1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "logging/logStream.hpp"
37 #include "logging/logTag.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/flags/jvmFlagConstraintList.hpp"
45 #include "runtime/flags/jvmFlagWriteableList.hpp"
46 #include "runtime/flags/jvmFlagRangeList.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.inline.hpp"
50 #include "runtime/safepoint.hpp"
51 #include "runtime/safepointMechanism.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/align.hpp"
56 #include "utilities/defaultStream.hpp"
57 #include "utilities/macros.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JFR
60 #include "jfr/jfr.hpp"
61 #endif
62
63 // Note: This is a special bug reporting site for the JVM
64 #ifdef VENDOR_URL_VM_BUG
65 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
66 #else
67 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
68 #endif
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 size_t Arguments::_conservative_max_heap_alignment = 0;
80 Arguments::Mode Arguments::_mode = _mixed;
81 bool Arguments::_java_compiler = false;
82 bool Arguments::_xdebug_mode = false;
83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85 bool Arguments::_sun_java_launcher_is_altjvm = false;
86
87 // These parameters are reset in method parse_vm_init_args()
88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
90 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
91 bool Arguments::_ClipInlining = ClipInlining;
92 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
93 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
94
95 bool Arguments::_enable_preview = false;
96
97 char* Arguments::SharedArchivePath = NULL;
98 char* Arguments::SharedDynamicArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 // These are not set by the JDK's built-in launchers, but they can be set by
104 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
105 // JavaVMOption in jni.h.
106 abort_hook_t Arguments::_abort_hook = NULL;
107 exit_hook_t Arguments::_exit_hook = NULL;
108 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
109
110
111 SystemProperty *Arguments::_sun_boot_library_path = NULL;
112 SystemProperty *Arguments::_java_library_path = NULL;
113 SystemProperty *Arguments::_java_home = NULL;
114 SystemProperty *Arguments::_java_class_path = NULL;
115 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
116 SystemProperty *Arguments::_vm_info = NULL;
117
118 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
119 PathString *Arguments::_system_boot_class_path = NULL;
120 bool Arguments::_has_jimage = false;
121
122 char* Arguments::_ext_dirs = NULL;
123
124 bool PathString::set_value(const char *value) {
125 if (_value != NULL) {
126 FreeHeap(_value);
127 }
128 _value = AllocateHeap(strlen(value)+1, mtArguments);
129 assert(_value != NULL, "Unable to allocate space for new path value");
130 if (_value != NULL) {
131 strcpy(_value, value);
132 } else {
133 // not able to allocate
134 return false;
135 }
136 return true;
137 }
138
139 void PathString::append_value(const char *value) {
140 char *sp;
141 size_t len = 0;
142 if (value != NULL) {
143 len = strlen(value);
144 if (_value != NULL) {
145 len += strlen(_value);
146 }
147 sp = AllocateHeap(len+2, mtArguments);
148 assert(sp != NULL, "Unable to allocate space for new append path value");
149 if (sp != NULL) {
150 if (_value != NULL) {
151 strcpy(sp, _value);
152 strcat(sp, os::path_separator());
153 strcat(sp, value);
154 FreeHeap(_value);
155 } else {
156 strcpy(sp, value);
157 }
158 _value = sp;
159 }
160 }
161 }
162
163 PathString::PathString(const char* value) {
164 if (value == NULL) {
165 _value = NULL;
166 } else {
167 _value = AllocateHeap(strlen(value)+1, mtArguments);
168 strcpy(_value, value);
169 }
170 }
171
172 PathString::~PathString() {
173 if (_value != NULL) {
174 FreeHeap(_value);
175 _value = NULL;
176 }
177 }
178
179 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
180 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
181 size_t len = strlen(module_name) + 1;
182 _module_name = AllocateHeap(len, mtInternal);
183 strncpy(_module_name, module_name, len); // copy the trailing null
184 _path = new PathString(path);
185 }
186
187 ModulePatchPath::~ModulePatchPath() {
188 if (_module_name != NULL) {
189 FreeHeap(_module_name);
190 _module_name = NULL;
191 }
192 if (_path != NULL) {
193 delete _path;
194 _path = NULL;
195 }
196 }
197
198 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
199 if (key == NULL) {
200 _key = NULL;
201 } else {
202 _key = AllocateHeap(strlen(key)+1, mtArguments);
203 strcpy(_key, key);
204 }
205 _next = NULL;
206 _internal = internal;
207 _writeable = writeable;
208 }
209
210 AgentLibrary::AgentLibrary(const char* name, const char* options,
211 bool is_absolute_path, void* os_lib,
212 bool instrument_lib) {
213 _name = AllocateHeap(strlen(name)+1, mtArguments);
214 strcpy(_name, name);
215 if (options == NULL) {
216 _options = NULL;
217 } else {
218 _options = AllocateHeap(strlen(options)+1, mtArguments);
219 strcpy(_options, options);
220 }
221 _is_absolute_path = is_absolute_path;
222 _os_lib = os_lib;
223 _next = NULL;
224 _state = agent_invalid;
225 _is_static_lib = false;
226 _is_instrument_lib = instrument_lib;
227 }
228
229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
230 // part of the option string.
231 static bool match_option(const JavaVMOption *option, const char* name,
232 const char** tail) {
233 size_t len = strlen(name);
234 if (strncmp(option->optionString, name, len) == 0) {
235 *tail = option->optionString + len;
236 return true;
237 } else {
238 return false;
239 }
240 }
241
242 // Check if 'option' matches 'name'. No "tail" is allowed.
243 static bool match_option(const JavaVMOption *option, const char* name) {
244 const char* tail = NULL;
245 bool result = match_option(option, name, &tail);
246 if (tail != NULL && *tail == '\0') {
247 return result;
248 } else {
249 return false;
250 }
251 }
252
253 // Return true if any of the strings in null-terminated array 'names' matches.
254 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
255 // the option must match exactly.
256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
257 bool tail_allowed) {
258 for (/* empty */; *names != NULL; ++names) {
259 if (match_option(option, *names, tail)) {
260 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
261 return true;
262 }
263 }
264 }
265 return false;
266 }
267
268 #if INCLUDE_JFR
269 static bool _has_jfr_option = false; // is using JFR
270
271 // return true on failure
272 static bool match_jfr_option(const JavaVMOption** option) {
273 assert((*option)->optionString != NULL, "invariant");
274 char* tail = NULL;
275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
276 _has_jfr_option = true;
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 _has_jfr_option = true;
280 return Jfr::on_flight_recorder_option(option, tail);
281 }
282 return false;
283 }
284
285 bool Arguments::has_jfr_option() {
286 return _has_jfr_option;
287 }
288 #endif
289
290 static void logOption(const char* opt) {
291 if (PrintVMOptions) {
292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
293 }
294 }
295
296 bool needs_module_property_warning = false;
297
298 #define MODULE_PROPERTY_PREFIX "jdk.module."
299 #define MODULE_PROPERTY_PREFIX_LEN 11
300 #define ADDEXPORTS "addexports"
301 #define ADDEXPORTS_LEN 10
302 #define ADDREADS "addreads"
303 #define ADDREADS_LEN 8
304 #define ADDOPENS "addopens"
305 #define ADDOPENS_LEN 8
306 #define PATCH "patch"
307 #define PATCH_LEN 5
308 #define ADDMODS "addmods"
309 #define ADDMODS_LEN 7
310 #define LIMITMODS "limitmods"
311 #define LIMITMODS_LEN 9
312 #define PATH "path"
313 #define PATH_LEN 4
314 #define UPGRADE_PATH "upgrade.path"
315 #define UPGRADE_PATH_LEN 12
316
317 void Arguments::add_init_library(const char* name, char* options) {
318 _libraryList.add(new AgentLibrary(name, options, false, NULL));
319 }
320
321 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
322 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
323 }
324
325 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
326 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
327 }
328
329 // Late-binding agents not started via arguments
330 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
331 _agentList.add(agentLib);
332 }
333
334 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
335 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
336 return ((strncmp(option, property, len) == 0) &&
337 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
338 }
339
340 // Return true if property starts with "jdk.module." and its ensuing chars match
341 // any of the reserved module properties.
342 // property should be passed without the leading "-D".
343 bool Arguments::is_internal_module_property(const char* property) {
344 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
345 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
346 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
347 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
348 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
349 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
350 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
351 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
352 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
353 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
354 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
355 return true;
356 }
357 }
358 return false;
359 }
360
361 // Process java launcher properties.
362 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
363 // See if sun.java.launcher or sun.java.launcher.is_altjvm 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 }
381 }
382
383 // Initialize system properties key and value.
384 void Arguments::init_system_properties() {
385
386 // Set up _system_boot_class_path which is not a property but
387 // relies heavily on argument processing and the jdk.boot.class.path.append
388 // property. It is used to store the underlying system boot class path.
389 _system_boot_class_path = new PathString(NULL);
390
391 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
392 "Java Virtual Machine Specification", false));
393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
394 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
395 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
396
397 // Initialize the vm.info now, but it will need updating after argument parsing.
398 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
399
400 // Following are JVMTI agent writable properties.
401 // Properties values are set to NULL and they are
402 // os specific they are initialized in os::init_system_properties_values().
403 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
404 _java_library_path = new SystemProperty("java.library.path", NULL, true);
405 _java_home = new SystemProperty("java.home", NULL, true);
406 _java_class_path = new SystemProperty("java.class.path", "", true);
407 // jdk.boot.class.path.append is a non-writeable, internal property.
408 // It can only be set by either:
409 // - -Xbootclasspath/a:
410 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
411 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
412
413 // Add to System Property list.
414 PropertyList_add(&_system_properties, _sun_boot_library_path);
415 PropertyList_add(&_system_properties, _java_library_path);
416 PropertyList_add(&_system_properties, _java_home);
417 PropertyList_add(&_system_properties, _java_class_path);
418 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
419 PropertyList_add(&_system_properties, _vm_info);
420
421 // Set OS specific system properties values
422 os::init_system_properties_values();
423 }
424
425 // Update/Initialize System properties after JDK version number is known
426 void Arguments::init_version_specific_system_properties() {
427 enum { bufsz = 16 };
428 char buffer[bufsz];
429 const char* spec_vendor = "Oracle Corporation";
430 uint32_t spec_version = JDK_Version::current().major_version();
431
432 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
433
434 PropertyList_add(&_system_properties,
435 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
436 PropertyList_add(&_system_properties,
437 new SystemProperty("java.vm.specification.version", buffer, false));
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
440 }
441
442 /*
443 * -XX argument processing:
444 *
445 * -XX arguments are defined in several places, such as:
446 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
447 * -XX arguments are parsed in parse_argument().
448 * -XX argument bounds checking is done in check_vm_args_consistency().
449 *
450 * Over time -XX arguments may change. There are mechanisms to handle common cases:
451 *
452 * ALIASED: An option that is simply another name for another option. This is often
453 * part of the process of deprecating a flag, but not all aliases need
454 * to be deprecated.
455 *
456 * Create an alias for an option by adding the old and new option names to the
457 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
458 *
459 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
460 * support may be removed in the future. Both regular and aliased options may be
461 * deprecated.
462 *
463 * Add a deprecation warning for an option (or alias) by adding an entry in the
464 * "special_jvm_flags" table and setting the "deprecated_in" field.
465 * Often an option "deprecated" in one major release will
466 * be made "obsolete" in the next. In this case the entry should also have its
467 * "obsolete_in" field set.
468 *
469 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
470 * on the command line. A warning is printed to let the user know that option might not
471 * be accepted in the future.
472 *
473 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
474 * table and setting the "obsolete_in" field.
475 *
476 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
477 * to the current JDK version. The system will flatly refuse to admit the existence of
478 * the flag. This allows a flag to die automatically over JDK releases.
479 *
480 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
481 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
482 * - Newly obsolete or expired deprecated options should have their global variable
483 * definitions removed (from globals.hpp, etc) and related implementations removed.
484 *
485 * Recommended approach for removing options:
486 *
487 * To remove options commonly used by customers (e.g. product -XX options), use
488 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
489 *
490 * To remove internal options (e.g. diagnostic, experimental, develop options), use
491 * a 2-step model adding major release numbers to the obsolete and expire columns.
492 *
493 * To change the name of an option, use the alias table as well as a 2-step
494 * model adding major release numbers to the deprecate and expire columns.
495 * Think twice about aliasing commonly used customer options.
496 *
497 * There are times when it is appropriate to leave a future release number as undefined.
498 *
499 * Tests: Aliases should be tested in VMAliasOptions.java.
500 * Deprecated options should be tested in VMDeprecatedOptions.java.
501 */
502
503 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
504 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
505 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
506 // the command-line as usual, but will issue a warning.
507 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
508 // the command-line, while issuing a warning and ignoring the flag value.
509 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
510 // existence of the flag.
511 //
512 // MANUAL CLEANUP ON JDK VERSION UPDATES:
513 // This table ensures that the handling of options will update automatically when the JDK
514 // version is incremented, but the source code needs to be cleanup up manually:
515 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
516 // variable should be removed, as well as users of the variable.
517 // - As "deprecated" options age into "obsolete" options, move the entry into the
518 // "Obsolete Flags" section of the table.
519 // - All expired options should be removed from the table.
520 static SpecialFlag const special_jvm_flags[] = {
521 // -------------- Deprecated Flags --------------
522 // --- Non-alias flags - sorted by obsolete_in then expired_in:
523 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
529 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() },
530 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
531 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
532 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
535 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
536 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
537
538 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
539 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
540 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
541 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
542
543 // -------------- Obsolete Flags - sorted by expired_in --------------
544 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
545 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
546 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
547 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
548 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
549 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
550 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) },
551 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
552 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
553
554 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
555 // These entries will generate build errors. Their purpose is to test the macros.
556 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
557 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
558 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
559 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
560 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
562 #endif
563
564 { NULL, JDK_Version(0), JDK_Version(0) }
565 };
566
567 // Flags that are aliases for other flags.
568 typedef struct {
569 const char* alias_name;
570 const char* real_name;
571 } AliasedFlag;
572
573 static AliasedFlag const aliased_jvm_flags[] = {
574 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
575 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
576 { NULL, NULL}
577 };
578
579 // NOTE: A compatibility request will be necessary for each alias to be removed.
580 static AliasedLoggingFlag const aliased_logging_flags[] = {
581 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
582 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
583 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
584 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
585 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
586 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
587 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
588 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
589 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
590 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
591 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
592 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
593 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
594 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
595 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) },
596 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
597 };
598
599 #ifndef PRODUCT
600 // These options are removed in jdk9. Remove this code for jdk10.
