1 /*
2 * Copyright (c) 1997, 2018, 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/arguments_ext.hpp"
45 #include "runtime/flags/jvmFlag.hpp"
46 #include "runtime/flags/jvmFlagConstraintList.hpp"
47 #include "runtime/flags/jvmFlagWriteableList.hpp"
48 #include "runtime/flags/jvmFlagRangeList.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.inline.hpp"
52 #include "runtime/safepoint.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64 #if INCLUDE_JFR
65 #include "jfr/jfr.hpp"
66 #endif
67
68 // Note: This is a special bug reporting site for the JVM
69 #ifdef VENDOR_URL_VM_BUG
70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
71 #else
72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
73 #endif
74 #define DEFAULT_JAVA_LAUNCHER "generic"
75
76 char* Arguments::_jvm_flags_file = NULL;
77 char** Arguments::_jvm_flags_array = NULL;
78 int Arguments::_num_jvm_flags = 0;
79 char** Arguments::_jvm_args_array = NULL;
80 int Arguments::_num_jvm_args = 0;
81 char* Arguments::_java_command = NULL;
82 SystemProperty* Arguments::_system_properties = NULL;
83 const char* Arguments::_gc_log_filename = NULL;
84 size_t Arguments::_conservative_max_heap_alignment = 0;
85 size_t Arguments::_min_heap_size = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 bool Arguments::_enable_preview = false;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 abort_hook_t Arguments::_abort_hook = NULL;
110 exit_hook_t Arguments::_exit_hook = NULL;
111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
115 SystemProperty *Arguments::_java_library_path = NULL;
116 SystemProperty *Arguments::_java_home = NULL;
117 SystemProperty *Arguments::_java_class_path = NULL;
118 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
119 SystemProperty *Arguments::_vm_info = NULL;
120
121 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
122 PathString *Arguments::_system_boot_class_path = NULL;
123 bool Arguments::_has_jimage = false;
124
125 char* Arguments::_ext_dirs = NULL;
126
127 bool PathString::set_value(const char *value) {
128 if (_value != NULL) {
129 FreeHeap(_value);
130 }
131 _value = AllocateHeap(strlen(value)+1, mtArguments);
132 assert(_value != NULL, "Unable to allocate space for new path value");
133 if (_value != NULL) {
134 strcpy(_value, value);
135 } else {
136 // not able to allocate
137 return false;
138 }
139 return true;
140 }
141
142 void PathString::append_value(const char *value) {
143 char *sp;
144 size_t len = 0;
145 if (value != NULL) {
146 len = strlen(value);
147 if (_value != NULL) {
148 len += strlen(_value);
149 }
150 sp = AllocateHeap(len+2, mtArguments);
151 assert(sp != NULL, "Unable to allocate space for new append path value");
152 if (sp != NULL) {
153 if (_value != NULL) {
154 strcpy(sp, _value);
155 strcat(sp, os::path_separator());
156 strcat(sp, value);
157 FreeHeap(_value);
158 } else {
159 strcpy(sp, value);
160 }
161 _value = sp;
162 }
163 }
164 }
165
166 PathString::PathString(const char* value) {
167 if (value == NULL) {
168 _value = NULL;
169 } else {
170 _value = AllocateHeap(strlen(value)+1, mtArguments);
171 strcpy(_value, value);
172 }
173 }
174
175 PathString::~PathString() {
176 if (_value != NULL) {
177 FreeHeap(_value);
178 _value = NULL;
179 }
180 }
181
182 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
183 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
184 size_t len = strlen(module_name) + 1;
185 _module_name = AllocateHeap(len, mtInternal);
186 strncpy(_module_name, module_name, len); // copy the trailing null
187 _path = new PathString(path);
188 }
189
190 ModulePatchPath::~ModulePatchPath() {
191 if (_module_name != NULL) {
192 FreeHeap(_module_name);
193 _module_name = NULL;
194 }
195 if (_path != NULL) {
196 delete _path;
197 _path = NULL;
198 }
199 }
200
201 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
202 if (key == NULL) {
203 _key = NULL;
204 } else {
205 _key = AllocateHeap(strlen(key)+1, mtArguments);
206 strcpy(_key, key);
207 }
208 _next = NULL;
209 _internal = internal;
210 _writeable = writeable;
211 }
212
213 AgentLibrary::AgentLibrary(const char* name, const char* options,
214 bool is_absolute_path, void* os_lib,
215 bool instrument_lib) {
216 _name = AllocateHeap(strlen(name)+1, mtArguments);
217 strcpy(_name, name);
218 if (options == NULL) {
219 _options = NULL;
220 } else {
221 _options = AllocateHeap(strlen(options)+1, mtArguments);
222 strcpy(_options, options);
223 }
224 _is_absolute_path = is_absolute_path;
225 _os_lib = os_lib;
226 _next = NULL;
227 _state = agent_invalid;
228 _is_static_lib = false;
229 _is_instrument_lib = instrument_lib;
230 }
231
232 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
233 // part of the option string.
234 static bool match_option(const JavaVMOption *option, const char* name,
235 const char** tail) {
236 size_t len = strlen(name);
237 if (strncmp(option->optionString, name, len) == 0) {
238 *tail = option->optionString + len;
239 return true;
240 } else {
241 return false;
242 }
243 }
244
245 // Check if 'option' matches 'name'. No "tail" is allowed.
246 static bool match_option(const JavaVMOption *option, const char* name) {
247 const char* tail = NULL;
248 bool result = match_option(option, name, &tail);
249 if (tail != NULL && *tail == '\0') {
250 return result;
251 } else {
252 return false;
253 }
254 }
255
256 // Return true if any of the strings in null-terminated array 'names' matches.
257 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
258 // the option must match exactly.
259 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
260 bool tail_allowed) {
261 for (/* empty */; *names != NULL; ++names) {
262 if (match_option(option, *names, tail)) {
263 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
264 return true;
265 }
266 }
267 }
268 return false;
269 }
270
271 #if INCLUDE_JFR
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 return Jfr::on_flight_recorder_option(option, tail);
280 }
281 return false;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
330 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
331 }
332
333 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
334 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
335 return ((strncmp(option, property, len) == 0) &&
336 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
337 }
338
339 // Return true if property starts with "jdk.module." and its ensuing chars match
340 // any of the reserved module properties.
341 // property should be passed without the leading "-D".
342 bool Arguments::is_internal_module_property(const char* property) {
343 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
347 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
348 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
349 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
350 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
351 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
352 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
353 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
354 return true;
355 }
356 }
357 return false;
358 }
359
360 // Process java launcher properties.
361 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
362 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
363 // sun.java.launcher.pid is defined.
364 // Must do this before setting up other system properties,
365 // as some of them may depend on launcher type.
366 for (int index = 0; index < args->nOptions; index++) {
367 const JavaVMOption* option = args->options + index;
368 const char* tail;
369
370 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
371 process_java_launcher_argument(tail, option->extraInfo);
372 continue;
373 }
374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
375 if (strcmp(tail, "true") == 0) {
376 _sun_java_launcher_is_altjvm = true;
377 }
378 continue;
379 }
380 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
381 _sun_java_launcher_pid = atoi(tail);
382 continue;
383 }
384 }
385 }
386
387 // Initialize system properties key and value.
388 void Arguments::init_system_properties() {
389
390 // Set up _system_boot_class_path which is not a property but
391 // relies heavily on argument processing and the jdk.boot.class.path.append
392 // property. It is used to store the underlying system boot class path.
393 _system_boot_class_path = new PathString(NULL);
394
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
396 "Java Virtual Machine Specification", false));
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
399 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
400
401 // Initialize the vm.info now, but it will need updating after argument parsing.
402 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
403
404 // Following are JVMTI agent writable properties.
405 // Properties values are set to NULL and they are
406 // os specific they are initialized in os::init_system_properties_values().
407 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
408 _java_library_path = new SystemProperty("java.library.path", NULL, true);
409 _java_home = new SystemProperty("java.home", NULL, true);
410 _java_class_path = new SystemProperty("java.class.path", "", true);
411 // jdk.boot.class.path.append is a non-writeable, internal property.
412 // It can only be set by either:
413 // - -Xbootclasspath/a:
414 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
415 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
416
417 // Add to System Property list.
418 PropertyList_add(&_system_properties, _sun_boot_library_path);
419 PropertyList_add(&_system_properties, _java_library_path);
420 PropertyList_add(&_system_properties, _java_home);
421 PropertyList_add(&_system_properties, _java_class_path);
422 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
423 PropertyList_add(&_system_properties, _vm_info);
424
425 // Set OS specific system properties values
426 os::init_system_properties_values();
427 }
428
429 // Update/Initialize System properties after JDK version number is known
430 void Arguments::init_version_specific_system_properties() {
431 enum { bufsz = 16 };
432 char buffer[bufsz];
433 const char* spec_vendor = "Oracle Corporation";
434 uint32_t spec_version = JDK_Version::current().major_version();
435
436 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
437
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.version", buffer, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
444 }
445
446 /*
447 * -XX argument processing:
448 *
449 * -XX arguments are defined in several places, such as:
450 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
451 * -XX arguments are parsed in parse_argument().
452 * -XX argument bounds checking is done in check_vm_args_consistency().
453 *
454 * Over time -XX arguments may change. There are mechanisms to handle common cases:
455 *
456 * ALIASED: An option that is simply another name for another option. This is often
457 * part of the process of deprecating a flag, but not all aliases need
458 * to be deprecated.
459 *
460 * Create an alias for an option by adding the old and new option names to the
461 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
462 *
463 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
464 * support may be removed in the future. Both regular and aliased options may be
465 * deprecated.
466 *
467 * Add a deprecation warning for an option (or alias) by adding an entry in the
468 * "special_jvm_flags" table and setting the "deprecated_in" field.
469 * Often an option "deprecated" in one major release will
470 * be made "obsolete" in the next. In this case the entry should also have its
471 * "obsolete_in" field set.
472 *
473 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
474 * on the command line. A warning is printed to let the user know that option might not
475 * be accepted in the future.
476 *
477 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
478 * table and setting the "obsolete_in" field.
479 *
480 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
481 * to the current JDK version. The system will flatly refuse to admit the existence of
482 * the flag. This allows a flag to die automatically over JDK releases.
483 *
484 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
485 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
486 * - Newly obsolete or expired deprecated options should have their global variable
487 * definitions removed (from globals.hpp, etc) and related implementations removed.
488 *
489 * Recommended approach for removing options:
490 *
491 * To remove options commonly used by customers (e.g. product -XX options), use
492 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
493 *
494 * To remove internal options (e.g. diagnostic, experimental, develop options), use
495 * a 2-step model adding major release numbers to the obsolete and expire columns.
496 *
497 * To change the name of an option, use the alias table as well as a 2-step
498 * model adding major release numbers to the deprecate and expire columns.
499 * Think twice about aliasing commonly used customer options.
500 *
501 * There are times when it is appropriate to leave a future release number as undefined.
502 *
503 * Tests: Aliases should be tested in VMAliasOptions.java.
504 * Deprecated options should be tested in VMDeprecatedOptions.java.
505 */
506
507 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
508 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
509 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
510 // the command-line as usual, but will issue a warning.
511 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
512 // the command-line, while issuing a warning and ignoring the flag value.
513 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
514 // existence of the flag.
515 //
516 // MANUAL CLEANUP ON JDK VERSION UPDATES:
517 // This table ensures that the handling of options will update automatically when the JDK
518 // version is incremented, but the source code needs to be cleanup up manually:
519 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
520 // variable should be removed, as well as users of the variable.
521 // - As "deprecated" options age into "obsolete" options, move the entry into the
522 // "Obsolete Flags" section of the table.
523 // - All expired options should be removed from the table.
524 static SpecialFlag const special_jvm_flags[] = {
525 // -------------- Deprecated Flags --------------
526 // --- Non-alias flags - sorted by obsolete_in then expired_in:
527 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
529 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
530 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
537 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
538 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
539
540 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
541 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
542 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
543 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
544 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
545 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
546
547 // -------------- Obsolete Flags - sorted by expired_in --------------
548 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
549 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
550 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
551 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
552 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
553 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
554 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
555 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
556 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
557 { "TraceScavenge", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
558 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
559 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
560 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
561 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
562 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
563 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
564 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
565 { "InlineNotify", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
566 { "EnableTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
567 { "UseLockedTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
568 { "NativeMonitorTimeout", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
569 { "NativeMonitorSpinLimit", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
570 { "NativeMonitorFlags", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
571 { "UnlinkSymbolsALot", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
572 { "AllowNonVirtualCalls", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
573 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
574 { "PrintSafepointStatisticsTimeout",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
575 { "PrintSafepointStatisticsCount", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
576 { "TransmitErrorReport", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
577 { "ErrorReportServer", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
578 { "EmitSync", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
579 { "SyncVerbose", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
580 { "SyncFlags", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
581 { "SyncKnobs", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
582
583 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
584 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
585 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
586 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
587 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
588 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
589 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
590 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
591 #endif
592
593 { NULL, JDK_Version(0), JDK_Version(0) }
594 };
595
596 // Flags that are aliases for other flags.
597 typedef struct {
598 const char* alias_name;
599 const char* real_name;
600 } AliasedFlag;
601
602 static AliasedFlag const aliased_jvm_flags[] = {
603 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
604 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
605 { NULL, NULL}
606 };
607
608 // NOTE: A compatibility request will be necessary for each alias to be removed.
609 static AliasedLoggingFlag const aliased_logging_flags[] = {
610 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
611 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
612 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
613 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
614 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
615 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
616 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
617 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
618 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
619 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
620 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
621 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
622 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
623 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
624 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
625 };
626
627 #ifndef PRODUCT
628 // These options are removed in jdk9. Remove this code for jdk10.
629 static AliasedFlag const removed_develop_logging_flags[] = {
630 { "TraceClassInitialization", "-Xlog:class+init" },
631 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
632 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
633 { "TraceItables", "-Xlog:itables=debug" },
634 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
635 { "TraceSafepoint", "-Xlog:safepoint=debug" },
636 { "TraceStartupTime", "-Xlog:startuptime" },
637 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
638 { "PrintVtables", "-Xlog:vtables=debug" },
639 { "VerboseVerification", "-Xlog:verification" },
640 { NULL, NULL }
641 };
642 #endif //PRODUCT
643
644 // Return true if "v" is less than "other", where "other" may be "undefined".
