1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "logging/logStream.hpp"
37 #include "logging/logTag.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/flags/jvmFlagAccess.hpp"
45 #include "runtime/globals_extension.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/os.inline.hpp"
48 #include "runtime/safepoint.hpp"
49 #include "runtime/safepointMechanism.hpp"
50 #include "runtime/vm_version.hpp"
51 #include "services/management.hpp"
52 #include "services/memTracker.hpp"
53 #include "utilities/align.hpp"
54 #include "utilities/defaultStream.hpp"
55 #include "utilities/macros.hpp"
56 #include "utilities/powerOfTwo.hpp"
57 #include "utilities/stringUtils.hpp"
58 #if INCLUDE_JFR
59 #include "jfr/jfr.hpp"
60 #endif
61
62 #define DEFAULT_JAVA_LAUNCHER "generic"
63
64 char* Arguments::_jvm_flags_file = NULL;
65 char** Arguments::_jvm_flags_array = NULL;
66 int Arguments::_num_jvm_flags = 0;
67 char** Arguments::_jvm_args_array = NULL;
68 int Arguments::_num_jvm_args = 0;
69 char* Arguments::_java_command = NULL;
70 SystemProperty* Arguments::_system_properties = NULL;
71 const char* Arguments::_gc_log_filename = NULL;
72 size_t Arguments::_conservative_max_heap_alignment = 0;
73 Arguments::Mode Arguments::_mode = _mixed;
74 bool Arguments::_java_compiler = false;
75 bool Arguments::_xdebug_mode = false;
76 const char* Arguments::_java_vendor_url_bug = NULL;
77 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
78 bool Arguments::_sun_java_launcher_is_altjvm = false;
79
80 // These parameters are reset in method parse_vm_init_args()
81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 bool Arguments::_ClipInlining = ClipInlining;
85 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
86 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
87 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
88
89 bool Arguments::_enable_preview = false;
90
91 char* Arguments::SharedArchivePath = NULL;
92 char* Arguments::SharedDynamicArchivePath = NULL;
93
94 AgentLibraryList Arguments::_libraryList;
95 AgentLibraryList Arguments::_agentList;
96
97 // These are not set by the JDK's built-in launchers, but they can be set by
98 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
99 // JavaVMOption in jni.h.
100 abort_hook_t Arguments::_abort_hook = NULL;
101 exit_hook_t Arguments::_exit_hook = NULL;
102 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
103
104
105 SystemProperty *Arguments::_sun_boot_library_path = NULL;
106 SystemProperty *Arguments::_java_library_path = NULL;
107 SystemProperty *Arguments::_java_home = NULL;
108 SystemProperty *Arguments::_java_class_path = NULL;
109 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
110 SystemProperty *Arguments::_vm_info = NULL;
111
112 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
113 PathString *Arguments::_system_boot_class_path = NULL;
114 bool Arguments::_has_jimage = false;
115
116 char* Arguments::_ext_dirs = NULL;
117
set_value(const char * value)118 bool PathString::set_value(const char *value) {
119 if (_value != NULL) {
120 FreeHeap(_value);
121 }
122 _value = AllocateHeap(strlen(value)+1, mtArguments);
123 assert(_value != NULL, "Unable to allocate space for new path value");
124 if (_value != NULL) {
125 strcpy(_value, value);
126 } else {
127 // not able to allocate
128 return false;
129 }
130 return true;
131 }
132
append_value(const char * value)133 void PathString::append_value(const char *value) {
134 char *sp;
135 size_t len = 0;
136 if (value != NULL) {
137 len = strlen(value);
138 if (_value != NULL) {
139 len += strlen(_value);
140 }
141 sp = AllocateHeap(len+2, mtArguments);
142 assert(sp != NULL, "Unable to allocate space for new append path value");
143 if (sp != NULL) {
144 if (_value != NULL) {
145 strcpy(sp, _value);
146 strcat(sp, os::path_separator());
147 strcat(sp, value);
148 FreeHeap(_value);
149 } else {
150 strcpy(sp, value);
151 }
152 _value = sp;
153 }
154 }
155 }
156
PathString(const char * value)157 PathString::PathString(const char* value) {
158 if (value == NULL) {
159 _value = NULL;
160 } else {
161 _value = AllocateHeap(strlen(value)+1, mtArguments);
162 strcpy(_value, value);
163 }
164 }
165
~PathString()166 PathString::~PathString() {
167 if (_value != NULL) {
168 FreeHeap(_value);
169 _value = NULL;
170 }
171 }
172
ModulePatchPath(const char * module_name,const char * path)173 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
174 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
175 size_t len = strlen(module_name) + 1;
176 _module_name = AllocateHeap(len, mtInternal);
177 strncpy(_module_name, module_name, len); // copy the trailing null
178 _path = new PathString(path);
179 }
180
~ModulePatchPath()181 ModulePatchPath::~ModulePatchPath() {
182 if (_module_name != NULL) {
183 FreeHeap(_module_name);
184 _module_name = NULL;
185 }
186 if (_path != NULL) {
187 delete _path;
188 _path = NULL;
189 }
190 }
191
SystemProperty(const char * key,const char * value,bool writeable,bool internal)192 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
193 if (key == NULL) {
194 _key = NULL;
195 } else {
196 _key = AllocateHeap(strlen(key)+1, mtArguments);
197 strcpy(_key, key);
198 }
199 _next = NULL;
200 _internal = internal;
201 _writeable = writeable;
202 }
203
AgentLibrary(const char * name,const char * options,bool is_absolute_path,void * os_lib,bool instrument_lib)204 AgentLibrary::AgentLibrary(const char* name, const char* options,
205 bool is_absolute_path, void* os_lib,
206 bool instrument_lib) {
207 _name = AllocateHeap(strlen(name)+1, mtArguments);
208 strcpy(_name, name);
209 if (options == NULL) {
210 _options = NULL;
211 } else {
212 _options = AllocateHeap(strlen(options)+1, mtArguments);
213 strcpy(_options, options);
214 }
215 _is_absolute_path = is_absolute_path;
216 _os_lib = os_lib;
217 _next = NULL;
218 _state = agent_invalid;
219 _is_static_lib = false;
220 _is_instrument_lib = instrument_lib;
221 }
222
223 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
224 // part of the option string.
match_option(const JavaVMOption * option,const char * name,const char ** tail)225 static bool match_option(const JavaVMOption *option, const char* name,
226 const char** tail) {
227 size_t len = strlen(name);
228 if (strncmp(option->optionString, name, len) == 0) {
229 *tail = option->optionString + len;
230 return true;
231 } else {
232 return false;
233 }
234 }
235
236 // Check if 'option' matches 'name'. No "tail" is allowed.
match_option(const JavaVMOption * option,const char * name)237 static bool match_option(const JavaVMOption *option, const char* name) {
238 const char* tail = NULL;
239 bool result = match_option(option, name, &tail);
240 if (tail != NULL && *tail == '\0') {
241 return result;
242 } else {
243 return false;
244 }
245 }
246
247 // Return true if any of the strings in null-terminated array 'names' matches.
248 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
249 // the option must match exactly.
match_option(const JavaVMOption * option,const char ** names,const char ** tail,bool tail_allowed)250 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
251 bool tail_allowed) {
252 for (/* empty */; *names != NULL; ++names) {
253 if (match_option(option, *names, tail)) {
254 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
255 return true;
256 }
257 }
258 }
259 return false;
260 }
261
262 #if INCLUDE_JFR
263 static bool _has_jfr_option = false; // is using JFR
264
265 // return true on failure
match_jfr_option(const JavaVMOption ** option)266 static bool match_jfr_option(const JavaVMOption** option) {
267 assert((*option)->optionString != NULL, "invariant");
268 char* tail = NULL;
269 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
270 _has_jfr_option = true;
271 return Jfr::on_start_flight_recording_option(option, tail);
272 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
273 _has_jfr_option = true;
274 return Jfr::on_flight_recorder_option(option, tail);
275 }
276 return false;
277 }
278
has_jfr_option()279 bool Arguments::has_jfr_option() {
280 return _has_jfr_option;
281 }
282 #endif
283
logOption(const char * opt)284 static void logOption(const char* opt) {
285 if (PrintVMOptions) {
286 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
287 }
288 }
289
290 bool needs_module_property_warning = false;
291
292 #define MODULE_PROPERTY_PREFIX "jdk.module."
293 #define MODULE_PROPERTY_PREFIX_LEN 11
294 #define ADDEXPORTS "addexports"
295 #define ADDEXPORTS_LEN 10
296 #define ADDREADS "addreads"
297 #define ADDREADS_LEN 8
298 #define ADDOPENS "addopens"
299 #define ADDOPENS_LEN 8
300 #define PATCH "patch"
301 #define PATCH_LEN 5
302 #define ADDMODS "addmods"
303 #define ADDMODS_LEN 7
304 #define LIMITMODS "limitmods"
305 #define LIMITMODS_LEN 9
306 #define PATH "path"
307 #define PATH_LEN 4
308 #define UPGRADE_PATH "upgrade.path"
309 #define UPGRADE_PATH_LEN 12
310
add_init_library(const char * name,char * options)311 void Arguments::add_init_library(const char* name, char* options) {
312 _libraryList.add(new AgentLibrary(name, options, false, NULL));
313 }
314
add_init_agent(const char * name,char * options,bool absolute_path)315 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
316 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
317 }
318
add_instrument_agent(const char * name,char * options,bool absolute_path)319 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
320 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
321 }
322
323 // Late-binding agents not started via arguments
add_loaded_agent(AgentLibrary * agentLib)324 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
325 _agentList.add(agentLib);
326 }
327
328 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
matches_property_suffix(const char * option,const char * property,size_t len)329 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
330 return ((strncmp(option, property, len) == 0) &&
331 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
332 }
333
334 // Return true if property starts with "jdk.module." and its ensuing chars match
335 // any of the reserved module properties.
336 // property should be passed without the leading "-D".
is_internal_module_property(const char * property)337 bool Arguments::is_internal_module_property(const char* property) {
338 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
339 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
340 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
341 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
342 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
343 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
344 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
345 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
346 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
347 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
348 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
349 return true;
350 }
351 }
352 return false;
353 }
354
355 // Process java launcher properties.
process_sun_java_launcher_properties(JavaVMInitArgs * args)356 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
357 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
358 // Must do this before setting up other system properties,
359 // as some of them may depend on launcher type.
360 for (int index = 0; index < args->nOptions; index++) {
361 const JavaVMOption* option = args->options + index;
362 const char* tail;
363
364 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
365 process_java_launcher_argument(tail, option->extraInfo);
366 continue;
367 }
368 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
369 if (strcmp(tail, "true") == 0) {
370 _sun_java_launcher_is_altjvm = true;
371 }
372 continue;
373 }
374 }
375 }
376
377 // Initialize system properties key and value.
init_system_properties()378 void Arguments::init_system_properties() {
379
380 // Set up _system_boot_class_path which is not a property but
381 // relies heavily on argument processing and the jdk.boot.class.path.append
382 // property. It is used to store the underlying system boot class path.
383 _system_boot_class_path = new PathString(NULL);
384
385 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
386 "Java Virtual Machine Specification", false));
387 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
390
391 // Initialize the vm.info now, but it will need updating after argument parsing.
392 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
393
394 // Following are JVMTI agent writable properties.
395 // Properties values are set to NULL and they are
396 // os specific they are initialized in os::init_system_properties_values().
397 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
398 _java_library_path = new SystemProperty("java.library.path", NULL, true);
399 _java_home = new SystemProperty("java.home", NULL, true);
400 _java_class_path = new SystemProperty("java.class.path", "", true);
401 // jdk.boot.class.path.append is a non-writeable, internal property.
402 // It can only be set by either:
403 // - -Xbootclasspath/a:
404 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
405 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
406
407 // Add to System Property list.
408 PropertyList_add(&_system_properties, _sun_boot_library_path);
409 PropertyList_add(&_system_properties, _java_library_path);
410 PropertyList_add(&_system_properties, _java_home);
411 PropertyList_add(&_system_properties, _java_class_path);
412 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
413 PropertyList_add(&_system_properties, _vm_info);
414
415 // Set OS specific system properties values
416 os::init_system_properties_values();
417 }
418
419 // Update/Initialize System properties after JDK version number is known
init_version_specific_system_properties()420 void Arguments::init_version_specific_system_properties() {
421 enum { bufsz = 16 };
422 char buffer[bufsz];
423 const char* spec_vendor = "Oracle Corporation";
424 uint32_t spec_version = JDK_Version::current().major_version();
425
426 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
427
428 PropertyList_add(&_system_properties,
429 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
430 PropertyList_add(&_system_properties,
431 new SystemProperty("java.vm.specification.version", buffer, false));
432 PropertyList_add(&_system_properties,
433 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
434 }
435
436 /*
437 * -XX argument processing:
438 *
439 * -XX arguments are defined in several places, such as:
440 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
441 * -XX arguments are parsed in parse_argument().
442 * -XX argument bounds checking is done in check_vm_args_consistency().
443 *
444 * Over time -XX arguments may change. There are mechanisms to handle common cases:
445 *
446 * ALIASED: An option that is simply another name for another option. This is often
447 * part of the process of deprecating a flag, but not all aliases need
448 * to be deprecated.
449 *
450 * Create an alias for an option by adding the old and new option names to the
451 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
452 *
453 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
454 * support may be removed in the future. Both regular and aliased options may be
455 * deprecated.
456 *
457 * Add a deprecation warning for an option (or alias) by adding an entry in the
458 * "special_jvm_flags" table and setting the "deprecated_in" field.
459 * Often an option "deprecated" in one major release will
460 * be made "obsolete" in the next. In this case the entry should also have its
461 * "obsolete_in" field set.
462 *
463 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
464 * on the command line. A warning is printed to let the user know that option might not
465 * be accepted in the future.
466 *
467 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
468 * table and setting the "obsolete_in" field.
469 *
470 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
471 * to the current JDK version. The system will flatly refuse to admit the existence of
472 * the flag. This allows a flag to die automatically over JDK releases.
473 *
474 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
475 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
476 * - Newly obsolete or expired deprecated options should have their global variable
477 * definitions removed (from globals.hpp, etc) and related implementations removed.
478 *
479 * Recommended approach for removing options:
480 *
481 * To remove options commonly used by customers (e.g. product -XX options), use
482 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
483 *
484 * To remove internal options (e.g. diagnostic, experimental, develop options), use
485 * a 2-step model adding major release numbers to the obsolete and expire columns.
486 *
487 * To change the name of an option, use the alias table as well as a 2-step
488 * model adding major release numbers to the deprecate and expire columns.
489 * Think twice about aliasing commonly used customer options.
490 *
491 * There are times when it is appropriate to leave a future release number as undefined.
492 *
493 * Tests: Aliases should be tested in VMAliasOptions.java.
494 * Deprecated options should be tested in VMDeprecatedOptions.java.
495 */
496
497 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
498 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
499 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
500 // the command-line as usual, but will issue a warning.
501 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
502 // the command-line, while issuing a warning and ignoring the flag value.
503 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
504 // existence of the flag.
505 //
506 // MANUAL CLEANUP ON JDK VERSION UPDATES:
507 // This table ensures that the handling of options will update automatically when the JDK
508 // version is incremented, but the source code needs to be cleanup up manually:
509 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
510 // variable should be removed, as well as users of the variable.
511 // - As "deprecated" options age into "obsolete" options, move the entry into the
512 // "Obsolete Flags" section of the table.
513 // - All expired options should be removed from the table.