601 static AliasedFlag const removed_develop_logging_flags[] = {
602 { "TraceClassInitialization", "-Xlog:class+init" },
603 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
604 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
605 { "TraceItables", "-Xlog:itables=debug" },
606 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
607 { "TraceSafepoint", "-Xlog:safepoint=debug" },
608 { "TraceStartupTime", "-Xlog:startuptime" },
609 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
610 { "PrintVtables", "-Xlog:vtables=debug" },
611 { "VerboseVerification", "-Xlog:verification" },
612 { NULL, NULL }
613 };
614 #endif //PRODUCT
615
616 // Return true if "v" is less than "other", where "other" may be "undefined".
617 static bool version_less_than(JDK_Version v, JDK_Version other) {
618 assert(!v.is_undefined(), "must be defined");
619 if (!other.is_undefined() && v.compare(other) >= 0) {
620 return false;
621 } else {
622 return true;
623 }
624 }
625
626 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
627 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
628 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
629 flag = special_jvm_flags[i];
630 return true;
631 }
632 }
633 return false;
634 }
635
636 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
637 assert(version != NULL, "Must provide a version buffer");
638 SpecialFlag flag;
639 if (lookup_special_flag(flag_name, flag)) {
640 if (!flag.obsolete_in.is_undefined()) {
641 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
642 *version = flag.obsolete_in;
643 return true;
644 }
645 }
646 }
647 return false;
648 }
649
650 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
651 assert(version != NULL, "Must provide a version buffer");
652 SpecialFlag flag;
653 if (lookup_special_flag(flag_name, flag)) {
654 if (!flag.deprecated_in.is_undefined()) {
655 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
656 version_less_than(JDK_Version::current(), flag.expired_in)) {
657 *version = flag.deprecated_in;
658 return 1;
659 } else {
660 return -1;
661 }
662 }
663 }
664 return 0;
665 }
666
667 #ifndef PRODUCT
668 const char* Arguments::removed_develop_logging_flag_name(const char* name){
669 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
670 const AliasedFlag& flag = removed_develop_logging_flags[i];
671 if (strcmp(flag.alias_name, name) == 0) {
672 return flag.real_name;
673 }
674 }
675 return NULL;
676 }
677 #endif // PRODUCT
678
679 const char* Arguments::real_flag_name(const char *flag_name) {
680 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
681 const AliasedFlag& flag_status = aliased_jvm_flags[i];
682 if (strcmp(flag_status.alias_name, flag_name) == 0) {
683 return flag_status.real_name;
684 }
685 }
686 return flag_name;
687 }
688
689 #ifdef ASSERT
690 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
691 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
692 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
693 return true;
694 }
695 }
696 return false;
697 }
698
699 // Verifies the correctness of the entries in the special_jvm_flags table.
700 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
701 // version being earlier than the deprecation version, then a warning is issued
702 // and verification fails - by returning false. If it is detected that the table
703 // is out of date, with respect to the current version, then a warning is issued
704 // but verification does not fail. This allows the VM to operate when the version
705 // is first updated, without needing to update all the impacted flags at the
706 // same time.
707 static bool verify_special_jvm_flags() {
708 bool success = true;
709 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
710 const SpecialFlag& flag = special_jvm_flags[i];
711 if (lookup_special_flag(flag.name, i)) {
712 warning("Duplicate special flag declaration \"%s\"", flag.name);
713 success = false;
714 }
715 if (flag.deprecated_in.is_undefined() &&
716 flag.obsolete_in.is_undefined()) {
717 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
718 success = false;
719 }
720
721 if (!flag.deprecated_in.is_undefined()) {
722 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
723 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
724 success = false;
725 }
726
727 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
728 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
729 success = false;
730 }
731 }
732
733 if (!flag.obsolete_in.is_undefined()) {
734 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
735 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
736 success = false;
737 }
738
739 // if flag has become obsolete it should not have a "globals" flag defined anymore.
740 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
741 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
742 // Temporarily disable the warning: 8196739
743 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
744 }
745 }
746 }
747
748 if (!flag.expired_in.is_undefined()) {
749 // if flag has become expired it should not have a "globals" flag defined anymore.
750 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
751 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
752 // Temporarily disable the warning: 8196739
753 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
754 }
755 }
756 }
757
758 }
759 return success;
760 }
761 #endif
762
763 // Parses a size specification string.
764 bool Arguments::atojulong(const char *s, julong* result) {
765 julong n = 0;
766
767 // First char must be a digit. Don't allow negative numbers or leading spaces.
768 if (!isdigit(*s)) {
769 return false;
770 }
771
772 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
773 char* remainder;
774 errno = 0;
775 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
776 if (errno != 0) {
777 return false;
778 }
779
780 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
781 if (remainder == s || strlen(remainder) > 1) {
782 return false;
783 }
784
785 switch (*remainder) {
786 case 'T': case 't':
787 *result = n * G * K;
788 // Check for overflow.
789 if (*result/((julong)G * K) != n) return false;
790 return true;
791 case 'G': case 'g':
792 *result = n * G;
793 if (*result/G != n) return false;
794 return true;
795 case 'M': case 'm':
796 *result = n * M;
797 if (*result/M != n) return false;
798 return true;
799 case 'K': case 'k':
800 *result = n * K;
801 if (*result/K != n) return false;
802 return true;
803 case '\0':
804 *result = n;
805 return true;
806 default:
807 return false;
808 }
809 }
810
811 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
812 if (size < min_size) return arg_too_small;
813 if (size > max_size) return arg_too_big;
814 return arg_in_range;
815 }
816
817 // Describe an argument out of range error
818 void Arguments::describe_range_error(ArgsRange errcode) {
819 switch(errcode) {
820 case arg_too_big:
821 jio_fprintf(defaultStream::error_stream(),
822 "The specified size exceeds the maximum "
823 "representable size.\n");
824 break;
825 case arg_too_small:
826 case arg_unreadable:
827 case arg_in_range:
828 // do nothing for now
829 break;
830 default:
831 ShouldNotReachHere();
832 }
833 }
834
835 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
836 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
837 return true;
838 } else {
839 return false;
840 }
841 }
842
843 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
844 char* end;
845 errno = 0;
846 double v = strtod(value, &end);
847 if ((errno != 0) || (*end != 0)) {
848 return false;
849 }
850
851 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
852 return true;
853 }
854 return false;
855 }
856
857 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
858 julong v;
859 int int_v;
860 intx intx_v;
861 bool is_neg = false;
862
863 if (flag == NULL) {
864 return false;
865 }
866
867 // Check the sign first since atojulong() parses only unsigned values.
868 if (*value == '-') {
869 if (!flag->is_intx() && !flag->is_int()) {
870 return false;
871 }
872 value++;
873 is_neg = true;
874 }
875 if (!Arguments::atojulong(value, &v)) {
876 return false;
877 }
878 if (flag->is_int()) {
879 int_v = (int) v;
880 if (is_neg) {
881 int_v = -int_v;
882 }
883 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
884 } else if (flag->is_uint()) {
885 uint uint_v = (uint) v;
886 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
887 } else if (flag->is_intx()) {
888 intx_v = (intx) v;
889 if (is_neg) {
890 intx_v = -intx_v;
891 }
892 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
893 } else if (flag->is_uintx()) {
894 uintx uintx_v = (uintx) v;
895 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
896 } else if (flag->is_uint64_t()) {
897 uint64_t uint64_t_v = (uint64_t) v;
898 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
899 } else if (flag->is_size_t()) {
900 size_t size_t_v = (size_t) v;
901 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
902 } else if (flag->is_double()) {
903 double double_v = (double) v;
904 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
905 } else {
906 return false;
907 }
908 }
909
910 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
911 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
912 // Contract: JVMFlag always returns a pointer that needs freeing.
913 FREE_C_HEAP_ARRAY(char, value);
914 return true;
915 }
916
917 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
918 const char* old_value = "";
919 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
920 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
921 size_t new_len = strlen(new_value);
922 const char* value;
923 char* free_this_too = NULL;
924 if (old_len == 0) {
925 value = new_value;
926 } else if (new_len == 0) {
927 value = old_value;
928 } else {
929 size_t length = old_len + 1 + new_len + 1;
930 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
931 // each new setting adds another LINE to the switch:
932 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
933 value = buf;
934 free_this_too = buf;
935 }
936 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
937 // JVMFlag always returns a pointer that needs freeing.
938 FREE_C_HEAP_ARRAY(char, value);
939 // JVMFlag made its own copy, so I must delete my own temp. buffer.
940 FREE_C_HEAP_ARRAY(char, free_this_too);
941 return true;
942 }
943
944 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
945 const char* real_name = real_flag_name(arg);
946 JDK_Version since = JDK_Version();
947 switch (is_deprecated_flag(arg, &since)) {
948 case -1:
949 return NULL; // obsolete or expired, don't process normally
950 case 0:
951 return real_name;
952 case 1: {
953 if (warn) {
954 char version[256];
955 since.to_string(version, sizeof(version));
956 if (real_name != arg) {
957 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
958 arg, version, real_name);
959 } else {
960 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
961 arg, version);
962 }
963 }
964 return real_name;
965 }
966 }
967 ShouldNotReachHere();
968 return NULL;
969 }
970
971 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
972 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
973 // Set tagset string buffer at max size of 256, large enough for any alias tagset
974 const int max_tagset_size = 256;
975 int max_tagset_len = max_tagset_size - 1;
976 char tagset_buffer[max_tagset_size];
977 tagset_buffer[0] = '\0';
978
979 // Write tag-set for aliased logging option, in string list form
980 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
981 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
982 if (i > 0) {
983 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
984 }
985 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
986 }
987 if (!alf.exactMatch) {
988 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
989 }
990 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
991 (on) ? "+" : "-",
992 name,
993 tagset_buffer,
994 (on) ? LogLevel::name(alf.level) : "off");
995 }
996
997 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
998 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
999 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1000 if (strcmp(alf.alias_name, name) == 0) {
1001 log_deprecated_flag(name, on, alf);
1002 return alf;
1003 }
1004 }
1005 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1006 return a;
1007 }
1008
1009 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1010
1011 // range of acceptable characters spelled out for portability reasons
1012 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1013 #define BUFLEN 255
1014 char name[BUFLEN+1];
1015 char dummy;
1016 const char* real_name;
1017 bool warn_if_deprecated = true;
1018
1019 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1020 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1021 if (alf.alias_name != NULL){
1022 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1023 return true;
1024 }
1025 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1026 if (real_name == NULL) {
1027 return false;
1028 }
1029 JVMFlag* flag = JVMFlag::find_flag(real_name);
1030 return set_bool_flag(flag, false, origin);
1031 }
1032 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1033 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1034 if (alf.alias_name != NULL){
1035 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1036 return true;
1037 }
1038 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1039 if (real_name == NULL) {
1040 return false;
1041 }
1042 JVMFlag* flag = JVMFlag::find_flag(real_name);
1043 return set_bool_flag(flag, true, origin);
1044 }
1045
1046 char punct;
1047 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1048 const char* value = strchr(arg, '=') + 1;
1049
1050 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1051 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1052 if (alf.alias_name != NULL) {
1053 LogConfiguration::configure_stdout(alf.level, 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 JVMFlag* flag = JVMFlag::find_flag(real_name);
1061 if (flag != NULL && flag->is_ccstr()) {
1062 if (flag->ccstr_accumulates()) {
1063 return append_to_string_flag(flag, value, origin);
1064 } else {
1065 if (value[0] == '\0') {
1066 value = NULL;
1067 }
1068 return set_string_flag(flag, value, origin);
1069 }
1070 } else {
1071 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1072 }
1073 }
1074
1075 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1076 const char* value = strchr(arg, '=') + 1;
1077 // -XX:Foo:=xxx will reset the string flag to the given value.
1078 if (value[0] == '\0') {
1079 value = NULL;
1080 }
1081 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1082 if (real_name == NULL) {
1083 return false;
1084 }
1085 JVMFlag* flag = JVMFlag::find_flag(real_name);
1086 return set_string_flag(flag, value, origin);
1087 }
1088
1089 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1090 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1091 #define NUMBER_RANGE "[0123456789eE+-]"
1092 char value[BUFLEN + 1];
1093 char value2[BUFLEN + 1];
1094 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1095 // Looks like a floating-point number -- try again with more lenient format string
1096 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1097 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1098 if (real_name == NULL) {
1099 return false;
1100 }
1101 JVMFlag* flag = JVMFlag::find_flag(real_name);
1102 return set_fp_numeric_flag(flag, value, origin);
1103 }
1104 }
1105
1106 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1107 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1109 if (real_name == NULL) {
1110 return false;
1111 }
1112 JVMFlag* flag = JVMFlag::find_flag(real_name);
1113 return set_numeric_flag(flag, value, origin);
1114 }
1115
1116 return false;
1117 }
1118
1119 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1120 assert(bldarray != NULL, "illegal argument");
1121
1122 if (arg == NULL) {
1123 return;
1124 }
1125
1126 int new_count = *count + 1;
1127
1128 // expand the array and add arg to the last element
1129 if (*bldarray == NULL) {
1130 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1131 } else {
1132 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1133 }
1134 (*bldarray)[*count] = os::strdup_check_oom(arg);
1135 *count = new_count;
1136 }
1137
1138 void Arguments::build_jvm_args(const char* arg) {
1139 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1140 }
1141
1142 void Arguments::build_jvm_flags(const char* arg) {
1143 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1144 }
1145
1146 // utility function to return a string that concatenates all
1147 // strings in a given char** array
1148 const char* Arguments::build_resource_string(char** args, int count) {
1149 if (args == NULL || count == 0) {
1150 return NULL;
1151 }
1152 size_t length = 0;
1153 for (int i = 0; i < count; i++) {
1154 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1155 }
1156 char* s = NEW_RESOURCE_ARRAY(char, length);
1157 char* dst = s;
1158 for (int j = 0; j < count; j++) {
1159 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1160 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1161 dst += offset;
1162 length -= offset;
1163 }
1164 return (const char*) s;
1165 }
1166
1167 void Arguments::print_on(outputStream* st) {
1168 st->print_cr("VM Arguments:");
1169 if (num_jvm_flags() > 0) {
1170 st->print("jvm_flags: "); print_jvm_flags_on(st);
1171 st->cr();
1172 }
1173 if (num_jvm_args() > 0) {
1174 st->print("jvm_args: "); print_jvm_args_on(st);
1175 st->cr();
1176 }
1177 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1178 if (_java_class_path != NULL) {
1179 char* path = _java_class_path->value();
1180 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1181 }
1182 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1183 }
1184
1185 void Arguments::print_summary_on(outputStream* st) {
1186 // Print the command line. Environment variables that are helpful for
1187 // reproducing the problem are written later in the hs_err file.
1188 // flags are from setting file
1189 if (num_jvm_flags() > 0) {
1190 st->print_raw("Settings File: ");
1191 print_jvm_flags_on(st);
1192 st->cr();
1193 }
1194 // args are the command line and environment variable arguments.