645 static bool version_less_than(JDK_Version v, JDK_Version other) {
646 assert(!v.is_undefined(), "must be defined");
647 if (!other.is_undefined() && v.compare(other) >= 0) {
648 return false;
649 } else {
650 return true;
651 }
652 }
653
654 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
655
656 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
657 // Allow extensions to have priority
658 if (lookup_special_flag_ext(flag_name, flag)) {
659 return true;
660 }
661
662 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
663 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
664 flag = special_jvm_flags[i];
665 return true;
666 }
667 }
668 return false;
669 }
670
671 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
672 assert(version != NULL, "Must provide a version buffer");
673 SpecialFlag flag;
674 if (lookup_special_flag(flag_name, flag)) {
675 if (!flag.obsolete_in.is_undefined()) {
676 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
677 *version = flag.obsolete_in;
678 return true;
679 }
680 }
681 }
682 return false;
683 }
684
685 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
686 assert(version != NULL, "Must provide a version buffer");
687 SpecialFlag flag;
688 if (lookup_special_flag(flag_name, flag)) {
689 if (!flag.deprecated_in.is_undefined()) {
690 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
691 version_less_than(JDK_Version::current(), flag.expired_in)) {
692 *version = flag.deprecated_in;
693 return 1;
694 } else {
695 return -1;
696 }
697 }
698 }
699 return 0;
700 }
701
702 #ifndef PRODUCT
703 const char* Arguments::removed_develop_logging_flag_name(const char* name){
704 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
705 const AliasedFlag& flag = removed_develop_logging_flags[i];
706 if (strcmp(flag.alias_name, name) == 0) {
707 return flag.real_name;
708 }
709 }
710 return NULL;
711 }
712 #endif // PRODUCT
713
714 const char* Arguments::real_flag_name(const char *flag_name) {
715 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
716 const AliasedFlag& flag_status = aliased_jvm_flags[i];
717 if (strcmp(flag_status.alias_name, flag_name) == 0) {
718 return flag_status.real_name;
719 }
720 }
721 return flag_name;
722 }
723
724 #ifdef ASSERT
725 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
726 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
727 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
728 return true;
729 }
730 }
731 return false;
732 }
733
734 // Verifies the correctness of the entries in the special_jvm_flags table.
735 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
736 // version being earlier than the deprecation version, then a warning is issued
737 // and verification fails - by returning false. If it is detected that the table
738 // is out of date, with respect to the current version, then a warning is issued
739 // but verification does not fail. This allows the VM to operate when the version
740 // is first updated, without needing to update all the impacted flags at the
741 // same time.
742 static bool verify_special_jvm_flags() {
743 bool success = true;
744 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
745 const SpecialFlag& flag = special_jvm_flags[i];
746 if (lookup_special_flag(flag.name, i)) {
747 warning("Duplicate special flag declaration \"%s\"", flag.name);
748 success = false;
749 }
750 if (flag.deprecated_in.is_undefined() &&
751 flag.obsolete_in.is_undefined()) {
752 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
753 success = false;
754 }
755
756 if (!flag.deprecated_in.is_undefined()) {
757 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
758 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
759 success = false;
760 }
761
762 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
763 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
764 success = false;
765 }
766 }
767
768 if (!flag.obsolete_in.is_undefined()) {
769 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
770 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
771 success = false;
772 }
773
774 // if flag has become obsolete it should not have a "globals" flag defined anymore.
775 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
776 if (JVMFlag::find_flag(flag.name) != NULL) {
777 // Temporarily disable the warning: 8196739
778 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
779 }
780 }
781 }
782
783 if (!flag.expired_in.is_undefined()) {
784 // if flag has become expired it should not have a "globals" flag defined anymore.
785 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
786 if (JVMFlag::find_flag(flag.name) != NULL) {
787 // Temporarily disable the warning: 8196739
788 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
789 }
790 }
791 }
792
793 }
794 return success;
795 }
796 #endif
797
798 // Parses a size specification string.
799 bool Arguments::atojulong(const char *s, julong* result) {
800 julong n = 0;
801
802 // First char must be a digit. Don't allow negative numbers or leading spaces.
803 if (!isdigit(*s)) {
804 return false;
805 }
806
807 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
808 char* remainder;
809 errno = 0;
810 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
811 if (errno != 0) {
812 return false;
813 }
814
815 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
816 if (remainder == s || strlen(remainder) > 1) {
817 return false;
818 }
819
820 switch (*remainder) {
821 case 'T': case 't':
822 *result = n * G * K;
823 // Check for overflow.
824 if (*result/((julong)G * K) != n) return false;
825 return true;
826 case 'G': case 'g':
827 *result = n * G;
828 if (*result/G != n) return false;
829 return true;
830 case 'M': case 'm':
831 *result = n * M;
832 if (*result/M != n) return false;
833 return true;
834 case 'K': case 'k':
835 *result = n * K;
836 if (*result/K != n) return false;
837 return true;
838 case '\0':
839 *result = n;
840 return true;
841 default:
842 return false;
843 }
844 }
845
846 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
847 if (size < min_size) return arg_too_small;
848 if (size > max_size) return arg_too_big;
849 return arg_in_range;
850 }
851
852 // Describe an argument out of range error
853 void Arguments::describe_range_error(ArgsRange errcode) {
854 switch(errcode) {
855 case arg_too_big:
856 jio_fprintf(defaultStream::error_stream(),
857 "The specified size exceeds the maximum "
858 "representable size.\n");
859 break;
860 case arg_too_small:
861 case arg_unreadable:
862 case arg_in_range:
863 // do nothing for now
864 break;
865 default:
866 ShouldNotReachHere();
867 }
868 }
869
870 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
871 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
872 return true;
873 } else {
874 return false;
875 }
876 }
877
878 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
879 char* end;
880 errno = 0;
881 double v = strtod(value, &end);
882 if ((errno != 0) || (*end != 0)) {
883 return false;
884 }
885
886 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
887 return true;
888 }
889 return false;
890 }
891
892 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
893 julong v;
894 int int_v;
895 intx intx_v;
896 bool is_neg = false;
897 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
898
899 if (result == NULL) {
900 return false;
901 }
902
903 // Check the sign first since atojulong() parses only unsigned values.
904 if (*value == '-') {
905 if (!result->is_intx() && !result->is_int()) {
906 return false;
907 }
908 value++;
909 is_neg = true;
910 }
911 if (!Arguments::atojulong(value, &v)) {
912 return false;
913 }
914 if (result->is_int()) {
915 int_v = (int) v;
916 if (is_neg) {
917 int_v = -int_v;
918 }
919 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
920 } else if (result->is_uint()) {
921 uint uint_v = (uint) v;
922 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
923 } else if (result->is_intx()) {
924 intx_v = (intx) v;
925 if (is_neg) {
926 intx_v = -intx_v;
927 }
928 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
929 } else if (result->is_uintx()) {
930 uintx uintx_v = (uintx) v;
931 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
932 } else if (result->is_uint64_t()) {
933 uint64_t uint64_t_v = (uint64_t) v;
934 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
935 } else if (result->is_size_t()) {
936 size_t size_t_v = (size_t) v;
937 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
938 } else if (result->is_double()) {
939 double double_v = (double) v;
940 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
941 } else {
942 return false;
943 }
944 }
945
946 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
947 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
948 // Contract: JVMFlag always returns a pointer that needs freeing.
949 FREE_C_HEAP_ARRAY(char, value);
950 return true;
951 }
952
953 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
954 const char* old_value = "";
955 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
956 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
957 size_t new_len = strlen(new_value);
958 const char* value;
959 char* free_this_too = NULL;
960 if (old_len == 0) {
961 value = new_value;
962 } else if (new_len == 0) {
963 value = old_value;
964 } else {
965 size_t length = old_len + 1 + new_len + 1;
966 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
967 // each new setting adds another LINE to the switch:
968 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
969 value = buf;
970 free_this_too = buf;
971 }
972 (void) JVMFlag::ccstrAtPut(name, &value, origin);
973 // JVMFlag always returns a pointer that needs freeing.
974 FREE_C_HEAP_ARRAY(char, value);
975 if (free_this_too != NULL) {
976 // JVMFlag made its own copy, so I must delete my own temp. buffer.
977 FREE_C_HEAP_ARRAY(char, free_this_too);
978 }
979 return true;
980 }
981
982 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
983 const char* real_name = real_flag_name(arg);
984 JDK_Version since = JDK_Version();
985 switch (is_deprecated_flag(arg, &since)) {
986 case -1:
987 return NULL; // obsolete or expired, don't process normally
988 case 0:
989 return real_name;
990 case 1: {
991 if (warn) {
992 char version[256];
993 since.to_string(version, sizeof(version));
994 if (real_name != arg) {
995 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
996 arg, version, real_name);
997 } else {
998 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
999 arg, version);
1000 }
1001 }
1002 return real_name;
1003 }
1004 }
1005 ShouldNotReachHere();
1006 return NULL;
1007 }
1008
1009 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1010 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1011 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1012 const int max_tagset_size = 256;
1013 int max_tagset_len = max_tagset_size - 1;
1014 char tagset_buffer[max_tagset_size];
1015 tagset_buffer[0] = '\0';
1016
1017 // Write tag-set for aliased logging option, in string list form
1018 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1019 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1020 if (i > 0) {
1021 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1022 }
1023 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1024 }
1025 if (!alf.exactMatch) {
1026 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1027 }
1028 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1029 (on) ? "+" : "-",
1030 name,
1031 tagset_buffer,
1032 (on) ? LogLevel::name(alf.level) : "off");
1033 }
1034
1035 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1036 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1037 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1038 if (strcmp(alf.alias_name, name) == 0) {
1039 log_deprecated_flag(name, on, alf);
1040 return alf;
1041 }
1042 }
1043 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1044 return a;
1045 }
1046
1047 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1048
1049 // range of acceptable characters spelled out for portability reasons
1050 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1051 #define BUFLEN 255
1052 char name[BUFLEN+1];
1053 char dummy;
1054 const char* real_name;
1055 bool warn_if_deprecated = true;
1056
1057 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1058 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1059 if (alf.alias_name != NULL){
1060 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1061 return true;
1062 }
1063 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1064 if (real_name == NULL) {
1065 return false;
1066 }
1067 return set_bool_flag(real_name, false, origin);
1068 }
1069 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1070 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1071 if (alf.alias_name != NULL){
1072 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1073 return true;
1074 }
1075 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1076 if (real_name == NULL) {
1077 return false;
1078 }
1079 return set_bool_flag(real_name, true, origin);
1080 }
1081
1082 char punct;
1083 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1084 const char* value = strchr(arg, '=') + 1;
1085 JVMFlag* flag;
1086
1087 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1088 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1089 if (alf.alias_name != NULL) {
1090 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1091 return true;
1092 }
1093 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1094 if (real_name == NULL) {
1095 return false;
1096 }
1097 flag = JVMFlag::find_flag(real_name);
1098 if (flag != NULL && flag->is_ccstr()) {
1099 if (flag->ccstr_accumulates()) {
1100 return append_to_string_flag(real_name, value, origin);
1101 } else {
1102 if (value[0] == '\0') {
1103 value = NULL;
1104 }
1105 return set_string_flag(real_name, value, origin);
1106 }
1107 } else {
1108 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1109 }
1110 }
1111
1112 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1113 const char* value = strchr(arg, '=') + 1;
1114 // -XX:Foo:=xxx will reset the string flag to the given value.
1115 if (value[0] == '\0') {
1116 value = NULL;
1117 }
1118 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1119 if (real_name == NULL) {
1120 return false;
1121 }
1122 return set_string_flag(real_name, value, origin);
1123 }
1124
1125 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1126 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1127 #define NUMBER_RANGE "[0123456789eE+-]"
1128 char value[BUFLEN + 1];
1129 char value2[BUFLEN + 1];
1130 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1131 // Looks like a floating-point number -- try again with more lenient format string
1132 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1133 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1134 if (real_name == NULL) {
1135 return false;
1136 }
1137 return set_fp_numeric_flag(real_name, value, origin);
1138 }
1139 }
1140
1141 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1142 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1143 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1144 if (real_name == NULL) {
1145 return false;
1146 }
1147 return set_numeric_flag(real_name, value, origin);
1148 }
1149
1150 return false;
1151 }
1152
1153 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1154 assert(bldarray != NULL, "illegal argument");
1155
1156 if (arg == NULL) {
1157 return;
1158 }
1159
1160 int new_count = *count + 1;
1161
1162 // expand the array and add arg to the last element
1163 if (*bldarray == NULL) {
1164 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1165 } else {
1166 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1167 }
1168 (*bldarray)[*count] = os::strdup_check_oom(arg);
1169 *count = new_count;
1170 }
1171
1172 void Arguments::build_jvm_args(const char* arg) {
1173 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1174 }
1175
1176 void Arguments::build_jvm_flags(const char* arg) {
1177 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1178 }
1179
1180 // utility function to return a string that concatenates all
1181 // strings in a given char** array
1182 const char* Arguments::build_resource_string(char** args, int count) {
1183 if (args == NULL || count == 0) {
1184 return NULL;
1185 }
1186 size_t length = 0;
1187 for (int i = 0; i < count; i++) {
1188 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1189 }
1190 char* s = NEW_RESOURCE_ARRAY(char, length);
1191 char* dst = s;
1192 for (int j = 0; j < count; j++) {
1193 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1194 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1195 dst += offset;
1196 length -= offset;
1197 }
1198 return (const char*) s;
1199 }
1200
1201 void Arguments::print_on(outputStream* st) {
1202 st->print_cr("VM Arguments:");
1203 if (num_jvm_flags() > 0) {
1204 st->print("jvm_flags: "); print_jvm_flags_on(st);
1205 st->cr();
1206 }
1207 if (num_jvm_args() > 0) {
1208 st->print("jvm_args: "); print_jvm_args_on(st);
1209 st->cr();
1210 }
1211 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1212 if (_java_class_path != NULL) {
1213 char* path = _java_class_path->value();
1214 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1215 }
1216 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1217 }
1218
1219 void Arguments::print_summary_on(outputStream* st) {
1220 // Print the command line. Environment variables that are helpful for
1221 // reproducing the problem are written later in the hs_err file.
1222 // flags are from setting file
1223 if (num_jvm_flags() > 0) {
1224 st->print_raw("Settings File: ");
1225 print_jvm_flags_on(st);
1226 st->cr();
1227 }
1228 // args are the command line and environment variable arguments.
