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