1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/collectorPolicy.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/flags/jvmFlag.hpp"
46 #include "runtime/flags/jvmFlagConstraintList.hpp"
47 #include "runtime/flags/jvmFlagWriteableList.hpp"
48 #include "runtime/flags/jvmFlagRangeList.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.inline.hpp"
52 #include "runtime/safepoint.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64 #if INCLUDE_JFR
65 #include "jfr/jfr.hpp"
66 #endif
67
68 // Note: This is a special bug reporting site for the JVM
69 #ifdef VENDOR_URL_VM_BUG
70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
71 #else
72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
73 #endif
74 #define DEFAULT_JAVA_LAUNCHER "generic"
75
76 char* Arguments::_jvm_flags_file = NULL;
77 char** Arguments::_jvm_flags_array = NULL;
78 int Arguments::_num_jvm_flags = 0;
79 char** Arguments::_jvm_args_array = NULL;
80 int Arguments::_num_jvm_args = 0;
81 char* Arguments::_java_command = NULL;
82 SystemProperty* Arguments::_system_properties = NULL;
83 const char* Arguments::_gc_log_filename = NULL;
84 size_t Arguments::_conservative_max_heap_alignment = 0;
85 size_t Arguments::_min_heap_size = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 bool Arguments::_enable_preview = false;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 abort_hook_t Arguments::_abort_hook = NULL;
110 exit_hook_t Arguments::_exit_hook = NULL;
111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
115 SystemProperty *Arguments::_java_library_path = NULL;
116 SystemProperty *Arguments::_java_home = NULL;
117 SystemProperty *Arguments::_java_class_path = NULL;
118 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
119 SystemProperty *Arguments::_vm_info = NULL;
120
121 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
122 PathString *Arguments::_system_boot_class_path = NULL;
123 bool Arguments::_has_jimage = false;
124
125 char* Arguments::_ext_dirs = NULL;
126
127 bool PathString::set_value(const char *value) {
128 if (_value != NULL) {
129 FreeHeap(_value);
130 }
131 _value = AllocateHeap(strlen(value)+1, mtArguments);
132 assert(_value != NULL, "Unable to allocate space for new path value");
133 if (_value != NULL) {
134 strcpy(_value, value);
135 } else {
136 // not able to allocate
137 return false;
138 }
139 return true;
140 }
141
142 void PathString::append_value(const char *value) {
143 char *sp;
144 size_t len = 0;
145 if (value != NULL) {
146 len = strlen(value);
147 if (_value != NULL) {
148 len += strlen(_value);
149 }
150 sp = AllocateHeap(len+2, mtArguments);
151 assert(sp != NULL, "Unable to allocate space for new append path value");
152 if (sp != NULL) {
153 if (_value != NULL) {
154 strcpy(sp, _value);
155 strcat(sp, os::path_separator());
156 strcat(sp, value);
157 FreeHeap(_value);
158 } else {
159 strcpy(sp, value);
160 }
161 _value = sp;
162 }
163 }
164 }
165
166 PathString::PathString(const char* value) {
167 if (value == NULL) {
168 _value = NULL;
169 } else {
170 _value = AllocateHeap(strlen(value)+1, mtArguments);
171 strcpy(_value, value);
172 }
173 }
174
175 PathString::~PathString() {
176 if (_value != NULL) {
177 FreeHeap(_value);
178 _value = NULL;
179 }
180 }
181
182 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
183 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
184 size_t len = strlen(module_name) + 1;
185 _module_name = AllocateHeap(len, mtInternal);
186 strncpy(_module_name, module_name, len); // copy the trailing null
187 _path = new PathString(path);
188 }
189
190 ModulePatchPath::~ModulePatchPath() {
191 if (_module_name != NULL) {
192 FreeHeap(_module_name);
193 _module_name = NULL;
194 }
195 if (_path != NULL) {
196 delete _path;
197 _path = NULL;
198 }
199 }
200
201 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
202 if (key == NULL) {
203 _key = NULL;
204 } else {
205 _key = AllocateHeap(strlen(key)+1, mtArguments);
206 strcpy(_key, key);
207 }
208 _next = NULL;
209 _internal = internal;
210 _writeable = writeable;
211 }
212
213 AgentLibrary::AgentLibrary(const char* name, const char* options,
214 bool is_absolute_path, void* os_lib,
215 bool instrument_lib) {
216 _name = AllocateHeap(strlen(name)+1, mtArguments);
217 strcpy(_name, name);
218 if (options == NULL) {
219 _options = NULL;
220 } else {
221 _options = AllocateHeap(strlen(options)+1, mtArguments);
222 strcpy(_options, options);
223 }
224 _is_absolute_path = is_absolute_path;
225 _os_lib = os_lib;
226 _next = NULL;
227 _state = agent_invalid;
228 _is_static_lib = false;
229 _is_instrument_lib = instrument_lib;
230 }
231
232 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
233 // part of the option string.
234 static bool match_option(const JavaVMOption *option, const char* name,
235 const char** tail) {
236 size_t len = strlen(name);
237 if (strncmp(option->optionString, name, len) == 0) {
238 *tail = option->optionString + len;
239 return true;
240 } else {
241 return false;
242 }
243 }
244
245 // Check if 'option' matches 'name'. No "tail" is allowed.
246 static bool match_option(const JavaVMOption *option, const char* name) {
247 const char* tail = NULL;
248 bool result = match_option(option, name, &tail);
249 if (tail != NULL && *tail == '\0') {
250 return result;
251 } else {
252 return false;
253 }
254 }
255
256 // Return true if any of the strings in null-terminated array 'names' matches.
257 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
258 // the option must match exactly.
259 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
260 bool tail_allowed) {
261 for (/* empty */; *names != NULL; ++names) {
262 if (match_option(option, *names, tail)) {
263 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
264 return true;
265 }
266 }
267 }
268 return false;
269 }
270
271 #if INCLUDE_JFR
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 return Jfr::on_flight_recorder_option(option, tail);
280 }
281 return false;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
330 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
331 }
332
333 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
334 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
335 return ((strncmp(option, property, len) == 0) &&
336 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
337 }
338
339 // Return true if property starts with "jdk.module." and its ensuing chars match
340 // any of the reserved module properties.
341 // property should be passed without the leading "-D".
342 bool Arguments::is_internal_module_property(const char* property) {
343 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
347 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
348 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
349 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
350 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
351 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
352 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
353 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
354 return true;
355 }
356 }
357 return false;
358 }
359
360 // Process java launcher properties.
361 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
362 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
363 // sun.java.launcher.pid is defined.
364 // Must do this before setting up other system properties,
365 // as some of them may depend on launcher type.
366 for (int index = 0; index < args->nOptions; index++) {
367 const JavaVMOption* option = args->options + index;
368 const char* tail;
369
370 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
371 process_java_launcher_argument(tail, option->extraInfo);
372 continue;
373 }
374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
375 if (strcmp(tail, "true") == 0) {
376 _sun_java_launcher_is_altjvm = true;
377 }
378 continue;
379 }
380 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
381 _sun_java_launcher_pid = atoi(tail);
382 continue;
383 }
384 }
385 }
386
387 // Initialize system properties key and value.
388 void Arguments::init_system_properties() {
389
390 // Set up _system_boot_class_path which is not a property but
391 // relies heavily on argument processing and the jdk.boot.class.path.append
392 // property. It is used to store the underlying system boot class path.
393 _system_boot_class_path = new PathString(NULL);
394
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
396 "Java Virtual Machine Specification", false));
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
399 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
400
401 // Initialize the vm.info now, but it will need updating after argument parsing.
402 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
403
404 // Following are JVMTI agent writable properties.
405 // Properties values are set to NULL and they are
406 // os specific they are initialized in os::init_system_properties_values().
407 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
408 _java_library_path = new SystemProperty("java.library.path", NULL, true);
409 _java_home = new SystemProperty("java.home", NULL, true);
410 _java_class_path = new SystemProperty("java.class.path", "", true);
411 // jdk.boot.class.path.append is a non-writeable, internal property.
412 // It can only be set by either:
413 // - -Xbootclasspath/a:
414 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
415 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
416
417 // Add to System Property list.
418 PropertyList_add(&_system_properties, _sun_boot_library_path);
419 PropertyList_add(&_system_properties, _java_library_path);
420 PropertyList_add(&_system_properties, _java_home);
421 PropertyList_add(&_system_properties, _java_class_path);
422 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
423 PropertyList_add(&_system_properties, _vm_info);
424
425 // Set OS specific system properties values
426 os::init_system_properties_values();
427 }
428
429 // Update/Initialize System properties after JDK version number is known
430 void Arguments::init_version_specific_system_properties() {
431 enum { bufsz = 16 };
432 char buffer[bufsz];
433 const char* spec_vendor = "Oracle Corporation";
434 uint32_t spec_version = JDK_Version::current().major_version();
435
436 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
437
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.version", buffer, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
444 }
445
446 /*
447 * -XX argument processing:
448 *
449 * -XX arguments are defined in several places, such as:
450 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
451 * -XX arguments are parsed in parse_argument().
452 * -XX argument bounds checking is done in check_vm_args_consistency().
453 *
454 * Over time -XX arguments may change. There are mechanisms to handle common cases:
455 *
456 * ALIASED: An option that is simply another name for another option. This is often
457 * part of the process of deprecating a flag, but not all aliases need
458 * to be deprecated.
459 *
460 * Create an alias for an option by adding the old and new option names to the
461 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
462 *
463 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
464 * support may be removed in the future. Both regular and aliased options may be
465 * deprecated.
466 *
467 * Add a deprecation warning for an option (or alias) by adding an entry in the
468 * "special_jvm_flags" table and setting the "deprecated_in" field.
469 * Often an option "deprecated" in one major release will
470 * be made "obsolete" in the next. In this case the entry should also have its
471 * "obsolete_in" field set.
472 *
473 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
474 * on the command line. A warning is printed to let the user know that option might not
475 * be accepted in the future.
476 *
477 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
478 * table and setting the "obsolete_in" field.
479 *
480 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
481 * to the current JDK version. The system will flatly refuse to admit the existence of
482 * the flag. This allows a flag to die automatically over JDK releases.
483 *
484 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
485 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
486 * - Newly obsolete or expired deprecated options should have their global variable
487 * definitions removed (from globals.hpp, etc) and related implementations removed.
488 *
489 * Recommended approach for removing options:
490 *
491 * To remove options commonly used by customers (e.g. product -XX options), use
492 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
493 *
494 * To remove internal options (e.g. diagnostic, experimental, develop options), use
495 * a 2-step model adding major release numbers to the obsolete and expire columns.
496 *
497 * To change the name of an option, use the alias table as well as a 2-step
498 * model adding major release numbers to the deprecate and expire columns.
499 * Think twice about aliasing commonly used customer options.
500 *
501 * There are times when it is appropriate to leave a future release number as undefined.
502 *
503 * Tests: Aliases should be tested in VMAliasOptions.java.
504 * Deprecated options should be tested in VMDeprecatedOptions.java.
505 */
506
507 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
508 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
509 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
510 // the command-line as usual, but will issue a warning.
511 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
512 // the command-line, while issuing a warning and ignoring the flag value.
513 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
514 // existence of the flag.
515 //
516 // MANUAL CLEANUP ON JDK VERSION UPDATES:
517 // This table ensures that the handling of options will update automatically when the JDK
518 // version is incremented, but the source code needs to be cleanup up manually:
519 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
520 // variable should be removed, as well as users of the variable.
521 // - As "deprecated" options age into "obsolete" options, move the entry into the
522 // "Obsolete Flags" section of the table.
523 // - All expired options should be removed from the table.
524 static SpecialFlag const special_jvm_flags[] = {
525 // -------------- Deprecated Flags --------------
526 // --- Non-alias flags - sorted by obsolete_in then expired_in:
527 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
529 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
530 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
537 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
538 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
539
540 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
541 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
542 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
543 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
544 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
545 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
546
547 // -------------- Obsolete Flags - sorted by expired_in --------------
548 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
549 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
550 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
551 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
552 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
553 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
554 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
555 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
556 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
557 { "TraceScavenge", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
558 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
559 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
560 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
561 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
562 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
563 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
564 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
565 { "InlineNotify", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
566 { "EnableTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
567 { "UseLockedTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
568 { "NativeMonitorTimeout", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
569 { "NativeMonitorSpinLimit", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
570 { "NativeMonitorFlags", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
571 { "UnlinkSymbolsALot", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
572 { "AllowNonVirtualCalls", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
573 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
574 { "PrintSafepointStatisticsTimeout",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
575 { "PrintSafepointStatisticsCount", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
576 { "TransmitErrorReport", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
577 { "ErrorReportServer", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
578 { "EmitSync", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
579 { "SyncVerbose", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
580 { "SyncFlags", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
581 { "SyncKnobs", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
582 { "UseBootstrapCallInfo", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
583
584 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
585 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
586 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
587 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
588 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
589 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
590 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
591 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
592 #endif
593
594 { NULL, JDK_Version(0), JDK_Version(0) }
595 };
596
597 // Flags that are aliases for other flags.
598 typedef struct {
599 const char* alias_name;
600 const char* real_name;
601 } AliasedFlag;
602
603 static AliasedFlag const aliased_jvm_flags[] = {
604 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
605 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
606 { NULL, NULL}
607 };
608
609 // NOTE: A compatibility request will be necessary for each alias to be removed.
610 static AliasedLoggingFlag const aliased_logging_flags[] = {
611 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
612 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
613 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
614 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
615 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
616 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
617 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
618 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
619 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
620 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
621 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
622 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
623 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
624 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
625 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
626 };
627
628 #ifndef PRODUCT
629 // These options are removed in jdk9. Remove this code for jdk10.
630 static AliasedFlag const removed_develop_logging_flags[] = {
631 { "TraceClassInitialization", "-Xlog:class+init" },
632 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
633 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
634 { "TraceItables", "-Xlog:itables=debug" },
635 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
636 { "TraceSafepoint", "-Xlog:safepoint=debug" },
637 { "TraceStartupTime", "-Xlog:startuptime" },
638 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
639 { "PrintVtables", "-Xlog:vtables=debug" },
640 { "VerboseVerification", "-Xlog:verification" },
641 { NULL, NULL }
642 };
643 #endif //PRODUCT
644
645 // Return true if "v" is less than "other", where "other" may be "undefined".
