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 "jfr/recorder/access/jfrOptionSet.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/universe.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.inline.hpp"
53 #include "runtime/safepoint.hpp"
54 #include "runtime/safepointMechanism.hpp"
55 #include "runtime/vm_version.hpp"
56 #include "services/management.hpp"
57 #include "services/memTracker.hpp"
58 #include "utilities/align.hpp"
59 #include "utilities/defaultStream.hpp"
60 #include "utilities/macros.hpp"
61 #include "utilities/stringUtils.hpp"
62 #if INCLUDE_JVMCI
63 #include "jvmci/jvmciRuntime.hpp"
64 #endif
65
66 // Note: This is a special bug reporting site for the JVM
67 #ifdef VENDOR_URL_VM_BUG
68 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
69 #else
70 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
71 #endif
72 #define DEFAULT_JAVA_LAUNCHER "generic"
73
74 char* Arguments::_jvm_flags_file = NULL;
75 char** Arguments::_jvm_flags_array = NULL;
76 int Arguments::_num_jvm_flags = 0;
77 char** Arguments::_jvm_args_array = NULL;
78 int Arguments::_num_jvm_args = 0;
79 char* Arguments::_java_command = NULL;
80 SystemProperty* Arguments::_system_properties = NULL;
81 const char* Arguments::_gc_log_filename = NULL;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 int Arguments::_sun_java_launcher_pid = -1;
90 bool Arguments::_sun_java_launcher_is_altjvm = false;
91
92 // These parameters are reset in method parse_vm_init_args()
93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
95 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
96 bool Arguments::_ClipInlining = ClipInlining;
97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
99
100 char* Arguments::SharedArchivePath = NULL;
101
102 AgentLibraryList Arguments::_libraryList;
103 AgentLibraryList Arguments::_agentList;
104
105 abort_hook_t Arguments::_abort_hook = NULL;
106 exit_hook_t Arguments::_exit_hook = NULL;
107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
108
109
110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
111 SystemProperty *Arguments::_java_library_path = NULL;
112 SystemProperty *Arguments::_java_home = NULL;
113 SystemProperty *Arguments::_java_class_path = NULL;
114 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
115
116 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
117 PathString *Arguments::_system_boot_class_path = NULL;
118 bool Arguments::_has_jimage = false;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 bool PathString::set_value(const char *value) {
123 if (_value != NULL) {
124 FreeHeap(_value);
125 }
126 _value = AllocateHeap(strlen(value)+1, mtArguments);
127 assert(_value != NULL, "Unable to allocate space for new path value");
128 if (_value != NULL) {
129 strcpy(_value, value);
130 } else {
131 // not able to allocate
132 return false;
133 }
134 return true;
135 }
136
137 void PathString::append_value(const char *value) {
138 char *sp;
139 size_t len = 0;
140 if (value != NULL) {
141 len = strlen(value);
142 if (_value != NULL) {
143 len += strlen(_value);
144 }
145 sp = AllocateHeap(len+2, mtArguments);
146 assert(sp != NULL, "Unable to allocate space for new append path value");
147 if (sp != NULL) {
148 if (_value != NULL) {
149 strcpy(sp, _value);
150 strcat(sp, os::path_separator());
151 strcat(sp, value);
152 FreeHeap(_value);
153 } else {
154 strcpy(sp, value);
155 }
156 _value = sp;
157 }
158 }
159 }
160
161 PathString::PathString(const char* value) {
162 if (value == NULL) {
163 _value = NULL;
164 } else {
165 _value = AllocateHeap(strlen(value)+1, mtArguments);
166 strcpy(_value, value);
167 }
168 }
169
170 PathString::~PathString() {
171 if (_value != NULL) {
172 FreeHeap(_value);
173 _value = NULL;
174 }
175 }
176
177 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
178 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
179 size_t len = strlen(module_name) + 1;
180 _module_name = AllocateHeap(len, mtInternal);
181 strncpy(_module_name, module_name, len); // copy the trailing null
182 _path = new PathString(path);
183 }
184
185 ModulePatchPath::~ModulePatchPath() {
186 if (_module_name != NULL) {
187 FreeHeap(_module_name);
188 _module_name = NULL;
189 }
190 if (_path != NULL) {
191 delete _path;
192 _path = NULL;
193 }
194 }
195
196 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
197 if (key == NULL) {
198 _key = NULL;
199 } else {
200 _key = AllocateHeap(strlen(key)+1, mtArguments);
201 strcpy(_key, key);
202 }
203 _next = NULL;
204 _internal = internal;
205 _writeable = writeable;
206 }
207
208 AgentLibrary::AgentLibrary(const char* name, const char* options,
209 bool is_absolute_path, void* os_lib,
210 bool instrument_lib) {
211 _name = AllocateHeap(strlen(name)+1, mtArguments);
212 strcpy(_name, name);
213 if (options == NULL) {
214 _options = NULL;
215 } else {
216 _options = AllocateHeap(strlen(options)+1, mtArguments);
217 strcpy(_options, options);
218 }
219 _is_absolute_path = is_absolute_path;
220 _os_lib = os_lib;
221 _next = NULL;
222 _state = agent_invalid;
223 _is_static_lib = false;
224 _is_instrument_lib = instrument_lib;
225 }
226
227 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
228 // part of the option string.
229 static bool match_option(const JavaVMOption *option, const char* name,
230 const char** tail) {
231 size_t len = strlen(name);
232 if (strncmp(option->optionString, name, len) == 0) {
233 *tail = option->optionString + len;
234 return true;
235 } else {
236 return false;
237 }
238 }
239
240 // Check if 'option' matches 'name'. No "tail" is allowed.
241 static bool match_option(const JavaVMOption *option, const char* name) {
242 const char* tail = NULL;
243 bool result = match_option(option, name, &tail);
244 if (tail != NULL && *tail == '\0') {
245 return result;
246 } else {
247 return false;
248 }
249 }
250
251 // Return true if any of the strings in null-terminated array 'names' matches.
252 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
253 // the option must match exactly.
254 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
255 bool tail_allowed) {
256 for (/* empty */; *names != NULL; ++names) {
257 if (match_option(option, *names, tail)) {
258 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
259 return true;
260 }
261 }
262 }
263 return false;
264 }
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != NULL, "invariant");
269 char* tail = NULL;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 return JfrOptionSet::parse_start_flight_recording(option, tail);
272 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
273 return JfrOptionSet::parse_flight_recorder_options(option, tail);
274 }
275 return false;
276 }
277
278 static void logOption(const char* opt) {
279 if (PrintVMOptions) {
280 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
281 }
282 }
283
284 bool needs_module_property_warning = false;
285
286 #define MODULE_PROPERTY_PREFIX "jdk.module."
287 #define MODULE_PROPERTY_PREFIX_LEN 11
288 #define ADDEXPORTS "addexports"
289 #define ADDEXPORTS_LEN 10
290 #define ADDREADS "addreads"
291 #define ADDREADS_LEN 8
292 #define ADDOPENS "addopens"
293 #define ADDOPENS_LEN 8
294 #define PATCH "patch"
295 #define PATCH_LEN 5
296 #define ADDMODS "addmods"
297 #define ADDMODS_LEN 7
298 #define LIMITMODS "limitmods"
299 #define LIMITMODS_LEN 9
300 #define PATH "path"
301 #define PATH_LEN 4
302 #define UPGRADE_PATH "upgrade.path"
303 #define UPGRADE_PATH_LEN 12
304
305 void Arguments::add_init_library(const char* name, char* options) {
306 _libraryList.add(new AgentLibrary(name, options, false, NULL));
307 }
308
309 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
310 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
311 }
312
313 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
314 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
315 }
316
317 // Late-binding agents not started via arguments
318 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
319 _agentList.add(agentLib);
320 }
321
322 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
323 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
324 }
325
326 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
327 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
328 return ((strncmp(option, property, len) == 0) &&
329 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
330 }
331
332 // Return true if property starts with "jdk.module." and its ensuing chars match
333 // any of the reserved module properties.
334 // property should be passed without the leading "-D".
335 bool Arguments::is_internal_module_property(const char* property) {
336 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
337 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
338 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
339 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
340 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
341 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
342 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
343 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
344 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
345 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
346 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
347 return true;
348 }
349 }
350 return false;
351 }
352
353 // Process java launcher properties.
354 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
355 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
356 // sun.java.launcher.pid is defined.
357 // Must do this before setting up other system properties,
358 // as some of them may depend on launcher type.
359 for (int index = 0; index < args->nOptions; index++) {
360 const JavaVMOption* option = args->options + index;
361 const char* tail;
362
363 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
364 process_java_launcher_argument(tail, option->extraInfo);
365 continue;
366 }
367 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
368 if (strcmp(tail, "true") == 0) {
369 _sun_java_launcher_is_altjvm = true;
370 }
371 continue;
372 }
373 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
374 _sun_java_launcher_pid = atoi(tail);
375 continue;
376 }
377 }
378 }
379
380 // Initialize system properties key and value.
381 void Arguments::init_system_properties() {
382
383 // Set up _system_boot_class_path which is not a property but
384 // relies heavily on argument processing and the jdk.boot.class.path.append
385 // property. It is used to store the underlying system boot class path.
386 _system_boot_class_path = new PathString(NULL);
387
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
389 "Java Virtual Machine Specification", false));
390 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
391 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
392 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
393 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to NULL and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
399 _java_library_path = new SystemProperty("java.library.path", NULL, true);
400 _java_home = new SystemProperty("java.home", NULL, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414
415 // Set OS specific system properties values
416 os::init_system_properties_values();
417 }
418
419 // Update/Initialize System properties after JDK version number is known
420 void Arguments::init_version_specific_system_properties() {
421 enum { bufsz = 16 };
422 char buffer[bufsz];
423 const char* spec_vendor = "Oracle Corporation";
424 uint32_t spec_version = JDK_Version::current().major_version();
425
426 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
427
428 PropertyList_add(&_system_properties,
429 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
430 PropertyList_add(&_system_properties,
431 new SystemProperty("java.vm.specification.version", buffer, false));
432 PropertyList_add(&_system_properties,
433 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
434 }
435
436 /*
437 * -XX argument processing:
438 *
439 * -XX arguments are defined in several places, such as:
440 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
441 * -XX arguments are parsed in parse_argument().
442 * -XX argument bounds checking is done in check_vm_args_consistency().
443 *
444 * Over time -XX arguments may change. There are mechanisms to handle common cases:
445 *
446 * ALIASED: An option that is simply another name for another option. This is often
447 * part of the process of deprecating a flag, but not all aliases need
448 * to be deprecated.
449 *
450 * Create an alias for an option by adding the old and new option names to the
451 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
452 *
453 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
454 * support may be removed in the future. Both regular and aliased options may be
455 * deprecated.
456 *
457 * Add a deprecation warning for an option (or alias) by adding an entry in the
458 * "special_jvm_flags" table and setting the "deprecated_in" field.
459 * Often an option "deprecated" in one major release will
460 * be made "obsolete" in the next. In this case the entry should also have its
461 * "obsolete_in" field set.
462 *
463 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
464 * on the command line. A warning is printed to let the user know that option might not
465 * be accepted in the future.
466 *
467 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
468 * table and setting the "obsolete_in" field.
469 *
470 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
471 * to the current JDK version. The system will flatly refuse to admit the existence of
472 * the flag. This allows a flag to die automatically over JDK releases.
473 *
474 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
475 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
476 * - Newly obsolete or expired deprecated options should have their global variable
477 * definitions removed (from globals.hpp, etc) and related implementations removed.
478 *
479 * Recommended approach for removing options:
480 *
481 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
482 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
483 *
484 * To remove internal options (e.g. diagnostic, experimental, develop options), use
485 * a 2-step model adding major release numbers to the obsolete and expire columns.
486 *
487 * To change the name of an option, use the alias table as well as a 2-step
488 * model adding major release numbers to the deprecate and expire columns.
489 * Think twice about aliasing commonly used customer options.
490 *
491 * There are times when it is appropriate to leave a future release number as undefined.
492 *
493 * Tests: Aliases should be tested in VMAliasOptions.java.
494 * Deprecated options should be tested in VMDeprecatedOptions.java.
495 */
496
497 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
498 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
499 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
500 // the command-line as usual, but will issue a warning.
501 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
502 // the command-line, while issuing a warning and ignoring the flag value.
503 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
504 // existence of the flag.
505 //
506 // MANUAL CLEANUP ON JDK VERSION UPDATES:
507 // This table ensures that the handling of options will update automatically when the JDK
508 // version is incremented, but the source code needs to be cleanup up manually:
509 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
510 // variable should be removed, as well as users of the variable.
511 // - As "deprecated" options age into "obsolete" options, move the entry into the
512 // "Obsolete Flags" section of the table.
513 // - All expired options should be removed from the table.
514 static SpecialFlag const special_jvm_flags[] = {
515 // -------------- Deprecated Flags --------------
516 // --- Non-alias flags - sorted by obsolete_in then expired_in:
517 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
518 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
520 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
521 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
523 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
527 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
528 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
529 { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
530 { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
531 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
532
533 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
534 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
537 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
538
539 // -------------- Obsolete Flags - sorted by expired_in --------------
540 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
541 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
542 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
543 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
544 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
545 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
546 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
547 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
548 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
549 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
550 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
551 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
552 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
553 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
554 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
555 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
556 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
557 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
558 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
559
560 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
561 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
562 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
563 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
564 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
565 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
566 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
567 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
568 #endif
569
570 { NULL, JDK_Version(0), JDK_Version(0) }
571 };
572
573 // Flags that are aliases for other flags.
574 typedef struct {
575 const char* alias_name;
576 const char* real_name;
577 } AliasedFlag;
578
579 static AliasedFlag const aliased_jvm_flags[] = {
580 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
581 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
582 { NULL, NULL}
583 };
584
585 // NOTE: A compatibility request will be necessary for each alias to be removed.
586 static AliasedLoggingFlag const aliased_logging_flags[] = {
587 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
588 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
589 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
590 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
591 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
592 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
593 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
594 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
595 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
596 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
597 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
598 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
599 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
600 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
601 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
602 };
603
604 #ifndef PRODUCT
605 // These options are removed in jdk9. Remove this code for jdk10.
606 static AliasedFlag const removed_develop_logging_flags[] = {
607 { "TraceClassInitialization", "-Xlog:class+init" },
608 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
609 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
610 { "TraceItables", "-Xlog:itables=debug" },
611 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
612 { "TraceSafepoint", "-Xlog:safepoint=debug" },
613 { "TraceStartupTime", "-Xlog:startuptime" },
614 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
615 { "PrintVtables", "-Xlog:vtables=debug" },
616 { "VerboseVerification", "-Xlog:verification" },
617 { NULL, NULL }
618 };
619 #endif //PRODUCT
620
621 // Return true if "v" is less than "other", where "other" may be "undefined".
