX:+PrintVMOptions")) {
3810 PrintVMOptions = true;
3811 continue;
3812 }
3813 if (match_option(option, "-XX:-PrintVMOptions")) {
3814 PrintVMOptions = false;
3815 continue;
3816 }
3817 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3818 IgnoreUnrecognizedVMOptions = true;
3819 continue;
3820 }
3821 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3822 IgnoreUnrecognizedVMOptions = false;
3823 continue;
3824 }
3825 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3826 JVMFlag::printFlags(tty, false);
3827 vm_exit(0);
3828 }
3829 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3830 #if INCLUDE_NMT
3831 // The launcher did not setup nmt environment variable properly.
3832 if (!MemTracker::check_launcher_nmt_support(tail)) {
3833 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3834 }
3835
3836 // Verify if nmt option is valid.
3837 if (MemTracker::verify_nmt_option()) {
3838 // Late initialization, still in single-threaded mode.
3839 if (MemTracker::tracking_level() >= NMT_summary) {
3840 MemTracker::init();
3841 }
3842 } else {
3843 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3844 }
3845 continue;
3846 #else
3847 jio_fprintf(defaultStream::error_stream(),
3848 "Native Memory Tracking is not supported in this VM\n");
3849 return JNI_ERR;
3850 #endif
3851 }
3852
3853 #ifndef PRODUCT
3854 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3855 JVMFlag::printFlags(tty, true);
3856 vm_exit(0);
3857 }
3858 #endif
3859 }
3860 return JNI_OK;
3861 }
3862
3863 static void print_options(const JavaVMInitArgs *args) {
3864 const char* tail;
3865 for (int index = 0; index < args->nOptions; index++) {
3866 const JavaVMOption *option = args->options + index;
3867 if (match_option(option, "-XX:", &tail)) {
3868 logOption(tail);
3869 }
3870 }
3871 }
3872
3873 bool Arguments::handle_deprecated_print_gc_flags() {
3874 if (PrintGC) {
3875 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3876 }
3877 if (PrintGCDetails) {
3878 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3879 }
3880
3881 if (_gc_log_filename != NULL) {
3882 // -Xloggc was used to specify a filename
3883 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3884
3885 LogTarget(Error, logging) target;
3886 LogStream errstream(target);
3887 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3888 } else if (PrintGC || PrintGCDetails) {
3889 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3890 }
3891 return true;
3892 }
3893
3894 // Parse entry point called from JNI_CreateJavaVM
3895
3896 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3897 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3898
3899 // Initialize ranges, constraints and writeables
3900 JVMFlagRangeList::init();
3901 JVMFlagConstraintList::init();
3902 JVMFlagWriteableList::init();
3903
3904 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3905 const char* hotspotrc = ".hotspotrc";
3906 bool settings_file_specified = false;
3907 bool needs_hotspotrc_warning = false;
3908 ScopedVMInitArgs initial_vm_options_args("");
3909 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3910 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3911
3912 // Pointers to current working set of containers
3913 JavaVMInitArgs* cur_cmd_args;
3914 JavaVMInitArgs* cur_vm_options_args;
3915 JavaVMInitArgs* cur_java_options_args;
3916 JavaVMInitArgs* cur_java_tool_options_args;
3917
3918 // Containers for modified/expanded options
3919 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3920 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3921 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3922 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3923
3924
3925 jint code =
3926 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3927 if (code != JNI_OK) {
3928 return code;
3929 }
3930
3931 code = parse_java_options_environment_variable(&initial_java_options_args);
3932 if (code != JNI_OK) {
3933 return code;
3934 }
3935
3936 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3937 char *vmoptions = ClassLoader::lookup_vm_options();
3938 if (vmoptions != NULL) {
3939 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3940 FREE_C_HEAP_ARRAY(char, vmoptions);
3941 if (code != JNI_OK) {
3942 return code;
3943 }
3944 }
3945
3946 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3947 &mod_java_tool_options_args,
3948 &cur_java_tool_options_args);
3949 if (code != JNI_OK) {