646 static bool version_less_than(JDK_Version v, JDK_Version other) {
647 assert(!v.is_undefined(), "must be defined");
648 if (!other.is_undefined() && v.compare(other) >= 0) {
649 return false;
650 } else {
651 return true;
652 }
653 }
654
655 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
656
657 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
658 // Allow extensions to have priority
659 if (lookup_special_flag_ext(flag_name, flag)) {
660 return true;
661 }
662
663 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
664 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
665 flag = special_jvm_flags[i];
666 return true;
667 }
668 }
669 return false;
670 }
671
672 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
673 assert(version != NULL, "Must provide a version buffer");
674 SpecialFlag flag;
675 if (lookup_special_flag(flag_name, flag)) {
676 if (!flag.obsolete_in.is_undefined()) {
677 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
678 *version = flag.obsolete_in;
679 return true;
680 }
681 }
682 }
683 return false;
684 }
685
686 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
687 assert(version != NULL, "Must provide a version buffer");
688 SpecialFlag flag;
689 if (lookup_special_flag(flag_name, flag)) {
690 if (!flag.deprecated_in.is_undefined()) {
691 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
692 version_less_than(JDK_Version::current(), flag.expired_in)) {
693 *version = flag.deprecated_in;
694 return 1;
695 } else {
696 return -1;
697 }
698 }
699 }
700 return 0;
701 }
702
703 #ifndef PRODUCT
704 const char* Arguments::removed_develop_logging_flag_name(const char* name){
705 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
706 const AliasedFlag& flag = removed_develop_logging_flags[i];
707 if (strcmp(flag.alias_name, name) == 0) {
708 return flag.real_name;
709 }
710 }
711 return NULL;
712 }
713 #endif // PRODUCT
714
715 const char* Arguments::real_flag_name(const char *flag_name) {
716 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
717 const AliasedFlag& flag_status = aliased_jvm_flags[i];
718 if (strcmp(flag_status.alias_name, flag_name) == 0) {
719 return flag_status.real_name;
720 }
721 }
722 return flag_name;
723 }
724
725 #ifdef ASSERT
726 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
727 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
728 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
729 return true;
730 }
731 }
732 return false;
733 }
734
735 // Verifies the correctness of the entries in the special_jvm_flags table.
736 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
737 // version being earlier than the deprecation version, then a warning is issued
738 // and verification fails - by returning false. If it is detected that the table
739 // is out of date, with respect to the current version, then a warning is issued
740 // but verification does not fail. This allows the VM to operate when the version
741 // is first updated, without needing to update all the impacted flags at the
742 // same time.
743 static bool verify_special_jvm_flags() {
744 bool success = true;
745 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
746 const SpecialFlag& flag = special_jvm_flags[i];
747 if (lookup_special_flag(flag.name, i)) {
748 warning("Duplicate special flag declaration \"%s\"", flag.name);
749 success = false;
750 }
751 if (flag.deprecated_in.is_undefined() &&
752 flag.obsolete_in.is_undefined()) {
753 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
754 success = false;
755 }
756
757 if (!flag.deprecated_in.is_undefined()) {
758 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
759 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
760 success = false;
761 }
762
763 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
764 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
765 success = false;
766 }
767 }
768
769 if (!flag.obsolete_in.is_undefined()) {
770 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
771 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
772 success = false;
773 }
774
775 // if flag has become obsolete it should not have a "globals" flag defined anymore.
776 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
777 if (JVMFlag::find_flag(flag.name) != NULL) {
778 // Temporarily disable the warning: 8196739
779 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
780 }
781 }
782 }
783
784 if (!flag.expired_in.is_undefined()) {
785 // if flag has become expired it should not have a "globals" flag defined anymore.
786 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
787 if (JVMFlag::find_flag(flag.name) != NULL) {
788 // Temporarily disable the warning: 8196739
789 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
790 }
791 }
792 }
793
794 }
795 return success;
796 }
797 #endif
798
799 // Parses a size specification string.
800 bool Arguments::atojulong(const char *s, julong* result) {
801 julong n = 0;
802
803 // First char must be a digit. Don't allow negative numbers or leading spaces.
804 if (!isdigit(*s)) {
805 return false;
806 }
807
808 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
809 char* remainder;
810 errno = 0;
811 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
812 if (errno != 0) {
813 return false;
814 }
815
816 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
817 if (remainder == s || strlen(remainder) > 1) {
818 return false;
819 }
820
821 switch (*remainder) {
822 case 'T': case 't':
823 *result = n * G * K;
824 // Check for overflow.
825 if (*result/((julong)G * K) != n) return false;
826 return true;
827 case 'G': case 'g':
828 *result = n * G;
829 if (*result/G != n) return false;
830 return true;
831 case 'M': case 'm':
832 *result = n * M;
833 if (*result/M != n) return false;
834 return true;
835 case 'K': case 'k':
836 *result = n * K;
837 if (*result/K != n) return false;
838 return true;
839 case '\0':
840 *result = n;
841 return true;
842 default:
843 return false;
844 }
845 }
846
847 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
848 if (size < min_size) return arg_too_small;
849 if (size > max_size) return arg_too_big;
850 return arg_in_range;
851 }
852
853 // Describe an argument out of range error
854 void Arguments::describe_range_error(ArgsRange errcode) {
855 switch(errcode) {
856 case arg_too_big:
857 jio_fprintf(defaultStream::error_stream(),
858 "The specified size exceeds the maximum "
859 "representable size.\n");
860 break;
861 case arg_too_small:
862 case arg_unreadable:
863 case arg_in_range:
864 // do nothing for now
865 break;
866 default:
867 ShouldNotReachHere();
868 }
869 }
870
871 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
872 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
873 return true;
874 } else {
875 return false;
876 }
877 }
878
879 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
880 char* end;
881 errno = 0;
882 double v = strtod(value, &end);
883 if ((errno != 0) || (*end != 0)) {
884 return false;
885 }
886
887 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
888 return true;
889 }
890 return false;
891 }
892
893 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
894 julong v;
895 int int_v;
896 intx intx_v;
897 bool is_neg = false;
898 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
899
900 if (result == NULL) {
901 return false;
902 }
903
904 // Check the sign first since atojulong() parses only unsigned values.
905 if (*value == '-') {
906 if (!result->is_intx() && !result->is_int()) {
907 return false;
908 }
909 value++;
910 is_neg = true;
911 }
912 if (!Arguments::atojulong(value, &v)) {
913 return false;
914 }
915 if (result->is_int()) {
916 int_v = (int) v;
917 if (is_neg) {
918 int_v = -int_v;
919 }
920 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
921 } else if (result->is_uint()) {
922 uint uint_v = (uint) v;
923 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
924 } else if (result->is_intx()) {
925 intx_v = (intx) v;
926 if (is_neg) {
927 intx_v = -intx_v;
928 }
929 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
930 } else if (result->is_uintx()) {
931 uintx uintx_v = (uintx) v;
932 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
933 } else if (result->is_uint64_t()) {
934 uint64_t uint64_t_v = (uint64_t) v;
935 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
936 } else if (result->is_size_t()) {
937 size_t size_t_v = (size_t) v;
938 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
939 } else if (result->is_double()) {
940 double double_v = (double) v;
941 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
942 } else {
943 return false;
944 }
945 }
946
947 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
948 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
949 // Contract: JVMFlag always returns a pointer that needs freeing.
950 FREE_C_HEAP_ARRAY(char, value);
951 return true;
952 }
953
954 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
955 const char* old_value = "";
956 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
957 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
958 size_t new_len = strlen(new_value);
959 const char* value;
960 char* free_this_too = NULL;
961 if (old_len == 0) {
962 value = new_value;
963 } else if (new_len == 0) {
964 value = old_value;
965 } else {
966 size_t length = old_len + 1 + new_len + 1;
967 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
968 // each new setting adds another LINE to the switch:
969 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
970 value = buf;
971 free_this_too = buf;
972 }
973 (void) JVMFlag::ccstrAtPut(name, &value, origin);
974 // JVMFlag always returns a pointer that needs freeing.
975 FREE_C_HEAP_ARRAY(char, value);
976 if (free_this_too != NULL) {
977 // JVMFlag made its own copy, so I must delete my own temp. buffer.
978 FREE_C_HEAP_ARRAY(char, free_this_too);
979 }
980 return true;
981 }
982
983 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
984 const char* real_name = real_flag_name(arg);
985 JDK_Version since = JDK_Version();
986 switch (is_deprecated_flag(arg, &since)) {
987 case -1:
988 return NULL; // obsolete or expired, don't process normally
989 case 0:
990 return real_name;
991 case 1: {
992 if (warn) {
993 char version[256];
994 since.to_string(version, sizeof(version));
995 if (real_name != arg) {
996 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
997 arg, version, real_name);
998 } else {
999 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1000 arg, version);
1001 }
1002 }
1003 return real_name;
1004 }
1005 }
1006 ShouldNotReachHere();
1007 return NULL;
1008 }
1009
1010 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1011 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1012 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1013 const int max_tagset_size = 256;
1014 int max_tagset_len = max_tagset_size - 1;
1015 char tagset_buffer[max_tagset_size];
1016 tagset_buffer[0] = '\0';
1017
1018 // Write tag-set for aliased logging option, in string list form
1019 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1020 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1021 if (i > 0) {
1022 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1023 }
1024 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1025 }
1026 if (!alf.exactMatch) {
1027 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1028 }
1029 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1030 (on) ? "+" : "-",
1031 name,
1032 tagset_buffer,
1033 (on) ? LogLevel::name(alf.level) : "off");
1034 }
1035
1036 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1037 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1038 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1039 if (strcmp(alf.alias_name, name) == 0) {
1040 log_deprecated_flag(name, on, alf);
1041 return alf;
1042 }
1043 }
1044 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1045 return a;
1046 }
1047
1048 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1049
1050 // range of acceptable characters spelled out for portability reasons
1051 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1052 #define BUFLEN 255
1053 char name[BUFLEN+1];
1054 char dummy;
1055 const char* real_name;
1056 bool warn_if_deprecated = true;
1057
1058 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1059 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1060 if (alf.alias_name != NULL){
1061 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1062 return true;
1063 }
1064 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1065 if (real_name == NULL) {
1066 return false;
1067 }
1068 return set_bool_flag(real_name, false, origin);
1069 }
1070 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1071 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1072 if (alf.alias_name != NULL){
1073 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1074 return true;
1075 }
1076 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1077 if (real_name == NULL) {
1078 return false;
1079 }
1080 return set_bool_flag(real_name, true, origin);
1081 }
1082
1083 char punct;
1084 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1085 const char* value = strchr(arg, '=') + 1;
1086 JVMFlag* flag;
1087
1088 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1089 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1090 if (alf.alias_name != NULL) {
1091 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1092 return true;
1093 }
1094 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1095 if (real_name == NULL) {
1096 return false;
1097 }
1098 flag = JVMFlag::find_flag(real_name);
1099 if (flag != NULL && flag->is_ccstr()) {
1100 if (flag->ccstr_accumulates()) {
1101 return append_to_string_flag(real_name, value, origin);
1102 } else {
1103 if (value[0] == '\0') {
1104 value = NULL;
1105 }
1106 return set_string_flag(real_name, value, origin);
1107 }
1108 } else {
1109 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1110 }
1111 }
1112
1113 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1114 const char* value = strchr(arg, '=') + 1;
1115 // -XX:Foo:=xxx will reset the string flag to the given value.
1116 if (value[0] == '\0') {
1117 value = NULL;
1118 }
1119 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1120 if (real_name == NULL) {
1121 return false;
1122 }
1123 return set_string_flag(real_name, value, origin);
1124 }
1125
1126 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1127 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1128 #define NUMBER_RANGE "[0123456789eE+-]"
1129 char value[BUFLEN + 1];
1130 char value2[BUFLEN + 1];
1131 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1132 // Looks like a floating-point number -- try again with more lenient format string
1133 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1134 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1135 if (real_name == NULL) {
1136 return false;
1137 }
1138 return set_fp_numeric_flag(real_name, value, origin);
1139 }
1140 }
1141
1142 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1143 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1144 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1145 if (real_name == NULL) {
1146 return false;
1147 }
1148 return set_numeric_flag(real_name, value, origin);
1149 }
1150
1151 return false;
1152 }
1153
1154 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1155 assert(bldarray != NULL, "illegal argument");
1156
1157 if (arg == NULL) {
1158 return;
1159 }
1160
1161 int new_count = *count + 1;
1162
1163 // expand the array and add arg to the last element
1164 if (*bldarray == NULL) {
1165 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1166 } else {
1167 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1168 }
1169 (*bldarray)[*count] = os::strdup_check_oom(arg);
1170 *count = new_count;
1171 }
1172
1173 void Arguments::build_jvm_args(const char* arg) {
1174 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1175 }
1176
1177 void Arguments::build_jvm_flags(const char* arg) {
1178 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1179 }
1180
1181 // utility function to return a string that concatenates all
1182 // strings in a given char** array
1183 const char* Arguments::build_resource_string(char** args, int count) {
1184 if (args == NULL || count == 0) {
1185 return NULL;
1186 }
1187 size_t length = 0;
1188 for (int i = 0; i < count; i++) {
1189 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1190 }
1191 char* s = NEW_RESOURCE_ARRAY(char, length);
1192 char* dst = s;
1193 for (int j = 0; j < count; j++) {
1194 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1195 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1196 dst += offset;
1197 length -= offset;
1198 }
1199 return (const char*) s;
1200 }
1201
1202 void Arguments::print_on(outputStream* st) {
1203 st->print_cr("VM Arguments:");
1204 if (num_jvm_flags() > 0) {
1205 st->print("jvm_flags: "); print_jvm_flags_on(st);
1206 st->cr();
1207 }
1208 if (num_jvm_args() > 0) {
1209 st->print("jvm_args: "); print_jvm_args_on(st);
1210 st->cr();
1211 }
1212 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1213 if (_java_class_path != NULL) {
1214 char* path = _java_class_path->value();
1215 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1216 }
1217 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1218 }
1219
1220 void Arguments::print_summary_on(outputStream* st) {
1221 // Print the command line. Environment variables that are helpful for
1222 // reproducing the problem are written later in the hs_err file.
1223 // flags are from setting file
1224 if (num_jvm_flags() > 0) {
1225 st->print_raw("Settings File: ");
1226 print_jvm_flags_on(st);
1227 st->cr();
1228 }
1229 // args are the command line and environment variable arguments.
