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/gcArguments.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "logging/logStream.hpp"
39 #include "logging/logTag.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.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 static void logOption(const char* opt) {
267 if (PrintVMOptions) {
268 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
269 }
270 }
271
272 bool needs_module_property_warning = false;
273
274 #define MODULE_PROPERTY_PREFIX "jdk.module."
275 #define MODULE_PROPERTY_PREFIX_LEN 11
276 #define ADDEXPORTS "addexports"
277 #define ADDEXPORTS_LEN 10
278 #define ADDREADS "addreads"
279 #define ADDREADS_LEN 8
280 #define ADDOPENS "addopens"
281 #define ADDOPENS_LEN 8
282 #define PATCH "patch"
283 #define PATCH_LEN 5
284 #define ADDMODS "addmods"
285 #define ADDMODS_LEN 7
286 #define LIMITMODS "limitmods"
287 #define LIMITMODS_LEN 9
288 #define PATH "path"
289 #define PATH_LEN 4
290 #define UPGRADE_PATH "upgrade.path"
291 #define UPGRADE_PATH_LEN 12
292
293 void Arguments::add_init_library(const char* name, char* options) {
294 _libraryList.add(new AgentLibrary(name, options, false, NULL));
295 }
296
297 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
298 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
299 }
300
301 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
302 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
303 }
304
305 // Late-binding agents not started via arguments
306 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
307 _agentList.add(agentLib);
308 }
309
310 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
311 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
312 }
313
314 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
315 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
316 return ((strncmp(option, property, len) == 0) &&
317 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
318 }
319
320 // Return true if property starts with "jdk.module." and its ensuing chars match
321 // any of the reserved module properties.
322 // property should be passed without the leading "-D".
323 bool Arguments::is_internal_module_property(const char* property) {
324 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
325 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
326 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
327 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
328 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
329 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
330 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
331 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
332 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
333 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
334 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
335 return true;
336 }
337 }
338 return false;
339 }
340
341 // Process java launcher properties.
342 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
343 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
344 // sun.java.launcher.pid is defined.
345 // Must do this before setting up other system properties,
346 // as some of them may depend on launcher type.
347 for (int index = 0; index < args->nOptions; index++) {
348 const JavaVMOption* option = args->options + index;
349 const char* tail;
350
351 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
352 process_java_launcher_argument(tail, option->extraInfo);
353 continue;
354 }
355 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
356 if (strcmp(tail, "true") == 0) {
357 _sun_java_launcher_is_altjvm = true;
358 }
359 continue;
360 }
361 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
362 _sun_java_launcher_pid = atoi(tail);
363 continue;
364 }
365 }
366 }
367
368 // Initialize system properties key and value.
369 void Arguments::init_system_properties() {
370
371 // Set up _system_boot_class_path which is not a property but
372 // relies heavily on argument processing and the jdk.boot.class.path.append
373 // property. It is used to store the underlying system boot class path.
374 _system_boot_class_path = new PathString(NULL);
375
376 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
377 "Java Virtual Machine Specification", false));
378 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
379 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
380 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
381 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
382
383 // Following are JVMTI agent writable properties.
384 // Properties values are set to NULL and they are
385 // os specific they are initialized in os::init_system_properties_values().
386 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
387 _java_library_path = new SystemProperty("java.library.path", NULL, true);
388 _java_home = new SystemProperty("java.home", NULL, true);
389 _java_class_path = new SystemProperty("java.class.path", "", true);
390 // jdk.boot.class.path.append is a non-writeable, internal property.
391 // It can only be set by either:
392 // - -Xbootclasspath/a:
393 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
394 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
395
396 // Add to System Property list.
397 PropertyList_add(&_system_properties, _sun_boot_library_path);
398 PropertyList_add(&_system_properties, _java_library_path);
399 PropertyList_add(&_system_properties, _java_home);
400 PropertyList_add(&_system_properties, _java_class_path);
401 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
402
403 // Set OS specific system properties values
404 os::init_system_properties_values();
405 }
406
407 // Update/Initialize System properties after JDK version number is known
408 void Arguments::init_version_specific_system_properties() {
409 enum { bufsz = 16 };
410 char buffer[bufsz];
411 const char* spec_vendor = "Oracle Corporation";
412 uint32_t spec_version = JDK_Version::current().major_version();
413
414 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
415
416 PropertyList_add(&_system_properties,
417 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
418 PropertyList_add(&_system_properties,
419 new SystemProperty("java.vm.specification.version", buffer, false));
420 PropertyList_add(&_system_properties,
421 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
422 }
423
424 /*
425 * -XX argument processing:
426 *
427 * -XX arguments are defined in several places, such as:
428 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
429 * -XX arguments are parsed in parse_argument().
430 * -XX argument bounds checking is done in check_vm_args_consistency().