622 static bool version_less_than(JDK_Version v, JDK_Version other) {
623 assert(!v.is_undefined(), "must be defined");
624 if (!other.is_undefined() && v.compare(other) >= 0) {
625 return false;
626 } else {
627 return true;
628 }
629 }
630
631 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
632
633 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
634 // Allow extensions to have priority
635 if (lookup_special_flag_ext(flag_name, flag)) {
636 return true;
637 }
638
639 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
640 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
641 flag = special_jvm_flags[i];
642 return true;
643 }
644 }
645 return false;
646 }
647
648 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
649 assert(version != NULL, "Must provide a version buffer");
650 SpecialFlag flag;
651 if (lookup_special_flag(flag_name, flag)) {
652 if (!flag.obsolete_in.is_undefined()) {
653 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
654 *version = flag.obsolete_in;
655 return true;
656 }
657 }
658 }
659 return false;
660 }
661
662 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
663 assert(version != NULL, "Must provide a version buffer");
664 SpecialFlag flag;
665 if (lookup_special_flag(flag_name, flag)) {
666 if (!flag.deprecated_in.is_undefined()) {
667 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
668 version_less_than(JDK_Version::current(), flag.expired_in)) {
669 *version = flag.deprecated_in;
670 return 1;
671 } else {
672 return -1;
673 }
674 }
675 }
676 return 0;
677 }
678
679 #ifndef PRODUCT
680 const char* Arguments::removed_develop_logging_flag_name(const char* name){
681 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
682 const AliasedFlag& flag = removed_develop_logging_flags[i];
683 if (strcmp(flag.alias_name, name) == 0) {
684 return flag.real_name;
685 }
686 }
687 return NULL;
688 }
689 #endif // PRODUCT
690
691 const char* Arguments::real_flag_name(const char *flag_name) {
692 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
693 const AliasedFlag& flag_status = aliased_jvm_flags[i];
694 if (strcmp(flag_status.alias_name, flag_name) == 0) {
695 return flag_status.real_name;
696 }
697 }
698 return flag_name;
699 }
700
701 #ifdef ASSERT
702 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
703 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
704 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
705 return true;
706 }
707 }
708 return false;
709 }
710
711 // Verifies the correctness of the entries in the special_jvm_flags table.
712 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
713 // version being earlier than the deprecation version, then a warning is issued
714 // and verification fails - by returning false. If it is detected that the table
715 // is out of date, with respect to the current version, then a warning is issued
716 // but verification does not fail. This allows the VM to operate when the version
717 // is first updated, without needing to update all the impacted flags at the
718 // same time.
719 static bool verify_special_jvm_flags() {
720 bool success = true;
721 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
722 const SpecialFlag& flag = special_jvm_flags[i];
723 if (lookup_special_flag(flag.name, i)) {
724 warning("Duplicate special flag declaration \"%s\"", flag.name);
725 success = false;
726 }
727 if (flag.deprecated_in.is_undefined() &&
728 flag.obsolete_in.is_undefined()) {
729 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
730 success = false;
731 }
732
733 if (!flag.deprecated_in.is_undefined()) {
734 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
735 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
736 success = false;
737 }
738
739 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
740 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
741 success = false;
742 }
743 }
744
745 if (!flag.obsolete_in.is_undefined()) {
746 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
747 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
748 success = false;
749 }
750
751 // if flag has become obsolete it should not have a "globals" flag defined anymore.
752 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
753 if (Flag::find_flag(flag.name) != NULL) {
754 // Temporarily disable the warning: 8196739
755 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
756 }
757 }
758 }
759
760 if (!flag.expired_in.is_undefined()) {
761 // if flag has become expired it should not have a "globals" flag defined anymore.
762 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
763 if (Flag::find_flag(flag.name) != NULL) {
764 // Temporarily disable the warning: 8196739
765 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
766 }
767 }
768 }
769
770 }
771 return success;
772 }
773 #endif
774
775 // Parses a size specification string.
776 bool Arguments::atojulong(const char *s, julong* result) {
777 julong n = 0;
778
779 // First char must be a digit. Don't allow negative numbers or leading spaces.
780 if (!isdigit(*s)) {
781 return false;
782 }
783
784 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
785 char* remainder;
786 errno = 0;
787 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
788 if (errno != 0) {
789 return false;
790 }
791
792 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
793 if (remainder == s || strlen(remainder) > 1) {
794 return false;
795 }
796
797 switch (*remainder) {
798 case 'T': case 't':
799 *result = n * G * K;
800 // Check for overflow.
801 if (*result/((julong)G * K) != n) return false;
802 return true;
803 case 'G': case 'g':
804 *result = n * G;
805 if (*result/G != n) return false;
806 return true;
807 case 'M': case 'm':
808 *result = n * M;
809 if (*result/M != n) return false;
810 return true;
811 case 'K': case 'k':
812 *result = n * K;
813 if (*result/K != n) return false;
814 return true;
815 case '\0':
816 *result = n;
817 return true;
818 default:
819 return false;
820 }
821 }
822
823 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
824 if (size < min_size) return arg_too_small;
825 if (size > max_size) return arg_too_big;
826 return arg_in_range;
827 }
828
829 // Describe an argument out of range error
830 void Arguments::describe_range_error(ArgsRange errcode) {
831 switch(errcode) {
832 case arg_too_big:
833 jio_fprintf(defaultStream::error_stream(),
834 "The specified size exceeds the maximum "
835 "representable size.\n");
836 break;
837 case arg_too_small:
838 case arg_unreadable:
839 case arg_in_range:
840 // do nothing for now
841 break;
842 default:
843 ShouldNotReachHere();
844 }
845 }
846
847 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
848 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
849 return true;
850 } else {
851 return false;
852 }
853 }
854
855 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
856 char* end;
857 errno = 0;
858 double v = strtod(value, &end);
859 if ((errno != 0) || (*end != 0)) {
860 return false;
861 }
862
863 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
864 return true;
865 }
866 return false;
867 }
868
869 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
870 julong v;
871 int int_v;
872 intx intx_v;
873 bool is_neg = false;
874 Flag* result = Flag::find_flag(name, strlen(name));
875
876 if (result == NULL) {
877 return false;
878 }
879
880 // Check the sign first since atojulong() parses only unsigned values.
881 if (*value == '-') {
882 if (!result->is_intx() && !result->is_int()) {
883 return false;
884 }
885 value++;
886 is_neg = true;
887 }
888 if (!Arguments::atojulong(value, &v)) {
889 return false;
890 }
891 if (result->is_int()) {
892 int_v = (int) v;
893 if (is_neg) {
894 int_v = -int_v;
895 }
896 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
897 } else if (result->is_uint()) {
898 uint uint_v = (uint) v;
899 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
900 } else if (result->is_intx()) {
901 intx_v = (intx) v;
902 if (is_neg) {
903 intx_v = -intx_v;
904 }
905 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
906 } else if (result->is_uintx()) {
907 uintx uintx_v = (uintx) v;
908 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
909 } else if (result->is_uint64_t()) {
910 uint64_t uint64_t_v = (uint64_t) v;
911 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
912 } else if (result->is_size_t()) {
913 size_t size_t_v = (size_t) v;
914 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
915 } else if (result->is_double()) {
916 double double_v = (double) v;
917 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
918 } else {
919 return false;
920 }
921 }
922
923 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
924 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
925 // Contract: CommandLineFlags always returns a pointer that needs freeing.
926 FREE_C_HEAP_ARRAY(char, value);
927 return true;
928 }
929
930 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
931 const char* old_value = "";
932 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
933 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
934 size_t new_len = strlen(new_value);
935 const char* value;
936 char* free_this_too = NULL;
937 if (old_len == 0) {
938 value = new_value;
939 } else if (new_len == 0) {
940 value = old_value;
941 } else {
942 size_t length = old_len + 1 + new_len + 1;
943 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
944 // each new setting adds another LINE to the switch:
945 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
946 value = buf;
947 free_this_too = buf;
948 }
949 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
950 // CommandLineFlags always returns a pointer that needs freeing.
951 FREE_C_HEAP_ARRAY(char, value);
952 if (free_this_too != NULL) {
953 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
954 FREE_C_HEAP_ARRAY(char, free_this_too);
955 }
956 return true;
957 }
958
959 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
960 const char* real_name = real_flag_name(arg);
961 JDK_Version since = JDK_Version();
962 switch (is_deprecated_flag(arg, &since)) {
963 case -1:
964 return NULL; // obsolete or expired, don't process normally
965 case 0:
966 return real_name;
967 case 1: {
968 if (warn) {
969 char version[256];
970 since.to_string(version, sizeof(version));
971 if (real_name != arg) {
972 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
973 arg, version, real_name);
974 } else {
975 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
976 arg, version);
977 }
978 }
979 return real_name;
980 }
981 }
982 ShouldNotReachHere();
983 return NULL;
984 }
985
986 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
987 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
988 // Set tagset string buffer at max size of 256, large enough for any alias tagset
989 const int max_tagset_size = 256;
990 int max_tagset_len = max_tagset_size - 1;
991 char tagset_buffer[max_tagset_size];
992 tagset_buffer[0] = '\0';
993
994 // Write tag-set for aliased logging option, in string list form
995 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
996 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
997 if (i > 0) {
998 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
999 }
1000 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1001 }
1002 if (!alf.exactMatch) {
1003 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1004 }
1005 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1006 (on) ? "+" : "-",
1007 name,
1008 tagset_buffer,
1009 (on) ? LogLevel::name(alf.level) : "off");
1010 }
1011
1012 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1013 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1014 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1015 if (strcmp(alf.alias_name, name) == 0) {
1016 log_deprecated_flag(name, on, alf);
1017 return alf;
1018 }
1019 }
1020 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1021 return a;
1022 }
1023
1024 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1025
1026 // range of acceptable characters spelled out for portability reasons
1027 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1028 #define BUFLEN 255
1029 char name[BUFLEN+1];
1030 char dummy;
1031 const char* real_name;
1032 bool warn_if_deprecated = true;
1033
1034 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1035 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1036 if (alf.alias_name != NULL){
1037 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1038 return true;
1039 }
1040 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1041 if (real_name == NULL) {
1042 return false;
1043 }
1044 return set_bool_flag(real_name, false, origin);
1045 }
1046 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1047 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1048 if (alf.alias_name != NULL){
1049 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1050 return true;
1051 }
1052 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1053 if (real_name == NULL) {
1054 return false;
1055 }
1056 return set_bool_flag(real_name, true, origin);
1057 }
1058
1059 char punct;
1060 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1061 const char* value = strchr(arg, '=') + 1;
1062 Flag* flag;
1063
1064 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1065 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1066 if (alf.alias_name != NULL) {
1067 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1068 return true;
1069 }
1070 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1071 if (real_name == NULL) {
1072 return false;
1073 }
1074 flag = Flag::find_flag(real_name);
1075 if (flag != NULL && flag->is_ccstr()) {
1076 if (flag->ccstr_accumulates()) {
1077 return append_to_string_flag(real_name, value, origin);
1078 } else {
1079 if (value[0] == '\0') {
1080 value = NULL;
1081 }
1082 return set_string_flag(real_name, value, origin);
1083 }
1084 } else {
1085 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1086 }
1087 }
1088
1089 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1090 const char* value = strchr(arg, '=') + 1;
1091 // -XX:Foo:=xxx will reset the string flag to the given value.
1092 if (value[0] == '\0') {
1093 value = NULL;
1094 }
1095 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1096 if (real_name == NULL) {
1097 return false;
1098 }
1099 return set_string_flag(real_name, value, origin);
1100 }
1101
1102 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1103 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1104 #define NUMBER_RANGE "[0123456789eE+-]"
1105 char value[BUFLEN + 1];
1106 char value2[BUFLEN + 1];
1107 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1108 // Looks like a floating-point number -- try again with more lenient format string
1109 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1110 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1111 if (real_name == NULL) {
1112 return false;
1113 }
1114 return set_fp_numeric_flag(real_name, value, origin);
1115 }
1116 }
1117
1118 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1119 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1120 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1121 if (real_name == NULL) {
1122 return false;
1123 }
1124 return set_numeric_flag(real_name, value, origin);
1125 }
1126
1127 return false;
1128 }
1129
1130 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1131 assert(bldarray != NULL, "illegal argument");
1132
1133 if (arg == NULL) {
1134 return;
1135 }
1136
1137 int new_count = *count + 1;
1138
1139 // expand the array and add arg to the last element
1140 if (*bldarray == NULL) {
1141 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1142 } else {
1143 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1144 }
1145 (*bldarray)[*count] = os::strdup_check_oom(arg);
1146 *count = new_count;
1147 }
1148
1149 void Arguments::build_jvm_args(const char* arg) {
1150 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1151 }
1152
1153 void Arguments::build_jvm_flags(const char* arg) {
1154 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1155 }
1156
1157 // utility function to return a string that concatenates all
1158 // strings in a given char** array
1159 const char* Arguments::build_resource_string(char** args, int count) {
1160 if (args == NULL || count == 0) {
1161 return NULL;
1162 }
1163 size_t length = 0;
1164 for (int i = 0; i < count; i++) {
1165 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1166 }
1167 char* s = NEW_RESOURCE_ARRAY(char, length);
1168 char* dst = s;
1169 for (int j = 0; j < count; j++) {
1170 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1171 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1172 dst += offset;
1173 length -= offset;
1174 }
1175 return (const char*) s;
1176 }
1177
1178 void Arguments::print_on(outputStream* st) {
1179 st->print_cr("VM Arguments:");
1180 if (num_jvm_flags() > 0) {
1181 st->print("jvm_flags: "); print_jvm_flags_on(st);
1182 st->cr();
1183 }
1184 if (num_jvm_args() > 0) {
1185 st->print("jvm_args: "); print_jvm_args_on(st);
1186 st->cr();
1187 }
1188 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1189 if (_java_class_path != NULL) {
1190 char* path = _java_class_path->value();
1191 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1192 }
1193 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1194 }
1195
1196 void Arguments::print_summary_on(outputStream* st) {
1197 // Print the command line. Environment variables that are helpful for
1198 // reproducing the problem are written later in the hs_err file.
1199 // flags are from setting file
1200 if (num_jvm_flags() > 0) {
1201 st->print_raw("Settings File: ");
1202 print_jvm_flags_on(st);
1203 st->cr();
1204 }
1205 // args are the command line and environment variable arguments.
1206 st->print_raw("Command Line: ");
1207 if (num_jvm_args() > 0) {
1208 print_jvm_args_on(st);
1209 }
1210 // this is the classfile and any arguments to the java program
1211 if (java_command() != NULL) {
1212 st->print("%s", java_command());
1213 }
1214 st->cr();
1215 }
1216
1217 void Arguments::print_jvm_flags_on(outputStream* st) {
1218 if (_num_jvm_flags > 0) {
1219 for (int i=0; i < _num_jvm_flags; i++) {
1220 st->print("%s ", _jvm_flags_array[i]);
1221 }
1222 }
1223 }
1224
1225 void Arguments::print_jvm_args_on(outputStream* st) {
1226 if (_num_jvm_args > 0) {
1227 for (int i=0; i < _num_jvm_args; i++) {
1228 st->print("%s ", _jvm_args_array[i]);
1229 }
1230 }
1231 }
1232
1233 bool Arguments::process_argument(const char* arg,
1234 jboolean ignore_unrecognized,
1235 Flag::Flags origin) {
1236 JDK_Version since = JDK_Version();
1237
1238 if (parse_argument(arg, origin)) {
1239 return true;
1240 }
1241
1242 // Determine if the flag has '+', '-', or '=' characters.
1243 bool has_plus_minus = (*arg == '+' || *arg == '-');
1244 const char* const argname = has_plus_minus ? arg + 1 : arg;
1245
1246 size_t arg_len;
1247 const char* equal_sign = strchr(argname, '=');
1248 if (equal_sign == NULL) {
1249 arg_len = strlen(argname);
1250 } else {
1251 arg_len = equal_sign - argname;
1252 }
1253
1254 // Only make the obsolete check for valid arguments.