1195 st->print_raw("Command Line: ");
1196 if (num_jvm_args() > 0) {
1197 print_jvm_args_on(st);
1198 }
1199 // this is the classfile and any arguments to the java program
1200 if (java_command() != NULL) {
1201 st->print("%s", java_command());
1202 }
1203 st->cr();
1204 }
1205
1206 void Arguments::print_jvm_flags_on(outputStream* st) {
1207 if (_num_jvm_flags > 0) {
1208 for (int i=0; i < _num_jvm_flags; i++) {
1209 st->print("%s ", _jvm_flags_array[i]);
1210 }
1211 }
1212 }
1213
1214 void Arguments::print_jvm_args_on(outputStream* st) {
1215 if (_num_jvm_args > 0) {
1216 for (int i=0; i < _num_jvm_args; i++) {
1217 st->print("%s ", _jvm_args_array[i]);
1218 }
1219 }
1220 }
1221
1222 bool Arguments::process_argument(const char* arg,
1223 jboolean ignore_unrecognized,
1224 JVMFlag::Flags origin) {
1225 JDK_Version since = JDK_Version();
1226
1227 if (parse_argument(arg, origin)) {
1228 return true;
1229 }
1230
1231 // Determine if the flag has '+', '-', or '=' characters.
1232 bool has_plus_minus = (*arg == '+' || *arg == '-');
1233 const char* const argname = has_plus_minus ? arg + 1 : arg;
1234
1235 size_t arg_len;
1236 const char* equal_sign = strchr(argname, '=');
1237 if (equal_sign == NULL) {
1238 arg_len = strlen(argname);
1239 } else {
1240 arg_len = equal_sign - argname;
1241 }
1242
1243 // Only make the obsolete check for valid arguments.
1244 if (arg_len <= BUFLEN) {
1245 // Construct a string which consists only of the argument name without '+', '-', or '='.
1246 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1247 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1248 if (is_obsolete_flag(stripped_argname, &since)) {
1249 char version[256];
1250 since.to_string(version, sizeof(version));
1251 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1252 return true;
1253 }
1254 #ifndef PRODUCT
1255 else {
1256 const char* replacement;
1257 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1258 log_warning(arguments)("%s has been removed. Please use %s instead.",
1259 stripped_argname,
1260 replacement);
1261 return false;
1262 }
1263 }
1264 #endif //PRODUCT
1265 }
1266
1267 // For locked flags, report a custom error message if available.
1268 // Otherwise, report the standard unrecognized VM option.
1269 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1270 if (found_flag != NULL) {
1271 char locked_message_buf[BUFLEN];
1272 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1273 if (strlen(locked_message_buf) == 0) {
1274 if (found_flag->is_bool() && !has_plus_minus) {
1275 jio_fprintf(defaultStream::error_stream(),
1276 "Missing +/- setting for VM option '%s'\n", argname);
1277 } else if (!found_flag->is_bool() && has_plus_minus) {
1278 jio_fprintf(defaultStream::error_stream(),
1279 "Unexpected +/- setting in VM option '%s'\n", argname);
1280 } else {
1281 jio_fprintf(defaultStream::error_stream(),
1282 "Improperly specified VM option '%s'\n", argname);
1283 }
1284 } else {
1285 #ifdef PRODUCT
1286 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1287 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1288 if (ignore_unrecognized && mismatched) {
1289 return true;
1290 }
1291 #endif
1292 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1293 }
1294 } else {
1295 if (ignore_unrecognized) {
1296 return true;
1297 }
1298 jio_fprintf(defaultStream::error_stream(),
1299 "Unrecognized VM option '%s'\n", argname);
1300 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1301 if (fuzzy_matched != NULL) {
1302 jio_fprintf(defaultStream::error_stream(),
1303 "Did you mean '%s%s%s'? ",
1304 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1305 fuzzy_matched->_name,
1306 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1307 }
1308 }
1309
1310 // allow for commandline "commenting out" options like -XX:#+Verbose
1311 return arg[0] == '#';
1312 }
1313
1314 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1315 FILE* stream = fopen(file_name, "rb");
1316 if (stream == NULL) {
1317 if (should_exist) {
1318 jio_fprintf(defaultStream::error_stream(),
1319 "Could not open settings file %s\n", file_name);
1320 return false;
1321 } else {
1322 return true;
1323 }
1324 }
1325
1326 char token[1024];
1327 int pos = 0;
1328
1329 bool in_white_space = true;
1330 bool in_comment = false;
1331 bool in_quote = false;
1332 char quote_c = 0;
1333 bool result = true;
1334
1335 int c = getc(stream);
1336 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1337 if (in_white_space) {
1338 if (in_comment) {
1339 if (c == '\n') in_comment = false;
1340 } else {
1341 if (c == '#') in_comment = true;
1342 else if (!isspace(c)) {
1343 in_white_space = false;
1344 token[pos++] = c;
1345 }
1346 }
1347 } else {
1348 if (c == '\n' || (!in_quote && isspace(c))) {
1349 // token ends at newline, or at unquoted whitespace
1350 // this allows a way to include spaces in string-valued options
1351 token[pos] = '\0';
1352 logOption(token);
1353 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1354 build_jvm_flags(token);
1355 pos = 0;
1356 in_white_space = true;
1357 in_quote = false;
1358 } else if (!in_quote && (c == '\'' || c == '"')) {
1359 in_quote = true;
1360 quote_c = c;
1361 } else if (in_quote && (c == quote_c)) {
1362 in_quote = false;
1363 } else {
1364 token[pos++] = c;
1365 }
1366 }
1367 c = getc(stream);
1368 }
1369 if (pos > 0) {
1370 token[pos] = '\0';
1371 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1372 build_jvm_flags(token);
1373 }
1374 fclose(stream);
1375 return result;
1376 }
1377
1378 //=============================================================================================================
1379 // Parsing of properties (-D)
1380
1381 const char* Arguments::get_property(const char* key) {
1382 return PropertyList_get_value(system_properties(), key);
1383 }
1384
1385 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1386 const char* eq = strchr(prop, '=');
1387 const char* key;
1388 const char* value = "";
1389
1390 if (eq == NULL) {
1391 // property doesn't have a value, thus use passed string
1392 key = prop;
1393 } else {
1394 // property have a value, thus extract it and save to the
1395 // allocated string
1396 size_t key_len = eq - prop;
1397 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1398
1399 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1400 key = tmp_key;
1401
1402 value = &prop[key_len + 1];
1403 }
1404
1405 if (strcmp(key, "java.compiler") == 0) {
1406 process_java_compiler_argument(value);
1407 // Record value in Arguments, but let it get passed to Java.
1408 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1409 // sun.java.launcher.is_altjvm property is
1410 // private and is processed in process_sun_java_launcher_properties();
1411 // the sun.java.launcher property is passed on to the java application
1412 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1413 // append is true, writable is true, internal is false
1414 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1415 WriteableProperty, ExternalProperty);
1416 } else {
1417 if (strcmp(key, "sun.java.command") == 0) {
1418 char *old_java_command = _java_command;
1419 _java_command = os::strdup_check_oom(value, mtArguments);
1420 if (old_java_command != NULL) {
1421 os::free(old_java_command);
1422 }
1423 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1424 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1425 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1426 // its value without going through the property list or making a Java call.
1427 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1428 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1429 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1430 os::free((void *)old_java_vendor_url_bug);
1431 }
1432 }
1433
1434 // Create new property and add at the end of the list
1435 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1436 }
1437
1438 if (key != prop) {
1439 // SystemProperty copy passed value, thus free previously allocated
1440 // memory
1441 FreeHeap((void *)key);
1442 }
1443
1444 return true;
1445 }
1446
1447 #if INCLUDE_CDS
1448 const char* unsupported_properties[] = { "jdk.module.limitmods",
1449 "jdk.module.upgrade.path",
1450 "jdk.module.patch.0" };
1451 const char* unsupported_options[] = { "--limit-modules",
1452 "--upgrade-module-path",
1453 "--patch-module"
1454 };
1455 void Arguments::check_unsupported_dumping_properties() {
1456 assert(DumpSharedSpaces || DynamicDumpSharedSpaces,
1457 "this function is only used with CDS dump time");
1458 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1459 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1460 SystemProperty* sp = system_properties();
1461 while (sp != NULL) {
1462 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1463 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1464 vm_exit_during_initialization(
1465 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1466 }
1467 }
1468 sp = sp->next();
1469 }
1470
1471 // Check for an exploded module build in use with -Xshare:dump.
1472 if (!has_jimage()) {
1473 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1474 }
1475 }
1476
1477 bool Arguments::check_unsupported_cds_runtime_properties() {
1478 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1479 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1480 if (ArchiveClassesAtExit != NULL) {
1481 // dynamic dumping, just return false for now.
1482 // check_unsupported_dumping_properties() will be called later to check the same set of
1483 // properties, and will exit the VM with the correct error message if the unsupported properties
1484 // are used.
1485 return false;
1486 }
1487 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1488 if (get_property(unsupported_properties[i]) != NULL) {
1489 if (RequireSharedSpaces) {
1490 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1491 }
1492 return true;
1493 }
1494 }
1495 return false;
1496 }
1497 #endif
1498
1499 //===========================================================================================================
1500 // Setting int/mixed/comp mode flags
1501
1502 void Arguments::set_mode_flags(Mode mode) {
1503 // Set up default values for all flags.
1504 // If you add a flag to any of the branches below,
1505 // add a default value for it here.
1506 set_java_compiler(false);
1507 _mode = mode;
1508
1509 // Ensure Agent_OnLoad has the correct initial values.
1510 // This may not be the final mode; mode may change later in onload phase.
1511 PropertyList_unique_add(&_system_properties, "java.vm.info",
1512 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1513
1514 UseInterpreter = true;
1515 UseCompiler = true;
1516 UseLoopCounter = true;
1517
1518 // Default values may be platform/compiler dependent -
1519 // use the saved values
1520 ClipInlining = Arguments::_ClipInlining;
1521 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1522 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1523 BackgroundCompilation = Arguments::_BackgroundCompilation;
1524 if (TieredCompilation) {
1525 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1526 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1527 }
1528 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1529 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1530 }
1531 }
1532
1533 // Change from defaults based on mode
1534 switch (mode) {
1535 default:
1536 ShouldNotReachHere();
1537 break;
1538 case _int:
1539 UseCompiler = false;
1540 UseLoopCounter = false;
1541 AlwaysCompileLoopMethods = false;
1542 UseOnStackReplacement = false;
1543 break;
1544 case _mixed:
1545 // same as default
1546 break;
1547 case _comp:
1548 UseInterpreter = false;
1549 BackgroundCompilation = false;
1550 ClipInlining = false;
1551 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1552 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1553 // compile a level 4 (C2) and then continue executing it.
1554 if (TieredCompilation) {
1555 Tier3InvokeNotifyFreqLog = 0;
1556 Tier4InvocationThreshold = 0;
1557 }
1558 break;
1559 }
1560 }
1561
1562 // Conflict: required to use shared spaces (-Xshare:on), but
1563 // incompatible command line options were chosen.
1564 static void no_shared_spaces(const char* message) {
1565 if (RequireSharedSpaces) {
1566 jio_fprintf(defaultStream::error_stream(),
1567 "Class data sharing is inconsistent with other specified options.\n");
1568 vm_exit_during_initialization("Unable to use shared archive", message);
1569 } else {
1570 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1571 }
1572 }
1573
1574 void set_object_alignment() {
1575 // Object alignment.
1576 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1577 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1578 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1579 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1580 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1581 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1582
1583 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1584 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1585
1586 // Oop encoding heap max
1587 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1588
1589 if (SurvivorAlignmentInBytes == 0) {
1590 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1591 }
1592 }
1593
1594 size_t Arguments::max_heap_for_compressed_oops() {
1595 // Avoid sign flip.
1596 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1597 // We need to fit both the NULL page and the heap into the memory budget, while
1598 // keeping alignment constraints of the heap. To guarantee the latter, as the
1599 // NULL page is located before the heap, we pad the NULL page to the conservative
1600 // maximum alignment that the GC may ever impose upon the heap.
1601 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1602 _conservative_max_heap_alignment);
1603
1604 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1605 NOT_LP64(ShouldNotReachHere(); return 0);
1606 }
1607
1608 void Arguments::set_use_compressed_oops() {
1609 #ifndef ZERO
1610 #ifdef _LP64
1611 // MaxHeapSize is not set up properly at this point, but
1612 // the only value that can override MaxHeapSize if we are
1613 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1614 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1615
1616 if (max_heap_size <= max_heap_for_compressed_oops()) {
1617 #if !defined(COMPILER1) || defined(TIERED)
1618 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1619 FLAG_SET_ERGO(UseCompressedOops, true);
1620 }
1621 #endif
1622 } else {
1623 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1624 warning("Max heap size too large for Compressed Oops");
1625 FLAG_SET_DEFAULT(UseCompressedOops, false);
1626 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1627 }
1628 }
1629 #endif // _LP64
1630 #endif // ZERO
1631 }
1632
1633
1634 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1635 // set_use_compressed_oops().
1636 void Arguments::set_use_compressed_klass_ptrs() {
1637 #ifndef ZERO
1638 #ifdef _LP64
1639 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1640 if (!UseCompressedOops) {
1641 if (UseCompressedClassPointers) {
1642 warning("UseCompressedClassPointers requires UseCompressedOops");
1643 }
1644 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1645 } else {
1646 // Turn on UseCompressedClassPointers too
1647 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1648 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1649 }
1650 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1651 if (UseCompressedClassPointers) {
1652 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1653 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1654 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1655 }
1656 }
1657 }
1658 #endif // _LP64
1659 #endif // !ZERO
1660 }
1661
1662 void Arguments::set_conservative_max_heap_alignment() {
1663 // The conservative maximum required alignment for the heap is the maximum of
1664 // the alignments imposed by several sources: any requirements from the heap
1665 // itself and the maximum page size we may run the VM with.
1666 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1667 _conservative_max_heap_alignment = MAX4(heap_alignment,
1668 (size_t)os::vm_allocation_granularity(),
1669 os::max_page_size(),
1670 GCArguments::compute_heap_alignment());
1671 }
1672
1673 jint Arguments::set_ergonomics_flags() {
1674 GCConfig::initialize();
1675
1676 set_conservative_max_heap_alignment();
1677
1678 #ifndef ZERO
1679 #ifdef _LP64
1680 set_use_compressed_oops();
1681
1682 // set_use_compressed_klass_ptrs() must be called after calling
1683 // set_use_compressed_oops().
1684 set_use_compressed_klass_ptrs();
1685
1686 // Also checks that certain machines are slower with compressed oops
1687 // in vm_version initialization code.
