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 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
534 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
535
536 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
537 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
538 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
540
541 // -------------- Obsolete Flags - sorted by expired_in --------------
542 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
543 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
544 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
545 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
546 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
547 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
548 { "ProfilerPrintByteCodeStatistics", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
549 { "ProfilerRecordPC", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
550 { "ProfileVM", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
551 { "ProfileIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
552 { "ProfileIntervalsTicks", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
553 { "ProfilerCheckIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
554 { "ProfilerNumberOfInterpretedMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
555 { "ProfilerNumberOfCompiledMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
556 { "ProfilerNumberOfStubMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
557 { "ProfilerNumberOfRuntimeStubNodes", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
558 { "UseImplicitStableValues", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
559
560 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
561 // These entries will generate build errors. Their purpose is to test the macros.
562 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
563 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
564 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
565 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
566 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
567 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
568 #endif
569
570 { NULL, JDK_Version(0), JDK_Version(0) }
571 };
572
573 // Flags that are aliases for other flags.
574 typedef struct {
575 const char* alias_name;
576 const char* real_name;
577 } AliasedFlag;
578
579 static AliasedFlag const aliased_jvm_flags[] = {
580 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
581 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
582 { NULL, NULL}
583 };
584
585 // NOTE: A compatibility request will be necessary for each alias to be removed.
586 static AliasedLoggingFlag const aliased_logging_flags[] = {
587 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
588 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
589 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
590 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
591 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
592 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
593 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
594 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
595 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
596 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
597 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
598 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
599 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
600 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
601 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
602 };
603
604 #ifndef PRODUCT
605 // These options are removed in jdk9. Remove this code for jdk10.
606 static AliasedFlag const removed_develop_logging_flags[] = {
607 { "TraceClassInitialization", "-Xlog:class+init" },
608 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
609 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
610 { "TraceItables", "-Xlog:itables=debug" },
611 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
612 { "TraceSafepoint", "-Xlog:safepoint=debug" },
613 { "TraceStartupTime", "-Xlog:startuptime" },
614 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
615 { "PrintVtables", "-Xlog:vtables=debug" },
616 { "VerboseVerification", "-Xlog:verification" },
617 { NULL, NULL }
618 };
619 #endif //PRODUCT
620
621 // Return true if "v" is less than "other", where "other" may be "undefined".
622 static bool version_less_than(JDK_Version v, JDK_Version other) {
623 assert(!v.is_undefined(), "must be defined");
624 if (!other.is_undefined() && v.compare(other) >= 0) {
625 return false;
626 } else {
627 return true;
628 }
629 }
630
631 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
632
633 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
634 // Allow extensions to have priority
635 if (lookup_special_flag_ext(flag_name, flag)) {
636 return true;
637 }
638
639 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
640 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
641 flag = special_jvm_flags[i];
642 return true;
643 }
644 }
645 return false;
646 }
647
648 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
649 assert(version != NULL, "Must provide a version buffer");
650 SpecialFlag flag;
651 if (lookup_special_flag(flag_name, flag)) {
652 if (!flag.obsolete_in.is_undefined()) {
653 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
654 *version = flag.obsolete_in;
655 return true;
656 }
657 }
658 }
659 return false;
660 }
661
662 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
663 assert(version != NULL, "Must provide a version buffer");
664 SpecialFlag flag;
665 if (lookup_special_flag(flag_name, flag)) {
666 if (!flag.deprecated_in.is_undefined()) {
667 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
668 version_less_than(JDK_Version::current(), flag.expired_in)) {
669 *version = flag.deprecated_in;
670 return 1;
671 } else {
672 return -1;
673 }
674 }
675 }
676 return 0;
677 }
678
679 #ifndef PRODUCT
680 const char* Arguments::removed_develop_logging_flag_name(const char* name){
681 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
682 const AliasedFlag& flag = removed_develop_logging_flags[i];
683 if (strcmp(flag.alias_name, name) == 0) {
684 return flag.real_name;
685 }
686 }
687 return NULL;
688 }
689 #endif // PRODUCT
690
691 const char* Arguments::real_flag_name(const char *flag_name) {
692 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
693 const AliasedFlag& flag_status = aliased_jvm_flags[i];
694 if (strcmp(flag_status.alias_name, flag_name) == 0) {
695 return flag_status.real_name;
696 }
697 }
698 return flag_name;
699 }
700
701 #ifdef ASSERT
702 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
703 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
704 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
705 return true;
706 }
707 }
708 return false;
709 }
710
711 // Verifies the correctness of the entries in the special_jvm_flags table.
712 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
713 // version being earlier than the deprecation version, then a warning is issued
714 // and verification fails - by returning false. If it is detected that the table
715 // is out of date, with respect to the current version, then a warning is issued
716 // but verification does not fail. This allows the VM to operate when the version
717 // is first updated, without needing to update all the impacted flags at the
718 // same time.
719 static bool verify_special_jvm_flags() {
720 bool success = true;
721 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
722 const SpecialFlag& flag = special_jvm_flags[i];
723 if (lookup_special_flag(flag.name, i)) {
724 warning("Duplicate special flag declaration \"%s\"", flag.name);
725 success = false;
726 }
727 if (flag.deprecated_in.is_undefined() &&
728 flag.obsolete_in.is_undefined()) {
729 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
730 success = false;
731 }
732
733 if (!flag.deprecated_in.is_undefined()) {
734 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
735 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
736 success = false;
737 }
738
739 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
740 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
741 success = false;
742 }
743 }
744
745 if (!flag.obsolete_in.is_undefined()) {
746 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
747 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
748 success = false;
749 }
750
751 // if flag has become obsolete it should not have a "globals" flag defined anymore.
752 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
753 if (JVMFlag::find_flag(flag.name) != NULL) {
754 // Temporarily disable the warning: 8196739
755 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
756 }
757 }
758 }
759
760 if (!flag.expired_in.is_undefined()) {
761 // if flag has become expired it should not have a "globals" flag defined anymore.
762 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
763 if (JVMFlag::find_flag(flag.name) != NULL) {
764 // Temporarily disable the warning: 8196739
765 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
766 }
767 }
768 }
769
770 }
771 return success;
772 }
773 #endif
774
775 // Parses a size specification string.
776 bool Arguments::atojulong(const char *s, julong* result) {
777 julong n = 0;
778
779 // First char must be a digit. Don't allow negative numbers or leading spaces.
780 if (!isdigit(*s)) {
781 return false;
782 }
783
784 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
785 char* remainder;
786 errno = 0;
787 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
788 if (errno != 0) {
789 return false;
790 }
791
792 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
793 if (remainder == s || strlen(remainder) > 1) {
794 return false;
795 }
796
797 switch (*remainder) {
798 case 'T': case 't':
799 *result = n * G * K;
800 // Check for overflow.
801 if (*result/((julong)G * K) != n) return false;
802 return true;
803 case 'G': case 'g':
804 *result = n * G;
805 if (*result/G != n) return false;
806 return true;
807 case 'M': case 'm':
808 *result = n * M;
809 if (*result/M != n) return false;
810 return true;
811 case 'K': case 'k':
812 *result = n * K;
813 if (*result/K != n) return false;
814 return true;
815 case '\0':
816 *result = n;
817 return true;
818 default:
819 return false;
820 }
821 }
822
823 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
824 if (size < min_size) return arg_too_small;
825 if (size > max_size) return arg_too_big;
826 return arg_in_range;
827 }
828
829 // Describe an argument out of range error
830 void Arguments::describe_range_error(ArgsRange errcode) {
831 switch(errcode) {
832 case arg_too_big:
833 jio_fprintf(defaultStream::error_stream(),
834 "The specified size exceeds the maximum "
835 "representable size.\n");
836 break;
837 case arg_too_small:
838 case arg_unreadable:
839 case arg_in_range:
840 // do nothing for now
841 break;
842 default:
843 ShouldNotReachHere();
844 }
845 }
846
847 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
848 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
849 return true;
850 } else {
851 return false;
852 }
853 }
854
855 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
856 char* end;
857 errno = 0;
858 double v = strtod(value, &end);
859 if ((errno != 0) || (*end != 0)) {
860 return false;
861 }
862
863 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
864 return true;
865 }
866 return false;
867 }
868
869 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
870 julong v;
871 int int_v;
872 intx intx_v;
873 bool is_neg = false;
874 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
875
876 if (result == NULL) {
877 return false;
878 }
879
880 // Check the sign first since atojulong() parses only unsigned values.
881 if (*value == '-') {
882 if (!result->is_intx() && !result->is_int()) {
883 return false;
884 }
885 value++;
886 is_neg = true;
887 }
888 if (!Arguments::atojulong(value, &v)) {
889 return false;
890 }
891 if (result->is_int()) {
892 int_v = (int) v;
893 if (is_neg) {
894 int_v = -int_v;
895 }
896 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
897 } else if (result->is_uint()) {
898 uint uint_v = (uint) v;
899 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
900 } else if (result->is_intx()) {
901 intx_v = (intx) v;
902 if (is_neg) {
903 intx_v = -intx_v;
904 }
905 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
906 } else if (result->is_uintx()) {
907 uintx uintx_v = (uintx) v;
908 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
909 } else if (result->is_uint64_t()) {
910 uint64_t uint64_t_v = (uint64_t) v;
911 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
912 } else if (result->is_size_t()) {
913 size_t size_t_v = (size_t) v;
914 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
915 } else if (result->is_double()) {
916 double double_v = (double) v;
917 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
918 } else {
919 return false;
920 }
921 }
922
923 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
924 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
925 // Contract: JVMFlag always returns a pointer that needs freeing.
926 FREE_C_HEAP_ARRAY(char, value);
927 return true;
928 }
929
930 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
931 const char* old_value = "";
932 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
933 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
934 size_t new_len = strlen(new_value);
935 const char* value;
936 char* free_this_too = NULL;
937 if (old_len == 0) {
938 value = new_value;
939 } else if (new_len == 0) {
940 value = old_value;
941 } else {
942 size_t length = old_len + 1 + new_len + 1;
943 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
944 // each new setting adds another LINE to the switch:
945 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
946 value = buf;
947 free_this_too = buf;
948 }
949 (void) JVMFlag::ccstrAtPut(name, &value, origin);
950 // JVMFlag always returns a pointer that needs freeing.
951 FREE_C_HEAP_ARRAY(char, value);
952 if (free_this_too != NULL) {
953 // JVMFlag made its own copy, so I must delete my own temp. buffer.
954 FREE_C_HEAP_ARRAY(char, free_this_too);
955 }
956 return true;
957 }
958
959 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
960 const char* real_name = real_flag_name(arg);
961 JDK_Version since = JDK_Version();
962 switch (is_deprecated_flag(arg, &since)) {
963 case -1:
964 return NULL; // obsolete or expired, don't process normally
965 case 0:
966 return real_name;
967 case 1: {
968 if (warn) {
969 char version[256];
970 since.to_string(version, sizeof(version));
971 if (real_name != arg) {
972 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
973 arg, version, real_name);
974 } else {
975 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
976 arg, version);
977 }
978 }
979 return real_name;
980 }
981 }
982 ShouldNotReachHere();
983 return NULL;
984 }
985
986 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
987 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
988 // Set tagset string buffer at max size of 256, large enough for any alias tagset
989 const int max_tagset_size = 256;
990 int max_tagset_len = max_tagset_size - 1;
991 char tagset_buffer[max_tagset_size];
992 tagset_buffer[0] = '\0';
993
994 // Write tag-set for aliased logging option, in string list form
995 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
996 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
997 if (i > 0) {
998 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
999 }
1000 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1001 }
1002 if (!alf.exactMatch) {
1003 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1004 }
1005 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1006 (on) ? "+" : "-",
1007 name,
1008 tagset_buffer,
1009 (on) ? LogLevel::name(alf.level) : "off");
1010 }
1011
1012 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1013 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1014 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1015 if (strcmp(alf.alias_name, name) == 0) {
1016 log_deprecated_flag(name, on, alf);
1017 return alf;
1018 }
1019 }
1020 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1021 return a;
1022 }
1023
1024 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1025
1026 // range of acceptable characters spelled out for portability reasons
1027 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1028 #define BUFLEN 255
1029 char name[BUFLEN+1];
1030 char dummy;
1031 const char* real_name;
1032 bool warn_if_deprecated = true;
1033
1034 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1035 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1036 if (alf.alias_name != NULL){
1037 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1038 return true;
1039 }
1040 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1041 if (real_name == NULL) {
1042 return false;
1043 }
1044 return set_bool_flag(real_name, false, origin);
1045 }
1046 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1047 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1048 if (alf.alias_name != NULL){
1049 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1050 return true;
1051 }
1052 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1053 if (real_name == NULL) {
1054 return false;
1055 }
1056 return set_bool_flag(real_name, true, origin);
1057 }
1058
1059 char punct;
1060 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1061 const char* value = strchr(arg, '=') + 1;
1062 JVMFlag* flag;
1063
1064 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1065 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1066 if (alf.alias_name != NULL) {
1067 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1068 return true;
1069 }
1070 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1071 if (real_name == NULL) {
1072 return false;
1073 }
1074 flag = JVMFlag::find_flag(real_name);
1075 if (flag != NULL && flag->is_ccstr()) {
1076 if (flag->ccstr_accumulates()) {
1077 return append_to_string_flag(real_name, value, origin);
1078 } else {
1079 if (value[0] == '\0') {
1080 value = NULL;
1081 }
1082 return set_string_flag(real_name, value, origin);
1083 }
1084 } else {
1085 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1086 }
1087 }
1088
1089 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1090 const char* value = strchr(arg, '=') + 1;
1091 // -XX:Foo:=xxx will reset the string flag to the given value.