1230 st->print_raw("Command Line: ");
1231 if (num_jvm_args() > 0) {
1232 print_jvm_args_on(st);
1233 }
1234 // this is the classfile and any arguments to the java program
1235 if (java_command() != NULL) {
1236 st->print("%s", java_command());
1237 }
1238 st->cr();
1239 }
1240
1241 void Arguments::print_jvm_flags_on(outputStream* st) {
1242 if (_num_jvm_flags > 0) {
1243 for (int i=0; i < _num_jvm_flags; i++) {
1244 st->print("%s ", _jvm_flags_array[i]);
1245 }
1246 }
1247 }
1248
1249 void Arguments::print_jvm_args_on(outputStream* st) {
1250 if (_num_jvm_args > 0) {
1251 for (int i=0; i < _num_jvm_args; i++) {
1252 st->print("%s ", _jvm_args_array[i]);
1253 }
1254 }
1255 }
1256
1257 bool Arguments::process_argument(const char* arg,
1258 jboolean ignore_unrecognized,
1259 JVMFlag::Flags origin) {
1260 JDK_Version since = JDK_Version();
1261
1262 if (parse_argument(arg, origin)) {
1263 return true;
1264 }
1265
1266 // Determine if the flag has '+', '-', or '=' characters.
1267 bool has_plus_minus = (*arg == '+' || *arg == '-');
1268 const char* const argname = has_plus_minus ? arg + 1 : arg;
1269
1270 size_t arg_len;
1271 const char* equal_sign = strchr(argname, '=');
1272 if (equal_sign == NULL) {
1273 arg_len = strlen(argname);
1274 } else {
1275 arg_len = equal_sign - argname;
1276 }
1277
1278 // Only make the obsolete check for valid arguments.
1279 if (arg_len <= BUFLEN) {
1280 // Construct a string which consists only of the argument name without '+', '-', or '='.
1281 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1282 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1283 if (is_obsolete_flag(stripped_argname, &since)) {
1284 char version[256];
1285 since.to_string(version, sizeof(version));
1286 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1287 return true;
1288 }
1289 #ifndef PRODUCT
1290 else {
1291 const char* replacement;
1292 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1293 log_warning(arguments)("%s has been removed. Please use %s instead.",
1294 stripped_argname,
1295 replacement);
1296 return false;
1297 }
1298 }
1299 #endif //PRODUCT
1300 }
1301
1302 // For locked flags, report a custom error message if available.
1303 // Otherwise, report the standard unrecognized VM option.
1304 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1305 if (found_flag != NULL) {
1306 char locked_message_buf[BUFLEN];
1307 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1308 if (strlen(locked_message_buf) == 0) {
1309 if (found_flag->is_bool() && !has_plus_minus) {
1310 jio_fprintf(defaultStream::error_stream(),
1311 "Missing +/- setting for VM option '%s'\n", argname);
1312 } else if (!found_flag->is_bool() && has_plus_minus) {
1313 jio_fprintf(defaultStream::error_stream(),
1314 "Unexpected +/- setting in VM option '%s'\n", argname);
1315 } else {
1316 jio_fprintf(defaultStream::error_stream(),
1317 "Improperly specified VM option '%s'\n", argname);
1318 }
1319 } else {
1320 #ifdef PRODUCT
1321 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1322 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1323 if (ignore_unrecognized && mismatched) {
1324 return true;
1325 }
1326 #endif
1327 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1328 }
1329 } else {
1330 if (ignore_unrecognized) {
1331 return true;
1332 }
1333 jio_fprintf(defaultStream::error_stream(),
1334 "Unrecognized VM option '%s'\n", argname);
1335 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1336 if (fuzzy_matched != NULL) {
1337 jio_fprintf(defaultStream::error_stream(),
1338 "Did you mean '%s%s%s'? ",
1339 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1340 fuzzy_matched->_name,
1341 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1342 }
1343 }
1344
1345 // allow for commandline "commenting out" options like -XX:#+Verbose
1346 return arg[0] == '#';
1347 }
1348
1349 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1350 FILE* stream = fopen(file_name, "rb");
1351 if (stream == NULL) {
1352 if (should_exist) {
1353 jio_fprintf(defaultStream::error_stream(),
1354 "Could not open settings file %s\n", file_name);
1355 return false;
1356 } else {
1357 return true;
1358 }
1359 }
1360
1361 char token[1024];
1362 int pos = 0;
1363
1364 bool in_white_space = true;
1365 bool in_comment = false;
1366 bool in_quote = false;
1367 char quote_c = 0;
1368 bool result = true;
1369
1370 int c = getc(stream);
1371 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1372 if (in_white_space) {
1373 if (in_comment) {
1374 if (c == '\n') in_comment = false;
1375 } else {
1376 if (c == '#') in_comment = true;
1377 else if (!isspace(c)) {
1378 in_white_space = false;
1379 token[pos++] = c;
1380 }
1381 }
1382 } else {
1383 if (c == '\n' || (!in_quote && isspace(c))) {
1384 // token ends at newline, or at unquoted whitespace
1385 // this allows a way to include spaces in string-valued options
1386 token[pos] = '\0';
1387 logOption(token);
1388 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1389 build_jvm_flags(token);
1390 pos = 0;
1391 in_white_space = true;
1392 in_quote = false;
1393 } else if (!in_quote && (c == '\'' || c == '"')) {
1394 in_quote = true;
1395 quote_c = c;
1396 } else if (in_quote && (c == quote_c)) {
1397 in_quote = false;
1398 } else {
1399 token[pos++] = c;
1400 }
1401 }
1402 c = getc(stream);
1403 }
1404 if (pos > 0) {
1405 token[pos] = '\0';
1406 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1407 build_jvm_flags(token);
1408 }
1409 fclose(stream);
1410 return result;
1411 }
1412
1413 //=============================================================================================================
1414 // Parsing of properties (-D)
1415
1416 const char* Arguments::get_property(const char* key) {
1417 return PropertyList_get_value(system_properties(), key);
1418 }
1419
1420 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1421 const char* eq = strchr(prop, '=');
1422 const char* key;
1423 const char* value = "";
1424
1425 if (eq == NULL) {
1426 // property doesn't have a value, thus use passed string
1427 key = prop;
1428 } else {
1429 // property have a value, thus extract it and save to the
1430 // allocated string
1431 size_t key_len = eq - prop;
1432 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1433
1434 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1435 key = tmp_key;
1436
1437 value = &prop[key_len + 1];
1438 }
1439
1440 if (strcmp(key, "java.compiler") == 0) {
1441 process_java_compiler_argument(value);
1442 // Record value in Arguments, but let it get passed to Java.
1443 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1444 strcmp(key, "sun.java.launcher.pid") == 0) {
1445 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1446 // private and are processed in process_sun_java_launcher_properties();
1447 // the sun.java.launcher property is passed on to the java application
1448 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1449 // append is true, writable is true, internal is false
1450 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1451 WriteableProperty, ExternalProperty);
1452 } else {
1453 if (strcmp(key, "sun.java.command") == 0) {
1454 char *old_java_command = _java_command;
1455 _java_command = os::strdup_check_oom(value, mtArguments);
1456 if (old_java_command != NULL) {
1457 os::free(old_java_command);
1458 }
1459 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1460 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1461 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1462 // its value without going through the property list or making a Java call.
1463 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1464 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1465 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1466 os::free((void *)old_java_vendor_url_bug);
1467 }
1468 }
1469
1470 // Create new property and add at the end of the list
1471 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1472 }
1473
1474 if (key != prop) {
1475 // SystemProperty copy passed value, thus free previously allocated
1476 // memory
1477 FreeHeap((void *)key);
1478 }
1479
1480 return true;
1481 }
1482
1483 #if INCLUDE_CDS
1484 const char* unsupported_properties[] = { "jdk.module.limitmods",
1485 "jdk.module.upgrade.path",
1486 "jdk.module.patch.0" };
1487 const char* unsupported_options[] = { "--limit-modules",
1488 "--upgrade-module-path",
1489 "--patch-module"
1490 };
1491 void Arguments::check_unsupported_dumping_properties() {
1492 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1493 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1494 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1495 SystemProperty* sp = system_properties();
1496 while (sp != NULL) {
1497 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1498 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1499 vm_exit_during_initialization(
1500 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1501 }
1502 }
1503 sp = sp->next();
1504 }
1505
1506 // Check for an exploded module build in use with -Xshare:dump.
1507 if (!has_jimage()) {
1508 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1509 }
1510 }
1511
1512 bool Arguments::check_unsupported_cds_runtime_properties() {
1513 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1514 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1515 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1516 if (get_property(unsupported_properties[i]) != NULL) {
1517 if (RequireSharedSpaces) {
1518 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1519 }
1520 return true;
1521 }
1522 }
1523 return false;
1524 }
1525 #endif
1526
1527 //===========================================================================================================
1528 // Setting int/mixed/comp mode flags
1529
1530 void Arguments::set_mode_flags(Mode mode) {
1531 // Set up default values for all flags.
1532 // If you add a flag to any of the branches below,
1533 // add a default value for it here.
1534 set_java_compiler(false);
1535 _mode = mode;
1536
1537 // Ensure Agent_OnLoad has the correct initial values.
1538 // This may not be the final mode; mode may change later in onload phase.
1539 PropertyList_unique_add(&_system_properties, "java.vm.info",
1540 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1541
1542 UseInterpreter = true;
1543 UseCompiler = true;
1544 UseLoopCounter = true;
1545
1546 // Default values may be platform/compiler dependent -
1547 // use the saved values
1548 ClipInlining = Arguments::_ClipInlining;
1549 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1550 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1551 BackgroundCompilation = Arguments::_BackgroundCompilation;
1552 if (TieredCompilation) {
1553 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1554 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1555 }
1556 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1557 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1558 }
1559 }
1560
1561 // Change from defaults based on mode
1562 switch (mode) {
1563 default:
1564 ShouldNotReachHere();
1565 break;
1566 case _int:
1567 UseCompiler = false;
1568 UseLoopCounter = false;
1569 AlwaysCompileLoopMethods = false;
1570 UseOnStackReplacement = false;
1571 break;
1572 case _mixed:
1573 // same as default
1574 break;
1575 case _comp:
1576 UseInterpreter = false;
1577 BackgroundCompilation = false;
1578 ClipInlining = false;
1579 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1580 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1581 // compile a level 4 (C2) and then continue executing it.
1582 if (TieredCompilation) {
1583 Tier3InvokeNotifyFreqLog = 0;
1584 Tier4InvocationThreshold = 0;
1585 }
1586 break;
1587 }
1588 }
1589
1590 // Conflict: required to use shared spaces (-Xshare:on), but
1591 // incompatible command line options were chosen.
1592 static void no_shared_spaces(const char* message) {
1593 if (RequireSharedSpaces) {
1594 jio_fprintf(defaultStream::error_stream(),
1595 "Class data sharing is inconsistent with other specified options.\n");
1596 vm_exit_during_initialization("Unable to use shared archive", message);
1597 } else {
1598 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1599 }
1600 }
1601
1602 void set_object_alignment() {
1603 // Object alignment.
1604 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1605 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1606 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1607 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1608 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1609 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1610
1611 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1612 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1613
1614 // Oop encoding heap max
1615 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1616
1617 if (SurvivorAlignmentInBytes == 0) {
1618 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1619 }
1620 }
1621
1622 size_t Arguments::max_heap_for_compressed_oops() {
1623 // Avoid sign flip.
1624 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1625 // We need to fit both the NULL page and the heap into the memory budget, while
1626 // keeping alignment constraints of the heap. To guarantee the latter, as the
1627 // NULL page is located before the heap, we pad the NULL page to the conservative
1628 // maximum alignment that the GC may ever impose upon the heap.
1629 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1630 _conservative_max_heap_alignment);
1631
1632 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1633 NOT_LP64(ShouldNotReachHere(); return 0);
1634 }
1635
1636 void Arguments::set_use_compressed_oops() {
1637 #ifndef ZERO
1638 #ifdef _LP64
1639 // MaxHeapSize is not set up properly at this point, but
1640 // the only value that can override MaxHeapSize if we are
1641 // to use UseCompressedOops is InitialHeapSize.
1642 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1643
1644 if (max_heap_size <= max_heap_for_compressed_oops()) {
1645 #if !defined(COMPILER1) || defined(TIERED)
1646 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1647 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1648 }
1649 #endif
1650 } else {
1651 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1652 warning("Max heap size too large for Compressed Oops");
1653 FLAG_SET_DEFAULT(UseCompressedOops, false);
1654 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1655 }
1656 }
1657 #endif // _LP64
1658 #endif // ZERO
1659 }
1660
1661
1662 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1663 // set_use_compressed_oops().
1664 void Arguments::set_use_compressed_klass_ptrs() {
1665 #ifndef ZERO
1666 #ifdef _LP64
1667 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1668 if (!UseCompressedOops) {
1669 if (UseCompressedClassPointers) {
1670 warning("UseCompressedClassPointers requires UseCompressedOops");
1671 }
1672 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1673 } else {
1674 // Turn on UseCompressedClassPointers too
1675 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1676 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1677 }
1678 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1679 if (UseCompressedClassPointers) {
1680 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1681 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1682 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1683 }
1684 }
1685 }
1686 #endif // _LP64
1687 #endif // !ZERO
1688 }
1689
1690 void Arguments::set_conservative_max_heap_alignment() {
1691 // The conservative maximum required alignment for the heap is the maximum of
1692 // the alignments imposed by several sources: any requirements from the heap
1693 // itself, the collector policy and the maximum page size we may run the VM
1694 // with.
1695 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1696 _conservative_max_heap_alignment = MAX4(heap_alignment,
1697 (size_t)os::vm_allocation_granularity(),
1698 os::max_page_size(),
1699 CollectorPolicy::compute_heap_alignment());
1700 }
1701
1702 jint Arguments::set_ergonomics_flags() {
1703 GCConfig::initialize();
1704
1705 set_conservative_max_heap_alignment();
1706
1707 #ifndef ZERO
1708 #ifdef _LP64
1709 set_use_compressed_oops();
1710
1711 // set_use_compressed_klass_ptrs() must be called after calling
1712 // set_use_compressed_oops().
1713 set_use_compressed_klass_ptrs();
1714
1715 // Also checks that certain machines are slower with compressed oops
1716 // in vm_version initialization code.