1688 #endif // _LP64
1689 #endif // !ZERO
1690
1691 return JNI_OK;
1692 }
1693
1694 julong Arguments::limit_by_allocatable_memory(julong limit) {
1695 julong max_allocatable;
1696 julong result = limit;
1697 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1698 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1699 }
1700 return result;
1701 }
1702
1703 // Use static initialization to get the default before parsing
1704 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1705
1706 void Arguments::set_heap_size() {
1707 julong phys_mem;
1708
1709 // If the user specified one of these options, they
1710 // want specific memory sizing so do not limit memory
1711 // based on compressed oops addressability.
1712 // Also, memory limits will be calculated based on
1713 // available os physical memory, not our MaxRAM limit,
1714 // unless MaxRAM is also specified.
1715 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1716 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1717 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1718 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1719 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1720 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1721 !FLAG_IS_DEFAULT(MaxRAM));
1722 if (override_coop_limit) {
1723 if (FLAG_IS_DEFAULT(MaxRAM)) {
1724 phys_mem = os::physical_memory();
1725 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1726 } else {
1727 phys_mem = (julong)MaxRAM;
1728 }
1729 } else {
1730 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1731 : (julong)MaxRAM;
1732 }
1733
1734
1735 // Convert deprecated flags
1736 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1737 !FLAG_IS_DEFAULT(MaxRAMFraction))
1738 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1739
1740 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1741 !FLAG_IS_DEFAULT(MinRAMFraction))
1742 MinRAMPercentage = 100.0 / MinRAMFraction;
1743
1744 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1745 !FLAG_IS_DEFAULT(InitialRAMFraction))
1746 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1747
1748 // If the maximum heap size has not been set with -Xmx,
1749 // then set it as fraction of the size of physical memory,
1750 // respecting the maximum and minimum sizes of the heap.
1751 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1752 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1753 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1754 if (reasonable_min < MaxHeapSize) {
1755 // Small physical memory, so use a minimum fraction of it for the heap
1756 reasonable_max = reasonable_min;
1757 } else {
1758 // Not-small physical memory, so require a heap at least
1759 // as large as MaxHeapSize
1760 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1761 }
1762
1763 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1764 // Limit the heap size to ErgoHeapSizeLimit
1765 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1766 }
1767
1768 #ifdef _LP64
1769 if (UseCompressedOops) {
1770 // Limit the heap size to the maximum possible when using compressed oops
1771 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1772
1773 // HeapBaseMinAddress can be greater than default but not less than.
1774 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1775 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1776 // matches compressed oops printing flags
1777 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1778 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1779 DefaultHeapBaseMinAddress,
1780 DefaultHeapBaseMinAddress/G,
1781 HeapBaseMinAddress);
1782 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1783 }
1784 }
1785
1786 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1787 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1788 // but it should be not less than default MaxHeapSize.
1789 max_coop_heap -= HeapBaseMinAddress;
1790 }
1791
1792 // If user specified flags prioritizing os physical
1793 // memory limits, then disable compressed oops if
1794 // limits exceed max_coop_heap and UseCompressedOops
1795 // was not specified.
1796 if (reasonable_max > max_coop_heap) {
1797 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1798 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1799 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1800 "Please check the setting of MaxRAMPercentage %5.2f."
1801 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1802 FLAG_SET_ERGO(UseCompressedOops, false);
1803 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1804 } else {
1805 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1806 }
1807 }
1808 }
1809 #endif // _LP64
1810
1811 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1812
1813 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1814 // An initial heap size was specified on the command line,
1815 // so be sure that the maximum size is consistent. Done
1816 // after call to limit_by_allocatable_memory because that
1817 // method might reduce the allocation size.
1818 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1819 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1820 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1821 }
1822
1823 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1824 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1825 }
1826
1827 // If the minimum or initial heap_size have not been set or requested to be set
1828 // ergonomically, set them accordingly.
1829 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1830 julong reasonable_minimum = (julong)(OldSize + NewSize);
1831
1832 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1833
1834 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1835
1836 if (InitialHeapSize == 0) {
1837 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1838
1839 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1840 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1841
1842 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1843
1844 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1845 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1846 }
1847 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1848 // synchronize with InitialHeapSize to avoid errors with the default value.
1849 if (MinHeapSize == 0) {
1850 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1851 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1852 }
1853 }
1854 }
1855
1856 // This option inspects the machine and attempts to set various
1857 // parameters to be optimal for long-running, memory allocation
1858 // intensive jobs. It is intended for machines with large
1859 // amounts of cpu and memory.
1860 jint Arguments::set_aggressive_heap_flags() {
1861 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1862 // VM, but we may not be able to represent the total physical memory
1863 // available (like having 8gb of memory on a box but using a 32bit VM).
1864 // Thus, we need to make sure we're using a julong for intermediate
1865 // calculations.
1866 julong initHeapSize;
1867 julong total_memory = os::physical_memory();
1868
1869 if (total_memory < (julong) 256 * M) {
1870 jio_fprintf(defaultStream::error_stream(),
1871 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1872 vm_exit(1);
1873 }
1874
1875 // The heap size is half of available memory, or (at most)
1876 // all of possible memory less 160mb (leaving room for the OS
1877 // when using ISM). This is the maximum; because adaptive sizing
1878 // is turned on below, the actual space used may be smaller.
1879
1880 initHeapSize = MIN2(total_memory / (julong) 2,
1881 total_memory - (julong) 160 * M);
1882
1883 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1884
1885 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1886 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1887 return JNI_EINVAL;
1888 }
1889 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1890 return JNI_EINVAL;
1891 }
1892 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1893 return JNI_EINVAL;
1894 }
1895 }
1896 if (FLAG_IS_DEFAULT(NewSize)) {
1897 // Make the young generation 3/8ths of the total heap.
1898 if (FLAG_SET_CMDLINE(NewSize,
1899 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1900 return JNI_EINVAL;
1901 }
1902 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1903 return JNI_EINVAL;
1904 }
1905 }
1906
1907 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1908 FLAG_SET_DEFAULT(UseLargePages, true);
1909 #endif
1910
1911 // Increase some data structure sizes for efficiency
1912 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1913 return JNI_EINVAL;
1914 }
1915 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1916 return JNI_EINVAL;
1917 }
1918 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1919 return JNI_EINVAL;
1920 }
1921
1922 // See the OldPLABSize comment below, but replace 'after promotion'
1923 // with 'after copying'. YoungPLABSize is the size of the survivor
1924 // space per-gc-thread buffers. The default is 4kw.
1925 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1926 return JNI_EINVAL;
1927 }
1928
1929 // OldPLABSize is the size of the buffers in the old gen that
1930 // UseParallelGC uses to promote live data that doesn't fit in the
1931 // survivor spaces. At any given time, there's one for each gc thread.
1932 // The default size is 1kw. These buffers are rarely used, since the
1933 // survivor spaces are usually big enough. For specjbb, however, there
1934 // are occasions when there's lots of live data in the young gen
1935 // and we end up promoting some of it. We don't have a definite
1936 // explanation for why bumping OldPLABSize helps, but the theory
1937 // is that a bigger PLAB results in retaining something like the
1938 // original allocation order after promotion, which improves mutator
1939 // locality. A minor effect may be that larger PLABs reduce the
1940 // number of PLAB allocation events during gc. The value of 8kw
1941 // was arrived at by experimenting with specjbb.
1942 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1943 return JNI_EINVAL;
1944 }
1945
1946 // Enable parallel GC and adaptive generation sizing
1947 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1948 return JNI_EINVAL;
1949 }
1950
1951 // Encourage steady state memory management
1952 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1953 return JNI_EINVAL;
1954 }
1955
1956 // This appears to improve mutator locality
1957 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1958 return JNI_EINVAL;
1959 }
1960
1961 return JNI_OK;
1962 }
1963
1964 // This must be called after ergonomics.
1965 void Arguments::set_bytecode_flags() {
1966 if (!RewriteBytecodes) {
1967 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1968 }
1969 }
1970
1971 // Aggressive optimization flags
1972 jint Arguments::set_aggressive_opts_flags() {
1973 #ifdef COMPILER2
1974 if (AggressiveUnboxing) {
1975 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1976 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1977 } else if (!EliminateAutoBox) {
1978 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1979 AggressiveUnboxing = false;
1980 }
1981 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1982 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1983 } else if (!DoEscapeAnalysis) {
1984 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1985 AggressiveUnboxing = false;
1986 }
1987 }
1988 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1989 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1990 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1991 }
1992 // Feed the cache size setting into the JDK
1993 char buffer[1024];
1994 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1995 if (!add_property(buffer)) {
1996 return JNI_ENOMEM;
1997 }
1998 }
1999 #endif
2000
2001 return JNI_OK;
2002 }
2003
2004 //===========================================================================================================
2005 // Parsing of java.compiler property
2006
2007 void Arguments::process_java_compiler_argument(const char* arg) {
2008 // For backwards compatibility, Djava.compiler=NONE or ""
2009 // causes us to switch to -Xint mode UNLESS -Xdebug
2010 // is also specified.
2011 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2012 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2013 }
2014 }
2015
2016 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2017 _sun_java_launcher = os::strdup_check_oom(launcher);
2018 }
2019
2020 bool Arguments::created_by_java_launcher() {
2021 assert(_sun_java_launcher != NULL, "property must have value");
2022 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2023 }
2024
2025 bool Arguments::sun_java_launcher_is_altjvm() {
2026 return _sun_java_launcher_is_altjvm;
2027 }
2028
2029 //===========================================================================================================
2030 // Parsing of main arguments
2031
2032 unsigned int addreads_count = 0;
2033 unsigned int addexports_count = 0;
2034 unsigned int addopens_count = 0;
2035 unsigned int addmods_count = 0;
2036 unsigned int patch_mod_count = 0;
2037
2038 // Check the consistency of vm_init_args
2039 bool Arguments::check_vm_args_consistency() {
2040 // Method for adding checks for flag consistency.
2041 // The intent is to warn the user of all possible conflicts,
2042 // before returning an error.
2043 // Note: Needs platform-dependent factoring.
2044 bool status = true;
2045
2046 if (TLABRefillWasteFraction == 0) {
2047 jio_fprintf(defaultStream::error_stream(),
2048 "TLABRefillWasteFraction should be a denominator, "
2049 "not " SIZE_FORMAT "\n",
2050 TLABRefillWasteFraction);
2051 status = false;
2052 }
2053
2054 if (PrintNMTStatistics) {
2055 #if INCLUDE_NMT
2056 if (MemTracker::tracking_level() == NMT_off) {
2057 #endif // INCLUDE_NMT
2058 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2059 PrintNMTStatistics = false;
2060 #if INCLUDE_NMT
2061 }
2062 #endif
2063 }
2064
2065 status = CompilerConfig::check_args_consistency(status);
2066 #if INCLUDE_JVMCI
2067 if (status && EnableJVMCI) {
2068 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2069 AddProperty, UnwriteableProperty, InternalProperty);
2070 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2071 return false;
2072 }
2073 }
2074 #endif
2075
2076 #ifndef SUPPORT_RESERVED_STACK_AREA
2077 if (StackReservedPages != 0) {
2078 FLAG_SET_CMDLINE(StackReservedPages, 0);
2079 warning("Reserved Stack Area not supported on this platform");
2080 }
2081 #endif
2082
2083 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2084 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2085 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2086 }
2087 }
2088
2089 status = status && GCArguments::check_args_consistency();
2090
2091 return status;
2092 }
2093
2094 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2095 const char* option_type) {
2096 if (ignore) return false;
2097
2098 const char* spacer = " ";
2099 if (option_type == NULL) {
2100 option_type = ++spacer; // Set both to the empty string.
2101 }
2102
2103 jio_fprintf(defaultStream::error_stream(),
2104 "Unrecognized %s%soption: %s\n", option_type, spacer,
2105 option->optionString);
2106 return true;
2107 }
2108
2109 static const char* user_assertion_options[] = {
2110 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2111 };
2112
2113 static const char* system_assertion_options[] = {
2114 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2115 };
2116
2117 bool Arguments::parse_uintx(const char* value,
2118 uintx* uintx_arg,
2119 uintx min_size) {
2120
2121 // Check the sign first since atojulong() parses only unsigned values.
2122 bool value_is_positive = !(*value == '-');
2123
2124 if (value_is_positive) {
2125 julong n;
2126 bool good_return = atojulong(value, &n);
2127 if (good_return) {
2128 bool above_minimum = n >= min_size;
2129 bool value_is_too_large = n > max_uintx;
2130
2131 if (above_minimum && !value_is_too_large) {
2132 *uintx_arg = n;
2133 return true;
2134 }
2135 }
2136 }
2137 return false;
2138 }
2139
2140 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2141 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2142 char* property = AllocateHeap(prop_len, mtArguments);
2143 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2144 if (ret < 0 || ret >= (int)prop_len) {
2145 FreeHeap(property);
2146 return false;
2147 }
2148 bool added = add_property(property, UnwriteableProperty, internal);
2149 FreeHeap(property);
2150 return added;
2151 }
2152
2153 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2154 const unsigned int props_count_limit = 1000;
2155 const int max_digits = 3;
2156 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2157
2158 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2159 if (count < props_count_limit) {
2160 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2161 char* property = AllocateHeap(prop_len, mtArguments);
2162 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2163 if (ret < 0 || ret >= (int)prop_len) {
2164 FreeHeap(property);
2165 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2166 return false;
2167 }
2168 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2169 FreeHeap(property);
2170 return added;
2171 }
2172
2173 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2174 return false;
2175 }
2176
2177 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2178 julong* long_arg,
2179 julong min_size,
2180 julong max_size) {
2181 if (!atojulong(s, long_arg)) return arg_unreadable;
2182 return check_memory_size(*long_arg, min_size, max_size);
2183 }
2184
2185 // Parse JavaVMInitArgs structure
2186
2187 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2188 const JavaVMInitArgs *java_options_args,
2189 const JavaVMInitArgs *cmd_line_args) {
2190 bool patch_mod_javabase = false;
2191
2192 // Save default settings for some mode flags
2193 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2194 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2195 Arguments::_ClipInlining = ClipInlining;
2196 Arguments::_BackgroundCompilation = BackgroundCompilation;
2197 if (TieredCompilation) {
2198 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2199 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2200 }
2201
2202 // Setup flags for mixed which is the default
2203 set_mode_flags(_mixed);
2204
2205 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2206 // variable (if present).
2207 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2208 if (result != JNI_OK) {
2209 return result;
2210 }
2211
2212 // Parse args structure generated from the command line flags.
2213 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2214 if (result != JNI_OK) {
2215 return result;
2216 }
2217
2218 // Parse args structure generated from the _JAVA_OPTIONS environment
2219 // variable (if present) (mimics classic VM)
2220 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2221 if (result != JNI_OK) {
2222 return result;
2223 }
2224
2225 // We need to ensure processor and memory resources have been properly
2226 // configured - which may rely on arguments we just processed - before
2227 // doing the final argument processing. Any argument processing that
2228 // needs to know about processor and memory resources must occur after
2229 // this point.