514 static SpecialFlag const special_jvm_flags[] = {
515 // -------------- Deprecated Flags --------------
516 // --- Non-alias flags - sorted by obsolete_in then expired_in:
517 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
518 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
522 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
523 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "CriticalJNINatives", JDK_Version::jdk(16), JDK_Version::jdk(17), JDK_Version::jdk(18) },
525 { "UseBiasedLocking", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
526 { "BiasedLockingStartupDelay", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
527 { "PrintBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
528 { "BiasedLockingBulkRebiasThreshold", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
529 { "BiasedLockingBulkRevokeThreshold", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
530 { "BiasedLockingDecayTime", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
531 { "UseOptoBiasInlining", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
532 { "PrintPreciseBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
533
534 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
535 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
537 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
538
539 // -------------- Obsolete Flags - sorted by expired_in --------------
540 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
541 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
542 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
543 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
544 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
545 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
546 #ifdef BSD
547 { "UseBsdPosixThreadCPUClocks", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
548 { "UseOprofile", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
549 #endif
550 { "PrintVMQWaitTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
551 { "UseNewFieldLayout", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
552 { "UseSemaphoreGCThreadsSynchronization", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
553 { "ForceNUMA", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
554 { "InitialBootClassLoaderMetaspaceSize", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
555 { "UseLargePagesInMetaspace", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
556 { "InsertMemBarAfterArraycopy", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
557 { "Debugging", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
558 { "UseRDPCForConstantTableBase", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
559 { "VerifyMergedCPBytecodes", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
560 { "PrintSharedSpaces", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
561 { "TraceBiasedLocking", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
562 { "TraceClassLoading", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
563 { "TraceClassLoadingPreorder", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
564 { "TraceClassPaths", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
565 { "TraceClassResolution", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
566 { "TraceClassUnloading", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
567 { "TraceExceptions", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
568 { "TraceInvokeDynamic", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
569 { "TraceLoaderConstraints", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
570 { "TraceMethodHandles", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
571 { "TraceMonitorInflation", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
572 { "TraceSafepointCleanupTime", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
573 { "TraceJVMTIObjectTagging", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
574 { "TraceRedefineClasses", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
575 { "PrintJNIResolving", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
576
577 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
578 // These entries will generate build errors. Their purpose is to test the macros.
579 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
580 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
581 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
582 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
583 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
584 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
585 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
586 #endif
587
588 { NULL, JDK_Version(0), JDK_Version(0) }
589 };
590
591 // Flags that are aliases for other flags.
592 typedef struct {
593 const char* alias_name;
594 const char* real_name;
595 } AliasedFlag;
596
597 static AliasedFlag const aliased_jvm_flags[] = {
598 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
599 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
600 { NULL, NULL}
601 };
602
603 // Return true if "v" is less than "other", where "other" may be "undefined".
version_less_than(JDK_Version v,JDK_Version other)604 static bool version_less_than(JDK_Version v, JDK_Version other) {
605 assert(!v.is_undefined(), "must be defined");
606 if (!other.is_undefined() && v.compare(other) >= 0) {
607 return false;
608 } else {
609 return true;
610 }
611 }
612
lookup_special_flag(const char * flag_name,SpecialFlag & flag)613 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
614 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
615 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
616 flag = special_jvm_flags[i];
617 return true;
618 }
619 }
620 return false;
621 }
622
is_obsolete_flag(const char * flag_name,JDK_Version * version)623 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
624 assert(version != NULL, "Must provide a version buffer");
625 SpecialFlag flag;
626 if (lookup_special_flag(flag_name, flag)) {
627 if (!flag.obsolete_in.is_undefined()) {
628 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
629 *version = flag.obsolete_in;
630 // This flag may have been marked for obsoletion in this version, but we may not
631 // have actually removed it yet. Rather than ignoring it as soon as we reach
632 // this version we allow some time for the removal to happen. So if the flag
633 // still actually exists we process it as normal, but issue an adjusted warning.
634 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
635 if (real_flag != NULL) {
636 char version_str[256];
637 version->to_string(version_str, sizeof(version_str));
638 warning("Temporarily processing option %s; support is scheduled for removal in %s",
639 flag_name, version_str);
640 return false;
641 }
642 return true;
643 }
644 }
645 }
646 return false;
647 }
648
is_deprecated_flag(const char * flag_name,JDK_Version * version)649 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
650 assert(version != NULL, "Must provide a version buffer");
651 SpecialFlag flag;
652 if (lookup_special_flag(flag_name, flag)) {
653 if (!flag.deprecated_in.is_undefined()) {
654 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
655 version_less_than(JDK_Version::current(), flag.expired_in)) {
656 *version = flag.deprecated_in;
657 return 1;
658 } else {
659 return -1;
660 }
661 }
662 }
663 return 0;
664 }
665
real_flag_name(const char * flag_name)666 const char* Arguments::real_flag_name(const char *flag_name) {
667 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
668 const AliasedFlag& flag_status = aliased_jvm_flags[i];
669 if (strcmp(flag_status.alias_name, flag_name) == 0) {
670 return flag_status.real_name;
671 }
672 }
673 return flag_name;
674 }
675
676 #ifdef ASSERT
lookup_special_flag(const char * flag_name,size_t skip_index)677 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
678 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
679 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
680 return true;
681 }
682 }
683 return false;
684 }
685
686 // Verifies the correctness of the entries in the special_jvm_flags table.
687 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
688 // version being earlier than the deprecation version, then a warning is issued
689 // and verification fails - by returning false. If it is detected that the table
690 // is out of date, with respect to the current version, then ideally a warning is
691 // issued but verification does not fail. This allows the VM to operate when the
692 // version is first updated, without needing to update all the impacted flags at
693 // the same time. In practice we can't issue the warning immediately when the version
694 // is updated as it occurs for every test and some tests are not prepared to handle
695 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
696 // if the check_globals flag is true, and in addition allow a grace period and only
697 // check for stale flags when we hit build 25 (which is far enough into the 6 month
698 // release cycle that all flag updates should have been processed, whilst still
699 // leaving time to make the change before RDP2).
700 // We use a gtest to call this, passing true, so that we can detect stale flags before
701 // the end of the release cycle.
702
703 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
704
verify_special_jvm_flags(bool check_globals)705 bool Arguments::verify_special_jvm_flags(bool check_globals) {
706 bool success = true;
707 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
708 const SpecialFlag& flag = special_jvm_flags[i];
709 if (lookup_special_flag(flag.name, i)) {
710 warning("Duplicate special flag declaration \"%s\"", flag.name);
711 success = false;
712 }
713 if (flag.deprecated_in.is_undefined() &&
714 flag.obsolete_in.is_undefined()) {
715 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
716 success = false;
717 }
718
719 if (!flag.deprecated_in.is_undefined()) {
720 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
721 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
722 success = false;
723 }
724
725 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
726 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
727 success = false;
728 }
729 }
730
731 if (!flag.obsolete_in.is_undefined()) {
732 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
733 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
734 success = false;
735 }
736
737 // if flag has become obsolete it should not have a "globals" flag defined anymore.
738 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
739 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
740 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
741 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
742 success = false;
743 }
744 }
745
746 } else if (!flag.expired_in.is_undefined()) {
747 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
748 success = false;
749 }
750
751 if (!flag.expired_in.is_undefined()) {
752 // if flag has become expired it should not have a "globals" flag defined anymore.
753 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
754 !version_less_than(JDK_Version::current(), flag.expired_in)) {
755 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
756 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
757 success = false;
758 }
759 }
760 }
761 }
762 return success;
763 }
764 #endif
765
766 // Parses a size specification string.
atojulong(const char * s,julong * result)767 bool Arguments::atojulong(const char *s, julong* result) {
768 julong n = 0;
769
770 // First char must be a digit. Don't allow negative numbers or leading spaces.
771 if (!isdigit(*s)) {
772 return false;
773 }
774
775 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
776 char* remainder;
777 errno = 0;
778 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
779 if (errno != 0) {
780 return false;
781 }
782
783 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
784 if (remainder == s || strlen(remainder) > 1) {
785 return false;
786 }
787
788 switch (*remainder) {
789 case 'T': case 't':
790 *result = n * G * K;
791 // Check for overflow.
792 if (*result/((julong)G * K) != n) return false;
793 return true;
794 case 'G': case 'g':
795 *result = n * G;
796 if (*result/G != n) return false;
797 return true;
798 case 'M': case 'm':
799 *result = n * M;
800 if (*result/M != n) return false;
801 return true;
802 case 'K': case 'k':
803 *result = n * K;
804 if (*result/K != n) return false;
805 return true;
806 case '\0':
807 *result = n;
808 return true;
809 default:
810 return false;
811 }
812 }
813
check_memory_size(julong size,julong min_size,julong max_size)814 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
815 if (size < min_size) return arg_too_small;
816 if (size > max_size) return arg_too_big;
817 return arg_in_range;
818 }
819
820 // Describe an argument out of range error
describe_range_error(ArgsRange errcode)821 void Arguments::describe_range_error(ArgsRange errcode) {
822 switch(errcode) {
823 case arg_too_big:
824 jio_fprintf(defaultStream::error_stream(),
825 "The specified size exceeds the maximum "
826 "representable size.\n");
827 break;
828 case arg_too_small:
829 case arg_unreadable:
830 case arg_in_range:
831 // do nothing for now
832 break;
833 default:
834 ShouldNotReachHere();
835 }
836 }
837
set_bool_flag(JVMFlag * flag,bool value,JVMFlagOrigin origin)838 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
839 if (JVMFlagAccess::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
840 return true;
841 } else {
842 return false;
843 }
844 }
845
set_fp_numeric_flag(JVMFlag * flag,char * value,JVMFlagOrigin origin)846 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) {
847 char* end;
848 errno = 0;
849 double v = strtod(value, &end);
850 if ((errno != 0) || (*end != 0)) {
851 return false;
852 }
853
854 if (JVMFlagAccess::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
855 return true;
856 }
857 return false;
858 }
859
set_numeric_flag(JVMFlag * flag,char * value,JVMFlagOrigin origin)860 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) {
861 julong v;
862 int int_v;
863 intx intx_v;
864 bool is_neg = false;
865
866 if (flag == NULL) {
867 return false;
868 }
869
870 // Check the sign first since atojulong() parses only unsigned values.
871 if (*value == '-') {
872 if (!flag->is_intx() && !flag->is_int()) {
873 return false;
874 }
875 value++;
876 is_neg = true;
877 }
878 if (!Arguments::atojulong(value, &v)) {
879 return false;
880 }
881 if (flag->is_int()) {
882 int_v = (int) v;
883 if (is_neg) {
884 int_v = -int_v;
885 }
886 return JVMFlagAccess::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
887 } else if (flag->is_uint()) {
888 uint uint_v = (uint) v;
889 return JVMFlagAccess::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
890 } else if (flag->is_intx()) {
891 intx_v = (intx) v;
892 if (is_neg) {
893 intx_v = -intx_v;
894 }
895 return JVMFlagAccess::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
896 } else if (flag->is_uintx()) {
897 uintx uintx_v = (uintx) v;
898 return JVMFlagAccess::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
899 } else if (flag->is_uint64_t()) {
900 uint64_t uint64_t_v = (uint64_t) v;
901 return JVMFlagAccess::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
902 } else if (flag->is_size_t()) {
903 size_t size_t_v = (size_t) v;
904 return JVMFlagAccess::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
905 } else if (flag->is_double()) {
906 double double_v = (double) v;
907 return JVMFlagAccess::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
908 } else {
909 return false;
910 }
911 }
912
set_string_flag(JVMFlag * flag,const char * value,JVMFlagOrigin origin)913 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
914 if (JVMFlagAccess::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
915 // Contract: JVMFlag always returns a pointer that needs freeing.
916 FREE_C_HEAP_ARRAY(char, value);
917 return true;
918 }
919
append_to_string_flag(JVMFlag * flag,const char * new_value,JVMFlagOrigin origin)920 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
921 const char* old_value = "";
922 if (JVMFlagAccess::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
923 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
924 size_t new_len = strlen(new_value);
925 const char* value;
926 char* free_this_too = NULL;
927 if (old_len == 0) {
928 value = new_value;
929 } else if (new_len == 0) {
930 value = old_value;
931 } else {
932 size_t length = old_len + 1 + new_len + 1;
933 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
934 // each new setting adds another LINE to the switch:
935 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
936 value = buf;
937 free_this_too = buf;
938 }
939 (void) JVMFlagAccess::ccstrAtPut(flag, &value, origin);
940 // JVMFlag always returns a pointer that needs freeing.
941 FREE_C_HEAP_ARRAY(char, value);
942 // JVMFlag made its own copy, so I must delete my own temp. buffer.
943 FREE_C_HEAP_ARRAY(char, free_this_too);
944 return true;
945 }
946
handle_aliases_and_deprecation(const char * arg,bool warn)947 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
948 const char* real_name = real_flag_name(arg);
949 JDK_Version since = JDK_Version();
950 switch (is_deprecated_flag(arg, &since)) {
951 case -1: {
952 // Obsolete or expired, so don't process normally,
953 // but allow for an obsolete flag we're still
954 // temporarily allowing.
955 if (!is_obsolete_flag(arg, &since)) {
956 return real_name;
957 }
958 // Note if we're not considered obsolete then we can't be expired either
959 // as obsoletion must come first.
960 return NULL;
961 }
962 case 0:
963 return real_name;
964 case 1: {
965 if (warn) {
966 char version[256];
967 since.to_string(version, sizeof(version));
968 if (real_name != arg) {
969 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
970 arg, version, real_name);
971 } else {
972 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
973 arg, version);
974 }
975 }
976 return real_name;
977 }
978 }
979 ShouldNotReachHere();
980 return NULL;
981 }
982
parse_argument(const char * arg,JVMFlagOrigin origin)983 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
984
985 // range of acceptable characters spelled out for portability reasons
986 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
987 #define BUFLEN 255
988 char name[BUFLEN+1];
989 char dummy;
990 const char* real_name;
991 bool warn_if_deprecated = true;
992
993 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
994 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
995 if (real_name == NULL) {
996 return false;
997 }
998 JVMFlag* flag = JVMFlag::find_flag(real_name);
999 return set_bool_flag(flag, false, origin);
1000 }
1001 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1002 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1003 if (real_name == NULL) {
1004 return false;
1005 }
1006 JVMFlag* flag = JVMFlag::find_flag(real_name);
1007 return set_bool_flag(flag, true, origin);
1008 }
1009
1010 char punct;
1011 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1012 const char* value = strchr(arg, '=') + 1;
1013
1014 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1015 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1016 if (real_name == NULL) {
1017 return false;
1018 }
1019 JVMFlag* flag = JVMFlag::find_flag(real_name);
1020 if (flag != NULL && flag->is_ccstr()) {
1021 if (flag->ccstr_accumulates()) {
1022 return append_to_string_flag(flag, value, origin);
1023 } else {
1024 if (value[0] == '\0') {
1025 value = NULL;
1026 }
1027 return set_string_flag(flag, value, origin);
1028 }
1029 } else {
1030 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1031 }
1032 }
1033
1034 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1035 const char* value = strchr(arg, '=') + 1;
1036 // -XX:Foo:=xxx will reset the string flag to the given value.
1037 if (value[0] == '\0') {
1038 value = NULL;
1039 }
1040 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1041 if (real_name == NULL) {
1042 return false;
1043 }
1044 JVMFlag* flag = JVMFlag::find_flag(real_name);
1045 return set_string_flag(flag, value, origin);
1046 }
1047
1048 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1049 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1050 #define NUMBER_RANGE "[0123456789eE+-]"
1051 char value[BUFLEN + 1];
1052 char value2[BUFLEN + 1];
1053 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1054 // Looks like a floating-point number -- try again with more lenient format string
1055 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1056 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1057 if (real_name == NULL) {
1058 return false;
1059 }
1060 JVMFlag* flag = JVMFlag::find_flag(real_name);
1061 return set_fp_numeric_flag(flag, value, origin);
1062 }
1063 }
1064
1065 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1066 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1067 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1068 if (real_name == NULL) {
1069 return false;
1070 }
1071 JVMFlag* flag = JVMFlag::find_flag(real_name);
1072 return set_numeric_flag(flag, value, origin);
1073 }
1074
1075 return false;
1076 }
1077
add_string(char *** bldarray,int * count,const char * arg)1078 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1079 assert(bldarray != NULL, "illegal argument");
1080
1081 if (arg == NULL) {
1082 return;
1083 }
1084
1085 int new_count = *count + 1;
1086
1087 // expand the array and add arg to the last element
1088 if (*bldarray == NULL) {
1089 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1090 } else {
1091 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1092 }
1093 (*bldarray)[*count] = os::strdup_check_oom(arg);
1094 *count = new_count;
1095 }
1096
build_jvm_args(const char * arg)1097 void Arguments::build_jvm_args(const char* arg) {
1098 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1099 }
1100
build_jvm_flags(const char * arg)1101 void Arguments::build_jvm_flags(const char* arg) {
1102 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1103 }
1104
1105 // utility function to return a string that concatenates all
1106 // strings in a given char** array
build_resource_string(char ** args,int count)1107 const char* Arguments::build_resource_string(char** args, int count) {
1108 if (args == NULL || count == 0) {
1109 return NULL;
1110 }
1111 size_t length = 0;
1112 for (int i = 0; i < count; i++) {
1113 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1114 }
1115 char* s = NEW_RESOURCE_ARRAY(char, length);
1116 char* dst = s;
1117 for (int j = 0; j < count; j++) {
1118 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1119 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1120 dst += offset;
1121 length -= offset;
1122 }
1123 return (const char*) s;
1124 }
1125
print_on(outputStream * st)1126 void Arguments::print_on(outputStream* st) {
1127 st->print_cr("VM Arguments:");
1128 if (num_jvm_flags() > 0) {
1129 st->print("jvm_flags: "); print_jvm_flags_on(st);
1130 st->cr();
1131 }
1132 if (num_jvm_args() > 0) {
1133 st->print("jvm_args: "); print_jvm_args_on(st);
1134 st->cr();
1135 }
1136 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1137 if (_java_class_path != NULL) {
1138 char* path = _java_class_path->value();
1139 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1140 }
1141 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1142 }
1143
print_summary_on(outputStream * st)1144 void Arguments::print_summary_on(outputStream* st) {
1145 // Print the command line. Environment variables that are helpful for
1146 // reproducing the problem are written later in the hs_err file.