1717 #endif // _LP64
1718 #endif // !ZERO
1719
1720 return JNI_OK;
1721 }
1722
1723 julong Arguments::limit_by_allocatable_memory(julong limit) {
1724 julong max_allocatable;
1725 julong result = limit;
1726 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1727 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1728 }
1729 return result;
1730 }
1731
1732 // Use static initialization to get the default before parsing
1733 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1734
1735 void Arguments::set_heap_size() {
1736 julong phys_mem =
1737 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1738 : (julong)MaxRAM;
1739
1740 // Convert deprecated flags
1741 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1742 !FLAG_IS_DEFAULT(MaxRAMFraction))
1743 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1744
1745 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1746 !FLAG_IS_DEFAULT(MinRAMFraction))
1747 MinRAMPercentage = 100.0 / MinRAMFraction;
1748
1749 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1750 !FLAG_IS_DEFAULT(InitialRAMFraction))
1751 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1752
1753 // If the maximum heap size has not been set with -Xmx,
1754 // then set it as fraction of the size of physical memory,
1755 // respecting the maximum and minimum sizes of the heap.
1756 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1757 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1758 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1759 if (reasonable_min < MaxHeapSize) {
1760 // Small physical memory, so use a minimum fraction of it for the heap
1761 reasonable_max = reasonable_min;
1762 } else {
1763 // Not-small physical memory, so require a heap at least
1764 // as large as MaxHeapSize
1765 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1766 }
1767
1768 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1769 // Limit the heap size to ErgoHeapSizeLimit
1770 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1771 }
1772 if (UseCompressedOops) {
1773 // Limit the heap size to the maximum possible when using compressed oops
1774 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1775
1776 // HeapBaseMinAddress can be greater than default but not less than.
1777 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1778 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1779 // matches compressed oops printing flags
1780 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1781 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1782 DefaultHeapBaseMinAddress,
1783 DefaultHeapBaseMinAddress/G,
1784 HeapBaseMinAddress);
1785 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1786 }
1787 }
1788
1789 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1790 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1791 // but it should be not less than default MaxHeapSize.
1792 max_coop_heap -= HeapBaseMinAddress;
1793 }
1794 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1795 }
1796 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1797
1798 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1799 // An initial heap size was specified on the command line,
1800 // so be sure that the maximum size is consistent. Done
1801 // after call to limit_by_allocatable_memory because that
1802 // method might reduce the allocation size.
1803 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1804 }
1805
1806 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1807 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1808 }
1809
1810 // If the minimum or initial heap_size have not been set or requested to be set
1811 // ergonomically, set them accordingly.
1812 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1813 julong reasonable_minimum = (julong)(OldSize + NewSize);
1814
1815 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1816
1817 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1818
1819 if (InitialHeapSize == 0) {
1820 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1821
1822 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1823 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1824
1825 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1826
1827 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1828 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1829 }
1830 // If the minimum heap size has not been set (via -Xms),
1831 // synchronize with InitialHeapSize to avoid errors with the default value.
1832 if (min_heap_size() == 0) {
1833 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1834 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1835 }
1836 }
1837 }
1838
1839 // This option inspects the machine and attempts to set various
1840 // parameters to be optimal for long-running, memory allocation
1841 // intensive jobs. It is intended for machines with large
1842 // amounts of cpu and memory.
1843 jint Arguments::set_aggressive_heap_flags() {
1844 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1845 // VM, but we may not be able to represent the total physical memory
1846 // available (like having 8gb of memory on a box but using a 32bit VM).
1847 // Thus, we need to make sure we're using a julong for intermediate
1848 // calculations.
1849 julong initHeapSize;
1850 julong total_memory = os::physical_memory();
1851
1852 if (total_memory < (julong) 256 * M) {
1853 jio_fprintf(defaultStream::error_stream(),
1854 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1855 vm_exit(1);
1856 }
1857
1858 // The heap size is half of available memory, or (at most)
1859 // all of possible memory less 160mb (leaving room for the OS
1860 // when using ISM). This is the maximum; because adaptive sizing
1861 // is turned on below, the actual space used may be smaller.
1862
1863 initHeapSize = MIN2(total_memory / (julong) 2,
1864 total_memory - (julong) 160 * M);
1865
1866 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1867
1868 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1869 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1870 return JNI_EINVAL;
1871 }
1872 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1873 return JNI_EINVAL;
1874 }
1875 // Currently the minimum size and the initial heap sizes are the same.
1876 set_min_heap_size(initHeapSize);
1877 }
1878 if (FLAG_IS_DEFAULT(NewSize)) {
1879 // Make the young generation 3/8ths of the total heap.
1880 if (FLAG_SET_CMDLINE(size_t, NewSize,
1881 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1882 return JNI_EINVAL;
1883 }
1884 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1885 return JNI_EINVAL;
1886 }
1887 }
1888
1889 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1890 FLAG_SET_DEFAULT(UseLargePages, true);
1891 #endif
1892
1893 // Increase some data structure sizes for efficiency
1894 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1895 return JNI_EINVAL;
1896 }
1897 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
1898 return JNI_EINVAL;
1899 }
1900 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1901 return JNI_EINVAL;
1902 }
1903
1904 // See the OldPLABSize comment below, but replace 'after promotion'
1905 // with 'after copying'. YoungPLABSize is the size of the survivor
1906 // space per-gc-thread buffers. The default is 4kw.
1907 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1908 return JNI_EINVAL;
1909 }
1910
1911 // OldPLABSize is the size of the buffers in the old gen that
1912 // UseParallelGC uses to promote live data that doesn't fit in the
1913 // survivor spaces. At any given time, there's one for each gc thread.
1914 // The default size is 1kw. These buffers are rarely used, since the
1915 // survivor spaces are usually big enough. For specjbb, however, there
1916 // are occasions when there's lots of live data in the young gen
1917 // and we end up promoting some of it. We don't have a definite
1918 // explanation for why bumping OldPLABSize helps, but the theory
1919 // is that a bigger PLAB results in retaining something like the
1920 // original allocation order after promotion, which improves mutator
1921 // locality. A minor effect may be that larger PLABs reduce the
1922 // number of PLAB allocation events during gc. The value of 8kw
1923 // was arrived at by experimenting with specjbb.
1924 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1925 return JNI_EINVAL;
1926 }
1927
1928 // Enable parallel GC and adaptive generation sizing
1929 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
1930 return JNI_EINVAL;
1931 }
1932
1933 // Encourage steady state memory management
1934 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1935 return JNI_EINVAL;
1936 }
1937
1938 // This appears to improve mutator locality
1939 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1940 return JNI_EINVAL;
1941 }
1942
1943 // Get around early Solaris scheduling bug
1944 // (affinity vs other jobs on system)
1945 // but disallow DR and offlining (5008695).
1946 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1947 return JNI_EINVAL;
1948 }
1949
1950 return JNI_OK;
1951 }
1952
1953 // This must be called after ergonomics.
1954 void Arguments::set_bytecode_flags() {
1955 if (!RewriteBytecodes) {
1956 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1957 }
1958 }
1959
1960 // Aggressive optimization flags -XX:+AggressiveOpts
1961 jint Arguments::set_aggressive_opts_flags() {
1962 #ifdef COMPILER2
1963 if (AggressiveUnboxing) {
1964 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1965 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1966 } else if (!EliminateAutoBox) {
1967 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1968 AggressiveUnboxing = false;
1969 }
1970 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1971 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1972 } else if (!DoEscapeAnalysis) {
1973 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1974 AggressiveUnboxing = false;
1975 }
1976 }
1977 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1978 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1979 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1980 }
1981 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1982 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1983 }
1984
1985 // Feed the cache size setting into the JDK
1986 char buffer[1024];
1987 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1988 if (!add_property(buffer)) {
1989 return JNI_ENOMEM;
1990 }
1991 }
1992 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1993 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1994 }
1995 #endif
1996
1997 if (AggressiveOpts) {
1998 // Sample flag setting code
1999 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2000 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2001 // }
2002 }
2003
2004 return JNI_OK;
2005 }
2006
2007 //===========================================================================================================
2008 // Parsing of java.compiler property
2009
2010 void Arguments::process_java_compiler_argument(const char* arg) {
2011 // For backwards compatibility, Djava.compiler=NONE or ""
2012 // causes us to switch to -Xint mode UNLESS -Xdebug
2013 // is also specified.
2014 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2015 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2016 }
2017 }
2018
2019 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2020 _sun_java_launcher = os::strdup_check_oom(launcher);
2021 }
2022
2023 bool Arguments::created_by_java_launcher() {
2024 assert(_sun_java_launcher != NULL, "property must have value");
2025 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2026 }
2027
2028 bool Arguments::sun_java_launcher_is_altjvm() {
2029 return _sun_java_launcher_is_altjvm;
2030 }
2031
2032 //===========================================================================================================
2033 // Parsing of main arguments
2034
2035 unsigned int addreads_count = 0;
2036 unsigned int addexports_count = 0;
2037 unsigned int addopens_count = 0;
2038 unsigned int addmods_count = 0;
2039 unsigned int patch_mod_count = 0;
2040
2041 // Check the consistency of vm_init_args
2042 bool Arguments::check_vm_args_consistency() {
2043 // Method for adding checks for flag consistency.
2044 // The intent is to warn the user of all possible conflicts,
2045 // before returning an error.
2046 // Note: Needs platform-dependent factoring.
2047 bool status = true;
2048
2049 if (TLABRefillWasteFraction == 0) {
2050 jio_fprintf(defaultStream::error_stream(),
2051 "TLABRefillWasteFraction should be a denominator, "
2052 "not " SIZE_FORMAT "\n",
2053 TLABRefillWasteFraction);
2054 status = false;
2055 }
2056
2057 if (PrintNMTStatistics) {
2058 #if INCLUDE_NMT
2059 if (MemTracker::tracking_level() == NMT_off) {
2060 #endif // INCLUDE_NMT
2061 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2062 PrintNMTStatistics = false;
2063 #if INCLUDE_NMT
2064 }
2065 #endif
2066 }
2067
2068 status = CompilerConfig::check_args_consistency(status);
2069 #if INCLUDE_JVMCI
2070 if (status && EnableJVMCI) {
2071 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2072 AddProperty, UnwriteableProperty, InternalProperty);
2073 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2074 return false;
2075 }
2076 }
2077 #endif
2078
2079 #ifndef SUPPORT_RESERVED_STACK_AREA
2080 if (StackReservedPages != 0) {
2081 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2082 warning("Reserved Stack Area not supported on this platform");
2083 }
2084 #endif
2085
2086 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2087 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2088 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2089 }
2090 }
2091 return status;
2092 }
2093
2094 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2095 const char* option_type) {
2096 if (ignore) return false;
2097
2098 const char* spacer = " ";
2099 if (option_type == NULL) {
2100 option_type = ++spacer; // Set both to the empty string.
2101 }
2102
2103 if (os::obsolete_option(option)) {
2104 jio_fprintf(defaultStream::error_stream(),
2105 "Obsolete %s%soption: %s\n", option_type, spacer,
2106 option->optionString);
2107 return false;
2108 } else {
2109 jio_fprintf(defaultStream::error_stream(),
2110 "Unrecognized %s%soption: %s\n", option_type, spacer,
2111 option->optionString);
2112 return true;
2113 }
2114 }
2115
2116 static const char* user_assertion_options[] = {
2117 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2118 };
2119
2120 static const char* system_assertion_options[] = {
2121 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2122 };
2123
2124 bool Arguments::parse_uintx(const char* value,
2125 uintx* uintx_arg,
2126 uintx min_size) {
2127
2128 // Check the sign first since atojulong() parses only unsigned values.
2129 bool value_is_positive = !(*value == '-');
2130
2131 if (value_is_positive) {
2132 julong n;
2133 bool good_return = atojulong(value, &n);
2134 if (good_return) {
2135 bool above_minimum = n >= min_size;
2136 bool value_is_too_large = n > max_uintx;
2137
2138 if (above_minimum && !value_is_too_large) {
2139 *uintx_arg = n;
2140 return true;
2141 }
2142 }
2143 }
2144 return false;
2145 }
2146
2147 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2148 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2149 char* property = AllocateHeap(prop_len, mtArguments);
2150 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2151 if (ret < 0 || ret >= (int)prop_len) {
2152 FreeHeap(property);
2153 return false;
2154 }
2155 bool added = add_property(property, UnwriteableProperty, internal);
2156 FreeHeap(property);
2157 return added;
2158 }
2159
2160 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2161 const unsigned int props_count_limit = 1000;
2162 const int max_digits = 3;
2163 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2164
2165 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2166 if (count < props_count_limit) {
2167 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2168 char* property = AllocateHeap(prop_len, mtArguments);
2169 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2170 if (ret < 0 || ret >= (int)prop_len) {
2171 FreeHeap(property);
2172 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2173 return false;
2174 }
2175 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2176 FreeHeap(property);
2177 return added;
2178 }
2179
2180 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2181 return false;
2182 }
2183
2184 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2185 julong* long_arg,
2186 julong min_size,
2187 julong max_size) {
2188 if (!atojulong(s, long_arg)) return arg_unreadable;
2189 return check_memory_size(*long_arg, min_size, max_size);
2190 }
2191
2192 // Parse JavaVMInitArgs structure
2193
2194 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2195 const JavaVMInitArgs *java_options_args,
2196 const JavaVMInitArgs *cmd_line_args) {
2197 bool patch_mod_javabase = false;
2198
2199 // Save default settings for some mode flags
2200 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2201 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2202 Arguments::_ClipInlining = ClipInlining;
2203 Arguments::_BackgroundCompilation = BackgroundCompilation;
2204 if (TieredCompilation) {
2205 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2206 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2207 }
2208
2209 // Setup flags for mixed which is the default
2210 set_mode_flags(_mixed);
2211
2212 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2213 // variable (if present).
2214 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2215 if (result != JNI_OK) {
2216 return result;
2217 }
2218
2219 // Parse args structure generated from the command line flags.
2220 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2221 if (result != JNI_OK) {
2222 return result;
2223 }
2224
2225 // Parse args structure generated from the _JAVA_OPTIONS environment
2226 // variable (if present) (mimics classic VM)
2227 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2228 if (result != JNI_OK) {
2229 return result;
2230 }
2231
2232 // We need to ensure processor and memory resources have been properly
2233 // configured - which may rely on arguments we just processed - before
2234 // doing the final argument processing. Any argument processing that
2235 // needs to know about processor and memory resources must occur after
2236 // this point.