1229 st->print_raw("Command Line: ");
1230 if (num_jvm_args() > 0) {
1231 print_jvm_args_on(st);
1232 }
1233 // this is the classfile and any arguments to the java program
1234 if (java_command() != NULL) {
1235 st->print("%s", java_command());
1236 }
1237 st->cr();
1238 }
1239
1240 void Arguments::print_jvm_flags_on(outputStream* st) {
1241 if (_num_jvm_flags > 0) {
1242 for (int i=0; i < _num_jvm_flags; i++) {
1243 st->print("%s ", _jvm_flags_array[i]);
1244 }
1245 }
1246 }
1247
1248 void Arguments::print_jvm_args_on(outputStream* st) {
1249 if (_num_jvm_args > 0) {
1250 for (int i=0; i < _num_jvm_args; i++) {
1251 st->print("%s ", _jvm_args_array[i]);
1252 }
1253 }
1254 }
1255
1256 bool Arguments::process_argument(const char* arg,
1257 jboolean ignore_unrecognized,
1258 JVMFlag::Flags origin) {
1259 JDK_Version since = JDK_Version();
1260
1261 if (parse_argument(arg, origin)) {
1262 return true;
1263 }
1264
1265 // Determine if the flag has '+', '-', or '=' characters.
1266 bool has_plus_minus = (*arg == '+' || *arg == '-');
1267 const char* const argname = has_plus_minus ? arg + 1 : arg;
1268
1269 size_t arg_len;
1270 const char* equal_sign = strchr(argname, '=');
1271 if (equal_sign == NULL) {
1272 arg_len = strlen(argname);
1273 } else {
1274 arg_len = equal_sign - argname;
1275 }
1276
1277 // Only make the obsolete check for valid arguments.
1278 if (arg_len <= BUFLEN) {
1279 // Construct a string which consists only of the argument name without '+', '-', or '='.
1280 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1281 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1282 if (is_obsolete_flag(stripped_argname, &since)) {
1283 char version[256];
1284 since.to_string(version, sizeof(version));
1285 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1286 return true;
1287 }
1288 #ifndef PRODUCT
1289 else {
1290 const char* replacement;
1291 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1292 log_warning(arguments)("%s has been removed. Please use %s instead.",
1293 stripped_argname,
1294 replacement);
1295 return false;
1296 }
1297 }
1298 #endif //PRODUCT
1299 }
1300
1301 // For locked flags, report a custom error message if available.
1302 // Otherwise, report the standard unrecognized VM option.
1303 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1304 if (found_flag != NULL) {
1305 char locked_message_buf[BUFLEN];
1306 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1307 if (strlen(locked_message_buf) == 0) {
1308 if (found_flag->is_bool() && !has_plus_minus) {
1309 jio_fprintf(defaultStream::error_stream(),
1310 "Missing +/- setting for VM option '%s'\n", argname);
1311 } else if (!found_flag->is_bool() && has_plus_minus) {
1312 jio_fprintf(defaultStream::error_stream(),
1313 "Unexpected +/- setting in VM option '%s'\n", argname);
1314 } else {
1315 jio_fprintf(defaultStream::error_stream(),
1316 "Improperly specified VM option '%s'\n", argname);
1317 }
1318 } else {
1319 #ifdef PRODUCT
1320 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1321 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1322 if (ignore_unrecognized && mismatched) {
1323 return true;
1324 }
1325 #endif
1326 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1327 }
1328 } else {
1329 if (ignore_unrecognized) {
1330 return true;
1331 }
1332 jio_fprintf(defaultStream::error_stream(),
1333 "Unrecognized VM option '%s'\n", argname);
1334 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1335 if (fuzzy_matched != NULL) {
1336 jio_fprintf(defaultStream::error_stream(),
1337 "Did you mean '%s%s%s'? ",
1338 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1339 fuzzy_matched->_name,
1340 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1341 }
1342 }
1343
1344 // allow for commandline "commenting out" options like -XX:#+Verbose
1345 return arg[0] == '#';
1346 }
1347
1348 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1349 FILE* stream = fopen(file_name, "rb");
1350 if (stream == NULL) {
1351 if (should_exist) {
1352 jio_fprintf(defaultStream::error_stream(),
1353 "Could not open settings file %s\n", file_name);
1354 return false;
1355 } else {
1356 return true;
1357 }
1358 }
1359
1360 char token[1024];
1361 int pos = 0;
1362
1363 bool in_white_space = true;
1364 bool in_comment = false;
1365 bool in_quote = false;
1366 char quote_c = 0;
1367 bool result = true;
1368
1369 int c = getc(stream);
1370 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1371 if (in_white_space) {
1372 if (in_comment) {
1373 if (c == '\n') in_comment = false;
1374 } else {
1375 if (c == '#') in_comment = true;
1376 else if (!isspace(c)) {
1377 in_white_space = false;
1378 token[pos++] = c;
1379 }
1380 }
1381 } else {
1382 if (c == '\n' || (!in_quote && isspace(c))) {
1383 // token ends at newline, or at unquoted whitespace
1384 // this allows a way to include spaces in string-valued options
1385 token[pos] = '\0';
1386 logOption(token);
1387 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1388 build_jvm_flags(token);
1389 pos = 0;
1390 in_white_space = true;
1391 in_quote = false;
1392 } else if (!in_quote && (c == '\'' || c == '"')) {
1393 in_quote = true;
1394 quote_c = c;
1395 } else if (in_quote && (c == quote_c)) {
1396 in_quote = false;
1397 } else {
1398 token[pos++] = c;
1399 }
1400 }
1401 c = getc(stream);
1402 }
1403 if (pos > 0) {
1404 token[pos] = '\0';
1405 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1406 build_jvm_flags(token);
1407 }
1408 fclose(stream);
1409 return result;
1410 }
1411
1412 //=============================================================================================================
1413 // Parsing of properties (-D)
1414
1415 const char* Arguments::get_property(const char* key) {
1416 return PropertyList_get_value(system_properties(), key);
1417 }
1418
1419 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1420 const char* eq = strchr(prop, '=');
1421 const char* key;
1422 const char* value = "";
1423
1424 if (eq == NULL) {
1425 // property doesn't have a value, thus use passed string
1426 key = prop;
1427 } else {
1428 // property have a value, thus extract it and save to the
1429 // allocated string
1430 size_t key_len = eq - prop;
1431 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1432
1433 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1434 key = tmp_key;
1435
1436 value = &prop[key_len + 1];
1437 }
1438
1439 if (strcmp(key, "java.compiler") == 0) {
1440 process_java_compiler_argument(value);
1441 // Record value in Arguments, but let it get passed to Java.
1442 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1443 strcmp(key, "sun.java.launcher.pid") == 0) {
1444 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1445 // private and are processed in process_sun_java_launcher_properties();
1446 // the sun.java.launcher property is passed on to the java application
1447 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1448 // append is true, writable is true, internal is false
1449 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1450 WriteableProperty, ExternalProperty);
1451 } else {
1452 if (strcmp(key, "sun.java.command") == 0) {
1453 char *old_java_command = _java_command;
1454 _java_command = os::strdup_check_oom(value, mtArguments);
1455 if (old_java_command != NULL) {
1456 os::free(old_java_command);
1457 }
1458 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1459 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1460 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1461 // its value without going through the property list or making a Java call.
1462 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1463 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1464 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1465 os::free((void *)old_java_vendor_url_bug);
1466 }
1467 }
1468
1469 // Create new property and add at the end of the list
1470 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1471 }
1472
1473 if (key != prop) {
1474 // SystemProperty copy passed value, thus free previously allocated
1475 // memory
1476 FreeHeap((void *)key);
1477 }
1478
1479 return true;
1480 }
1481
1482 #if INCLUDE_CDS
1483 const char* unsupported_properties[] = { "jdk.module.limitmods",
1484 "jdk.module.upgrade.path",
1485 "jdk.module.patch.0" };
1486 const char* unsupported_options[] = { "--limit-modules",
1487 "--upgrade-module-path",
1488 "--patch-module"
1489 };
1490 void Arguments::check_unsupported_dumping_properties() {
1491 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1492 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1493 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1494 SystemProperty* sp = system_properties();
1495 while (sp != NULL) {
1496 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1497 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1498 vm_exit_during_initialization(
1499 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1500 }
1501 }
1502 sp = sp->next();
1503 }
1504
1505 // Check for an exploded module build in use with -Xshare:dump.
1506 if (!has_jimage()) {
1507 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1508 }
1509 }
1510
1511 bool Arguments::check_unsupported_cds_runtime_properties() {
1512 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1513 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1514 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1515 if (get_property(unsupported_properties[i]) != NULL) {
1516 if (RequireSharedSpaces) {
1517 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1518 }
1519 return true;
1520 }
1521 }
1522 return false;
1523 }
1524 #endif
1525
1526 //===========================================================================================================
1527 // Setting int/mixed/comp mode flags
1528
1529 void Arguments::set_mode_flags(Mode mode) {
1530 // Set up default values for all flags.
1531 // If you add a flag to any of the branches below,
1532 // add a default value for it here.
1533 set_java_compiler(false);
1534 _mode = mode;
1535
1536 // Ensure Agent_OnLoad has the correct initial values.
1537 // This may not be the final mode; mode may change later in onload phase.
1538 PropertyList_unique_add(&_system_properties, "java.vm.info",
1539 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1540
1541 UseInterpreter = true;
1542 UseCompiler = true;
1543 UseLoopCounter = true;
1544
1545 // Default values may be platform/compiler dependent -
1546 // use the saved values
1547 ClipInlining = Arguments::_ClipInlining;
1548 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1549 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1550 BackgroundCompilation = Arguments::_BackgroundCompilation;
1551 if (TieredCompilation) {
1552 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1553 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1554 }
1555 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1556 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1557 }
1558 }
1559
1560 // Change from defaults based on mode
1561 switch (mode) {
1562 default:
1563 ShouldNotReachHere();
1564 break;
1565 case _int:
1566 UseCompiler = false;
1567 UseLoopCounter = false;
1568 AlwaysCompileLoopMethods = false;
1569 UseOnStackReplacement = false;
1570 break;
1571 case _mixed:
1572 // same as default
1573 break;
1574 case _comp:
1575 UseInterpreter = false;
1576 BackgroundCompilation = false;
1577 ClipInlining = false;
1578 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1579 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1580 // compile a level 4 (C2) and then continue executing it.
1581 if (TieredCompilation) {
1582 Tier3InvokeNotifyFreqLog = 0;
1583 Tier4InvocationThreshold = 0;
1584 }
1585 break;
1586 }
1587 }
1588
1589 // Conflict: required to use shared spaces (-Xshare:on), but
1590 // incompatible command line options were chosen.
1591 static void no_shared_spaces(const char* message) {
1592 if (RequireSharedSpaces) {
1593 jio_fprintf(defaultStream::error_stream(),
1594 "Class data sharing is inconsistent with other specified options.\n");
1595 vm_exit_during_initialization("Unable to use shared archive", message);
1596 } else {
1597 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1598 }
1599 }
1600
1601 void set_object_alignment() {
1602 // Object alignment.
1603 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1604 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1605 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1606 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1607 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1608 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1609
1610 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1611 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1612
1613 // Oop encoding heap max
1614 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1615
1616 if (SurvivorAlignmentInBytes == 0) {
1617 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1618 }
1619 }
1620
1621 size_t Arguments::max_heap_for_compressed_oops() {
1622 // Avoid sign flip.
1623 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1624 // We need to fit both the NULL page and the heap into the memory budget, while
1625 // keeping alignment constraints of the heap. To guarantee the latter, as the
1626 // NULL page is located before the heap, we pad the NULL page to the conservative
1627 // maximum alignment that the GC may ever impose upon the heap.
1628 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1629 _conservative_max_heap_alignment);
1630
1631 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1632 NOT_LP64(ShouldNotReachHere(); return 0);
1633 }
1634
1635 void Arguments::set_use_compressed_oops() {
1636 #ifndef ZERO
1637 #ifdef _LP64
1638 // MaxHeapSize is not set up properly at this point, but
1639 // the only value that can override MaxHeapSize if we are
1640 // to use UseCompressedOops is InitialHeapSize.
1641 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1642
1643 if (max_heap_size <= max_heap_for_compressed_oops()) {
1644 #if !defined(COMPILER1) || defined(TIERED)
1645 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1646 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1647 }
1648 #endif
1649 } else {
1650 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1651 warning("Max heap size too large for Compressed Oops");
1652 FLAG_SET_DEFAULT(UseCompressedOops, false);
1653 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1654 }
1655 }
1656 #endif // _LP64
1657 #endif // ZERO
1658 }
1659
1660
1661 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1662 // set_use_compressed_oops().
1663 void Arguments::set_use_compressed_klass_ptrs() {
1664 #ifndef ZERO
1665 #ifdef _LP64
1666 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1667 if (!UseCompressedOops) {
1668 if (UseCompressedClassPointers) {
1669 warning("UseCompressedClassPointers requires UseCompressedOops");
1670 }
1671 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1672 } else {
1673 // Turn on UseCompressedClassPointers too
1674 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1675 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1676 }
1677 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1678 if (UseCompressedClassPointers) {
1679 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1680 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1681 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1682 }
1683 }
1684 }
1685 #endif // _LP64
1686 #endif // !ZERO
1687 }
1688
1689 void Arguments::set_conservative_max_heap_alignment() {
1690 // The conservative maximum required alignment for the heap is the maximum of
1691 // the alignments imposed by several sources: any requirements from the heap
1692 // itself, the collector policy and the maximum page size we may run the VM
1693 // with.
1694 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1695 _conservative_max_heap_alignment = MAX4(heap_alignment,
1696 (size_t)os::vm_allocation_granularity(),
1697 os::max_page_size(),
1698 CollectorPolicy::compute_heap_alignment());
1699 }
1700
1701 jint Arguments::set_ergonomics_flags() {
1702 GCConfig::initialize();
1703
1704 set_conservative_max_heap_alignment();
1705
1706 #ifndef ZERO
1707 #ifdef _LP64
1708 set_use_compressed_oops();
1709
1710 // set_use_compressed_klass_ptrs() must be called after calling
1711 // set_use_compressed_oops().
1712 set_use_compressed_klass_ptrs();
1713
1714 // Also checks that certain machines are slower with compressed oops
1715 // in vm_version initialization code.