431 *
432 * Over time -XX arguments may change. There are mechanisms to handle common cases:
433 *
434 * ALIASED: An option that is simply another name for another option. This is often
435 * part of the process of deprecating a flag, but not all aliases need
436 * to be deprecated.
437 *
438 * Create an alias for an option by adding the old and new option names to the
439 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
440 *
441 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
442 * support may be removed in the future. Both regular and aliased options may be
443 * deprecated.
444 *
445 * Add a deprecation warning for an option (or alias) by adding an entry in the
446 * "special_jvm_flags" table and setting the "deprecated_in" field.
447 * Often an option "deprecated" in one major release will
448 * be made "obsolete" in the next. In this case the entry should also have its
449 * "obsolete_in" field set.
450 *
451 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
452 * on the command line. A warning is printed to let the user know that option might not
453 * be accepted in the future.
454 *
455 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
456 * table and setting the "obsolete_in" field.
457 *
458 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
459 * to the current JDK version. The system will flatly refuse to admit the existence of
460 * the flag. This allows a flag to die automatically over JDK releases.
461 *
462 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
463 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
464 * - Newly obsolete or expired deprecated options should have their global variable
465 * definitions removed (from globals.hpp, etc) and related implementations removed.
466 *
467 * Recommended approach for removing options:
468 *
469 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
470 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
471 *
472 * To remove internal options (e.g. diagnostic, experimental, develop options), use
473 * a 2-step model adding major release numbers to the obsolete and expire columns.
474 *
475 * To change the name of an option, use the alias table as well as a 2-step
476 * model adding major release numbers to the deprecate and expire columns.
477 * Think twice about aliasing commonly used customer options.
478 *
479 * There are times when it is appropriate to leave a future release number as undefined.
480 *
481 * Tests: Aliases should be tested in VMAliasOptions.java.
482 * Deprecated options should be tested in VMDeprecatedOptions.java.
483 */
484
485 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
486 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
487 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
488 // the command-line as usual, but will issue a warning.
489 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
490 // the command-line, while issuing a warning and ignoring the flag value.
491 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
492 // existence of the flag.
493 //
494 // MANUAL CLEANUP ON JDK VERSION UPDATES:
495 // This table ensures that the handling of options will update automatically when the JDK
496 // version is incremented, but the source code needs to be cleanup up manually:
497 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
498 // variable should be removed, as well as users of the variable.
499 // - As "deprecated" options age into "obsolete" options, move the entry into the
500 // "Obsolete Flags" section of the table.
501 // - All expired options should be removed from the table.
502 static SpecialFlag const special_jvm_flags[] = {
503 // -------------- Deprecated Flags --------------
504 // --- Non-alias flags - sorted by obsolete_in then expired_in:
505 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
506 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
507 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
508 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
509 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
511 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
512 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
515 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
516 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
517 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
518 { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
519 { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
520 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
521
522 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
523 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
526 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
527
528 // -------------- Obsolete Flags - sorted by expired_in --------------
529 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
530 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
531 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
532 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
533 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
534 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
535 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
536 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
537 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
538 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
539 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
540 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
541 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
542 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
543 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
544 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
545 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
546 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
547
548 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
549 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
550 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
551 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
552 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
553 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
554 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
555 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
556 #endif
557
558 { NULL, JDK_Version(0), JDK_Version(0) }
559 };
560
561 // Flags that are aliases for other flags.
562 typedef struct {
563 const char* alias_name;
564 const char* real_name;
565 } AliasedFlag;
566
567 static AliasedFlag const aliased_jvm_flags[] = {
568 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
569 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
570 { NULL, NULL}
571 };
572
573 // NOTE: A compatibility request will be necessary for each alias to be removed.
574 static AliasedLoggingFlag const aliased_logging_flags[] = {
575 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
576 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
577 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
578 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
579 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
580 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
581 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
582 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
583 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
584 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
585 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
586 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
587 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
588 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
589 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
590 };
591
592 #ifndef PRODUCT
593 // These options are removed in jdk9. Remove this code for jdk10.
594 static AliasedFlag const removed_develop_logging_flags[] = {
595 { "TraceClassInitialization", "-Xlog:class+init" },
596 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
597 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
598 { "TraceItables", "-Xlog:itables=debug" },
599 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
600 { "TraceSafepoint", "-Xlog:safepoint=debug" },
601 { "TraceStartupTime", "-Xlog:startuptime" },
602 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
603 { "PrintVtables", "-Xlog:vtables=debug" },
604 { "VerboseVerification", "-Xlog:verification" },
605 { NULL, NULL }
606 };
607 #endif //PRODUCT
608
609 // Return true if "v" is less than "other", where "other" may be "undefined".