1255 if (arg_len <= BUFLEN) {
1256 // Construct a string which consists only of the argument name without '+', '-', or '='.
1257 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1258 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1259 if (is_obsolete_flag(stripped_argname, &since)) {
1260 char version[256];
1261 since.to_string(version, sizeof(version));
1262 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1263 return true;
1264 }
1265 #ifndef PRODUCT
1266 else {
1267 const char* replacement;
1268 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1269 log_warning(arguments)("%s has been removed. Please use %s instead.",
1270 stripped_argname,
1271 replacement);
1272 return false;
1273 }
1274 }
1275 #endif //PRODUCT
1276 }
1277
1278 // For locked flags, report a custom error message if available.
1279 // Otherwise, report the standard unrecognized VM option.
1280 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1281 if (found_flag != NULL) {
1282 char locked_message_buf[BUFLEN];
1283 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1284 if (strlen(locked_message_buf) == 0) {
1285 if (found_flag->is_bool() && !has_plus_minus) {
1286 jio_fprintf(defaultStream::error_stream(),
1287 "Missing +/- setting for VM option '%s'\n", argname);
1288 } else if (!found_flag->is_bool() && has_plus_minus) {
1289 jio_fprintf(defaultStream::error_stream(),
1290 "Unexpected +/- setting in VM option '%s'\n", argname);
1291 } else {
1292 jio_fprintf(defaultStream::error_stream(),
1293 "Improperly specified VM option '%s'\n", argname);
1294 }
1295 } else {
1296 #ifdef PRODUCT
1297 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1298 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1299 if (ignore_unrecognized && mismatched) {
1300 return true;
1301 }
1302 #endif
1303 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1304 }
1305 } else {
1306 if (ignore_unrecognized) {
1307 return true;
1308 }
1309 jio_fprintf(defaultStream::error_stream(),
1310 "Unrecognized VM option '%s'\n", argname);
1311 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1312 if (fuzzy_matched != NULL) {
1313 jio_fprintf(defaultStream::error_stream(),
1314 "Did you mean '%s%s%s'? ",
1315 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1316 fuzzy_matched->_name,
1317 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1318 }
1319 }
1320
1321 // allow for commandline "commenting out" options like -XX:#+Verbose
1322 return arg[0] == '#';
1323 }
1324
1325 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1326 FILE* stream = fopen(file_name, "rb");
1327 if (stream == NULL) {
1328 if (should_exist) {
1329 jio_fprintf(defaultStream::error_stream(),
1330 "Could not open settings file %s\n", file_name);
1331 return false;
1332 } else {
1333 return true;
1334 }
1335 }
1336
1337 char token[1024];
1338 int pos = 0;
1339
1340 bool in_white_space = true;
1341 bool in_comment = false;
1342 bool in_quote = false;
1343 char quote_c = 0;
1344 bool result = true;
1345
1346 int c = getc(stream);
1347 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1348 if (in_white_space) {
1349 if (in_comment) {
1350 if (c == '\n') in_comment = false;
1351 } else {
1352 if (c == '#') in_comment = true;
1353 else if (!isspace(c)) {
1354 in_white_space = false;
1355 token[pos++] = c;
1356 }
1357 }
1358 } else {
1359 if (c == '\n' || (!in_quote && isspace(c))) {
1360 // token ends at newline, or at unquoted whitespace
1361 // this allows a way to include spaces in string-valued options
1362 token[pos] = '\0';
1363 logOption(token);
1364 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1365 build_jvm_flags(token);
1366 pos = 0;
1367 in_white_space = true;
1368 in_quote = false;
1369 } else if (!in_quote && (c == '\'' || c == '"')) {
1370 in_quote = true;
1371 quote_c = c;
1372 } else if (in_quote && (c == quote_c)) {
1373 in_quote = false;
1374 } else {
1375 token[pos++] = c;
1376 }
1377 }
1378 c = getc(stream);
1379 }
1380 if (pos > 0) {
1381 token[pos] = '\0';
1382 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1383 build_jvm_flags(token);
1384 }
1385 fclose(stream);
1386 return result;
1387 }
1388
1389 //=============================================================================================================
1390 // Parsing of properties (-D)
1391
1392 const char* Arguments::get_property(const char* key) {
1393 return PropertyList_get_value(system_properties(), key);
1394 }
1395
1396 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1397 const char* eq = strchr(prop, '=');
1398 const char* key;
1399 const char* value = "";
1400
1401 if (eq == NULL) {
1402 // property doesn't have a value, thus use passed string
1403 key = prop;
1404 } else {
1405 // property have a value, thus extract it and save to the
1406 // allocated string
1407 size_t key_len = eq - prop;
1408 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1409
1410 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1411 key = tmp_key;
1412
1413 value = &prop[key_len + 1];
1414 }
1415
1416 if (strcmp(key, "java.compiler") == 0) {
1417 process_java_compiler_argument(value);
1418 // Record value in Arguments, but let it get passed to Java.
1419 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1420 strcmp(key, "sun.java.launcher.pid") == 0) {
1421 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1422 // private and are processed in process_sun_java_launcher_properties();
1423 // the sun.java.launcher property is passed on to the java application
1424 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1425 // append is true, writable is true, internal is false
1426 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1427 WriteableProperty, ExternalProperty);
1428 } else {
1429 if (strcmp(key, "sun.java.command") == 0) {
1430 char *old_java_command = _java_command;
1431 _java_command = os::strdup_check_oom(value, mtArguments);
1432 if (old_java_command != NULL) {
1433 os::free(old_java_command);
1434 }
1435 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1436 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1437 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1438 // its value without going through the property list or making a Java call.
1439 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1440 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1441 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1442 os::free((void *)old_java_vendor_url_bug);
1443 }
1444 }
1445
1446 // Create new property and add at the end of the list
1447 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1448 }
1449
1450 if (key != prop) {
1451 // SystemProperty copy passed value, thus free previously allocated
1452 // memory
1453 FreeHeap((void *)key);
1454 }
1455
1456 return true;
1457 }
1458
1459 #if INCLUDE_CDS
1460 void Arguments::check_unsupported_dumping_properties() {
1461 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1462 const char* unsupported_properties[] = { "jdk.module.main",
1463 "jdk.module.limitmods",
1464 "jdk.module.path",
1465 "jdk.module.upgrade.path",
1466 "jdk.module.patch.0" };
1467 const char* unsupported_options[] = { "-m", // cannot use at dump time
1468 "--limit-modules", // ignored at dump time
1469 "--module-path", // ignored at dump time
1470 "--upgrade-module-path", // ignored at dump time
1471 "--patch-module" // ignored at dump time
1472 };
1473 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1474 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1475 // vm will exit with an error message. Otherwise, it will print an informational message if
1476 // -Xlog:cds is enabled.
1477 uint info_idx = 1;
1478 SystemProperty* sp = system_properties();
1479 while (sp != NULL) {
1480 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1481 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1482 if (i < info_idx) {
1483 vm_exit_during_initialization(
1484 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1485 } else {
1486 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1487 unsupported_options[i]);
1488 }
1489 }
1490 }
1491 sp = sp->next();
1492 }
1493
1494 // Check for an exploded module build in use with -Xshare:dump.
1495 if (!has_jimage()) {
1496 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1497 }
1498 }
1499 #endif
1500
1501 //===========================================================================================================
1502 // Setting int/mixed/comp mode flags
1503
1504 void Arguments::set_mode_flags(Mode mode) {
1505 // Set up default values for all flags.
1506 // If you add a flag to any of the branches below,
1507 // add a default value for it here.
1508 set_java_compiler(false);
1509 _mode = mode;
1510
1511 // Ensure Agent_OnLoad has the correct initial values.
1512 // This may not be the final mode; mode may change later in onload phase.
1513 PropertyList_unique_add(&_system_properties, "java.vm.info",
1514 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1515
1516 UseInterpreter = true;
1517 UseCompiler = true;
1518 UseLoopCounter = true;
1519
1520 // Default values may be platform/compiler dependent -
1521 // use the saved values
1522 ClipInlining = Arguments::_ClipInlining;
1523 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1524 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1525 BackgroundCompilation = Arguments::_BackgroundCompilation;
1526 if (TieredCompilation) {
1527 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1528 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1529 }
1530 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1531 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1532 }
1533 }
1534
1535 // Change from defaults based on mode
1536 switch (mode) {
1537 default:
1538 ShouldNotReachHere();
1539 break;
1540 case _int:
1541 UseCompiler = false;
1542 UseLoopCounter = false;
1543 AlwaysCompileLoopMethods = false;
1544 UseOnStackReplacement = false;
1545 break;
1546 case _mixed:
1547 // same as default
1548 break;
1549 case _comp:
1550 UseInterpreter = false;
1551 BackgroundCompilation = false;
1552 ClipInlining = false;
1553 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1554 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1555 // compile a level 4 (C2) and then continue executing it.
1556 if (TieredCompilation) {
1557 Tier3InvokeNotifyFreqLog = 0;
1558 Tier4InvocationThreshold = 0;
1559 }
1560 break;
1561 }
1562 }
1563
1564 // Conflict: required to use shared spaces (-Xshare:on), but
1565 // incompatible command line options were chosen.
1566 static void no_shared_spaces(const char* message) {
1567 if (RequireSharedSpaces) {
1568 jio_fprintf(defaultStream::error_stream(),
1569 "Class data sharing is inconsistent with other specified options.\n");
1570 vm_exit_during_initialization("Unable to use shared archive.", message);
1571 } else {
1572 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1573 }
1574 }
1575
1576 // Returns threshold scaled with the value of scale.
1577 // If scale < 0.0, threshold is returned without scaling.
1578 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1579 if (scale == 1.0 || scale < 0.0) {
1580 return threshold;
1581 } else {
1582 return (intx)(threshold * scale);
1583 }
1584 }
1585
1586 // Returns freq_log scaled with the value of scale.
1587 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1588 // If scale < 0.0, freq_log is returned without scaling.
1589 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1590 // Check if scaling is necessary or if negative value was specified.
1591 if (scale == 1.0 || scale < 0.0) {
1592 return freq_log;
1593 }
1594 // Check values to avoid calculating log2 of 0.
1595 if (scale == 0.0 || freq_log == 0) {
1596 return 0;
1597 }
1598 // Determine the maximum notification frequency value currently supported.
1599 // The largest mask value that the interpreter/C1 can handle is
1600 // of length InvocationCounter::number_of_count_bits. Mask values are always
1601 // one bit shorter then the value of the notification frequency. Set
1602 // max_freq_bits accordingly.
1603 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1604 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1605 if (scaled_freq == 0) {
1606 // Return 0 right away to avoid calculating log2 of 0.
1607 return 0;
1608 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1609 return max_freq_bits;
1610 } else {
1611 return log2_intptr(scaled_freq);
1612 }
1613 }
1614
1615 void Arguments::set_tiered_flags() {
1616 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1617 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1618 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1619 }
1620 if (CompilationPolicyChoice < 2) {
1621 vm_exit_during_initialization(
1622 "Incompatible compilation policy selected", NULL);
1623 }
1624 // Increase the code cache size - tiered compiles a lot more.
1625 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1626 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1627 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1628 }
1629 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1630 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1631 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1632 }
1633 if (!UseInterpreter) { // -Xcomp
1634 Tier3InvokeNotifyFreqLog = 0;
1635 Tier4InvocationThreshold = 0;
1636 }
1637
1638 if (CompileThresholdScaling < 0) {
1639 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1640 }
1641
1642 // Scale tiered compilation thresholds.
1643 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1644 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1645 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1646 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1647
1648 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1649 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1650 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1651 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1652
1653 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1654 // once these thresholds become supported.
1655
1656 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1657 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1658
1659 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1660 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1661
1662 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1663
1664 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1665 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1666 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1667 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1668 }
1669 }
1670
1671 void set_object_alignment() {
1672 // Object alignment.
1673 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1674 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1675 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1676 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1677 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1678 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1679
1680 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1681 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1682
1683 // Oop encoding heap max
1684 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1685
1686 if (SurvivorAlignmentInBytes == 0) {
1687 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1688 }
1689 }
1690
1691 size_t Arguments::max_heap_for_compressed_oops() {
1692 // Avoid sign flip.
1693 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1694 // We need to fit both the NULL page and the heap into the memory budget, while
1695 // keeping alignment constraints of the heap. To guarantee the latter, as the
1696 // NULL page is located before the heap, we pad the NULL page to the conservative
1697 // maximum alignment that the GC may ever impose upon the heap.
1698 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1699 _conservative_max_heap_alignment);
1700
1701 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1702 NOT_LP64(ShouldNotReachHere(); return 0);
1703 }
1704
1705 void Arguments::set_use_compressed_oops() {
1706 #ifndef ZERO
1707 #ifdef _LP64
1708 // MaxHeapSize is not set up properly at this point, but
1709 // the only value that can override MaxHeapSize if we are
1710 // to use UseCompressedOops is InitialHeapSize.
1711 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1712
1713 if (max_heap_size <= max_heap_for_compressed_oops()) {
1714 #if !defined(COMPILER1) || defined(TIERED)
1715 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1716 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1717 }
1718 #endif
1719 } else {
1720 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1721 warning("Max heap size too large for Compressed Oops");
1722 FLAG_SET_DEFAULT(UseCompressedOops, false);
1723 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1724 }
1725 }
1726 #endif // _LP64
1727 #endif // ZERO
1728 }
1729
1730
1731 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1732 // set_use_compressed_oops().
1733 void Arguments::set_use_compressed_klass_ptrs() {
1734 #ifndef ZERO
1735 #ifdef _LP64
1736 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1737 if (!UseCompressedOops) {
1738 if (UseCompressedClassPointers) {
1739 warning("UseCompressedClassPointers requires UseCompressedOops");
1740 }
1741 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1742 } else {
1743 // Turn on UseCompressedClassPointers too
1744 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1745 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1746 }
1747 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1748 if (UseCompressedClassPointers) {
1749 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1750 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1751 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1752 }
1753 }
1754 }
1755 #endif // _LP64
1756 #endif // !ZERO
1757 }
1758
1759 void Arguments::set_conservative_max_heap_alignment() {
1760 // The conservative maximum required alignment for the heap is the maximum of
1761 // the alignments imposed by several sources: any requirements from the heap
1762 // itself, the collector policy and the maximum page size we may run the VM
1763 // with.