2230
2231 os::init_container_support();
2232
2233 // Do final processing now that all arguments have been parsed
2234 result = finalize_vm_init_args(patch_mod_javabase);
2235 if (result != JNI_OK) {
2236 return result;
2237 }
2238
2239 return JNI_OK;
2240 }
2241
2242 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2243 // represents a valid JDWP agent. is_path==true denotes that we
2244 // are dealing with -agentpath (case where name is a path), otherwise with
2245 // -agentlib
2246 bool valid_jdwp_agent(char *name, bool is_path) {
2247 char *_name;
2248 const char *_jdwp = "jdwp";
2249 size_t _len_jdwp, _len_prefix;
2250
2251 if (is_path) {
2252 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2253 return false;
2254 }
2255
2256 _name++; // skip past last path separator
2257 _len_prefix = strlen(JNI_LIB_PREFIX);
2258
2259 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2260 return false;
2261 }
2262
2263 _name += _len_prefix;
2264 _len_jdwp = strlen(_jdwp);
2265
2266 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2267 _name += _len_jdwp;
2268 }
2269 else {
2270 return false;
2271 }
2272
2273 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2274 return false;
2275 }
2276
2277 return true;
2278 }
2279
2280 if (strcmp(name, _jdwp) == 0) {
2281 return true;
2282 }
2283
2284 return false;
2285 }
2286
2287 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2288 // --patch-module=<module>=<file>(<pathsep><file>)*
2289 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2290 // Find the equal sign between the module name and the path specification
2291 const char* module_equal = strchr(patch_mod_tail, '=');
2292 if (module_equal == NULL) {
2293 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2294 return JNI_ERR;
2295 } else {
2296 // Pick out the module name
2297 size_t module_len = module_equal - patch_mod_tail;
2298 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2299 if (module_name != NULL) {
2300 memcpy(module_name, patch_mod_tail, module_len);
2301 *(module_name + module_len) = '\0';
2302 // The path piece begins one past the module_equal sign
2303 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2304 FREE_C_HEAP_ARRAY(char, module_name);
2305 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2306 return JNI_ENOMEM;
2307 }
2308 } else {
2309 return JNI_ENOMEM;
2310 }
2311 }
2312 return JNI_OK;
2313 }
2314
2315 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2316 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2317 // The min and max sizes match the values in globals.hpp, but scaled
2318 // with K. The values have been chosen so that alignment with page
2319 // size doesn't change the max value, which makes the conversions
2320 // back and forth between Xss value and ThreadStackSize value easier.
2321 // The values have also been chosen to fit inside a 32-bit signed type.
2322 const julong min_ThreadStackSize = 0;
2323 const julong max_ThreadStackSize = 1 * M;
2324
2325 const julong min_size = min_ThreadStackSize * K;
2326 const julong max_size = max_ThreadStackSize * K;
2327
2328 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2329
2330 julong size = 0;
2331 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2332 if (errcode != arg_in_range) {
2333 bool silent = (option == NULL); // Allow testing to silence error messages
2334 if (!silent) {
2335 jio_fprintf(defaultStream::error_stream(),
2336 "Invalid thread stack size: %s\n", option->optionString);
2337 describe_range_error(errcode);
2338 }
2339 return JNI_EINVAL;
2340 }
2341
2342 // Internally track ThreadStackSize in units of 1024 bytes.
2343 const julong size_aligned = align_up(size, K);
2344 assert(size <= size_aligned,
2345 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2346 size, size_aligned);
2347
2348 const julong size_in_K = size_aligned / K;
2349 assert(size_in_K < (julong)max_intx,
2350 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2351 size_in_K);
2352
2353 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2354 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2355 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2356 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2357 max_expanded, size_in_K);
2358
2359 *out_ThreadStackSize = (intx)size_in_K;
2360
2361 return JNI_OK;
2362 }
2363
2364 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2365 // For match_option to return remaining or value part of option string
2366 const char* tail;
2367
2368 // iterate over arguments
2369 for (int index = 0; index < args->nOptions; index++) {
2370 bool is_absolute_path = false; // for -agentpath vs -agentlib
2371
2372 const JavaVMOption* option = args->options + index;
2373
2374 if (!match_option(option, "-Djava.class.path", &tail) &&
2375 !match_option(option, "-Dsun.java.command", &tail) &&
2376 !match_option(option, "-Dsun.java.launcher", &tail)) {
2377
2378 // add all jvm options to the jvm_args string. This string
2379 // is used later to set the java.vm.args PerfData string constant.
2380 // the -Djava.class.path and the -Dsun.java.command options are
2381 // omitted from jvm_args string as each have their own PerfData
2382 // string constant object.
2383 build_jvm_args(option->optionString);
2384 }
2385
2386 // -verbose:[class/module/gc/jni]
2387 if (match_option(option, "-verbose", &tail)) {
2388 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2389 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2390 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2391 } else if (!strcmp(tail, ":module")) {
2392 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2393 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2394 } else if (!strcmp(tail, ":gc")) {
2395 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2396 } else if (!strcmp(tail, ":jni")) {
2397 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2398 return JNI_EINVAL;
2399 }
2400 }
2401 // -da / -ea / -disableassertions / -enableassertions
2402 // These accept an optional class/package name separated by a colon, e.g.,
2403 // -da:java.lang.Thread.
2404 } else if (match_option(option, user_assertion_options, &tail, true)) {
2405 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2406 if (*tail == '\0') {
2407 JavaAssertions::setUserClassDefault(enable);
2408 } else {
2409 assert(*tail == ':', "bogus match by match_option()");
2410 JavaAssertions::addOption(tail + 1, enable);
2411 }
2412 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2413 } else if (match_option(option, system_assertion_options, &tail, false)) {
2414 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2415 JavaAssertions::setSystemClassDefault(enable);
2416 // -bootclasspath:
2417 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2418 jio_fprintf(defaultStream::output_stream(),
2419 "-Xbootclasspath is no longer a supported option.\n");
2420 return JNI_EINVAL;
2421 // -bootclasspath/a:
2422 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2423 Arguments::append_sysclasspath(tail);
2424 // -bootclasspath/p:
2425 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2426 jio_fprintf(defaultStream::output_stream(),
2427 "-Xbootclasspath/p is no longer a supported option.\n");
2428 return JNI_EINVAL;
2429 // -Xrun
2430 } else if (match_option(option, "-Xrun", &tail)) {
2431 if (tail != NULL) {
2432 const char* pos = strchr(tail, ':');
2433 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2434 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2435 jio_snprintf(name, len + 1, "%s", tail);
2436
2437 char *options = NULL;
2438 if(pos != NULL) {
2439 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2440 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2441 }
2442 #if !INCLUDE_JVMTI
2443 if (strcmp(name, "jdwp") == 0) {
2444 jio_fprintf(defaultStream::error_stream(),
2445 "Debugging agents are not supported in this VM\n");
2446 return JNI_ERR;
2447 }
2448 #endif // !INCLUDE_JVMTI
2449 add_init_library(name, options);
2450 }
2451 } else if (match_option(option, "--add-reads=", &tail)) {
2452 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2453 return JNI_ENOMEM;
2454 }
2455 } else if (match_option(option, "--add-exports=", &tail)) {
2456 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2457 return JNI_ENOMEM;
2458 }
2459 } else if (match_option(option, "--add-opens=", &tail)) {
2460 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2461 return JNI_ENOMEM;
2462 }
2463 } else if (match_option(option, "--add-modules=", &tail)) {
2464 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2465 return JNI_ENOMEM;
2466 }
2467 } else if (match_option(option, "--limit-modules=", &tail)) {
2468 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2469 return JNI_ENOMEM;
2470 }
2471 } else if (match_option(option, "--module-path=", &tail)) {
2472 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2473 return JNI_ENOMEM;
2474 }
2475 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2476 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2477 return JNI_ENOMEM;
2478 }
2479 } else if (match_option(option, "--patch-module=", &tail)) {
2480 // --patch-module=<module>=<file>(<pathsep><file>)*
2481 int res = process_patch_mod_option(tail, patch_mod_javabase);
2482 if (res != JNI_OK) {
2483 return res;
2484 }
2485 } else if (match_option(option, "--illegal-access=", &tail)) {
2486 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2487 return JNI_ENOMEM;
2488 }
2489 // -agentlib and -agentpath
2490 } else if (match_option(option, "-agentlib:", &tail) ||
2491 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2492 if(tail != NULL) {
2493 const char* pos = strchr(tail, '=');
2494 char* name;
2495 if (pos == NULL) {
2496 name = os::strdup_check_oom(tail, mtArguments);
2497 } else {
2498 size_t len = pos - tail;
2499 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2500 memcpy(name, tail, len);
2501 name[len] = '\0';
2502 }
2503
2504 char *options = NULL;
2505 if(pos != NULL) {
2506 options = os::strdup_check_oom(pos + 1, mtArguments);
2507 }
2508 #if !INCLUDE_JVMTI
2509 if (valid_jdwp_agent(name, is_absolute_path)) {
2510 jio_fprintf(defaultStream::error_stream(),
2511 "Debugging agents are not supported in this VM\n");
2512 return JNI_ERR;
2513 }
2514 #endif // !INCLUDE_JVMTI
2515 add_init_agent(name, options, is_absolute_path);
2516 }
2517 // -javaagent
2518 } else if (match_option(option, "-javaagent:", &tail)) {
2519 #if !INCLUDE_JVMTI
2520 jio_fprintf(defaultStream::error_stream(),
2521 "Instrumentation agents are not supported in this VM\n");
2522 return JNI_ERR;
2523 #else
2524 if (tail != NULL) {
2525 size_t length = strlen(tail) + 1;
2526 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2527 jio_snprintf(options, length, "%s", tail);
2528 add_instrument_agent("instrument", options, false);
2529 // java agents need module java.instrument
2530 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2531 return JNI_ENOMEM;
2532 }
2533 }
2534 #endif // !INCLUDE_JVMTI
2535 // --enable_preview
2536 } else if (match_option(option, "--enable-preview")) {
2537 set_enable_preview();
2538 // -Xnoclassgc
2539 } else if (match_option(option, "-Xnoclassgc")) {
2540 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2541 return JNI_EINVAL;
2542 }
2543 // -Xconcgc
2544 } else if (match_option(option, "-Xconcgc")) {
2545 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2546 return JNI_EINVAL;
2547 }
2548 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2549 // -Xnoconcgc
2550 } else if (match_option(option, "-Xnoconcgc")) {
2551 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2552 return JNI_EINVAL;
2553 }
2554 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2555 // -Xbatch
2556 } else if (match_option(option, "-Xbatch")) {
2557 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2558 return JNI_EINVAL;
2559 }
2560 // -Xmn for compatibility with other JVM vendors
2561 } else if (match_option(option, "-Xmn", &tail)) {
2562 julong long_initial_young_size = 0;
2563 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2564 if (errcode != arg_in_range) {
2565 jio_fprintf(defaultStream::error_stream(),
2566 "Invalid initial young generation size: %s\n", option->optionString);
2567 describe_range_error(errcode);
2568 return JNI_EINVAL;
2569 }
2570 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2571 return JNI_EINVAL;
2572 }
2573 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2574 return JNI_EINVAL;
2575 }
2576 // -Xms
2577 } else if (match_option(option, "-Xms", &tail)) {
2578 julong size = 0;
2579 // an initial heap size of 0 means automatically determine
2580 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2581 if (errcode != arg_in_range) {
2582 jio_fprintf(defaultStream::error_stream(),
2583 "Invalid initial heap size: %s\n", option->optionString);
2584 describe_range_error(errcode);
2585 return JNI_EINVAL;
2586 }
2587 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2588 return JNI_EINVAL;
2589 }
2590 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2591 return JNI_EINVAL;
2592 }
2593 // -Xmx
2594 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2595 julong long_max_heap_size = 0;
2596 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2597 if (errcode != arg_in_range) {
2598 jio_fprintf(defaultStream::error_stream(),
2599 "Invalid maximum heap size: %s\n", option->optionString);
2600 describe_range_error(errcode);
2601 return JNI_EINVAL;
2602 }
2603 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2604 return JNI_EINVAL;
2605 }
2606 // Xmaxf
2607 } else if (match_option(option, "-Xmaxf", &tail)) {
2608 char* err;
2609 int maxf = (int)(strtod(tail, &err) * 100);
2610 if (*err != '\0' || *tail == '\0') {
2611 jio_fprintf(defaultStream::error_stream(),
2612 "Bad max heap free percentage size: %s\n",
2613 option->optionString);
2614 return JNI_EINVAL;
2615 } else {
2616 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2617 return JNI_EINVAL;
2618 }
2619 }
2620 // Xminf
2621 } else if (match_option(option, "-Xminf", &tail)) {
2622 char* err;
2623 int minf = (int)(strtod(tail, &err) * 100);
2624 if (*err != '\0' || *tail == '\0') {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Bad min heap free percentage size: %s\n",
2627 option->optionString);
2628 return JNI_EINVAL;
2629 } else {
2630 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2631 return JNI_EINVAL;
2632 }
2633 }
2634 // -Xss
2635 } else if (match_option(option, "-Xss", &tail)) {
2636 intx value = 0;
2637 jint err = parse_xss(option, tail, &value);
2638 if (err != JNI_OK) {
2639 return err;
2640 }
2641 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2645 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2646 julong long_ReservedCodeCacheSize = 0;
2647
2648 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2649 if (errcode != arg_in_range) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Invalid maximum code cache size: %s.\n", option->optionString);
2652 return JNI_EINVAL;
2653 }
2654 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2655 return JNI_EINVAL;
2656 }
2657 // -green
2658 } else if (match_option(option, "-green")) {
2659 jio_fprintf(defaultStream::error_stream(),
2660 "Green threads support not available\n");
2661 return JNI_EINVAL;
2662 // -native
2663 } else if (match_option(option, "-native")) {
2664 // HotSpot always uses native threads, ignore silently for compatibility
2665 // -Xrs
2666 } else if (match_option(option, "-Xrs")) {
2667 // Classic/EVM option, new functionality
2668 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 // -Xprof
2672 } else if (match_option(option, "-Xprof")) {
2673 char version[256];
2674 // Obsolete in JDK 10
2675 JDK_Version::jdk(10).to_string(version, sizeof(version));
2676 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2677 // -Xinternalversion
2678 } else if (match_option(option, "-Xinternalversion")) {
2679 jio_fprintf(defaultStream::output_stream(), "%s\n",
2680 VM_Version::internal_vm_info_string());
2681 vm_exit(0);
2682 #ifndef PRODUCT
2683 // -Xprintflags
2684 } else if (match_option(option, "-Xprintflags")) {
2685 JVMFlag::printFlags(tty, false);
2686 vm_exit(0);
2687 #endif
2688 // -D
2689 } else if (match_option(option, "-D", &tail)) {
2690 const char* value;
2691 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2692 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2693 // abort if -Djava.endorsed.dirs is set
2694 jio_fprintf(defaultStream::output_stream(),
2695 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2696 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2697 return JNI_EINVAL;
2698 }
2699 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2700 *value != '\0' && strcmp(value, "\"\"") != 0) {
2701 // abort if -Djava.ext.dirs is set
2702 jio_fprintf(defaultStream::output_stream(),
2703 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2704 return JNI_EINVAL;
2705 }
2706 // Check for module related properties. They must be set using the modules
2707 // options. For example: use "--add-modules=java.sql", not
2708 // "-Djdk.module.addmods=java.sql"
2709 if (is_internal_module_property(option->optionString + 2)) {
2710 needs_module_property_warning = true;
2711 continue;
2712 }
2713
2714 if (!add_property(tail)) {
2715 return JNI_ENOMEM;
2716 }
2717 // Out of the box management support
2718 if (match_option(option, "-Dcom.sun.management", &tail)) {
2719 #if INCLUDE_MANAGEMENT
2720 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 // management agent in module jdk.management.agent
2724 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2725 return JNI_ENOMEM;
2726 }
2727 #else
2728 jio_fprintf(defaultStream::output_stream(),