1716 #endif // _LP64
1717 #endif // !ZERO
1718
1719 return JNI_OK;
1720 }
1721
1722 julong Arguments::limit_by_allocatable_memory(julong limit) {
1723 julong max_allocatable;
1724 julong result = limit;
1725 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1726 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1727 }
1728 return result;
1729 }
1730
1731 // Use static initialization to get the default before parsing
1732 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1733
1734 void Arguments::set_heap_size() {
1735 julong phys_mem =
1736 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1737 : (julong)MaxRAM;
1738
1739 // Convert deprecated flags
1740 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1741 !FLAG_IS_DEFAULT(MaxRAMFraction))
1742 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1743
1744 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1745 !FLAG_IS_DEFAULT(MinRAMFraction))
1746 MinRAMPercentage = 100.0 / MinRAMFraction;
1747
1748 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1749 !FLAG_IS_DEFAULT(InitialRAMFraction))
1750 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1751
1752 // If the maximum heap size has not been set with -Xmx,
1753 // then set it as fraction of the size of physical memory,
1754 // respecting the maximum and minimum sizes of the heap.
1755 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1756 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1757 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1758 if (reasonable_min < MaxHeapSize) {
1759 // Small physical memory, so use a minimum fraction of it for the heap
1760 reasonable_max = reasonable_min;
1761 } else {
1762 // Not-small physical memory, so require a heap at least
1763 // as large as MaxHeapSize
1764 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1765 }
1766
1767 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1768 // Limit the heap size to ErgoHeapSizeLimit
1769 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1770 }
1771 if (UseCompressedOops) {
1772 // Limit the heap size to the maximum possible when using compressed oops
1773 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1774
1775 // HeapBaseMinAddress can be greater than default but not less than.
1776 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1777 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1778 // matches compressed oops printing flags
1779 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1780 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1781 DefaultHeapBaseMinAddress,
1782 DefaultHeapBaseMinAddress/G,
1783 HeapBaseMinAddress);
1784 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1785 }
1786 }
1787
1788 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1789 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1790 // but it should be not less than default MaxHeapSize.
1791 max_coop_heap -= HeapBaseMinAddress;
1792 }
1793 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1794 }
1795 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1796
1797 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1798 // An initial heap size was specified on the command line,
1799 // so be sure that the maximum size is consistent. Done
1800 // after call to limit_by_allocatable_memory because that
1801 // method might reduce the allocation size.
1802 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1803 }
1804
1805 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1806 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1807 }
1808
1809 // If the minimum or initial heap_size have not been set or requested to be set
1810 // ergonomically, set them accordingly.
1811 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1812 julong reasonable_minimum = (julong)(OldSize + NewSize);
1813
1814 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1815
1816 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1817
1818 if (InitialHeapSize == 0) {
1819 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1820
1821 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1822 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1823
1824 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1825
1826 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1827 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1828 }
1829 // If the minimum heap size has not been set (via -Xms),
1830 // synchronize with InitialHeapSize to avoid errors with the default value.
1831 if (min_heap_size() == 0) {
1832 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1833 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1834 }
1835 }
1836 }
1837
1838 // This option inspects the machine and attempts to set various
1839 // parameters to be optimal for long-running, memory allocation
1840 // intensive jobs. It is intended for machines with large
1841 // amounts of cpu and memory.
1842 jint Arguments::set_aggressive_heap_flags() {
1843 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1844 // VM, but we may not be able to represent the total physical memory
1845 // available (like having 8gb of memory on a box but using a 32bit VM).
1846 // Thus, we need to make sure we're using a julong for intermediate
1847 // calculations.
1848 julong initHeapSize;
1849 julong total_memory = os::physical_memory();
1850
1851 if (total_memory < (julong) 256 * M) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1854 vm_exit(1);
1855 }
1856
1857 // The heap size is half of available memory, or (at most)
1858 // all of possible memory less 160mb (leaving room for the OS
1859 // when using ISM). This is the maximum; because adaptive sizing
1860 // is turned on below, the actual space used may be smaller.
1861
1862 initHeapSize = MIN2(total_memory / (julong) 2,
1863 total_memory - (julong) 160 * M);
1864
1865 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1866
1867 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1868 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1869 return JNI_EINVAL;
1870 }
1871 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1872 return JNI_EINVAL;
1873 }
1874 // Currently the minimum size and the initial heap sizes are the same.
1875 set_min_heap_size(initHeapSize);
1876 }
1877 if (FLAG_IS_DEFAULT(NewSize)) {
1878 // Make the young generation 3/8ths of the total heap.
1879 if (FLAG_SET_CMDLINE(size_t, NewSize,
1880 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1881 return JNI_EINVAL;
1882 }
1883 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1884 return JNI_EINVAL;
1885 }
1886 }
1887
1888 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1889 FLAG_SET_DEFAULT(UseLargePages, true);
1890 #endif
1891
1892 // Increase some data structure sizes for efficiency
1893 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1894 return JNI_EINVAL;
1895 }
1896 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
1897 return JNI_EINVAL;
1898 }
1899 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1900 return JNI_EINVAL;
1901 }
1902
1903 // See the OldPLABSize comment below, but replace 'after promotion'
1904 // with 'after copying'. YoungPLABSize is the size of the survivor
1905 // space per-gc-thread buffers. The default is 4kw.
1906 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1907 return JNI_EINVAL;
1908 }
1909
1910 // OldPLABSize is the size of the buffers in the old gen that
1911 // UseParallelGC uses to promote live data that doesn't fit in the
1912 // survivor spaces. At any given time, there's one for each gc thread.
1913 // The default size is 1kw. These buffers are rarely used, since the
1914 // survivor spaces are usually big enough. For specjbb, however, there
1915 // are occasions when there's lots of live data in the young gen
1916 // and we end up promoting some of it. We don't have a definite
1917 // explanation for why bumping OldPLABSize helps, but the theory
1918 // is that a bigger PLAB results in retaining something like the
1919 // original allocation order after promotion, which improves mutator
1920 // locality. A minor effect may be that larger PLABs reduce the
1921 // number of PLAB allocation events during gc. The value of 8kw
1922 // was arrived at by experimenting with specjbb.
1923 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1924 return JNI_EINVAL;
1925 }
1926
1927 // Enable parallel GC and adaptive generation sizing
1928 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
1929 return JNI_EINVAL;
1930 }
1931
1932 // Encourage steady state memory management
1933 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1934 return JNI_EINVAL;
1935 }
1936
1937 // This appears to improve mutator locality
1938 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1939 return JNI_EINVAL;
1940 }
1941
1942 // Get around early Solaris scheduling bug
1943 // (affinity vs other jobs on system)
1944 // but disallow DR and offlining (5008695).
1945 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1946 return JNI_EINVAL;
1947 }
1948
1949 return JNI_OK;
1950 }
1951
1952 // This must be called after ergonomics.
1953 void Arguments::set_bytecode_flags() {
1954 if (!RewriteBytecodes) {
1955 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1956 }
1957 }
1958
1959 // Aggressive optimization flags -XX:+AggressiveOpts
1960 jint Arguments::set_aggressive_opts_flags() {
1961 #ifdef COMPILER2
1962 if (AggressiveUnboxing) {
1963 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1964 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1965 } else if (!EliminateAutoBox) {
1966 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1967 AggressiveUnboxing = false;
1968 }
1969 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1970 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1971 } else if (!DoEscapeAnalysis) {
1972 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1973 AggressiveUnboxing = false;
1974 }
1975 }
1976 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1977 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1978 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1979 }
1980 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1981 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1982 }
1983
1984 // Feed the cache size setting into the JDK
1985 char buffer[1024];
1986 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1987 if (!add_property(buffer)) {
1988 return JNI_ENOMEM;
1989 }
1990 }
1991 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1992 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1993 }
1994 #endif
1995
1996 if (AggressiveOpts) {
1997 // Sample flag setting code
1998 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1999 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2000 // }
2001 }
2002
2003 return JNI_OK;
2004 }
2005
2006 //===========================================================================================================
2007 // Parsing of java.compiler property
2008
2009 void Arguments::process_java_compiler_argument(const char* arg) {
2010 // For backwards compatibility, Djava.compiler=NONE or ""
2011 // causes us to switch to -Xint mode UNLESS -Xdebug
2012 // is also specified.
2013 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2014 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2015 }
2016 }
2017
2018 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2019 _sun_java_launcher = os::strdup_check_oom(launcher);
2020 }
2021
2022 bool Arguments::created_by_java_launcher() {
2023 assert(_sun_java_launcher != NULL, "property must have value");
2024 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2025 }
2026
2027 bool Arguments::sun_java_launcher_is_altjvm() {
2028 return _sun_java_launcher_is_altjvm;
2029 }
2030
2031 //===========================================================================================================
2032 // Parsing of main arguments
2033
2034 unsigned int addreads_count = 0;
2035 unsigned int addexports_count = 0;
2036 unsigned int addopens_count = 0;
2037 unsigned int addmods_count = 0;
2038 unsigned int patch_mod_count = 0;
2039
2040 // Check the consistency of vm_init_args
2041 bool Arguments::check_vm_args_consistency() {
2042 // Method for adding checks for flag consistency.
2043 // The intent is to warn the user of all possible conflicts,
2044 // before returning an error.
2045 // Note: Needs platform-dependent factoring.
2046 bool status = true;
2047
2048 if (TLABRefillWasteFraction == 0) {
2049 jio_fprintf(defaultStream::error_stream(),
2050 "TLABRefillWasteFraction should be a denominator, "
2051 "not " SIZE_FORMAT "\n",
2052 TLABRefillWasteFraction);
2053 status = false;
2054 }
2055
2056 if (PrintNMTStatistics) {
2057 #if INCLUDE_NMT
2058 if (MemTracker::tracking_level() == NMT_off) {
2059 #endif // INCLUDE_NMT
2060 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2061 PrintNMTStatistics = false;
2062 #if INCLUDE_NMT
2063 }
2064 #endif
2065 }
2066
2067 status = CompilerConfig::check_args_consistency(status);
2068 #if INCLUDE_JVMCI
2069 if (status && EnableJVMCI) {
2070 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2071 AddProperty, UnwriteableProperty, InternalProperty);
2072 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2073 return false;
2074 }
2075 }
2076 #endif
2077
2078 #ifndef SUPPORT_RESERVED_STACK_AREA
2079 if (StackReservedPages != 0) {
2080 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2081 warning("Reserved Stack Area not supported on this platform");
2082 }
2083 #endif
2084
2085 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2086 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2087 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2088 }
2089 }
2090 return status;
2091 }
2092
2093 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2094 const char* option_type) {
2095 if (ignore) return false;
2096
2097 const char* spacer = " ";
2098 if (option_type == NULL) {
2099 option_type = ++spacer; // Set both to the empty string.
2100 }
2101
2102 if (os::obsolete_option(option)) {
2103 jio_fprintf(defaultStream::error_stream(),
2104 "Obsolete %s%soption: %s\n", option_type, spacer,
2105 option->optionString);
2106 return false;
2107 } else {
2108 jio_fprintf(defaultStream::error_stream(),
2109 "Unrecognized %s%soption: %s\n", option_type, spacer,
2110 option->optionString);
2111 return true;
2112 }
2113 }
2114
2115 static const char* user_assertion_options[] = {
2116 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2117 };
2118
2119 static const char* system_assertion_options[] = {
2120 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2121 };
2122
2123 bool Arguments::parse_uintx(const char* value,
2124 uintx* uintx_arg,
2125 uintx min_size) {
2126
2127 // Check the sign first since atojulong() parses only unsigned values.
2128 bool value_is_positive = !(*value == '-');
2129
2130 if (value_is_positive) {
2131 julong n;
2132 bool good_return = atojulong(value, &n);
2133 if (good_return) {
2134 bool above_minimum = n >= min_size;
2135 bool value_is_too_large = n > max_uintx;
2136
2137 if (above_minimum && !value_is_too_large) {
2138 *uintx_arg = n;
2139 return true;
2140 }
2141 }
2142 }
2143 return false;
2144 }
2145
2146 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2147 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2148 char* property = AllocateHeap(prop_len, mtArguments);
2149 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2150 if (ret < 0 || ret >= (int)prop_len) {
2151 FreeHeap(property);
2152 return false;
2153 }
2154 bool added = add_property(property, UnwriteableProperty, internal);
2155 FreeHeap(property);
2156 return added;
2157 }
2158
2159 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2160 const unsigned int props_count_limit = 1000;
2161 const int max_digits = 3;
2162 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2163
2164 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2165 if (count < props_count_limit) {
2166 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2167 char* property = AllocateHeap(prop_len, mtArguments);
2168 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2169 if (ret < 0 || ret >= (int)prop_len) {
2170 FreeHeap(property);
2171 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2172 return false;
2173 }
2174 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2175 FreeHeap(property);
2176 return added;
2177 }
2178
2179 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2180 return false;
2181 }
2182
2183 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2184 julong* long_arg,
2185 julong min_size,
2186 julong max_size) {
2187 if (!atojulong(s, long_arg)) return arg_unreadable;
2188 return check_memory_size(*long_arg, min_size, max_size);
2189 }
2190
2191 // Parse JavaVMInitArgs structure
2192
2193 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2194 const JavaVMInitArgs *java_options_args,
2195 const JavaVMInitArgs *cmd_line_args) {
2196 bool patch_mod_javabase = false;
2197
2198 // Save default settings for some mode flags
2199 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2200 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2201 Arguments::_ClipInlining = ClipInlining;
2202 Arguments::_BackgroundCompilation = BackgroundCompilation;
2203 if (TieredCompilation) {
2204 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2205 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2206 }
2207
2208 // Setup flags for mixed which is the default
2209 set_mode_flags(_mixed);
2210
2211 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2212 // variable (if present).
2213 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2214 if (result != JNI_OK) {
2215 return result;
2216 }
2217
2218 // Parse args structure generated from the command line flags.
2219 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2220 if (result != JNI_OK) {
2221 return result;
2222 }
2223
2224 // Parse args structure generated from the _JAVA_OPTIONS environment
2225 // variable (if present) (mimics classic VM)
2226 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2227 if (result != JNI_OK) {
2228 return result;
2229 }
2230
2231 // We need to ensure processor and memory resources have been properly
2232 // configured - which may rely on arguments we just processed - before
2233 // doing the final argument processing. Any argument processing that
2234 // needs to know about processor and memory resources must occur after
2235 // this point.