610 static bool version_less_than(JDK_Version v, JDK_Version other) {
611 assert(!v.is_undefined(), "must be defined");
612 if (!other.is_undefined() && v.compare(other) >= 0) {
613 return false;
614 } else {
615 return true;
616 }
617 }
618
619 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
620
621 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
622 // Allow extensions to have priority
623 if (lookup_special_flag_ext(flag_name, flag)) {
624 return true;
625 }
626
627 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
628 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
629 flag = special_jvm_flags[i];
630 return true;
631 }
632 }
633 return false;
634 }
635
636 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
637 assert(version != NULL, "Must provide a version buffer");
638 SpecialFlag flag;
639 if (lookup_special_flag(flag_name, flag)) {
640 if (!flag.obsolete_in.is_undefined()) {
641 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
642 *version = flag.obsolete_in;
643 return true;
644 }
645 }
646 }
647 return false;
648 }
649
650 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
651 assert(version != NULL, "Must provide a version buffer");
652 SpecialFlag flag;
653 if (lookup_special_flag(flag_name, flag)) {
654 if (!flag.deprecated_in.is_undefined()) {
655 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
656 version_less_than(JDK_Version::current(), flag.expired_in)) {
657 *version = flag.deprecated_in;
658 return 1;
659 } else {
660 return -1;
661 }
662 }
663 }
664 return 0;
665 }
666
667 #ifndef PRODUCT
668 const char* Arguments::removed_develop_logging_flag_name(const char* name){
669 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
670 const AliasedFlag& flag = removed_develop_logging_flags[i];
671 if (strcmp(flag.alias_name, name) == 0) {
672 return flag.real_name;
673 }
674 }
675 return NULL;
676 }
677 #endif // PRODUCT
678
679 const char* Arguments::real_flag_name(const char *flag_name) {
680 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
681 const AliasedFlag& flag_status = aliased_jvm_flags[i];
682 if (strcmp(flag_status.alias_name, flag_name) == 0) {
683 return flag_status.real_name;
684 }
685 }
686 return flag_name;
687 }
688
689 #ifdef ASSERT
690 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
691 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
692 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
693 return true;
694 }
695 }
696 return false;
697 }
698
699 // Verifies the correctness of the entries in the special_jvm_flags table.
700 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
701 // version being earlier than the deprecation version, then a warning is issued
702 // and verification fails - by returning false. If it is detected that the table
703 // is out of date, with respect to the current version, then a warning is issued
704 // but verification does not fail. This allows the VM to operate when the version
705 // is first updated, without needing to update all the impacted flags at the
706 // same time.
707 static bool verify_special_jvm_flags() {
708 bool success = true;
709 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
710 const SpecialFlag& flag = special_jvm_flags[i];
711 if (lookup_special_flag(flag.name, i)) {
712 warning("Duplicate special flag declaration \"%s\"", flag.name);
713 success = false;
714 }
715 if (flag.deprecated_in.is_undefined() &&
716 flag.obsolete_in.is_undefined()) {
717 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
718 success = false;
719 }
720
721 if (!flag.deprecated_in.is_undefined()) {
722 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
723 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
724 success = false;
725 }
726
727 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
728 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
729 success = false;
730 }
731 }
732
733 if (!flag.obsolete_in.is_undefined()) {
734 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
735 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
736 success = false;
737 }
738
739 // if flag has become obsolete it should not have a "globals" flag defined anymore.
740 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
741 if (Flag::find_flag(flag.name) != NULL) {
742 // Temporarily disable the warning: 8196739
743 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
744 }
745 }
746 }
747
748 if (!flag.expired_in.is_undefined()) {
749 // if flag has become expired it should not have a "globals" flag defined anymore.
750 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
751 if (Flag::find_flag(flag.name) != NULL) {
752 // Temporarily disable the warning: 8196739
753 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
754 }
755 }
756 }
757
758 }
759 return success;
760 }
761 #endif
762
763 // Parses a size specification string.
764 bool Arguments::atojulong(const char *s, julong* result) {
765 julong n = 0;
766
767 // First char must be a digit. Don't allow negative numbers or leading spaces.
768 if (!isdigit(*s)) {
769 return false;
770 }
771
772 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
773 char* remainder;
774 errno = 0;
775 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
776 if (errno != 0) {
777 return false;
778 }
779
780 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
781 if (remainder == s || strlen(remainder) > 1) {
782 return false;
783 }
784
785 switch (*remainder) {
786 case 'T': case 't':
787 *result = n * G * K;
788 // Check for overflow.
