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