1147 // flags are from setting file
1148 if (num_jvm_flags() > 0) {
1149 st->print_raw("Settings File: ");
1150 print_jvm_flags_on(st);
1151 st->cr();
1152 }
1153 // args are the command line and environment variable arguments.
1154 st->print_raw("Command Line: ");
1155 if (num_jvm_args() > 0) {
1156 print_jvm_args_on(st);
1157 }
1158 // this is the classfile and any arguments to the java program
1159 if (java_command() != NULL) {
1160 st->print("%s", java_command());
1161 }
1162 st->cr();
1163 }
1164
print_jvm_flags_on(outputStream * st)1165 void Arguments::print_jvm_flags_on(outputStream* st) {
1166 if (_num_jvm_flags > 0) {
1167 for (int i=0; i < _num_jvm_flags; i++) {
1168 st->print("%s ", _jvm_flags_array[i]);
1169 }
1170 }
1171 }
1172
print_jvm_args_on(outputStream * st)1173 void Arguments::print_jvm_args_on(outputStream* st) {
1174 if (_num_jvm_args > 0) {
1175 for (int i=0; i < _num_jvm_args; i++) {
1176 st->print("%s ", _jvm_args_array[i]);
1177 }
1178 }
1179 }
1180
process_argument(const char * arg,jboolean ignore_unrecognized,JVMFlagOrigin origin)1181 bool Arguments::process_argument(const char* arg,
1182 jboolean ignore_unrecognized,
1183 JVMFlagOrigin origin) {
1184 JDK_Version since = JDK_Version();
1185
1186 if (parse_argument(arg, origin)) {
1187 return true;
1188 }
1189
1190 // Determine if the flag has '+', '-', or '=' characters.
1191 bool has_plus_minus = (*arg == '+' || *arg == '-');
1192 const char* const argname = has_plus_minus ? arg + 1 : arg;
1193
1194 size_t arg_len;
1195 const char* equal_sign = strchr(argname, '=');
1196 if (equal_sign == NULL) {
1197 arg_len = strlen(argname);
1198 } else {
1199 arg_len = equal_sign - argname;
1200 }
1201
1202 // Only make the obsolete check for valid arguments.
1203 if (arg_len <= BUFLEN) {
1204 // Construct a string which consists only of the argument name without '+', '-', or '='.
1205 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1206 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1207 if (is_obsolete_flag(stripped_argname, &since)) {
1208 char version[256];
1209 since.to_string(version, sizeof(version));
1210 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1211 return true;
1212 }
1213 }
1214
1215 // For locked flags, report a custom error message if available.
1216 // Otherwise, report the standard unrecognized VM option.
1217 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1218 if (found_flag != NULL) {
1219 char locked_message_buf[BUFLEN];
1220 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1221 if (strlen(locked_message_buf) == 0) {
1222 if (found_flag->is_bool() && !has_plus_minus) {
1223 jio_fprintf(defaultStream::error_stream(),
1224 "Missing +/- setting for VM option '%s'\n", argname);
1225 } else if (!found_flag->is_bool() && has_plus_minus) {
1226 jio_fprintf(defaultStream::error_stream(),
1227 "Unexpected +/- setting in VM option '%s'\n", argname);
1228 } else {
1229 jio_fprintf(defaultStream::error_stream(),
1230 "Improperly specified VM option '%s'\n", argname);
1231 }
1232 } else {
1233 #ifdef PRODUCT
1234 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1235 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1236 if (ignore_unrecognized && mismatched) {
1237 return true;
1238 }
1239 #endif
1240 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1241 }
1242 } else {
1243 if (ignore_unrecognized) {
1244 return true;
1245 }
1246 jio_fprintf(defaultStream::error_stream(),
1247 "Unrecognized VM option '%s'\n", argname);
1248 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1249 if (fuzzy_matched != NULL) {
1250 jio_fprintf(defaultStream::error_stream(),
1251 "Did you mean '%s%s%s'? ",
1252 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1253 fuzzy_matched->name(),
1254 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1255 }
1256 }
1257
1258 // allow for commandline "commenting out" options like -XX:#+Verbose
1259 return arg[0] == '#';
1260 }
1261
process_settings_file(const char * file_name,bool should_exist,jboolean ignore_unrecognized)1262 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1263 FILE* stream = fopen(file_name, "rb");
1264 if (stream == NULL) {
1265 if (should_exist) {
1266 jio_fprintf(defaultStream::error_stream(),
1267 "Could not open settings file %s\n", file_name);
1268 return false;
1269 } else {
1270 return true;
1271 }
1272 }
1273
1274 char token[1024];
1275 int pos = 0;
1276
1277 bool in_white_space = true;
1278 bool in_comment = false;
1279 bool in_quote = false;
1280 char quote_c = 0;
1281 bool result = true;
1282
1283 int c = getc(stream);
1284 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1285 if (in_white_space) {
1286 if (in_comment) {
1287 if (c == '\n') in_comment = false;
1288 } else {
1289 if (c == '#') in_comment = true;
1290 else if (!isspace(c)) {
1291 in_white_space = false;
1292 token[pos++] = c;
1293 }
1294 }
1295 } else {
1296 if (c == '\n' || (!in_quote && isspace(c))) {
1297 // token ends at newline, or at unquoted whitespace
1298 // this allows a way to include spaces in string-valued options
1299 token[pos] = '\0';
1300 logOption(token);
1301 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1302 build_jvm_flags(token);
1303 pos = 0;
1304 in_white_space = true;
1305 in_quote = false;
1306 } else if (!in_quote && (c == '\'' || c == '"')) {
1307 in_quote = true;
1308 quote_c = c;
1309 } else if (in_quote && (c == quote_c)) {
1310 in_quote = false;
1311 } else {
1312 token[pos++] = c;
1313 }
1314 }
1315 c = getc(stream);
1316 }
1317 if (pos > 0) {
1318 token[pos] = '\0';
1319 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1320 build_jvm_flags(token);
1321 }
1322 fclose(stream);
1323 return result;
1324 }
1325
1326 //=============================================================================================================
1327 // Parsing of properties (-D)
1328
get_property(const char * key)1329 const char* Arguments::get_property(const char* key) {
1330 return PropertyList_get_value(system_properties(), key);
1331 }
1332
add_property(const char * prop,PropertyWriteable writeable,PropertyInternal internal)1333 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1334 const char* eq = strchr(prop, '=');
1335 const char* key;
1336 const char* value = "";
1337
1338 if (eq == NULL) {
1339 // property doesn't have a value, thus use passed string
1340 key = prop;
1341 } else {
1342 // property have a value, thus extract it and save to the
1343 // allocated string
1344 size_t key_len = eq - prop;
1345 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1346
1347 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1348 key = tmp_key;
1349
1350 value = &prop[key_len + 1];
1351 }
1352
1353 #if INCLUDE_CDS
1354 if (is_internal_module_property(key) ||
1355 strcmp(key, "jdk.module.main") == 0) {
1356 MetaspaceShared::disable_optimized_module_handling();
1357 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1358 }
1359 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1360 strcmp(key, "jdk.module.illegalAccess") == 0 ||
1361 strcmp(key, "jdk.module.validation") == 0 ||
1362 strcmp(key, "java.system.class.loader") == 0) {
1363 MetaspaceShared::disable_full_module_graph();
1364 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1365 }
1366 #endif
1367
1368 if (strcmp(key, "java.compiler") == 0) {
1369 process_java_compiler_argument(value);
1370 // Record value in Arguments, but let it get passed to Java.
1371 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1372 // sun.java.launcher.is_altjvm property is
1373 // private and is processed in process_sun_java_launcher_properties();
1374 // the sun.java.launcher property is passed on to the java application
1375 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1376 // append is true, writable is true, internal is false
1377 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1378 WriteableProperty, ExternalProperty);
1379 } else {
1380 if (strcmp(key, "sun.java.command") == 0) {
1381 char *old_java_command = _java_command;
1382 _java_command = os::strdup_check_oom(value, mtArguments);
1383 if (old_java_command != NULL) {
1384 os::free(old_java_command);
1385 }
1386 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1387 // If this property is set on the command line then its value will be
1388 // displayed in VM error logs as the URL at which to submit such logs.
1389 // Normally the URL displayed in error logs is different from the value
1390 // of this system property, so a different property should have been
1391 // used here, but we leave this as-is in case someone depends upon it.
1392 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1393 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1394 // its value without going through the property list or making a Java call.
1395 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1396 if (old_java_vendor_url_bug != NULL) {
1397 os::free((void *)old_java_vendor_url_bug);
1398 }
1399 }
1400
1401 // Create new property and add at the end of the list
1402 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1403 }
1404
1405 if (key != prop) {
1406 // SystemProperty copy passed value, thus free previously allocated
1407 // memory
1408 FreeHeap((void *)key);
1409 }
1410
1411 return true;
1412 }
1413
1414 #if INCLUDE_CDS
1415 const char* unsupported_properties[] = { "jdk.module.limitmods",
1416 "jdk.module.upgrade.path",
1417 "jdk.module.patch.0" };
1418 const char* unsupported_options[] = { "--limit-modules",
1419 "--upgrade-module-path",
1420 "--patch-module"
1421 };
check_unsupported_dumping_properties()1422 void Arguments::check_unsupported_dumping_properties() {
1423 assert(is_dumping_archive(),
1424 "this function is only used with CDS dump time");
1425 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1426 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1427 SystemProperty* sp = system_properties();
1428 while (sp != NULL) {
1429 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1430 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1431 vm_exit_during_initialization(
1432 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1433 }
1434 }
1435 sp = sp->next();
1436 }
1437
1438 // Check for an exploded module build in use with -Xshare:dump.
1439 if (!has_jimage()) {
1440 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1441 }
1442 }
1443
check_unsupported_cds_runtime_properties()1444 bool Arguments::check_unsupported_cds_runtime_properties() {
1445 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1446 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1447 if (ArchiveClassesAtExit != NULL) {
1448 // dynamic dumping, just return false for now.
1449 // check_unsupported_dumping_properties() will be called later to check the same set of
1450 // properties, and will exit the VM with the correct error message if the unsupported properties
1451 // are used.
1452 return false;
1453 }
1454 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1455 if (get_property(unsupported_properties[i]) != NULL) {
1456 if (RequireSharedSpaces) {
1457 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1458 }
1459 return true;
1460 }
1461 }
1462 return false;
1463 }
1464 #endif
1465
1466 //===========================================================================================================
1467 // Setting int/mixed/comp mode flags
1468
set_mode_flags(Mode mode)1469 void Arguments::set_mode_flags(Mode mode) {
1470 // Set up default values for all flags.
1471 // If you add a flag to any of the branches below,
1472 // add a default value for it here.
1473 set_java_compiler(false);
1474 _mode = mode;
1475
1476 // Ensure Agent_OnLoad has the correct initial values.
1477 // This may not be the final mode; mode may change later in onload phase.
1478 PropertyList_unique_add(&_system_properties, "java.vm.info",
1479 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1480
1481 UseInterpreter = true;
1482 UseCompiler = true;
1483 UseLoopCounter = true;
1484
1485 // Default values may be platform/compiler dependent -
1486 // use the saved values
1487 ClipInlining = Arguments::_ClipInlining;
1488 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1489 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1490 BackgroundCompilation = Arguments::_BackgroundCompilation;
1491 if (TieredCompilation) {
1492 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1493 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1494 }
1495 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1496 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1497 }
1498 }
1499
1500 // Change from defaults based on mode
1501 switch (mode) {
1502 default:
1503 ShouldNotReachHere();
1504 break;
1505 case _int:
1506 UseCompiler = false;
1507 UseLoopCounter = false;
1508 AlwaysCompileLoopMethods = false;
1509 UseOnStackReplacement = false;
1510 break;
1511 case _mixed:
1512 // same as default
1513 break;
1514 case _comp:
1515 UseInterpreter = false;
1516 BackgroundCompilation = false;
1517 ClipInlining = false;
1518 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1519 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1520 // compile a level 4 (C2) and then continue executing it.
1521 if (TieredCompilation) {
1522 Tier3InvokeNotifyFreqLog = 0;
1523 Tier4InvocationThreshold = 0;
1524 }
1525 break;
1526 }
1527 }
1528
1529 // Conflict: required to use shared spaces (-Xshare:on), but
1530 // incompatible command line options were chosen.
no_shared_spaces(const char * message)1531 static void no_shared_spaces(const char* message) {
1532 if (RequireSharedSpaces) {
1533 jio_fprintf(defaultStream::error_stream(),
1534 "Class data sharing is inconsistent with other specified options.\n");
1535 vm_exit_during_initialization("Unable to use shared archive", message);
1536 } else {
1537 log_info(cds)("Unable to use shared archive: %s", message);
1538 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1539 }
1540 }
1541
set_object_alignment()1542 void set_object_alignment() {
1543 // Object alignment.
1544 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1545 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1546 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1547 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1548 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1549 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1550
1551 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1552 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1553
1554 // Oop encoding heap max
1555 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1556 }
1557
max_heap_for_compressed_oops()1558 size_t Arguments::max_heap_for_compressed_oops() {
1559 // Avoid sign flip.
1560 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1561 // We need to fit both the NULL page and the heap into the memory budget, while
1562 // keeping alignment constraints of the heap. To guarantee the latter, as the
1563 // NULL page is located before the heap, we pad the NULL page to the conservative
1564 // maximum alignment that the GC may ever impose upon the heap.
1565 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1566 _conservative_max_heap_alignment);
1567
1568 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1569 NOT_LP64(ShouldNotReachHere(); return 0);
1570 }
1571
set_use_compressed_oops()1572 void Arguments::set_use_compressed_oops() {
1573 #ifdef _LP64
1574 // MaxHeapSize is not set up properly at this point, but
1575 // the only value that can override MaxHeapSize if we are
1576 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1577 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1578
1579 if (max_heap_size <= max_heap_for_compressed_oops()) {
1580 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1581 FLAG_SET_ERGO(UseCompressedOops, true);
1582 }
1583 } else {
1584 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1585 warning("Max heap size too large for Compressed Oops");
1586 FLAG_SET_DEFAULT(UseCompressedOops, false);
1587 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1588 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1589 }
1590 }
1591 }
1592 #endif // _LP64
1593 }
1594
1595
1596 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1597 // set_use_compressed_oops().
set_use_compressed_klass_ptrs()1598 void Arguments::set_use_compressed_klass_ptrs() {
1599 #ifdef _LP64
1600 // On some architectures, the use of UseCompressedClassPointers implies the use of
1601 // UseCompressedOops. The reason is that the rheap_base register of said platforms
1602 // is reused to perform some optimized spilling, in order to use rheap_base as a
1603 // temp register. But by treating it as any other temp register, spilling can typically
1604 // be completely avoided instead. So it is better not to perform this trick. And by
1605 // not having that reliance, large heaps, or heaps not supporting compressed oops,
1606 // can still use compressed class pointers.
1607 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
1608 if (UseCompressedClassPointers) {
1609 warning("UseCompressedClassPointers requires UseCompressedOops");
1610 }
1611 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1612 } else {
1613 // Turn on UseCompressedClassPointers too
1614 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1615 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1616 }
1617 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1618 if (UseCompressedClassPointers) {
1619 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1620 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1621 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1622 }
1623 }
1624 }
1625 #endif // _LP64
1626 }
1627
set_conservative_max_heap_alignment()1628 void Arguments::set_conservative_max_heap_alignment() {
1629 // The conservative maximum required alignment for the heap is the maximum of
1630 // the alignments imposed by several sources: any requirements from the heap
1631 // itself and the maximum page size we may run the VM with.