2236
2237 os::init_container_support();
2238
2239 // Do final processing now that all arguments have been parsed
2240 result = finalize_vm_init_args(patch_mod_javabase);
2241 if (result != JNI_OK) {
2242 return result;
2243 }
2244
2245 return JNI_OK;
2246 }
2247
2248 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2249 // represents a valid JDWP agent. is_path==true denotes that we
2250 // are dealing with -agentpath (case where name is a path), otherwise with
2251 // -agentlib
2252 bool valid_jdwp_agent(char *name, bool is_path) {
2253 char *_name;
2254 const char *_jdwp = "jdwp";
2255 size_t _len_jdwp, _len_prefix;
2256
2257 if (is_path) {
2258 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2259 return false;
2260 }
2261
2262 _name++; // skip past last path separator
2263 _len_prefix = strlen(JNI_LIB_PREFIX);
2264
2265 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2266 return false;
2267 }
2268
2269 _name += _len_prefix;
2270 _len_jdwp = strlen(_jdwp);
2271
2272 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2273 _name += _len_jdwp;
2274 }
2275 else {
2276 return false;
2277 }
2278
2279 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2280 return false;
2281 }
2282
2283 return true;
2284 }
2285
2286 if (strcmp(name, _jdwp) == 0) {
2287 return true;
2288 }
2289
2290 return false;
2291 }
2292
2293 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2294 // --patch-module=<module>=<file>(<pathsep><file>)*
2295 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2296 // Find the equal sign between the module name and the path specification
2297 const char* module_equal = strchr(patch_mod_tail, '=');
2298 if (module_equal == NULL) {
2299 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2300 return JNI_ERR;
2301 } else {
2302 // Pick out the module name
2303 size_t module_len = module_equal - patch_mod_tail;
2304 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2305 if (module_name != NULL) {
2306 memcpy(module_name, patch_mod_tail, module_len);
2307 *(module_name + module_len) = '\0';
2308 // The path piece begins one past the module_equal sign
2309 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2310 FREE_C_HEAP_ARRAY(char, module_name);
2311 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2312 return JNI_ENOMEM;
2313 }
2314 } else {
2315 return JNI_ENOMEM;
2316 }
2317 }
2318 return JNI_OK;
2319 }
2320
2321 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2322 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2323 // The min and max sizes match the values in globals.hpp, but scaled
2324 // with K. The values have been chosen so that alignment with page
2325 // size doesn't change the max value, which makes the conversions
2326 // back and forth between Xss value and ThreadStackSize value easier.
2327 // The values have also been chosen to fit inside a 32-bit signed type.
2328 const julong min_ThreadStackSize = 0;
2329 const julong max_ThreadStackSize = 1 * M;
2330
2331 const julong min_size = min_ThreadStackSize * K;
2332 const julong max_size = max_ThreadStackSize * K;
2333
2334 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2335
2336 julong size = 0;
2337 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2338 if (errcode != arg_in_range) {
2339 bool silent = (option == NULL); // Allow testing to silence error messages
2340 if (!silent) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Invalid thread stack size: %s\n", option->optionString);
2343 describe_range_error(errcode);
2344 }
2345 return JNI_EINVAL;
2346 }
2347
2348 // Internally track ThreadStackSize in units of 1024 bytes.
2349 const julong size_aligned = align_up(size, K);
2350 assert(size <= size_aligned,
2351 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2352 size, size_aligned);
2353
2354 const julong size_in_K = size_aligned / K;
2355 assert(size_in_K < (julong)max_intx,
2356 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2357 size_in_K);
2358
2359 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2360 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2361 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2362 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2363 max_expanded, size_in_K);
2364
2365 *out_ThreadStackSize = (intx)size_in_K;
2366
2367 return JNI_OK;
2368 }
2369
2370 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2371 // For match_option to return remaining or value part of option string
2372 const char* tail;
2373
2374 // iterate over arguments
2375 for (int index = 0; index < args->nOptions; index++) {
2376 bool is_absolute_path = false; // for -agentpath vs -agentlib
2377
2378 const JavaVMOption* option = args->options + index;
2379
2380 if (!match_option(option, "-Djava.class.path", &tail) &&
2381 !match_option(option, "-Dsun.java.command", &tail) &&
2382 !match_option(option, "-Dsun.java.launcher", &tail)) {
2383
2384 // add all jvm options to the jvm_args string. This string
2385 // is used later to set the java.vm.args PerfData string constant.
2386 // the -Djava.class.path and the -Dsun.java.command options are
2387 // omitted from jvm_args string as each have their own PerfData
2388 // string constant object.
2389 build_jvm_args(option->optionString);
2390 }
2391
2392 // -verbose:[class/module/gc/jni]
2393 if (match_option(option, "-verbose", &tail)) {
2394 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2395 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2396 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2397 } else if (!strcmp(tail, ":module")) {
2398 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2399 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2400 } else if (!strcmp(tail, ":gc")) {
2401 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2402 } else if (!strcmp(tail, ":jni")) {
2403 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2404 return JNI_EINVAL;
2405 }
2406 }
2407 // -da / -ea / -disableassertions / -enableassertions
2408 // These accept an optional class/package name separated by a colon, e.g.,
2409 // -da:java.lang.Thread.
2410 } else if (match_option(option, user_assertion_options, &tail, true)) {
2411 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2412 if (*tail == '\0') {
2413 JavaAssertions::setUserClassDefault(enable);
2414 } else {
2415 assert(*tail == ':', "bogus match by match_option()");
2416 JavaAssertions::addOption(tail + 1, enable);
2417 }
2418 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2419 } else if (match_option(option, system_assertion_options, &tail, false)) {
2420 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2421 JavaAssertions::setSystemClassDefault(enable);
2422 // -bootclasspath:
2423 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2424 jio_fprintf(defaultStream::output_stream(),
2425 "-Xbootclasspath is no longer a supported option.\n");
2426 return JNI_EINVAL;
2427 // -bootclasspath/a:
2428 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2429 Arguments::append_sysclasspath(tail);
2430 // -bootclasspath/p:
2431 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2432 jio_fprintf(defaultStream::output_stream(),
2433 "-Xbootclasspath/p is no longer a supported option.\n");
2434 return JNI_EINVAL;
2435 // -Xrun
2436 } else if (match_option(option, "-Xrun", &tail)) {
2437 if (tail != NULL) {
2438 const char* pos = strchr(tail, ':');
2439 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2440 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2441 jio_snprintf(name, len + 1, "%s", tail);
2442
2443 char *options = NULL;
2444 if(pos != NULL) {
2445 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2446 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2447 }
2448 #if !INCLUDE_JVMTI
2449 if (strcmp(name, "jdwp") == 0) {
2450 jio_fprintf(defaultStream::error_stream(),
2451 "Debugging agents are not supported in this VM\n");
2452 return JNI_ERR;
2453 }
2454 #endif // !INCLUDE_JVMTI
2455 add_init_library(name, options);
2456 }
2457 } else if (match_option(option, "--add-reads=", &tail)) {
2458 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2459 return JNI_ENOMEM;
2460 }
2461 } else if (match_option(option, "--add-exports=", &tail)) {
2462 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2463 return JNI_ENOMEM;
2464 }
2465 } else if (match_option(option, "--add-opens=", &tail)) {
2466 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2467 return JNI_ENOMEM;
2468 }
2469 } else if (match_option(option, "--add-modules=", &tail)) {
2470 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2471 return JNI_ENOMEM;
2472 }
2473 } else if (match_option(option, "--limit-modules=", &tail)) {
2474 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2475 return JNI_ENOMEM;
2476 }
2477 } else if (match_option(option, "--module-path=", &tail)) {
2478 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2479 return JNI_ENOMEM;
2480 }
2481 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2482 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2483 return JNI_ENOMEM;
2484 }
2485 } else if (match_option(option, "--patch-module=", &tail)) {
2486 // --patch-module=<module>=<file>(<pathsep><file>)*
2487 int res = process_patch_mod_option(tail, patch_mod_javabase);
2488 if (res != JNI_OK) {
2489 return res;
2490 }
2491 } else if (match_option(option, "--illegal-access=", &tail)) {
2492 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2493 return JNI_ENOMEM;
2494 }
2495 // -agentlib and -agentpath
2496 } else if (match_option(option, "-agentlib:", &tail) ||
2497 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2498 if(tail != NULL) {
2499 const char* pos = strchr(tail, '=');
2500 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2501 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2502 name[len] = '\0';
2503
2504 char *options = NULL;
2505 if(pos != NULL) {
2506 options = os::strdup_check_oom(pos + 1, mtArguments);
2507 }
2508 #if !INCLUDE_JVMTI
2509 if (valid_jdwp_agent(name, is_absolute_path)) {
2510 jio_fprintf(defaultStream::error_stream(),
2511 "Debugging agents are not supported in this VM\n");
2512 return JNI_ERR;
2513 }
2514 #endif // !INCLUDE_JVMTI
2515 add_init_agent(name, options, is_absolute_path);
2516 }
2517 // -javaagent
2518 } else if (match_option(option, "-javaagent:", &tail)) {
2519 #if !INCLUDE_JVMTI
2520 jio_fprintf(defaultStream::error_stream(),
2521 "Instrumentation agents are not supported in this VM\n");
2522 return JNI_ERR;
2523 #else
2524 if (tail != NULL) {
2525 size_t length = strlen(tail) + 1;
2526 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2527 jio_snprintf(options, length, "%s", tail);
2528 add_instrument_agent("instrument", options, false);
2529 // java agents need module java.instrument
2530 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2531 return JNI_ENOMEM;
2532 }
2533 }
2534 #endif // !INCLUDE_JVMTI
2535 // --enable_preview
2536 } else if (match_option(option, "--enable-preview")) {
2537 set_enable_preview();
2538 // -Xnoclassgc
2539 } else if (match_option(option, "-Xnoclassgc")) {
2540 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2541 return JNI_EINVAL;
2542 }
2543 // -Xconcgc
2544 } else if (match_option(option, "-Xconcgc")) {
2545 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2546 return JNI_EINVAL;
2547 }
2548 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2549 // -Xnoconcgc
2550 } else if (match_option(option, "-Xnoconcgc")) {
2551 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2552 return JNI_EINVAL;
2553 }
2554 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2555 // -Xbatch
2556 } else if (match_option(option, "-Xbatch")) {
2557 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2558 return JNI_EINVAL;
2559 }
2560 // -Xmn for compatibility with other JVM vendors
2561 } else if (match_option(option, "-Xmn", &tail)) {
2562 julong long_initial_young_size = 0;
2563 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2564 if (errcode != arg_in_range) {
2565 jio_fprintf(defaultStream::error_stream(),
2566 "Invalid initial young generation size: %s\n", option->optionString);
2567 describe_range_error(errcode);
2568 return JNI_EINVAL;
2569 }
2570 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2571 return JNI_EINVAL;
2572 }
2573 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2574 return JNI_EINVAL;
2575 }
2576 // -Xms
2577 } else if (match_option(option, "-Xms", &tail)) {
2578 julong long_initial_heap_size = 0;
2579 // an initial heap size of 0 means automatically determine
2580 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2581 if (errcode != arg_in_range) {
2582 jio_fprintf(defaultStream::error_stream(),
2583 "Invalid initial heap size: %s\n", option->optionString);
2584 describe_range_error(errcode);
2585 return JNI_EINVAL;
2586 }
2587 set_min_heap_size((size_t)long_initial_heap_size);
2588 // Currently the minimum size and the initial heap sizes are the same.
2589 // Can be overridden with -XX:InitialHeapSize.