789 if (*result/((julong)G * K) != n) return false;
790 return true;
791 case 'G': case 'g':
792 *result = n * G;
793 if (*result/G != n) return false;
794 return true;
795 case 'M': case 'm':
796 *result = n * M;
797 if (*result/M != n) return false;
798 return true;
799 case 'K': case 'k':
800 *result = n * K;
801 if (*result/K != n) return false;
802 return true;
803 case '\0':
804 *result = n;
805 return true;
806 default:
807 return false;
808 }
809 }
810
811 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
812 if (size < min_size) return arg_too_small;
813 if (size > max_size) return arg_too_big;
814 return arg_in_range;
815 }
816
817 // Describe an argument out of range error
818 void Arguments::describe_range_error(ArgsRange errcode) {
819 switch(errcode) {
820 case arg_too_big:
821 jio_fprintf(defaultStream::error_stream(),
822 "The specified size exceeds the maximum "
823 "representable size.\n");
824 break;
825 case arg_too_small:
826 case arg_unreadable:
827 case arg_in_range:
828 // do nothing for now
829 break;
830 default:
831 ShouldNotReachHere();
832 }
833 }
834
835 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
836 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
837 return true;
838 } else {
839 return false;
840 }
841 }
842
843 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
844 char* end;
845 errno = 0;
846 double v = strtod(value, &end);
847 if ((errno != 0) || (*end != 0)) {
848 return false;
849 }
850
851 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
852 return true;
853 }
854 return false;
855 }
856
857 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
858 julong v;
859 int int_v;
860 intx intx_v;
861 bool is_neg = false;
862 Flag* result = Flag::find_flag(name, strlen(name));
863
864 if (result == NULL) {
865 return false;
866 }
867
868 // Check the sign first since atojulong() parses only unsigned values.
869 if (*value == '-') {
870 if (!result->is_intx() && !result->is_int()) {
871 return false;
872 }
873 value++;
874 is_neg = true;
875 }
876 if (!Arguments::atojulong(value, &v)) {
877 return false;
878 }
879 if (result->is_int()) {
880 int_v = (int) v;
881 if (is_neg) {
882 int_v = -int_v;
883 }
884 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
885 } else if (result->is_uint()) {
886 uint uint_v = (uint) v;
887 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
888 } else if (result->is_intx()) {
889 intx_v = (intx) v;
890 if (is_neg) {
891 intx_v = -intx_v;
892 }
893 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
894 } else if (result->is_uintx()) {
895 uintx uintx_v = (uintx) v;
896 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
897 } else if (result->is_uint64_t()) {
898 uint64_t uint64_t_v = (uint64_t) v;
899 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
900 } else if (result->is_size_t()) {
901 size_t size_t_v = (size_t) v;
902 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
903 } else if (result->is_double()) {
904 double double_v = (double) v;
905 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
906 } else {
907 return false;
908 }
909 }
910
911 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
912 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
913 // Contract: CommandLineFlags always returns a pointer that needs freeing.
914 FREE_C_HEAP_ARRAY(char, value);
915 return true;
916 }
917
918 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
919 const char* old_value = "";
920 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
921 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
922 size_t new_len = strlen(new_value);
923 const char* value;
924 char* free_this_too = NULL;
925 if (old_len == 0) {
926 value = new_value;
927 } else if (new_len == 0) {
928 value = old_value;
929 } else {
930 size_t length = old_len + 1 + new_len + 1;
931 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
932 // each new setting adds another LINE to the switch:
933 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
934 value = buf;
935 free_this_too = buf;
936 }
937 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
938 // CommandLineFlags always returns a pointer that needs freeing.
939 FREE_C_HEAP_ARRAY(char, value);
940 if (free_this_too != NULL) {
941 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
942 FREE_C_HEAP_ARRAY(char, free_this_too);
943 }
944 return true;
945 }
946
947 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
948 const char* real_name = real_flag_name(arg);
949 JDK_Version since = JDK_Version();
950 switch (is_deprecated_flag(arg, &since)) {
951 case -1:
952 return NULL; // obsolete or expired, don't process normally
953 case 0:
954 return real_name;
955 case 1: {
956 if (warn) {
957 char version[256];
958 since.to_string(version, sizeof(version));
959 if (real_name != arg) {
960 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
961 arg, version, real_name);
962 } else {
963 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
964 arg, version);
965 }
966 }
967 return real_name;
968 }
969 }
970 ShouldNotReachHere();
971 return NULL;
972 }
973
974 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
975 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
976 // Set tagset string buffer at max size of 256, large enough for any alias tagset
977 const int max_tagset_size = 256;
978 int max_tagset_len = max_tagset_size - 1;
979 char tagset_buffer[max_tagset_size];
980 tagset_buffer[0] = '\0';
981
982 // Write tag-set for aliased logging option, in string list form
983 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
984 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
985 if (i > 0) {
986 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
987 }
988 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
989 }
990 if (!alf.exactMatch) {
991 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
992 }
993 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
994 (on) ? "+" : "-",
995 name,
996 tagset_buffer,
997 (on) ? LogLevel::name(alf.level) : "off");
998 }
999