1092 if (value[0] == '\0') {
1093 value = NULL;
1094 }
1095 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1096 if (real_name == NULL) {
1097 return false;
1098 }
1099 return set_string_flag(real_name, value, origin);
1100 }
1101
1102 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1103 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1104 #define NUMBER_RANGE "[0123456789eE+-]"
1105 char value[BUFLEN + 1];
1106 char value2[BUFLEN + 1];
1107 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1108 // Looks like a floating-point number -- try again with more lenient format string
1109 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1110 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1111 if (real_name == NULL) {
1112 return false;
1113 }
1114 return set_fp_numeric_flag(real_name, value, origin);
1115 }
1116 }
1117
1118 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1119 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1120 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1121 if (real_name == NULL) {
1122 return false;
1123 }
1124 return set_numeric_flag(real_name, value, origin);
1125 }
1126
1127 return false;
1128 }
1129
1130 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1131 assert(bldarray != NULL, "illegal argument");
1132
1133 if (arg == NULL) {
1134 return;
1135 }
1136
1137 int new_count = *count + 1;
1138
1139 // expand the array and add arg to the last element
1140 if (*bldarray == NULL) {
1141 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1142 } else {
1143 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1144 }
1145 (*bldarray)[*count] = os::strdup_check_oom(arg);
1146 *count = new_count;
1147 }
1148
1149 void Arguments::build_jvm_args(const char* arg) {
1150 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1151 }
1152
1153 void Arguments::build_jvm_flags(const char* arg) {
1154 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1155 }
1156
1157 // utility function to return a string that concatenates all
1158 // strings in a given char** array
1159 const char* Arguments::build_resource_string(char** args, int count) {
1160 if (args == NULL || count == 0) {
1161 return NULL;
1162 }
1163 size_t length = 0;
1164 for (int i = 0; i < count; i++) {
1165 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1166 }
1167 char* s = NEW_RESOURCE_ARRAY(char, length);
1168 char* dst = s;
1169 for (int j = 0; j < count; j++) {
1170 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1171 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1172 dst += offset;
1173 length -= offset;
1174 }
1175 return (const char*) s;
1176 }
1177
1178 void Arguments::print_on(outputStream* st) {
1179 st->print_cr("VM Arguments:");
1180 if (num_jvm_flags() > 0) {
1181 st->print("jvm_flags: "); print_jvm_flags_on(st);
1182 st->cr();
1183 }
1184 if (num_jvm_args() > 0) {
1185 st->print("jvm_args: "); print_jvm_args_on(st);
1186 st->cr();
1187 }
1188 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1189 if (_java_class_path != NULL) {
1190 char* path = _java_class_path->value();
1191 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1192 }
1193 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1194 }
1195
1196 void Arguments::print_summary_on(outputStream* st) {
1197 // Print the command line. Environment variables that are helpful for
1198 // reproducing the problem are written later in the hs_err file.
1199 // flags are from setting file
1200 if (num_jvm_flags() > 0) {
1201 st->print_raw("Settings File: ");
1202 print_jvm_flags_on(st);
1203 st->cr();
1204 }
1205 // args are the command line and environment variable arguments.
1206 st->print_raw("Command Line: ");
1207 if (num_jvm_args() > 0) {
1208 print_jvm_args_on(st);
1209 }
1210 // this is the classfile and any arguments to the java program
1211 if (java_command() != NULL) {
1212 st->print("%s", java_command());
1213 }
1214 st->cr();
1215 }
1216
1217 void Arguments::print_jvm_flags_on(outputStream* st) {
1218 if (_num_jvm_flags > 0) {
1219 for (int i=0; i < _num_jvm_flags; i++) {
1220 st->print("%s ", _jvm_flags_array[i]);
1221 }
1222 }
1223 }
1224
1225 void Arguments::print_jvm_args_on(outputStream* st) {
1226 if (_num_jvm_args > 0) {
1227 for (int i=0; i < _num_jvm_args; i++) {
1228 st->print("%s ", _jvm_args_array[i]);
1229 }
1230 }
1231 }
1232
1233 bool Arguments::process_argument(const char* arg,
1234 jboolean ignore_unrecognized,
1235 JVMFlag::Flags origin) {
1236 JDK_Version since = JDK_Version();
1237
1238 if (parse_argument(arg, origin)) {
1239 return true;
1240 }
1241
1242 // Determine if the flag has '+', '-', or '=' characters.
1243 bool has_plus_minus = (*arg == '+' || *arg == '-');
1244 const char* const argname = has_plus_minus ? arg + 1 : arg;
1245
1246 size_t arg_len;
1247 const char* equal_sign = strchr(argname, '=');
1248 if (equal_sign == NULL) {
1249 arg_len = strlen(argname);
1250 } else {
1251 arg_len = equal_sign - argname;
1252 }
1253
1254 // Only make the obsolete check for valid arguments.
1255 if (arg_len <= BUFLEN) {
1256 // Construct a string which consists only of the argument name without '+', '-', or '='.
1257 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1258 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1259 if (is_obsolete_flag(stripped_argname, &since)) {
1260 char version[256];
1261 since.to_string(version, sizeof(version));
1262 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1263 return true;
1264 }
1265 #ifndef PRODUCT
1266 else {
1267 const char* replacement;
1268 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1269 log_warning(arguments)("%s has been removed. Please use %s instead.",
1270 stripped_argname,
1271 replacement);
1272 return false;
1273 }
1274 }
1275 #endif //PRODUCT
1276 }
1277
1278 // For locked flags, report a custom error message if available.
1279 // Otherwise, report the standard unrecognized VM option.
1280 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1281 if (found_flag != NULL) {
1282 char locked_message_buf[BUFLEN];
1283 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1284 if (strlen(locked_message_buf) == 0) {
1285 if (found_flag->is_bool() && !has_plus_minus) {
1286 jio_fprintf(defaultStream::error_stream(),
1287 "Missing +/- setting for VM option '%s'\n", argname);
1288 } else if (!found_flag->is_bool() && has_plus_minus) {
1289 jio_fprintf(defaultStream::error_stream(),
1290 "Unexpected +/- setting in VM option '%s'\n", argname);
1291 } else {
1292 jio_fprintf(defaultStream::error_stream(),
1293 "Improperly specified VM option '%s'\n", argname);
1294 }
1295 } else {
1296 #ifdef PRODUCT
1297 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1298 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1299 if (ignore_unrecognized && mismatched) {
1300 return true;
1301 }
1302 #endif
1303 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1304 }
1305 } else {
1306 if (ignore_unrecognized) {
1307 return true;
1308 }
1309 jio_fprintf(defaultStream::error_stream(),
1310 "Unrecognized VM option '%s'\n", argname);
1311 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1312 if (fuzzy_matched != NULL) {
1313 jio_fprintf(defaultStream::error_stream(),
1314 "Did you mean '%s%s%s'? ",
1315 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1316 fuzzy_matched->_name,
1317 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1318 }
1319 }
1320
1321 // allow for commandline "commenting out" options like -XX:#+Verbose
1322 return arg[0] == '#';
1323 }
1324
1325 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1326 FILE* stream = fopen(file_name, "rb");
1327 if (stream == NULL) {
1328 if (should_exist) {
1329 jio_fprintf(defaultStream::error_stream(),
1330 "Could not open settings file %s\n", file_name);
1331 return false;
1332 } else {
1333 return true;
1334 }
1335 }
1336
1337 char token[1024];
1338 int pos = 0;
1339
1340 bool in_white_space = true;
1341 bool in_comment = false;
1342 bool in_quote = false;
1343 char quote_c = 0;
1344 bool result = true;
1345
1346 int c = getc(stream);
1347 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1348 if (in_white_space) {
1349 if (in_comment) {
1350 if (c == '\n') in_comment = false;
1351 } else {
1352 if (c == '#') in_comment = true;
1353 else if (!isspace(c)) {
1354 in_white_space = false;
1355 token[pos++] = c;
1356 }
1357 }
1358 } else {
1359 if (c == '\n' || (!in_quote && isspace(c))) {
1360 // token ends at newline, or at unquoted whitespace
1361 // this allows a way to include spaces in string-valued options
1362 token[pos] = '\0';
1363 logOption(token);
1364 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1365 build_jvm_flags(token);
1366 pos = 0;
1367 in_white_space = true;
1368 in_quote = false;
1369 } else if (!in_quote && (c == '\'' || c == '"')) {
1370 in_quote = true;
1371 quote_c = c;
1372 } else if (in_quote && (c == quote_c)) {
1373 in_quote = false;
1374 } else {
1375 token[pos++] = c;
1376 }
1377 }
1378 c = getc(stream);
1379 }
1380 if (pos > 0) {
1381 token[pos] = '\0';
1382 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1383 build_jvm_flags(token);
1384 }
1385 fclose(stream);
1386 return result;
1387 }
1388
1389 //=============================================================================================================
1390 // Parsing of properties (-D)
1391
1392 const char* Arguments::get_property(const char* key) {
1393 return PropertyList_get_value(system_properties(), key);
1394 }
1395
1396 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1397 const char* eq = strchr(prop, '=');
1398 const char* key;
1399 const char* value = "";
1400
1401 if (eq == NULL) {
1402 // property doesn't have a value, thus use passed string
1403 key = prop;
1404 } else {
1405 // property have a value, thus extract it and save to the
1406 // allocated string
1407 size_t key_len = eq - prop;
1408 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1409
1410 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1411 key = tmp_key;
1412
1413 value = &prop[key_len + 1];
1414 }
1415
1416 if (strcmp(key, "java.compiler") == 0) {
1417 process_java_compiler_argument(value);
1418 // Record value in Arguments, but let it get passed to Java.
1419 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1420 strcmp(key, "sun.java.launcher.pid") == 0) {
1421 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1422 // private and are processed in process_sun_java_launcher_properties();
1423 // the sun.java.launcher property is passed on to the java application
1424 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1425 // append is true, writable is true, internal is false
1426 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1427 WriteableProperty, ExternalProperty);
1428 } else {
1429 if (strcmp(key, "sun.java.command") == 0) {
1430 char *old_java_command = _java_command;
1431 _java_command = os::strdup_check_oom(value, mtArguments);
1432 if (old_java_command != NULL) {
1433 os::free(old_java_command);
1434 }
1435 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1436 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1437 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1438 // its value without going through the property list or making a Java call.
1439 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1440 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1441 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1442 os::free((void *)old_java_vendor_url_bug);
1443 }
1444 }
1445
1446 // Create new property and add at the end of the list
1447 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1448 }
1449
1450 if (key != prop) {
1451 // SystemProperty copy passed value, thus free previously allocated
1452 // memory
1453 FreeHeap((void *)key);
1454 }
1455
1456 return true;
1457 }
1458
1459 #if INCLUDE_CDS
1460 const char* unsupported_properties[] = { "jdk.module.limitmods",
1461 "jdk.module.upgrade.path",
1462 "jdk.module.patch.0" };
1463 const char* unsupported_options[] = { "--limit-modules",
1464 "--upgrade-module-path",
1465 "--patch-module"
1466 };
1467 void Arguments::check_unsupported_dumping_properties() {
1468 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1469 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1470 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1471 SystemProperty* sp = system_properties();
1472 while (sp != NULL) {
1473 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1474 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1475 vm_exit_during_initialization(
1476 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1477 }
1478 }
1479 sp = sp->next();
1480 }
1481
1482 // Check for an exploded module build in use with -Xshare:dump.
1483 if (!has_jimage()) {
1484 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1485 }
1486 }
1487
1488 bool Arguments::check_unsupported_cds_runtime_properties() {
1489 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1490 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1491 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1492 if (get_property(unsupported_properties[i]) != NULL) {
1493 if (RequireSharedSpaces) {
1494 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1495 }
1496 return true;
1497 }
1498 }
1499 return false;
1500 }
1501 #endif
1502
1503 //===========================================================================================================
1504 // Setting int/mixed/comp mode flags
1505
1506 void Arguments::set_mode_flags(Mode mode) {
1507 // Set up default values for all flags.
1508 // If you add a flag to any of the branches below,
1509 // add a default value for it here.
1510 set_java_compiler(false);
1511 _mode = mode;
1512
1513 // Ensure Agent_OnLoad has the correct initial values.