2590 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2591 return JNI_EINVAL;
2592 }
2593 // -Xmx
2594 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2595 julong long_max_heap_size = 0;
2596 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2597 if (errcode != arg_in_range) {
2598 jio_fprintf(defaultStream::error_stream(),
2599 "Invalid maximum heap size: %s\n", option->optionString);
2600 describe_range_error(errcode);
2601 return JNI_EINVAL;
2602 }
2603 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2604 return JNI_EINVAL;
2605 }
2606 // Xmaxf
2607 } else if (match_option(option, "-Xmaxf", &tail)) {
2608 char* err;
2609 int maxf = (int)(strtod(tail, &err) * 100);
2610 if (*err != '\0' || *tail == '\0') {
2611 jio_fprintf(defaultStream::error_stream(),
2612 "Bad max heap free percentage size: %s\n",
2613 option->optionString);
2614 return JNI_EINVAL;
2615 } else {
2616 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2617 return JNI_EINVAL;
2618 }
2619 }
2620 // Xminf
2621 } else if (match_option(option, "-Xminf", &tail)) {
2622 char* err;
2623 int minf = (int)(strtod(tail, &err) * 100);
2624 if (*err != '\0' || *tail == '\0') {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Bad min heap free percentage size: %s\n",
2627 option->optionString);
2628 return JNI_EINVAL;
2629 } else {
2630 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2631 return JNI_EINVAL;
2632 }
2633 }
2634 // -Xss
2635 } else if (match_option(option, "-Xss", &tail)) {
2636 intx value = 0;
2637 jint err = parse_xss(option, tail, &value);
2638 if (err != JNI_OK) {
2639 return err;
2640 }
2641 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2645 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2646 julong long_ReservedCodeCacheSize = 0;
2647
2648 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2649 if (errcode != arg_in_range) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Invalid maximum code cache size: %s.\n", option->optionString);
2652 return JNI_EINVAL;
2653 }
2654 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2655 return JNI_EINVAL;
2656 }
2657 // -green
2658 } else if (match_option(option, "-green")) {
2659 jio_fprintf(defaultStream::error_stream(),
2660 "Green threads support not available\n");
2661 return JNI_EINVAL;
2662 // -native
2663 } else if (match_option(option, "-native")) {
2664 // HotSpot always uses native threads, ignore silently for compatibility
2665 // -Xrs
2666 } else if (match_option(option, "-Xrs")) {
2667 // Classic/EVM option, new functionality
2668 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 // -Xprof
2672 } else if (match_option(option, "-Xprof")) {
2673 char version[256];
2674 // Obsolete in JDK 10
2675 JDK_Version::jdk(10).to_string(version, sizeof(version));
2676 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2677 // -Xconcurrentio
2678 } else if (match_option(option, "-Xconcurrentio")) {
2679 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != JVMFlag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2686 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != JVMFlag::SUCCESS) { // 20Kb per thread added to new generation
2690 return JNI_EINVAL;
2691 }
2692
2693 // -Xinternalversion
2694 } else if (match_option(option, "-Xinternalversion")) {
2695 jio_fprintf(defaultStream::output_stream(), "%s\n",
2696 VM_Version::internal_vm_info_string());
2697 vm_exit(0);
2698 #ifndef PRODUCT
2699 // -Xprintflags
2700 } else if (match_option(option, "-Xprintflags")) {
2701 JVMFlag::printFlags(tty, false);
2702 vm_exit(0);
2703 #endif
2704 // -D
2705 } else if (match_option(option, "-D", &tail)) {
2706 const char* value;
2707 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2708 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2709 // abort if -Djava.endorsed.dirs is set
2710 jio_fprintf(defaultStream::output_stream(),
2711 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2712 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2713 return JNI_EINVAL;
2714 }
2715 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2716 *value != '\0' && strcmp(value, "\"\"") != 0) {
2717 // abort if -Djava.ext.dirs is set
2718 jio_fprintf(defaultStream::output_stream(),
2719 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2720 return JNI_EINVAL;
2721 }
2722 // Check for module related properties. They must be set using the modules
2723 // options. For example: use "--add-modules=java.sql", not
2724 // "-Djdk.module.addmods=java.sql"
2725 if (is_internal_module_property(option->optionString + 2)) {
2726 needs_module_property_warning = true;
2727 continue;
2728 }
2729
2730 if (!add_property(tail)) {
2731 return JNI_ENOMEM;
2732 }
2733 // Out of the box management support
2734 if (match_option(option, "-Dcom.sun.management", &tail)) {
2735 #if INCLUDE_MANAGEMENT
2736 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 // management agent in module jdk.management.agent
2740 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2741 return JNI_ENOMEM;
2742 }
2743 #else
2744 jio_fprintf(defaultStream::output_stream(),
2745 "-Dcom.sun.management is not supported in this VM.\n");
2746 return JNI_ERR;
2747 #endif
2748 }
2749 // -Xint
2750 } else if (match_option(option, "-Xint")) {
2751 set_mode_flags(_int);
2752 // -Xmixed
2753 } else if (match_option(option, "-Xmixed")) {
2754 set_mode_flags(_mixed);
2755 // -Xcomp
2756 } else if (match_option(option, "-Xcomp")) {
2757 // for testing the compiler; turn off all flags that inhibit compilation
2758 set_mode_flags(_comp);
2759 // -Xshare:dump
2760 } else if (match_option(option, "-Xshare:dump")) {
2761 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 set_mode_flags(_int); // Prevent compilation, which creates objects
2765 // -Xshare:on
2766 } else if (match_option(option, "-Xshare:on")) {
2767 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 // -Xshare:auto
2774 } else if (match_option(option, "-Xshare:auto")) {
2775 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 // -Xshare:off
2782 } else if (match_option(option, "-Xshare:off")) {
2783 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2787 return JNI_EINVAL;
2788 }
2789 // -Xverify
2790 } else if (match_option(option, "-Xverify", &tail)) {
2791 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2792 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2793 return JNI_EINVAL;
2794 }
2795 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2796 return JNI_EINVAL;
2797 }
2798 } else if (strcmp(tail, ":remote") == 0) {
2799 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2800 return JNI_EINVAL;
2801 }
2802 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 } else if (strcmp(tail, ":none") == 0) {
2806 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2807 return JNI_EINVAL;
2808 }
2809 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2813 return JNI_EINVAL;
2814 }
2815 // -Xdebug
2816 } else if (match_option(option, "-Xdebug")) {
2817 // note this flag has been used, then ignore
2818 set_xdebug_mode(true);
2819 // -Xnoagent
2820 } else if (match_option(option, "-Xnoagent")) {
2821 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2822 } else if (match_option(option, "-Xloggc:", &tail)) {
2823 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2824 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2825 _gc_log_filename = os::strdup_check_oom(tail);
2826 } else if (match_option(option, "-Xlog", &tail)) {
2827 bool ret = false;
2828 if (strcmp(tail, ":help") == 0) {
2829 fileStream stream(defaultStream::output_stream());
2830 LogConfiguration::print_command_line_help(&stream);
2831 vm_exit(0);
2832 } else if (strcmp(tail, ":disable") == 0) {
2833 LogConfiguration::disable_logging();
2834 ret = true;
2835 } else if (*tail == '\0') {
2836 ret = LogConfiguration::parse_command_line_arguments();
2837 assert(ret, "-Xlog without arguments should never fail to parse");
2838 } else if (*tail == ':') {
2839 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2840 }
2841 if (ret == false) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2844 tail);
2845 return JNI_EINVAL;
2846 }
2847 // JNI hooks
2848 } else if (match_option(option, "-Xcheck", &tail)) {
2849 if (!strcmp(tail, ":jni")) {
2850 #if !INCLUDE_JNI_CHECK
2851 warning("JNI CHECKING is not supported in this VM");
2852 #else
2853 CheckJNICalls = true;
2854 #endif // INCLUDE_JNI_CHECK
2855 } else if (is_bad_option(option, args->ignoreUnrecognized,
2856 "check")) {
2857 return JNI_EINVAL;
2858 }
2859 } else if (match_option(option, "vfprintf")) {
2860 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2861 } else if (match_option(option, "exit")) {
2862 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2863 } else if (match_option(option, "abort")) {
2864 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2865 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2866 // and the last option wins.
2867 } else if (match_option(option, "-XX:+NeverTenure")) {
2868 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
2869 return JNI_EINVAL;
2870 }
2871 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2872 return JNI_EINVAL;
2873 }
2874 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2875 return JNI_EINVAL;
2876 }
2877 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2878 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2879 return JNI_EINVAL;
2880 }
2881 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2888 uintx max_tenuring_thresh = 0;
2889 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2892 return JNI_EINVAL;
2893 }
2894
2895 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898
2899 if (MaxTenuringThreshold == 0) {
2900 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 } else {
2907 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 }
2914 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2915 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2916 return JNI_EINVAL;
2917 }
2918 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2922 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2929 #if defined(DTRACE_ENABLED)
2930 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2931 return JNI_EINVAL;
2932 }
2933 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 #else // defined(DTRACE_ENABLED)
2943 jio_fprintf(defaultStream::error_stream(),
2944 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2945 return JNI_EINVAL;
2946 #endif // defined(DTRACE_ENABLED)
2947 #ifdef ASSERT
2948 } else if (match_option(option, "-XX:+FullGCALot")) {
2949 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
2950 return JNI_EINVAL;
2951 }
2952 // disable scavenge before parallel mark-compact
2953 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 #endif
2957 #if !INCLUDE_MANAGEMENT
2958 } else if (match_option(option, "-XX:+ManagementServer")) {
2959 jio_fprintf(defaultStream::error_stream(),
2960 "ManagementServer is not supported in this VM.\n");
2961 return JNI_ERR;
2962 #endif // INCLUDE_MANAGEMENT
2963 #if INCLUDE_JFR
2964 } else if (match_jfr_option(&option)) {
2965 return JNI_EINVAL;
2966 #endif
2967 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2968 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2969 // already been handled
2970 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2971 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2972 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2973 return JNI_EINVAL;
2974 }
2975 }
2976 // Unknown option
2977 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2978 return JNI_ERR;
2979 }
2980 }
2981
2982 // PrintSharedArchiveAndExit will turn on
2983 // -Xshare:on
2984 // -Xlog:class+path=info
2985 if (PrintSharedArchiveAndExit) {
2986 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2987 return JNI_EINVAL;
2988 }
2989 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2993 }
2994
2995 // Change the default value for flags which have different default values
2996 // when working with older JDKs.
2997 #ifdef LINUX
2998 if (JDK_Version::current().compare_major(6) <= 0 &&
2999 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3000 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3001 }
3002 #endif // LINUX
3003 fix_appclasspath();
3004 return JNI_OK;
3005 }
3006
3007 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3008 // For java.base check for duplicate --patch-module options being specified on the command line.
3009 // This check is only required for java.base, all other duplicate module specifications
3010 // will be checked during module system initialization. The module system initialization
3011 // will throw an ExceptionInInitializerError if this situation occurs.
3012 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3013 if (*patch_mod_javabase) {
3014 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3015 } else {
3016 *patch_mod_javabase = true;
3017 }
3018 }
3019
3020 // Create GrowableArray lazily, only if --patch-module has been specified
3021 if (_patch_mod_prefix == NULL) {
3022 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3023 }
3024
3025 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3026 }
3027
3028 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3029 //
3030 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3031 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3032 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3033 // path is treated as the current directory.
3034 //
3035 // This causes problems with CDS, which requires that all directories specified in the classpath
3036 // must be empty. In most cases, applications do NOT want to load classes from the current
3037 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3038 // scripts compatible with CDS.
3039 void Arguments::fix_appclasspath() {
3040 if (IgnoreEmptyClassPaths) {
3041 const char separator = *os::path_separator();
3042 const char* src = _java_class_path->value();
3043
3044 // skip over all the leading empty paths
3045 while (*src == separator) {
3046 src ++;
3047 }
3048
3049 char* copy = os::strdup_check_oom(src, mtArguments);
3050
3051 // trim all trailing empty paths
3052 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3053 *tail = '\0';
3054 }
3055
3056 char from[3] = {separator, separator, '\0'};
3057 char to [2] = {separator, '\0'};
3058 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3059 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3060 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3061 }
3062
3063 _java_class_path->set_writeable_value(copy);
3064 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3065 }
3066 }
3067
3068 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3069 // check if the default lib/endorsed directory exists; if so, error
3070 char path[JVM_MAXPATHLEN];
3071 const char* fileSep = os::file_separator();
3072 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3073
3074 DIR* dir = os::opendir(path);
3075 if (dir != NULL) {
3076 jio_fprintf(defaultStream::output_stream(),
3077 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3078 "in modular form will be supported via the concept of upgradeable modules.\n");
3079 os::closedir(dir);
3080 return JNI_ERR;
3081 }
3082
3083 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3084 dir = os::opendir(path);
3085 if (dir != NULL) {
3086 jio_fprintf(defaultStream::output_stream(),
3087 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3088 "Use -classpath instead.\n.");
3089 os::closedir(dir);
3090 return JNI_ERR;
3091 }
3092
3093 // This must be done after all arguments have been processed
3094 // and the container support has been initialized since AggressiveHeap
3095 // relies on the amount of total memory available.
3096 if (AggressiveHeap) {
3097 jint result = set_aggressive_heap_flags();
3098 if (result != JNI_OK) {
3099 return result;
3100 }
3101 }
3102
3103 // This must be done after all arguments have been processed.
3104 // java_compiler() true means set to "NONE" or empty.
3105 if (java_compiler() && !xdebug_mode()) {
3106 // For backwards compatibility, we switch to interpreted mode if
3107 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3108 // not specified.
3109 set_mode_flags(_int);
3110 }
3111
3112 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3113 // but like -Xint, leave compilation thresholds unaffected.
3114 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3115 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3116 set_mode_flags(_int);
3117 }
3118
3119 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3120 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3121 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3122 }
3123
3124 #if !COMPILER2_OR_JVMCI
3125 // Don't degrade server performance for footprint
3126 if (FLAG_IS_DEFAULT(UseLargePages) &&
3127 MaxHeapSize < LargePageHeapSizeThreshold) {
3128 // No need for large granularity pages w/small heaps.
3129 // Note that large pages are enabled/disabled for both the
3130 // Java heap and the code cache.
3131 FLAG_SET_DEFAULT(UseLargePages, false);
3132 }
3133
3134 UNSUPPORTED_OPTION(ProfileInterpreter);
3135 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3136 #endif
3137
3138 #ifndef TIERED
3139 // Tiered compilation is undefined.
3140 UNSUPPORTED_OPTION(TieredCompilation);
3141 #endif
3142
3143 if (!check_vm_args_consistency()) {
3144 return JNI_ERR;
3145 }
3146
3147 #if INCLUDE_CDS
3148 if (DumpSharedSpaces) {
3149 // Disable biased locking now as it interferes with the clean up of
3150 // the archived Klasses and Java string objects (at dump time only).
3151 UseBiasedLocking = false;
3152
3153 // Always verify non-system classes during CDS dump
3154 if (!BytecodeVerificationRemote) {
3155 BytecodeVerificationRemote = true;
3156 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3157 }
3158 }
3159 if (UseSharedSpaces && patch_mod_javabase) {
3160 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3161 }
3162 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3163 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3164 }
3165 #endif
3166
3167 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3168 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3169 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3170
3171 return JNI_OK;
3172 }
3173
3174 // Helper class for controlling the lifetime of JavaVMInitArgs
3175 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3176 // deleted on the destruction of the ScopedVMInitArgs object.
3177 class ScopedVMInitArgs : public StackObj {
3178 private:
3179 JavaVMInitArgs _args;
3180 char* _container_name;
3181 bool _is_set;
3182 char* _vm_options_file_arg;
3183
3184 public:
3185 ScopedVMInitArgs(const char *container_name) {
3186 _args.version = JNI_VERSION_1_2;
3187 _args.nOptions = 0;
3188 _args.options = NULL;
3189 _args.ignoreUnrecognized = false;
3190 _container_name = (char *)container_name;
3191 _is_set = false;
3192 _vm_options_file_arg = NULL;
3193 }
3194
3195 // Populates the JavaVMInitArgs object represented by this
3196 // ScopedVMInitArgs object with the arguments in options. The
3197 // allocated memory is deleted by the destructor. If this method
3198 // returns anything other than JNI_OK, then this object is in a
3199 // partially constructed state, and should be abandoned.
3200 jint set_args(GrowableArray<JavaVMOption>* options) {
3201 _is_set = true;
3202 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3203 JavaVMOption, options->length(), mtArguments);
3204 if (options_arr == NULL) {
3205 return JNI_ENOMEM;
3206 }
3207 _args.options = options_arr;
3208
3209 for (int i = 0; i < options->length(); i++) {
3210 options_arr[i] = options->at(i);
3211 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3212 if (options_arr[i].optionString == NULL) {
3213 // Rely on the destructor to do cleanup.