1000 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1001 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1002 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1003 if (strcmp(alf.alias_name, name) == 0) {
1004 log_deprecated_flag(name, on, alf);
1005 return alf;
1006 }
1007 }
1008 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1009 return a;
1010 }
1011
1012 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1013
1014 // range of acceptable characters spelled out for portability reasons
1015 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1016 #define BUFLEN 255
1017 char name[BUFLEN+1];
1018 char dummy;
1019 const char* real_name;
1020 bool warn_if_deprecated = true;
1021
1022 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1023 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1024 if (alf.alias_name != NULL){
1025 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1026 return true;
1027 }
1028 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1029 if (real_name == NULL) {
1030 return false;
1031 }
1032 return set_bool_flag(real_name, false, origin);
1033 }
1034 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1035 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1036 if (alf.alias_name != NULL){
1037 LogConfiguration::configure_stdout(alf.level, 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, true, origin);
1045 }
1046
1047 char punct;
1048 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1049 const char* value = strchr(arg, '=') + 1;
1050 Flag* flag;
1051
1052 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1053 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1054 if (alf.alias_name != NULL) {
1055 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1056 return true;
1057 }
1058 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1059 if (real_name == NULL) {
1060 return false;
1061 }
1062 flag = Flag::find_flag(real_name);
1063 if (flag != NULL && flag->is_ccstr()) {
1064 if (flag->ccstr_accumulates()) {
1065 return append_to_string_flag(real_name, value, origin);
1066 } else {
1067 if (value[0] == '\0') {
1068 value = NULL;
1069 }
1070 return set_string_flag(real_name, value, origin);
1071 }
1072 } else {
1073 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1074 }
1075 }
1076
1077 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1078 const char* value = strchr(arg, '=') + 1;
1079 // -XX:Foo:=xxx will reset the string flag to the given value.
1080 if (value[0] == '\0') {
1081 value = NULL;
1082 }
1083 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1084 if (real_name == NULL) {
1085 return false;
1086 }
1087 return set_string_flag(real_name, value, origin);
1088 }
1089
1090 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1091 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1092 #define NUMBER_RANGE "[0123456789eE+-]"
1093 char value[BUFLEN + 1];
1094 char value2[BUFLEN + 1];
1095 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1096 // Looks like a floating-point number -- try again with more lenient format string
1097 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1098 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1099 if (real_name == NULL) {
1100 return false;
1101 }
1102 return set_fp_numeric_flag(real_name, value, origin);
1103 }
1104 }
1105
1106 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1107 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1109 if (real_name == NULL) {
1110 return false;
1111 }
1112 return set_numeric_flag(real_name, value, origin);
1113 }
1114
1115 return false;
1116 }
1117
1118 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1119 assert(bldarray != NULL, "illegal argument");
1120
1121 if (arg == NULL) {
1122 return;
1123 }
1124
1125 int new_count = *count + 1;
1126
1127 // expand the array and add arg to the last element
1128 if (*bldarray == NULL) {
1129 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1130 } else {
1131 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1132 }
1133 (*bldarray)[*count] = os::strdup_check_oom(arg);
1134 *count = new_count;
1135 }
1136
1137 void Arguments::build_jvm_args(const char* arg) {
1138 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1139 }
1140
1141 void Arguments::build_jvm_flags(const char* arg) {
1142 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1143 }
1144
1145 // utility function to return a string that concatenates all
1146 // strings in a given char** array
1147 const char* Arguments::build_resource_string(char** args, int count) {
1148 if (args == NULL || count == 0) {
1149 return NULL;
1150 }
1151 size_t length = 0;
1152 for (int i = 0; i < count; i++) {
1153 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1154 }
1155 char* s = NEW_RESOURCE_ARRAY(char, length);
1156 char* dst = s;
1157 for (int j = 0; j < count; j++) {
1158 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1159 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1160 dst += offset;
1161 length -= offset;
1162 }
1163 return (const char*) s;
1164 }
1165
1166 void Arguments::print_on(outputStream* st) {
1167 st->print_cr("VM Arguments:");
1168 if (num_jvm_flags() > 0) {
1169 st->print("jvm_flags: "); print_jvm_flags_on(st);
1170 st->cr();
1171 }
1172 if (num_jvm_args() > 0) {
1173 st->print("jvm_args: "); print_jvm_args_on(st);
1174 st->cr();
1175 }
1176 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1177 if (_java_class_path != NULL) {
1178 char* path = _java_class_path->value();
1179 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1180 }
1181 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1182 }
1183
1184 void Arguments::print_summary_on(outputStream* st) {
1185 // Print the command line. Environment variables that are helpful for
1186 // reproducing the problem are written later in the hs_err file.
1187 // flags are from setting file
1188 if (num_jvm_flags() > 0) {
1189 st->print_raw("Settings File: ");
1190 print_jvm_flags_on(st);
1191 st->cr();
1192 }
1193 // args are the command line and environment variable arguments.