2237
2238 os::init_container_support();
2239
2240 // Do final processing now that all arguments have been parsed
2241 result = finalize_vm_init_args(patch_mod_javabase);
2242 if (result != JNI_OK) {
2243 return result;
2244 }
2245
2246 return JNI_OK;
2247 }
2248
2249 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2250 // represents a valid JDWP agent. is_path==true denotes that we
2251 // are dealing with -agentpath (case where name is a path), otherwise with
2252 // -agentlib
2253 bool valid_jdwp_agent(char *name, bool is_path) {
2254 char *_name;
2255 const char *_jdwp = "jdwp";
2256 size_t _len_jdwp, _len_prefix;
2257
2258 if (is_path) {
2259 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2260 return false;
2261 }
2262
2263 _name++; // skip past last path separator
2264 _len_prefix = strlen(JNI_LIB_PREFIX);
2265
2266 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2267 return false;
2268 }
2269
2270 _name += _len_prefix;
2271 _len_jdwp = strlen(_jdwp);
2272
2273 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2274 _name += _len_jdwp;
2275 }
2276 else {
2277 return false;
2278 }
2279
2280 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2281 return false;
2282 }
2283
2284 return true;
2285 }
2286
2287 if (strcmp(name, _jdwp) == 0) {
2288 return true;
2289 }
2290
2291 return false;
2292 }
2293
2294 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2295 // --patch-module=<module>=<file>(<pathsep><file>)*
2296 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2297 // Find the equal sign between the module name and the path specification
2298 const char* module_equal = strchr(patch_mod_tail, '=');
2299 if (module_equal == NULL) {
2300 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2301 return JNI_ERR;
2302 } else {
2303 // Pick out the module name
2304 size_t module_len = module_equal - patch_mod_tail;
2305 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2306 if (module_name != NULL) {
2307 memcpy(module_name, patch_mod_tail, module_len);
2308 *(module_name + module_len) = '\0';
2309 // The path piece begins one past the module_equal sign
2310 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2311 FREE_C_HEAP_ARRAY(char, module_name);
2312 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2313 return JNI_ENOMEM;
2314 }
2315 } else {
2316 return JNI_ENOMEM;
2317 }
2318 }
2319 return JNI_OK;
2320 }
2321
2322 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2323 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2324 // The min and max sizes match the values in globals.hpp, but scaled
2325 // with K. The values have been chosen so that alignment with page
2326 // size doesn't change the max value, which makes the conversions
2327 // back and forth between Xss value and ThreadStackSize value easier.
2328 // The values have also been chosen to fit inside a 32-bit signed type.
2329 const julong min_ThreadStackSize = 0;
2330 const julong max_ThreadStackSize = 1 * M;
2331
2332 const julong min_size = min_ThreadStackSize * K;
2333 const julong max_size = max_ThreadStackSize * K;
2334
2335 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2336
2337 julong size = 0;
2338 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2339 if (errcode != arg_in_range) {
2340 bool silent = (option == NULL); // Allow testing to silence error messages
2341 if (!silent) {
2342 jio_fprintf(defaultStream::error_stream(),
2343 "Invalid thread stack size: %s\n", option->optionString);
2344 describe_range_error(errcode);
2345 }
2346 return JNI_EINVAL;
2347 }
2348
2349 // Internally track ThreadStackSize in units of 1024 bytes.
2350 const julong size_aligned = align_up(size, K);
2351 assert(size <= size_aligned,
2352 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2353 size, size_aligned);
2354
2355 const julong size_in_K = size_aligned / K;
2356 assert(size_in_K < (julong)max_intx,
2357 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2358 size_in_K);
2359
2360 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2361 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2362 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2363 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2364 max_expanded, size_in_K);
2365
2366 *out_ThreadStackSize = (intx)size_in_K;
2367
2368 return JNI_OK;
2369 }
2370
2371 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2372 // For match_option to return remaining or value part of option string
2373 const char* tail;
2374
2375 // iterate over arguments
2376 for (int index = 0; index < args->nOptions; index++) {
2377 bool is_absolute_path = false; // for -agentpath vs -agentlib
2378
2379 const JavaVMOption* option = args->options + index;
2380
2381 if (!match_option(option, "-Djava.class.path", &tail) &&
2382 !match_option(option, "-Dsun.java.command", &tail) &&
2383 !match_option(option, "-Dsun.java.launcher", &tail)) {
2384
2385 // add all jvm options to the jvm_args string. This string
2386 // is used later to set the java.vm.args PerfData string constant.
2387 // the -Djava.class.path and the -Dsun.java.command options are
2388 // omitted from jvm_args string as each have their own PerfData
2389 // string constant object.
2390 build_jvm_args(option->optionString);
2391 }
2392
2393 // -verbose:[class/module/gc/jni]
2394 if (match_option(option, "-verbose", &tail)) {
2395 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2396 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2397 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2398 } else if (!strcmp(tail, ":module")) {
2399 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2400 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2401 } else if (!strcmp(tail, ":gc")) {
2402 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2403 } else if (!strcmp(tail, ":jni")) {
2404 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2405 return JNI_EINVAL;
2406 }
2407 }
2408 // -da / -ea / -disableassertions / -enableassertions
2409 // These accept an optional class/package name separated by a colon, e.g.,
2410 // -da:java.lang.Thread.
2411 } else if (match_option(option, user_assertion_options, &tail, true)) {
2412 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2413 if (*tail == '\0') {
2414 JavaAssertions::setUserClassDefault(enable);
2415 } else {
2416 assert(*tail == ':', "bogus match by match_option()");
2417 JavaAssertions::addOption(tail + 1, enable);
2418 }
2419 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2420 } else if (match_option(option, system_assertion_options, &tail, false)) {
2421 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2422 JavaAssertions::setSystemClassDefault(enable);
2423 // -bootclasspath:
2424 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2425 jio_fprintf(defaultStream::output_stream(),
2426 "-Xbootclasspath is no longer a supported option.\n");
2427 return JNI_EINVAL;
2428 // -bootclasspath/a:
2429 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2430 Arguments::append_sysclasspath(tail);
2431 // -bootclasspath/p:
2432 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2433 jio_fprintf(defaultStream::output_stream(),
2434 "-Xbootclasspath/p is no longer a supported option.\n");
2435 return JNI_EINVAL;
2436 // -Xrun
2437 } else if (match_option(option, "-Xrun", &tail)) {
2438 if (tail != NULL) {
2439 const char* pos = strchr(tail, ':');
2440 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2441 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2442 jio_snprintf(name, len + 1, "%s", tail);
2443
2444 char *options = NULL;
2445 if(pos != NULL) {
2446 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2447 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2448 }
2449 #if !INCLUDE_JVMTI
2450 if (strcmp(name, "jdwp") == 0) {
2451 jio_fprintf(defaultStream::error_stream(),
2452 "Debugging agents are not supported in this VM\n");
2453 return JNI_ERR;
2454 }
2455 #endif // !INCLUDE_JVMTI
2456 add_init_library(name, options);
2457 }
2458 } else if (match_option(option, "--add-reads=", &tail)) {
2459 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2460 return JNI_ENOMEM;
2461 }
2462 } else if (match_option(option, "--add-exports=", &tail)) {
2463 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2464 return JNI_ENOMEM;
2465 }
2466 } else if (match_option(option, "--add-opens=", &tail)) {
2467 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2468 return JNI_ENOMEM;
2469 }
2470 } else if (match_option(option, "--add-modules=", &tail)) {
2471 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2472 return JNI_ENOMEM;
2473 }
2474 } else if (match_option(option, "--limit-modules=", &tail)) {
2475 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2476 return JNI_ENOMEM;
2477 }
2478 } else if (match_option(option, "--module-path=", &tail)) {
2479 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2480 return JNI_ENOMEM;
2481 }
2482 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2483 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2484 return JNI_ENOMEM;
2485 }
2486 } else if (match_option(option, "--patch-module=", &tail)) {
2487 // --patch-module=<module>=<file>(<pathsep><file>)*
2488 int res = process_patch_mod_option(tail, patch_mod_javabase);
2489 if (res != JNI_OK) {
2490 return res;
2491 }
2492 } else if (match_option(option, "--illegal-access=", &tail)) {
2493 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2494 return JNI_ENOMEM;
2495 }
2496 // -agentlib and -agentpath
2497 } else if (match_option(option, "-agentlib:", &tail) ||
2498 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2499 if(tail != NULL) {
2500 const char* pos = strchr(tail, '=');
2501 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2502 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2503 name[len] = '\0';
2504
2505 char *options = NULL;
2506 if(pos != NULL) {
2507 options = os::strdup_check_oom(pos + 1, mtArguments);
2508 }
2509 #if !INCLUDE_JVMTI
2510 if (valid_jdwp_agent(name, is_absolute_path)) {
2511 jio_fprintf(defaultStream::error_stream(),
2512 "Debugging agents are not supported in this VM\n");
2513 return JNI_ERR;
2514 }
2515 #endif // !INCLUDE_JVMTI
2516 add_init_agent(name, options, is_absolute_path);
2517 }
2518 // -javaagent
2519 } else if (match_option(option, "-javaagent:", &tail)) {
2520 #if !INCLUDE_JVMTI
2521 jio_fprintf(defaultStream::error_stream(),
2522 "Instrumentation agents are not supported in this VM\n");
2523 return JNI_ERR;
2524 #else
2525 if (tail != NULL) {
2526 size_t length = strlen(tail) + 1;
2527 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2528 jio_snprintf(options, length, "%s", tail);
2529 add_instrument_agent("instrument", options, false);
2530 // java agents need module java.instrument
2531 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2532 return JNI_ENOMEM;
2533 }
2534 }
2535 #endif // !INCLUDE_JVMTI
2536 // --enable_preview
2537 } else if (match_option(option, "--enable-preview")) {
2538 set_enable_preview();
2539 // -Xnoclassgc
2540 } else if (match_option(option, "-Xnoclassgc")) {
2541 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2542 return JNI_EINVAL;
2543 }
2544 // -Xconcgc
2545 } else if (match_option(option, "-Xconcgc")) {
2546 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2547 return JNI_EINVAL;
2548 }
2549 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2550 // -Xnoconcgc
2551 } else if (match_option(option, "-Xnoconcgc")) {
2552 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2553 return JNI_EINVAL;
2554 }
2555 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2556 // -Xbatch
2557 } else if (match_option(option, "-Xbatch")) {
2558 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2559 return JNI_EINVAL;
2560 }
2561 // -Xmn for compatibility with other JVM vendors
2562 } else if (match_option(option, "-Xmn", &tail)) {
2563 julong long_initial_young_size = 0;
2564 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2565 if (errcode != arg_in_range) {
2566 jio_fprintf(defaultStream::error_stream(),
2567 "Invalid initial young generation size: %s\n", option->optionString);
2568 describe_range_error(errcode);
2569 return JNI_EINVAL;
2570 }
2571 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2572 return JNI_EINVAL;
2573 }
2574 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 // -Xms
2578 } else if (match_option(option, "-Xms", &tail)) {
2579 julong long_initial_heap_size = 0;
2580 // an initial heap size of 0 means automatically determine
2581 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2582 if (errcode != arg_in_range) {
2583 jio_fprintf(defaultStream::error_stream(),
2584 "Invalid initial heap size: %s\n", option->optionString);
2585 describe_range_error(errcode);
2586 return JNI_EINVAL;
2587 }
2588 set_min_heap_size((size_t)long_initial_heap_size);
2589 // Currently the minimum size and the initial heap sizes are the same.
2590 // Can be overridden with -XX:InitialHeapSize.