2729 "-Dcom.sun.management is not supported in this VM.\n");
2730 return JNI_ERR;
2731 #endif
2732 }
2733 // -Xint
2734 } else if (match_option(option, "-Xint")) {
2735 set_mode_flags(_int);
2736 // -Xmixed
2737 } else if (match_option(option, "-Xmixed")) {
2738 set_mode_flags(_mixed);
2739 // -Xcomp
2740 } else if (match_option(option, "-Xcomp")) {
2741 // for testing the compiler; turn off all flags that inhibit compilation
2742 set_mode_flags(_comp);
2743 // -Xshare:dump
2744 } else if (match_option(option, "-Xshare:dump")) {
2745 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 // -Xshare:on
2749 } else if (match_option(option, "-Xshare:on")) {
2750 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2751 return JNI_EINVAL;
2752 }
2753 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2757 } else if (match_option(option, "-Xshare:auto")) {
2758 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 // -Xshare:off
2765 } else if (match_option(option, "-Xshare:off")) {
2766 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2770 return JNI_EINVAL;
2771 }
2772 // -Xverify
2773 } else if (match_option(option, "-Xverify", &tail)) {
2774 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2775 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 } else if (strcmp(tail, ":remote") == 0) {
2782 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2786 return JNI_EINVAL;
2787 }
2788 } else if (strcmp(tail, ":none") == 0) {
2789 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2790 return JNI_EINVAL;
2791 }
2792 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2793 return JNI_EINVAL;
2794 }
2795 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2796 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2797 return JNI_EINVAL;
2798 }
2799 // -Xdebug
2800 } else if (match_option(option, "-Xdebug")) {
2801 // note this flag has been used, then ignore
2802 set_xdebug_mode(true);
2803 // -Xnoagent
2804 } else if (match_option(option, "-Xnoagent")) {
2805 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2806 } else if (match_option(option, "-Xloggc:", &tail)) {
2807 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2808 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2809 _gc_log_filename = os::strdup_check_oom(tail);
2810 } else if (match_option(option, "-Xlog", &tail)) {
2811 bool ret = false;
2812 if (strcmp(tail, ":help") == 0) {
2813 fileStream stream(defaultStream::output_stream());
2814 LogConfiguration::print_command_line_help(&stream);
2815 vm_exit(0);
2816 } else if (strcmp(tail, ":disable") == 0) {
2817 LogConfiguration::disable_logging();
2818 ret = true;
2819 } else if (*tail == '\0') {
2820 ret = LogConfiguration::parse_command_line_arguments();
2821 assert(ret, "-Xlog without arguments should never fail to parse");
2822 } else if (*tail == ':') {
2823 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2824 }
2825 if (ret == false) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2828 tail);
2829 return JNI_EINVAL;
2830 }
2831 // JNI hooks
2832 } else if (match_option(option, "-Xcheck", &tail)) {
2833 if (!strcmp(tail, ":jni")) {
2834 #if !INCLUDE_JNI_CHECK
2835 warning("JNI CHECKING is not supported in this VM");
2836 #else
2837 CheckJNICalls = true;
2838 #endif // INCLUDE_JNI_CHECK
2839 } else if (is_bad_option(option, args->ignoreUnrecognized,
2840 "check")) {
2841 return JNI_EINVAL;
2842 }
2843 } else if (match_option(option, "vfprintf")) {
2844 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2845 } else if (match_option(option, "exit")) {
2846 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2847 } else if (match_option(option, "abort")) {
2848 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2849 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2850 // and the last option wins.
2851 } else if (match_option(option, "-XX:+NeverTenure")) {
2852 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2862 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2866 return JNI_EINVAL;
2867 }
2868 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2869 return JNI_EINVAL;
2870 }
2871 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2872 uintx max_tenuring_thresh = 0;
2873 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2874 jio_fprintf(defaultStream::error_stream(),
2875 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2876 return JNI_EINVAL;
2877 }
2878
2879 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882
2883 if (MaxTenuringThreshold == 0) {
2884 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 } else {
2891 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2895 return JNI_EINVAL;
2896 }
2897 }
2898 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2899 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2903 return JNI_EINVAL;
2904 }
2905 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2906 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2910 return JNI_EINVAL;
2911 }
2912 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2913 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2920 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2921 return JNI_EINVAL;
2922 }
2923 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2927 #if defined(DTRACE_ENABLED)
2928 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 #else // defined(DTRACE_ENABLED)
2941 jio_fprintf(defaultStream::error_stream(),
2942 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2943 return JNI_EINVAL;
2944 #endif // defined(DTRACE_ENABLED)
2945 #ifdef ASSERT
2946 } else if (match_option(option, "-XX:+FullGCALot")) {
2947 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 // disable scavenge before parallel mark-compact
2951 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 #endif
2955 #if !INCLUDE_MANAGEMENT
2956 } else if (match_option(option, "-XX:+ManagementServer")) {
2957 jio_fprintf(defaultStream::error_stream(),
2958 "ManagementServer is not supported in this VM.\n");
2959 return JNI_ERR;
2960 #endif // INCLUDE_MANAGEMENT
2961 #if INCLUDE_JFR
2962 } else if (match_jfr_option(&option)) {
2963 return JNI_EINVAL;
2964 #endif
2965 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2966 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2967 // already been handled
2968 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2969 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2970 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2971 return JNI_EINVAL;
2972 }
2973 }
2974 // Unknown option
2975 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2976 return JNI_ERR;
2977 }
2978 }
2979
2980 // PrintSharedArchiveAndExit will turn on
2981 // -Xshare:on
2982 // -Xlog:class+path=info
2983 if (PrintSharedArchiveAndExit) {
2984 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2985 return JNI_EINVAL;
2986 }
2987 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2991 }
2992
2993 fix_appclasspath();
2994
2995 return JNI_OK;
2996 }
2997
2998 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2999 // For java.base check for duplicate --patch-module options being specified on the command line.
3000 // This check is only required for java.base, all other duplicate module specifications
3001 // will be checked during module system initialization. The module system initialization
3002 // will throw an ExceptionInInitializerError if this situation occurs.
3003 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3004 if (*patch_mod_javabase) {
3005 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3006 } else {
3007 *patch_mod_javabase = true;
3008 }
3009 }
3010
3011 // Create GrowableArray lazily, only if --patch-module has been specified
3012 if (_patch_mod_prefix == NULL) {
3013 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3014 }
3015
3016 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3017 }
3018
3019 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3020 //
3021 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3022 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3023 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3024 // path is treated as the current directory.
3025 //
3026 // This causes problems with CDS, which requires that all directories specified in the classpath
3027 // must be empty. In most cases, applications do NOT want to load classes from the current
3028 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3029 // scripts compatible with CDS.
3030 void Arguments::fix_appclasspath() {
3031 if (IgnoreEmptyClassPaths) {
3032 const char separator = *os::path_separator();
3033 const char* src = _java_class_path->value();
3034
3035 // skip over all the leading empty paths
3036 while (*src == separator) {
3037 src ++;
3038 }
3039
3040 char* copy = os::strdup_check_oom(src, mtArguments);
3041
3042 // trim all trailing empty paths
3043 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3044 *tail = '\0';
3045 }
3046
3047 char from[3] = {separator, separator, '\0'};
3048 char to [2] = {separator, '\0'};
3049 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3050 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3051 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3052 }
3053
3054 _java_class_path->set_writeable_value(copy);
3055 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3056 }
3057 }
3058
3059 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3060 // check if the default lib/endorsed directory exists; if so, error
3061 char path[JVM_MAXPATHLEN];
3062 const char* fileSep = os::file_separator();
3063 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3064
3065 DIR* dir = os::opendir(path);
3066 if (dir != NULL) {
3067 jio_fprintf(defaultStream::output_stream(),
3068 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3069 "in modular form will be supported via the concept of upgradeable modules.\n");
3070 os::closedir(dir);
3071 return JNI_ERR;
3072 }
3073
3074 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3075 dir = os::opendir(path);
3076 if (dir != NULL) {
3077 jio_fprintf(defaultStream::output_stream(),
3078 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3079 "Use -classpath instead.\n.");
3080 os::closedir(dir);
3081 return JNI_ERR;
3082 }
3083
3084 // This must be done after all arguments have been processed
3085 // and the container support has been initialized since AggressiveHeap
3086 // relies on the amount of total memory available.
3087 if (AggressiveHeap) {
3088 jint result = set_aggressive_heap_flags();
3089 if (result != JNI_OK) {
3090 return result;
3091 }
3092 }
3093
3094 // This must be done after all arguments have been processed.
3095 // java_compiler() true means set to "NONE" or empty.
3096 if (java_compiler() && !xdebug_mode()) {
3097 // For backwards compatibility, we switch to interpreted mode if
3098 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3099 // not specified.
3100 set_mode_flags(_int);
3101 }
3102
3103 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3104 // but like -Xint, leave compilation thresholds unaffected.
3105 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3106 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3107 set_mode_flags(_int);
3108 }
3109
3110 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3111 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3112 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3113 }
3114
3115 #if !COMPILER2_OR_JVMCI
3116 // Don't degrade server performance for footprint
3117 if (FLAG_IS_DEFAULT(UseLargePages) &&
3118 MaxHeapSize < LargePageHeapSizeThreshold) {
3119 // No need for large granularity pages w/small heaps.
3120 // Note that large pages are enabled/disabled for both the
3121 // Java heap and the code cache.
3122 FLAG_SET_DEFAULT(UseLargePages, false);
3123 }
3124
3125 UNSUPPORTED_OPTION(ProfileInterpreter);
3126 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3127 #endif
3128
3129 #ifndef TIERED
3130 // Tiered compilation is undefined.
3131 UNSUPPORTED_OPTION(TieredCompilation);
3132 #endif
3133
3134 if (!check_vm_args_consistency()) {
3135 return JNI_ERR;
3136 }
3137
3138 #if INCLUDE_CDS
3139 if (DumpSharedSpaces) {
3140 // Disable biased locking now as it interferes with the clean up of
3141 // the archived Klasses and Java string objects (at dump time only).
3142 UseBiasedLocking = false;
3143
3144 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3145 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3146 // compiler just to be safe.
3147 //
3148 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3149 // instead of modifying them in place. The copy is inaccessible to the compiler.
3150 // TODO: revisit the following for the static archive case.
3151 set_mode_flags(_int);
3152 }
3153 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3154 // Always verify non-system classes during CDS dump
3155 if (!BytecodeVerificationRemote) {
3156 BytecodeVerificationRemote = true;
3157 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3158 }
3159 }
3160 if (ArchiveClassesAtExit == NULL) {
3161 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3162 }
3163 if (UseSharedSpaces && patch_mod_javabase) {
3164 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3165 }
3166 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3167 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3168 }
3169 #endif
3170
3171 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3172 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3173 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3174
3175 return JNI_OK;
3176 }
3177
3178 // Helper class for controlling the lifetime of JavaVMInitArgs
3179 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3180 // deleted on the destruction of the ScopedVMInitArgs object.
3181 class ScopedVMInitArgs : public StackObj {
3182 private:
3183 JavaVMInitArgs _args;
3184 char* _container_name;
3185 bool _is_set;
3186 char* _vm_options_file_arg;
3187
3188 public:
3189 ScopedVMInitArgs(const char *container_name) {
3190 _args.version = JNI_VERSION_1_2;
3191 _args.nOptions = 0;
3192 _args.options = NULL;
3193 _args.ignoreUnrecognized = false;
3194 _container_name = (char *)container_name;
3195 _is_set = false;
3196 _vm_options_file_arg = NULL;
3197 }
3198
3199 // Populates the JavaVMInitArgs object represented by this
3200 // ScopedVMInitArgs object with the arguments in options. The
3201 // allocated memory is deleted by the destructor. If this method
3202 // returns anything other than JNI_OK, then this object is in a
3203 // partially constructed state, and should be abandoned.
3204 jint set_args(GrowableArray<JavaVMOption>* options) {
3205 _is_set = true;
3206 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3207 JavaVMOption, options->length(), mtArguments);
3208 if (options_arr == NULL) {
3209 return JNI_ENOMEM;
3210 }
3211 _args.options = options_arr;
3212
3213 for (int i = 0; i < options->length(); i++) {
3214 options_arr[i] = options->at(i);
3215 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3216 if (options_arr[i].optionString == NULL) {
3217 // Rely on the destructor to do cleanup.
3218 _args.nOptions = i;
3219 return JNI_ENOMEM;
3220 }
3221 }
3222
3223 _args.nOptions = options->length();
3224 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3225 return JNI_OK;
3226 }
3227
3228 JavaVMInitArgs* get() { return &_args; }
3229 char* container_name() { return _container_name; }
3230 bool is_set() { return _is_set; }
3231 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3232 char* vm_options_file_arg() { return _vm_options_file_arg; }
3233
3234 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3235 if (_vm_options_file_arg != NULL) {
3236 os::free(_vm_options_file_arg);
3237 }
3238 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3239 }
3240
3241 ~ScopedVMInitArgs() {
3242 if (_vm_options_file_arg != NULL) {
3243 os::free(_vm_options_file_arg);
3244 }
3245 if (_args.options == NULL) return;
3246 for (int i = 0; i < _args.nOptions; i++) {
3247 os::free(_args.options[i].optionString);
3248 }
3249 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3250 }
3251
3252 // Insert options into this option list, to replace option at
3253 // vm_options_file_pos (-XX:VMOptionsFile)
3254 jint insert(const JavaVMInitArgs* args,
3255 const JavaVMInitArgs* args_to_insert,
3256 const int vm_options_file_pos) {
3257 assert(_args.options == NULL, "shouldn't be set yet");
3258 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3259 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3260
3261 int length = args->nOptions + args_to_insert->nOptions - 1;
3262 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3263 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3264 for (int i = 0; i < args->nOptions; i++) {
3265 if (i == vm_options_file_pos) {
3266 // insert the new options starting at the same place as the
3267 // -XX:VMOptionsFile option
3268 for (int j = 0; j < args_to_insert->nOptions; j++) {
3269 options->push(args_to_insert->options[j]);
3270 }
3271 } else {
3272 options->push(args->options[i]);
3273 }
3274 }
3275 // make into options array
3276 jint result = set_args(options);
3277 delete options;
3278 return result;
3279 }
3280 };
3281
3282 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3283 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3284 }
3285
3286 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3287 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3288 }
3289
3290 jint Arguments::parse_options_environment_variable(const char* name,
3291 ScopedVMInitArgs* vm_args) {
3292 char *buffer = ::getenv(name);
3293
3294 // Don't check this environment variable if user has special privileges
3295 // (e.g. unix su command).