1194 st->print_raw("Command Line: ");
1195 if (num_jvm_args() > 0) {
1196 print_jvm_args_on(st);
1197 }
1198 // this is the classfile and any arguments to the java program
1199 if (java_command() != NULL) {
1200 st->print("%s", java_command());
1201 }
1202 st->cr();
1203 }
1204
1205 void Arguments::print_jvm_flags_on(outputStream* st) {
1206 if (_num_jvm_flags > 0) {
1207 for (int i=0; i < _num_jvm_flags; i++) {
1208 st->print("%s ", _jvm_flags_array[i]);
1209 }
1210 }
1211 }
1212
1213 void Arguments::print_jvm_args_on(outputStream* st) {
1214 if (_num_jvm_args > 0) {
1215 for (int i=0; i < _num_jvm_args; i++) {
1216 st->print("%s ", _jvm_args_array[i]);
1217 }
1218 }
1219 }
1220
1221 bool Arguments::process_argument(const char* arg,
1222 jboolean ignore_unrecognized,
1223 Flag::Flags origin) {
1224 JDK_Version since = JDK_Version();
1225
1226 if (parse_argument(arg, origin)) {
1227 return true;
1228 }
1229
1230 // Determine if the flag has '+', '-', or '=' characters.
1231 bool has_plus_minus = (*arg == '+' || *arg == '-');
1232 const char* const argname = has_plus_minus ? arg + 1 : arg;
1233
1234 size_t arg_len;
1235 const char* equal_sign = strchr(argname, '=');
1236 if (equal_sign == NULL) {
1237 arg_len = strlen(argname);
1238 } else {
1239 arg_len = equal_sign - argname;
1240 }
1241
1242 // Only make the obsolete check for valid arguments.
1243 if (arg_len <= BUFLEN) {
1244 // Construct a string which consists only of the argument name without '+', '-', or '='.
1245 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1246 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1247 if (is_obsolete_flag(stripped_argname, &since)) {
1248 char version[256];
1249 since.to_string(version, sizeof(version));
1250 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1251 return true;
1252 }
1253 #ifndef PRODUCT
1254 else {
1255 const char* replacement;
1256 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1257 log_warning(arguments)("%s has been removed. Please use %s instead.",
1258 stripped_argname,
1259 replacement);
1260 return false;
1261 }
1262 }
1263 #endif //PRODUCT
1264 }
1265
1266 // For locked flags, report a custom error message if available.
1267 // Otherwise, report the standard unrecognized VM option.
1268 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1269 if (found_flag != NULL) {
1270 char locked_message_buf[BUFLEN];
1271 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1272 if (strlen(locked_message_buf) == 0) {
1273 if (found_flag->is_bool() && !has_plus_minus) {
1274 jio_fprintf(defaultStream::error_stream(),
1275 "Missing +/- setting for VM option '%s'\n", argname);
1276 } else if (!found_flag->is_bool() && has_plus_minus) {
1277 jio_fprintf(defaultStream::error_stream(),
1278 "Unexpected +/- setting in VM option '%s'\n", argname);
1279 } else {
1280 jio_fprintf(defaultStream::error_stream(),
1281 "Improperly specified VM option '%s'\n", argname);
1282 }
1283 } else {
1284 #ifdef PRODUCT
1285 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1286 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1287 if (ignore_unrecognized && mismatched) {
1288 return true;
1289 }
1290 #endif
1291 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1292 }
1293 } else {
1294 if (ignore_unrecognized) {
1295 return true;
1296 }
1297 jio_fprintf(defaultStream::error_stream(),
1298 "Unrecognized VM option '%s'\n", argname);
1299 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1300 if (fuzzy_matched != NULL) {
1301 jio_fprintf(defaultStream::error_stream(),
1302 "Did you mean '%s%s%s'? ",
1303 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1304 fuzzy_matched->_name,
1305 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1306 }
1307 }
1308
1309 // allow for commandline "commenting out" options like -XX:#+Verbose
1310 return arg[0] == '#';
1311 }
1312
1313 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1314 FILE* stream = fopen(file_name, "rb");
1315 if (stream == NULL) {
1316 if (should_exist) {
1317 jio_fprintf(defaultStream::error_stream(),
1318 "Could not open settings file %s\n", file_name);
1319 return false;
1320 } else {
1321 return true;
1322 }
1323 }
1324
1325 char token[1024];
1326 int pos = 0;
1327
1328 bool in_white_space = true;
1329 bool in_comment = false;
1330 bool in_quote = false;
1331 char quote_c = 0;
1332 bool result = true;
1333
1334 int c = getc(stream);
1335 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1336 if (in_white_space) {
1337 if (in_comment) {
1338 if (c == '\n') in_comment = false;
1339 } else {
1340 if (c == '#') in_comment = true;
1341 else if (!isspace(c)) {
1342 in_white_space = false;
1343 token[pos++] = c;
1344 }
1345 }
1346 } else {
1347 if (c == '\n' || (!in_quote && isspace(c))) {
1348 // token ends at newline, or at unquoted whitespace
1349 // this allows a way to include spaces in string-valued options
1350 token[pos] = '\0';
1351 logOption(token);
1352 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1353 build_jvm_flags(token);
1354 pos = 0;
1355 in_white_space = true;
1356 in_quote = false;