1514 // This may not be the final mode; mode may change later in onload phase.
1515 PropertyList_unique_add(&_system_properties, "java.vm.info",
1516 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1517
1518 UseInterpreter = true;
1519 UseCompiler = true;
1520 UseLoopCounter = true;
1521
1522 // Default values may be platform/compiler dependent -
1523 // use the saved values
1524 ClipInlining = Arguments::_ClipInlining;
1525 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1526 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1527 BackgroundCompilation = Arguments::_BackgroundCompilation;
1528 if (TieredCompilation) {
1529 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1530 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1531 }
1532 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1533 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1534 }
1535 }
1536
1537 // Change from defaults based on mode
1538 switch (mode) {
1539 default:
1540 ShouldNotReachHere();
1541 break;
1542 case _int:
1543 UseCompiler = false;
1544 UseLoopCounter = false;
1545 AlwaysCompileLoopMethods = false;
1546 UseOnStackReplacement = false;
1547 break;
1548 case _mixed:
1549 // same as default
1550 break;
1551 case _comp:
1552 UseInterpreter = false;
1553 BackgroundCompilation = false;
1554 ClipInlining = false;
1555 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1556 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1557 // compile a level 4 (C2) and then continue executing it.
1558 if (TieredCompilation) {
1559 Tier3InvokeNotifyFreqLog = 0;
1560 Tier4InvocationThreshold = 0;
1561 }
1562 break;
1563 }
1564 }
1565
1566 // Conflict: required to use shared spaces (-Xshare:on), but
1567 // incompatible command line options were chosen.
1568 static void no_shared_spaces(const char* message) {
1569 if (RequireSharedSpaces) {
1570 jio_fprintf(defaultStream::error_stream(),
1571 "Class data sharing is inconsistent with other specified options.\n");
1572 vm_exit_during_initialization("Unable to use shared archive", message);
1573 } else {
1574 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1575 }
1576 }
1577
1578 void set_object_alignment() {
1579 // Object alignment.
1580 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1581 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1582 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1583 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1584 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1585 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1586
1587 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1588 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1589
1590 // Oop encoding heap max
1591 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1592
1593 if (SurvivorAlignmentInBytes == 0) {
1594 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1595 }
1596 }
1597
1598 size_t Arguments::max_heap_for_compressed_oops() {
1599 // Avoid sign flip.
1600 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1601 // We need to fit both the NULL page and the heap into the memory budget, while
1602 // keeping alignment constraints of the heap. To guarantee the latter, as the
1603 // NULL page is located before the heap, we pad the NULL page to the conservative
1604 // maximum alignment that the GC may ever impose upon the heap.
1605 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1606 _conservative_max_heap_alignment);
1607
1608 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1609 NOT_LP64(ShouldNotReachHere(); return 0);
1610 }
1611
1612 void Arguments::set_use_compressed_oops() {
1613 #ifndef ZERO
1614 #ifdef _LP64
1615 // MaxHeapSize is not set up properly at this point, but
1616 // the only value that can override MaxHeapSize if we are
1617 // to use UseCompressedOops is InitialHeapSize.
1618 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1619
1620 if (max_heap_size <= max_heap_for_compressed_oops()) {
1621 #if !defined(COMPILER1) || defined(TIERED)
1622 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1623 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1624 }
1625 #endif
1626 } else {
1627 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1628 warning("Max heap size too large for Compressed Oops");
1629 FLAG_SET_DEFAULT(UseCompressedOops, false);
1630 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1631 }
1632 }
1633 #endif // _LP64
1634 #endif // ZERO
1635 }
1636
1637
1638 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1639 // set_use_compressed_oops().
1640 void Arguments::set_use_compressed_klass_ptrs() {
1641 #ifndef ZERO
1642 #ifdef _LP64
1643 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1644 if (!UseCompressedOops) {
1645 if (UseCompressedClassPointers) {
1646 warning("UseCompressedClassPointers requires UseCompressedOops");
1647 }
1648 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1649 } else {
1650 // Turn on UseCompressedClassPointers too
1651 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1652 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1653 }
1654 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1655 if (UseCompressedClassPointers) {
1656 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1657 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1658 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1659 }
1660 }
1661 }
1662 #endif // _LP64
1663 #endif // !ZERO
1664 }
1665
1666 void Arguments::set_conservative_max_heap_alignment() {
1667 // The conservative maximum required alignment for the heap is the maximum of
1668 // the alignments imposed by several sources: any requirements from the heap
1669 // itself, the collector policy and the maximum page size we may run the VM
1670 // with.
1671 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1672 _conservative_max_heap_alignment = MAX4(heap_alignment,
1673 (size_t)os::vm_allocation_granularity(),
1674 os::max_page_size(),
1675 CollectorPolicy::compute_heap_alignment());
1676 }
1677
1678 jint Arguments::set_ergonomics_flags() {
1679 GCConfig::initialize();
1680
1681 set_conservative_max_heap_alignment();
1682
1683 #ifndef ZERO
1684 #ifdef _LP64
1685 set_use_compressed_oops();
1686
1687 // set_use_compressed_klass_ptrs() must be called after calling
1688 // set_use_compressed_oops().
1689 set_use_compressed_klass_ptrs();
1690
1691 // Also checks that certain machines are slower with compressed oops
1692 // in vm_version initialization code.
1693 #endif // _LP64
1694 #endif // !ZERO
1695
1696 return JNI_OK;
1697 }
1698
1699 julong Arguments::limit_by_allocatable_memory(julong limit) {
1700 julong max_allocatable;
1701 julong result = limit;
1702 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1703 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1704 }
1705 return result;
1706 }
1707
1708 // Use static initialization to get the default before parsing
1709 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1710
1711 void Arguments::set_heap_size() {
1712 julong phys_mem =
1713 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1714 : (julong)MaxRAM;
1715
1716 // Convert deprecated flags
1717 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1718 !FLAG_IS_DEFAULT(MaxRAMFraction))
1719 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1720
1721 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1722 !FLAG_IS_DEFAULT(MinRAMFraction))
1723 MinRAMPercentage = 100.0 / MinRAMFraction;
1724
1725 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1726 !FLAG_IS_DEFAULT(InitialRAMFraction))
1727 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1728
1729 // If the maximum heap size has not been set with -Xmx,
1730 // then set it as fraction of the size of physical memory,
1731 // respecting the maximum and minimum sizes of the heap.
1732 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1733 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1734 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1735 if (reasonable_min < MaxHeapSize) {
1736 // Small physical memory, so use a minimum fraction of it for the heap
1737 reasonable_max = reasonable_min;
1738 } else {
1739 // Not-small physical memory, so require a heap at least
1740 // as large as MaxHeapSize
1741 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1742 }
1743
1744 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1745 // Limit the heap size to ErgoHeapSizeLimit
1746 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1747 }
1748 if (UseCompressedOops) {
1749 // Limit the heap size to the maximum possible when using compressed oops
1750 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1751
1752 // HeapBaseMinAddress can be greater than default but not less than.
1753 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1754 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1755 // matches compressed oops printing flags
1756 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1757 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1758 DefaultHeapBaseMinAddress,
1759 DefaultHeapBaseMinAddress/G,
1760 HeapBaseMinAddress);
1761 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1762 }
1763 }
1764
1765 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1766 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1767 // but it should be not less than default MaxHeapSize.
1768 max_coop_heap -= HeapBaseMinAddress;
1769 }
1770 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1771 }
1772 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1773
1774 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1775 // An initial heap size was specified on the command line,
1776 // so be sure that the maximum size is consistent. Done
1777 // after call to limit_by_allocatable_memory because that
1778 // method might reduce the allocation size.
1779 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1780 }
1781
1782 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1783 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1784 }
1785
1786 // If the minimum or initial heap_size have not been set or requested to be set
1787 // ergonomically, set them accordingly.
1788 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1789 julong reasonable_minimum = (julong)(OldSize + NewSize);
1790
1791 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1792
1793 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1794
1795 if (InitialHeapSize == 0) {
1796 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1797
1798 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1799 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1800
1801 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1802
1803 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1804 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1805 }
1806 // If the minimum heap size has not been set (via -Xms),
1807 // synchronize with InitialHeapSize to avoid errors with the default value.
1808 if (min_heap_size() == 0) {
1809 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1810 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1811 }
1812 }
1813 }
1814
1815 // This option inspects the machine and attempts to set various
1816 // parameters to be optimal for long-running, memory allocation
1817 // intensive jobs. It is intended for machines with large
1818 // amounts of cpu and memory.
1819 jint Arguments::set_aggressive_heap_flags() {
1820 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1821 // VM, but we may not be able to represent the total physical memory
1822 // available (like having 8gb of memory on a box but using a 32bit VM).
1823 // Thus, we need to make sure we're using a julong for intermediate
1824 // calculations.
1825 julong initHeapSize;
1826 julong total_memory = os::physical_memory();
1827
1828 if (total_memory < (julong) 256 * M) {
1829 jio_fprintf(defaultStream::error_stream(),
1830 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1831 vm_exit(1);
1832 }
1833
1834 // The heap size is half of available memory, or (at most)
1835 // all of possible memory less 160mb (leaving room for the OS
1836 // when using ISM). This is the maximum; because adaptive sizing
1837 // is turned on below, the actual space used may be smaller.
1838
1839 initHeapSize = MIN2(total_memory / (julong) 2,
1840 total_memory - (julong) 160 * M);
1841
1842 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1843
1844 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1845 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1846 return JNI_EINVAL;
1847 }
1848 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1849 return JNI_EINVAL;
1850 }
1851 // Currently the minimum size and the initial heap sizes are the same.
1852 set_min_heap_size(initHeapSize);
1853 }
1854 if (FLAG_IS_DEFAULT(NewSize)) {
1855 // Make the young generation 3/8ths of the total heap.
1856 if (FLAG_SET_CMDLINE(size_t, NewSize,
1857 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1858 return JNI_EINVAL;
1859 }
1860 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1861 return JNI_EINVAL;
1862 }
1863 }
1864
1865 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1866 FLAG_SET_DEFAULT(UseLargePages, true);
1867 #endif
1868
1869 // Increase some data structure sizes for efficiency
1870 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1871 return JNI_EINVAL;
1872 }
1873 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
1874 return JNI_EINVAL;
1875 }
1876 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1877 return JNI_EINVAL;
1878 }
1879
1880 // See the OldPLABSize comment below, but replace 'after promotion'
1881 // with 'after copying'. YoungPLABSize is the size of the survivor
1882 // space per-gc-thread buffers. The default is 4kw.
1883 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1884 return JNI_EINVAL;
1885 }
1886
1887 // OldPLABSize is the size of the buffers in the old gen that
1888 // UseParallelGC uses to promote live data that doesn't fit in the
1889 // survivor spaces. At any given time, there's one for each gc thread.
1890 // The default size is 1kw. These buffers are rarely used, since the
1891 // survivor spaces are usually big enough. For specjbb, however, there
1892 // are occasions when there's lots of live data in the young gen
1893 // and we end up promoting some of it. We don't have a definite
1894 // explanation for why bumping OldPLABSize helps, but the theory
1895 // is that a bigger PLAB results in retaining something like the
1896 // original allocation order after promotion, which improves mutator
1897 // locality. A minor effect may be that larger PLABs reduce the
1898 // number of PLAB allocation events during gc. The value of 8kw
1899 // was arrived at by experimenting with specjbb.
1900 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1901 return JNI_EINVAL;
1902 }
1903
1904 // Enable parallel GC and adaptive generation sizing
1905 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
1906 return JNI_EINVAL;
1907 }
1908
1909 // Encourage steady state memory management
1910 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1911 return JNI_EINVAL;
1912 }
1913
1914 // This appears to improve mutator locality
1915 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1916 return JNI_EINVAL;
1917 }
1918
1919 // Get around early Solaris scheduling bug
1920 // (affinity vs other jobs on system)
1921 // but disallow DR and offlining (5008695).
1922 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1923 return JNI_EINVAL;
1924 }
1925
1926 return JNI_OK;
1927 }
1928
1929 // This must be called after ergonomics.
1930 void Arguments::set_bytecode_flags() {
1931 if (!RewriteBytecodes) {
1932 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1933 }
1934 }
1935
1936 // Aggressive optimization flags
1937 jint Arguments::set_aggressive_opts_flags() {
1938 #ifdef COMPILER2
1939 if (AggressiveUnboxing) {
1940 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1941 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1942 } else if (!EliminateAutoBox) {
1943 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1944 AggressiveUnboxing = false;
1945 }
1946 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1947 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1948 } else if (!DoEscapeAnalysis) {
1949 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1950 AggressiveUnboxing = false;
1951 }
1952 }
1953 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1954 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1955 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1956 }
1957 // Feed the cache size setting into the JDK
1958 char buffer[1024];
1959 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1960 if (!add_property(buffer)) {
1961 return JNI_ENOMEM;
1962 }
1963 }
1964 #endif
1965
1966 return JNI_OK;
1967 }
1968
1969 //===========================================================================================================
1970 // Parsing of java.compiler property
1971
1972 void Arguments::process_java_compiler_argument(const char* arg) {
1973 // For backwards compatibility, Djava.compiler=NONE or ""
1974 // causes us to switch to -Xint mode UNLESS -Xdebug
1975 // is also specified.