1764 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1765 _conservative_max_heap_alignment = MAX4(heap_alignment,
1766 (size_t)os::vm_allocation_granularity(),
1767 os::max_page_size(),
1768 CollectorPolicy::compute_heap_alignment());
1769 }
1770
1771 #ifdef TIERED
1772 bool Arguments::compilation_mode_selected() {
1773 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1774 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1775
1776 }
1777
1778 void Arguments::select_compilation_mode_ergonomically() {
1779 #if defined(_WINDOWS) && !defined(_LP64)
1780 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1781 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1782 }
1783 #endif
1784 if (NeverActAsServerClassMachine) {
1785 set_client_compilation_mode();
1786 }
1787 }
1788 #endif //TIERED
1789
1790 #if INCLUDE_JVMCI
1791 void Arguments::set_jvmci_specific_flags() {
1792 if (UseJVMCICompiler) {
1793 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1794 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1795 }
1796 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1797 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1798 }
1799 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1800 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1801 }
1802 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1803 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1804 }
1805 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1806 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1807 }
1808 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1809 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1810 }
1811 if (TieredStopAtLevel != CompLevel_full_optimization) {
1812 // Currently JVMCI compiler can only work at the full optimization level
1813 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1814 TieredStopAtLevel = CompLevel_full_optimization;
1815 }
1816 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1817 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1818 }
1819 }
1820 }
1821 #endif
1822
1823 jint Arguments::set_ergonomics_flags() {
1824 #ifdef TIERED
1825 if (!compilation_mode_selected()) {
1826 select_compilation_mode_ergonomically();
1827 }
1828 #endif
1829
1830 GCConfig::initialize();
1831
1832 #if COMPILER2_OR_JVMCI
1833 // Shared spaces work fine with other GCs but causes bytecode rewriting
1834 // to be disabled, which hurts interpreter performance and decreases
1835 // server performance. When -server is specified, keep the default off
1836 // unless it is asked for. Future work: either add bytecode rewriting
1837 // at link time, or rewrite bytecodes in non-shared methods.
1838 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1839 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1840 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1841 }
1842 #endif
1843
1844 #if defined(IA32)
1845 // Only server compiler can optimize safepoints well enough.
1846 if (!is_server_compilation_mode_vm()) {
1847 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1848 }
1849 #endif
1850
1851 set_conservative_max_heap_alignment();
1852
1853 #ifndef ZERO
1854 #ifdef _LP64
1855 set_use_compressed_oops();
1856
1857 // set_use_compressed_klass_ptrs() must be called after calling
1858 // set_use_compressed_oops().
1859 set_use_compressed_klass_ptrs();
1860
1861 // Also checks that certain machines are slower with compressed oops
1862 // in vm_version initialization code.
1863 #endif // _LP64
1864 #endif // !ZERO
1865
1866 return JNI_OK;
1867 }
1868
1869 julong Arguments::limit_by_allocatable_memory(julong limit) {
1870 julong max_allocatable;
1871 julong result = limit;
1872 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1873 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1874 }
1875 return result;
1876 }
1877
1878 // Use static initialization to get the default before parsing
1879 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1880
1881 void Arguments::set_heap_size() {
1882 julong phys_mem =
1883 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1884 : (julong)MaxRAM;
1885
1886 // Convert deprecated flags
1887 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1888 !FLAG_IS_DEFAULT(MaxRAMFraction))
1889 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1890
1891 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1892 !FLAG_IS_DEFAULT(MinRAMFraction))
1893 MinRAMPercentage = 100.0 / MinRAMFraction;
1894
1895 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1896 !FLAG_IS_DEFAULT(InitialRAMFraction))
1897 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1898
1899 // If the maximum heap size has not been set with -Xmx,
1900 // then set it as fraction of the size of physical memory,
1901 // respecting the maximum and minimum sizes of the heap.
1902 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1903 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1904 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1905 if (reasonable_min < MaxHeapSize) {
1906 // Small physical memory, so use a minimum fraction of it for the heap
1907 reasonable_max = reasonable_min;
1908 } else {
1909 // Not-small physical memory, so require a heap at least
1910 // as large as MaxHeapSize
1911 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1912 }
1913
1914 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1915 // Limit the heap size to ErgoHeapSizeLimit
1916 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1917 }
1918 if (UseCompressedOops) {
1919 // Limit the heap size to the maximum possible when using compressed oops
1920 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1921
1922 // HeapBaseMinAddress can be greater than default but not less than.
1923 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1924 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1925 // matches compressed oops printing flags
1926 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1927 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1928 DefaultHeapBaseMinAddress,
1929 DefaultHeapBaseMinAddress/G,
1930 HeapBaseMinAddress);
1931 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1932 }
1933 }
1934
1935 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1936 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1937 // but it should be not less than default MaxHeapSize.
1938 max_coop_heap -= HeapBaseMinAddress;
1939 }
1940 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1941 }
1942 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1943
1944 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1945 // An initial heap size was specified on the command line,
1946 // so be sure that the maximum size is consistent. Done
1947 // after call to limit_by_allocatable_memory because that
1948 // method might reduce the allocation size.
1949 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1950 }
1951
1952 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1953 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1954 }
1955
1956 // If the minimum or initial heap_size have not been set or requested to be set
1957 // ergonomically, set them accordingly.
1958 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1959 julong reasonable_minimum = (julong)(OldSize + NewSize);
1960
1961 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1962
1963 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1964
1965 if (InitialHeapSize == 0) {
1966 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1967
1968 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1969 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1970
1971 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1972
1973 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1974 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1975 }
1976 // If the minimum heap size has not been set (via -Xms),
1977 // synchronize with InitialHeapSize to avoid errors with the default value.
1978 if (min_heap_size() == 0) {
1979 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1980 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1981 }
1982 }
1983 }
1984
1985 // This option inspects the machine and attempts to set various
1986 // parameters to be optimal for long-running, memory allocation
1987 // intensive jobs. It is intended for machines with large
1988 // amounts of cpu and memory.
1989 jint Arguments::set_aggressive_heap_flags() {
1990 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1991 // VM, but we may not be able to represent the total physical memory
1992 // available (like having 8gb of memory on a box but using a 32bit VM).
1993 // Thus, we need to make sure we're using a julong for intermediate
1994 // calculations.
1995 julong initHeapSize;
1996 julong total_memory = os::physical_memory();
1997
1998 if (total_memory < (julong) 256 * M) {
1999 jio_fprintf(defaultStream::error_stream(),
2000 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2001 vm_exit(1);
2002 }
2003
2004 // The heap size is half of available memory, or (at most)
2005 // all of possible memory less 160mb (leaving room for the OS
2006 // when using ISM). This is the maximum; because adaptive sizing
2007 // is turned on below, the actual space used may be smaller.
2008
2009 initHeapSize = MIN2(total_memory / (julong) 2,
2010 total_memory - (julong) 160 * M);
2011
2012 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2013
2014 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2015 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2016 return JNI_EINVAL;
2017 }
2018 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2019 return JNI_EINVAL;
2020 }
2021 // Currently the minimum size and the initial heap sizes are the same.
2022 set_min_heap_size(initHeapSize);
2023 }
2024 if (FLAG_IS_DEFAULT(NewSize)) {
2025 // Make the young generation 3/8ths of the total heap.
2026 if (FLAG_SET_CMDLINE(size_t, NewSize,
2027 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2028 return JNI_EINVAL;
2029 }
2030 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2031 return JNI_EINVAL;
2032 }
2033 }
2034
2035 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2036 FLAG_SET_DEFAULT(UseLargePages, true);
2037 #endif
2038
2039 // Increase some data structure sizes for efficiency
2040 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2041 return JNI_EINVAL;
2042 }
2043 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2044 return JNI_EINVAL;
2045 }
2046 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2047 return JNI_EINVAL;
2048 }
2049
2050 // See the OldPLABSize comment below, but replace 'after promotion'
2051 // with 'after copying'. YoungPLABSize is the size of the survivor
2052 // space per-gc-thread buffers. The default is 4kw.
2053 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2054 return JNI_EINVAL;
2055 }
2056
2057 // OldPLABSize is the size of the buffers in the old gen that
2058 // UseParallelGC uses to promote live data that doesn't fit in the
2059 // survivor spaces. At any given time, there's one for each gc thread.
2060 // The default size is 1kw. These buffers are rarely used, since the
2061 // survivor spaces are usually big enough. For specjbb, however, there
2062 // are occasions when there's lots of live data in the young gen
2063 // and we end up promoting some of it. We don't have a definite
2064 // explanation for why bumping OldPLABSize helps, but the theory
2065 // is that a bigger PLAB results in retaining something like the
2066 // original allocation order after promotion, which improves mutator
2067 // locality. A minor effect may be that larger PLABs reduce the
2068 // number of PLAB allocation events during gc. The value of 8kw
2069 // was arrived at by experimenting with specjbb.
2070 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2071 return JNI_EINVAL;
2072 }
2073
2074 // Enable parallel GC and adaptive generation sizing
2075 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2076 return JNI_EINVAL;
2077 }
2078
2079 // Encourage steady state memory management
2080 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2081 return JNI_EINVAL;
2082 }
2083
2084 // This appears to improve mutator locality
2085 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2086 return JNI_EINVAL;
2087 }
2088
2089 // Get around early Solaris scheduling bug
2090 // (affinity vs other jobs on system)
2091 // but disallow DR and offlining (5008695).
2092 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2093 return JNI_EINVAL;
2094 }
2095
2096 return JNI_OK;
2097 }
2098
2099 // This must be called after ergonomics.
2100 void Arguments::set_bytecode_flags() {
2101 if (!RewriteBytecodes) {
2102 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2103 }
2104 }
2105
2106 // Aggressive optimization flags -XX:+AggressiveOpts
2107 jint Arguments::set_aggressive_opts_flags() {
2108 #ifdef COMPILER2
2109 if (AggressiveUnboxing) {
2110 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2111 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2112 } else if (!EliminateAutoBox) {
2113 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2114 AggressiveUnboxing = false;
2115 }
2116 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2117 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2118 } else if (!DoEscapeAnalysis) {
2119 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2120 AggressiveUnboxing = false;
2121 }
2122 }
2123 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2124 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2125 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2126 }
2127 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2128 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2129 }
2130
2131 // Feed the cache size setting into the JDK
2132 char buffer[1024];
2133 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2134 if (!add_property(buffer)) {
2135 return JNI_ENOMEM;
2136 }
2137 }
2138 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2139 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2140 }
2141 #endif
2142
2143 if (AggressiveOpts) {
2144 // Sample flag setting code
2145 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2146 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2147 // }
2148 }
2149
2150 return JNI_OK;
2151 }
2152
2153 //===========================================================================================================
2154 // Parsing of java.compiler property
2155
2156 void Arguments::process_java_compiler_argument(const char* arg) {
2157 // For backwards compatibility, Djava.compiler=NONE or ""
2158 // causes us to switch to -Xint mode UNLESS -Xdebug
2159 // is also specified.
2160 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2161 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2162 }
2163 }
2164
2165 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2166 _sun_java_launcher = os::strdup_check_oom(launcher);
2167 }
2168
2169 bool Arguments::created_by_java_launcher() {
2170 assert(_sun_java_launcher != NULL, "property must have value");
2171 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2172 }
2173
2174 bool Arguments::sun_java_launcher_is_altjvm() {
2175 return _sun_java_launcher_is_altjvm;
2176 }
2177
2178 //===========================================================================================================
2179 // Parsing of main arguments
2180
2181 #if INCLUDE_JVMCI
2182 // Check consistency of jvmci vm argument settings.
2183 bool Arguments::check_jvmci_args_consistency() {
2184 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2185 }
2186 #endif //INCLUDE_JVMCI
2187
2188 // Check the consistency of vm_init_args
2189 bool Arguments::check_vm_args_consistency() {
2190 // Method for adding checks for flag consistency.
2191 // The intent is to warn the user of all possible conflicts,
2192 // before returning an error.
2193 // Note: Needs platform-dependent factoring.
2194 bool status = true;
2195
2196 if (TLABRefillWasteFraction == 0) {
2197 jio_fprintf(defaultStream::error_stream(),
2198 "TLABRefillWasteFraction should be a denominator, "
2199 "not " SIZE_FORMAT "\n",
2200 TLABRefillWasteFraction);
2201 status = false;
2202 }
2203
2204 if (PrintNMTStatistics) {
2205 #if INCLUDE_NMT
2206 if (MemTracker::tracking_level() == NMT_off) {
2207 #endif // INCLUDE_NMT
2208 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2209 PrintNMTStatistics = false;
2210 #if INCLUDE_NMT
2211 }
2212 #endif
2213 }
2214
2215 #if INCLUDE_JVMCI
2216 status = status && check_jvmci_args_consistency();
2217
2218 if (EnableJVMCI) {
2219 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2220 AddProperty, UnwriteableProperty, InternalProperty);
2221
2222 if (!ScavengeRootsInCode) {
2223 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2224 ScavengeRootsInCode = 1;
2225 }
2226 }
2227 #endif
2228
2229 // Check lower bounds of the code cache
2230 // Template Interpreter code is approximately 3X larger in debug builds.
2231 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2232 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2233 jio_fprintf(defaultStream::error_stream(),
2234 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2235 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2236 status = false;
2237 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2238 jio_fprintf(defaultStream::error_stream(),
2239 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2240 min_code_cache_size/K);
2241 status = false;
2242 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2243 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2244 jio_fprintf(defaultStream::error_stream(),
2245 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2246 CODE_CACHE_SIZE_LIMIT/M);
2247 status = false;
2248 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2249 jio_fprintf(defaultStream::error_stream(),
2250 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2251 min_code_cache_size/K);
2252 status = false;
2253 }
2254
2255 #ifdef _LP64
2256 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2257 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2258 }
2259 #endif
2260
2261 #ifndef SUPPORT_RESERVED_STACK_AREA
2262 if (StackReservedPages != 0) {
2263 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2264 warning("Reserved Stack Area not supported on this platform");
2265 }
2266 #endif
2267
2268 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2269 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2270 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2271 }
2272 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2273 }
2274 if (UseCompiler && is_interpreter_only()) {
2275 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2276 warning("UseCompiler disabled due to -Xint.");
2277 }
2278 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2279 }
2280 #ifdef COMPILER2
2281 if (PostLoopMultiversioning && !RangeCheckElimination) {
2282 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2283 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2284 }
2285 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2286 }
2287 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2288 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2289 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2290 }
2291 LoopStripMiningIter = 1;
2292 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2293 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2294 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2295 }
2296 LoopStripMiningIter = 0;
2297 }
2298 #endif
2299 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2300 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2301 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2302 }
2303 }
2304 return status;
2305 }
2306
2307 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2308 const char* option_type) {
2309 if (ignore) return false;
2310
2311 const char* spacer = " ";
2312 if (option_type == NULL) {
2313 option_type = ++spacer; // Set both to the empty string.
2314 }
2315
2316 if (os::obsolete_option(option)) {
2317 jio_fprintf(defaultStream::error_stream(),
2318 "Obsolete %s%soption: %s\n", option_type, spacer,
2319 option->optionString);
2320 return false;
2321 } else {
2322 jio_fprintf(defaultStream::error_stream(),
2323 "Unrecognized %s%soption: %s\n", option_type, spacer,
2324 option->optionString);
2325 return true;
2326 }
2327 }
2328
2329 static const char* user_assertion_options[] = {
2330 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2331 };
2332
2333 static const char* system_assertion_options[] = {
2334 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2335 };
2336
2337 bool Arguments::parse_uintx(const char* value,
2338 uintx* uintx_arg,
2339 uintx min_size) {
2340
2341 // Check the sign first since atojulong() parses only unsigned values.