2591 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2592 return JNI_EINVAL;
2593 }
2594 // -Xmx
2595 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2596 julong long_max_heap_size = 0;
2597 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2598 if (errcode != arg_in_range) {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Invalid maximum heap size: %s\n", option->optionString);
2601 describe_range_error(errcode);
2602 return JNI_EINVAL;
2603 }
2604 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2605 return JNI_EINVAL;
2606 }
2607 // Xmaxf
2608 } else if (match_option(option, "-Xmaxf", &tail)) {
2609 char* err;
2610 int maxf = (int)(strtod(tail, &err) * 100);
2611 if (*err != '\0' || *tail == '\0') {
2612 jio_fprintf(defaultStream::error_stream(),
2613 "Bad max heap free percentage size: %s\n",
2614 option->optionString);
2615 return JNI_EINVAL;
2616 } else {
2617 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2618 return JNI_EINVAL;
2619 }
2620 }
2621 // Xminf
2622 } else if (match_option(option, "-Xminf", &tail)) {
2623 char* err;
2624 int minf = (int)(strtod(tail, &err) * 100);
2625 if (*err != '\0' || *tail == '\0') {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Bad min heap free percentage size: %s\n",
2628 option->optionString);
2629 return JNI_EINVAL;
2630 } else {
2631 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2632 return JNI_EINVAL;
2633 }
2634 }
2635 // -Xss
2636 } else if (match_option(option, "-Xss", &tail)) {
2637 intx value = 0;
2638 jint err = parse_xss(option, tail, &value);
2639 if (err != JNI_OK) {
2640 return err;
2641 }
2642 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2646 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2647 julong long_ReservedCodeCacheSize = 0;
2648
2649 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2650 if (errcode != arg_in_range) {
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Invalid maximum code cache size: %s.\n", option->optionString);
2653 return JNI_EINVAL;
2654 }
2655 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 // -green
2659 } else if (match_option(option, "-green")) {
2660 jio_fprintf(defaultStream::error_stream(),
2661 "Green threads support not available\n");
2662 return JNI_EINVAL;
2663 // -native
2664 } else if (match_option(option, "-native")) {
2665 // HotSpot always uses native threads, ignore silently for compatibility
2666 // -Xrs
2667 } else if (match_option(option, "-Xrs")) {
2668 // Classic/EVM option, new functionality
2669 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 // -Xprof
2673 } else if (match_option(option, "-Xprof")) {
2674 char version[256];
2675 // Obsolete in JDK 10
2676 JDK_Version::jdk(10).to_string(version, sizeof(version));
2677 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2678 // -Xconcurrentio
2679 } else if (match_option(option, "-Xconcurrentio")) {
2680 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != JVMFlag::SUCCESS) {
2681 return JNI_EINVAL;
2682 }
2683 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2687 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != JVMFlag::SUCCESS) {
2688 return JNI_EINVAL;
2689 }
2690 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != JVMFlag::SUCCESS) { // 20Kb per thread added to new generation
2691 return JNI_EINVAL;
2692 }
2693
2694 // -Xinternalversion
2695 } else if (match_option(option, "-Xinternalversion")) {
2696 jio_fprintf(defaultStream::output_stream(), "%s\n",
2697 VM_Version::internal_vm_info_string());
2698 vm_exit(0);
2699 #ifndef PRODUCT
2700 // -Xprintflags
2701 } else if (match_option(option, "-Xprintflags")) {
2702 JVMFlag::printFlags(tty, false);
2703 vm_exit(0);
2704 #endif
2705 // -D
2706 } else if (match_option(option, "-D", &tail)) {
2707 const char* value;
2708 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2709 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2710 // abort if -Djava.endorsed.dirs is set
2711 jio_fprintf(defaultStream::output_stream(),
2712 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2713 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2714 return JNI_EINVAL;
2715 }
2716 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2717 *value != '\0' && strcmp(value, "\"\"") != 0) {
2718 // abort if -Djava.ext.dirs is set
2719 jio_fprintf(defaultStream::output_stream(),
2720 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2721 return JNI_EINVAL;
2722 }
2723 // Check for module related properties. They must be set using the modules
2724 // options. For example: use "--add-modules=java.sql", not
2725 // "-Djdk.module.addmods=java.sql"
2726 if (is_internal_module_property(option->optionString + 2)) {
2727 needs_module_property_warning = true;
2728 continue;
2729 }
2730
2731 if (!add_property(tail)) {
2732 return JNI_ENOMEM;
2733 }
2734 // Out of the box management support
2735 if (match_option(option, "-Dcom.sun.management", &tail)) {
2736 #if INCLUDE_MANAGEMENT
2737 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 // management agent in module jdk.management.agent
2741 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2742 return JNI_ENOMEM;
2743 }
2744 #else
2745 jio_fprintf(defaultStream::output_stream(),
2746 "-Dcom.sun.management is not supported in this VM.\n");
2747 return JNI_ERR;
2748 #endif
2749 }
2750 // -Xint
2751 } else if (match_option(option, "-Xint")) {
2752 set_mode_flags(_int);
2753 // -Xmixed
2754 } else if (match_option(option, "-Xmixed")) {
2755 set_mode_flags(_mixed);
2756 // -Xcomp
2757 } else if (match_option(option, "-Xcomp")) {
2758 // for testing the compiler; turn off all flags that inhibit compilation
2759 set_mode_flags(_comp);
2760 // -Xshare:dump
2761 } else if (match_option(option, "-Xshare:dump")) {
2762 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 set_mode_flags(_int); // Prevent compilation, which creates objects
2766 // -Xshare:on
2767 } else if (match_option(option, "-Xshare:on")) {
2768 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 // -Xshare:auto
2775 } else if (match_option(option, "-Xshare:auto")) {
2776 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2780 return JNI_EINVAL;
2781 }
2782 // -Xshare:off
2783 } else if (match_option(option, "-Xshare:off")) {
2784 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2785 return JNI_EINVAL;
2786 }
2787 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 // -Xverify
2791 } else if (match_option(option, "-Xverify", &tail)) {
2792 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2793 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2794 return JNI_EINVAL;
2795 }
2796 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2797 return JNI_EINVAL;
2798 }
2799 } else if (strcmp(tail, ":remote") == 0) {
2800 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2804 return JNI_EINVAL;
2805 }
2806 } else if (strcmp(tail, ":none") == 0) {
2807 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2808 return JNI_EINVAL;
2809 }
2810 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2811 return JNI_EINVAL;
2812 }
2813 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2814 return JNI_EINVAL;
2815 }
2816 // -Xdebug
2817 } else if (match_option(option, "-Xdebug")) {
2818 // note this flag has been used, then ignore
2819 set_xdebug_mode(true);
2820 // -Xnoagent
2821 } else if (match_option(option, "-Xnoagent")) {
2822 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2823 } else if (match_option(option, "-Xloggc:", &tail)) {
2824 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2825 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2826 _gc_log_filename = os::strdup_check_oom(tail);
2827 } else if (match_option(option, "-Xlog", &tail)) {
2828 bool ret = false;
2829 if (strcmp(tail, ":help") == 0) {
2830 fileStream stream(defaultStream::output_stream());
2831 LogConfiguration::print_command_line_help(&stream);
2832 vm_exit(0);
2833 } else if (strcmp(tail, ":disable") == 0) {
2834 LogConfiguration::disable_logging();
2835 ret = true;
2836 } else if (*tail == '\0') {
2837 ret = LogConfiguration::parse_command_line_arguments();
2838 assert(ret, "-Xlog without arguments should never fail to parse");
2839 } else if (*tail == ':') {
2840 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2841 }
2842 if (ret == false) {
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2845 tail);
2846 return JNI_EINVAL;
2847 }
2848 // JNI hooks
2849 } else if (match_option(option, "-Xcheck", &tail)) {
2850 if (!strcmp(tail, ":jni")) {
2851 #if !INCLUDE_JNI_CHECK
2852 warning("JNI CHECKING is not supported in this VM");
2853 #else
2854 CheckJNICalls = true;
2855 #endif // INCLUDE_JNI_CHECK
2856 } else if (is_bad_option(option, args->ignoreUnrecognized,
2857 "check")) {
2858 return JNI_EINVAL;
2859 }
2860 } else if (match_option(option, "vfprintf")) {
2861 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2862 } else if (match_option(option, "exit")) {
2863 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2864 } else if (match_option(option, "abort")) {
2865 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2866 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2867 // and the last option wins.
2868 } else if (match_option(option, "-XX:+NeverTenure")) {
2869 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
2870 return JNI_EINVAL;
2871 }
2872 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2879 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2889 uintx max_tenuring_thresh = 0;
2890 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2891 jio_fprintf(defaultStream::error_stream(),
2892 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2893 return JNI_EINVAL;
2894 }
2895
2896 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899
2900 if (MaxTenuringThreshold == 0) {
2901 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2902 return JNI_EINVAL;
2903 }
2904 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 } else {
2908 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2909 return JNI_EINVAL;
2910 }
2911 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914 }
2915 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2916 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2923 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2930 #if defined(DTRACE_ENABLED)
2931 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 #else // defined(DTRACE_ENABLED)
2944 jio_fprintf(defaultStream::error_stream(),
2945 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2946 return JNI_EINVAL;
2947 #endif // defined(DTRACE_ENABLED)
2948 #ifdef ASSERT
2949 } else if (match_option(option, "-XX:+FullGCALot")) {
2950 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 // disable scavenge before parallel mark-compact
2954 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957 #endif
2958 #if !INCLUDE_MANAGEMENT
2959 } else if (match_option(option, "-XX:+ManagementServer")) {
2960 jio_fprintf(defaultStream::error_stream(),
2961 "ManagementServer is not supported in this VM.\n");
2962 return JNI_ERR;
2963 #endif // INCLUDE_MANAGEMENT
2964 #if INCLUDE_JFR
2965 } else if (match_jfr_option(&option)) {
2966 return JNI_EINVAL;
2967 #endif
2968 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2969 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2970 // already been handled
2971 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2972 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2973 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2974 return JNI_EINVAL;
2975 }
2976 }
2977 // Unknown option
2978 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2979 return JNI_ERR;
2980 }
2981 }
2982
2983 // PrintSharedArchiveAndExit will turn on
2984 // -Xshare:on
2985 // -Xlog:class+path=info
2986 if (PrintSharedArchiveAndExit) {
2987 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2994 }
2995
2996 // Change the default value for flags which have different default values
2997 // when working with older JDKs.
2998 #ifdef LINUX
2999 if (JDK_Version::current().compare_major(6) <= 0 &&
3000 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3001 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3002 }
3003 #endif // LINUX
3004 fix_appclasspath();
3005 return JNI_OK;
3006 }
3007
3008 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3009 // For java.base check for duplicate --patch-module options being specified on the command line.
3010 // This check is only required for java.base, all other duplicate module specifications
3011 // will be checked during module system initialization. The module system initialization
3012 // will throw an ExceptionInInitializerError if this situation occurs.
3013 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3014 if (*patch_mod_javabase) {
3015 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3016 } else {
3017 *patch_mod_javabase = true;
3018 }
3019 }
3020
3021 // Create GrowableArray lazily, only if --patch-module has been specified
3022 if (_patch_mod_prefix == NULL) {
3023 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3024 }
3025
3026 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3027 }
3028
3029 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3030 //
3031 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3032 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3033 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3034 // path is treated as the current directory.
3035 //
3036 // This causes problems with CDS, which requires that all directories specified in the classpath
3037 // must be empty. In most cases, applications do NOT want to load classes from the current
3038 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3039 // scripts compatible with CDS.
3040 void Arguments::fix_appclasspath() {
3041 if (IgnoreEmptyClassPaths) {
3042 const char separator = *os::path_separator();
3043 const char* src = _java_class_path->value();
3044
3045 // skip over all the leading empty paths
3046 while (*src == separator) {
3047 src ++;
3048 }
3049
3050 char* copy = os::strdup_check_oom(src, mtArguments);
3051
3052 // trim all trailing empty paths
3053 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3054 *tail = '\0';
3055 }
3056
3057 char from[3] = {separator, separator, '\0'};
3058 char to [2] = {separator, '\0'};
3059 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3060 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3061 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3062 }
3063
3064 _java_class_path->set_writeable_value(copy);
3065 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3066 }
3067 }
3068
3069 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3070 // check if the default lib/endorsed directory exists; if so, error
3071 char path[JVM_MAXPATHLEN];
3072 const char* fileSep = os::file_separator();
3073 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3074
3075 DIR* dir = os::opendir(path);
3076 if (dir != NULL) {
3077 jio_fprintf(defaultStream::output_stream(),
3078 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3079 "in modular form will be supported via the concept of upgradeable modules.\n");
3080 os::closedir(dir);
3081 return JNI_ERR;
3082 }
3083
3084 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3085 dir = os::opendir(path);
3086 if (dir != NULL) {
3087 jio_fprintf(defaultStream::output_stream(),
3088 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3089 "Use -classpath instead.\n.");
3090 os::closedir(dir);
3091 return JNI_ERR;
3092 }
3093
3094 // This must be done after all arguments have been processed
3095 // and the container support has been initialized since AggressiveHeap
3096 // relies on the amount of total memory available.
3097 if (AggressiveHeap) {
3098 jint result = set_aggressive_heap_flags();
3099 if (result != JNI_OK) {
3100 return result;
3101 }
3102 }
3103
3104 // This must be done after all arguments have been processed.
3105 // java_compiler() true means set to "NONE" or empty.
3106 if (java_compiler() && !xdebug_mode()) {
3107 // For backwards compatibility, we switch to interpreted mode if
3108 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3109 // not specified.
3110 set_mode_flags(_int);
3111 }
3112
3113 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3114 // but like -Xint, leave compilation thresholds unaffected.
3115 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3116 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3117 set_mode_flags(_int);
3118 }
3119
3120 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3121 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3122 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3123 }
3124
3125 #if !COMPILER2_OR_JVMCI
3126 // Don't degrade server performance for footprint
3127 if (FLAG_IS_DEFAULT(UseLargePages) &&
3128 MaxHeapSize < LargePageHeapSizeThreshold) {
3129 // No need for large granularity pages w/small heaps.
3130 // Note that large pages are enabled/disabled for both the
3131 // Java heap and the code cache.
3132 FLAG_SET_DEFAULT(UseLargePages, false);
3133 }
3134
3135 UNSUPPORTED_OPTION(ProfileInterpreter);
3136 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3137 #endif
3138
3139 #ifndef TIERED
3140 // Tiered compilation is undefined.
3141 UNSUPPORTED_OPTION(TieredCompilation);
3142 #endif
3143
3144 if (!check_vm_args_consistency()) {
3145 return JNI_ERR;
3146 }
3147
3148 #if INCLUDE_CDS
3149 if (DumpSharedSpaces) {
3150 // Disable biased locking now as it interferes with the clean up of
3151 // the archived Klasses and Java string objects (at dump time only).
3152 UseBiasedLocking = false;
3153
3154 // Always verify non-system classes during CDS dump
3155 if (!BytecodeVerificationRemote) {
3156 BytecodeVerificationRemote = true;
3157 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3158 }
3159 }
3160 if (UseSharedSpaces && patch_mod_javabase) {
3161 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3162 }
3163 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3164 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3165 }
3166 #endif
3167
3168 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3169 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3170 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3171
3172 return JNI_OK;
3173 }
3174
3175 // Helper class for controlling the lifetime of JavaVMInitArgs
3176 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3177 // deleted on the destruction of the ScopedVMInitArgs object.
3178 class ScopedVMInitArgs : public StackObj {
3179 private:
3180 JavaVMInitArgs _args;
3181 char* _container_name;
3182 bool _is_set;
3183 char* _vm_options_file_arg;
3184
3185 public:
3186 ScopedVMInitArgs(const char *container_name) {
3187 _args.version = JNI_VERSION_1_2;
3188 _args.nOptions = 0;
3189 _args.options = NULL;
3190 _args.ignoreUnrecognized = false;
3191 _container_name = (char *)container_name;
3192 _is_set = false;
3193 _vm_options_file_arg = NULL;
3194 }
3195
3196 // Populates the JavaVMInitArgs object represented by this
3197 // ScopedVMInitArgs object with the arguments in options. The
3198 // allocated memory is deleted by the destructor. If this method
3199 // returns anything other than JNI_OK, then this object is in a
3200 // partially constructed state, and should be abandoned.
3201 jint set_args(GrowableArray<JavaVMOption>* options) {
3202 _is_set = true;
3203 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3204 JavaVMOption, options->length(), mtArguments);
3205 if (options_arr == NULL) {
3206 return JNI_ENOMEM;
3207 }
3208 _args.options = options_arr;
3209
3210 for (int i = 0; i < options->length(); i++) {
3211 options_arr[i] = options->at(i);
3212 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3213 if (options_arr[i].optionString == NULL) {
3214 // Rely on the destructor to do cleanup.