1976 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1977 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1978 }
1979 }
1980
1981 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1982 _sun_java_launcher = os::strdup_check_oom(launcher);
1983 }
1984
1985 bool Arguments::created_by_java_launcher() {
1986 assert(_sun_java_launcher != NULL, "property must have value");
1987 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1988 }
1989
1990 bool Arguments::sun_java_launcher_is_altjvm() {
1991 return _sun_java_launcher_is_altjvm;
1992 }
1993
1994 //===========================================================================================================
1995 // Parsing of main arguments
1996
1997 unsigned int addreads_count = 0;
1998 unsigned int addexports_count = 0;
1999 unsigned int addopens_count = 0;
2000 unsigned int addmods_count = 0;
2001 unsigned int patch_mod_count = 0;
2002
2003 // Check the consistency of vm_init_args
2004 bool Arguments::check_vm_args_consistency() {
2005 // Method for adding checks for flag consistency.
2006 // The intent is to warn the user of all possible conflicts,
2007 // before returning an error.
2008 // Note: Needs platform-dependent factoring.
2009 bool status = true;
2010
2011 if (TLABRefillWasteFraction == 0) {
2012 jio_fprintf(defaultStream::error_stream(),
2013 "TLABRefillWasteFraction should be a denominator, "
2014 "not " SIZE_FORMAT "\n",
2015 TLABRefillWasteFraction);
2016 status = false;
2017 }
2018
2019 if (PrintNMTStatistics) {
2020 #if INCLUDE_NMT
2021 if (MemTracker::tracking_level() == NMT_off) {
2022 #endif // INCLUDE_NMT
2023 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2024 PrintNMTStatistics = false;
2025 #if INCLUDE_NMT
2026 }
2027 #endif
2028 }
2029
2030 status = CompilerConfig::check_args_consistency(status);
2031 #if INCLUDE_JVMCI
2032 if (status && EnableJVMCI) {
2033 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2034 AddProperty, UnwriteableProperty, InternalProperty);
2035 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2036 return false;
2037 }
2038 }
2039 #endif
2040
2041 #ifndef SUPPORT_RESERVED_STACK_AREA
2042 if (StackReservedPages != 0) {
2043 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2044 warning("Reserved Stack Area not supported on this platform");
2045 }
2046 #endif
2047
2048 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2049 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2050 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2051 }
2052 }
2053
2054 status = status && GCArguments::check_args_consistency();
2055
2056 return status;
2057 }
2058
2059 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2060 const char* option_type) {
2061 if (ignore) return false;
2062
2063 const char* spacer = " ";
2064 if (option_type == NULL) {
2065 option_type = ++spacer; // Set both to the empty string.
2066 }
2067
2068 jio_fprintf(defaultStream::error_stream(),
2069 "Unrecognized %s%soption: %s\n", option_type, spacer,
2070 option->optionString);
2071 return true;
2072 }
2073
2074 static const char* user_assertion_options[] = {
2075 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2076 };
2077
2078 static const char* system_assertion_options[] = {
2079 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2080 };
2081
2082 bool Arguments::parse_uintx(const char* value,
2083 uintx* uintx_arg,
2084 uintx min_size) {
2085
2086 // Check the sign first since atojulong() parses only unsigned values.
2087 bool value_is_positive = !(*value == '-');
2088
2089 if (value_is_positive) {
2090 julong n;
2091 bool good_return = atojulong(value, &n);
2092 if (good_return) {
2093 bool above_minimum = n >= min_size;
2094 bool value_is_too_large = n > max_uintx;
2095
2096 if (above_minimum && !value_is_too_large) {
2097 *uintx_arg = n;
2098 return true;
2099 }
2100 }
2101 }
2102 return false;
2103 }
2104
2105 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2106 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2107 char* property = AllocateHeap(prop_len, mtArguments);
2108 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2109 if (ret < 0 || ret >= (int)prop_len) {
2110 FreeHeap(property);
2111 return false;
2112 }
2113 bool added = add_property(property, UnwriteableProperty, internal);
2114 FreeHeap(property);
2115 return added;
2116 }
2117
2118 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2119 const unsigned int props_count_limit = 1000;
2120 const int max_digits = 3;
2121 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2122
2123 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2124 if (count < props_count_limit) {
2125 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2126 char* property = AllocateHeap(prop_len, mtArguments);
2127 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2128 if (ret < 0 || ret >= (int)prop_len) {
2129 FreeHeap(property);
2130 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2131 return false;
2132 }
2133 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2134 FreeHeap(property);
2135 return added;
2136 }
2137
2138 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2139 return false;
2140 }
2141
2142 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2143 julong* long_arg,
2144 julong min_size,
2145 julong max_size) {
2146 if (!atojulong(s, long_arg)) return arg_unreadable;
2147 return check_memory_size(*long_arg, min_size, max_size);
2148 }
2149
2150 // Parse JavaVMInitArgs structure
2151
2152 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2153 const JavaVMInitArgs *java_options_args,
2154 const JavaVMInitArgs *cmd_line_args) {
2155 bool patch_mod_javabase = false;
2156
2157 // Save default settings for some mode flags
2158 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2159 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2160 Arguments::_ClipInlining = ClipInlining;
2161 Arguments::_BackgroundCompilation = BackgroundCompilation;
2162 if (TieredCompilation) {
2163 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2164 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2165 }
2166
2167 // Setup flags for mixed which is the default
2168 set_mode_flags(_mixed);
2169
2170 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2171 // variable (if present).
2172 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2173 if (result != JNI_OK) {
2174 return result;
2175 }
2176
2177 // Parse args structure generated from the command line flags.
2178 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2179 if (result != JNI_OK) {
2180 return result;
2181 }
2182
2183 // Parse args structure generated from the _JAVA_OPTIONS environment
2184 // variable (if present) (mimics classic VM)
2185 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2186 if (result != JNI_OK) {
2187 return result;
2188 }
2189
2190 // We need to ensure processor and memory resources have been properly
2191 // configured - which may rely on arguments we just processed - before
2192 // doing the final argument processing. Any argument processing that
2193 // needs to know about processor and memory resources must occur after
2194 // this point.
2195
2196 os::init_container_support();
2197
2198 // Do final processing now that all arguments have been parsed
2199 result = finalize_vm_init_args(patch_mod_javabase);
2200 if (result != JNI_OK) {
2201 return result;
2202 }
2203
2204 return JNI_OK;
2205 }
2206
2207 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2208 // represents a valid JDWP agent. is_path==true denotes that we
2209 // are dealing with -agentpath (case where name is a path), otherwise with
2210 // -agentlib
2211 bool valid_jdwp_agent(char *name, bool is_path) {
2212 char *_name;
2213 const char *_jdwp = "jdwp";
2214 size_t _len_jdwp, _len_prefix;
2215
2216 if (is_path) {
2217 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2218 return false;
2219 }
2220
2221 _name++; // skip past last path separator
2222 _len_prefix = strlen(JNI_LIB_PREFIX);
2223
2224 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2225 return false;
2226 }
2227
2228 _name += _len_prefix;
2229 _len_jdwp = strlen(_jdwp);
2230
2231 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2232 _name += _len_jdwp;
2233 }
2234 else {
2235 return false;
2236 }
2237
2238 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2239 return false;
2240 }
2241
2242 return true;
2243 }
2244
2245 if (strcmp(name, _jdwp) == 0) {
2246 return true;
2247 }
2248
2249 return false;
2250 }
2251
2252 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2253 // --patch-module=<module>=<file>(<pathsep><file>)*
2254 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2255 // Find the equal sign between the module name and the path specification
2256 const char* module_equal = strchr(patch_mod_tail, '=');
2257 if (module_equal == NULL) {
2258 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2259 return JNI_ERR;
2260 } else {
2261 // Pick out the module name
2262 size_t module_len = module_equal - patch_mod_tail;
2263 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2264 if (module_name != NULL) {
2265 memcpy(module_name, patch_mod_tail, module_len);
2266 *(module_name + module_len) = '\0';
2267 // The path piece begins one past the module_equal sign
2268 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2269 FREE_C_HEAP_ARRAY(char, module_name);
2270 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2271 return JNI_ENOMEM;
2272 }
2273 } else {
2274 return JNI_ENOMEM;
2275 }
2276 }
2277 return JNI_OK;
2278 }
2279
2280 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2281 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2282 // The min and max sizes match the values in globals.hpp, but scaled
2283 // with K. The values have been chosen so that alignment with page
2284 // size doesn't change the max value, which makes the conversions
2285 // back and forth between Xss value and ThreadStackSize value easier.
2286 // The values have also been chosen to fit inside a 32-bit signed type.
2287 const julong min_ThreadStackSize = 0;
2288 const julong max_ThreadStackSize = 1 * M;
2289
2290 const julong min_size = min_ThreadStackSize * K;
2291 const julong max_size = max_ThreadStackSize * K;
2292
2293 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2294
2295 julong size = 0;
2296 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2297 if (errcode != arg_in_range) {
2298 bool silent = (option == NULL); // Allow testing to silence error messages
2299 if (!silent) {
2300 jio_fprintf(defaultStream::error_stream(),
2301 "Invalid thread stack size: %s\n", option->optionString);
2302 describe_range_error(errcode);
2303 }
2304 return JNI_EINVAL;
2305 }
2306
2307 // Internally track ThreadStackSize in units of 1024 bytes.
2308 const julong size_aligned = align_up(size, K);
2309 assert(size <= size_aligned,
2310 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2311 size, size_aligned);
2312
2313 const julong size_in_K = size_aligned / K;
2314 assert(size_in_K < (julong)max_intx,
2315 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2316 size_in_K);
2317
2318 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2319 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2320 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2321 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2322 max_expanded, size_in_K);
2323
2324 *out_ThreadStackSize = (intx)size_in_K;
2325
2326 return JNI_OK;
2327 }
2328
2329 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2330 // For match_option to return remaining or value part of option string
2331 const char* tail;
2332
2333 // iterate over arguments
2334 for (int index = 0; index < args->nOptions; index++) {
2335 bool is_absolute_path = false; // for -agentpath vs -agentlib
2336
2337 const JavaVMOption* option = args->options + index;
2338
2339 if (!match_option(option, "-Djava.class.path", &tail) &&
2340 !match_option(option, "-Dsun.java.command", &tail) &&
2341 !match_option(option, "-Dsun.java.launcher", &tail)) {
2342
2343 // add all jvm options to the jvm_args string. This string
2344 // is used later to set the java.vm.args PerfData string constant.
2345 // the -Djava.class.path and the -Dsun.java.command options are
2346 // omitted from jvm_args string as each have their own PerfData
2347 // string constant object.
2348 build_jvm_args(option->optionString);
2349 }
2350
2351 // -verbose:[class/module/gc/jni]
2352 if (match_option(option, "-verbose", &tail)) {
2353 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2354 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2355 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2356 } else if (!strcmp(tail, ":module")) {
2357 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2358 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2359 } else if (!strcmp(tail, ":gc")) {
2360 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2361 } else if (!strcmp(tail, ":jni")) {
2362 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2363 return JNI_EINVAL;
2364 }
2365 }
2366 // -da / -ea / -disableassertions / -enableassertions
2367 // These accept an optional class/package name separated by a colon, e.g.,
2368 // -da:java.lang.Thread.