1357 } else if (!in_quote && (c == '\'' || c == '"')) {
1358 in_quote = true;
1359 quote_c = c;
1360 } else if (in_quote && (c == quote_c)) {
1361 in_quote = false;
1362 } else {
1363 token[pos++] = c;
1364 }
1365 }
1366 c = getc(stream);
1367 }
1368 if (pos > 0) {
1369 token[pos] = '\0';
1370 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1371 build_jvm_flags(token);
1372 }
1373 fclose(stream);
1374 return result;
1375 }
1376
1377 //=============================================================================================================
1378 // Parsing of properties (-D)
1379
1380 const char* Arguments::get_property(const char* key) {
1381 return PropertyList_get_value(system_properties(), key);
1382 }
1383
1384 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1385 const char* eq = strchr(prop, '=');
1386 const char* key;
1387 const char* value = "";
1388
1389 if (eq == NULL) {
1390 // property doesn't have a value, thus use passed string
1391 key = prop;
1392 } else {
1393 // property have a value, thus extract it and save to the
1394 // allocated string
1395 size_t key_len = eq - prop;
1396 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1397
1398 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1399 key = tmp_key;
1400
1401 value = &prop[key_len + 1];
1402 }
1403
1404 if (strcmp(key, "java.compiler") == 0) {
1405 process_java_compiler_argument(value);
1406 // Record value in Arguments, but let it get passed to Java.
1407 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1408 strcmp(key, "sun.java.launcher.pid") == 0) {
1409 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1410 // private and are processed in process_sun_java_launcher_properties();
1411 // the sun.java.launcher property is passed on to the java application
1412 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1413 // append is true, writable is true, internal is false
1414 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1415 WriteableProperty, ExternalProperty);
1416 } else {
1417 if (strcmp(key, "sun.java.command") == 0) {
1418 char *old_java_command = _java_command;
1419 _java_command = os::strdup_check_oom(value, mtArguments);
1420 if (old_java_command != NULL) {
1421 os::free(old_java_command);
1422 }
1423 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1424 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1425 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1426 // its value without going through the property list or making a Java call.
1427 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1428 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1429 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1430 os::free((void *)old_java_vendor_url_bug);
1431 }
1432 }
1433
1434 // Create new property and add at the end of the list
1435 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1436 }
1437
1438 if (key != prop) {
1439 // SystemProperty copy passed value, thus free previously allocated
1440 // memory
1441 FreeHeap((void *)key);
1442 }
1443
1444 return true;
1445 }
1446
1447 #if INCLUDE_CDS
1448 void Arguments::check_unsupported_dumping_properties() {
1449 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1450 const char* unsupported_properties[] = { "jdk.module.main",
1451 "jdk.module.limitmods",
1452 "jdk.module.path",
1453 "jdk.module.upgrade.path",
1454 "jdk.module.patch.0" };
1455 const char* unsupported_options[] = { "-m", // cannot use at dump time
1456 "--limit-modules", // ignored at dump time
1457 "--module-path", // ignored at dump time
1458 "--upgrade-module-path", // ignored at dump time
1459 "--patch-module" // ignored at dump time
1460 };
1461 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1462 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1463 // vm will exit with an error message. Otherwise, it will print an informational message if
1464 // -Xlog:cds is enabled.
1465 uint info_idx = 1;
1466 SystemProperty* sp = system_properties();
1467 while (sp != NULL) {
1468 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1469 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1470 if (i < info_idx) {
1471 vm_exit_during_initialization(
1472 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1473 } else {
1474 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1475 unsupported_options[i]);
1476 }
1477 }
1478 }
1479 sp = sp->next();
1480 }
1481
1482 // Check for an exploded module build in use with -Xshare:dump.
1483 if (!has_jimage()) {
1484 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1485 }
1486 }
1487 #endif
1488
1489 //===========================================================================================================
1490 // Setting int/mixed/comp mode flags
1491
1492 void Arguments::set_mode_flags(Mode mode) {
1493 // Set up default values for all flags.
1494 // If you add a flag to any of the branches below,
1495 // add a default value for it here.
1496 set_java_compiler(false);
1497 _mode = mode;
1498
1499 // Ensure Agent_OnLoad has the correct initial values.
1500 // This may not be the final mode; mode may change later in onload phase.