3296 if (buffer == NULL || os::have_special_privileges()) {
3297 return JNI_OK;
3298 }
3299
3300 if ((buffer = os::strdup(buffer)) == NULL) {
3301 return JNI_ENOMEM;
3302 }
3303
3304 jio_fprintf(defaultStream::error_stream(),
3305 "Picked up %s: %s\n", name, buffer);
3306
3307 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3308
3309 os::free(buffer);
3310 return retcode;
3311 }
3312
3313 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3314 // read file into buffer
3315 int fd = ::open(file_name, O_RDONLY);
3316 if (fd < 0) {
3317 jio_fprintf(defaultStream::error_stream(),
3318 "Could not open options file '%s'\n",
3319 file_name);
3320 return JNI_ERR;
3321 }
3322
3323 struct stat stbuf;
3324 int retcode = os::stat(file_name, &stbuf);
3325 if (retcode != 0) {
3326 jio_fprintf(defaultStream::error_stream(),
3327 "Could not stat options file '%s'\n",
3328 file_name);
3329 os::close(fd);
3330 return JNI_ERR;
3331 }
3332
3333 if (stbuf.st_size == 0) {
3334 // tell caller there is no option data and that is ok
3335 os::close(fd);
3336 return JNI_OK;
3337 }
3338
3339 // '+ 1' for NULL termination even with max bytes
3340 size_t bytes_alloc = stbuf.st_size + 1;
3341
3342 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3343 if (NULL == buf) {
3344 jio_fprintf(defaultStream::error_stream(),
3345 "Could not allocate read buffer for options file parse\n");
3346 os::close(fd);
3347 return JNI_ENOMEM;
3348 }
3349
3350 memset(buf, 0, bytes_alloc);
3351
3352 // Fill buffer
3353 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3354 os::close(fd);
3355 if (bytes_read < 0) {
3356 FREE_C_HEAP_ARRAY(char, buf);
3357 jio_fprintf(defaultStream::error_stream(),
3358 "Could not read options file '%s'\n", file_name);
3359 return JNI_ERR;
3360 }
3361
3362 if (bytes_read == 0) {
3363 // tell caller there is no option data and that is ok
3364 FREE_C_HEAP_ARRAY(char, buf);
3365 return JNI_OK;
3366 }
3367
3368 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3369
3370 FREE_C_HEAP_ARRAY(char, buf);
3371 return retcode;
3372 }
3373
3374 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3375 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3376
3377 // some pointers to help with parsing
3378 char *buffer_end = buffer + buf_len;
3379 char *opt_hd = buffer;
3380 char *wrt = buffer;
3381 char *rd = buffer;
3382
3383 // parse all options
3384 while (rd < buffer_end) {
3385 // skip leading white space from the input string
3386 while (rd < buffer_end && isspace(*rd)) {
3387 rd++;
3388 }
3389
3390 if (rd >= buffer_end) {
3391 break;
3392 }
3393
3394 // Remember this is where we found the head of the token.
3395 opt_hd = wrt;
3396
3397 // Tokens are strings of non white space characters separated
3398 // by one or more white spaces.
3399 while (rd < buffer_end && !isspace(*rd)) {
3400 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3401 int quote = *rd; // matching quote to look for
3402 rd++; // don't copy open quote
3403 while (rd < buffer_end && *rd != quote) {
3404 // include everything (even spaces)
3405 // up until the close quote
3406 *wrt++ = *rd++; // copy to option string
3407 }
3408
3409 if (rd < buffer_end) {
3410 rd++; // don't copy close quote
3411 } else {
3412 // did not see closing quote
3413 jio_fprintf(defaultStream::error_stream(),
3414 "Unmatched quote in %s\n", name);
3415 delete options;
3416 return JNI_ERR;
3417 }
3418 } else {
3419 *wrt++ = *rd++; // copy to option string
3420 }
3421 }
3422
3423 // steal a white space character and set it to NULL
3424 *wrt++ = '\0';
3425 // We now have a complete token
3426
3427 JavaVMOption option;
3428 option.optionString = opt_hd;
3429 option.extraInfo = NULL;
3430
3431 options->append(option); // Fill in option
3432
3433 rd++; // Advance to next character
3434 }
3435
3436 // Fill out JavaVMInitArgs structure.
3437 jint status = vm_args->set_args(options);
3438
3439 delete options;
3440 return status;
3441 }
3442
3443 void Arguments::set_shared_spaces_flags() {
3444 if (DumpSharedSpaces) {
3445 if (RequireSharedSpaces) {
3446 warning("Cannot dump shared archive while using shared archive");
3447 }
3448 UseSharedSpaces = false;
3449 #ifdef _LP64
3450 if (!UseCompressedOops || !UseCompressedClassPointers) {
3451 vm_exit_during_initialization(
3452 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3453 }
3454 } else {
3455 if (!UseCompressedOops || !UseCompressedClassPointers) {
3456 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3457 }
3458 #endif
3459 }
3460 }
3461
3462 #if INCLUDE_CDS
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 int Arguments::num_archives(const char* archive_path) {
3483 if (archive_path == NULL) {
3484 return 0;
3485 }
3486 int npaths = 1;
3487 char* p = (char*)archive_path;
3488 while (*p != '\0') {
3489 if (*p == os::path_separator()[0]) {
3490 npaths++;
3491 }
3492 p++;
3493 }
3494 return npaths;
3495 }
3496
3497 void Arguments::extract_shared_archive_paths(const char* archive_path,
3498 char** base_archive_path,
3499 char** top_archive_path) {
3500 char* begin_ptr = (char*)archive_path;
3501 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3502 if (end_ptr == NULL || end_ptr == begin_ptr) {
3503 vm_exit_during_initialization("Base archive was not specified", archive_path);
3504 }
3505 size_t len = end_ptr - begin_ptr;
3506 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3507 strncpy(cur_path, begin_ptr, len);
3508 cur_path[len] = '\0';
3509 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3510 *base_archive_path = cur_path;
3511
3512 begin_ptr = ++end_ptr;
3513 if (*begin_ptr == '\0') {
3514 vm_exit_during_initialization("Top archive was not specified", archive_path);
3515 }
3516 end_ptr = strchr(begin_ptr, '\0');
3517 assert(end_ptr != NULL, "sanity");
3518 len = end_ptr - begin_ptr;
3519 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3520 strncpy(cur_path, begin_ptr, len + 1);
3521 //cur_path[len] = '\0';
3522 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3523 *top_archive_path = cur_path;
3524 }
3525
3526 bool Arguments::init_shared_archive_paths() {
3527 if (ArchiveClassesAtExit != NULL) {
3528 if (DumpSharedSpaces) {
3529 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3530 }
3531 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3532 return false;
3533 }
3534 check_unsupported_dumping_properties();
3535 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3536 }
3537 if (SharedArchiveFile == NULL) {
3538 SharedArchivePath = get_default_shared_archive_path();
3539 } else {
3540 int archives = num_archives(SharedArchiveFile);
3541 if (DynamicDumpSharedSpaces || DumpSharedSpaces) {
3542 if (archives > 1) {
3543 vm_exit_during_initialization(
3544 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3545 }
3546 if (DynamicDumpSharedSpaces) {
3547 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3548 vm_exit_during_initialization(
3549 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3550 SharedArchiveFile);
3551 }
3552 }
3553 }
3554 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){
3555 if (archives > 2) {
3556 vm_exit_during_initialization(
3557 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3558 }
3559 if (archives == 1) {
3560 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3561 int name_size;
3562 bool success =
3563 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3564 if (!success) {
3565 SharedArchivePath = temp_archive_path;
3566 } else {
3567 SharedDynamicArchivePath = temp_archive_path;
3568 }
3569 } else {
3570 extract_shared_archive_paths((const char*)SharedArchiveFile,
3571 &SharedArchivePath, &SharedDynamicArchivePath);
3572 }
3573 } else { // CDS dumping
3574 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3575 }
3576 }
3577 return (SharedArchivePath != NULL);
3578 }
3579 #endif // INCLUDE_CDS
3580
3581 #ifndef PRODUCT
3582 // Determine whether LogVMOutput should be implicitly turned on.
3583 static bool use_vm_log() {
3584 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3585 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3586 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3587 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3588 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3589 return true;
3590 }
3591
3592 #ifdef COMPILER1
3593 if (PrintC1Statistics) {
3594 return true;
3595 }
3596 #endif // COMPILER1
3597
3598 #ifdef COMPILER2
3599 if (PrintOptoAssembly || PrintOptoStatistics) {
3600 return true;
3601 }
3602 #endif // COMPILER2
3603
3604 return false;
3605 }
3606
3607 #endif // PRODUCT
3608
3609 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3610 for (int index = 0; index < args->nOptions; index++) {
3611 const JavaVMOption* option = args->options + index;
3612 const char* tail;
3613 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3614 return true;
3615 }
3616 }
3617 return false;
3618 }
3619
3620 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3621 const char* vm_options_file,
3622 const int vm_options_file_pos,
3623 ScopedVMInitArgs* vm_options_file_args,
3624 ScopedVMInitArgs* args_out) {
3625 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3626 if (code != JNI_OK) {
3627 return code;
3628 }
3629
3630 if (vm_options_file_args->get()->nOptions < 1) {
3631 return JNI_OK;
3632 }
3633
3634 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3635 jio_fprintf(defaultStream::error_stream(),
3636 "A VM options file may not refer to a VM options file. "
3637 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3638 "options file '%s' in options container '%s' is an error.\n",
3639 vm_options_file_args->vm_options_file_arg(),
3640 vm_options_file_args->container_name());
3641 return JNI_EINVAL;
3642 }
3643
3644 return args_out->insert(args, vm_options_file_args->get(),
3645 vm_options_file_pos);
3646 }
3647
3648 // Expand -XX:VMOptionsFile found in args_in as needed.
3649 // mod_args and args_out parameters may return values as needed.
3650 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3651 ScopedVMInitArgs* mod_args,
3652 JavaVMInitArgs** args_out) {
3653 jint code = match_special_option_and_act(args_in, mod_args);
3654 if (code != JNI_OK) {
3655 return code;
3656 }
3657
3658 if (mod_args->is_set()) {
3659 // args_in contains -XX:VMOptionsFile and mod_args contains the
3660 // original options from args_in along with the options expanded
3661 // from the VMOptionsFile. Return a short-hand to the caller.
3662 *args_out = mod_args->get();
3663 } else {
3664 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3665 }
3666 return JNI_OK;
3667 }
3668
3669 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3670 ScopedVMInitArgs* args_out) {
3671 // Remaining part of option string
3672 const char* tail;
3673 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3674
3675 for (int index = 0; index < args->nOptions; index++) {
3676 const JavaVMOption* option = args->options + index;
3677 if (match_option(option, "-XX:Flags=", &tail)) {
3678 Arguments::set_jvm_flags_file(tail);
3679 continue;
3680 }
3681 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3682 if (vm_options_file_args.found_vm_options_file_arg()) {
3683 jio_fprintf(defaultStream::error_stream(),
3684 "The option '%s' is already specified in the options "
3685 "container '%s' so the specification of '%s' in the "
3686 "same options container is an error.\n",
3687 vm_options_file_args.vm_options_file_arg(),
3688 vm_options_file_args.container_name(),
3689 option->optionString);
3690 return JNI_EINVAL;
3691 }
3692 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3693 // If there's a VMOptionsFile, parse that
3694 jint code = insert_vm_options_file(args, tail, index,
3695 &vm_options_file_args, args_out);
3696 if (code != JNI_OK) {
3697 return code;
3698 }
3699 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3700 if (args_out->is_set()) {
3701 // The VMOptions file inserted some options so switch 'args'
3702 // to the new set of options, and continue processing which
3703 // preserves "last option wins" semantics.
3704 args = args_out->get();
3705 // The first option from the VMOptionsFile replaces the
3706 // current option. So we back track to process the
3707 // replacement option.
3708 index--;
3709 }
3710 continue;
3711 }
3712 if (match_option(option, "-XX:+PrintVMOptions")) {
3713 PrintVMOptions = true;
3714 continue;
3715 }
3716 if (match_option(option, "-XX:-PrintVMOptions")) {
3717 PrintVMOptions = false;
3718 continue;
3719 }
3720 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3721 IgnoreUnrecognizedVMOptions = true;
3722 continue;
3723 }
3724 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3725 IgnoreUnrecognizedVMOptions = false;
3726 continue;
3727 }
3728 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3729 JVMFlag::printFlags(tty, false);
3730 vm_exit(0);
3731 }
3732 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3733 #if INCLUDE_NMT
3734 // The launcher did not setup nmt environment variable properly.
3735 if (!MemTracker::check_launcher_nmt_support(tail)) {
3736 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3737 }
3738
3739 // Verify if nmt option is valid.
3740 if (MemTracker::verify_nmt_option()) {
3741 // Late initialization, still in single-threaded mode.