2369 } else if (match_option(option, user_assertion_options, &tail, true)) {
2370 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2371 if (*tail == '\0') {
2372 JavaAssertions::setUserClassDefault(enable);
2373 } else {
2374 assert(*tail == ':', "bogus match by match_option()");
2375 JavaAssertions::addOption(tail + 1, enable);
2376 }
2377 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2378 } else if (match_option(option, system_assertion_options, &tail, false)) {
2379 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2380 JavaAssertions::setSystemClassDefault(enable);
2381 // -bootclasspath:
2382 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2383 jio_fprintf(defaultStream::output_stream(),
2384 "-Xbootclasspath is no longer a supported option.\n");
2385 return JNI_EINVAL;
2386 // -bootclasspath/a:
2387 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2388 Arguments::append_sysclasspath(tail);
2389 // -bootclasspath/p:
2390 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2391 jio_fprintf(defaultStream::output_stream(),
2392 "-Xbootclasspath/p is no longer a supported option.\n");
2393 return JNI_EINVAL;
2394 // -Xrun
2395 } else if (match_option(option, "-Xrun", &tail)) {
2396 if (tail != NULL) {
2397 const char* pos = strchr(tail, ':');
2398 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2399 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2400 jio_snprintf(name, len + 1, "%s", tail);
2401
2402 char *options = NULL;
2403 if(pos != NULL) {
2404 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2405 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2406 }
2407 #if !INCLUDE_JVMTI
2408 if (strcmp(name, "jdwp") == 0) {
2409 jio_fprintf(defaultStream::error_stream(),
2410 "Debugging agents are not supported in this VM\n");
2411 return JNI_ERR;
2412 }
2413 #endif // !INCLUDE_JVMTI
2414 add_init_library(name, options);
2415 }
2416 } else if (match_option(option, "--add-reads=", &tail)) {
2417 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2418 return JNI_ENOMEM;
2419 }
2420 } else if (match_option(option, "--add-exports=", &tail)) {
2421 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2422 return JNI_ENOMEM;
2423 }
2424 } else if (match_option(option, "--add-opens=", &tail)) {
2425 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2426 return JNI_ENOMEM;
2427 }
2428 } else if (match_option(option, "--add-modules=", &tail)) {
2429 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2430 return JNI_ENOMEM;
2431 }
2432 } else if (match_option(option, "--limit-modules=", &tail)) {
2433 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2434 return JNI_ENOMEM;
2435 }
2436 } else if (match_option(option, "--module-path=", &tail)) {
2437 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2438 return JNI_ENOMEM;
2439 }
2440 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2441 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2442 return JNI_ENOMEM;
2443 }
2444 } else if (match_option(option, "--patch-module=", &tail)) {
2445 // --patch-module=<module>=<file>(<pathsep><file>)*
2446 int res = process_patch_mod_option(tail, patch_mod_javabase);
2447 if (res != JNI_OK) {
2448 return res;
2449 }
2450 } else if (match_option(option, "--illegal-access=", &tail)) {
2451 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2452 return JNI_ENOMEM;
2453 }
2454 // -agentlib and -agentpath
2455 } else if (match_option(option, "-agentlib:", &tail) ||
2456 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2457 if(tail != NULL) {
2458 const char* pos = strchr(tail, '=');
2459 char* name;
2460 if (pos == NULL) {
2461 name = os::strdup_check_oom(tail, mtArguments);
2462 } else {
2463 size_t len = pos - tail;
2464 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2465 memcpy(name, tail, len);
2466 name[len] = '\0';
2467 }
2468
2469 char *options = NULL;
2470 if(pos != NULL) {
2471 options = os::strdup_check_oom(pos + 1, mtArguments);
2472 }
2473 #if !INCLUDE_JVMTI
2474 if (valid_jdwp_agent(name, is_absolute_path)) {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Debugging agents are not supported in this VM\n");
2477 return JNI_ERR;
2478 }
2479 #endif // !INCLUDE_JVMTI
2480 add_init_agent(name, options, is_absolute_path);
2481 }
2482 // -javaagent
2483 } else if (match_option(option, "-javaagent:", &tail)) {
2484 #if !INCLUDE_JVMTI
2485 jio_fprintf(defaultStream::error_stream(),
2486 "Instrumentation agents are not supported in this VM\n");
2487 return JNI_ERR;
2488 #else
2489 if (tail != NULL) {
2490 size_t length = strlen(tail) + 1;
2491 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2492 jio_snprintf(options, length, "%s", tail);
2493 add_instrument_agent("instrument", options, false);
2494 // java agents need module java.instrument
2495 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2496 return JNI_ENOMEM;
2497 }
2498 }
2499 #endif // !INCLUDE_JVMTI
2500 // --enable_preview
2501 } else if (match_option(option, "--enable-preview")) {
2502 set_enable_preview();
2503 // -Xnoclassgc
2504 } else if (match_option(option, "-Xnoclassgc")) {
2505 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2506 return JNI_EINVAL;
2507 }
2508 // -Xconcgc
2509 } else if (match_option(option, "-Xconcgc")) {
2510 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2511 return JNI_EINVAL;
2512 }
2513 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2514 // -Xnoconcgc
2515 } else if (match_option(option, "-Xnoconcgc")) {
2516 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2517 return JNI_EINVAL;
2518 }
2519 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2520 // -Xbatch
2521 } else if (match_option(option, "-Xbatch")) {
2522 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2523 return JNI_EINVAL;
2524 }
2525 // -Xmn for compatibility with other JVM vendors
2526 } else if (match_option(option, "-Xmn", &tail)) {
2527 julong long_initial_young_size = 0;
2528 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2529 if (errcode != arg_in_range) {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "Invalid initial young generation size: %s\n", option->optionString);
2532 describe_range_error(errcode);
2533 return JNI_EINVAL;
2534 }
2535 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2536 return JNI_EINVAL;
2537 }
2538 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2539 return JNI_EINVAL;
2540 }
2541 // -Xms
2542 } else if (match_option(option, "-Xms", &tail)) {
2543 julong long_initial_heap_size = 0;
2544 // an initial heap size of 0 means automatically determine
2545 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2546 if (errcode != arg_in_range) {
2547 jio_fprintf(defaultStream::error_stream(),
2548 "Invalid initial heap size: %s\n", option->optionString);
2549 describe_range_error(errcode);
2550 return JNI_EINVAL;
2551 }
2552 set_min_heap_size((size_t)long_initial_heap_size);
2553 // Currently the minimum size and the initial heap sizes are the same.
2554 // Can be overridden with -XX:InitialHeapSize.
2555 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2556 return JNI_EINVAL;
2557 }
2558 // -Xmx
2559 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2560 julong long_max_heap_size = 0;
2561 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2562 if (errcode != arg_in_range) {
2563 jio_fprintf(defaultStream::error_stream(),
2564 "Invalid maximum heap size: %s\n", option->optionString);
2565 describe_range_error(errcode);
2566 return JNI_EINVAL;
2567 }
2568 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2569 return JNI_EINVAL;
2570 }
2571 // Xmaxf
2572 } else if (match_option(option, "-Xmaxf", &tail)) {
2573 char* err;
2574 int maxf = (int)(strtod(tail, &err) * 100);
2575 if (*err != '\0' || *tail == '\0') {
2576 jio_fprintf(defaultStream::error_stream(),
2577 "Bad max heap free percentage size: %s\n",
2578 option->optionString);
2579 return JNI_EINVAL;
2580 } else {
2581 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2582 return JNI_EINVAL;
2583 }
2584 }
2585 // Xminf
2586 } else if (match_option(option, "-Xminf", &tail)) {
2587 char* err;
2588 int minf = (int)(strtod(tail, &err) * 100);
2589 if (*err != '\0' || *tail == '\0') {
2590 jio_fprintf(defaultStream::error_stream(),
2591 "Bad min heap free percentage size: %s\n",
2592 option->optionString);
2593 return JNI_EINVAL;
2594 } else {
2595 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 }
2599 // -Xss
2600 } else if (match_option(option, "-Xss", &tail)) {
2601 intx value = 0;
2602 jint err = parse_xss(option, tail, &value);
2603 if (err != JNI_OK) {
2604 return err;
2605 }
2606 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2607 return JNI_EINVAL;
2608 }
2609 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2610 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2611 julong long_ReservedCodeCacheSize = 0;
2612
2613 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2614 if (errcode != arg_in_range) {
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Invalid maximum code cache size: %s.\n", option->optionString);
2617 return JNI_EINVAL;
2618 }
2619 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2620 return JNI_EINVAL;
2621 }
2622 // -green
2623 } else if (match_option(option, "-green")) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Green threads support not available\n");
2626 return JNI_EINVAL;
2627 // -native
2628 } else if (match_option(option, "-native")) {
2629 // HotSpot always uses native threads, ignore silently for compatibility
2630 // -Xrs
2631 } else if (match_option(option, "-Xrs")) {
2632 // Classic/EVM option, new functionality
2633 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2634 return JNI_EINVAL;
2635 }
2636 // -Xprof
2637 } else if (match_option(option, "-Xprof")) {
2638 char version[256];
2639 // Obsolete in JDK 10
2640 JDK_Version::jdk(10).to_string(version, sizeof(version));
2641 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2642 // -Xinternalversion
2643 } else if (match_option(option, "-Xinternalversion")) {
2644 jio_fprintf(defaultStream::output_stream(), "%s\n",
2645 VM_Version::internal_vm_info_string());
2646 vm_exit(0);
2647 #ifndef PRODUCT
2648 // -Xprintflags
2649 } else if (match_option(option, "-Xprintflags")) {
2650 JVMFlag::printFlags(tty, false);
2651 vm_exit(0);
2652 #endif
2653 // -D
2654 } else if (match_option(option, "-D", &tail)) {
2655 const char* value;
2656 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2657 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2658 // abort if -Djava.endorsed.dirs is set
2659 jio_fprintf(defaultStream::output_stream(),
2660 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2661 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2662 return JNI_EINVAL;
2663 }
2664 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2665 *value != '\0' && strcmp(value, "\"\"") != 0) {
2666 // abort if -Djava.ext.dirs is set
2667 jio_fprintf(defaultStream::output_stream(),
2668 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2669 return JNI_EINVAL;
2670 }
2671 // Check for module related properties. They must be set using the modules
2672 // options. For example: use "--add-modules=java.sql", not
2673 // "-Djdk.module.addmods=java.sql"
2674 if (is_internal_module_property(option->optionString + 2)) {
2675 needs_module_property_warning = true;
2676 continue;
2677 }
2678
2679 if (!add_property(tail)) {
2680 return JNI_ENOMEM;
2681 }
2682 // Out of the box management support
2683 if (match_option(option, "-Dcom.sun.management", &tail)) {
2684 #if INCLUDE_MANAGEMENT
2685 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 // management agent in module jdk.management.agent
2689 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2690 return JNI_ENOMEM;
2691 }
2692 #else
2693 jio_fprintf(defaultStream::output_stream(),
2694 "-Dcom.sun.management is not supported in this VM.\n");
2695 return JNI_ERR;
2696 #endif
2697 }
2698 // -Xint
2699 } else if (match_option(option, "-Xint")) {
2700 set_mode_flags(_int);
2701 // -Xmixed
2702 } else if (match_option(option, "-Xmixed")) {
2703 set_mode_flags(_mixed);
2704 // -Xcomp
2705 } else if (match_option(option, "-Xcomp")) {
2706 // for testing the compiler; turn off all flags that inhibit compilation
2707 set_mode_flags(_comp);
2708 // -Xshare:dump
2709 } else if (match_option(option, "-Xshare:dump")) {
2710 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 set_mode_flags(_int); // Prevent compilation, which creates objects
2714 // -Xshare:on
2715 } else if (match_option(option, "-Xshare:on")) {
2716 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 // -Xshare:auto
2723 } else if (match_option(option, "-Xshare:auto")) {
2724 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 // -Xshare:off
2731 } else if (match_option(option, "-Xshare:off")) {
2732 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2736 return JNI_EINVAL;
2737 }
2738 // -Xverify
2739 } else if (match_option(option, "-Xverify", &tail)) {
2740 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2741 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 } else if (strcmp(tail, ":remote") == 0) {
2748 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 } else if (strcmp(tail, ":none") == 0) {
2755 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2762 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2763 return JNI_EINVAL;
2764 }
2765 // -Xdebug
2766 } else if (match_option(option, "-Xdebug")) {
2767 // note this flag has been used, then ignore
2768 set_xdebug_mode(true);
2769 // -Xnoagent
2770 } else if (match_option(option, "-Xnoagent")) {
2771 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2772 } else if (match_option(option, "-Xloggc:", &tail)) {
2773 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2774 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2775 _gc_log_filename = os::strdup_check_oom(tail);
2776 } else if (match_option(option, "-Xlog", &tail)) {
2777 bool ret = false;
2778 if (strcmp(tail, ":help") == 0) {
2779 fileStream stream(defaultStream::output_stream());
2780 LogConfiguration::print_command_line_help(&stream);
2781 vm_exit(0);
2782 } else if (strcmp(tail, ":disable") == 0) {
2783 LogConfiguration::disable_logging();
2784 ret = true;
2785 } else if (*tail == '\0') {
2786 ret = LogConfiguration::parse_command_line_arguments();
2787 assert(ret, "-Xlog without arguments should never fail to parse");
2788 } else if (*tail == ':') {
2789 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2790 }
2791 if (ret == false) {
2792 jio_fprintf(defaultStream::error_stream(),
2793 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2794 tail);
2795 return JNI_EINVAL;
2796 }
2797 // JNI hooks
2798 } else if (match_option(option, "-Xcheck", &tail)) {
2799 if (!strcmp(tail, ":jni")) {
2800 #if !INCLUDE_JNI_CHECK
2801 warning("JNI CHECKING is not supported in this VM");
2802 #else
2803 CheckJNICalls = true;
2804 #endif // INCLUDE_JNI_CHECK
2805 } else if (is_bad_option(option, args->ignoreUnrecognized,
2806 "check")) {
2807 return JNI_EINVAL;
2808 }
2809 } else if (match_option(option, "vfprintf")) {
2810 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2811 } else if (match_option(option, "exit")) {
2812 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2813 } else if (match_option(option, "abort")) {
2814 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2815 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2816 // and the last option wins.