1632 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1633 _conservative_max_heap_alignment = MAX4(heap_alignment,
1634 (size_t)os::vm_allocation_granularity(),
1635 os::max_page_size(),
1636 GCArguments::compute_heap_alignment());
1637 }
1638
set_ergonomics_flags()1639 jint Arguments::set_ergonomics_flags() {
1640 GCConfig::initialize();
1641
1642 set_conservative_max_heap_alignment();
1643
1644 #ifdef _LP64
1645 set_use_compressed_oops();
1646
1647 // set_use_compressed_klass_ptrs() must be called after calling
1648 // set_use_compressed_oops().
1649 set_use_compressed_klass_ptrs();
1650
1651 // Also checks that certain machines are slower with compressed oops
1652 // in vm_version initialization code.
1653 #endif // _LP64
1654
1655 return JNI_OK;
1656 }
1657
limit_heap_by_allocatable_memory(julong limit)1658 julong Arguments::limit_heap_by_allocatable_memory(julong limit) {
1659 julong max_allocatable;
1660 julong result = limit;
1661 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1662 // The AggressiveHeap check is a temporary workaround to avoid calling
1663 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1664 // selected. This works because AggressiveHeap implies UseParallelGC
1665 // where we know the ratio will be 1. Once the AggressiveHeap option is
1666 // removed, this can be cleaned up.
1667 julong heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1668 julong fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1669 result = MIN2(result, max_allocatable / fraction);
1670 }
1671 return result;
1672 }
1673
1674 // Use static initialization to get the default before parsing
1675 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1676
set_heap_size()1677 void Arguments::set_heap_size() {
1678 julong phys_mem;
1679
1680 // If the user specified one of these options, they
1681 // want specific memory sizing so do not limit memory
1682 // based on compressed oops addressability.
1683 // Also, memory limits will be calculated based on
1684 // available os physical memory, not our MaxRAM limit,
1685 // unless MaxRAM is also specified.
1686 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1687 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1688 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1689 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1690 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1691 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1692 !FLAG_IS_DEFAULT(MaxRAM));
1693 if (override_coop_limit) {
1694 if (FLAG_IS_DEFAULT(MaxRAM)) {
1695 phys_mem = os::physical_memory();
1696 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1697 } else {
1698 phys_mem = (julong)MaxRAM;
1699 }
1700 } else {
1701 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1702 : (julong)MaxRAM;
1703 }
1704
1705
1706 // Convert deprecated flags
1707 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1708 !FLAG_IS_DEFAULT(MaxRAMFraction))
1709 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1710
1711 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1712 !FLAG_IS_DEFAULT(MinRAMFraction))
1713 MinRAMPercentage = 100.0 / MinRAMFraction;
1714
1715 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1716 !FLAG_IS_DEFAULT(InitialRAMFraction))
1717 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1718
1719 // If the maximum heap size has not been set with -Xmx,
1720 // then set it as fraction of the size of physical memory,
1721 // respecting the maximum and minimum sizes of the heap.
1722 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1723 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1724 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1725 if (reasonable_min < MaxHeapSize) {
1726 // Small physical memory, so use a minimum fraction of it for the heap
1727 reasonable_max = reasonable_min;
1728 } else {
1729 // Not-small physical memory, so require a heap at least
1730 // as large as MaxHeapSize
1731 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1732 }
1733
1734 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1735 // Limit the heap size to ErgoHeapSizeLimit
1736 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1737 }
1738
1739 #ifdef _LP64
1740 if (UseCompressedOops || UseCompressedClassPointers) {
1741 // HeapBaseMinAddress can be greater than default but not less than.
1742 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1743 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1744 // matches compressed oops printing flags
1745 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1746 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1747 DefaultHeapBaseMinAddress,
1748 DefaultHeapBaseMinAddress/G,
1749 HeapBaseMinAddress);
1750 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1751 }
1752 }
1753 }
1754 if (UseCompressedOops) {
1755 // Limit the heap size to the maximum possible when using compressed oops
1756 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1757
1758 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1759 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1760 // but it should be not less than default MaxHeapSize.
1761 max_coop_heap -= HeapBaseMinAddress;
1762 }
1763
1764 // If user specified flags prioritizing os physical
1765 // memory limits, then disable compressed oops if
1766 // limits exceed max_coop_heap and UseCompressedOops
1767 // was not specified.
1768 if (reasonable_max > max_coop_heap) {
1769 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1770 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1771 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1772 "Please check the setting of MaxRAMPercentage %5.2f."
1773 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1774 FLAG_SET_ERGO(UseCompressedOops, false);
1775 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1776 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1777 }
1778 } else {
1779 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1780 }
1781 }
1782 }
1783 #endif // _LP64
1784
1785 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1786
1787 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1788 // An initial heap size was specified on the command line,
1789 // so be sure that the maximum size is consistent. Done
1790 // after call to limit_heap_by_allocatable_memory because that
1791 // method might reduce the allocation size.
1792 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1793 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1794 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1795 }
1796
1797 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1798 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1799 }
1800
1801 // If the minimum or initial heap_size have not been set or requested to be set
1802 // ergonomically, set them accordingly.
1803 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1804 julong reasonable_minimum = (julong)(OldSize + NewSize);
1805
1806 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1807
1808 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1809
1810 if (InitialHeapSize == 0) {
1811 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1812 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1813
1814 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1815 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1816
1817 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1818 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1819 }
1820 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1821 // synchronize with InitialHeapSize to avoid errors with the default value.
1822 if (MinHeapSize == 0) {
1823 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1824 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1825 }
1826 }
1827 }
1828
1829 // This option inspects the machine and attempts to set various
1830 // parameters to be optimal for long-running, memory allocation
1831 // intensive jobs. It is intended for machines with large
1832 // amounts of cpu and memory.
set_aggressive_heap_flags()1833 jint Arguments::set_aggressive_heap_flags() {
1834 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1835 // VM, but we may not be able to represent the total physical memory
1836 // available (like having 8gb of memory on a box but using a 32bit VM).
1837 // Thus, we need to make sure we're using a julong for intermediate
1838 // calculations.
1839 julong initHeapSize;
1840 julong total_memory = os::physical_memory();
1841
1842 if (total_memory < (julong) 256 * M) {
1843 jio_fprintf(defaultStream::error_stream(),
1844 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1845 vm_exit(1);
1846 }
1847
1848 // The heap size is half of available memory, or (at most)
1849 // all of possible memory less 160mb (leaving room for the OS
1850 // when using ISM). This is the maximum; because adaptive sizing
1851 // is turned on below, the actual space used may be smaller.
1852
1853 initHeapSize = MIN2(total_memory / (julong) 2,
1854 total_memory - (julong) 160 * M);
1855
1856 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1857
1858 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1859 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1860 return JNI_EINVAL;
1861 }
1862 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1863 return JNI_EINVAL;
1864 }
1865 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1866 return JNI_EINVAL;
1867 }
1868 }
1869 if (FLAG_IS_DEFAULT(NewSize)) {
1870 // Make the young generation 3/8ths of the total heap.
1871 if (FLAG_SET_CMDLINE(NewSize,
1872 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1873 return JNI_EINVAL;
1874 }
1875 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1876 return JNI_EINVAL;
1877 }
1878 }
1879
1880 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1881 FLAG_SET_DEFAULT(UseLargePages, true);
1882 #endif
1883
1884 // Increase some data structure sizes for efficiency
1885 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1886 return JNI_EINVAL;
1887 }
1888 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1889 return JNI_EINVAL;
1890 }
1891 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1892 return JNI_EINVAL;
1893 }
1894
1895 // See the OldPLABSize comment below, but replace 'after promotion'
1896 // with 'after copying'. YoungPLABSize is the size of the survivor
1897 // space per-gc-thread buffers. The default is 4kw.
1898 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1899 return JNI_EINVAL;
1900 }
1901
1902 // OldPLABSize is the size of the buffers in the old gen that
1903 // UseParallelGC uses to promote live data that doesn't fit in the
1904 // survivor spaces. At any given time, there's one for each gc thread.
1905 // The default size is 1kw. These buffers are rarely used, since the
1906 // survivor spaces are usually big enough. For specjbb, however, there
1907 // are occasions when there's lots of live data in the young gen
1908 // and we end up promoting some of it. We don't have a definite
1909 // explanation for why bumping OldPLABSize helps, but the theory
1910 // is that a bigger PLAB results in retaining something like the
1911 // original allocation order after promotion, which improves mutator
1912 // locality. A minor effect may be that larger PLABs reduce the
1913 // number of PLAB allocation events during gc. The value of 8kw
1914 // was arrived at by experimenting with specjbb.
1915 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1916 return JNI_EINVAL;
1917 }
1918
1919 // Enable parallel GC and adaptive generation sizing
1920 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1921 return JNI_EINVAL;
1922 }
1923
1924 // Encourage steady state memory management
1925 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1926 return JNI_EINVAL;
1927 }
1928
1929 // This appears to improve mutator locality
1930 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1931 return JNI_EINVAL;
1932 }
1933
1934 return JNI_OK;
1935 }
1936
1937 // This must be called after ergonomics.
set_bytecode_flags()1938 void Arguments::set_bytecode_flags() {
1939 if (!RewriteBytecodes) {
1940 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1941 }
1942 }
1943
1944 // Aggressive optimization flags
set_aggressive_opts_flags()1945 jint Arguments::set_aggressive_opts_flags() {
1946 #ifdef COMPILER2
1947 if (AggressiveUnboxing) {
1948 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1949 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1950 } else if (!EliminateAutoBox) {
1951 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1952 AggressiveUnboxing = false;
1953 }
1954 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1955 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1956 } else if (!DoEscapeAnalysis) {
1957 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1958 AggressiveUnboxing = false;
1959 }
1960 }
1961 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1962 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1963 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1964 }
1965 // Feed the cache size setting into the JDK
1966 char buffer[1024];
1967 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1968 if (!add_property(buffer)) {
1969 return JNI_ENOMEM;
1970 }
1971 }
1972 #endif
1973
1974 return JNI_OK;
1975 }
1976
1977 //===========================================================================================================
1978 // Parsing of java.compiler property
1979
process_java_compiler_argument(const char * arg)1980 void Arguments::process_java_compiler_argument(const char* arg) {
1981 // For backwards compatibility, Djava.compiler=NONE or ""
1982 // causes us to switch to -Xint mode UNLESS -Xdebug
1983 // is also specified.
1984 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1985 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1986 }
1987 }
1988
process_java_launcher_argument(const char * launcher,void * extra_info)1989 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1990 _sun_java_launcher = os::strdup_check_oom(launcher);
1991 }
1992
created_by_java_launcher()1993 bool Arguments::created_by_java_launcher() {
1994 assert(_sun_java_launcher != NULL, "property must have value");
1995 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1996 }
1997
sun_java_launcher_is_altjvm()1998 bool Arguments::sun_java_launcher_is_altjvm() {
1999 return _sun_java_launcher_is_altjvm;
2000 }
2001
2002 //===========================================================================================================
2003 // Parsing of main arguments
2004
2005 unsigned int addreads_count = 0;
2006 unsigned int addexports_count = 0;
2007 unsigned int addopens_count = 0;
2008 unsigned int addmods_count = 0;
2009 unsigned int patch_mod_count = 0;
2010
2011 // Check the consistency of vm_init_args
check_vm_args_consistency()2012 bool Arguments::check_vm_args_consistency() {
2013 // Method for adding checks for flag consistency.
2014 // The intent is to warn the user of all possible conflicts,
2015 // before returning an error.
2016 // Note: Needs platform-dependent factoring.
2017 bool status = true;
2018
2019 if (TLABRefillWasteFraction == 0) {
2020 jio_fprintf(defaultStream::error_stream(),
2021 "TLABRefillWasteFraction should be a denominator, "
2022 "not " SIZE_FORMAT "\n",
2023 TLABRefillWasteFraction);
2024 status = false;
2025 }
2026
2027 if (PrintNMTStatistics) {
2028 #if INCLUDE_NMT
2029 if (MemTracker::tracking_level() == NMT_off) {
2030 #endif // INCLUDE_NMT
2031 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2032 PrintNMTStatistics = false;
2033 #if INCLUDE_NMT
2034 }
2035 #endif
2036 }
2037
2038 status = CompilerConfig::check_args_consistency(status);
2039 #if INCLUDE_JVMCI
2040 if (status && EnableJVMCI) {
2041 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2042 AddProperty, UnwriteableProperty, InternalProperty);
2043 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2044 return false;
2045 }
2046 }
2047 #endif
2048
2049 #ifndef SUPPORT_RESERVED_STACK_AREA
2050 if (StackReservedPages != 0) {
2051 FLAG_SET_CMDLINE(StackReservedPages, 0);
2052 warning("Reserved Stack Area not supported on this platform");
2053 }
2054 #endif
2055
2056 return status;
2057 }
2058
is_bad_option(const JavaVMOption * option,jboolean ignore,const char * option_type)2059 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2060 const char* option_type) {
2061 if (ignore) return false;
2062
2063 const char* spacer = " ";
2064 if (option_type == NULL) {
2065 option_type = ++spacer; // Set both to the empty string.
2066 }
2067
2068 jio_fprintf(defaultStream::error_stream(),
2069 "Unrecognized %s%soption: %s\n", option_type, spacer,
2070 option->optionString);
2071 return true;
2072 }
2073
2074 static const char* user_assertion_options[] = {
2075 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2076 };
2077
2078 static const char* system_assertion_options[] = {
2079 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2080 };
2081
parse_uintx(const char * value,uintx * uintx_arg,uintx min_size)2082 bool Arguments::parse_uintx(const char* value,
2083 uintx* uintx_arg,
2084 uintx min_size) {
2085
2086 // Check the sign first since atojulong() parses only unsigned values.
2087 bool value_is_positive = !(*value == '-');
2088
2089 if (value_is_positive) {
2090 julong n;
2091 bool good_return = atojulong(value, &n);
2092 if (good_return) {
2093 bool above_minimum = n >= min_size;
2094 bool value_is_too_large = n > max_uintx;
2095
2096 if (above_minimum && !value_is_too_large) {
2097 *uintx_arg = n;
2098 return true;
2099 }
2100 }
2101 }
2102 return false;
2103 }
2104
create_module_property(const char * prop_name,const char * prop_value,PropertyInternal internal)2105 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2106 assert(is_internal_module_property(prop_name) ||
2107 strcmp(prop_name, "jdk.module.illegalAccess") == 0, "unknown module property: '%s'", prop_name);
2108 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2109 char* property = AllocateHeap(prop_len, mtArguments);
2110 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2111 if (ret < 0 || ret >= (int)prop_len) {
2112 FreeHeap(property);
2113 return false;
2114 }
2115 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2116 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2117 // that multiple occurrences of the associated flag just causes the existing property value to be
2118 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2119 // to a property after we have finished flag processing.
2120 bool added = add_property(property, WriteableProperty, internal);
2121 FreeHeap(property);
2122 return added;
2123 }
2124
create_numbered_module_property(const char * prop_base_name,const char * prop_value,unsigned int count)2125 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2126 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2127 const unsigned int props_count_limit = 1000;
2128 const int max_digits = 3;
2129 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2130
2131 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2132 if (count < props_count_limit) {
2133 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2134 char* property = AllocateHeap(prop_len, mtArguments);
2135 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2136 if (ret < 0 || ret >= (int)prop_len) {
2137 FreeHeap(property);
2138 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2139 return false;
2140 }
2141 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2142 FreeHeap(property);
2143 return added;
2144 }
2145
2146 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2147 return false;
2148 }
2149
parse_memory_size(const char * s,julong * long_arg,julong min_size,julong max_size)2150 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2151 julong* long_arg,
2152 julong min_size,
2153 julong max_size) {
2154 if (!atojulong(s, long_arg)) return arg_unreadable;
2155 return check_memory_size(*long_arg, min_size, max_size);
2156 }
2157
2158 // Parse JavaVMInitArgs structure
2159
parse_vm_init_args(const JavaVMInitArgs * vm_options_args,const JavaVMInitArgs * java_tool_options_args,const JavaVMInitArgs * java_options_args,const JavaVMInitArgs * cmd_line_args)2160 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2161 const JavaVMInitArgs *java_tool_options_args,
2162 const JavaVMInitArgs *java_options_args,
2163 const JavaVMInitArgs *cmd_line_args) {
2164 bool patch_mod_javabase = false;
2165
2166 // Save default settings for some mode flags
2167 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2168 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2169 Arguments::_ClipInlining = ClipInlining;
2170 Arguments::_BackgroundCompilation = BackgroundCompilation;
2171 if (TieredCompilation) {
2172 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2173 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2174 }
2175
2176 // Remember the default value of SharedBaseAddress.