3742 if (MemTracker::tracking_level() >= NMT_summary) {
3743 MemTracker::init();
3744 }
3745 } else {
3746 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3747 }
3748 continue;
3749 #else
3750 jio_fprintf(defaultStream::error_stream(),
3751 "Native Memory Tracking is not supported in this VM\n");
3752 return JNI_ERR;
3753 #endif
3754 }
3755
3756 #ifndef PRODUCT
3757 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3758 JVMFlag::printFlags(tty, true);
3759 vm_exit(0);
3760 }
3761 #endif
3762 }
3763 return JNI_OK;
3764 }
3765
3766 static void print_options(const JavaVMInitArgs *args) {
3767 const char* tail;
3768 for (int index = 0; index < args->nOptions; index++) {
3769 const JavaVMOption *option = args->options + index;
3770 if (match_option(option, "-XX:", &tail)) {
3771 logOption(tail);
3772 }
3773 }
3774 }
3775
3776 bool Arguments::handle_deprecated_print_gc_flags() {
3777 if (PrintGC) {
3778 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3779 }
3780 if (PrintGCDetails) {
3781 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3782 }
3783
3784 if (_gc_log_filename != NULL) {
3785 // -Xloggc was used to specify a filename
3786 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3787
3788 LogTarget(Error, logging) target;
3789 LogStream errstream(target);
3790 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3791 } else if (PrintGC || PrintGCDetails) {
3792 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3793 }
3794 return true;
3795 }
3796
3797 void Arguments::handle_extra_cms_flags(const char* msg) {
3798 SpecialFlag flag;
3799 const char *flag_name = "UseConcMarkSweepGC";
3800 if (lookup_special_flag(flag_name, flag)) {
3801 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3802 warning("%s", msg);
3803 }
3804 }
3805
3806 // Parse entry point called from JNI_CreateJavaVM
3807
3808 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3809 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3810
3811 // Initialize ranges, constraints and writeables
3812 JVMFlagRangeList::init();
3813 JVMFlagConstraintList::init();
3814 JVMFlagWriteableList::init();
3815
3816 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3817 const char* hotspotrc = ".hotspotrc";
3818 bool settings_file_specified = false;
3819 bool needs_hotspotrc_warning = false;
3820 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3821 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3822
3823 // Pointers to current working set of containers
3824 JavaVMInitArgs* cur_cmd_args;
3825 JavaVMInitArgs* cur_java_options_args;
3826 JavaVMInitArgs* cur_java_tool_options_args;
3827
3828 // Containers for modified/expanded options
3829 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3830 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3831 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3832
3833
3834 jint code =
3835 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3836 if (code != JNI_OK) {
3837 return code;
3838 }
3839
3840 code = parse_java_options_environment_variable(&initial_java_options_args);
3841 if (code != JNI_OK) {
3842 return code;
3843 }
3844
3845 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3846 &mod_java_tool_options_args,
3847 &cur_java_tool_options_args);
3848 if (code != JNI_OK) {
3849 return code;
3850 }
3851
3852 code = expand_vm_options_as_needed(initial_cmd_args,
3853 &mod_cmd_args,
3854 &cur_cmd_args);
3855 if (code != JNI_OK) {
3856 return code;
3857 }
3858
3859 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3860 &mod_java_options_args,
3861 &cur_java_options_args);
3862 if (code != JNI_OK) {
3863 return code;
3864 }
3865
3866 const char* flags_file = Arguments::get_jvm_flags_file();
3867 settings_file_specified = (flags_file != NULL);
3868
3869 if (IgnoreUnrecognizedVMOptions) {
3870 cur_cmd_args->ignoreUnrecognized = true;
3871 cur_java_tool_options_args->ignoreUnrecognized = true;
3872 cur_java_options_args->ignoreUnrecognized = true;
3873 }
3874
3875 // Parse specified settings file
3876 if (settings_file_specified) {
3877 if (!process_settings_file(flags_file, true,
3878 cur_cmd_args->ignoreUnrecognized)) {
3879 return JNI_EINVAL;
3880 }
3881 } else {
3882 #ifdef ASSERT
3883 // Parse default .hotspotrc settings file
3884 if (!process_settings_file(".hotspotrc", false,
3885 cur_cmd_args->ignoreUnrecognized)) {
3886 return JNI_EINVAL;
3887 }
3888 #else
3889 struct stat buf;
3890 if (os::stat(hotspotrc, &buf) == 0) {
3891 needs_hotspotrc_warning = true;
3892 }
3893 #endif
3894 }
3895
3896 if (PrintVMOptions) {
3897 print_options(cur_java_tool_options_args);
3898 print_options(cur_cmd_args);
3899 print_options(cur_java_options_args);
3900 }
3901
3902 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3903 jint result = parse_vm_init_args(cur_java_tool_options_args,
3904 cur_java_options_args,
3905 cur_cmd_args);
3906
3907 if (result != JNI_OK) {
3908 return result;
3909 }
3910
3911 #if INCLUDE_CDS
3912 // Initialize shared archive paths which could include both base and dynamic archive paths
3913 if (!init_shared_archive_paths()) {
3914 return JNI_ENOMEM;
3915 }
3916 #endif
3917
3918 // Delay warning until here so that we've had a chance to process
3919 // the -XX:-PrintWarnings flag
3920 if (needs_hotspotrc_warning) {
3921 warning("%s file is present but has been ignored. "
3922 "Run with -XX:Flags=%s to load the file.",
3923 hotspotrc, hotspotrc);
3924 }
3925
3926 if (needs_module_property_warning) {
3927 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3928 " names that are reserved for internal use.");
3929 }
3930
3931 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3932 UNSUPPORTED_OPTION(UseLargePages);
3933 #endif
3934
3935 #if defined(AIX)
3936 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3937 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3938 #endif
3939
3940 #ifndef PRODUCT
3941 if (TraceBytecodesAt != 0) {
3942 TraceBytecodes = true;
3943 }
3944 if (CountCompiledCalls) {
3945 if (UseCounterDecay) {
3946 warning("UseCounterDecay disabled because CountCalls is set");
3947 UseCounterDecay = false;
3948 }
3949 }
3950 #endif // PRODUCT
3951
3952 if (ScavengeRootsInCode == 0) {
3953 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3954 warning("Forcing ScavengeRootsInCode non-zero");
3955 }
3956 ScavengeRootsInCode = 1;
3957 }
3958
3959 if (!handle_deprecated_print_gc_flags()) {
3960 return JNI_EINVAL;
3961 }
3962
3963 // Set object alignment values.
3964 set_object_alignment();
3965
3966 #if !INCLUDE_CDS
3967 if (DumpSharedSpaces || RequireSharedSpaces) {
3968 jio_fprintf(defaultStream::error_stream(),
3969 "Shared spaces are not supported in this VM\n");
3970 return JNI_ERR;
3971 }
3972 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3973 log_is_enabled(Info, cds)) {
3974 warning("Shared spaces are not supported in this VM");
3975 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3976 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3977 }
3978 no_shared_spaces("CDS Disabled");
3979 #endif // INCLUDE_CDS
3980
3981 return JNI_OK;
3982 }
3983
3984 jint Arguments::apply_ergo() {
3985 // Set flags based on ergonomics.
3986 jint result = set_ergonomics_flags();
3987 if (result != JNI_OK) return result;
3988
3989 // Set heap size based on available physical memory
3990 set_heap_size();
3991
3992 GCConfig::arguments()->initialize();
3993
3994 set_shared_spaces_flags();
3995
3996 // Initialize Metaspace flags and alignments
3997 Metaspace::ergo_initialize();
3998
3999 // Set compiler flags after GC is selected and GC specific
4000 // flags (LoopStripMiningIter) are set.
4001 CompilerConfig::ergo_initialize();
4002
4003 // Set bytecode rewriting flags
4004 set_bytecode_flags();
4005
4006 // Set flags if aggressive optimization flags are enabled
4007 jint code = set_aggressive_opts_flags();
4008 if (code != JNI_OK) {
4009 return code;
4010 }
4011
4012 // Turn off biased locking for locking debug mode flags,
4013 // which are subtly different from each other but neither works with
4014 // biased locking
4015 if (UseHeavyMonitors
4016 #ifdef COMPILER1
4017 || !UseFastLocking
4018 #endif // COMPILER1
4019 #if INCLUDE_JVMCI
4020 || !JVMCIUseFastLocking
4021 #endif
4022 ) {
4023 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4024 // flag set to true on command line; warn the user that they
4025 // can't enable biased locking here
4026 warning("Biased Locking is not supported with locking debug flags"
4027 "; ignoring UseBiasedLocking flag." );
4028 }
4029 UseBiasedLocking = false;
4030 }
4031
4032 #ifdef CC_INTERP
4033 // Clear flags not supported on zero.
4034 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4035 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4036 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4037 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4038 #endif // CC_INTERP
4039
4040 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4041 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4042 DebugNonSafepoints = true;
4043 }
4044
4045 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4046 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4047 }
4048
4049 // Treat the odd case where local verification is enabled but remote
4050 // verification is not as if both were enabled.
4051 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4052 log_info(verification)("Turning on remote verification because local verification is on");
4053 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4054 }
4055
4056 #ifndef PRODUCT
4057 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4058 if (use_vm_log()) {
4059 LogVMOutput = true;
4060 }
4061 }
4062 #endif // PRODUCT
4063
4064 if (PrintCommandLineFlags) {
4065 JVMFlag::printSetFlags(tty);
4066 }
4067
4068 // Apply CPU specific policy for the BiasedLocking
4069 if (UseBiasedLocking) {
4070 if (!VM_Version::use_biased_locking() &&
4071 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4072 UseBiasedLocking = false;
4073 }
4074 }
4075 #ifdef COMPILER2
4076 if (!UseBiasedLocking) {
4077 UseOptoBiasInlining = false;
4078 }
4079 #endif
4080
4081 #if defined(IA32)
4082 // Only server compiler can optimize safepoints well enough.
4083 if (!is_server_compilation_mode_vm()) {
4084 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false);
4085 }
4086 #endif
4087
4088 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4089 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4090 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4091 } else {
4092 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4093 }
4094
4095 return JNI_OK;
4096 }
4097
4098 jint Arguments::adjust_after_os() {
4099 if (UseNUMA) {
4100 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4101 FLAG_SET_ERGO(UseNUMA, false);
4102 } else if (UseParallelGC || UseParallelOldGC) {
4103 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4104 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4105 }
4106 }
4107 // UseNUMAInterleaving is set to ON for all collectors and
4108 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4109 // such as the parallel collector for Linux and Solaris will
4110 // interleave old gen and survivor spaces on top of NUMA
4111 // allocation policy for the eden space.
4112 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4113 // all platforms and ParallelGC on Windows will interleave all
4114 // of the heap spaces across NUMA nodes.
4115 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4116 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4117 }
4118 }
4119 return JNI_OK;
4120 }
4121
4122 int Arguments::PropertyList_count(SystemProperty* pl) {
4123 int count = 0;
4124 while(pl != NULL) {
4125 count++;
4126 pl = pl->next();
4127 }
4128 return count;
4129 }
4130
4131 // Return the number of readable properties.
4132 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4133 int count = 0;
4134 while(pl != NULL) {
4135 if (pl->is_readable()) {
4136 count++;
4137 }
4138 pl = pl->next();
4139 }
4140 return count;
4141 }
4142
4143 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4144 assert(key != NULL, "just checking");
4145 SystemProperty* prop;
4146 for (prop = pl; prop != NULL; prop = prop->next()) {
4147 if (strcmp(key, prop->key()) == 0) return prop->value();
4148 }
4149 return NULL;
4150 }
4151
4152 // Return the value of the requested property provided that it is a readable property.
4153 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4154 assert(key != NULL, "just checking");
4155 SystemProperty* prop;
4156 // Return the property value if the keys match and the property is not internal or
4157 // it's the special internal property "jdk.boot.class.path.append".
4158 for (prop = pl; prop != NULL; prop = prop->next()) {
4159 if (strcmp(key, prop->key()) == 0) {
4160 if (!prop->internal()) {
4161 return prop->value();
4162 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4163 return prop->value();
4164 } else {
4165 // Property is internal and not jdk.boot.class.path.append so return NULL.
4166 return NULL;
4167 }
4168 }
4169 }
4170 return NULL;
4171 }
4172
4173 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4174 int count = 0;
4175 const char* ret_val = NULL;
4176
4177 while(pl != NULL) {
4178 if(count >= index) {
4179 ret_val = pl->key();
4180 break;
4181 }
4182 count++;
4183 pl = pl->next();
4184 }
4185
4186 return ret_val;
4187 }
4188
4189 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4190 int count = 0;
4191 char* ret_val = NULL;
4192
4193 while(pl != NULL) {
4194 if(count >= index) {
4195 ret_val = pl->value();
4196 break;
4197 }
4198 count++;
4199 pl = pl->next();
4200 }
4201
4202 return ret_val;
4203 }
4204
4205 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4206 SystemProperty* p = *plist;
4207 if (p == NULL) {
4208 *plist = new_p;
4209 } else {
4210 while (p->next() != NULL) {
4211 p = p->next();
4212 }
4213 p->set_next(new_p);
4214 }
4215 }
4216
4217 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4218 bool writeable, bool internal) {
4219 if (plist == NULL)
4220 return;
4221
4222 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4223 PropertyList_add(plist, new_p);
4224 }
4225
4226 void Arguments::PropertyList_add(SystemProperty *element) {
4227 PropertyList_add(&_system_properties, element);
4228 }
4229
4230 // This add maintains unique property key in the list.
4231 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4232 PropertyAppendable append, PropertyWriteable writeable,
4233 PropertyInternal internal) {
4234 if (plist == NULL)
4235 return;
4236
4237 // If property key exist then update with new value.
4238 SystemProperty* prop;
4239 for (prop = *plist; prop != NULL; prop = prop->next()) {
4240 if (strcmp(k, prop->key()) == 0) {
4241 if (append == AppendProperty) {
4242 prop->append_value(v);
4243 } else {
4244 prop->set_value(v);
4245 }
4246 return;
4247 }
4248 }
4249
4250 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4251 }
4252
4253 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4254 // Returns true if all of the source pointed by src has been copied over to
4255 // the destination buffer pointed by buf. Otherwise, returns false.
4256 // Notes:
4257 // 1. If the length (buflen) of the destination buffer excluding the
4258 // NULL terminator character is not long enough for holding the expanded
4259 // pid characters, it also returns false instead of returning the partially
4260 // expanded one.
4261 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4262 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4263 char* buf, size_t buflen) {
4264 const char* p = src;
4265 char* b = buf;
4266 const char* src_end = &src[srclen];
4267 char* buf_end = &buf[buflen - 1];
4268
4269 while (p < src_end && b < buf_end) {
4270 if (*p == '%') {
4271 switch (*(++p)) {
4272 case '%': // "%%" ==> "%"
4273 *b++ = *p++;
4274 break;
4275 case 'p': { // "%p" ==> current process id
4276 // buf_end points to the character before the last character so
4277 // that we could write '\0' to the end of the buffer.
4278 size_t buf_sz = buf_end - b + 1;
4279 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4280
4281 // if jio_snprintf fails or the buffer is not long enough to hold
4282 // the expanded pid, returns false.
4283 if (ret < 0 || ret >= (int)buf_sz) {
4284 return false;
4285 } else {
4286 b += ret;
4287 assert(*b == '\0', "fail in copy_expand_pid");
4288 if (p == src_end && b == buf_end + 1) {
4289 // reach the end of the buffer.
4290 return true;
4291 }
4292 }
4293 p++;
4294 break;
4295 }
4296 default :
4297 *b++ = '%';
4298 }
4299 } else {
4300 *b++ = *p++;
4301 }
4302 }
4303 *b = '\0';
4304 return (p == src_end); // return false if not all of the source was copied
4305 }