2817 } else if (match_option(option, "-XX:+NeverTenure")) {
2818 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
2819 return JNI_EINVAL;
2820 }
2821 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2822 return JNI_EINVAL;
2823 }
2824 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2825 return JNI_EINVAL;
2826 }
2827 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2828 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2838 uintx max_tenuring_thresh = 0;
2839 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2842 return JNI_EINVAL;
2843 }
2844
2845 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2846 return JNI_EINVAL;
2847 }
2848
2849 if (MaxTenuringThreshold == 0) {
2850 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2851 return JNI_EINVAL;
2852 }
2853 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 } else {
2857 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2858 return JNI_EINVAL;
2859 }
2860 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 }
2864 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2865 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2866 return JNI_EINVAL;
2867 }
2868 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2869 return JNI_EINVAL;
2870 }
2871 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2872 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2879 if (FLAG_SET_CMDLINE(bool, ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 if (FLAG_SET_CMDLINE(bool, ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2886 if (FLAG_SET_CMDLINE(bool, ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2887 return JNI_EINVAL;
2888 }
2889 if (FLAG_SET_CMDLINE(bool, ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2893 #if defined(DTRACE_ENABLED)
2894 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2895 return JNI_EINVAL;
2896 }
2897 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2898 return JNI_EINVAL;
2899 }
2900 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 #else // defined(DTRACE_ENABLED)
2907 jio_fprintf(defaultStream::error_stream(),
2908 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2909 return JNI_EINVAL;
2910 #endif // defined(DTRACE_ENABLED)
2911 #ifdef ASSERT
2912 } else if (match_option(option, "-XX:+FullGCALot")) {
2913 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 // disable scavenge before parallel mark-compact
2917 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 #endif
2921 #if !INCLUDE_MANAGEMENT
2922 } else if (match_option(option, "-XX:+ManagementServer")) {
2923 jio_fprintf(defaultStream::error_stream(),
2924 "ManagementServer is not supported in this VM.\n");
2925 return JNI_ERR;
2926 #endif // INCLUDE_MANAGEMENT
2927 #if INCLUDE_JFR
2928 } else if (match_jfr_option(&option)) {
2929 return JNI_EINVAL;
2930 #endif
2931 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2932 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2933 // already been handled
2934 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2935 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2936 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2937 return JNI_EINVAL;
2938 }
2939 }
2940 // Unknown option
2941 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2942 return JNI_ERR;
2943 }
2944 }
2945
2946 // PrintSharedArchiveAndExit will turn on
2947 // -Xshare:on
2948 // -Xlog:class+path=info
2949 if (PrintSharedArchiveAndExit) {
2950 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2957 }
2958
2959 // Change the default value for flags which have different default values
2960 // when working with older JDKs.
2961 #ifdef LINUX
2962 if (JDK_Version::current().compare_major(6) <= 0 &&
2963 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2964 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2965 }
2966 #endif // LINUX
2967 fix_appclasspath();
2968
2969 return JNI_OK;
2970 }
2971
2972 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2973 // For java.base check for duplicate --patch-module options being specified on the command line.
2974 // This check is only required for java.base, all other duplicate module specifications
2975 // will be checked during module system initialization. The module system initialization
2976 // will throw an ExceptionInInitializerError if this situation occurs.
2977 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2978 if (*patch_mod_javabase) {
2979 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2980 } else {
2981 *patch_mod_javabase = true;
2982 }
2983 }
2984
2985 // Create GrowableArray lazily, only if --patch-module has been specified
2986 if (_patch_mod_prefix == NULL) {
2987 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
2988 }
2989
2990 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2991 }
2992
2993 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2994 //
2995 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2996 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2997 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2998 // path is treated as the current directory.
2999 //
3000 // This causes problems with CDS, which requires that all directories specified in the classpath
3001 // must be empty. In most cases, applications do NOT want to load classes from the current
3002 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3003 // scripts compatible with CDS.
3004 void Arguments::fix_appclasspath() {
3005 if (IgnoreEmptyClassPaths) {
3006 const char separator = *os::path_separator();
3007 const char* src = _java_class_path->value();
3008
3009 // skip over all the leading empty paths
3010 while (*src == separator) {
3011 src ++;
3012 }
3013
3014 char* copy = os::strdup_check_oom(src, mtArguments);
3015
3016 // trim all trailing empty paths
3017 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3018 *tail = '\0';
3019 }
3020
3021 char from[3] = {separator, separator, '\0'};
3022 char to [2] = {separator, '\0'};
3023 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3024 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3025 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3026 }
3027
3028 _java_class_path->set_writeable_value(copy);
3029 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3030 }
3031 }
3032
3033 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3034 // check if the default lib/endorsed directory exists; if so, error
3035 char path[JVM_MAXPATHLEN];
3036 const char* fileSep = os::file_separator();
3037 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3038
3039 DIR* dir = os::opendir(path);
3040 if (dir != NULL) {
3041 jio_fprintf(defaultStream::output_stream(),
3042 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3043 "in modular form will be supported via the concept of upgradeable modules.\n");
3044 os::closedir(dir);
3045 return JNI_ERR;
3046 }
3047
3048 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3049 dir = os::opendir(path);
3050 if (dir != NULL) {
3051 jio_fprintf(defaultStream::output_stream(),
3052 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3053 "Use -classpath instead.\n.");
3054 os::closedir(dir);
3055 return JNI_ERR;
3056 }
3057
3058 // This must be done after all arguments have been processed
3059 // and the container support has been initialized since AggressiveHeap
3060 // relies on the amount of total memory available.
3061 if (AggressiveHeap) {
3062 jint result = set_aggressive_heap_flags();
3063 if (result != JNI_OK) {
3064 return result;
3065 }
3066 }
3067
3068 // This must be done after all arguments have been processed.
3069 // java_compiler() true means set to "NONE" or empty.
3070 if (java_compiler() && !xdebug_mode()) {
3071 // For backwards compatibility, we switch to interpreted mode if
3072 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3073 // not specified.
3074 set_mode_flags(_int);
3075 }
3076
3077 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3078 // but like -Xint, leave compilation thresholds unaffected.
3079 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3080 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3081 set_mode_flags(_int);
3082 }
3083
3084 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3085 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3086 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3087 }
3088
3089 #if !COMPILER2_OR_JVMCI
3090 // Don't degrade server performance for footprint
3091 if (FLAG_IS_DEFAULT(UseLargePages) &&
3092 MaxHeapSize < LargePageHeapSizeThreshold) {
3093 // No need for large granularity pages w/small heaps.
3094 // Note that large pages are enabled/disabled for both the
3095 // Java heap and the code cache.
3096 FLAG_SET_DEFAULT(UseLargePages, false);
3097 }
3098
3099 UNSUPPORTED_OPTION(ProfileInterpreter);
3100 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3101 #endif
3102
3103 #ifndef TIERED
3104 // Tiered compilation is undefined.
3105 UNSUPPORTED_OPTION(TieredCompilation);
3106 #endif
3107
3108 if (!check_vm_args_consistency()) {
3109 return JNI_ERR;
3110 }
3111
3112 #if INCLUDE_CDS
3113 if (DumpSharedSpaces) {
3114 // Disable biased locking now as it interferes with the clean up of
3115 // the archived Klasses and Java string objects (at dump time only).
3116 UseBiasedLocking = false;
3117
3118 // Always verify non-system classes during CDS dump
3119 if (!BytecodeVerificationRemote) {
3120 BytecodeVerificationRemote = true;
3121 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3122 }
3123
3124 // Compilation is already disabled if the user specifies -Xshare:dump.
3125 // Disable compilation in case user specifies -XX:+DumpSharedSpaces instead of -Xshare:dump.
3126 set_mode_flags(_int);
3127 }
3128 if (UseSharedSpaces && patch_mod_javabase) {
3129 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3130 }
3131 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3132 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3133 }
3134 #endif
3135
3136 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3137 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3138 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3139
3140 return JNI_OK;
3141 }
3142
3143 // Helper class for controlling the lifetime of JavaVMInitArgs
3144 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3145 // deleted on the destruction of the ScopedVMInitArgs object.
3146 class ScopedVMInitArgs : public StackObj {
3147 private:
3148 JavaVMInitArgs _args;
3149 char* _container_name;
3150 bool _is_set;
3151 char* _vm_options_file_arg;
3152
3153 public:
3154 ScopedVMInitArgs(const char *container_name) {
3155 _args.version = JNI_VERSION_1_2;
3156 _args.nOptions = 0;
3157 _args.options = NULL;
3158 _args.ignoreUnrecognized = false;
3159 _container_name = (char *)container_name;
3160 _is_set = false;
3161 _vm_options_file_arg = NULL;
3162 }
3163
3164 // Populates the JavaVMInitArgs object represented by this
3165 // ScopedVMInitArgs object with the arguments in options. The
3166 // allocated memory is deleted by the destructor. If this method
3167 // returns anything other than JNI_OK, then this object is in a
3168 // partially constructed state, and should be abandoned.
3169 jint set_args(GrowableArray<JavaVMOption>* options) {
3170 _is_set = true;
3171 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3172 JavaVMOption, options->length(), mtArguments);
3173 if (options_arr == NULL) {
3174 return JNI_ENOMEM;
3175 }
3176 _args.options = options_arr;
3177
3178 for (int i = 0; i < options->length(); i++) {
3179 options_arr[i] = options->at(i);
3180 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3181 if (options_arr[i].optionString == NULL) {
3182 // Rely on the destructor to do cleanup.
3183 _args.nOptions = i;
3184 return JNI_ENOMEM;
3185 }
3186 }
3187
3188 _args.nOptions = options->length();
3189 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3190 return JNI_OK;
3191 }
3192
3193 JavaVMInitArgs* get() { return &_args; }
3194 char* container_name() { return _container_name; }
3195 bool is_set() { return _is_set; }
3196 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3197 char* vm_options_file_arg() { return _vm_options_file_arg; }
3198
3199 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3200 if (_vm_options_file_arg != NULL) {
3201 os::free(_vm_options_file_arg);
3202 }
3203 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3204 }
3205
3206 ~ScopedVMInitArgs() {
3207 if (_vm_options_file_arg != NULL) {
3208 os::free(_vm_options_file_arg);
3209 }
3210 if (_args.options == NULL) return;
3211 for (int i = 0; i < _args.nOptions; i++) {
3212 os::free(_args.options[i].optionString);
3213 }
3214 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3215 }
3216
3217 // Insert options into this option list, to replace option at
3218 // vm_options_file_pos (-XX:VMOptionsFile)
3219 jint insert(const JavaVMInitArgs* args,
3220 const JavaVMInitArgs* args_to_insert,
3221 const int vm_options_file_pos) {
3222 assert(_args.options == NULL, "shouldn't be set yet");
3223 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3224 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3225
3226 int length = args->nOptions + args_to_insert->nOptions - 1;
3227 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3228 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3229 for (int i = 0; i < args->nOptions; i++) {
3230 if (i == vm_options_file_pos) {
3231 // insert the new options starting at the same place as the
3232 // -XX:VMOptionsFile option
3233 for (int j = 0; j < args_to_insert->nOptions; j++) {
3234 options->push(args_to_insert->options[j]);
3235 }
3236 } else {
3237 options->push(args->options[i]);
3238 }
3239 }
3240 // make into options array
3241 jint result = set_args(options);
3242 delete options;
3243 return result;
3244 }
3245 };
3246
3247 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3248 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3249 }
3250
3251 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3252 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3253 }
3254
3255 jint Arguments::parse_options_environment_variable(const char* name,
3256 ScopedVMInitArgs* vm_args) {
3257 char *buffer = ::getenv(name);
3258
3259 // Don't check this environment variable if user has special privileges
3260 // (e.g. unix su command).