3215 _args.nOptions = i;
3216 return JNI_ENOMEM;
3217 }
3218 }
3219
3220 _args.nOptions = options->length();
3221 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3222 return JNI_OK;
3223 }
3224
3225 JavaVMInitArgs* get() { return &_args; }
3226 char* container_name() { return _container_name; }
3227 bool is_set() { return _is_set; }
3228 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3229 char* vm_options_file_arg() { return _vm_options_file_arg; }
3230
3231 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3232 if (_vm_options_file_arg != NULL) {
3233 os::free(_vm_options_file_arg);
3234 }
3235 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3236 }
3237
3238 ~ScopedVMInitArgs() {
3239 if (_vm_options_file_arg != NULL) {
3240 os::free(_vm_options_file_arg);
3241 }
3242 if (_args.options == NULL) return;
3243 for (int i = 0; i < _args.nOptions; i++) {
3244 os::free(_args.options[i].optionString);
3245 }
3246 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3247 }
3248
3249 // Insert options into this option list, to replace option at
3250 // vm_options_file_pos (-XX:VMOptionsFile)
3251 jint insert(const JavaVMInitArgs* args,
3252 const JavaVMInitArgs* args_to_insert,
3253 const int vm_options_file_pos) {
3254 assert(_args.options == NULL, "shouldn't be set yet");
3255 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3256 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3257
3258 int length = args->nOptions + args_to_insert->nOptions - 1;
3259 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3260 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3261 for (int i = 0; i < args->nOptions; i++) {
3262 if (i == vm_options_file_pos) {
3263 // insert the new options starting at the same place as the
3264 // -XX:VMOptionsFile option
3265 for (int j = 0; j < args_to_insert->nOptions; j++) {
3266 options->push(args_to_insert->options[j]);
3267 }
3268 } else {
3269 options->push(args->options[i]);
3270 }
3271 }
3272 // make into options array
3273 jint result = set_args(options);
3274 delete options;
3275 return result;
3276 }
3277 };
3278
3279 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3280 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3281 }
3282
3283 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3284 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3285 }
3286
3287 jint Arguments::parse_options_environment_variable(const char* name,
3288 ScopedVMInitArgs* vm_args) {
3289 char *buffer = ::getenv(name);
3290
3291 // Don't check this environment variable if user has special privileges
3292 // (e.g. unix su command).
3293 if (buffer == NULL || os::have_special_privileges()) {
3294 return JNI_OK;
3295 }
3296
3297 if ((buffer = os::strdup(buffer)) == NULL) {
3298 return JNI_ENOMEM;
3299 }
3300
3301 jio_fprintf(defaultStream::error_stream(),
3302 "Picked up %s: %s\n", name, buffer);
3303
3304 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3305
3306 os::free(buffer);
3307 return retcode;
3308 }
3309
3310 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3311 // read file into buffer
3312 int fd = ::open(file_name, O_RDONLY);
3313 if (fd < 0) {
3314 jio_fprintf(defaultStream::error_stream(),
3315 "Could not open options file '%s'\n",
3316 file_name);
3317 return JNI_ERR;
3318 }
3319
3320 struct stat stbuf;
3321 int retcode = os::stat(file_name, &stbuf);
3322 if (retcode != 0) {
3323 jio_fprintf(defaultStream::error_stream(),
3324 "Could not stat options file '%s'\n",
3325 file_name);
3326 os::close(fd);
3327 return JNI_ERR;
3328 }
3329
3330 if (stbuf.st_size == 0) {
3331 // tell caller there is no option data and that is ok
3332 os::close(fd);
3333 return JNI_OK;
3334 }
3335
3336 // '+ 1' for NULL termination even with max bytes
3337 size_t bytes_alloc = stbuf.st_size + 1;
3338
3339 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3340 if (NULL == buf) {
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Could not allocate read buffer for options file parse\n");
3343 os::close(fd);
3344 return JNI_ENOMEM;
3345 }
3346
3347 memset(buf, 0, bytes_alloc);
3348
3349 // Fill buffer
3350 // Use ::read() instead of os::read because os::read()
3351 // might do a thread state transition
3352 // and it is too early for that here
3353
3354 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3355 os::close(fd);
3356 if (bytes_read < 0) {
3357 FREE_C_HEAP_ARRAY(char, buf);
3358 jio_fprintf(defaultStream::error_stream(),
3359 "Could not read options file '%s'\n", file_name);
3360 return JNI_ERR;
3361 }
3362
3363 if (bytes_read == 0) {
3364 // tell caller there is no option data and that is ok
3365 FREE_C_HEAP_ARRAY(char, buf);
3366 return JNI_OK;
3367 }
3368
3369 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3370
3371 FREE_C_HEAP_ARRAY(char, buf);
3372 return retcode;
3373 }
3374
3375 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3376 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3377
3378 // some pointers to help with parsing
3379 char *buffer_end = buffer + buf_len;
3380 char *opt_hd = buffer;
3381 char *wrt = buffer;
3382 char *rd = buffer;
3383
3384 // parse all options
3385 while (rd < buffer_end) {
3386 // skip leading white space from the input string
3387 while (rd < buffer_end && isspace(*rd)) {
3388 rd++;
3389 }
3390
3391 if (rd >= buffer_end) {
3392 break;
3393 }
3394
3395 // Remember this is where we found the head of the token.
3396 opt_hd = wrt;
3397
3398 // Tokens are strings of non white space characters separated
3399 // by one or more white spaces.
3400 while (rd < buffer_end && !isspace(*rd)) {
3401 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3402 int quote = *rd; // matching quote to look for
3403 rd++; // don't copy open quote
3404 while (rd < buffer_end && *rd != quote) {
3405 // include everything (even spaces)
3406 // up until the close quote
3407 *wrt++ = *rd++; // copy to option string
3408 }
3409
3410 if (rd < buffer_end) {
3411 rd++; // don't copy close quote
3412 } else {
3413 // did not see closing quote
3414 jio_fprintf(defaultStream::error_stream(),
3415 "Unmatched quote in %s\n", name);
3416 delete options;
3417 return JNI_ERR;
3418 }
3419 } else {
3420 *wrt++ = *rd++; // copy to option string
3421 }
3422 }
3423
3424 // steal a white space character and set it to NULL
3425 *wrt++ = '\0';
3426 // We now have a complete token
3427
3428 JavaVMOption option;
3429 option.optionString = opt_hd;
3430 option.extraInfo = NULL;
3431
3432 options->append(option); // Fill in option
3433
3434 rd++; // Advance to next character
3435 }
3436
3437 // Fill out JavaVMInitArgs structure.
3438 jint status = vm_args->set_args(options);
3439
3440 delete options;
3441 return status;
3442 }
3443
3444 void Arguments::set_shared_spaces_flags() {
3445 if (DumpSharedSpaces) {
3446 if (FailOverToOldVerifier) {
3447 // Don't fall back to the old verifier on verification failure. If a
3448 // class fails verification with the split verifier, it might fail the
3449 // CDS runtime verifier constraint check. In that case, we don't want
3450 // to share the class. We only archive classes that pass the split verifier.
3451 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3452 }
3453
3454 if (RequireSharedSpaces) {
3455 warning("Cannot dump shared archive while using shared archive");
3456 }
3457 UseSharedSpaces = false;
3458 #ifdef _LP64
3459 if (!UseCompressedOops || !UseCompressedClassPointers) {
3460 vm_exit_during_initialization(
3461 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3462 }
3463 } else {
3464 if (!UseCompressedOops || !UseCompressedClassPointers) {
3465 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3466 }
3467 #endif
3468 }
3469 }
3470
3471 // Sharing support
3472 // Construct the path to the archive
3473 static char* get_shared_archive_path() {
3474 char *shared_archive_path;
3475 if (SharedArchiveFile == NULL) {
3476 char jvm_path[JVM_MAXPATHLEN];
3477 os::jvm_path(jvm_path, sizeof(jvm_path));
3478 char *end = strrchr(jvm_path, *os::file_separator());
3479 if (end != NULL) *end = '\0';
3480 size_t jvm_path_len = strlen(jvm_path);
3481 size_t file_sep_len = strlen(os::file_separator());
3482 const size_t len = jvm_path_len + file_sep_len + 20;
3483 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3484 if (shared_archive_path != NULL) {
3485 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3486 jvm_path, os::file_separator());
3487 }
3488 } else {
3489 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3490 }
3491 return shared_archive_path;
3492 }
3493
3494 #ifndef PRODUCT
3495 // Determine whether LogVMOutput should be implicitly turned on.
3496 static bool use_vm_log() {
3497 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3498 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3499 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3500 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3501 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3502 return true;
3503 }
3504
3505 #ifdef COMPILER1
3506 if (PrintC1Statistics) {
3507 return true;
3508 }
3509 #endif // COMPILER1
3510
3511 #ifdef COMPILER2
3512 if (PrintOptoAssembly || PrintOptoStatistics) {
3513 return true;
3514 }
3515 #endif // COMPILER2
3516
3517 return false;
3518 }
3519
3520 #endif // PRODUCT
3521
3522 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3523 for (int index = 0; index < args->nOptions; index++) {
3524 const JavaVMOption* option = args->options + index;
3525 const char* tail;
3526 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3527 return true;
3528 }
3529 }
3530 return false;
3531 }
3532
3533 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3534 const char* vm_options_file,
3535 const int vm_options_file_pos,
3536 ScopedVMInitArgs* vm_options_file_args,
3537 ScopedVMInitArgs* args_out) {
3538 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3539 if (code != JNI_OK) {
3540 return code;
3541 }
3542
3543 if (vm_options_file_args->get()->nOptions < 1) {
3544 return JNI_OK;
3545 }
3546
3547 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3548 jio_fprintf(defaultStream::error_stream(),
3549 "A VM options file may not refer to a VM options file. "
3550 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3551 "options file '%s' in options container '%s' is an error.\n",
3552 vm_options_file_args->vm_options_file_arg(),
3553 vm_options_file_args->container_name());
3554 return JNI_EINVAL;
3555 }
3556
3557 return args_out->insert(args, vm_options_file_args->get(),
3558 vm_options_file_pos);
3559 }
3560
3561 // Expand -XX:VMOptionsFile found in args_in as needed.
3562 // mod_args and args_out parameters may return values as needed.
3563 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3564 ScopedVMInitArgs* mod_args,
3565 JavaVMInitArgs** args_out) {
3566 jint code = match_special_option_and_act(args_in, mod_args);
3567 if (code != JNI_OK) {
3568 return code;
3569 }
3570
3571 if (mod_args->is_set()) {
3572 // args_in contains -XX:VMOptionsFile and mod_args contains the
3573 // original options from args_in along with the options expanded
3574 // from the VMOptionsFile. Return a short-hand to the caller.
3575 *args_out = mod_args->get();
3576 } else {
3577 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3578 }
3579 return JNI_OK;
3580 }
3581
3582 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3583 ScopedVMInitArgs* args_out) {
3584 // Remaining part of option string
3585 const char* tail;
3586 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3587
3588 for (int index = 0; index < args->nOptions; index++) {
3589 const JavaVMOption* option = args->options + index;
3590 if (ArgumentsExt::process_options(option)) {
3591 continue;
3592 }
3593 if (match_option(option, "-XX:Flags=", &tail)) {
3594 Arguments::set_jvm_flags_file(tail);
3595 continue;
3596 }
3597 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3598 if (vm_options_file_args.found_vm_options_file_arg()) {
3599 jio_fprintf(defaultStream::error_stream(),
3600 "The option '%s' is already specified in the options "
3601 "container '%s' so the specification of '%s' in the "
3602 "same options container is an error.\n",
3603 vm_options_file_args.vm_options_file_arg(),
3604 vm_options_file_args.container_name(),
3605 option->optionString);
3606 return JNI_EINVAL;
3607 }
3608 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3609 // If there's a VMOptionsFile, parse that
3610 jint code = insert_vm_options_file(args, tail, index,
3611 &vm_options_file_args, args_out);
3612 if (code != JNI_OK) {
3613 return code;
3614 }
3615 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3616 if (args_out->is_set()) {
3617 // The VMOptions file inserted some options so switch 'args'
3618 // to the new set of options, and continue processing which
3619 // preserves "last option wins" semantics.
3620 args = args_out->get();
3621 // The first option from the VMOptionsFile replaces the
3622 // current option. So we back track to process the
3623 // replacement option.
3624 index--;
3625 }
3626 continue;
3627 }
3628 if (match_option(option, "-XX:+PrintVMOptions")) {
3629 PrintVMOptions = true;
3630 continue;
3631 }
3632 if (match_option(option, "-XX:-PrintVMOptions")) {
3633 PrintVMOptions = false;
3634 continue;
3635 }
3636 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3637 IgnoreUnrecognizedVMOptions = true;
3638 continue;
3639 }
3640 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3641 IgnoreUnrecognizedVMOptions = false;
3642 continue;
3643 }
3644 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3645 JVMFlag::printFlags(tty, false);
3646 vm_exit(0);
3647 }
3648 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3649 #if INCLUDE_NMT
3650 // The launcher did not setup nmt environment variable properly.
3651 if (!MemTracker::check_launcher_nmt_support(tail)) {
3652 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3653 }
3654
3655 // Verify if nmt option is valid.
3656 if (MemTracker::verify_nmt_option()) {
3657 // Late initialization, still in single-threaded mode.