2177 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2178
2179 // Setup flags for mixed which is the default
2180 set_mode_flags(_mixed);
2181
2182 // Parse args structure generated from java.base vm options resource
2183 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2184 if (result != JNI_OK) {
2185 return result;
2186 }
2187
2188 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2189 // variable (if present).
2190 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2191 if (result != JNI_OK) {
2192 return result;
2193 }
2194
2195 // Parse args structure generated from the command line flags.
2196 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2197 if (result != JNI_OK) {
2198 return result;
2199 }
2200
2201 // Parse args structure generated from the _JAVA_OPTIONS environment
2202 // variable (if present) (mimics classic VM)
2203 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2204 if (result != JNI_OK) {
2205 return result;
2206 }
2207
2208 // We need to ensure processor and memory resources have been properly
2209 // configured - which may rely on arguments we just processed - before
2210 // doing the final argument processing. Any argument processing that
2211 // needs to know about processor and memory resources must occur after
2212 // this point.
2213
2214 os::init_container_support();
2215
2216 // Do final processing now that all arguments have been parsed
2217 result = finalize_vm_init_args(patch_mod_javabase);
2218 if (result != JNI_OK) {
2219 return result;
2220 }
2221
2222 return JNI_OK;
2223 }
2224
2225 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2226 // represents a valid JDWP agent. is_path==true denotes that we
2227 // are dealing with -agentpath (case where name is a path), otherwise with
2228 // -agentlib
valid_jdwp_agent(char * name,bool is_path)2229 bool valid_jdwp_agent(char *name, bool is_path) {
2230 char *_name;
2231 const char *_jdwp = "jdwp";
2232 size_t _len_jdwp, _len_prefix;
2233
2234 if (is_path) {
2235 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2236 return false;
2237 }
2238
2239 _name++; // skip past last path separator
2240 _len_prefix = strlen(JNI_LIB_PREFIX);
2241
2242 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2243 return false;
2244 }
2245
2246 _name += _len_prefix;
2247 _len_jdwp = strlen(_jdwp);
2248
2249 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2250 _name += _len_jdwp;
2251 }
2252 else {
2253 return false;
2254 }
2255
2256 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2257 return false;
2258 }
2259
2260 return true;
2261 }
2262
2263 if (strcmp(name, _jdwp) == 0) {
2264 return true;
2265 }
2266
2267 return false;
2268 }
2269
process_patch_mod_option(const char * patch_mod_tail,bool * patch_mod_javabase)2270 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2271 // --patch-module=<module>=<file>(<pathsep><file>)*
2272 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2273 // Find the equal sign between the module name and the path specification
2274 const char* module_equal = strchr(patch_mod_tail, '=');
2275 if (module_equal == NULL) {
2276 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2277 return JNI_ERR;
2278 } else {
2279 // Pick out the module name
2280 size_t module_len = module_equal - patch_mod_tail;
2281 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2282 if (module_name != NULL) {
2283 memcpy(module_name, patch_mod_tail, module_len);
2284 *(module_name + module_len) = '\0';
2285 // The path piece begins one past the module_equal sign
2286 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2287 FREE_C_HEAP_ARRAY(char, module_name);
2288 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2289 return JNI_ENOMEM;
2290 }
2291 } else {
2292 return JNI_ENOMEM;
2293 }
2294 }
2295 return JNI_OK;
2296 }
2297
2298 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
parse_xss(const JavaVMOption * option,const char * tail,intx * out_ThreadStackSize)2299 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2300 // The min and max sizes match the values in globals.hpp, but scaled
2301 // with K. The values have been chosen so that alignment with page
2302 // size doesn't change the max value, which makes the conversions
2303 // back and forth between Xss value and ThreadStackSize value easier.
2304 // The values have also been chosen to fit inside a 32-bit signed type.
2305 const julong min_ThreadStackSize = 0;
2306 const julong max_ThreadStackSize = 1 * M;
2307
2308 const julong min_size = min_ThreadStackSize * K;
2309 const julong max_size = max_ThreadStackSize * K;
2310
2311 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2312
2313 julong size = 0;
2314 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2315 if (errcode != arg_in_range) {
2316 bool silent = (option == NULL); // Allow testing to silence error messages
2317 if (!silent) {
2318 jio_fprintf(defaultStream::error_stream(),
2319 "Invalid thread stack size: %s\n", option->optionString);
2320 describe_range_error(errcode);
2321 }
2322 return JNI_EINVAL;
2323 }
2324
2325 // Internally track ThreadStackSize in units of 1024 bytes.
2326 const julong size_aligned = align_up(size, K);
2327 assert(size <= size_aligned,
2328 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2329 size, size_aligned);
2330
2331 const julong size_in_K = size_aligned / K;
2332 assert(size_in_K < (julong)max_intx,
2333 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2334 size_in_K);
2335
2336 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2337 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2338 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2339 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2340 max_expanded, size_in_K);
2341
2342 *out_ThreadStackSize = (intx)size_in_K;
2343
2344 return JNI_OK;
2345 }
2346
parse_each_vm_init_arg(const JavaVMInitArgs * args,bool * patch_mod_javabase,JVMFlagOrigin origin)2347 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2348 // For match_option to return remaining or value part of option string
2349 const char* tail;
2350
2351 // iterate over arguments
2352 for (int index = 0; index < args->nOptions; index++) {
2353 bool is_absolute_path = false; // for -agentpath vs -agentlib
2354
2355 const JavaVMOption* option = args->options + index;
2356
2357 if (!match_option(option, "-Djava.class.path", &tail) &&
2358 !match_option(option, "-Dsun.java.command", &tail) &&
2359 !match_option(option, "-Dsun.java.launcher", &tail)) {
2360
2361 // add all jvm options to the jvm_args string. This string
2362 // is used later to set the java.vm.args PerfData string constant.
2363 // the -Djava.class.path and the -Dsun.java.command options are
2364 // omitted from jvm_args string as each have their own PerfData
2365 // string constant object.
2366 build_jvm_args(option->optionString);
2367 }
2368
2369 // -verbose:[class/module/gc/jni]
2370 if (match_option(option, "-verbose", &tail)) {
2371 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2372 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2373 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2374 } else if (!strcmp(tail, ":module")) {
2375 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2376 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2377 } else if (!strcmp(tail, ":gc")) {
2378 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2379 } else if (!strcmp(tail, ":jni")) {
2380 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2381 }
2382 // -da / -ea / -disableassertions / -enableassertions
2383 // These accept an optional class/package name separated by a colon, e.g.,
2384 // -da:java.lang.Thread.
2385 } else if (match_option(option, user_assertion_options, &tail, true)) {
2386 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2387 if (*tail == '\0') {
2388 JavaAssertions::setUserClassDefault(enable);
2389 } else {
2390 assert(*tail == ':', "bogus match by match_option()");
2391 JavaAssertions::addOption(tail + 1, enable);
2392 }
2393 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2394 } else if (match_option(option, system_assertion_options, &tail, false)) {
2395 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2396 JavaAssertions::setSystemClassDefault(enable);
2397 // -bootclasspath:
2398 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2399 jio_fprintf(defaultStream::output_stream(),
2400 "-Xbootclasspath is no longer a supported option.\n");
2401 return JNI_EINVAL;
2402 // -bootclasspath/a:
2403 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2404 Arguments::append_sysclasspath(tail);
2405 #if INCLUDE_CDS
2406 MetaspaceShared::disable_optimized_module_handling();
2407 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2408 #endif
2409 // -bootclasspath/p:
2410 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2411 jio_fprintf(defaultStream::output_stream(),
2412 "-Xbootclasspath/p is no longer a supported option.\n");
2413 return JNI_EINVAL;
2414 // -Xrun
2415 } else if (match_option(option, "-Xrun", &tail)) {
2416 if (tail != NULL) {
2417 const char* pos = strchr(tail, ':');
2418 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2419 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2420 jio_snprintf(name, len + 1, "%s", tail);
2421
2422 char *options = NULL;
2423 if(pos != NULL) {
2424 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2425 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2426 }
2427 #if !INCLUDE_JVMTI
2428 if (strcmp(name, "jdwp") == 0) {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Debugging agents are not supported in this VM\n");
2431 return JNI_ERR;
2432 }
2433 #endif // !INCLUDE_JVMTI
2434 add_init_library(name, options);
2435 }
2436 } else if (match_option(option, "--add-reads=", &tail)) {
2437 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2438 return JNI_ENOMEM;
2439 }
2440 } else if (match_option(option, "--add-exports=", &tail)) {
2441 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2442 return JNI_ENOMEM;
2443 }
2444 } else if (match_option(option, "--add-opens=", &tail)) {
2445 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2446 return JNI_ENOMEM;
2447 }
2448 } else if (match_option(option, "--add-modules=", &tail)) {
2449 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2450 return JNI_ENOMEM;
2451 }
2452 } else if (match_option(option, "--limit-modules=", &tail)) {
2453 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2454 return JNI_ENOMEM;
2455 }
2456 } else if (match_option(option, "--module-path=", &tail)) {
2457 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2458 return JNI_ENOMEM;
2459 }
2460 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2461 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2462 return JNI_ENOMEM;
2463 }
2464 } else if (match_option(option, "--patch-module=", &tail)) {
2465 // --patch-module=<module>=<file>(<pathsep><file>)*
2466 int res = process_patch_mod_option(tail, patch_mod_javabase);
2467 if (res != JNI_OK) {
2468 return res;
2469 }
2470 } else if (match_option(option, "--illegal-access=", &tail)) {
2471 warning("Option --illegal-access is deprecated and will be removed in a future release.");
2472 if (!create_module_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2473 return JNI_ENOMEM;
2474 }
2475 // -agentlib and -agentpath
2476 } else if (match_option(option, "-agentlib:", &tail) ||
2477 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2478 if(tail != NULL) {
2479 const char* pos = strchr(tail, '=');
2480 char* name;
2481 if (pos == NULL) {
2482 name = os::strdup_check_oom(tail, mtArguments);
2483 } else {
2484 size_t len = pos - tail;
2485 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2486 memcpy(name, tail, len);
2487 name[len] = '\0';
2488 }
2489
2490 char *options = NULL;
2491 if(pos != NULL) {
2492 options = os::strdup_check_oom(pos + 1, mtArguments);
2493 }
2494 #if !INCLUDE_JVMTI
2495 if (valid_jdwp_agent(name, is_absolute_path)) {
2496 jio_fprintf(defaultStream::error_stream(),
2497 "Debugging agents are not supported in this VM\n");
2498 return JNI_ERR;
2499 }
2500 #endif // !INCLUDE_JVMTI
2501 add_init_agent(name, options, is_absolute_path);
2502 }
2503 // -javaagent
2504 } else if (match_option(option, "-javaagent:", &tail)) {
2505 #if !INCLUDE_JVMTI
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Instrumentation agents are not supported in this VM\n");
2508 return JNI_ERR;
2509 #else
2510 if (tail != NULL) {
2511 size_t length = strlen(tail) + 1;
2512 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2513 jio_snprintf(options, length, "%s", tail);
2514 add_instrument_agent("instrument", options, false);
2515 // java agents need module java.instrument
2516 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2517 return JNI_ENOMEM;
2518 }
2519 }
2520 #endif // !INCLUDE_JVMTI
2521 // --enable_preview
2522 } else if (match_option(option, "--enable-preview")) {
2523 set_enable_preview();
2524 // -Xnoclassgc
2525 } else if (match_option(option, "-Xnoclassgc")) {
2526 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2527 return JNI_EINVAL;
2528 }
2529 // -Xbatch
2530 } else if (match_option(option, "-Xbatch")) {
2531 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2532 return JNI_EINVAL;
2533 }
2534 // -Xmn for compatibility with other JVM vendors
2535 } else if (match_option(option, "-Xmn", &tail)) {
2536 julong long_initial_young_size = 0;
2537 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2538 if (errcode != arg_in_range) {
2539 jio_fprintf(defaultStream::error_stream(),
2540 "Invalid initial young generation size: %s\n", option->optionString);
2541 describe_range_error(errcode);
2542 return JNI_EINVAL;
2543 }
2544 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2545 return JNI_EINVAL;
2546 }
2547 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2548 return JNI_EINVAL;
2549 }
2550 // -Xms
2551 } else if (match_option(option, "-Xms", &tail)) {
2552 julong size = 0;
2553 // an initial heap size of 0 means automatically determine
2554 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2555 if (errcode != arg_in_range) {
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Invalid initial heap size: %s\n", option->optionString);
2558 describe_range_error(errcode);
2559 return JNI_EINVAL;
2560 }
2561 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2562 return JNI_EINVAL;
2563 }
2564 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2565 return JNI_EINVAL;
2566 }
2567 // -Xmx
2568 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2569 julong long_max_heap_size = 0;
2570 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2571 if (errcode != arg_in_range) {
2572 jio_fprintf(defaultStream::error_stream(),
2573 "Invalid maximum heap size: %s\n", option->optionString);
2574 describe_range_error(errcode);
2575 return JNI_EINVAL;
2576 }
2577 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2578 return JNI_EINVAL;
2579 }
2580 // Xmaxf
2581 } else if (match_option(option, "-Xmaxf", &tail)) {
2582 char* err;
2583 int maxf = (int)(strtod(tail, &err) * 100);
2584 if (*err != '\0' || *tail == '\0') {
2585 jio_fprintf(defaultStream::error_stream(),
2586 "Bad max heap free percentage size: %s\n",
2587 option->optionString);
2588 return JNI_EINVAL;
2589 } else {
2590 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2591 return JNI_EINVAL;
2592 }
2593 }
2594 // Xminf
2595 } else if (match_option(option, "-Xminf", &tail)) {
2596 char* err;
2597 int minf = (int)(strtod(tail, &err) * 100);
2598 if (*err != '\0' || *tail == '\0') {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Bad min heap free percentage size: %s\n",
2601 option->optionString);
2602 return JNI_EINVAL;
2603 } else {
2604 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2605 return JNI_EINVAL;
2606 }
2607 }
2608 // -Xss
2609 } else if (match_option(option, "-Xss", &tail)) {
2610 intx value = 0;
2611 jint err = parse_xss(option, tail, &value);
2612 if (err != JNI_OK) {
2613 return err;
2614 }
2615 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2616 return JNI_EINVAL;
2617 }
2618 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2619 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2620 julong long_ReservedCodeCacheSize = 0;
2621
2622 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2623 if (errcode != arg_in_range) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Invalid maximum code cache size: %s.\n", option->optionString);
2626 return JNI_EINVAL;
2627 }
2628 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 // -green
2632 } else if (match_option(option, "-green")) {
2633 jio_fprintf(defaultStream::error_stream(),
2634 "Green threads support not available\n");
2635 return JNI_EINVAL;
2636 // -native
2637 } else if (match_option(option, "-native")) {
2638 // HotSpot always uses native threads, ignore silently for compatibility
2639 // -Xrs
2640 } else if (match_option(option, "-Xrs")) {
2641 // Classic/EVM option, new functionality
2642 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 // -Xprof
2646 } else if (match_option(option, "-Xprof")) {
2647 char version[256];
2648 // Obsolete in JDK 10
2649 JDK_Version::jdk(10).to_string(version, sizeof(version));
2650 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2651 // -Xinternalversion
2652 } else if (match_option(option, "-Xinternalversion")) {
2653 jio_fprintf(defaultStream::output_stream(), "%s\n",
2654 VM_Version::internal_vm_info_string());
2655 vm_exit(0);
2656 #ifndef PRODUCT
2657 // -Xprintflags
2658 } else if (match_option(option, "-Xprintflags")) {
2659 JVMFlag::printFlags(tty, false);
2660 vm_exit(0);
2661 #endif
2662 // -D
2663 } else if (match_option(option, "-D", &tail)) {
2664 const char* value;
2665 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2666 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2667 // abort if -Djava.endorsed.dirs is set
2668 jio_fprintf(defaultStream::output_stream(),
2669 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2670 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2671 return JNI_EINVAL;
2672 }
2673 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2674 *value != '\0' && strcmp(value, "\"\"") != 0) {
2675 // abort if -Djava.ext.dirs is set
2676 jio_fprintf(defaultStream::output_stream(),
2677 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2678 return JNI_EINVAL;
2679 }
2680 // Check for module related properties. They must be set using the modules
2681 // options. For example: use "--add-modules=java.sql", not
2682 // "-Djdk.module.addmods=java.sql"
2683 if (is_internal_module_property(option->optionString + 2)) {
2684 needs_module_property_warning = true;
2685 continue;
2686 }
2687 if (!add_property(tail)) {
2688 return JNI_ENOMEM;
2689 }
2690 // Out of the box management support
2691 if (match_option(option, "-Dcom.sun.management", &tail)) {
2692 #if INCLUDE_MANAGEMENT
2693 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2694 return JNI_EINVAL;
2695 }
2696 // management agent in module jdk.management.agent
2697 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2698 return JNI_ENOMEM;
2699 }
2700 #else
2701 jio_fprintf(defaultStream::output_stream(),
2702 "-Dcom.sun.management is not supported in this VM.\n");
2703 return JNI_ERR;
2704 #endif
2705 }
2706 // -Xint
2707 } else if (match_option(option, "-Xint")) {
2708 set_mode_flags(_int);
2709 // -Xmixed
2710 } else if (match_option(option, "-Xmixed")) {
2711 set_mode_flags(_mixed);
2712 // -Xcomp
2713 } else if (match_option(option, "-Xcomp")) {
2714 // for testing the compiler; turn off all flags that inhibit compilation
2715 set_mode_flags(_comp);
2716 // -Xshare:dump
2717 } else if (match_option(option, "-Xshare:dump")) {
2718 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2719 return JNI_EINVAL;
2720 }
2721 // -Xshare:on
2722 } else if (match_option(option, "-Xshare:on")) {
2723 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2730 } else if (match_option(option, "-Xshare:auto")) {
2731 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 // -Xshare:off
2738 } else if (match_option(option, "-Xshare:off")) {
2739 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2743 return JNI_EINVAL;
2744 }
2745 // -Xverify
2746 } else if (match_option(option, "-Xverify", &tail)) {
2747 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2748 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 } else if (strcmp(tail, ":remote") == 0) {
2755 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 } else if (strcmp(tail, ":none") == 0) {
2762 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2766 return JNI_EINVAL;
2767 }
2768 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2769 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2770 return JNI_EINVAL;
2771 }
2772 // -Xdebug
2773 } else if (match_option(option, "-Xdebug")) {
2774 // note this flag has been used, then ignore
2775 set_xdebug_mode(true);
2776 // -Xnoagent
2777 } else if (match_option(option, "-Xnoagent")) {
2778 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2779 } else if (match_option(option, "-Xloggc:", &tail)) {
2780 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2781 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2782 _gc_log_filename = os::strdup_check_oom(tail);
2783 } else if (match_option(option, "-Xlog", &tail)) {
2784 bool ret = false;
2785 if (strcmp(tail, ":help") == 0) {
2786 fileStream stream(defaultStream::output_stream());
2787 LogConfiguration::print_command_line_help(&stream);
2788 vm_exit(0);
2789 } else if (strcmp(tail, ":disable") == 0) {
2790 LogConfiguration::disable_logging();
2791 ret = true;
2792 } else if (*tail == '\0') {
2793 ret = LogConfiguration::parse_command_line_arguments();
2794 assert(ret, "-Xlog without arguments should never fail to parse");
2795 } else if (*tail == ':') {
2796 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2797 }
2798 if (ret == false) {
2799 jio_fprintf(defaultStream::error_stream(),
2800 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2801 tail);
2802 return JNI_EINVAL;
2803 }
2804 // JNI hooks
2805 } else if (match_option(option, "-Xcheck", &tail)) {
2806 if (!strcmp(tail, ":jni")) {
2807 #if !INCLUDE_JNI_CHECK
2808 warning("JNI CHECKING is not supported in this VM");
2809 #else
2810 CheckJNICalls = true;
2811 #endif // INCLUDE_JNI_CHECK
2812 } else if (is_bad_option(option, args->ignoreUnrecognized,
2813 "check")) {
2814 return JNI_EINVAL;
2815 }
2816 } else if (match_option(option, "vfprintf")) {
2817 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2818 } else if (match_option(option, "exit")) {
2819 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2820 } else if (match_option(option, "abort")) {
2821 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2822 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2823 // and the last option wins.