3261 if (buffer == NULL || os::have_special_privileges()) {
3262 return JNI_OK;
3263 }
3264
3265 if ((buffer = os::strdup(buffer)) == NULL) {
3266 return JNI_ENOMEM;
3267 }
3268
3269 jio_fprintf(defaultStream::error_stream(),
3270 "Picked up %s: %s\n", name, buffer);
3271
3272 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3273
3274 os::free(buffer);
3275 return retcode;
3276 }
3277
3278 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3279 // read file into buffer
3280 int fd = ::open(file_name, O_RDONLY);
3281 if (fd < 0) {
3282 jio_fprintf(defaultStream::error_stream(),
3283 "Could not open options file '%s'\n",
3284 file_name);
3285 return JNI_ERR;
3286 }
3287
3288 struct stat stbuf;
3289 int retcode = os::stat(file_name, &stbuf);
3290 if (retcode != 0) {
3291 jio_fprintf(defaultStream::error_stream(),
3292 "Could not stat options file '%s'\n",
3293 file_name);
3294 os::close(fd);
3295 return JNI_ERR;
3296 }
3297
3298 if (stbuf.st_size == 0) {
3299 // tell caller there is no option data and that is ok
3300 os::close(fd);
3301 return JNI_OK;
3302 }
3303
3304 // '+ 1' for NULL termination even with max bytes
3305 size_t bytes_alloc = stbuf.st_size + 1;
3306
3307 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3308 if (NULL == buf) {
3309 jio_fprintf(defaultStream::error_stream(),
3310 "Could not allocate read buffer for options file parse\n");
3311 os::close(fd);
3312 return JNI_ENOMEM;
3313 }
3314
3315 memset(buf, 0, bytes_alloc);
3316
3317 // Fill buffer
3318 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3319 os::close(fd);
3320 if (bytes_read < 0) {
3321 FREE_C_HEAP_ARRAY(char, buf);
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Could not read options file '%s'\n", file_name);
3324 return JNI_ERR;
3325 }
3326
3327 if (bytes_read == 0) {
3328 // tell caller there is no option data and that is ok
3329 FREE_C_HEAP_ARRAY(char, buf);
3330 return JNI_OK;
3331 }
3332
3333 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3334
3335 FREE_C_HEAP_ARRAY(char, buf);
3336 return retcode;
3337 }
3338
3339 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3340 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3341
3342 // some pointers to help with parsing
3343 char *buffer_end = buffer + buf_len;
3344 char *opt_hd = buffer;
3345 char *wrt = buffer;
3346 char *rd = buffer;
3347
3348 // parse all options
3349 while (rd < buffer_end) {
3350 // skip leading white space from the input string
3351 while (rd < buffer_end && isspace(*rd)) {
3352 rd++;
3353 }
3354
3355 if (rd >= buffer_end) {
3356 break;
3357 }
3358
3359 // Remember this is where we found the head of the token.
3360 opt_hd = wrt;
3361
3362 // Tokens are strings of non white space characters separated
3363 // by one or more white spaces.
3364 while (rd < buffer_end && !isspace(*rd)) {
3365 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3366 int quote = *rd; // matching quote to look for
3367 rd++; // don't copy open quote
3368 while (rd < buffer_end && *rd != quote) {
3369 // include everything (even spaces)
3370 // up until the close quote
3371 *wrt++ = *rd++; // copy to option string
3372 }
3373
3374 if (rd < buffer_end) {
3375 rd++; // don't copy close quote
3376 } else {
3377 // did not see closing quote
3378 jio_fprintf(defaultStream::error_stream(),
3379 "Unmatched quote in %s\n", name);
3380 delete options;
3381 return JNI_ERR;
3382 }
3383 } else {
3384 *wrt++ = *rd++; // copy to option string
3385 }
3386 }
3387
3388 // steal a white space character and set it to NULL
3389 *wrt++ = '\0';
3390 // We now have a complete token
3391
3392 JavaVMOption option;
3393 option.optionString = opt_hd;
3394 option.extraInfo = NULL;
3395
3396 options->append(option); // Fill in option
3397
3398 rd++; // Advance to next character
3399 }
3400
3401 // Fill out JavaVMInitArgs structure.
3402 jint status = vm_args->set_args(options);
3403
3404 delete options;
3405 return status;
3406 }
3407
3408 void Arguments::set_shared_spaces_flags() {
3409 if (DumpSharedSpaces) {
3410 if (FailOverToOldVerifier) {
3411 // Don't fall back to the old verifier on verification failure. If a
3412 // class fails verification with the split verifier, it might fail the
3413 // CDS runtime verifier constraint check. In that case, we don't want
3414 // to share the class. We only archive classes that pass the split verifier.
3415 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3416 }
3417
3418 if (RequireSharedSpaces) {
3419 warning("Cannot dump shared archive while using shared archive");
3420 }
3421 UseSharedSpaces = false;
3422 #ifdef _LP64
3423 if (!UseCompressedOops || !UseCompressedClassPointers) {
3424 vm_exit_during_initialization(
3425 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3426 }
3427 } else {
3428 if (!UseCompressedOops || !UseCompressedClassPointers) {
3429 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3430 }
3431 #endif
3432 }
3433 }
3434
3435 // Sharing support
3436 // Construct the path to the archive
3437 char* Arguments::get_default_shared_archive_path() {
3438 char *default_archive_path;
3439 char jvm_path[JVM_MAXPATHLEN];
3440 os::jvm_path(jvm_path, sizeof(jvm_path));
3441 char *end = strrchr(jvm_path, *os::file_separator());
3442 if (end != NULL) *end = '\0';
3443 size_t jvm_path_len = strlen(jvm_path);
3444 size_t file_sep_len = strlen(os::file_separator());
3445 const size_t len = jvm_path_len + file_sep_len + 20;
3446 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3447 if (default_archive_path != NULL) {
3448 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3449 jvm_path, os::file_separator());
3450 }
3451 return default_archive_path;
3452 }
3453
3454 static char* get_shared_archive_path() {
3455 char *shared_archive_path;
3456 if (SharedArchiveFile == NULL) {
3457 shared_archive_path = Arguments::get_default_shared_archive_path();
3458 } else {
3459 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3460 }
3461 return shared_archive_path;
3462 }
3463
3464 #ifndef PRODUCT
3465 // Determine whether LogVMOutput should be implicitly turned on.
3466 static bool use_vm_log() {
3467 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3468 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3469 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3470 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3471 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3472 return true;
3473 }
3474
3475 #ifdef COMPILER1
3476 if (PrintC1Statistics) {
3477 return true;
3478 }
3479 #endif // COMPILER1
3480
3481 #ifdef COMPILER2
3482 if (PrintOptoAssembly || PrintOptoStatistics) {
3483 return true;
3484 }
3485 #endif // COMPILER2
3486
3487 return false;
3488 }
3489
3490 #endif // PRODUCT
3491
3492 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3493 for (int index = 0; index < args->nOptions; index++) {
3494 const JavaVMOption* option = args->options + index;
3495 const char* tail;
3496 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3497 return true;
3498 }
3499 }
3500 return false;
3501 }
3502
3503 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3504 const char* vm_options_file,
3505 const int vm_options_file_pos,
3506 ScopedVMInitArgs* vm_options_file_args,
3507 ScopedVMInitArgs* args_out) {
3508 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3509 if (code != JNI_OK) {
3510 return code;
3511 }
3512
3513 if (vm_options_file_args->get()->nOptions < 1) {
3514 return JNI_OK;
3515 }
3516
3517 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3518 jio_fprintf(defaultStream::error_stream(),
3519 "A VM options file may not refer to a VM options file. "
3520 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3521 "options file '%s' in options container '%s' is an error.\n",
3522 vm_options_file_args->vm_options_file_arg(),
3523 vm_options_file_args->container_name());
3524 return JNI_EINVAL;
3525 }
3526
3527 return args_out->insert(args, vm_options_file_args->get(),
3528 vm_options_file_pos);
3529 }
3530
3531 // Expand -XX:VMOptionsFile found in args_in as needed.
3532 // mod_args and args_out parameters may return values as needed.
3533 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3534 ScopedVMInitArgs* mod_args,
3535 JavaVMInitArgs** args_out) {
3536 jint code = match_special_option_and_act(args_in, mod_args);
3537 if (code != JNI_OK) {
3538 return code;
3539 }
3540
3541 if (mod_args->is_set()) {
3542 // args_in contains -XX:VMOptionsFile and mod_args contains the
3543 // original options from args_in along with the options expanded
3544 // from the VMOptionsFile. Return a short-hand to the caller.
3545 *args_out = mod_args->get();
3546 } else {
3547 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3548 }
3549 return JNI_OK;
3550 }
3551
3552 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3553 ScopedVMInitArgs* args_out) {
3554 // Remaining part of option string
3555 const char* tail;
3556 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3557
3558 for (int index = 0; index < args->nOptions; index++) {
3559 const JavaVMOption* option = args->options + index;
3560 if (match_option(option, "-XX:Flags=", &tail)) {
3561 Arguments::set_jvm_flags_file(tail);
3562 continue;
3563 }
3564 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3565 if (vm_options_file_args.found_vm_options_file_arg()) {
3566 jio_fprintf(defaultStream::error_stream(),
3567 "The option '%s' is already specified in the options "
3568 "container '%s' so the specification of '%s' in the "
3569 "same options container is an error.\n",
3570 vm_options_file_args.vm_options_file_arg(),
3571 vm_options_file_args.container_name(),
3572 option->optionString);
3573 return JNI_EINVAL;
3574 }
3575 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3576 // If there's a VMOptionsFile, parse that
3577 jint code = insert_vm_options_file(args, tail, index,
3578 &vm_options_file_args, args_out);
3579 if (code != JNI_OK) {
3580 return code;
3581 }
3582 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3583 if (args_out->is_set()) {
3584 // The VMOptions file inserted some options so switch 'args'
3585 // to the new set of options, and continue processing which
3586 // preserves "last option wins" semantics.
3587 args = args_out->get();
3588 // The first option from the VMOptionsFile replaces the
3589 // current option. So we back track to process the
3590 // replacement option.
3591 index--;
3592 }
3593 continue;
3594 }
3595 if (match_option(option, "-XX:+PrintVMOptions")) {
3596 PrintVMOptions = true;
3597 continue;
3598 }
3599 if (match_option(option, "-XX:-PrintVMOptions")) {
3600 PrintVMOptions = false;
3601 continue;
3602 }
3603 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3604 IgnoreUnrecognizedVMOptions = true;
3605 continue;
3606 }
3607 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3608 IgnoreUnrecognizedVMOptions = false;
3609 continue;
3610 }
3611 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3612 JVMFlag::printFlags(tty, false);
3613 vm_exit(0);
3614 }
3615 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3616 #if INCLUDE_NMT
3617 // The launcher did not setup nmt environment variable properly.
3618 if (!MemTracker::check_launcher_nmt_support(tail)) {
3619 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3620 }
3621
3622 // Verify if nmt option is valid.
3623 if (MemTracker::verify_nmt_option()) {
3624 // Late initialization, still in single-threaded mode.