3658 if (MemTracker::tracking_level() >= NMT_summary) {
3659 MemTracker::init();
3660 }
3661 } else {
3662 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3663 }
3664 continue;
3665 #else
3666 jio_fprintf(defaultStream::error_stream(),
3667 "Native Memory Tracking is not supported in this VM\n");
3668 return JNI_ERR;
3669 #endif
3670 }
3671
3672 #ifndef PRODUCT
3673 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3674 JVMFlag::printFlags(tty, true);
3675 vm_exit(0);
3676 }
3677 #endif
3678 }
3679 return JNI_OK;
3680 }
3681
3682 static void print_options(const JavaVMInitArgs *args) {
3683 const char* tail;
3684 for (int index = 0; index < args->nOptions; index++) {
3685 const JavaVMOption *option = args->options + index;
3686 if (match_option(option, "-XX:", &tail)) {
3687 logOption(tail);
3688 }
3689 }
3690 }
3691
3692 bool Arguments::handle_deprecated_print_gc_flags() {
3693 if (PrintGC) {
3694 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3695 }
3696 if (PrintGCDetails) {
3697 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3698 }
3699
3700 if (_gc_log_filename != NULL) {
3701 // -Xloggc was used to specify a filename
3702 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3703
3704 LogTarget(Error, logging) target;
3705 LogStream errstream(target);
3706 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3707 } else if (PrintGC || PrintGCDetails) {
3708 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3709 }
3710 return true;
3711 }
3712
3713 void Arguments::handle_extra_cms_flags(const char* msg) {
3714 SpecialFlag flag;
3715 const char *flag_name = "UseConcMarkSweepGC";
3716 if (lookup_special_flag(flag_name, flag)) {
3717 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3718 warning("%s", msg);
3719 }
3720 }
3721
3722 // Parse entry point called from JNI_CreateJavaVM
3723
3724 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3725 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3726
3727 // Initialize ranges, constraints and writeables
3728 JVMFlagRangeList::init();
3729 JVMFlagConstraintList::init();
3730 JVMFlagWriteableList::init();
3731
3732 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3733 const char* hotspotrc = ".hotspotrc";
3734 bool settings_file_specified = false;
3735 bool needs_hotspotrc_warning = false;
3736 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3737 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3738
3739 // Pointers to current working set of containers
3740 JavaVMInitArgs* cur_cmd_args;
3741 JavaVMInitArgs* cur_java_options_args;
3742 JavaVMInitArgs* cur_java_tool_options_args;
3743
3744 // Containers for modified/expanded options
3745 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3746 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3747 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3748
3749
3750 jint code =
3751 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3752 if (code != JNI_OK) {
3753 return code;
3754 }
3755
3756 code = parse_java_options_environment_variable(&initial_java_options_args);
3757 if (code != JNI_OK) {
3758 return code;
3759 }
3760
3761 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3762 &mod_java_tool_options_args,
3763 &cur_java_tool_options_args);
3764 if (code != JNI_OK) {
3765 return code;
3766 }
3767
3768 code = expand_vm_options_as_needed(initial_cmd_args,
3769 &mod_cmd_args,
3770 &cur_cmd_args);
3771 if (code != JNI_OK) {
3772 return code;
3773 }
3774
3775 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3776 &mod_java_options_args,
3777 &cur_java_options_args);
3778 if (code != JNI_OK) {
3779 return code;
3780 }
3781
3782 const char* flags_file = Arguments::get_jvm_flags_file();
3783 settings_file_specified = (flags_file != NULL);
3784
3785 if (IgnoreUnrecognizedVMOptions) {
3786 cur_cmd_args->ignoreUnrecognized = true;
3787 cur_java_tool_options_args->ignoreUnrecognized = true;
3788 cur_java_options_args->ignoreUnrecognized = true;
3789 }
3790
3791 // Parse specified settings file
3792 if (settings_file_specified) {
3793 if (!process_settings_file(flags_file, true,
3794 cur_cmd_args->ignoreUnrecognized)) {
3795 return JNI_EINVAL;
3796 }
3797 } else {
3798 #ifdef ASSERT
3799 // Parse default .hotspotrc settings file
3800 if (!process_settings_file(".hotspotrc", false,
3801 cur_cmd_args->ignoreUnrecognized)) {
3802 return JNI_EINVAL;
3803 }
3804 #else
3805 struct stat buf;
3806 if (os::stat(hotspotrc, &buf) == 0) {
3807 needs_hotspotrc_warning = true;
3808 }
3809 #endif
3810 }
3811
3812 if (PrintVMOptions) {
3813 print_options(cur_java_tool_options_args);
3814 print_options(cur_cmd_args);
3815 print_options(cur_java_options_args);
3816 }
3817
3818 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3819 jint result = parse_vm_init_args(cur_java_tool_options_args,
3820 cur_java_options_args,
3821 cur_cmd_args);
3822
3823 if (result != JNI_OK) {
3824 return result;
3825 }
3826
3827 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3828 SharedArchivePath = get_shared_archive_path();
3829 if (SharedArchivePath == NULL) {
3830 return JNI_ENOMEM;
3831 }
3832
3833 // Set up VerifySharedSpaces
3834 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3835 VerifySharedSpaces = true;
3836 }
3837
3838 // Delay warning until here so that we've had a chance to process
3839 // the -XX:-PrintWarnings flag
3840 if (needs_hotspotrc_warning) {
3841 warning("%s file is present but has been ignored. "
3842 "Run with -XX:Flags=%s to load the file.",
3843 hotspotrc, hotspotrc);
3844 }
3845
3846 if (needs_module_property_warning) {
3847 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3848 " names that are reserved for internal use.");
3849 }
3850
3851 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3852 UNSUPPORTED_OPTION(UseLargePages);
3853 #endif
3854
3855 ArgumentsExt::report_unsupported_options();
3856
3857 #ifndef PRODUCT
3858 if (TraceBytecodesAt != 0) {
3859 TraceBytecodes = true;
3860 }
3861 if (CountCompiledCalls) {
3862 if (UseCounterDecay) {
3863 warning("UseCounterDecay disabled because CountCalls is set");
3864 UseCounterDecay = false;
3865 }
3866 }
3867 #endif // PRODUCT
3868
3869 if (ScavengeRootsInCode == 0) {
3870 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3871 warning("Forcing ScavengeRootsInCode non-zero");
3872 }
3873 ScavengeRootsInCode = 1;
3874 }
3875
3876 if (!handle_deprecated_print_gc_flags()) {
3877 return JNI_EINVAL;
3878 }
3879
3880 // Set object alignment values.
3881 set_object_alignment();
3882
3883 #if !INCLUDE_CDS
3884 if (DumpSharedSpaces || RequireSharedSpaces) {
3885 jio_fprintf(defaultStream::error_stream(),
3886 "Shared spaces are not supported in this VM\n");
3887 return JNI_ERR;
3888 }
3889 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3890 log_is_enabled(Info, cds)) {
3891 warning("Shared spaces are not supported in this VM");
3892 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3893 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3894 }
3895 no_shared_spaces("CDS Disabled");
3896 #endif // INCLUDE_CDS
3897
3898 return JNI_OK;
3899 }
3900
3901 jint Arguments::apply_ergo() {
3902 // Set flags based on ergonomics.
3903 jint result = set_ergonomics_flags();
3904 if (result != JNI_OK) return result;
3905
3906 // Set heap size based on available physical memory
3907 set_heap_size();
3908
3909 GCConfig::arguments()->initialize();
3910
3911 set_shared_spaces_flags();
3912
3913 // Initialize Metaspace flags and alignments
3914 Metaspace::ergo_initialize();
3915
3916 // Set compiler flags after GC is selected and GC specific
3917 // flags (LoopStripMiningIter) are set.
3918 CompilerConfig::ergo_initialize();
3919
3920 // Set bytecode rewriting flags
3921 set_bytecode_flags();
3922
3923 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3924 jint code = set_aggressive_opts_flags();
3925 if (code != JNI_OK) {
3926 return code;
3927 }
3928
3929 // Turn off biased locking for locking debug mode flags,
3930 // which are subtly different from each other but neither works with
3931 // biased locking
3932 if (UseHeavyMonitors
3933 #ifdef COMPILER1
3934 || !UseFastLocking
3935 #endif // COMPILER1
3936 #if INCLUDE_JVMCI
3937 || !JVMCIUseFastLocking
3938 #endif
3939 ) {
3940 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3941 // flag set to true on command line; warn the user that they
3942 // can't enable biased locking here
3943 warning("Biased Locking is not supported with locking debug flags"
3944 "; ignoring UseBiasedLocking flag." );
3945 }
3946 UseBiasedLocking = false;
3947 }
3948
3949 #ifdef CC_INTERP
3950 // Clear flags not supported on zero.
3951 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3952 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3953 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3954 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3955 #endif // CC_INTERP
3956
3957 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3958 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3959 DebugNonSafepoints = true;
3960 }
3961
3962 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3963 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3964 }
3965
3966 #ifndef PRODUCT
3967 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3968 if (use_vm_log()) {
3969 LogVMOutput = true;
3970 }
3971 }
3972 #endif // PRODUCT
3973
3974 if (PrintCommandLineFlags) {
3975 JVMFlag::printSetFlags(tty);
3976 }
3977
3978 // Apply CPU specific policy for the BiasedLocking
3979 if (UseBiasedLocking) {
3980 if (!VM_Version::use_biased_locking() &&
3981 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3982 UseBiasedLocking = false;
3983 }
3984 }
3985 #ifdef COMPILER2
3986 if (!UseBiasedLocking) {
3987 UseOptoBiasInlining = false;
3988 }
3989 #endif
3990
3991 #if defined(IA32)
3992 // Only server compiler can optimize safepoints well enough.
3993 if (!is_server_compilation_mode_vm()) {
3994 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
3995 }
3996 #endif
3997
3998 // ThreadLocalHandshakesConstraintFunc handles the constraints.
3999 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4000 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4001 } else {
4002 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4003 }
4004
4005 return JNI_OK;
4006 }
4007
4008 jint Arguments::adjust_after_os() {
4009 if (UseNUMA) {
4010 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4011 FLAG_SET_ERGO(bool, UseNUMA, false);
4012 } else if (UseParallelGC || UseParallelOldGC) {
4013 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4014 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4015 }
4016 }
4017 // UseNUMAInterleaving is set to ON for all collectors and
4018 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4019 // such as the parallel collector for Linux and Solaris will
4020 // interleave old gen and survivor spaces on top of NUMA
4021 // allocation policy for the eden space.
4022 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4023 // all platforms and ParallelGC on Windows will interleave all
4024 // of the heap spaces across NUMA nodes.
4025 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4026 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4027 }
4028 }
4029 return JNI_OK;
4030 }
4031
4032 int Arguments::PropertyList_count(SystemProperty* pl) {
4033 int count = 0;
4034 while(pl != NULL) {
4035 count++;
4036 pl = pl->next();
4037 }
4038 return count;
4039 }
4040
4041 // Return the number of readable properties.
4042 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4043 int count = 0;
4044 while(pl != NULL) {
4045 if (pl->is_readable()) {
4046 count++;
4047 }
4048 pl = pl->next();
4049 }
4050 return count;
4051 }
4052
4053 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4054 assert(key != NULL, "just checking");
4055 SystemProperty* prop;
4056 for (prop = pl; prop != NULL; prop = prop->next()) {
4057 if (strcmp(key, prop->key()) == 0) return prop->value();
4058 }
4059 return NULL;
4060 }
4061
4062 // Return the value of the requested property provided that it is a readable property.
4063 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4064 assert(key != NULL, "just checking");
4065 SystemProperty* prop;
4066 // Return the property value if the keys match and the property is not internal or
4067 // it's the special internal property "jdk.boot.class.path.append".
4068 for (prop = pl; prop != NULL; prop = prop->next()) {
4069 if (strcmp(key, prop->key()) == 0) {
4070 if (!prop->internal()) {
4071 return prop->value();
4072 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4073 return prop->value();
4074 } else {
4075 // Property is internal and not jdk.boot.class.path.append so return NULL.
4076 return NULL;
4077 }
4078 }
4079 }
4080 return NULL;
4081 }
4082
4083 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4084 int count = 0;
4085 const char* ret_val = NULL;
4086
4087 while(pl != NULL) {
4088 if(count >= index) {
4089 ret_val = pl->key();
4090 break;
4091 }
4092 count++;
4093 pl = pl->next();
4094 }
4095
4096 return ret_val;
4097 }
4098
4099 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4100 int count = 0;
4101 char* ret_val = NULL;
4102
4103 while(pl != NULL) {
4104 if(count >= index) {
4105 ret_val = pl->value();
4106 break;
4107 }
4108 count++;
4109 pl = pl->next();
4110 }
4111
4112 return ret_val;
4113 }
4114
4115 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4116 SystemProperty* p = *plist;
4117 if (p == NULL) {
4118 *plist = new_p;
4119 } else {
4120 while (p->next() != NULL) {
4121 p = p->next();
4122 }
4123 p->set_next(new_p);
4124 }
4125 }
4126
4127 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4128 bool writeable, bool internal) {
4129 if (plist == NULL)
4130 return;
4131
4132 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4133 PropertyList_add(plist, new_p);
4134 }
4135
4136 void Arguments::PropertyList_add(SystemProperty *element) {
4137 PropertyList_add(&_system_properties, element);
4138 }
4139
4140 // This add maintains unique property key in the list.
4141 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4142 PropertyAppendable append, PropertyWriteable writeable,
4143 PropertyInternal internal) {
4144 if (plist == NULL)
4145 return;
4146
4147 // If property key exist then update with new value.
4148 SystemProperty* prop;
4149 for (prop = *plist; prop != NULL; prop = prop->next()) {
4150 if (strcmp(k, prop->key()) == 0) {
4151 if (append == AppendProperty) {
4152 prop->append_value(v);
4153 } else {
4154 prop->set_value(v);
4155 }
4156 return;
4157 }
4158 }
4159
4160 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4161 }
4162
4163 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4164 // Returns true if all of the source pointed by src has been copied over to
4165 // the destination buffer pointed by buf. Otherwise, returns false.
4166 // Notes:
4167 // 1. If the length (buflen) of the destination buffer excluding the
4168 // NULL terminator character is not long enough for holding the expanded
4169 // pid characters, it also returns false instead of returning the partially
4170 // expanded one.
4171 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4172 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4173 char* buf, size_t buflen) {
4174 const char* p = src;
4175 char* b = buf;
4176 const char* src_end = &src[srclen];
4177 char* buf_end = &buf[buflen - 1];
4178
4179 while (p < src_end && b < buf_end) {
4180 if (*p == '%') {
4181 switch (*(++p)) {
4182 case '%': // "%%" ==> "%"
4183 *b++ = *p++;
4184 break;
4185 case 'p': { // "%p" ==> current process id
4186 // buf_end points to the character before the last character so
4187 // that we could write '\0' to the end of the buffer.
4188 size_t buf_sz = buf_end - b + 1;
4189 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4190
4191 // if jio_snprintf fails or the buffer is not long enough to hold
4192 // the expanded pid, returns false.
4193 if (ret < 0 || ret >= (int)buf_sz) {
4194 return false;
4195 } else {
4196 b += ret;
4197 assert(*b == '\0', "fail in copy_expand_pid");
4198 if (p == src_end && b == buf_end + 1) {
4199 // reach the end of the buffer.
4200 return true;
4201 }
4202 }
4203 p++;
4204 break;
4205 }
4206 default :
4207 *b++ = '%';
4208 }
4209 } else {
4210 *b++ = *p++;
4211 }
4212 }
4213 *b = '\0';
4214 return (p == src_end); // return false if not all of the source was copied
4215 }