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