2824 } else if (match_option(option, "-XX:+NeverTenure")) {
2825 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2835 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2836 return JNI_EINVAL;
2837 }
2838 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2842 return JNI_EINVAL;
2843 }
2844 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2845 uintx max_tenuring_thresh = 0;
2846 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2847 jio_fprintf(defaultStream::error_stream(),
2848 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2849 return JNI_EINVAL;
2850 }
2851
2852 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855
2856 if (MaxTenuringThreshold == 0) {
2857 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2858 return JNI_EINVAL;
2859 }
2860 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 } else {
2864 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2865 return JNI_EINVAL;
2866 }
2867 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 }
2871 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2872 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2879 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2886 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2887 return JNI_EINVAL;
2888 }
2889 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2893 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2900 #if defined(DTRACE_ENABLED)
2901 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2902 return JNI_EINVAL;
2903 }
2904 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 #else // defined(DTRACE_ENABLED)
2914 jio_fprintf(defaultStream::error_stream(),
2915 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2916 return JNI_EINVAL;
2917 #endif // defined(DTRACE_ENABLED)
2918 #ifdef ASSERT
2919 } else if (match_option(option, "-XX:+FullGCALot")) {
2920 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2921 return JNI_EINVAL;
2922 }
2923 // disable scavenge before parallel mark-compact
2924 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 #endif
2928 #if !INCLUDE_MANAGEMENT
2929 } else if (match_option(option, "-XX:+ManagementServer")) {
2930 jio_fprintf(defaultStream::error_stream(),
2931 "ManagementServer is not supported in this VM.\n");
2932 return JNI_ERR;
2933 #endif // INCLUDE_MANAGEMENT
2934 #if INCLUDE_JVMCI
2935 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2936 if (EnableJVMCIProduct) {
2937 jio_fprintf(defaultStream::error_stream(),
2938 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2939 return JNI_EINVAL;
2940 }
2941 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2942 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
2943 if (EnableJVMCIProduct) {
2944 continue;
2945 }
2946 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2947 // Allow this flag if it has been unlocked.
2948 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2949 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2950 jio_fprintf(defaultStream::error_stream(),
2951 "Unable to enable JVMCI in product mode");
2952 return JNI_ERR;
2953 }
2954 }
2955 // The flag was locked so process normally to report that error
2956 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2957 return JNI_EINVAL;
2958 }
2959 #endif // INCLUDE_JVMCI
2960 #if INCLUDE_JFR
2961 } else if (match_jfr_option(&option)) {
2962 return JNI_EINVAL;
2963 #endif
2964 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2965 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2966 // already been handled
2967 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2968 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2969 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2970 return JNI_EINVAL;
2971 }
2972 }
2973 // Unknown option
2974 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2975 return JNI_ERR;
2976 }
2977 }
2978
2979 // PrintSharedArchiveAndExit will turn on
2980 // -Xshare:on
2981 // -Xlog:class+path=info
2982 if (PrintSharedArchiveAndExit) {
2983 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2987 return JNI_EINVAL;
2988 }
2989 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2990 }
2991
2992 fix_appclasspath();
2993
2994 return JNI_OK;
2995 }
2996
add_patch_mod_prefix(const char * module_name,const char * path,bool * patch_mod_javabase)2997 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2998 // For java.base check for duplicate --patch-module options being specified on the command line.
2999 // This check is only required for java.base, all other duplicate module specifications
3000 // will be checked during module system initialization. The module system initialization
3001 // will throw an ExceptionInInitializerError if this situation occurs.
3002 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3003 if (*patch_mod_javabase) {
3004 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3005 } else {
3006 *patch_mod_javabase = true;
3007 }
3008 }
3009
3010 // Create GrowableArray lazily, only if --patch-module has been specified
3011 if (_patch_mod_prefix == NULL) {
3012 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
3013 }
3014
3015 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3016 }
3017
3018 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3019 //
3020 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3021 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3022 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3023 // path is treated as the current directory.
3024 //
3025 // This causes problems with CDS, which requires that all directories specified in the classpath
3026 // must be empty. In most cases, applications do NOT want to load classes from the current
3027 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3028 // scripts compatible with CDS.
fix_appclasspath()3029 void Arguments::fix_appclasspath() {
3030 if (IgnoreEmptyClassPaths) {
3031 const char separator = *os::path_separator();
3032 const char* src = _java_class_path->value();
3033
3034 // skip over all the leading empty paths
3035 while (*src == separator) {
3036 src ++;
3037 }
3038
3039 char* copy = os::strdup_check_oom(src, mtArguments);
3040
3041 // trim all trailing empty paths
3042 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3043 *tail = '\0';
3044 }
3045
3046 char from[3] = {separator, separator, '\0'};
3047 char to [2] = {separator, '\0'};
3048 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3049 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3050 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3051 }
3052
3053 _java_class_path->set_writeable_value(copy);
3054 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3055 }
3056 }
3057
finalize_vm_init_args(bool patch_mod_javabase)3058 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3059 // check if the default lib/endorsed directory exists; if so, error
3060 char path[JVM_MAXPATHLEN];
3061 const char* fileSep = os::file_separator();
3062 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3063
3064 DIR* dir = os::opendir(path);
3065 if (dir != NULL) {
3066 jio_fprintf(defaultStream::output_stream(),
3067 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3068 "in modular form will be supported via the concept of upgradeable modules.\n");
3069 os::closedir(dir);
3070 return JNI_ERR;
3071 }
3072
3073 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3074 dir = os::opendir(path);
3075 if (dir != NULL) {
3076 jio_fprintf(defaultStream::output_stream(),
3077 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3078 "Use -classpath instead.\n.");
3079 os::closedir(dir);
3080 return JNI_ERR;
3081 }
3082
3083 // This must be done after all arguments have been processed
3084 // and the container support has been initialized since AggressiveHeap
3085 // relies on the amount of total memory available.
3086 if (AggressiveHeap) {
3087 jint result = set_aggressive_heap_flags();
3088 if (result != JNI_OK) {
3089 return result;
3090 }
3091 }
3092
3093 // This must be done after all arguments have been processed.
3094 // java_compiler() true means set to "NONE" or empty.
3095 if (java_compiler() && !xdebug_mode()) {
3096 // For backwards compatibility, we switch to interpreted mode if
3097 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3098 // not specified.
3099 set_mode_flags(_int);
3100 }
3101
3102 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3103 // but like -Xint, leave compilation thresholds unaffected.
3104 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3105 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3106 set_mode_flags(_int);
3107 }
3108
3109 #ifdef ZERO
3110 // Zero always runs in interpreted mode
3111 set_mode_flags(_int);
3112 #endif
3113
3114 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3115 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3116 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3117 }
3118
3119 #if !COMPILER2_OR_JVMCI
3120 // Don't degrade server performance for footprint
3121 if (FLAG_IS_DEFAULT(UseLargePages) &&
3122 MaxHeapSize < LargePageHeapSizeThreshold) {
3123 // No need for large granularity pages w/small heaps.
3124 // Note that large pages are enabled/disabled for both the
3125 // Java heap and the code cache.
3126 FLAG_SET_DEFAULT(UseLargePages, false);
3127 }
3128
3129 UNSUPPORTED_OPTION(ProfileInterpreter);
3130 #endif
3131
3132
3133 #ifdef TIERED
3134 // Parse the CompilationMode flag
3135 if (!CompilationModeFlag::initialize()) {
3136 return JNI_ERR;
3137 }
3138 #else
3139 // Tiered compilation is undefined.
3140 UNSUPPORTED_OPTION(TieredCompilation);
3141 #endif
3142
3143 if (!check_vm_args_consistency()) {
3144 return JNI_ERR;
3145 }
3146
3147 #if INCLUDE_CDS
3148 if (DumpSharedSpaces) {
3149 // Disable biased locking now as it interferes with the clean up of
3150 // the archived Klasses and Java string objects (at dump time only).
3151 UseBiasedLocking = false;
3152
3153 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3154 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3155 // compiler just to be safe.
3156 //
3157 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3158 // instead of modifying them in place. The copy is inaccessible to the compiler.
3159 // TODO: revisit the following for the static archive case.
3160 set_mode_flags(_int);
3161 }
3162 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3163 // Always verify non-system classes during CDS dump
3164 if (!BytecodeVerificationRemote) {
3165 BytecodeVerificationRemote = true;
3166 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3167 }
3168 }
3169 if (ArchiveClassesAtExit == NULL) {
3170 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3171 }
3172 if (UseSharedSpaces && patch_mod_javabase) {
3173 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3174 }
3175 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3176 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3177 }
3178 #endif
3179
3180 #if !INCLUDE_AOT
3181 UNSUPPORTED_OPTION(UseAOT);
3182 UNSUPPORTED_OPTION(PrintAOT);
3183 UNSUPPORTED_OPTION(UseAOTStrictLoading);
3184 UNSUPPORTED_OPTION_NULL(AOTLibrary);
3185
3186 UNSUPPORTED_OPTION_INIT(Tier3AOTInvocationThreshold, 0);
3187 UNSUPPORTED_OPTION_INIT(Tier3AOTMinInvocationThreshold, 0);
3188 UNSUPPORTED_OPTION_INIT(Tier3AOTCompileThreshold, 0);
3189 UNSUPPORTED_OPTION_INIT(Tier3AOTBackEdgeThreshold, 0);
3190 UNSUPPORTED_OPTION_INIT(Tier0AOTInvocationThreshold, 0);
3191 UNSUPPORTED_OPTION_INIT(Tier0AOTMinInvocationThreshold, 0);
3192 UNSUPPORTED_OPTION_INIT(Tier0AOTCompileThreshold, 0);
3193 UNSUPPORTED_OPTION_INIT(Tier0AOTBackEdgeThreshold, 0);
3194 #ifndef PRODUCT
3195 UNSUPPORTED_OPTION(PrintAOTStatistics);
3196 #endif
3197 #endif
3198
3199 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3200 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3201 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3202
3203 return JNI_OK;
3204 }
3205
3206 // Helper class for controlling the lifetime of JavaVMInitArgs
3207 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3208 // deleted on the destruction of the ScopedVMInitArgs object.
3209 class ScopedVMInitArgs : public StackObj {
3210 private:
3211 JavaVMInitArgs _args;
3212 char* _container_name;
3213 bool _is_set;
3214 char* _vm_options_file_arg;
3215
3216 public:
ScopedVMInitArgs(const char * container_name)3217 ScopedVMInitArgs(const char *container_name) {
3218 _args.version = JNI_VERSION_1_2;
3219 _args.nOptions = 0;
3220 _args.options = NULL;
3221 _args.ignoreUnrecognized = false;
3222 _container_name = (char *)container_name;
3223 _is_set = false;
3224 _vm_options_file_arg = NULL;
3225 }
3226
3227 // Populates the JavaVMInitArgs object represented by this
3228 // ScopedVMInitArgs object with the arguments in options. The
3229 // allocated memory is deleted by the destructor. If this method
3230 // returns anything other than JNI_OK, then this object is in a
3231 // partially constructed state, and should be abandoned.
set_args(const GrowableArrayView<JavaVMOption> * options)3232 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3233 _is_set = true;
3234 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3235 JavaVMOption, options->length(), mtArguments);
3236 if (options_arr == NULL) {
3237 return JNI_ENOMEM;
3238 }
3239 _args.options = options_arr;
3240
3241 for (int i = 0; i < options->length(); i++) {
3242 options_arr[i] = options->at(i);
3243 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3244 if (options_arr[i].optionString == NULL) {
3245 // Rely on the destructor to do cleanup.
3246 _args.nOptions = i;
3247 return JNI_ENOMEM;
3248 }
3249 }
3250
3251 _args.nOptions = options->length();
3252 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3253 return JNI_OK;
3254 }
3255
get()3256 JavaVMInitArgs* get() { return &_args; }
container_name()3257 char* container_name() { return _container_name; }
is_set()3258 bool is_set() { return _is_set; }
found_vm_options_file_arg()3259 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
vm_options_file_arg()3260 char* vm_options_file_arg() { return _vm_options_file_arg; }
3261
set_vm_options_file_arg(const char * vm_options_file_arg)3262 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3263 if (_vm_options_file_arg != NULL) {
3264 os::free(_vm_options_file_arg);
3265 }
3266 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3267 }
3268
~ScopedVMInitArgs()3269 ~ScopedVMInitArgs() {
3270 if (_vm_options_file_arg != NULL) {
3271 os::free(_vm_options_file_arg);
3272 }
3273 if (_args.options == NULL) return;
3274 for (int i = 0; i < _args.nOptions; i++) {
3275 os::free(_args.options[i].optionString);
3276 }
3277 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3278 }
3279
3280 // Insert options into this option list, to replace option at
3281 // vm_options_file_pos (-XX:VMOptionsFile)
insert(const JavaVMInitArgs * args,const JavaVMInitArgs * args_to_insert,const int vm_options_file_pos)3282 jint insert(const JavaVMInitArgs* args,
3283 const JavaVMInitArgs* args_to_insert,
3284 const int vm_options_file_pos) {
3285 assert(_args.options == NULL, "shouldn't be set yet");
3286 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3287 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3288
3289 int length = args->nOptions + args_to_insert->nOptions - 1;
3290 // Construct new option array
3291 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3292 for (int i = 0; i < args->nOptions; i++) {
3293 if (i == vm_options_file_pos) {
3294 // insert the new options starting at the same place as the
3295 // -XX:VMOptionsFile option
3296 for (int j = 0; j < args_to_insert->nOptions; j++) {
3297 options.push(args_to_insert->options[j]);
3298 }
3299 } else {
3300 options.push(args->options[i]);
3301 }
3302 }
3303 // make into options array
3304 return set_args(&options);
3305 }
3306 };
3307
parse_java_options_environment_variable(ScopedVMInitArgs * args)3308 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3309 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3310 }
3311
parse_java_tool_options_environment_variable(ScopedVMInitArgs * args)3312 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3313 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3314 }
3315
parse_options_environment_variable(const char * name,ScopedVMInitArgs * vm_args)3316 jint Arguments::parse_options_environment_variable(const char* name,
3317 ScopedVMInitArgs* vm_args) {
3318 char *buffer = ::getenv(name);
3319
3320 // Don't check this environment variable if user has special privileges
3321 // (e.g. unix su command).