2342 bool value_is_positive = !(*value == '-');
2343
2344 if (value_is_positive) {
2345 julong n;
2346 bool good_return = atojulong(value, &n);
2347 if (good_return) {
2348 bool above_minimum = n >= min_size;
2349 bool value_is_too_large = n > max_uintx;
2350
2351 if (above_minimum && !value_is_too_large) {
2352 *uintx_arg = n;
2353 return true;
2354 }
2355 }
2356 }
2357 return false;
2358 }
2359
2360 unsigned int addreads_count = 0;
2361 unsigned int addexports_count = 0;
2362 unsigned int addopens_count = 0;
2363 unsigned int addmods_count = 0;
2364 unsigned int patch_mod_count = 0;
2365
2366 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2367 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2368 char* property = AllocateHeap(prop_len, mtArguments);
2369 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2370 if (ret < 0 || ret >= (int)prop_len) {
2371 FreeHeap(property);
2372 return false;
2373 }
2374 bool added = add_property(property, UnwriteableProperty, internal);
2375 FreeHeap(property);
2376 return added;
2377 }
2378
2379 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2380 const unsigned int props_count_limit = 1000;
2381 const int max_digits = 3;
2382 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2383
2384 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2385 if (count < props_count_limit) {
2386 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2387 char* property = AllocateHeap(prop_len, mtArguments);
2388 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2389 if (ret < 0 || ret >= (int)prop_len) {
2390 FreeHeap(property);
2391 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2392 return false;
2393 }
2394 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2395 FreeHeap(property);
2396 return added;
2397 }
2398
2399 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2400 return false;
2401 }
2402
2403 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2404 julong* long_arg,
2405 julong min_size,
2406 julong max_size) {
2407 if (!atojulong(s, long_arg)) return arg_unreadable;
2408 return check_memory_size(*long_arg, min_size, max_size);
2409 }
2410
2411 // Parse JavaVMInitArgs structure
2412
2413 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2414 const JavaVMInitArgs *java_options_args,
2415 const JavaVMInitArgs *cmd_line_args) {
2416 bool patch_mod_javabase = false;
2417
2418 // Save default settings for some mode flags
2419 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2420 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2421 Arguments::_ClipInlining = ClipInlining;
2422 Arguments::_BackgroundCompilation = BackgroundCompilation;
2423 if (TieredCompilation) {
2424 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2425 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2426 }
2427
2428 // Setup flags for mixed which is the default
2429 set_mode_flags(_mixed);
2430
2431 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2432 // variable (if present).
2433 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2434 if (result != JNI_OK) {
2435 return result;
2436 }
2437
2438 // Parse args structure generated from the command line flags.
2439 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2440 if (result != JNI_OK) {
2441 return result;
2442 }
2443
2444 // Parse args structure generated from the _JAVA_OPTIONS environment
2445 // variable (if present) (mimics classic VM)
2446 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2447 if (result != JNI_OK) {
2448 return result;
2449 }
2450
2451 // We need to ensure processor and memory resources have been properly
2452 // configured - which may rely on arguments we just processed - before
2453 // doing the final argument processing. Any argument processing that
2454 // needs to know about processor and memory resources must occur after
2455 // this point.
2456
2457 os::init_container_support();
2458
2459 // Do final processing now that all arguments have been parsed
2460 result = finalize_vm_init_args(patch_mod_javabase);
2461 if (result != JNI_OK) {
2462 return result;
2463 }
2464
2465 return JNI_OK;
2466 }
2467
2468 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2469 // represents a valid JDWP agent. is_path==true denotes that we
2470 // are dealing with -agentpath (case where name is a path), otherwise with
2471 // -agentlib
2472 bool valid_jdwp_agent(char *name, bool is_path) {
2473 char *_name;
2474 const char *_jdwp = "jdwp";
2475 size_t _len_jdwp, _len_prefix;
2476
2477 if (is_path) {
2478 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2479 return false;
2480 }
2481
2482 _name++; // skip past last path separator
2483 _len_prefix = strlen(JNI_LIB_PREFIX);
2484
2485 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2486 return false;
2487 }
2488
2489 _name += _len_prefix;
2490 _len_jdwp = strlen(_jdwp);
2491
2492 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2493 _name += _len_jdwp;
2494 }
2495 else {
2496 return false;
2497 }
2498
2499 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2500 return false;
2501 }
2502
2503 return true;
2504 }
2505
2506 if (strcmp(name, _jdwp) == 0) {
2507 return true;
2508 }
2509
2510 return false;
2511 }
2512
2513 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2514 // --patch-module=<module>=<file>(<pathsep><file>)*
2515 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2516 // Find the equal sign between the module name and the path specification
2517 const char* module_equal = strchr(patch_mod_tail, '=');
2518 if (module_equal == NULL) {
2519 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2520 return JNI_ERR;
2521 } else {
2522 // Pick out the module name
2523 size_t module_len = module_equal - patch_mod_tail;
2524 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2525 if (module_name != NULL) {
2526 memcpy(module_name, patch_mod_tail, module_len);
2527 *(module_name + module_len) = '\0';
2528 // The path piece begins one past the module_equal sign
2529 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2530 FREE_C_HEAP_ARRAY(char, module_name);
2531 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2532 return JNI_ENOMEM;
2533 }
2534 } else {
2535 return JNI_ENOMEM;
2536 }
2537 }
2538 return JNI_OK;
2539 }
2540
2541 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2542 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2543 // The min and max sizes match the values in globals.hpp, but scaled
2544 // with K. The values have been chosen so that alignment with page
2545 // size doesn't change the max value, which makes the conversions
2546 // back and forth between Xss value and ThreadStackSize value easier.
2547 // The values have also been chosen to fit inside a 32-bit signed type.
2548 const julong min_ThreadStackSize = 0;
2549 const julong max_ThreadStackSize = 1 * M;
2550
2551 const julong min_size = min_ThreadStackSize * K;
2552 const julong max_size = max_ThreadStackSize * K;
2553
2554 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2555
2556 julong size = 0;
2557 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2558 if (errcode != arg_in_range) {
2559 bool silent = (option == NULL); // Allow testing to silence error messages
2560 if (!silent) {
2561 jio_fprintf(defaultStream::error_stream(),
2562 "Invalid thread stack size: %s\n", option->optionString);
2563 describe_range_error(errcode);
2564 }
2565 return JNI_EINVAL;
2566 }
2567
2568 // Internally track ThreadStackSize in units of 1024 bytes.
2569 const julong size_aligned = align_up(size, K);
2570 assert(size <= size_aligned,
2571 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2572 size, size_aligned);
2573
2574 const julong size_in_K = size_aligned / K;
2575 assert(size_in_K < (julong)max_intx,
2576 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2577 size_in_K);
2578
2579 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2580 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2581 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2582 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2583 max_expanded, size_in_K);
2584
2585 *out_ThreadStackSize = (intx)size_in_K;
2586
2587 return JNI_OK;
2588 }
2589
2590 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2591 // For match_option to return remaining or value part of option string
2592 const char* tail;
2593
2594 // iterate over arguments
2595 for (int index = 0; index < args->nOptions; index++) {
2596 bool is_absolute_path = false; // for -agentpath vs -agentlib
2597
2598 const JavaVMOption* option = args->options + index;
2599
2600 if (!match_option(option, "-Djava.class.path", &tail) &&
2601 !match_option(option, "-Dsun.java.command", &tail) &&
2602 !match_option(option, "-Dsun.java.launcher", &tail)) {
2603
2604 // add all jvm options to the jvm_args string. This string
2605 // is used later to set the java.vm.args PerfData string constant.
2606 // the -Djava.class.path and the -Dsun.java.command options are
2607 // omitted from jvm_args string as each have their own PerfData
2608 // string constant object.
2609 build_jvm_args(option->optionString);
2610 }
2611
2612 // -verbose:[class/module/gc/jni]
2613 if (match_option(option, "-verbose", &tail)) {
2614 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2615 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2616 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2617 } else if (!strcmp(tail, ":module")) {
2618 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2619 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2620 } else if (!strcmp(tail, ":gc")) {
2621 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2622 } else if (!strcmp(tail, ":jni")) {
2623 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2624 return JNI_EINVAL;
2625 }
2626 }
2627 // -da / -ea / -disableassertions / -enableassertions
2628 // These accept an optional class/package name separated by a colon, e.g.,
2629 // -da:java.lang.Thread.
2630 } else if (match_option(option, user_assertion_options, &tail, true)) {
2631 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2632 if (*tail == '\0') {
2633 JavaAssertions::setUserClassDefault(enable);
2634 } else {
2635 assert(*tail == ':', "bogus match by match_option()");
2636 JavaAssertions::addOption(tail + 1, enable);
2637 }
2638 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2639 } else if (match_option(option, system_assertion_options, &tail, false)) {
2640 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2641 JavaAssertions::setSystemClassDefault(enable);
2642 // -bootclasspath:
2643 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2644 jio_fprintf(defaultStream::output_stream(),
2645 "-Xbootclasspath is no longer a supported option.\n");
2646 return JNI_EINVAL;
2647 // -bootclasspath/a:
2648 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2649 Arguments::append_sysclasspath(tail);
2650 // -bootclasspath/p:
2651 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2652 jio_fprintf(defaultStream::output_stream(),
2653 "-Xbootclasspath/p is no longer a supported option.\n");
2654 return JNI_EINVAL;
2655 // -Xrun
2656 } else if (match_option(option, "-Xrun", &tail)) {
2657 if (tail != NULL) {
2658 const char* pos = strchr(tail, ':');
2659 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2660 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2661 jio_snprintf(name, len + 1, "%s", tail);
2662
2663 char *options = NULL;
2664 if(pos != NULL) {
2665 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2666 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2667 }
2668 #if !INCLUDE_JVMTI
2669 if (strcmp(name, "jdwp") == 0) {
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Debugging agents are not supported in this VM\n");
2672 return JNI_ERR;
2673 }
2674 #endif // !INCLUDE_JVMTI
2675 add_init_library(name, options);
2676 }
2677 } else if (match_option(option, "--add-reads=", &tail)) {
2678 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2679 return JNI_ENOMEM;
2680 }
2681 } else if (match_option(option, "--add-exports=", &tail)) {
2682 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2683 return JNI_ENOMEM;
2684 }
2685 } else if (match_option(option, "--add-opens=", &tail)) {
2686 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2687 return JNI_ENOMEM;
2688 }
2689 } else if (match_option(option, "--add-modules=", &tail)) {
2690 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2691 return JNI_ENOMEM;
2692 }
2693 } else if (match_option(option, "--limit-modules=", &tail)) {
2694 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2695 return JNI_ENOMEM;
2696 }
2697 } else if (match_option(option, "--module-path=", &tail)) {
2698 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2699 return JNI_ENOMEM;
2700 }
2701 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2702 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2703 return JNI_ENOMEM;
2704 }
2705 } else if (match_option(option, "--patch-module=", &tail)) {
2706 // --patch-module=<module>=<file>(<pathsep><file>)*
2707 int res = process_patch_mod_option(tail, patch_mod_javabase);
2708 if (res != JNI_OK) {
2709 return res;
2710 }
2711 } else if (match_option(option, "--illegal-access=", &tail)) {
2712 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2713 return JNI_ENOMEM;
2714 }
2715 // -agentlib and -agentpath
2716 } else if (match_option(option, "-agentlib:", &tail) ||
2717 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2718 if(tail != NULL) {
2719 const char* pos = strchr(tail, '=');
2720 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2721 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2722 name[len] = '\0';
2723
2724 char *options = NULL;
2725 if(pos != NULL) {
2726 options = os::strdup_check_oom(pos + 1, mtArguments);
2727 }
2728 #if !INCLUDE_JVMTI
2729 if (valid_jdwp_agent(name, is_absolute_path)) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Debugging agents are not supported in this VM\n");
2732 return JNI_ERR;
2733 }
2734 #endif // !INCLUDE_JVMTI
2735 add_init_agent(name, options, is_absolute_path);
2736 }
2737 // -javaagent
2738 } else if (match_option(option, "-javaagent:", &tail)) {
2739 #if !INCLUDE_JVMTI
2740 jio_fprintf(defaultStream::error_stream(),
2741 "Instrumentation agents are not supported in this VM\n");
2742 return JNI_ERR;
2743 #else
2744 if (tail != NULL) {
2745 size_t length = strlen(tail) + 1;
2746 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2747 jio_snprintf(options, length, "%s", tail);
2748 add_instrument_agent("instrument", options, false);
2749 // java agents need module java.instrument
2750 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2751 return JNI_ENOMEM;
2752 }
2753 }
2754 #endif // !INCLUDE_JVMTI
2755 // -Xnoclassgc
2756 } else if (match_option(option, "-Xnoclassgc")) {
2757 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 // -Xconcgc
2761 } else if (match_option(option, "-Xconcgc")) {
2762 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2766 // -Xnoconcgc
2767 } else if (match_option(option, "-Xnoconcgc")) {
2768 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2772 // -Xbatch
2773 } else if (match_option(option, "-Xbatch")) {
2774 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 // -Xmn for compatibility with other JVM vendors
2778 } else if (match_option(option, "-Xmn", &tail)) {
2779 julong long_initial_young_size = 0;
2780 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2781 if (errcode != arg_in_range) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Invalid initial young generation size: %s\n", option->optionString);
2784 describe_range_error(errcode);
2785 return JNI_EINVAL;
2786 }
2787 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 // -Xms
2794 } else if (match_option(option, "-Xms", &tail)) {
2795 julong long_initial_heap_size = 0;
2796 // an initial heap size of 0 means automatically determine
2797 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2798 if (errcode != arg_in_range) {
2799 jio_fprintf(defaultStream::error_stream(),
2800 "Invalid initial heap size: %s\n", option->optionString);
2801 describe_range_error(errcode);
2802 return JNI_EINVAL;
2803 }
2804 set_min_heap_size((size_t)long_initial_heap_size);
2805 // Currently the minimum size and the initial heap sizes are the same.
2806 // Can be overridden with -XX:InitialHeapSize.