3214 _args.nOptions = i;
3215 return JNI_ENOMEM;
3216 }
3217 }
3218
3219 _args.nOptions = options->length();
3220 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3221 return JNI_OK;
3222 }
3223
3224 JavaVMInitArgs* get() { return &_args; }
3225 char* container_name() { return _container_name; }
3226 bool is_set() { return _is_set; }
3227 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3228 char* vm_options_file_arg() { return _vm_options_file_arg; }
3229
3230 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3231 if (_vm_options_file_arg != NULL) {
3232 os::free(_vm_options_file_arg);
3233 }
3234 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3235 }
3236
3237 ~ScopedVMInitArgs() {
3238 if (_vm_options_file_arg != NULL) {
3239 os::free(_vm_options_file_arg);
3240 }
3241 if (_args.options == NULL) return;
3242 for (int i = 0; i < _args.nOptions; i++) {
3243 os::free(_args.options[i].optionString);
3244 }
3245 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3246 }
3247
3248 // Insert options into this option list, to replace option at
3249 // vm_options_file_pos (-XX:VMOptionsFile)
3250 jint insert(const JavaVMInitArgs* args,
3251 const JavaVMInitArgs* args_to_insert,
3252 const int vm_options_file_pos) {
3253 assert(_args.options == NULL, "shouldn't be set yet");
3254 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3255 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3256
3257 int length = args->nOptions + args_to_insert->nOptions - 1;
3258 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3259 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3260 for (int i = 0; i < args->nOptions; i++) {
3261 if (i == vm_options_file_pos) {
3262 // insert the new options starting at the same place as the
3263 // -XX:VMOptionsFile option
3264 for (int j = 0; j < args_to_insert->nOptions; j++) {
3265 options->push(args_to_insert->options[j]);
3266 }
3267 } else {
3268 options->push(args->options[i]);
3269 }
3270 }
3271 // make into options array
3272 jint result = set_args(options);
3273 delete options;
3274 return result;
3275 }
3276 };
3277
3278 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3279 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3280 }
3281
3282 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3283 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3284 }
3285
3286 jint Arguments::parse_options_environment_variable(const char* name,
3287 ScopedVMInitArgs* vm_args) {
3288 char *buffer = ::getenv(name);
3289
3290 // Don't check this environment variable if user has special privileges
3291 // (e.g. unix su command).
3292 if (buffer == NULL || os::have_special_privileges()) {
3293 return JNI_OK;
3294 }
3295
3296 if ((buffer = os::strdup(buffer)) == NULL) {
3297 return JNI_ENOMEM;
3298 }
3299
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Picked up %s: %s\n", name, buffer);
3302
3303 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3304
3305 os::free(buffer);
3306 return retcode;
3307 }
3308
3309 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3310 // read file into buffer
3311 int fd = ::open(file_name, O_RDONLY);
3312 if (fd < 0) {
3313 jio_fprintf(defaultStream::error_stream(),
3314 "Could not open options file '%s'\n",
3315 file_name);
3316 return JNI_ERR;
3317 }
3318
3319 struct stat stbuf;
3320 int retcode = os::stat(file_name, &stbuf);
3321 if (retcode != 0) {
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Could not stat options file '%s'\n",
3324 file_name);
3325 os::close(fd);
3326 return JNI_ERR;
3327 }
3328
3329 if (stbuf.st_size == 0) {
3330 // tell caller there is no option data and that is ok
3331 os::close(fd);
3332 return JNI_OK;
3333 }
3334
3335 // '+ 1' for NULL termination even with max bytes
3336 size_t bytes_alloc = stbuf.st_size + 1;
3337
3338 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3339 if (NULL == buf) {
3340 jio_fprintf(defaultStream::error_stream(),
3341 "Could not allocate read buffer for options file parse\n");
3342 os::close(fd);
3343 return JNI_ENOMEM;
3344 }
3345
3346 memset(buf, 0, bytes_alloc);
3347
3348 // Fill buffer
3349 // Use ::read() instead of os::read because os::read()
3350 // might do a thread state transition
3351 // and it is too early for that here
3352
3353 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3354 os::close(fd);
3355 if (bytes_read < 0) {
3356 FREE_C_HEAP_ARRAY(char, buf);
3357 jio_fprintf(defaultStream::error_stream(),
3358 "Could not read options file '%s'\n", file_name);
3359 return JNI_ERR;
3360 }
3361
3362 if (bytes_read == 0) {
3363 // tell caller there is no option data and that is ok
3364 FREE_C_HEAP_ARRAY(char, buf);
3365 return JNI_OK;
3366 }
3367
3368 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3369
3370 FREE_C_HEAP_ARRAY(char, buf);
3371 return retcode;
3372 }
3373
3374 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3375 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3376
3377 // some pointers to help with parsing
3378 char *buffer_end = buffer + buf_len;
3379 char *opt_hd = buffer;
3380 char *wrt = buffer;
3381 char *rd = buffer;
3382
3383 // parse all options
3384 while (rd < buffer_end) {
3385 // skip leading white space from the input string
3386 while (rd < buffer_end && isspace(*rd)) {
3387 rd++;
3388 }
3389
3390 if (rd >= buffer_end) {
3391 break;
3392 }
3393
3394 // Remember this is where we found the head of the token.
3395 opt_hd = wrt;
3396
3397 // Tokens are strings of non white space characters separated
3398 // by one or more white spaces.
3399 while (rd < buffer_end && !isspace(*rd)) {
3400 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3401 int quote = *rd; // matching quote to look for
3402 rd++; // don't copy open quote
3403 while (rd < buffer_end && *rd != quote) {
3404 // include everything (even spaces)
3405 // up until the close quote
3406 *wrt++ = *rd++; // copy to option string
3407 }
3408
3409 if (rd < buffer_end) {
3410 rd++; // don't copy close quote
3411 } else {
3412 // did not see closing quote
3413 jio_fprintf(defaultStream::error_stream(),
3414 "Unmatched quote in %s\n", name);
3415 delete options;
3416 return JNI_ERR;
3417 }
3418 } else {
3419 *wrt++ = *rd++; // copy to option string
3420 }
3421 }
3422
3423 // steal a white space character and set it to NULL
3424 *wrt++ = '\0';
3425 // We now have a complete token
3426
3427 JavaVMOption option;
3428 option.optionString = opt_hd;
3429 option.extraInfo = NULL;
3430
3431 options->append(option); // Fill in option
3432
3433 rd++; // Advance to next character
3434 }
3435
3436 // Fill out JavaVMInitArgs structure.
3437 jint status = vm_args->set_args(options);
3438
3439 delete options;
3440 return status;
3441 }
3442
3443 void Arguments::set_shared_spaces_flags() {
3444 if (DumpSharedSpaces) {
3445 if (FailOverToOldVerifier) {
3446 // Don't fall back to the old verifier on verification failure. If a
3447 // class fails verification with the split verifier, it might fail the
3448 // CDS runtime verifier constraint check. In that case, we don't want
3449 // to share the class. We only archive classes that pass the split verifier.
3450 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3451 }
3452
3453 if (RequireSharedSpaces) {
3454 warning("Cannot dump shared archive while using shared archive");
3455 }
3456 UseSharedSpaces = false;
3457 #ifdef _LP64
3458 if (!UseCompressedOops || !UseCompressedClassPointers) {
3459 vm_exit_during_initialization(
3460 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3461 }
3462 } else {
3463 if (!UseCompressedOops || !UseCompressedClassPointers) {
3464 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3465 }
3466 #endif
3467 }
3468 }
3469
3470 // Sharing support
3471 // Construct the path to the archive
3472 static char* get_shared_archive_path() {
3473 char *shared_archive_path;
3474 if (SharedArchiveFile == NULL) {
3475 char jvm_path[JVM_MAXPATHLEN];
3476 os::jvm_path(jvm_path, sizeof(jvm_path));
3477 char *end = strrchr(jvm_path, *os::file_separator());
3478 if (end != NULL) *end = '\0';
3479 size_t jvm_path_len = strlen(jvm_path);
3480 size_t file_sep_len = strlen(os::file_separator());
3481 const size_t len = jvm_path_len + file_sep_len + 20;
3482 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3483 if (shared_archive_path != NULL) {
3484 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3485 jvm_path, os::file_separator());
3486 }
3487 } else {
3488 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3489 }
3490 return shared_archive_path;
3491 }
3492
3493 #ifndef PRODUCT
3494 // Determine whether LogVMOutput should be implicitly turned on.
3495 static bool use_vm_log() {
3496 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3497 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3498 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3499 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3500 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3501 return true;
3502 }
3503
3504 #ifdef COMPILER1
3505 if (PrintC1Statistics) {
3506 return true;
3507 }
3508 #endif // COMPILER1
3509
3510 #ifdef COMPILER2
3511 if (PrintOptoAssembly || PrintOptoStatistics) {
3512 return true;
3513 }
3514 #endif // COMPILER2
3515
3516 return false;
3517 }
3518
3519 #endif // PRODUCT
3520
3521 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3522 for (int index = 0; index < args->nOptions; index++) {
3523 const JavaVMOption* option = args->options + index;
3524 const char* tail;
3525 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3526 return true;
3527 }
3528 }
3529 return false;
3530 }
3531
3532 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3533 const char* vm_options_file,
3534 const int vm_options_file_pos,
3535 ScopedVMInitArgs* vm_options_file_args,
3536 ScopedVMInitArgs* args_out) {
3537 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3538 if (code != JNI_OK) {
3539 return code;
3540 }
3541
3542 if (vm_options_file_args->get()->nOptions < 1) {
3543 return JNI_OK;
3544 }
3545
3546 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3547 jio_fprintf(defaultStream::error_stream(),
3548 "A VM options file may not refer to a VM options file. "
3549 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3550 "options file '%s' in options container '%s' is an error.\n",
3551 vm_options_file_args->vm_options_file_arg(),
3552 vm_options_file_args->container_name());
3553 return JNI_EINVAL;
3554 }
3555
3556 return args_out->insert(args, vm_options_file_args->get(),
3557 vm_options_file_pos);
3558 }
3559
3560 // Expand -XX:VMOptionsFile found in args_in as needed.
3561 // mod_args and args_out parameters may return values as needed.
3562 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3563 ScopedVMInitArgs* mod_args,
3564 JavaVMInitArgs** args_out) {
3565 jint code = match_special_option_and_act(args_in, mod_args);
3566 if (code != JNI_OK) {
3567 return code;
3568 }
3569
3570 if (mod_args->is_set()) {
3571 // args_in contains -XX:VMOptionsFile and mod_args contains the
3572 // original options from args_in along with the options expanded
3573 // from the VMOptionsFile. Return a short-hand to the caller.
3574 *args_out = mod_args->get();
3575 } else {
3576 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3577 }
3578 return JNI_OK;
3579 }
3580
3581 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3582 ScopedVMInitArgs* args_out) {
3583 // Remaining part of option string
3584 const char* tail;
3585 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3586
3587 for (int index = 0; index < args->nOptions; index++) {
3588 const JavaVMOption* option = args->options + index;
3589 if (ArgumentsExt::process_options(option)) {
3590 continue;
3591 }
3592 if (match_option(option, "-XX:Flags=", &tail)) {
3593 Arguments::set_jvm_flags_file(tail);
3594 continue;
3595 }
3596 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3597 if (vm_options_file_args.found_vm_options_file_arg()) {
3598 jio_fprintf(defaultStream::error_stream(),
3599 "The option '%s' is already specified in the options "
3600 "container '%s' so the specification of '%s' in the "
3601 "same options container is an error.\n",
3602 vm_options_file_args.vm_options_file_arg(),
3603 vm_options_file_args.container_name(),
3604 option->optionString);
3605 return JNI_EINVAL;
3606 }
3607 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3608 // If there's a VMOptionsFile, parse that
3609 jint code = insert_vm_options_file(args, tail, index,
3610 &vm_options_file_args, args_out);
3611 if (code != JNI_OK) {
3612 return code;
3613 }
3614 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3615 if (args_out->is_set()) {
3616 // The VMOptions file inserted some options so switch 'args'
3617 // to the new set of options, and continue processing which
3618 // preserves "last option wins" semantics.
3619 args = args_out->get();
3620 // The first option from the VMOptionsFile replaces the
3621 // current option. So we back track to process the
3622 // replacement option.
3623 index--;
3624 }
3625 continue;
3626 }
3627 if (match_option(option, "-XX:+PrintVMOptions")) {
3628 PrintVMOptions = true;
3629 continue;
3630 }
3631 if (match_option(option, "-XX:-PrintVMOptions")) {
3632 PrintVMOptions = false;
3633 continue;
3634 }
3635 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3636 IgnoreUnrecognizedVMOptions = true;
3637 continue;
3638 }
3639 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3640 IgnoreUnrecognizedVMOptions = false;
3641 continue;
3642 }
3643 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3644 JVMFlag::printFlags(tty, false);
3645 vm_exit(0);
3646 }
3647 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3648 #if INCLUDE_NMT
3649 // The launcher did not setup nmt environment variable properly.
3650 if (!MemTracker::check_launcher_nmt_support(tail)) {
3651 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3652 }
3653
3654 // Verify if nmt option is valid.
3655 if (MemTracker::verify_nmt_option()) {
3656 // Late initialization, still in single-threaded mode.