3625 if (MemTracker::tracking_level() >= NMT_summary) {
3626 MemTracker::init();
3627 }
3628 } else {
3629 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3630 }
3631 continue;
3632 #else
3633 jio_fprintf(defaultStream::error_stream(),
3634 "Native Memory Tracking is not supported in this VM\n");
3635 return JNI_ERR;
3636 #endif
3637 }
3638
3639 #ifndef PRODUCT
3640 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3641 JVMFlag::printFlags(tty, true);
3642 vm_exit(0);
3643 }
3644 #endif
3645 }
3646 return JNI_OK;
3647 }
3648
3649 static void print_options(const JavaVMInitArgs *args) {
3650 const char* tail;
3651 for (int index = 0; index < args->nOptions; index++) {
3652 const JavaVMOption *option = args->options + index;
3653 if (match_option(option, "-XX:", &tail)) {
3654 logOption(tail);
3655 }
3656 }
3657 }
3658
3659 bool Arguments::handle_deprecated_print_gc_flags() {
3660 if (PrintGC) {
3661 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3662 }
3663 if (PrintGCDetails) {
3664 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3665 }
3666
3667 if (_gc_log_filename != NULL) {
3668 // -Xloggc was used to specify a filename
3669 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3670
3671 LogTarget(Error, logging) target;
3672 LogStream errstream(target);
3673 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3674 } else if (PrintGC || PrintGCDetails) {
3675 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3676 }
3677 return true;
3678 }
3679
3680 void Arguments::handle_extra_cms_flags(const char* msg) {
3681 SpecialFlag flag;
3682 const char *flag_name = "UseConcMarkSweepGC";
3683 if (lookup_special_flag(flag_name, flag)) {
3684 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3685 warning("%s", msg);
3686 }
3687 }
3688
3689 // Parse entry point called from JNI_CreateJavaVM
3690
3691 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3692 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3693
3694 // Initialize ranges, constraints and writeables
3695 JVMFlagRangeList::init();
3696 JVMFlagConstraintList::init();
3697 JVMFlagWriteableList::init();
3698
3699 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3700 const char* hotspotrc = ".hotspotrc";
3701 bool settings_file_specified = false;
3702 bool needs_hotspotrc_warning = false;
3703 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3704 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3705
3706 // Pointers to current working set of containers
3707 JavaVMInitArgs* cur_cmd_args;
3708 JavaVMInitArgs* cur_java_options_args;
3709 JavaVMInitArgs* cur_java_tool_options_args;
3710
3711 // Containers for modified/expanded options
3712 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3713 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3714 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3715
3716
3717 jint code =
3718 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3719 if (code != JNI_OK) {
3720 return code;
3721 }
3722
3723 code = parse_java_options_environment_variable(&initial_java_options_args);
3724 if (code != JNI_OK) {
3725 return code;
3726 }
3727
3728 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3729 &mod_java_tool_options_args,
3730 &cur_java_tool_options_args);
3731 if (code != JNI_OK) {
3732 return code;
3733 }
3734
3735 code = expand_vm_options_as_needed(initial_cmd_args,
3736 &mod_cmd_args,
3737 &cur_cmd_args);
3738 if (code != JNI_OK) {
3739 return code;
3740 }
3741
3742 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3743 &mod_java_options_args,
3744 &cur_java_options_args);
3745 if (code != JNI_OK) {
3746 return code;
3747 }
3748
3749 const char* flags_file = Arguments::get_jvm_flags_file();
3750 settings_file_specified = (flags_file != NULL);
3751
3752 if (IgnoreUnrecognizedVMOptions) {
3753 cur_cmd_args->ignoreUnrecognized = true;
3754 cur_java_tool_options_args->ignoreUnrecognized = true;
3755 cur_java_options_args->ignoreUnrecognized = true;
3756 }
3757
3758 // Parse specified settings file
3759 if (settings_file_specified) {
3760 if (!process_settings_file(flags_file, true,
3761 cur_cmd_args->ignoreUnrecognized)) {
3762 return JNI_EINVAL;
3763 }
3764 } else {
3765 #ifdef ASSERT
3766 // Parse default .hotspotrc settings file
3767 if (!process_settings_file(".hotspotrc", false,
3768 cur_cmd_args->ignoreUnrecognized)) {
3769 return JNI_EINVAL;
3770 }
3771 #else
3772 struct stat buf;
3773 if (os::stat(hotspotrc, &buf) == 0) {
3774 needs_hotspotrc_warning = true;
3775 }
3776 #endif
3777 }
3778
3779 if (PrintVMOptions) {
3780 print_options(cur_java_tool_options_args);
3781 print_options(cur_cmd_args);
3782 print_options(cur_java_options_args);
3783 }
3784
3785 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3786 jint result = parse_vm_init_args(cur_java_tool_options_args,
3787 cur_java_options_args,
3788 cur_cmd_args);
3789
3790 if (result != JNI_OK) {
3791 return result;
3792 }
3793
3794 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3795 SharedArchivePath = get_shared_archive_path();
3796 if (SharedArchivePath == NULL) {
3797 return JNI_ENOMEM;
3798 }
3799
3800 // Set up VerifySharedSpaces
3801 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3802 VerifySharedSpaces = true;
3803 }
3804
3805 // Delay warning until here so that we've had a chance to process
3806 // the -XX:-PrintWarnings flag
3807 if (needs_hotspotrc_warning) {
3808 warning("%s file is present but has been ignored. "
3809 "Run with -XX:Flags=%s to load the file.",
3810 hotspotrc, hotspotrc);
3811 }
3812
3813 if (needs_module_property_warning) {
3814 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3815 " names that are reserved for internal use.");
3816 }
3817
3818 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3819 UNSUPPORTED_OPTION(UseLargePages);
3820 #endif
3821
3822 #if defined(AIX)
3823 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3824 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3825 #endif
3826
3827 #ifndef PRODUCT
3828 if (TraceBytecodesAt != 0) {
3829 TraceBytecodes = true;
3830 }
3831 if (CountCompiledCalls) {
3832 if (UseCounterDecay) {
3833 warning("UseCounterDecay disabled because CountCalls is set");
3834 UseCounterDecay = false;
3835 }
3836 }
3837 #endif // PRODUCT
3838
3839 if (ScavengeRootsInCode == 0) {
3840 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3841 warning("Forcing ScavengeRootsInCode non-zero");
3842 }
3843 ScavengeRootsInCode = 1;
3844 }
3845
3846 if (!handle_deprecated_print_gc_flags()) {
3847 return JNI_EINVAL;
3848 }
3849
3850 // Set object alignment values.
3851 set_object_alignment();
3852
3853 #if !INCLUDE_CDS
3854 if (DumpSharedSpaces || RequireSharedSpaces) {
3855 jio_fprintf(defaultStream::error_stream(),
3856 "Shared spaces are not supported in this VM\n");
3857 return JNI_ERR;
3858 }
3859 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3860 log_is_enabled(Info, cds)) {
3861 warning("Shared spaces are not supported in this VM");
3862 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3863 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3864 }
3865 no_shared_spaces("CDS Disabled");
3866 #endif // INCLUDE_CDS
3867
3868 return JNI_OK;
3869 }
3870
3871 jint Arguments::apply_ergo() {
3872 // Set flags based on ergonomics.
3873 jint result = set_ergonomics_flags();
3874 if (result != JNI_OK) return result;
3875
3876 // Set heap size based on available physical memory
3877 set_heap_size();
3878
3879 GCConfig::arguments()->initialize();
3880
3881 set_shared_spaces_flags();
3882
3883 // Initialize Metaspace flags and alignments
3884 Metaspace::ergo_initialize();
3885
3886 // Set compiler flags after GC is selected and GC specific
3887 // flags (LoopStripMiningIter) are set.
3888 CompilerConfig::ergo_initialize();
3889
3890 // Set bytecode rewriting flags
3891 set_bytecode_flags();
3892
3893 // Set flags if aggressive optimization flags are enabled
3894 jint code = set_aggressive_opts_flags();
3895 if (code != JNI_OK) {
3896 return code;
3897 }
3898
3899 // Turn off biased locking for locking debug mode flags,
3900 // which are subtly different from each other but neither works with
3901 // biased locking
3902 if (UseHeavyMonitors
3903 #ifdef COMPILER1
3904 || !UseFastLocking
3905 #endif // COMPILER1
3906 #if INCLUDE_JVMCI
3907 || !JVMCIUseFastLocking
3908 #endif
3909 ) {
3910 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3911 // flag set to true on command line; warn the user that they
3912 // can't enable biased locking here
3913 warning("Biased Locking is not supported with locking debug flags"
3914 "; ignoring UseBiasedLocking flag." );
3915 }
3916 UseBiasedLocking = false;
3917 }
3918
3919 #ifdef CC_INTERP
3920 // Clear flags not supported on zero.
3921 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3922 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3923 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3924 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3925 #endif // CC_INTERP
3926
3927 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3928 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3929 DebugNonSafepoints = true;
3930 }
3931
3932 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3933 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3934 }
3935
3936 // Treat the odd case where local verification is enabled but remote
3937 // verification is not as if both were enabled.
3938 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3939 log_info(verification)("Turning on remote verification because local verification is on");
3940 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3941 }
3942
3943 #ifndef PRODUCT
3944 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3945 if (use_vm_log()) {
3946 LogVMOutput = true;
3947 }
3948 }
3949 #endif // PRODUCT
3950
3951 if (PrintCommandLineFlags) {
3952 JVMFlag::printSetFlags(tty);
3953 }
3954
3955 // Apply CPU specific policy for the BiasedLocking
3956 if (UseBiasedLocking) {
3957 if (!VM_Version::use_biased_locking() &&
3958 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3959 UseBiasedLocking = false;
3960 }
3961 }
3962 #ifdef COMPILER2
3963 if (!UseBiasedLocking) {
3964 UseOptoBiasInlining = false;
3965 }
3966 #endif
3967
3968 #if defined(IA32)
3969 // Only server compiler can optimize safepoints well enough.
3970 if (!is_server_compilation_mode_vm()) {
3971 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
3972 }
3973 #endif
3974
3975 // ThreadLocalHandshakesConstraintFunc handles the constraints.
3976 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
3977 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
3978 } else {
3979 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
3980 }
3981
3982 return JNI_OK;
3983 }
3984
3985 jint Arguments::adjust_after_os() {
3986 if (UseNUMA) {
3987 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
3988 FLAG_SET_ERGO(bool, UseNUMA, false);
3989 } else if (UseParallelGC || UseParallelOldGC) {
3990 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3991 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3992 }
3993 }
3994 // UseNUMAInterleaving is set to ON for all collectors and
3995 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3996 // such as the parallel collector for Linux and Solaris will
3997 // interleave old gen and survivor spaces on top of NUMA
3998 // allocation policy for the eden space.
3999 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4000 // all platforms and ParallelGC on Windows will interleave all
4001 // of the heap spaces across NUMA nodes.
4002 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4003 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4004 }
4005 }
4006 return JNI_OK;
4007 }
4008
4009 int Arguments::PropertyList_count(SystemProperty* pl) {
4010 int count = 0;
4011 while(pl != NULL) {
4012 count++;
4013 pl = pl->next();
4014 }
4015 return count;
4016 }
4017
4018 // Return the number of readable properties.
4019 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4020 int count = 0;
4021 while(pl != NULL) {
4022 if (pl->is_readable()) {
4023 count++;
4024 }
4025 pl = pl->next();
4026 }
4027 return count;
4028 }
4029
4030 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4031 assert(key != NULL, "just checking");
4032 SystemProperty* prop;
4033 for (prop = pl; prop != NULL; prop = prop->next()) {
4034 if (strcmp(key, prop->key()) == 0) return prop->value();
4035 }
4036 return NULL;
4037 }
4038
4039 // Return the value of the requested property provided that it is a readable property.
4040 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4041 assert(key != NULL, "just checking");
4042 SystemProperty* prop;
4043 // Return the property value if the keys match and the property is not internal or
4044 // it's the special internal property "jdk.boot.class.path.append".
4045 for (prop = pl; prop != NULL; prop = prop->next()) {
4046 if (strcmp(key, prop->key()) == 0) {
4047 if (!prop->internal()) {
4048 return prop->value();
4049 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4050 return prop->value();
4051 } else {
4052 // Property is internal and not jdk.boot.class.path.append so return NULL.
4053 return NULL;
4054 }
4055 }
4056 }
4057 return NULL;
4058 }
4059
4060 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4061 int count = 0;
4062 const char* ret_val = NULL;
4063
4064 while(pl != NULL) {
4065 if(count >= index) {
4066 ret_val = pl->key();
4067 break;
4068 }
4069 count++;
4070 pl = pl->next();
4071 }
4072
4073 return ret_val;
4074 }
4075
4076 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4077 int count = 0;
4078 char* ret_val = NULL;
4079
4080 while(pl != NULL) {
4081 if(count >= index) {
4082 ret_val = pl->value();
4083 break;
4084 }
4085 count++;
4086 pl = pl->next();
4087 }
4088
4089 return ret_val;
4090 }
4091
4092 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4093 SystemProperty* p = *plist;
4094 if (p == NULL) {
4095 *plist = new_p;
4096 } else {
4097 while (p->next() != NULL) {
4098 p = p->next();
4099 }
4100 p->set_next(new_p);
4101 }
4102 }
4103
4104 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4105 bool writeable, bool internal) {
4106 if (plist == NULL)
4107 return;
4108
4109 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4110 PropertyList_add(plist, new_p);
4111 }
4112
4113 void Arguments::PropertyList_add(SystemProperty *element) {
4114 PropertyList_add(&_system_properties, element);
4115 }
4116
4117 // This add maintains unique property key in the list.
4118 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4119 PropertyAppendable append, PropertyWriteable writeable,
4120 PropertyInternal internal) {
4121 if (plist == NULL)
4122 return;
4123
4124 // If property key exist then update with new value.
4125 SystemProperty* prop;
4126 for (prop = *plist; prop != NULL; prop = prop->next()) {
4127 if (strcmp(k, prop->key()) == 0) {
4128 if (append == AppendProperty) {
4129 prop->append_value(v);
4130 } else {
4131 prop->set_value(v);
4132 }
4133 return;
4134 }
4135 }
4136
4137 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4138 }
4139
4140 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4141 // Returns true if all of the source pointed by src has been copied over to
4142 // the destination buffer pointed by buf. Otherwise, returns false.
4143 // Notes:
4144 // 1. If the length (buflen) of the destination buffer excluding the
4145 // NULL terminator character is not long enough for holding the expanded
4146 // pid characters, it also returns false instead of returning the partially
4147 // expanded one.
4148 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4149 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4150 char* buf, size_t buflen) {
4151 const char* p = src;
4152 char* b = buf;
4153 const char* src_end = &src[srclen];
4154 char* buf_end = &buf[buflen - 1];
4155
4156 while (p < src_end && b < buf_end) {
4157 if (*p == '%') {
4158 switch (*(++p)) {
4159 case '%': // "%%" ==> "%"
4160 *b++ = *p++;
4161 break;
4162 case 'p': { // "%p" ==> current process id
4163 // buf_end points to the character before the last character so
4164 // that we could write '\0' to the end of the buffer.
4165 size_t buf_sz = buf_end - b + 1;
4166 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4167
4168 // if jio_snprintf fails or the buffer is not long enough to hold
4169 // the expanded pid, returns false.
4170 if (ret < 0 || ret >= (int)buf_sz) {
4171 return false;
4172 } else {
4173 b += ret;
4174 assert(*b == '\0', "fail in copy_expand_pid");
4175 if (p == src_end && b == buf_end + 1) {
4176 // reach the end of the buffer.
4177 return true;
4178 }
4179 }
4180 p++;
4181 break;
4182 }
4183 default :
4184 *b++ = '%';
4185 }
4186 } else {
4187 *b++ = *p++;
4188 }
4189 }
4190 *b = '\0';
4191 return (p == src_end); // return false if not all of the source was copied
4192 }