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