2807 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2808 return JNI_EINVAL;
2809 }
2810 // -Xmx
2811 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2812 julong long_max_heap_size = 0;
2813 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2814 if (errcode != arg_in_range) {
2815 jio_fprintf(defaultStream::error_stream(),
2816 "Invalid maximum heap size: %s\n", option->optionString);
2817 describe_range_error(errcode);
2818 return JNI_EINVAL;
2819 }
2820 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 // Xmaxf
2824 } else if (match_option(option, "-Xmaxf", &tail)) {
2825 char* err;
2826 int maxf = (int)(strtod(tail, &err) * 100);
2827 if (*err != '\0' || *tail == '\0') {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Bad max heap free percentage size: %s\n",
2830 option->optionString);
2831 return JNI_EINVAL;
2832 } else {
2833 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2834 return JNI_EINVAL;
2835 }
2836 }
2837 // Xminf
2838 } else if (match_option(option, "-Xminf", &tail)) {
2839 char* err;
2840 int minf = (int)(strtod(tail, &err) * 100);
2841 if (*err != '\0' || *tail == '\0') {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Bad min heap free percentage size: %s\n",
2844 option->optionString);
2845 return JNI_EINVAL;
2846 } else {
2847 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850 }
2851 // -Xss
2852 } else if (match_option(option, "-Xss", &tail)) {
2853 intx value = 0;
2854 jint err = parse_xss(option, tail, &value);
2855 if (err != JNI_OK) {
2856 return err;
2857 }
2858 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2862 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2863 julong long_ReservedCodeCacheSize = 0;
2864
2865 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2866 if (errcode != arg_in_range) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Invalid maximum code cache size: %s.\n", option->optionString);
2869 return JNI_EINVAL;
2870 }
2871 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2872 return JNI_EINVAL;
2873 }
2874 // -green
2875 } else if (match_option(option, "-green")) {
2876 jio_fprintf(defaultStream::error_stream(),
2877 "Green threads support not available\n");
2878 return JNI_EINVAL;
2879 // -native
2880 } else if (match_option(option, "-native")) {
2881 // HotSpot always uses native threads, ignore silently for compatibility
2882 // -Xrs
2883 } else if (match_option(option, "-Xrs")) {
2884 // Classic/EVM option, new functionality
2885 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 // -Xprof
2889 } else if (match_option(option, "-Xprof")) {
2890 char version[256];
2891 // Obsolete in JDK 10
2892 JDK_Version::jdk(10).to_string(version, sizeof(version));
2893 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2894 // -Xconcurrentio
2895 } else if (match_option(option, "-Xconcurrentio")) {
2896 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2903 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2907 return JNI_EINVAL;
2908 }
2909
2910 // -Xinternalversion
2911 } else if (match_option(option, "-Xinternalversion")) {
2912 jio_fprintf(defaultStream::output_stream(), "%s\n",
2913 VM_Version::internal_vm_info_string());
2914 vm_exit(0);
2915 #ifndef PRODUCT
2916 // -Xprintflags
2917 } else if (match_option(option, "-Xprintflags")) {
2918 CommandLineFlags::printFlags(tty, false);
2919 vm_exit(0);
2920 #endif
2921 // -D
2922 } else if (match_option(option, "-D", &tail)) {
2923 const char* value;
2924 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2925 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2926 // abort if -Djava.endorsed.dirs is set
2927 jio_fprintf(defaultStream::output_stream(),
2928 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2929 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2930 return JNI_EINVAL;
2931 }
2932 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2933 *value != '\0' && strcmp(value, "\"\"") != 0) {
2934 // abort if -Djava.ext.dirs is set
2935 jio_fprintf(defaultStream::output_stream(),
2936 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2937 return JNI_EINVAL;
2938 }
2939 // Check for module related properties. They must be set using the modules
2940 // options. For example: use "--add-modules=java.sql", not
2941 // "-Djdk.module.addmods=java.sql"
2942 if (is_internal_module_property(option->optionString + 2)) {
2943 needs_module_property_warning = true;
2944 continue;
2945 }
2946
2947 if (!add_property(tail)) {
2948 return JNI_ENOMEM;
2949 }
2950 // Out of the box management support
2951 if (match_option(option, "-Dcom.sun.management", &tail)) {
2952 #if INCLUDE_MANAGEMENT
2953 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 // management agent in module jdk.management.agent
2957 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2958 return JNI_ENOMEM;
2959 }
2960 #else
2961 jio_fprintf(defaultStream::output_stream(),
2962 "-Dcom.sun.management is not supported in this VM.\n");
2963 return JNI_ERR;
2964 #endif
2965 }
2966 // -Xint
2967 } else if (match_option(option, "-Xint")) {
2968 set_mode_flags(_int);
2969 // -Xmixed
2970 } else if (match_option(option, "-Xmixed")) {
2971 set_mode_flags(_mixed);
2972 // -Xcomp
2973 } else if (match_option(option, "-Xcomp")) {
2974 // for testing the compiler; turn off all flags that inhibit compilation
2975 set_mode_flags(_comp);
2976 // -Xshare:dump
2977 } else if (match_option(option, "-Xshare:dump")) {
2978 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981 set_mode_flags(_int); // Prevent compilation, which creates objects
2982 // -Xshare:on
2983 } else if (match_option(option, "-Xshare:on")) {
2984 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2985 return JNI_EINVAL;
2986 }
2987 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 // -Xshare:auto
2991 } else if (match_option(option, "-Xshare:auto")) {
2992 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2993 return JNI_EINVAL;
2994 }
2995 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2996 return JNI_EINVAL;
2997 }
2998 // -Xshare:off
2999 } else if (match_option(option, "-Xshare:off")) {
3000 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 // -Xverify
3007 } else if (match_option(option, "-Xverify", &tail)) {
3008 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3009 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3010 return JNI_EINVAL;
3011 }
3012 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 } else if (strcmp(tail, ":remote") == 0) {
3016 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3017 return JNI_EINVAL;
3018 }
3019 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3020 return JNI_EINVAL;
3021 }
3022 } else if (strcmp(tail, ":none") == 0) {
3023 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3024 return JNI_EINVAL;
3025 }
3026 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3027 return JNI_EINVAL;
3028 }
3029 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3030 return JNI_EINVAL;
3031 }
3032 // -Xdebug
3033 } else if (match_option(option, "-Xdebug")) {
3034 // note this flag has been used, then ignore
3035 set_xdebug_mode(true);
3036 // -Xnoagent
3037 } else if (match_option(option, "-Xnoagent")) {
3038 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3039 } else if (match_option(option, "-Xloggc:", &tail)) {
3040 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3041 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3042 _gc_log_filename = os::strdup_check_oom(tail);
3043 } else if (match_option(option, "-Xlog", &tail)) {
3044 bool ret = false;
3045 if (strcmp(tail, ":help") == 0) {
3046 fileStream stream(defaultStream::output_stream());
3047 LogConfiguration::print_command_line_help(&stream);
3048 vm_exit(0);
3049 } else if (strcmp(tail, ":disable") == 0) {
3050 LogConfiguration::disable_logging();
3051 ret = true;
3052 } else if (*tail == '\0') {
3053 ret = LogConfiguration::parse_command_line_arguments();
3054 assert(ret, "-Xlog without arguments should never fail to parse");
3055 } else if (*tail == ':') {
3056 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3057 }
3058 if (ret == false) {
3059 jio_fprintf(defaultStream::error_stream(),
3060 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
3061 tail);
3062 return JNI_EINVAL;
3063 }
3064 // JNI hooks
3065 } else if (match_option(option, "-Xcheck", &tail)) {
3066 if (!strcmp(tail, ":jni")) {
3067 #if !INCLUDE_JNI_CHECK
3068 warning("JNI CHECKING is not supported in this VM");
3069 #else
3070 CheckJNICalls = true;
3071 #endif // INCLUDE_JNI_CHECK
3072 } else if (is_bad_option(option, args->ignoreUnrecognized,
3073 "check")) {
3074 return JNI_EINVAL;
3075 }
3076 } else if (match_option(option, "vfprintf")) {
3077 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3078 } else if (match_option(option, "exit")) {
3079 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3080 } else if (match_option(option, "abort")) {
3081 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3082 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3083 // and the last option wins.
3084 } else if (match_option(option, "-XX:+NeverTenure")) {
3085 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3086 return JNI_EINVAL;
3087 }
3088 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3089 return JNI_EINVAL;
3090 }
3091 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3092 return JNI_EINVAL;
3093 }
3094 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3095 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3096 return JNI_EINVAL;
3097 }
3098 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3099 return JNI_EINVAL;
3100 }
3101 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3102 return JNI_EINVAL;
3103 }
3104 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3105 uintx max_tenuring_thresh = 0;
3106 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3107 jio_fprintf(defaultStream::error_stream(),
3108 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3109 return JNI_EINVAL;
3110 }
3111
3112 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3113 return JNI_EINVAL;
3114 }
3115
3116 if (MaxTenuringThreshold == 0) {
3117 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3118 return JNI_EINVAL;
3119 }
3120 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3121 return JNI_EINVAL;
3122 }
3123 } else {
3124 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3128 return JNI_EINVAL;
3129 }
3130 }
3131 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3132 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3133 return JNI_EINVAL;
3134 }
3135 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3139 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3140 return JNI_EINVAL;
3141 }
3142 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3146 #if defined(DTRACE_ENABLED)
3147 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3148 return JNI_EINVAL;
3149 }
3150 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3151 return JNI_EINVAL;
3152 }
3153 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3154 return JNI_EINVAL;
3155 }
3156 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 #else // defined(DTRACE_ENABLED)
3160 jio_fprintf(defaultStream::error_stream(),
3161 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3162 return JNI_EINVAL;
3163 #endif // defined(DTRACE_ENABLED)
3164 #ifdef ASSERT
3165 } else if (match_option(option, "-XX:+FullGCALot")) {
3166 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3167 return JNI_EINVAL;
3168 }
3169 // disable scavenge before parallel mark-compact
3170 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3171 return JNI_EINVAL;
3172 }
3173 #endif
3174 #if !INCLUDE_MANAGEMENT
3175 } else if (match_option(option, "-XX:+ManagementServer")) {
3176 jio_fprintf(defaultStream::error_stream(),
3177 "ManagementServer is not supported in this VM.\n");
3178 return JNI_ERR;
3179 #endif // INCLUDE_MANAGEMENT
3180 } else if (match_jfr_option(&option)) {
3181 return JNI_EINVAL;
3182 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3183 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3184 // already been handled
3185 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3186 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3187 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3188 return JNI_EINVAL;
3189 }
3190 }
3191 // Unknown option
3192 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3193 return JNI_ERR;
3194 }
3195 }
3196
3197 // PrintSharedArchiveAndExit will turn on
3198 // -Xshare:on
3199 // -Xlog:class+path=info
3200 if (PrintSharedArchiveAndExit) {
3201 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3205 return JNI_EINVAL;
3206 }
3207 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3208 }
3209
3210 // Change the default value for flags which have different default values
3211 // when working with older JDKs.
3212 #ifdef LINUX
3213 if (JDK_Version::current().compare_major(6) <= 0 &&
3214 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3215 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3216 }
3217 #endif // LINUX
3218 fix_appclasspath();
3219 return JNI_OK;
3220 }
3221
3222 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3223 // For java.base check for duplicate --patch-module options being specified on the command line.
3224 // This check is only required for java.base, all other duplicate module specifications
3225 // will be checked during module system initialization. The module system initialization
3226 // will throw an ExceptionInInitializerError if this situation occurs.
3227 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3228 if (*patch_mod_javabase) {
3229 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3230 } else {
3231 *patch_mod_javabase = true;
3232 }
3233 }
3234
3235 // Create GrowableArray lazily, only if --patch-module has been specified
3236 if (_patch_mod_prefix == NULL) {
3237 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3238 }
3239
3240 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3241 }
3242
3243 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3244 //
3245 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3246 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3247 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3248 // path is treated as the current directory.
3249 //
3250 // This causes problems with CDS, which requires that all directories specified in the classpath
3251 // must be empty. In most cases, applications do NOT want to load classes from the current
3252 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3253 // scripts compatible with CDS.
3254 void Arguments::fix_appclasspath() {
3255 if (IgnoreEmptyClassPaths) {
3256 const char separator = *os::path_separator();
3257 const char* src = _java_class_path->value();
3258
3259 // skip over all the leading empty paths
3260 while (*src == separator) {
3261 src ++;
3262 }
3263
3264 char* copy = os::strdup_check_oom(src, mtArguments);
3265
3266 // trim all trailing empty paths
3267 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3268 *tail = '\0';
3269 }
3270
3271 char from[3] = {separator, separator, '\0'};
3272 char to [2] = {separator, '\0'};
3273 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3274 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3275 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3276 }
3277
3278 _java_class_path->set_writeable_value(copy);
3279 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3280 }
3281 }
3282
3283 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3284 // check if the default lib/endorsed directory exists; if so, error
3285 char path[JVM_MAXPATHLEN];
3286 const char* fileSep = os::file_separator();
3287 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3288
3289 DIR* dir = os::opendir(path);
3290 if (dir != NULL) {
3291 jio_fprintf(defaultStream::output_stream(),
3292 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3293 "in modular form will be supported via the concept of upgradeable modules.\n");
3294 os::closedir(dir);
3295 return JNI_ERR;
3296 }
3297
3298 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3299 dir = os::opendir(path);
3300 if (dir != NULL) {
3301 jio_fprintf(defaultStream::output_stream(),
3302 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3303 "Use -classpath instead.\n.");
3304 os::closedir(dir);
3305 return JNI_ERR;
3306 }
3307
3308 // This must be done after all arguments have been processed
3309 // and the container support has been initialized since AggressiveHeap
3310 // relies on the amount of total memory available.
3311 if (AggressiveHeap) {
3312 jint result = set_aggressive_heap_flags();
3313 if (result != JNI_OK) {
3314 return result;
3315 }
3316 }
3317
3318 // This must be done after all arguments have been processed.
3319 // java_compiler() true means set to "NONE" or empty.
3320 if (java_compiler() && !xdebug_mode()) {
3321 // For backwards compatibility, we switch to interpreted mode if
3322 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3323 // not specified.
3324 set_mode_flags(_int);
3325 }
3326
3327 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3328 // but like -Xint, leave compilation thresholds unaffected.
3329 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3330 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3331 set_mode_flags(_int);
3332 }
3333
3334 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3335 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3336 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3337 }
3338
3339 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3340 // Don't degrade server performance for footprint
3341 if (FLAG_IS_DEFAULT(UseLargePages) &&
3342 MaxHeapSize < LargePageHeapSizeThreshold) {
3343 // No need for large granularity pages w/small heaps.
3344 // Note that large pages are enabled/disabled for both the
3345 // Java heap and the code cache.
3346 FLAG_SET_DEFAULT(UseLargePages, false);
3347 }
3348
3349 #elif defined(COMPILER2)
3350 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3351 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3352 }
3353 #endif
3354
3355 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3356 UNSUPPORTED_OPTION(ProfileInterpreter);
3357 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3358 #endif
3359
3360 #ifndef TIERED
3361 // Tiered compilation is undefined.
3362 UNSUPPORTED_OPTION(TieredCompilation);
3363 #endif
3364
3365 #if INCLUDE_JVMCI
3366 if (EnableJVMCI &&
3367 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3368 return JNI_ENOMEM;
3369 }
3370 #endif
3371
3372 if (!check_vm_args_consistency()) {
3373 return JNI_ERR;
3374 }
3375
3376 #if INCLUDE_JVMCI
3377 if (UseJVMCICompiler) {
3378 Compilation_mode = CompMode_server;
3379 }
3380 #endif
3381
3382 #if INCLUDE_CDS
3383 if (DumpSharedSpaces) {
3384 // Disable biased locking now as it interferes with the clean up of
3385 // the archived Klasses and Java string objects (at dump time only).
3386 UseBiasedLocking = false;
3387 }
3388 if (UseSharedSpaces && patch_mod_javabase) {
3389 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3390 }
3391 #endif
3392
3393 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3394 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3395 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3396
3397 return JNI_OK;
3398 }
3399
3400 // Helper class for controlling the lifetime of JavaVMInitArgs
3401 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3402 // deleted on the destruction of the ScopedVMInitArgs object.
3403 class ScopedVMInitArgs : public StackObj {
3404 private:
3405 JavaVMInitArgs _args;
3406 char* _container_name;
3407 bool _is_set;
3408 char* _vm_options_file_arg;
3409
3410 public:
3411 ScopedVMInitArgs(const char *container_name) {
3412 _args.version = JNI_VERSION_1_2;
3413 _args.nOptions = 0;
3414 _args.options = NULL;
3415 _args.ignoreUnrecognized = false;
3416 _container_name = (char *)container_name;
3417 _is_set = false;
3418 _vm_options_file_arg = NULL;
3419 }
3420
3421 // Populates the JavaVMInitArgs object represented by this
3422 // ScopedVMInitArgs object with the arguments in options. The
3423 // allocated memory is deleted by the destructor. If this method
3424 // returns anything other than JNI_OK, then this object is in a
3425 // partially constructed state, and should be abandoned.