3950 return code;
3951 }
3952
3953 code = expand_vm_options_as_needed(initial_cmd_args,
3954 &mod_cmd_args,
3955 &cur_cmd_args);
3956 if (code != JNI_OK) {
3957 return code;
3958 }
3959
3960 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3961 &mod_java_options_args,
3962 &cur_java_options_args);
3963 if (code != JNI_OK) {
3964 return code;
3965 }
3966
3967 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3968 &mod_vm_options_args,
3969 &cur_vm_options_args);
3970 if (code != JNI_OK) {
3971 return code;
3972 }
3973
3974 const char* flags_file = Arguments::get_jvm_flags_file();
3975 settings_file_specified = (flags_file != NULL);
3976
3977 if (IgnoreUnrecognizedVMOptions) {
3978 cur_cmd_args->ignoreUnrecognized = true;
3979 cur_java_tool_options_args->ignoreUnrecognized = true;
3980 cur_java_options_args->ignoreUnrecognized = true;
3981 }
3982
3983 // Parse specified settings file
3984 if (settings_file_specified) {
3985 if (!process_settings_file(flags_file, true,
3986 cur_cmd_args->ignoreUnrecognized)) {
3987 return JNI_EINVAL;
3988 }
3989 } else {
3990 #ifdef ASSERT
3991 // Parse default .hotspotrc settings file
3992 if (!process_settings_file(".hotspotrc", false,
3993 cur_cmd_args->ignoreUnrecognized)) {
3994 return JNI_EINVAL;
3995 }
3996 #else
3997 struct stat buf;
3998 if (os::stat(hotspotrc, &buf) == 0) {
3999 needs_hotspotrc_warning = true;
4000 }
4001 #endif
4002 }
4003
4004 if (PrintVMOptions) {
4005 print_options(cur_java_tool_options_args);
4006 print_options(cur_cmd_args);
4007 print_options(cur_java_options_args);
4008 }
4009
4010 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4011 jint result = parse_vm_init_args(cur_vm_options_args,
4012 cur_java_tool_options_args,
4013 cur_java_options_args,
4014 cur_cmd_args);
4015
4016 if (result != JNI_OK) {
4017 return result;
4018 }
4019
4020 #if INCLUDE_CDS
4021 // Initialize shared archive paths which could include both base and dynamic archive paths
4022 if (!init_shared_archive_paths()) {
4023 return JNI_ENOMEM;
4024 }
4025 #endif
4026
4027 // Delay warning until here so that we've had a chance to process
4028 // the -XX:-PrintWarnings flag
4029 if (needs_hotspotrc_warning) {
4030 warning("%s file is present but has been ignored. "
4031 "Run with -XX:Flags=%s to load the file.",
4032 hotspotrc, hotspotrc);
4033 }
4034
4035 if (needs_module_property_warning) {
4036 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4037 " names that are reserved for internal use.");
4038 }
4039
4040 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4041 UNSUPPORTED_OPTION(UseLargePages);
4042 #endif
4043
4044 #if defined(AIX)
4045 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
4046 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
4047 #endif
4048
4049 #ifndef PRODUCT
4050 if (TraceBytecodesAt != 0) {
4051 TraceBytecodes = true;
4052 }
4053 if (CountCompiledCalls) {
4054 if (UseCounterDecay) {
4055 warning("UseCounterDecay disabled because CountCalls is set");
4056 UseCounterDecay = false;
4057 }
4058 }
4059 #endif // PRODUCT
4060
4061 if (ScavengeRootsInCode == 0) {
4062 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4063 warning("Forcing ScavengeRootsInCode non-zero");
4064 }
4065 ScavengeRootsInCode = 1;
4066 }
4067
4068 if (!handle_deprecated_print_gc_flags()) {
4069 return JNI_EINVAL;
4070 }
4071
4072 // Set object alignment values.
4073 set_object_alignment();
4074
4075 #if !INCLUDE_CDS
4076 if (DumpSharedSpaces || RequireSharedSpaces) {
4077 jio_fprintf(defaultStream::error_stream(),
4078 "Shared spaces are not supported in this VM\n");
4079 return JNI_ERR;
4080 }
4081 if (DumpLoadedClassList != NULL) {
4082 jio_fprintf(defaultStream::error_stream(),
4083 "DumpLoadedClassList is not supported in this VM\n");
4084 return JNI_ERR;
4085 }
4086 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4087 log_is_enabled(Info, cds)) {
4088 warning("Shared spaces are not supported in this VM");
4089 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4090 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4091 }
4092 no_shared_spaces("CDS Disabled");
4093 #endif // INCLUDE_CDS
4094
4095 #ifndef TIERED
4096 if (FLAG_IS_CMDLINE(CompilationMode)) {
4097 warning("CompilationMode has no effect in non-tiered VMs");
4098 }
4099 #endif
4100
4101 return JNI_OK;
4102 }
4103
4104 jint Arguments::apply_ergo() {
4105 // Set flags based on ergonomics.