3657 if (MemTracker::tracking_level() >= NMT_summary) {
3658 MemTracker::init();
3659 }
3660 } else {
3661 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3662 }
3663 continue;
3664 #else
3665 jio_fprintf(defaultStream::error_stream(),
3666 "Native Memory Tracking is not supported in this VM\n");
3667 return JNI_ERR;
3668 #endif
3669 }
3670
3671 #ifndef PRODUCT
3672 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3673 JVMFlag::printFlags(tty, true);
3674 vm_exit(0);
3675 }
3676 #endif
3677 }
3678 return JNI_OK;
3679 }
3680
3681 static void print_options(const JavaVMInitArgs *args) {
3682 const char* tail;
3683 for (int index = 0; index < args->nOptions; index++) {
3684 const JavaVMOption *option = args->options + index;
3685 if (match_option(option, "-XX:", &tail)) {
3686 logOption(tail);
3687 }
3688 }
3689 }
3690
3691 bool Arguments::handle_deprecated_print_gc_flags() {
3692 if (PrintGC) {
3693 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3694 }
3695 if (PrintGCDetails) {
3696 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3697 }
3698
3699 if (_gc_log_filename != NULL) {
3700 // -Xloggc was used to specify a filename
3701 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3702
3703 LogTarget(Error, logging) target;
3704 LogStream errstream(target);
3705 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3706 } else if (PrintGC || PrintGCDetails) {
3707 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3708 }
3709 return true;
3710 }
3711
3712 void Arguments::handle_extra_cms_flags(const char* msg) {
3713 SpecialFlag flag;
3714 const char *flag_name = "UseConcMarkSweepGC";
3715 if (lookup_special_flag(flag_name, flag)) {
3716 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3717 warning("%s", msg);
3718 }
3719 }
3720
3721 // Parse entry point called from JNI_CreateJavaVM
3722
3723 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3724 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3725
3726 // Initialize ranges, constraints and writeables
3727 JVMFlagRangeList::init();
3728 JVMFlagConstraintList::init();
3729 JVMFlagWriteableList::init();
3730
3731 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3732 const char* hotspotrc = ".hotspotrc";
3733 bool settings_file_specified = false;
3734 bool needs_hotspotrc_warning = false;
3735 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3736 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3737
3738 // Pointers to current working set of containers
3739 JavaVMInitArgs* cur_cmd_args;
3740 JavaVMInitArgs* cur_java_options_args;
3741 JavaVMInitArgs* cur_java_tool_options_args;
3742
3743 // Containers for modified/expanded options
3744 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3745 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3746 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3747
3748
3749 jint code =
3750 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3751 if (code != JNI_OK) {
3752 return code;
3753 }
3754
3755 code = parse_java_options_environment_variable(&initial_java_options_args);
3756 if (code != JNI_OK) {
3757 return code;
3758 }
3759
3760 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3761 &mod_java_tool_options_args,
3762 &cur_java_tool_options_args);
3763 if (code != JNI_OK) {
3764 return code;
3765 }
3766
3767 code = expand_vm_options_as_needed(initial_cmd_args,
3768 &mod_cmd_args,
3769 &cur_cmd_args);
3770 if (code != JNI_OK) {
3771 return code;
3772 }
3773
3774 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3775 &mod_java_options_args,
3776 &cur_java_options_args);
3777 if (code != JNI_OK) {
3778 return code;
3779 }
3780
3781 const char* flags_file = Arguments::get_jvm_flags_file();
3782 settings_file_specified = (flags_file != NULL);
3783
3784 if (IgnoreUnrecognizedVMOptions) {
3785 cur_cmd_args->ignoreUnrecognized = true;
3786 cur_java_tool_options_args->ignoreUnrecognized = true;
3787 cur_java_options_args->ignoreUnrecognized = true;
3788 }
3789
3790 // Parse specified settings file
3791 if (settings_file_specified) {
3792 if (!process_settings_file(flags_file, true,
3793 cur_cmd_args->ignoreUnrecognized)) {
3794 return JNI_EINVAL;
3795 }
3796 } else {
3797 #ifdef ASSERT
3798 // Parse default .hotspotrc settings file
3799 if (!process_settings_file(".hotspotrc", false,
3800 cur_cmd_args->ignoreUnrecognized)) {
3801 return JNI_EINVAL;
3802 }
3803 #else
3804 struct stat buf;
3805 if (os::stat(hotspotrc, &buf) == 0) {
3806 needs_hotspotrc_warning = true;
3807 }
3808 #endif
3809 }
3810
3811 if (PrintVMOptions) {
3812 print_options(cur_java_tool_options_args);
3813 print_options(cur_cmd_args);
3814 print_options(cur_java_options_args);
3815 }
3816
3817 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3818 jint result = parse_vm_init_args(cur_java_tool_options_args,
3819 cur_java_options_args,
3820 cur_cmd_args);
3821
3822 if (result != JNI_OK) {
3823 return result;
3824 }
3825
3826 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3827 SharedArchivePath = get_shared_archive_path();
3828 if (SharedArchivePath == NULL) {
3829 return JNI_ENOMEM;
3830 }
3831
3832 // Set up VerifySharedSpaces
3833 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3834 VerifySharedSpaces = true;
3835 }
3836
3837 // Delay warning until here so that we've had a chance to process
3838 // the -XX:-PrintWarnings flag
3839 if (needs_hotspotrc_warning) {
3840 warning("%s file is present but has been ignored. "
3841 "Run with -XX:Flags=%s to load the file.",
3842 hotspotrc, hotspotrc);
3843 }
3844
3845 if (needs_module_property_warning) {
3846 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3847 " names that are reserved for internal use.");
3848 }
3849
3850 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3851 UNSUPPORTED_OPTION(UseLargePages);
3852 #endif
3853
3854 ArgumentsExt::report_unsupported_options();
3855
3856 #ifndef PRODUCT
3857 if (TraceBytecodesAt != 0) {
3858 TraceBytecodes = true;
3859 }
3860 if (CountCompiledCalls) {
3861 if (UseCounterDecay) {
3862 warning("UseCounterDecay disabled because CountCalls is set");
3863 UseCounterDecay = false;
3864 }
3865 }
3866 #endif // PRODUCT
3867
3868 if (ScavengeRootsInCode == 0) {
3869 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3870 warning("Forcing ScavengeRootsInCode non-zero");
3871 }
3872 ScavengeRootsInCode = 1;
3873 }
3874
3875 if (!handle_deprecated_print_gc_flags()) {
3876 return JNI_EINVAL;
3877 }
3878
3879 // Set object alignment values.
3880 set_object_alignment();
3881
3882 #if !INCLUDE_CDS
3883 if (DumpSharedSpaces || RequireSharedSpaces) {
3884 jio_fprintf(defaultStream::error_stream(),
3885 "Shared spaces are not supported in this VM\n");
3886 return JNI_ERR;
3887 }
3888 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3889 log_is_enabled(Info, cds)) {
3890 warning("Shared spaces are not supported in this VM");
3891 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3892 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3893 }
3894 no_shared_spaces("CDS Disabled");
3895 #endif // INCLUDE_CDS
3896
3897 return JNI_OK;
3898 }
3899
3900 jint Arguments::apply_ergo() {
3901 // Set flags based on ergonomics.
3902 jint result = set_ergonomics_flags();
3903 if (result != JNI_OK) return result;
3904
3905 // Set heap size based on available physical memory
3906 set_heap_size();
3907
3908 GCConfig::arguments()->initialize();
3909
3910 set_shared_spaces_flags();
3911
3912 // Initialize Metaspace flags and alignments
3913 Metaspace::ergo_initialize();
3914
3915 // Set compiler flags after GC is selected and GC specific
3916 // flags (LoopStripMiningIter) are set.
3917 CompilerConfig::ergo_initialize();
3918
3919 // Set bytecode rewriting flags
3920 set_bytecode_flags();
3921
3922 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3923 jint code = set_aggressive_opts_flags();
3924 if (code != JNI_OK) {
3925 return code;
3926 }
3927
3928 // Turn off biased locking for locking debug mode flags,
3929 // which are subtly different from each other but neither works with
3930 // biased locking
3931 if (UseHeavyMonitors
3932 #ifdef COMPILER1
3933 || !UseFastLocking
3934 #endif // COMPILER1
3935 #if INCLUDE_JVMCI
3936 || !JVMCIUseFastLocking
3937 #endif
3938 ) {
3939 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3940 // flag set to true on command line; warn the user that they
3941 // can't enable biased locking here
3942 warning("Biased Locking is not supported with locking debug flags"
3943 "; ignoring UseBiasedLocking flag." );
3944 }
3945 UseBiasedLocking = false;
3946 }
3947
3948 #ifdef CC_INTERP
3949 // Clear flags not supported on zero.
3950 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3951 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3952 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3953 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3954 #endif // CC_INTERP
3955
3956 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3957 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3958 DebugNonSafepoints = true;
3959 }
3960
3961 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3962 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3963 }
3964
3965 #ifndef PRODUCT
3966 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3967 if (use_vm_log()) {
3968 LogVMOutput = true;
3969 }
3970 }
3971 #endif // PRODUCT
3972
3973 if (PrintCommandLineFlags) {
3974 JVMFlag::printSetFlags(tty);
3975 }
3976
3977 // Apply CPU specific policy for the BiasedLocking
3978 if (UseBiasedLocking) {
3979 if (!VM_Version::use_biased_locking() &&
3980 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3981 UseBiasedLocking = false;
3982 }
3983 }
3984 #ifdef COMPILER2
3985 if (!UseBiasedLocking) {
3986 UseOptoBiasInlining = false;
3987 }
3988 #endif
3989
3990 #if defined(IA32)
3991 // Only server compiler can optimize safepoints well enough.
3992 if (!is_server_compilation_mode_vm()) {
3993 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
3994 }
3995 #endif
3996
3997 // ThreadLocalHandshakesConstraintFunc handles the constraints.
3998 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
3999 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4000 } else {
4001 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4002 }
4003
4004 return JNI_OK;
4005 }
4006
4007 jint Arguments::adjust_after_os() {
4008 if (UseNUMA) {
4009 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4010 FLAG_SET_ERGO(bool, UseNUMA, false);
4011 } else if (UseParallelGC || UseParallelOldGC) {
4012 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4013 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4014 }
4015 }
4016 // UseNUMAInterleaving is set to ON for all collectors and
4017 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4018 // such as the parallel collector for Linux and Solaris will
4019 // interleave old gen and survivor spaces on top of NUMA
4020 // allocation policy for the eden space.
4021 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4022 // all platforms and ParallelGC on Windows will interleave all
4023 // of the heap spaces across NUMA nodes.
4024 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4025 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4026 }
4027 }
4028 return JNI_OK;
4029 }
4030
4031 int Arguments::PropertyList_count(SystemProperty* pl) {
4032 int count = 0;
4033 while(pl != NULL) {
4034 count++;
4035 pl = pl->next();
4036 }
4037 return count;
4038 }
4039
4040 // Return the number of readable properties.
4041 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4042 int count = 0;
4043 while(pl != NULL) {
4044 if (pl->is_readable()) {
4045 count++;
4046 }
4047 pl = pl->next();
4048 }
4049 return count;
4050 }
4051
4052 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4053 assert(key != NULL, "just checking");
4054 SystemProperty* prop;
4055 for (prop = pl; prop != NULL; prop = prop->next()) {
4056 if (strcmp(key, prop->key()) == 0) return prop->value();
4057 }
4058 return NULL;
4059 }
4060
4061 // Return the value of the requested property provided that it is a readable property.
4062 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4063 assert(key != NULL, "just checking");
4064 SystemProperty* prop;
4065 // Return the property value if the keys match and the property is not internal or
4066 // it's the special internal property "jdk.boot.class.path.append".
4067 for (prop = pl; prop != NULL; prop = prop->next()) {
4068 if (strcmp(key, prop->key()) == 0) {
4069 if (!prop->internal()) {
4070 return prop->value();
4071 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4072 return prop->value();
4073 } else {
4074 // Property is internal and not jdk.boot.class.path.append so return NULL.
4075 return NULL;
4076 }
4077 }
4078 }
4079 return NULL;
4080 }
4081
4082 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4083 int count = 0;
4084 const char* ret_val = NULL;
4085
4086 while(pl != NULL) {
4087 if(count >= index) {
4088 ret_val = pl->key();
4089 break;
4090 }
4091 count++;
4092 pl = pl->next();
4093 }
4094
4095 return ret_val;
4096 }
4097
4098 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4099 int count = 0;
4100 char* ret_val = NULL;
4101
4102 while(pl != NULL) {
4103 if(count >= index) {
4104 ret_val = pl->value();
4105 break;
4106 }
4107 count++;
4108 pl = pl->next();
4109 }
4110
4111 return ret_val;
4112 }
4113
4114 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4115 SystemProperty* p = *plist;
4116 if (p == NULL) {
4117 *plist = new_p;
4118 } else {
4119 while (p->next() != NULL) {
4120 p = p->next();
4121 }
4122 p->set_next(new_p);
4123 }
4124 }
4125
4126 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4127 bool writeable, bool internal) {
4128 if (plist == NULL)
4129 return;
4130
4131 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4132 PropertyList_add(plist, new_p);
4133 }
4134
4135 void Arguments::PropertyList_add(SystemProperty *element) {
4136 PropertyList_add(&_system_properties, element);
4137 }
4138
4139 // This add maintains unique property key in the list.
4140 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4141 PropertyAppendable append, PropertyWriteable writeable,
4142 PropertyInternal internal) {
4143 if (plist == NULL)
4144 return;
4145
4146 // If property key exist then update with new value.
4147 SystemProperty* prop;
4148 for (prop = *plist; prop != NULL; prop = prop->next()) {
4149 if (strcmp(k, prop->key()) == 0) {
4150 if (append == AppendProperty) {
4151 prop->append_value(v);
4152 } else {
4153 prop->set_value(v);
4154 }
4155 return;
4156 }
4157 }
4158
4159 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4160 }
4161
4162 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4163 // Returns true if all of the source pointed by src has been copied over to
4164 // the destination buffer pointed by buf. Otherwise, returns false.
4165 // Notes:
4166 // 1. If the length (buflen) of the destination buffer excluding the
4167 // NULL terminator character is not long enough for holding the expanded
4168 // pid characters, it also returns false instead of returning the partially
4169 // expanded one.
4170 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4171 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4172 char* buf, size_t buflen) {
4173 const char* p = src;
4174 char* b = buf;
4175 const char* src_end = &src[srclen];
4176 char* buf_end = &buf[buflen - 1];
4177
4178 while (p < src_end && b < buf_end) {
4179 if (*p == '%') {
4180 switch (*(++p)) {
4181 case '%': // "%%" ==> "%"
4182 *b++ = *p++;
4183 break;
4184 case 'p': { // "%p" ==> current process id
4185 // buf_end points to the character before the last character so
4186 // that we could write '\0' to the end of the buffer.
4187 size_t buf_sz = buf_end - b + 1;
4188 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4189
4190 // if jio_snprintf fails or the buffer is not long enough to hold
4191 // the expanded pid, returns false.
4192 if (ret < 0 || ret >= (int)buf_sz) {
4193 return false;
4194 } else {
4195 b += ret;
4196 assert(*b == '\0', "fail in copy_expand_pid");
4197 if (p == src_end && b == buf_end + 1) {
4198 // reach the end of the buffer.
4199 return true;
4200 }
4201 }
4202 p++;
4203 break;
4204 }
4205 default :
4206 *b++ = '%';
4207 }
4208 } else {
4209 *b++ = *p++;
4210 }
4211 }
4212 *b = '\0';
4213 return (p == src_end); // return false if not all of the source was copied
4214 }