3322 if (buffer == NULL || os::have_special_privileges()) {
3323 return JNI_OK;
3324 }
3325
3326 if ((buffer = os::strdup(buffer)) == NULL) {
3327 return JNI_ENOMEM;
3328 }
3329
3330 jio_fprintf(defaultStream::error_stream(),
3331 "Picked up %s: %s\n", name, buffer);
3332
3333 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3334
3335 os::free(buffer);
3336 return retcode;
3337 }
3338
parse_vm_options_file(const char * file_name,ScopedVMInitArgs * vm_args)3339 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3340 // read file into buffer
3341 int fd = ::open(file_name, O_RDONLY);
3342 if (fd < 0) {
3343 jio_fprintf(defaultStream::error_stream(),
3344 "Could not open options file '%s'\n",
3345 file_name);
3346 return JNI_ERR;
3347 }
3348
3349 struct stat stbuf;
3350 int retcode = os::stat(file_name, &stbuf);
3351 if (retcode != 0) {
3352 jio_fprintf(defaultStream::error_stream(),
3353 "Could not stat options file '%s'\n",
3354 file_name);
3355 os::close(fd);
3356 return JNI_ERR;
3357 }
3358
3359 if (stbuf.st_size == 0) {
3360 // tell caller there is no option data and that is ok
3361 os::close(fd);
3362 return JNI_OK;
3363 }
3364
3365 // '+ 1' for NULL termination even with max bytes
3366 size_t bytes_alloc = stbuf.st_size + 1;
3367
3368 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3369 if (NULL == buf) {
3370 jio_fprintf(defaultStream::error_stream(),
3371 "Could not allocate read buffer for options file parse\n");
3372 os::close(fd);
3373 return JNI_ENOMEM;
3374 }
3375
3376 memset(buf, 0, bytes_alloc);
3377
3378 // Fill buffer
3379 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3380 os::close(fd);
3381 if (bytes_read < 0) {
3382 FREE_C_HEAP_ARRAY(char, buf);
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Could not read options file '%s'\n", file_name);
3385 return JNI_ERR;
3386 }
3387
3388 if (bytes_read == 0) {
3389 // tell caller there is no option data and that is ok
3390 FREE_C_HEAP_ARRAY(char, buf);
3391 return JNI_OK;
3392 }
3393
3394 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3395
3396 FREE_C_HEAP_ARRAY(char, buf);
3397 return retcode;
3398 }
3399
parse_options_buffer(const char * name,char * buffer,const size_t buf_len,ScopedVMInitArgs * vm_args)3400 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3401 // Construct option array
3402 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3403
3404 // some pointers to help with parsing
3405 char *buffer_end = buffer + buf_len;
3406 char *opt_hd = buffer;
3407 char *wrt = buffer;
3408 char *rd = buffer;
3409
3410 // parse all options
3411 while (rd < buffer_end) {
3412 // skip leading white space from the input string
3413 while (rd < buffer_end && isspace(*rd)) {
3414 rd++;
3415 }
3416
3417 if (rd >= buffer_end) {
3418 break;
3419 }
3420
3421 // Remember this is where we found the head of the token.
3422 opt_hd = wrt;
3423
3424 // Tokens are strings of non white space characters separated
3425 // by one or more white spaces.
3426 while (rd < buffer_end && !isspace(*rd)) {
3427 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3428 int quote = *rd; // matching quote to look for
3429 rd++; // don't copy open quote
3430 while (rd < buffer_end && *rd != quote) {
3431 // include everything (even spaces)
3432 // up until the close quote
3433 *wrt++ = *rd++; // copy to option string
3434 }
3435
3436 if (rd < buffer_end) {
3437 rd++; // don't copy close quote
3438 } else {
3439 // did not see closing quote
3440 jio_fprintf(defaultStream::error_stream(),
3441 "Unmatched quote in %s\n", name);
3442 return JNI_ERR;
3443 }
3444 } else {
3445 *wrt++ = *rd++; // copy to option string
3446 }
3447 }
3448
3449 // steal a white space character and set it to NULL
3450 *wrt++ = '\0';
3451 // We now have a complete token
3452
3453 JavaVMOption option;
3454 option.optionString = opt_hd;
3455 option.extraInfo = NULL;
3456
3457 options.append(option); // Fill in option
3458
3459 rd++; // Advance to next character
3460 }
3461
3462 // Fill out JavaVMInitArgs structure.
3463 return vm_args->set_args(&options);
3464 }
3465
set_shared_spaces_flags_and_archive_paths()3466 jint Arguments::set_shared_spaces_flags_and_archive_paths() {
3467 if (DumpSharedSpaces) {
3468 if (RequireSharedSpaces) {
3469 warning("Cannot dump shared archive while using shared archive");
3470 }
3471 UseSharedSpaces = false;
3472 }
3473 #if INCLUDE_CDS
3474 // Initialize shared archive paths which could include both base and dynamic archive paths
3475 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3476 if (!init_shared_archive_paths()) {
3477 return JNI_ENOMEM;
3478 }
3479 #endif // INCLUDE_CDS
3480 return JNI_OK;
3481 }
3482
3483 #if INCLUDE_CDS
3484 // Sharing support
3485 // Construct the path to the archive
get_default_shared_archive_path()3486 char* Arguments::get_default_shared_archive_path() {
3487 char *default_archive_path;
3488 char jvm_path[JVM_MAXPATHLEN];
3489 os::jvm_path(jvm_path, sizeof(jvm_path));
3490 char *end = strrchr(jvm_path, *os::file_separator());
3491 if (end != NULL) *end = '\0';
3492 size_t jvm_path_len = strlen(jvm_path);
3493 size_t file_sep_len = strlen(os::file_separator());
3494 const size_t len = jvm_path_len + file_sep_len + 20;
3495 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3496 jio_snprintf(default_archive_path, len,
3497 UseCompressedOops ? "%s%sclasses.jsa": "%s%sclasses_nocoops.jsa",
3498 jvm_path, os::file_separator());
3499 return default_archive_path;
3500 }
3501
num_archives(const char * archive_path)3502 int Arguments::num_archives(const char* archive_path) {
3503 if (archive_path == NULL) {
3504 return 0;
3505 }
3506 int npaths = 1;
3507 char* p = (char*)archive_path;
3508 while (*p != '\0') {
3509 if (*p == os::path_separator()[0]) {
3510 npaths++;
3511 }
3512 p++;
3513 }
3514 return npaths;
3515 }
3516
extract_shared_archive_paths(const char * archive_path,char ** base_archive_path,char ** top_archive_path)3517 void Arguments::extract_shared_archive_paths(const char* archive_path,
3518 char** base_archive_path,
3519 char** top_archive_path) {
3520 char* begin_ptr = (char*)archive_path;
3521 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3522 if (end_ptr == NULL || end_ptr == begin_ptr) {
3523 vm_exit_during_initialization("Base archive was not specified", archive_path);
3524 }
3525 size_t len = end_ptr - begin_ptr;
3526 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3527 strncpy(cur_path, begin_ptr, len);
3528 cur_path[len] = '\0';
3529 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3530 *base_archive_path = cur_path;
3531
3532 begin_ptr = ++end_ptr;
3533 if (*begin_ptr == '\0') {
3534 vm_exit_during_initialization("Top archive was not specified", archive_path);
3535 }
3536 end_ptr = strchr(begin_ptr, '\0');
3537 assert(end_ptr != NULL, "sanity");
3538 len = end_ptr - begin_ptr;
3539 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3540 strncpy(cur_path, begin_ptr, len + 1);
3541 //cur_path[len] = '\0';
3542 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3543 *top_archive_path = cur_path;
3544 }
3545
init_shared_archive_paths()3546 bool Arguments::init_shared_archive_paths() {
3547 if (ArchiveClassesAtExit != NULL) {
3548 if (DumpSharedSpaces) {
3549 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3550 }
3551 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3552 return false;
3553 }
3554 check_unsupported_dumping_properties();
3555 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3556 }
3557 if (SharedArchiveFile == NULL) {
3558 SharedArchivePath = get_default_shared_archive_path();
3559 } else {
3560 int archives = num_archives(SharedArchiveFile);
3561 if (is_dumping_archive()) {
3562 if (archives > 1) {
3563 vm_exit_during_initialization(
3564 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3565 }
3566 if (DynamicDumpSharedSpaces) {
3567 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3568 vm_exit_during_initialization(
3569 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3570 SharedArchiveFile);
3571 }
3572 }
3573 }
3574 if (!is_dumping_archive()){
3575 if (archives > 2) {
3576 vm_exit_during_initialization(
3577 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3578 }
3579 if (archives == 1) {
3580 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3581 int name_size;
3582 bool success =
3583 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3584 if (!success) {
3585 SharedArchivePath = temp_archive_path;
3586 } else {
3587 SharedDynamicArchivePath = temp_archive_path;
3588 }
3589 } else {
3590 extract_shared_archive_paths((const char*)SharedArchiveFile,
3591 &SharedArchivePath, &SharedDynamicArchivePath);
3592 }
3593 } else { // CDS dumping
3594 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3595 }
3596 }
3597 return (SharedArchivePath != NULL);
3598 }
3599 #endif // INCLUDE_CDS
3600
3601 #ifndef PRODUCT
3602 // Determine whether LogVMOutput should be implicitly turned on.
use_vm_log()3603 static bool use_vm_log() {
3604 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3605 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3606 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3607 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3608 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3609 return true;
3610 }
3611
3612 #ifdef COMPILER1
3613 if (PrintC1Statistics) {
3614 return true;
3615 }
3616 #endif // COMPILER1
3617
3618 #ifdef COMPILER2
3619 if (PrintOptoAssembly || PrintOptoStatistics) {
3620 return true;
3621 }
3622 #endif // COMPILER2
3623
3624 return false;
3625 }
3626
3627 #endif // PRODUCT
3628
args_contains_vm_options_file_arg(const JavaVMInitArgs * args)3629 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3630 for (int index = 0; index < args->nOptions; index++) {
3631 const JavaVMOption* option = args->options + index;
3632 const char* tail;
3633 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3634 return true;
3635 }
3636 }
3637 return false;
3638 }
3639
insert_vm_options_file(const JavaVMInitArgs * args,const char * vm_options_file,const int vm_options_file_pos,ScopedVMInitArgs * vm_options_file_args,ScopedVMInitArgs * args_out)3640 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3641 const char* vm_options_file,
3642 const int vm_options_file_pos,
3643 ScopedVMInitArgs* vm_options_file_args,
3644 ScopedVMInitArgs* args_out) {
3645 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3646 if (code != JNI_OK) {
3647 return code;
3648 }
3649
3650 if (vm_options_file_args->get()->nOptions < 1) {
3651 return JNI_OK;
3652 }
3653
3654 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3655 jio_fprintf(defaultStream::error_stream(),
3656 "A VM options file may not refer to a VM options file. "
3657 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3658 "options file '%s' in options container '%s' is an error.\n",
3659 vm_options_file_args->vm_options_file_arg(),
3660 vm_options_file_args->container_name());
3661 return JNI_EINVAL;
3662 }
3663
3664 return args_out->insert(args, vm_options_file_args->get(),
3665 vm_options_file_pos);
3666 }
3667
3668 // Expand -XX:VMOptionsFile found in args_in as needed.
3669 // mod_args and args_out parameters may return values as needed.
expand_vm_options_as_needed(const JavaVMInitArgs * args_in,ScopedVMInitArgs * mod_args,JavaVMInitArgs ** args_out)3670 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3671 ScopedVMInitArgs* mod_args,
3672 JavaVMInitArgs** args_out) {
3673 jint code = match_special_option_and_act(args_in, mod_args);
3674 if (code != JNI_OK) {
3675 return code;
3676 }
3677
3678 if (mod_args->is_set()) {
3679 // args_in contains -XX:VMOptionsFile and mod_args contains the
3680 // original options from args_in along with the options expanded
3681 // from the VMOptionsFile. Return a short-hand to the caller.
3682 *args_out = mod_args->get();
3683 } else {
3684 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3685 }
3686 return JNI_OK;
3687 }
3688
match_special_option_and_act(const JavaVMInitArgs * args,ScopedVMInitArgs * args_out)3689 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3690 ScopedVMInitArgs* args_out) {
3691 // Remaining part of option string
3692 const char* tail;
3693 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3694
3695 for (int index = 0; index < args->nOptions; index++) {
3696 const JavaVMOption* option = args->options + index;
3697 if (match_option(option, "-XX:Flags=", &tail)) {
3698 Arguments::set_jvm_flags_file(tail);
3699 continue;
3700 }
3701 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3702 if (vm_options_file_args.found_vm_options_file_arg()) {
3703 jio_fprintf(defaultStream::error_stream(),
3704 "The option '%s' is already specified in the options "
3705 "container '%s' so the specification of '%s' in the "
3706 "same options container is an error.\n",
3707 vm_options_file_args.vm_options_file_arg(),
3708 vm_options_file_args.container_name(),
3709 option->optionString);
3710 return JNI_EINVAL;
3711 }
3712 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3713 // If there's a VMOptionsFile, parse that
3714 jint code = insert_vm_options_file(args, tail, index,
3715 &vm_options_file_args, args_out);
3716 if (code != JNI_OK) {
3717 return code;
3718 }
3719 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3720 if (args_out->is_set()) {
3721 // The VMOptions file inserted some options so switch 'args'
3722 // to the new set of options, and continue processing which
3723 // preserves "last option wins" semantics.
3724 args = args_out->get();
3725 // The first option from the VMOptionsFile replaces the
3726 // current option. So we back track to process the
3727 // replacement option.
3728 index--;
3729 }
3730 continue;
3731 }
3732 if (match_option(option, "-XX:+PrintVMOptions")) {
3733 PrintVMOptions = true;
3734 continue;
3735 }
3736 if (match_option(option, "-XX:-PrintVMOptions")) {
3737 PrintVMOptions = false;
3738 continue;
3739 }
3740 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3741 IgnoreUnrecognizedVMOptions = true;
3742 continue;
3743 }
3744 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3745 IgnoreUnrecognizedVMOptions = false;
3746 continue;
3747 }
3748 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3749 JVMFlag::printFlags(tty, false);
3750 vm_exit(0);
3751 }
3752 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3753 #if INCLUDE_NMT
3754 // The launcher did not setup nmt environment variable properly.
3755 if (!MemTracker::check_launcher_nmt_support(tail)) {
3756 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3757 }
3758
3759 // Verify if nmt option is valid.
3760 if (MemTracker::verify_nmt_option()) {
3761 // Late initialization, still in single-threaded mode.