3426 jint set_args(GrowableArray<JavaVMOption>* options) {
3427 _is_set = true;
3428 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3429 JavaVMOption, options->length(), mtArguments);
3430 if (options_arr == NULL) {
3431 return JNI_ENOMEM;
3432 }
3433 _args.options = options_arr;
3434
3435 for (int i = 0; i < options->length(); i++) {
3436 options_arr[i] = options->at(i);
3437 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3438 if (options_arr[i].optionString == NULL) {
3439 // Rely on the destructor to do cleanup.
3440 _args.nOptions = i;
3441 return JNI_ENOMEM;
3442 }
3443 }
3444
3445 _args.nOptions = options->length();
3446 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3447 return JNI_OK;
3448 }
3449
3450 JavaVMInitArgs* get() { return &_args; }
3451 char* container_name() { return _container_name; }
3452 bool is_set() { return _is_set; }
3453 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3454 char* vm_options_file_arg() { return _vm_options_file_arg; }
3455
3456 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3457 if (_vm_options_file_arg != NULL) {
3458 os::free(_vm_options_file_arg);
3459 }
3460 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3461 }
3462
3463 ~ScopedVMInitArgs() {
3464 if (_vm_options_file_arg != NULL) {
3465 os::free(_vm_options_file_arg);
3466 }
3467 if (_args.options == NULL) return;
3468 for (int i = 0; i < _args.nOptions; i++) {
3469 os::free(_args.options[i].optionString);
3470 }
3471 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3472 }
3473
3474 // Insert options into this option list, to replace option at
3475 // vm_options_file_pos (-XX:VMOptionsFile)
3476 jint insert(const JavaVMInitArgs* args,
3477 const JavaVMInitArgs* args_to_insert,
3478 const int vm_options_file_pos) {
3479 assert(_args.options == NULL, "shouldn't be set yet");
3480 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3481 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3482
3483 int length = args->nOptions + args_to_insert->nOptions - 1;
3484 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3485 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3486 for (int i = 0; i < args->nOptions; i++) {
3487 if (i == vm_options_file_pos) {
3488 // insert the new options starting at the same place as the
3489 // -XX:VMOptionsFile option
3490 for (int j = 0; j < args_to_insert->nOptions; j++) {
3491 options->push(args_to_insert->options[j]);
3492 }
3493 } else {
3494 options->push(args->options[i]);
3495 }
3496 }
3497 // make into options array
3498 jint result = set_args(options);
3499 delete options;
3500 return result;
3501 }
3502 };
3503
3504 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3505 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3506 }
3507
3508 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3509 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3510 }
3511
3512 jint Arguments::parse_options_environment_variable(const char* name,
3513 ScopedVMInitArgs* vm_args) {
3514 char *buffer = ::getenv(name);
3515
3516 // Don't check this environment variable if user has special privileges
3517 // (e.g. unix su command).
3518 if (buffer == NULL || os::have_special_privileges()) {
3519 return JNI_OK;
3520 }
3521
3522 if ((buffer = os::strdup(buffer)) == NULL) {
3523 return JNI_ENOMEM;
3524 }
3525
3526 jio_fprintf(defaultStream::error_stream(),
3527 "Picked up %s: %s\n", name, buffer);
3528
3529 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3530
3531 os::free(buffer);
3532 return retcode;
3533 }
3534
3535 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3536 // read file into buffer
3537 int fd = ::open(file_name, O_RDONLY);
3538 if (fd < 0) {
3539 jio_fprintf(defaultStream::error_stream(),
3540 "Could not open options file '%s'\n",
3541 file_name);
3542 return JNI_ERR;
3543 }
3544
3545 struct stat stbuf;
3546 int retcode = os::stat(file_name, &stbuf);
3547 if (retcode != 0) {
3548 jio_fprintf(defaultStream::error_stream(),
3549 "Could not stat options file '%s'\n",
3550 file_name);
3551 os::close(fd);
3552 return JNI_ERR;
3553 }
3554
3555 if (stbuf.st_size == 0) {
3556 // tell caller there is no option data and that is ok
3557 os::close(fd);
3558 return JNI_OK;
3559 }
3560
3561 // '+ 1' for NULL termination even with max bytes
3562 size_t bytes_alloc = stbuf.st_size + 1;
3563
3564 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3565 if (NULL == buf) {
3566 jio_fprintf(defaultStream::error_stream(),
3567 "Could not allocate read buffer for options file parse\n");
3568 os::close(fd);
3569 return JNI_ENOMEM;
3570 }
3571
3572 memset(buf, 0, bytes_alloc);
3573
3574 // Fill buffer
3575 // Use ::read() instead of os::read because os::read()
3576 // might do a thread state transition
3577 // and it is too early for that here
3578
3579 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3580 os::close(fd);
3581 if (bytes_read < 0) {
3582 FREE_C_HEAP_ARRAY(char, buf);
3583 jio_fprintf(defaultStream::error_stream(),
3584 "Could not read options file '%s'\n", file_name);
3585 return JNI_ERR;
3586 }
3587
3588 if (bytes_read == 0) {
3589 // tell caller there is no option data and that is ok
3590 FREE_C_HEAP_ARRAY(char, buf);
3591 return JNI_OK;
3592 }
3593
3594 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3595
3596 FREE_C_HEAP_ARRAY(char, buf);
3597 return retcode;
3598 }
3599
3600 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3601 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3602
3603 // some pointers to help with parsing
3604 char *buffer_end = buffer + buf_len;
3605 char *opt_hd = buffer;
3606 char *wrt = buffer;
3607 char *rd = buffer;
3608
3609 // parse all options
3610 while (rd < buffer_end) {
3611 // skip leading white space from the input string
3612 while (rd < buffer_end && isspace(*rd)) {
3613 rd++;
3614 }
3615
3616 if (rd >= buffer_end) {
3617 break;
3618 }
3619
3620 // Remember this is where we found the head of the token.
3621 opt_hd = wrt;
3622
3623 // Tokens are strings of non white space characters separated
3624 // by one or more white spaces.
3625 while (rd < buffer_end && !isspace(*rd)) {
3626 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3627 int quote = *rd; // matching quote to look for
3628 rd++; // don't copy open quote
3629 while (rd < buffer_end && *rd != quote) {
3630 // include everything (even spaces)
3631 // up until the close quote
3632 *wrt++ = *rd++; // copy to option string
3633 }
3634
3635 if (rd < buffer_end) {
3636 rd++; // don't copy close quote
3637 } else {
3638 // did not see closing quote
3639 jio_fprintf(defaultStream::error_stream(),
3640 "Unmatched quote in %s\n", name);
3641 delete options;
3642 return JNI_ERR;
3643 }
3644 } else {
3645 *wrt++ = *rd++; // copy to option string
3646 }
3647 }
3648
3649 // steal a white space character and set it to NULL
3650 *wrt++ = '\0';
3651 // We now have a complete token
3652
3653 JavaVMOption option;
3654 option.optionString = opt_hd;
3655 option.extraInfo = NULL;
3656
3657 options->append(option); // Fill in option
3658
3659 rd++; // Advance to next character
3660 }
3661
3662 // Fill out JavaVMInitArgs structure.
3663 jint status = vm_args->set_args(options);
3664
3665 delete options;
3666 return status;
3667 }
3668
3669 void Arguments::set_shared_spaces_flags() {
3670 if (DumpSharedSpaces) {
3671 if (FailOverToOldVerifier) {
3672 // Don't fall back to the old verifier on verification failure. If a
3673 // class fails verification with the split verifier, it might fail the
3674 // CDS runtime verifier constraint check. In that case, we don't want
3675 // to share the class. We only archive classes that pass the split verifier.
3676 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3677 }
3678
3679 if (RequireSharedSpaces) {
3680 warning("Cannot dump shared archive while using shared archive");
3681 }
3682 UseSharedSpaces = false;
3683 #ifdef _LP64
3684 if (!UseCompressedOops || !UseCompressedClassPointers) {
3685 vm_exit_during_initialization(
3686 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3687 }
3688 } else {
3689 if (!UseCompressedOops || !UseCompressedClassPointers) {
3690 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3691 }
3692 #endif
3693 }
3694 }
3695
3696 // Sharing support
3697 // Construct the path to the archive
3698 static char* get_shared_archive_path() {
3699 char *shared_archive_path;
3700 if (SharedArchiveFile == NULL) {
3701 char jvm_path[JVM_MAXPATHLEN];
3702 os::jvm_path(jvm_path, sizeof(jvm_path));
3703 char *end = strrchr(jvm_path, *os::file_separator());
3704 if (end != NULL) *end = '\0';
3705 size_t jvm_path_len = strlen(jvm_path);
3706 size_t file_sep_len = strlen(os::file_separator());
3707 const size_t len = jvm_path_len + file_sep_len + 20;
3708 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3709 if (shared_archive_path != NULL) {
3710 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3711 jvm_path, os::file_separator());
3712 }
3713 } else {
3714 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3715 }
3716 return shared_archive_path;
3717 }
3718
3719 #ifndef PRODUCT
3720 // Determine whether LogVMOutput should be implicitly turned on.
3721 static bool use_vm_log() {
3722 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3723 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3724 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3725 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3726 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3727 return true;
3728 }
3729
3730 #ifdef COMPILER1
3731 if (PrintC1Statistics) {
3732 return true;
3733 }
3734 #endif // COMPILER1
3735
3736 #ifdef COMPILER2
3737 if (PrintOptoAssembly || PrintOptoStatistics) {
3738 return true;
3739 }
3740 #endif // COMPILER2
3741
3742 return false;
3743 }
3744
3745 #endif // PRODUCT
3746
3747 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3748 for (int index = 0; index < args->nOptions; index++) {
3749 const JavaVMOption* option = args->options + index;
3750 const char* tail;
3751 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3752 return true;
3753 }
3754 }
3755 return false;
3756 }
3757
3758 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3759 const char* vm_options_file,
3760 const int vm_options_file_pos,
3761 ScopedVMInitArgs* vm_options_file_args,
3762 ScopedVMInitArgs* args_out) {
3763 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3764 if (code != JNI_OK) {
3765 return code;
3766 }
3767
3768 if (vm_options_file_args->get()->nOptions < 1) {
3769 return JNI_OK;
3770 }
3771
3772 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3773 jio_fprintf(defaultStream::error_stream(),
3774 "A VM options file may not refer to a VM options file. "
3775 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3776 "options file '%s' in options container '%s' is an error.\n",
3777 vm_options_file_args->vm_options_file_arg(),
3778 vm_options_file_args->container_name());
3779 return JNI_EINVAL;
3780 }
3781
3782 return args_out->insert(args, vm_options_file_args->get(),
3783 vm_options_file_pos);
3784 }
3785
3786 // Expand -XX:VMOptionsFile found in args_in as needed.
3787 // mod_args and args_out parameters may return values as needed.
3788 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3789 ScopedVMInitArgs* mod_args,
3790 JavaVMInitArgs** args_out) {
3791 jint code = match_special_option_and_act(args_in, mod_args);
3792 if (code != JNI_OK) {
3793 return code;
3794 }
3795
3796 if (mod_args->is_set()) {
3797 // args_in contains -XX:VMOptionsFile and mod_args contains the
3798 // original options from args_in along with the options expanded
3799 // from the VMOptionsFile. Return a short-hand to the caller.
3800 *args_out = mod_args->get();
3801 } else {
3802 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3803 }
3804 return JNI_OK;
3805 }
3806
3807 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3808 ScopedVMInitArgs* args_out) {
3809 // Remaining part of option string
3810 const char* tail;
3811 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3812
3813 for (int index = 0; index < args->nOptions; index++) {
3814 const JavaVMOption* option = args->options + index;
3815 if (ArgumentsExt::process_options(option)) {
3816 continue;
3817 }
3818 if (match_option(option, "-XX:Flags=", &tail)) {
3819 Arguments::set_jvm_flags_file(tail);
3820 continue;
3821 }
3822 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3823 if (vm_options_file_args.found_vm_options_file_arg()) {
3824 jio_fprintf(defaultStream::error_stream(),
3825 "The option '%s' is already specified in the options "
3826 "container '%s' so the specification of '%s' in the "
3827 "same options container is an error.\n",
3828 vm_options_file_args.vm_options_file_arg(),
3829 vm_options_file_args.container_name(),
3830 option->optionString);
3831 return JNI_EINVAL;
3832 }
3833 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3834 // If there's a VMOptionsFile, parse that
3835 jint code = insert_vm_options_file(args, tail, index,
3836 &vm_options_file_args, args_out);
3837 if (code != JNI_OK) {
3838 return code;
3839 }
3840 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3841 if (args_out->is_set()) {
3842 // The VMOptions file inserted some options so switch 'args'
3843 // to the new set of options, and continue processing which
3844 // preserves "last option wins" semantics.
3845 args = args_out->get();
3846 // The first option from the VMOptionsFile replaces the
3847 // current option. So we back track to process the
3848 // replacement option.
3849 index--;
3850 }
3851 continue;
3852 }
3853 if (match_option(option, "-XX:+PrintVMOptions")) {
3854 PrintVMOptions = true;
3855 continue;
3856 }
3857 if (match_option(option, "-XX:-PrintVMOptions")) {
3858 PrintVMOptions = false;
3859 continue;
3860 }
3861 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3862 IgnoreUnrecognizedVMOptions = true;
3863 continue;
3864 }
3865 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3866 IgnoreUnrecognizedVMOptions = false;
3867 continue;
3868 }
3869 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3870 CommandLineFlags::printFlags(tty, false);
3871 vm_exit(0);
3872 }
3873 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3874 #if INCLUDE_NMT
3875 // The launcher did not setup nmt environment variable properly.
3876 if (!MemTracker::check_launcher_nmt_support(tail)) {
3877 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3878 }
3879
3880 // Verify if nmt option is valid.
3881 if (MemTracker::verify_nmt_option()) {
3882 // Late initialization, still in single-threaded mode.