4106 jint result = set_ergonomics_flags();
4107 if (result != JNI_OK) return result;
4108
4109 // Set heap size based on available physical memory
4110 set_heap_size();
4111
4112 GCConfig::arguments()->initialize();
4113
4114 set_shared_spaces_flags();
4115
4116 // Initialize Metaspace flags and alignments
4117 Metaspace::ergo_initialize();
4118
4119 // Set compiler flags after GC is selected and GC specific
4120 // flags (LoopStripMiningIter) are set.
4121 CompilerConfig::ergo_initialize();
4122
4123 // Set bytecode rewriting flags
4124 set_bytecode_flags();
4125
4126 // Set flags if aggressive optimization flags are enabled
4127 jint code = set_aggressive_opts_flags();
4128 if (code != JNI_OK) {
4129 return code;
4130 }
4131
4132 // Turn off biased locking for locking debug mode flags,
4133 // which are subtly different from each other but neither works with
4134 // biased locking
4135 if (UseHeavyMonitors
4136 #ifdef COMPILER1
4137 || !UseFastLocking
4138 #endif // COMPILER1
4139 #if INCLUDE_JVMCI
4140 || !JVMCIUseFastLocking
4141 #endif
4142 ) {
4143 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4144 // flag set to true on command line; warn the user that they
4145 // can't enable biased locking here
4146 warning("Biased Locking is not supported with locking debug flags"
4147 "; ignoring UseBiasedLocking flag." );
4148 }
4149 UseBiasedLocking = false;
4150 }
4151
4152 #ifdef CC_INTERP
4153 // Clear flags not supported on zero.
4154 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4155 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4156 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4157 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4158 #endif // CC_INTERP
4159
4160 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4161 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4162 DebugNonSafepoints = true;
4163 }
4164
4165 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4166 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4167 }
4168
4169 // Treat the odd case where local verification is enabled but remote
4170 // verification is not as if both were enabled.
4171 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4172 log_info(verification)("Turning on remote verification because local verification is on");
4173 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4174 }
4175
4176 #ifndef PRODUCT
4177 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4178 if (use_vm_log()) {
4179 LogVMOutput = true;
4180 }
4181 }
4182 #endif // PRODUCT
4183
4184 if (PrintCommandLineFlags) {
4185 JVMFlag::printSetFlags(tty);
4186 }
4187
4188 // Apply CPU specific policy for the BiasedLocking
4189 if (UseBiasedLocking) {
4190 if (!VM_Version::use_biased_locking() &&
4191 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4192 UseBiasedLocking = false;
4193 }
4194 }
4195 #ifdef COMPILER2
4196 if (!UseBiasedLocking) {
4197 UseOptoBiasInlining = false;
4198 }
4199 #endif
4200
4201 #if defined(IA32)
4202 // Only server compiler can optimize safepoints well enough.
4203 if (!is_server_compilation_mode_vm()) {
4204 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false);
4205 }
4206 #endif
4207
4208 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4209 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4210 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4211 } else {
4212 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4213 }
4214
4215 return JNI_OK;
4216 }
4217
4218 jint Arguments::adjust_after_os() {
4219 if (UseNUMA) {
4220 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4221 FLAG_SET_ERGO(UseNUMA, false);
4222 } else if (UseParallelGC || UseParallelOldGC) {
4223 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4224 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4225 }
4226 }
4227 // UseNUMAInterleaving is set to ON for all collectors and platforms when
4228 // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and
4229 // survivor spaces on top of NUMA allocation policy for the eden space.
4230 // Non NUMA-aware collectors will interleave all of the heap spaces across
4231 // NUMA nodes.
4232 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4233 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4234 }
4235 }
4236 return JNI_OK;
4237 }
4238
4239 int Arguments::PropertyList_count(SystemProperty* pl) {
4240 int count = 0;
4241 while(pl != NULL) {
4242 count++;
4243 pl = pl->next();
4244 }
4245 return count;
4246 }
4247
4248 // Return the number of readable properties.
4249 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4250 int count = 0;
4251 while(pl != NULL) {
4252 if (pl->is_readable()) {
4253 count++;
4254 }
4255 pl = pl->next();
4256 }
4257 return count;
4258 }
4259
4260 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4261 assert(key != NULL, "just checking");
4262 SystemProperty* prop;
4263 for (prop = pl; prop != NULL; prop = prop->next()) {
4264 if (strcmp(key, prop->key()) == 0) return prop->value();
4265 }
4266 return NULL;
4267 }
4268
4269 // Return the value of the requested property provided that it is a readable property.