3762 if (MemTracker::tracking_level() >= NMT_summary) {
3763 MemTracker::init();
3764 }
3765 } else {
3766 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3767 }
3768 continue;
3769 #else
3770 jio_fprintf(defaultStream::error_stream(),
3771 "Native Memory Tracking is not supported in this VM\n");
3772 return JNI_ERR;
3773 #endif
3774 }
3775
3776 #ifndef PRODUCT
3777 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3778 JVMFlag::printFlags(tty, true);
3779 vm_exit(0);
3780 }
3781 #endif
3782 }
3783 return JNI_OK;
3784 }
3785
print_options(const JavaVMInitArgs * args)3786 static void print_options(const JavaVMInitArgs *args) {
3787 const char* tail;
3788 for (int index = 0; index < args->nOptions; index++) {
3789 const JavaVMOption *option = args->options + index;
3790 if (match_option(option, "-XX:", &tail)) {
3791 logOption(tail);
3792 }
3793 }
3794 }
3795
handle_deprecated_print_gc_flags()3796 bool Arguments::handle_deprecated_print_gc_flags() {
3797 if (PrintGC) {
3798 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3799 }
3800 if (PrintGCDetails) {
3801 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3802 }
3803
3804 if (_gc_log_filename != NULL) {
3805 // -Xloggc was used to specify a filename
3806 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3807
3808 LogTarget(Error, logging) target;
3809 LogStream errstream(target);
3810 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3811 } else if (PrintGC || PrintGCDetails) {
3812 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3813 }
3814 return true;
3815 }
3816
apply_debugger_ergo()3817 static void apply_debugger_ergo() {
3818 if (ReplayCompiles) {
3819 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3820 }
3821
3822 if (UseDebuggerErgo) {
3823 // Turn on sub-flags
3824 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3825 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3826 }
3827
3828 if (UseDebuggerErgo2) {
3829 // Debugging with limited number of CPUs
3830 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3831 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3832 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3833 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3834 }
3835 }
3836
3837 // Parse entry point called from JNI_CreateJavaVM
3838
parse(const JavaVMInitArgs * initial_cmd_args)3839 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3840 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3841 JVMFlag::check_all_flag_declarations();
3842
3843 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3844 const char* hotspotrc = ".hotspotrc";
3845 bool settings_file_specified = false;
3846 bool needs_hotspotrc_warning = false;
3847 ScopedVMInitArgs initial_vm_options_args("");
3848 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3849 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3850
3851 // Pointers to current working set of containers
3852 JavaVMInitArgs* cur_cmd_args;
3853 JavaVMInitArgs* cur_vm_options_args;
3854 JavaVMInitArgs* cur_java_options_args;
3855 JavaVMInitArgs* cur_java_tool_options_args;
3856
3857 // Containers for modified/expanded options
3858 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3859 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3860 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3861 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3862
3863
3864 jint code =
3865 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3866 if (code != JNI_OK) {
3867 return code;
3868 }
3869
3870 code = parse_java_options_environment_variable(&initial_java_options_args);
3871 if (code != JNI_OK) {
3872 return code;
3873 }
3874
3875 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3876 char *vmoptions = ClassLoader::lookup_vm_options();
3877 if (vmoptions != NULL) {
3878 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3879 FREE_C_HEAP_ARRAY(char, vmoptions);
3880 if (code != JNI_OK) {
3881 return code;
3882 }
3883 }
3884
3885 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3886 &mod_java_tool_options_args,
3887 &cur_java_tool_options_args);
3888 if (code != JNI_OK) {
3889 return code;
3890 }
3891
3892 code = expand_vm_options_as_needed(initial_cmd_args,
3893 &mod_cmd_args,
3894 &cur_cmd_args);
3895 if (code != JNI_OK) {
3896 return code;
3897 }
3898
3899 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3900 &mod_java_options_args,
3901 &cur_java_options_args);
3902 if (code != JNI_OK) {
3903 return code;
3904 }
3905
3906 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3907 &mod_vm_options_args,
3908 &cur_vm_options_args);
3909 if (code != JNI_OK) {
3910 return code;
3911 }
3912
3913 const char* flags_file = Arguments::get_jvm_flags_file();
3914 settings_file_specified = (flags_file != NULL);
3915
3916 if (IgnoreUnrecognizedVMOptions) {
3917 cur_cmd_args->ignoreUnrecognized = true;
3918 cur_java_tool_options_args->ignoreUnrecognized = true;
3919 cur_java_options_args->ignoreUnrecognized = true;
3920 }
3921
3922 // Parse specified settings file
3923 if (settings_file_specified) {
3924 if (!process_settings_file(flags_file, true,
3925 cur_cmd_args->ignoreUnrecognized)) {
3926 return JNI_EINVAL;
3927 }
3928 } else {
3929 #ifdef ASSERT
3930 // Parse default .hotspotrc settings file
3931 if (!process_settings_file(".hotspotrc", false,
3932 cur_cmd_args->ignoreUnrecognized)) {
3933 return JNI_EINVAL;
3934 }
3935 #else
3936 struct stat buf;
3937 if (os::stat(hotspotrc, &buf) == 0) {
3938 needs_hotspotrc_warning = true;
3939 }
3940 #endif
3941 }
3942
3943 if (PrintVMOptions) {
3944 print_options(cur_java_tool_options_args);
3945 print_options(cur_cmd_args);
3946 print_options(cur_java_options_args);
3947 }
3948
3949 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3950 jint result = parse_vm_init_args(cur_vm_options_args,
3951 cur_java_tool_options_args,
3952 cur_java_options_args,
3953 cur_cmd_args);
3954
3955 if (result != JNI_OK) {
3956 return result;
3957 }
3958
3959 // Delay warning until here so that we've had a chance to process
3960 // the -XX:-PrintWarnings flag
3961 if (needs_hotspotrc_warning) {
3962 warning("%s file is present but has been ignored. "
3963 "Run with -XX:Flags=%s to load the file.",
3964 hotspotrc, hotspotrc);
3965 }
3966
3967 if (needs_module_property_warning) {
3968 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3969 " names that are reserved for internal use.");
3970 }
3971
3972 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3973 UNSUPPORTED_OPTION(UseLargePages);
3974 #endif
3975
3976 #if defined(AIX)
3977 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3978 #endif
3979
3980 #ifndef PRODUCT
3981 if (TraceBytecodesAt != 0) {
3982 TraceBytecodes = true;
3983 }
3984 if (CountCompiledCalls) {
3985 if (UseCounterDecay) {
3986 warning("UseCounterDecay disabled because CountCalls is set");
3987 UseCounterDecay = false;
3988 }
3989 }
3990 #endif // PRODUCT
3991
3992 if (ScavengeRootsInCode == 0) {
3993 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3994 warning("Forcing ScavengeRootsInCode non-zero");
3995 }
3996 ScavengeRootsInCode = 1;
3997 }
3998
3999 if (!handle_deprecated_print_gc_flags()) {
4000 return JNI_EINVAL;
4001 }
4002
4003 // Set object alignment values.
4004 set_object_alignment();
4005
4006 #if !INCLUDE_CDS
4007 if (DumpSharedSpaces || RequireSharedSpaces) {
4008 jio_fprintf(defaultStream::error_stream(),
4009 "Shared spaces are not supported in this VM\n");
4010 return JNI_ERR;
4011 }
4012 if (DumpLoadedClassList != NULL) {
4013 jio_fprintf(defaultStream::error_stream(),
4014 "DumpLoadedClassList is not supported in this VM\n");
4015 return JNI_ERR;
4016 }
4017 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4018 log_is_enabled(Info, cds)) {
4019 warning("Shared spaces are not supported in this VM");
4020 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4021 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4022 }
4023 no_shared_spaces("CDS Disabled");
4024 #endif // INCLUDE_CDS
4025
4026 #ifndef TIERED
4027 if (FLAG_IS_CMDLINE(CompilationMode)) {
4028 warning("CompilationMode has no effect in non-tiered VMs");
4029 }
4030 #endif
4031
4032 apply_debugger_ergo();
4033
4034 return JNI_OK;
4035 }
4036
apply_ergo()4037 jint Arguments::apply_ergo() {
4038 // Set flags based on ergonomics.
4039 jint result = set_ergonomics_flags();
4040 if (result != JNI_OK) return result;
4041
4042 // Set heap size based on available physical memory
4043 set_heap_size();
4044
4045 GCConfig::arguments()->initialize();
4046
4047 result = set_shared_spaces_flags_and_archive_paths();
4048 if (result != JNI_OK) return result;
4049
4050 // Initialize Metaspace flags and alignments
4051 Metaspace::ergo_initialize();
4052
4053 // Set compiler flags after GC is selected and GC specific
4054 // flags (LoopStripMiningIter) are set.
4055 CompilerConfig::ergo_initialize();
4056
4057 // Set bytecode rewriting flags
4058 set_bytecode_flags();
4059
4060 // Set flags if aggressive optimization flags are enabled
4061 jint code = set_aggressive_opts_flags();
4062 if (code != JNI_OK) {
4063 return code;
4064 }
4065
4066 // Turn off biased locking for locking debug mode flags,
4067 // which are subtly different from each other but neither works with
4068 // biased locking
4069 if (UseHeavyMonitors
4070 #ifdef COMPILER1
4071 || !UseFastLocking
4072 #endif // COMPILER1
4073 #if INCLUDE_JVMCI
4074 || !JVMCIUseFastLocking
4075 #endif
4076 ) {
4077 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4078 // flag set to true on command line; warn the user that they
4079 // can't enable biased locking here
4080 warning("Biased Locking is not supported with locking debug flags"
4081 "; ignoring UseBiasedLocking flag." );
4082 }
4083 UseBiasedLocking = false;
4084 }
4085
4086 #ifdef ZERO
4087 // Clear flags not supported on zero.
4088 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4089 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4090 #endif // ZERO
4091
4092 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4093 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4094 DebugNonSafepoints = true;
4095 }
4096
4097 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4098 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4099 }
4100
4101 // Treat the odd case where local verification is enabled but remote
4102 // verification is not as if both were enabled.
4103 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4104 log_info(verification)("Turning on remote verification because local verification is on");
4105 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4106 }
4107
4108 #ifndef PRODUCT
4109 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4110 if (use_vm_log()) {
4111 LogVMOutput = true;
4112 }
4113 }
4114 #endif // PRODUCT
4115
4116 if (PrintCommandLineFlags) {
4117 JVMFlag::printSetFlags(tty);
4118 }
4119
4120 // Apply CPU specific policy for the BiasedLocking
4121 if (UseBiasedLocking) {
4122 if (!VM_Version::use_biased_locking() &&
4123 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4124 UseBiasedLocking = false;
4125 }
4126 }
4127 #ifdef COMPILER2
4128 if (!UseBiasedLocking) {
4129 UseOptoBiasInlining = false;
4130 }
4131
4132 if (!EnableVectorSupport) {
4133 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4134 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4135 }
4136 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4137
4138 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4139 if (!EnableVectorReboxing) {
4140 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4141 } else {
4142 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4143 }
4144 }
4145 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4146 }
4147 #endif // COMPILER2
4148
4149 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4150 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4151 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4152 }
4153 }
4154 return JNI_OK;
4155 }
4156
adjust_after_os()4157 jint Arguments::adjust_after_os() {
4158 if (UseNUMA) {
4159 if (UseParallelGC) {
4160 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4161 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4162 }
4163 }
4164 }
4165 return JNI_OK;
4166 }
4167
PropertyList_count(SystemProperty * pl)4168 int Arguments::PropertyList_count(SystemProperty* pl) {
4169 int count = 0;
4170 while(pl != NULL) {
4171 count++;
4172 pl = pl->next();
4173 }
4174 return count;
4175 }
4176
4177 // Return the number of readable properties.
PropertyList_readable_count(SystemProperty * pl)4178 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4179 int count = 0;
4180 while(pl != NULL) {
4181 if (pl->is_readable()) {
4182 count++;
4183 }
4184 pl = pl->next();
4185 }
4186 return count;
4187 }
4188
PropertyList_get_value(SystemProperty * pl,const char * key)4189 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4190 assert(key != NULL, "just checking");
4191 SystemProperty* prop;
4192 for (prop = pl; prop != NULL; prop = prop->next()) {
4193 if (strcmp(key, prop->key()) == 0) return prop->value();
4194 }
4195 return NULL;
4196 }
4197
4198 // Return the value of the requested property provided that it is a readable property.
PropertyList_get_readable_value(SystemProperty * pl,const char * key)4199 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4200 assert(key != NULL, "just checking");
4201 SystemProperty* prop;
4202 // Return the property value if the keys match and the property is not internal or
4203 // it's the special internal property "jdk.boot.class.path.append".
4204 for (prop = pl; prop != NULL; prop = prop->next()) {
4205 if (strcmp(key, prop->key()) == 0) {
4206 if (!prop->internal()) {
4207 return prop->value();
4208 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4209 return prop->value();
4210 } else {
4211 // Property is internal and not jdk.boot.class.path.append so return NULL.
4212 return NULL;
4213 }
4214 }
4215 }
4216 return NULL;
4217 }
4218
PropertyList_get_key_at(SystemProperty * pl,int index)4219 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4220 int count = 0;
4221 const char* ret_val = NULL;
4222
4223 while(pl != NULL) {
4224 if(count >= index) {
4225 ret_val = pl->key();
4226 break;
4227 }
4228 count++;
4229 pl = pl->next();
4230 }
4231
4232 return ret_val;
4233 }
4234
PropertyList_get_value_at(SystemProperty * pl,int index)4235 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4236 int count = 0;
4237 char* ret_val = NULL;
4238
4239 while(pl != NULL) {
4240 if(count >= index) {
4241 ret_val = pl->value();
4242 break;
4243 }
4244 count++;
4245 pl = pl->next();
4246 }
4247
4248 return ret_val;
4249 }
4250
PropertyList_add(SystemProperty ** plist,SystemProperty * new_p)4251 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4252 SystemProperty* p = *plist;
4253 if (p == NULL) {
4254 *plist = new_p;
4255 } else {
4256 while (p->next() != NULL) {
4257 p = p->next();
4258 }
4259 p->set_next(new_p);
4260 }
4261 }
4262
PropertyList_add(SystemProperty ** plist,const char * k,const char * v,bool writeable,bool internal)4263 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4264 bool writeable, bool internal) {
4265 if (plist == NULL)
4266 return;
4267
4268 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4269 PropertyList_add(plist, new_p);
4270 }
4271
PropertyList_add(SystemProperty * element)4272 void Arguments::PropertyList_add(SystemProperty *element) {
4273 PropertyList_add(&_system_properties, element);
4274 }
4275
4276 // This add maintains unique property key in the list.
PropertyList_unique_add(SystemProperty ** plist,const char * k,const char * v,PropertyAppendable append,PropertyWriteable writeable,PropertyInternal internal)4277 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4278 PropertyAppendable append, PropertyWriteable writeable,
4279 PropertyInternal internal) {
4280 if (plist == NULL)
4281 return;
4282
4283 // If property key exists and is writeable, then update with new value.
4284 // Trying to update a non-writeable property is silently ignored.
4285 SystemProperty* prop;
4286 for (prop = *plist; prop != NULL; prop = prop->next()) {
4287 if (strcmp(k, prop->key()) == 0) {
4288 if (append == AppendProperty) {
4289 prop->append_writeable_value(v);
4290 } else {
4291 prop->set_writeable_value(v);
4292 }
4293 return;
4294 }
4295 }
4296
4297 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4298 }
4299
4300 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4301 // Returns true if all of the source pointed by src has been copied over to
4302 // the destination buffer pointed by buf. Otherwise, returns false.
4303 // Notes:
4304 // 1. If the length (buflen) of the destination buffer excluding the
4305 // NULL terminator character is not long enough for holding the expanded
4306 // pid characters, it also returns false instead of returning the partially
4307 // expanded one.
4308 // 2. The passed in "buflen" should be large enough to hold the null terminator.
copy_expand_pid(const char * src,size_t srclen,char * buf,size_t buflen)4309 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4310 char* buf, size_t buflen) {
4311 const char* p = src;
4312 char* b = buf;
4313 const char* src_end = &src[srclen];
4314 char* buf_end = &buf[buflen - 1];
4315
4316 while (p < src_end && b < buf_end) {
4317 if (*p == '%') {
4318 switch (*(++p)) {
4319 case '%': // "%%" ==> "%"
4320 *b++ = *p++;
4321 break;
4322 case 'p': { // "%p" ==> current process id
4323 // buf_end points to the character before the last character so
4324 // that we could write '\0' to the end of the buffer.
4325 size_t buf_sz = buf_end - b + 1;
4326 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4327
4328 // if jio_snprintf fails or the buffer is not long enough to hold
4329 // the expanded pid, returns false.
4330 if (ret < 0 || ret >= (int)buf_sz) {
4331 return false;
4332 } else {
4333 b += ret;
4334 assert(*b == '\0', "fail in copy_expand_pid");
4335 if (p == src_end && b == buf_end + 1) {
4336 // reach the end of the buffer.
4337 return true;
4338 }
4339 }
4340 p++;
4341 break;
4342 }
4343 default :
4344 *b++ = '%';
4345 }
4346 } else {
4347 *b++ = *p++;
4348 }
4349 }
4350 *b = '\0';
4351 return (p == src_end); // return false if not all of the source was copied
4352 }
4353