3883 if (MemTracker::tracking_level() >= NMT_summary) {
3884 MemTracker::init();
3885 }
3886 } else {
3887 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3888 }
3889 continue;
3890 #else
3891 jio_fprintf(defaultStream::error_stream(),
3892 "Native Memory Tracking is not supported in this VM\n");
3893 return JNI_ERR;
3894 #endif
3895 }
3896
3897 #ifndef PRODUCT
3898 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3899 CommandLineFlags::printFlags(tty, true);
3900 vm_exit(0);
3901 }
3902 #endif
3903
3904 if (match_option(option, "-XX:+UseAppCDS")) {
3905 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
3906 if (flag->is_diagnostic()) {
3907 flag->clear_diagnostic();
3908 }
3909 continue;
3910 }
3911 }
3912 return JNI_OK;
3913 }
3914
3915 static void print_options(const JavaVMInitArgs *args) {
3916 const char* tail;
3917 for (int index = 0; index < args->nOptions; index++) {
3918 const JavaVMOption *option = args->options + index;
3919 if (match_option(option, "-XX:", &tail)) {
3920 logOption(tail);
3921 }
3922 }
3923 }
3924
3925 bool Arguments::handle_deprecated_print_gc_flags() {
3926 if (PrintGC) {
3927 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3928 }
3929 if (PrintGCDetails) {
3930 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3931 }
3932
3933 if (_gc_log_filename != NULL) {
3934 // -Xloggc was used to specify a filename
3935 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3936
3937 LogTarget(Error, logging) target;
3938 LogStream errstream(target);
3939 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3940 } else if (PrintGC || PrintGCDetails) {
3941 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3942 }
3943 return true;
3944 }
3945
3946 void Arguments::handle_extra_cms_flags(const char* msg) {
3947 SpecialFlag flag;
3948 const char *flag_name = "UseConcMarkSweepGC";
3949 if (lookup_special_flag(flag_name, flag)) {
3950 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3951 warning("%s", msg);
3952 }
3953 }
3954
3955 // Parse entry point called from JNI_CreateJavaVM
3956
3957 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3958 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3959
3960 // Initialize ranges, constraints and writeables
3961 CommandLineFlagRangeList::init();
3962 CommandLineFlagConstraintList::init();
3963 CommandLineFlagWriteableList::init();
3964
3965 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3966 const char* hotspotrc = ".hotspotrc";
3967 bool settings_file_specified = false;
3968 bool needs_hotspotrc_warning = false;
3969 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3970 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3971
3972 // Pointers to current working set of containers
3973 JavaVMInitArgs* cur_cmd_args;
3974 JavaVMInitArgs* cur_java_options_args;
3975 JavaVMInitArgs* cur_java_tool_options_args;
3976
3977 // Containers for modified/expanded options
3978 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3979 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3980 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3981
3982
3983 jint code =
3984 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3985 if (code != JNI_OK) {
3986 return code;
3987 }
3988
3989 code = parse_java_options_environment_variable(&initial_java_options_args);
3990 if (code != JNI_OK) {
3991 return code;
3992 }
3993
3994 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3995 &mod_java_tool_options_args,
3996 &cur_java_tool_options_args);
3997 if (code != JNI_OK) {
3998 return code;
3999 }
4000
4001 code = expand_vm_options_as_needed(initial_cmd_args,
4002 &mod_cmd_args,
4003 &cur_cmd_args);
4004 if (code != JNI_OK) {
4005 return code;
4006 }
4007
4008 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4009 &mod_java_options_args,
4010 &cur_java_options_args);
4011 if (code != JNI_OK) {
4012 return code;
4013 }
4014
4015 const char* flags_file = Arguments::get_jvm_flags_file();
4016 settings_file_specified = (flags_file != NULL);
4017
4018 if (IgnoreUnrecognizedVMOptions) {
4019 cur_cmd_args->ignoreUnrecognized = true;
4020 cur_java_tool_options_args->ignoreUnrecognized = true;
4021 cur_java_options_args->ignoreUnrecognized = true;
4022 }
4023
4024 // Parse specified settings file
4025 if (settings_file_specified) {
4026 if (!process_settings_file(flags_file, true,
4027 cur_cmd_args->ignoreUnrecognized)) {
4028 return JNI_EINVAL;
4029 }
4030 } else {
4031 #ifdef ASSERT
4032 // Parse default .hotspotrc settings file
4033 if (!process_settings_file(".hotspotrc", false,
4034 cur_cmd_args->ignoreUnrecognized)) {
4035 return JNI_EINVAL;
4036 }
4037 #else
4038 struct stat buf;
4039 if (os::stat(hotspotrc, &buf) == 0) {
4040 needs_hotspotrc_warning = true;
4041 }
4042 #endif
4043 }
4044
4045 if (PrintVMOptions) {
4046 print_options(cur_java_tool_options_args);
4047 print_options(cur_cmd_args);
4048 print_options(cur_java_options_args);
4049 }
4050
4051 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4052 jint result = parse_vm_init_args(cur_java_tool_options_args,
4053 cur_java_options_args,
4054 cur_cmd_args);
4055
4056 if (result != JNI_OK) {
4057 return result;
4058 }
4059
4060 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4061 SharedArchivePath = get_shared_archive_path();
4062 if (SharedArchivePath == NULL) {
4063 return JNI_ENOMEM;
4064 }
4065
4066 // Set up VerifySharedSpaces
4067 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4068 VerifySharedSpaces = true;
4069 }
4070
4071 // Delay warning until here so that we've had a chance to process
4072 // the -XX:-PrintWarnings flag
4073 if (needs_hotspotrc_warning) {
4074 warning("%s file is present but has been ignored. "
4075 "Run with -XX:Flags=%s to load the file.",
4076 hotspotrc, hotspotrc);
4077 }
4078
4079 if (needs_module_property_warning) {
4080 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4081 " names that are reserved for internal use.");
4082 }
4083
4084 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4085 UNSUPPORTED_OPTION(UseLargePages);
4086 #endif
4087
4088 ArgumentsExt::report_unsupported_options();
4089
4090 #ifndef PRODUCT
4091 if (TraceBytecodesAt != 0) {
4092 TraceBytecodes = true;
4093 }
4094 if (CountCompiledCalls) {
4095 if (UseCounterDecay) {
4096 warning("UseCounterDecay disabled because CountCalls is set");
4097 UseCounterDecay = false;
4098 }
4099 }
4100 #endif // PRODUCT
4101
4102 if (ScavengeRootsInCode == 0) {
4103 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4104 warning("Forcing ScavengeRootsInCode non-zero");
4105 }
4106 ScavengeRootsInCode = 1;
4107 }
4108
4109 if (!handle_deprecated_print_gc_flags()) {
4110 return JNI_EINVAL;
4111 }
4112
4113 // Set object alignment values.
4114 set_object_alignment();
4115
4116 #if !INCLUDE_CDS
4117 if (DumpSharedSpaces || RequireSharedSpaces) {
4118 jio_fprintf(defaultStream::error_stream(),
4119 "Shared spaces are not supported in this VM\n");
4120 return JNI_ERR;
4121 }
4122 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4123 log_is_enabled(Info, cds)) {
4124 warning("Shared spaces are not supported in this VM");
4125 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4126 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4127 }
4128 no_shared_spaces("CDS Disabled");
4129 #endif // INCLUDE_CDS
4130
4131 return JNI_OK;
4132 }
4133
4134 jint Arguments::apply_ergo() {
4135 // Set flags based on ergonomics.
4136 jint result = set_ergonomics_flags();
4137 if (result != JNI_OK) return result;
4138
4139 #if INCLUDE_JVMCI
4140 set_jvmci_specific_flags();
4141 #endif
4142
4143 set_shared_spaces_flags();
4144
4145 if (TieredCompilation) {
4146 set_tiered_flags();
4147 } else {
4148 int max_compilation_policy_choice = 1;
4149 #ifdef COMPILER2
4150 if (is_server_compilation_mode_vm()) {
4151 max_compilation_policy_choice = 2;
4152 }
4153 #endif
4154 // Check if the policy is valid.
4155 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4156 vm_exit_during_initialization(
4157 "Incompatible compilation policy selected", NULL);
4158 }
4159 // Scale CompileThreshold
4160 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4161 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4162 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4163 }
4164 }
4165
4166 #ifdef COMPILER2
4167 #ifndef PRODUCT
4168 if (PrintIdealGraphLevel > 0) {
4169 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4170 }
4171 #endif
4172 #endif
4173
4174 // Set heap size based on available physical memory
4175 set_heap_size();
4176
4177 GCConfig::arguments()->initialize();
4178
4179 // Initialize Metaspace flags and alignments
4180 Metaspace::ergo_initialize();
4181
4182 // Set bytecode rewriting flags
4183 set_bytecode_flags();
4184
4185 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4186 jint code = set_aggressive_opts_flags();
4187 if (code != JNI_OK) {
4188 return code;
4189 }
4190
4191 // Turn off biased locking for locking debug mode flags,
4192 // which are subtly different from each other but neither works with
4193 // biased locking
4194 if (UseHeavyMonitors
4195 #ifdef COMPILER1
4196 || !UseFastLocking
4197 #endif // COMPILER1
4198 #if INCLUDE_JVMCI
4199 || !JVMCIUseFastLocking
4200 #endif
4201 ) {
4202 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4203 // flag set to true on command line; warn the user that they
4204 // can't enable biased locking here
4205 warning("Biased Locking is not supported with locking debug flags"
4206 "; ignoring UseBiasedLocking flag." );
4207 }
4208 UseBiasedLocking = false;
4209 }
4210
4211 #ifdef CC_INTERP
4212 // Clear flags not supported on zero.
4213 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4214 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4215 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4216 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4217 #endif // CC_INTERP
4218
4219 #ifdef COMPILER2
4220 if (!EliminateLocks) {
4221 EliminateNestedLocks = false;
4222 }
4223 if (!Inline) {
4224 IncrementalInline = false;
4225 }
4226 #ifndef PRODUCT
4227 if (!IncrementalInline) {
4228 AlwaysIncrementalInline = false;
4229 }
4230 #endif
4231 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4232 // nothing to use the profiling, turn if off
4233 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4234 }
4235 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
4236 // blind guess
4237 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
4238 }
4239 #endif
4240
4241 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4242 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4243 DebugNonSafepoints = true;
4244 }
4245
4246 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4247 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4248 }
4249
4250 if (UseOnStackReplacement && !UseLoopCounter) {
4251 warning("On-stack-replacement requires loop counters; enabling loop counters");
4252 FLAG_SET_DEFAULT(UseLoopCounter, true);
4253 }
4254
4255 #ifndef PRODUCT
4256 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4257 if (use_vm_log()) {
4258 LogVMOutput = true;
4259 }
4260 }
4261 #endif // PRODUCT
4262
4263 if (PrintCommandLineFlags) {
4264 CommandLineFlags::printSetFlags(tty);
4265 }
4266
4267 // Apply CPU specific policy for the BiasedLocking
4268 if (UseBiasedLocking) {
4269 if (!VM_Version::use_biased_locking() &&
4270 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4271 UseBiasedLocking = false;
4272 }
4273 }
4274 #ifdef COMPILER2
4275 if (!UseBiasedLocking || EmitSync != 0) {
4276 UseOptoBiasInlining = false;
4277 }
4278 #endif
4279
4280 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4281 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4282 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4283 } else {
4284 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4285 }
4286
4287 return JNI_OK;
4288 }
4289
4290 jint Arguments::adjust_after_os() {
4291 if (UseNUMA) {
4292 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4293 FLAG_SET_ERGO(bool, UseNUMA, false);
4294 } else if (UseParallelGC || UseParallelOldGC) {
4295 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4296 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4297 }
4298 }
4299 // UseNUMAInterleaving is set to ON for all collectors and
4300 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4301 // such as the parallel collector for Linux and Solaris will
4302 // interleave old gen and survivor spaces on top of NUMA
4303 // allocation policy for the eden space.
4304 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4305 // all platforms and ParallelGC on Windows will interleave all
4306 // of the heap spaces across NUMA nodes.
4307 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4308 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4309 }
4310 }
4311 return JNI_OK;
4312 }
4313
4314 int Arguments::PropertyList_count(SystemProperty* pl) {
4315 int count = 0;
4316 while(pl != NULL) {
4317 count++;
4318 pl = pl->next();
4319 }
4320 return count;
4321 }
4322
4323 // Return the number of readable properties.
4324 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4325 int count = 0;
4326 while(pl != NULL) {
4327 if (pl->is_readable()) {
4328 count++;
4329 }
4330 pl = pl->next();
4331 }
4332 return count;
4333 }
4334
4335 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4336 assert(key != NULL, "just checking");
4337 SystemProperty* prop;
4338 for (prop = pl; prop != NULL; prop = prop->next()) {
4339 if (strcmp(key, prop->key()) == 0) return prop->value();
4340 }
4341 return NULL;
4342 }
4343
4344 // Return the value of the requested property provided that it is a readable property.
4345 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4346 assert(key != NULL, "just checking");
4347 SystemProperty* prop;
4348 // Return the property value if the keys match and the property is not internal or
4349 // it's the special internal property "jdk.boot.class.path.append".
4350 for (prop = pl; prop != NULL; prop = prop->next()) {
4351 if (strcmp(key, prop->key()) == 0) {
4352 if (!prop->internal()) {
4353 return prop->value();
4354 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4355 return prop->value();
4356 } else {
4357 // Property is internal and not jdk.boot.class.path.append so return NULL.
4358 return NULL;
4359 }
4360 }
4361 }
4362 return NULL;
4363 }
4364
4365 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4366 int count = 0;
4367 const char* ret_val = NULL;
4368
4369 while(pl != NULL) {
4370 if(count >= index) {
4371 ret_val = pl->key();
4372 break;
4373 }
4374 count++;
4375 pl = pl->next();
4376 }
4377
4378 return ret_val;
4379 }
4380
4381 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4382 int count = 0;
4383 char* ret_val = NULL;
4384
4385 while(pl != NULL) {
4386 if(count >= index) {
4387 ret_val = pl->value();
4388 break;
4389 }
4390 count++;
4391 pl = pl->next();
4392 }
4393
4394 return ret_val;
4395 }
4396
4397 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4398 SystemProperty* p = *plist;
4399 if (p == NULL) {
4400 *plist = new_p;
4401 } else {
4402 while (p->next() != NULL) {
4403 p = p->next();
4404 }
4405 p->set_next(new_p);
4406 }
4407 }
4408
4409 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4410 bool writeable, bool internal) {
4411 if (plist == NULL)
4412 return;
4413
4414 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4415 PropertyList_add(plist, new_p);
4416 }
4417
4418 void Arguments::PropertyList_add(SystemProperty *element) {
4419 PropertyList_add(&_system_properties, element);
4420 }
4421
4422 // This add maintains unique property key in the list.
4423 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4424 PropertyAppendable append, PropertyWriteable writeable,
4425 PropertyInternal internal) {
4426 if (plist == NULL)
4427 return;
4428
4429 // If property key exist then update with new value.
4430 SystemProperty* prop;
4431 for (prop = *plist; prop != NULL; prop = prop->next()) {
4432 if (strcmp(k, prop->key()) == 0) {
4433 if (append == AppendProperty) {
4434 prop->append_value(v);
4435 } else {
4436 prop->set_value(v);
4437 }
4438 return;
4439 }
4440 }
4441
4442 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4443 }
4444
4445 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4446 // Returns true if all of the source pointed by src has been copied over to
4447 // the destination buffer pointed by buf. Otherwise, returns false.
4448 // Notes:
4449 // 1. If the length (buflen) of the destination buffer excluding the
4450 // NULL terminator character is not long enough for holding the expanded
4451 // pid characters, it also returns false instead of returning the partially
4452 // expanded one.
4453 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4454 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4455 char* buf, size_t buflen) {
4456 const char* p = src;
4457 char* b = buf;
4458 const char* src_end = &src[srclen];
4459 char* buf_end = &buf[buflen - 1];
4460
4461 while (p < src_end && b < buf_end) {
4462 if (*p == '%') {
4463 switch (*(++p)) {
4464 case '%': // "%%" ==> "%"
4465 *b++ = *p++;
4466 break;
4467 case 'p': { // "%p" ==> current process id
4468 // buf_end points to the character before the last character so
4469 // that we could write '\0' to the end of the buffer.
4470 size_t buf_sz = buf_end - b + 1;
4471 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4472
4473 // if jio_snprintf fails or the buffer is not long enough to hold
4474 // the expanded pid, returns false.
4475 if (ret < 0 || ret >= (int)buf_sz) {
4476 return false;
4477 } else {
4478 b += ret;
4479 assert(*b == '\0', "fail in copy_expand_pid");
4480 if (p == src_end && b == buf_end + 1) {
4481 // reach the end of the buffer.
4482 return true;
4483 }
4484 }
4485 p++;
4486 break;
4487 }
4488 default :
4489 *b++ = '%';
4490 }
4491 } else {
4492 *b++ = *p++;
4493 }
4494 }
4495 *b = '\0';
4496 return (p == src_end); // return false if not all of the source was copied
4497 }