4270 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4271 assert(key != NULL, "just checking");
4272 SystemProperty* prop;
4273 // Return the property value if the keys match and the property is not internal or
4274 // it's the special internal property "jdk.boot.class.path.append".
4275 for (prop = pl; prop != NULL; prop = prop->next()) {
4276 if (strcmp(key, prop->key()) == 0) {
4277 if (!prop->internal()) {
4278 return prop->value();
4279 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4280 return prop->value();
4281 } else {
4282 // Property is internal and not jdk.boot.class.path.append so return NULL.
4283 return NULL;
4284 }
4285 }
4286 }
4287 return NULL;
4288 }
4289
4290 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4291 int count = 0;
4292 const char* ret_val = NULL;
4293
4294 while(pl != NULL) {
4295 if(count >= index) {
4296 ret_val = pl->key();
4297 break;
4298 }
4299 count++;
4300 pl = pl->next();
4301 }
4302
4303 return ret_val;
4304 }
4305
4306 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4307 int count = 0;
4308 char* ret_val = NULL;
4309
4310 while(pl != NULL) {
4311 if(count >= index) {
4312 ret_val = pl->value();
4313 break;
4314 }
4315 count++;
4316 pl = pl->next();
4317 }
4318
4319 return ret_val;
4320 }
4321
4322 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4323 SystemProperty* p = *plist;
4324 if (p == NULL) {
4325 *plist = new_p;
4326 } else {
4327 while (p->next() != NULL) {
4328 p = p->next();
4329 }
4330 p->set_next(new_p);
4331 }
4332 }
4333
4334 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4335 bool writeable, bool internal) {
4336 if (plist == NULL)
4337 return;
4338
4339 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4340 PropertyList_add(plist, new_p);
4341 }
4342
4343 void Arguments::PropertyList_add(SystemProperty *element) {
4344 PropertyList_add(&_system_properties, element);
4345 }
4346
4347 // This add maintains unique property key in the list.
4348 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4349 PropertyAppendable append, PropertyWriteable writeable,
4350 PropertyInternal internal) {
4351 if (plist == NULL)
4352 return;
4353
4354 // If property key exist then update with new value.
4355 SystemProperty* prop;
4356 for (prop = *plist; prop != NULL; prop = prop->next()) {
4357 if (strcmp(k, prop->key()) == 0) {
4358 if (append == AppendProperty) {
4359 prop->append_value(v);
4360 } else {
4361 prop->set_value(v);
4362 }
4363 return;
4364 }
4365 }
4366
4367 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4368 }
4369
4370 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4371 // Returns true if all of the source pointed by src has been copied over to
4372 // the destination buffer pointed by buf. Otherwise, returns false.
4373 // Notes:
4374 // 1. If the length (buflen) of the destination buffer excluding the
4375 // NULL terminator character is not long enough for holding the expanded
4376 // pid characters, it also returns false instead of returning the partially
4377 // expanded one.
4378 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4379 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4380 char* buf, size_t buflen) {
4381 const char* p = src;
4382 char* b = buf;
4383 const char* src_end = &src[srclen];
4384 char* buf_end = &buf[buflen - 1];
4385
4386 while (p < src_end && b < buf_end) {
4387 if (*p == '%') {
4388 switch (*(++p)) {
4389 case '%': // "%%" ==> "%"
4390 *b++ = *p++;
4391 break;
4392 case 'p': { // "%p" ==> current process id
4393 // buf_end points to the character before the last character so
4394 // that we could write '\0' to the end of the buffer.
4395 size_t buf_sz = buf_end - b + 1;
4396 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4397
4398 // if jio_snprintf fails or the buffer is not long enough to hold
4399 // the expanded pid, returns false.
4400 if (ret < 0 || ret >= (int)buf_sz) {
4401 return false;
4402 } else {
4403 b += ret;
4404 assert(*b == '\0', "fail in copy_expand_pid");
4405 if (p == src_end && b == buf_end + 1) {
4406 // reach the end of the buffer.
4407 return true;
4408 }
4409 }
4410 p++;
4411 break;
4412 }
4413 default :
4414 *b++ = '%';
4415 }
4416 } else {
4417 *b++ = *p++;
4418 }
4419 }
4420 *b = '\0';
4421 return (p == src_end); // return false if not all of the source was copied
4422 }