1501 PropertyList_unique_add(&_system_properties, "java.vm.info",
1502 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1503
1504 UseInterpreter = true;
1505 UseCompiler = true;
1506 UseLoopCounter = true;
1507
1508 // Default values may be platform/compiler dependent -
1509 // use the saved values
1510 ClipInlining = Arguments::_ClipInlining;
1511 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1512 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1513 BackgroundCompilation = Arguments::_BackgroundCompilation;
1514 if (TieredCompilation) {
1515 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1516 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1517 }
1518 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1519 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1520 }
1521 }
1522
1523 // Change from defaults based on mode
1524 switch (mode) {
1525 default:
1526 ShouldNotReachHere();
1527 break;
1528 case _int:
1529 UseCompiler = false;
1530 UseLoopCounter = false;
1531 AlwaysCompileLoopMethods = false;
1532 UseOnStackReplacement = false;
1533 break;
1534 case _mixed:
1535 // same as default
1536 break;
1537 case _comp:
1538 UseInterpreter = false;
1539 BackgroundCompilation = false;
1540 ClipInlining = false;
1541 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1542 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1543 // compile a level 4 (C2) and then continue executing it.
1544 if (TieredCompilation) {
1545 Tier3InvokeNotifyFreqLog = 0;
1546 Tier4InvocationThreshold = 0;
1547 }
1548 break;
1549 }
1550 }
1551
1552 // Conflict: required to use shared spaces (-Xshare:on), but
1553 // incompatible command line options were chosen.
1554 static void no_shared_spaces(const char* message) {
1555 if (RequireSharedSpaces) {
1556 jio_fprintf(defaultStream::error_stream(),
1557 "Class data sharing is inconsistent with other specified options.\n");
1558 vm_exit_during_initialization("Unable to use shared archive.", message);
1559 } else {
1560 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1561 }
1562 }
1563
1564 // Returns threshold scaled with the value of scale.
1565 // If scale < 0.0, threshold is returned without scaling.
1566 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1567 if (scale == 1.0 || scale < 0.0) {
1568 return threshold;
1569 } else {
1570 return (intx)(threshold * scale);
1571 }
1572 }
1573
1574 // Returns freq_log scaled with the value of scale.
1575 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1576 // If scale < 0.0, freq_log is returned without scaling.
1577 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1578 // Check if scaling is necessary or if negative value was specified.
1579 if (scale == 1.0 || scale < 0.0) {
1580 return freq_log;
1581 }
1582 // Check values to avoid calculating log2 of 0.
1583 if (scale == 0.0 || freq_log == 0) {
1584 return 0;
1585 }
1586 // Determine the maximum notification frequency value currently supported.
1587 // The largest mask value that the interpreter/C1 can handle is
1588 // of length InvocationCounter::number_of_count_bits. Mask values are always
1589 // one bit shorter then the value of the notification frequency. Set
1590 // max_freq_bits accordingly.
1591 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1592 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1593 if (scaled_freq == 0) {
1594 // Return 0 right away to avoid calculating log2 of 0.
1595 return 0;
1596 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1597 return max_freq_bits;
1598 } else {
1599 return log2_intptr(scaled_freq);
1600 }
1601 }
1602
1603 void Arguments::set_tiered_flags() {
1604 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1605 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1606 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1607 }
1608 if (CompilationPolicyChoice < 2) {
1609 vm_exit_during_initialization(
1610 "Incompatible compilation policy selected", NULL);
1611 }
1612 // Increase the code cache size - tiered compiles a lot more.
1613 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1614 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1615 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1616 }
1617 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1618 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1619 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1620 }
1621 if (!UseInterpreter) { // -Xcomp
1622 Tier3InvokeNotifyFreqLog = 0;
1623 Tier4InvocationThreshold = 0;
1624 }
1625
1626 if (CompileThresholdScaling < 0) {
1627 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1628 }
1629
1630 // Scale tiered compilation thresholds.
1631 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1632 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1633 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1634 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1635
1636 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1637 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1638 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1639 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1640
1641 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1642 // once these thresholds become supported.
1643
1644 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1645 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1646
1647 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1648 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1649
1650 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1651
1652 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1653 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1654 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1655 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1656 }
1657 }
1658
1659 void set_object_alignment() {
1660 // Object alignment.
1661 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1662 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1663 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1664 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1665 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1666 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1667
1668 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1669 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1670
1671 // Oop encoding heap max
1672 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1673
1674 if (SurvivorAlignmentInBytes == 0) {
1675 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1676 }
1677 }
1678
1679 size_t Arguments::max_heap_for_compressed_oops() {
1680 // Avoid sign flip.
1681 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1682 // We need to fit both the NULL page and the heap into the memory budget, while
1683 // keeping alignment constraints of the heap. To guarantee the latter, as the
1684 // NULL page is located before the heap, we pad the NULL page to the conservative
1685 // maximum alignment that the GC may ever impose upon the heap.
1686 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1687 _conservative_max_heap_alignment);
1688
1689 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1690 NOT_LP64(ShouldNotReachHere(); return 0);
1691 }
1692
1693 void Arguments::set_use_compressed_oops() {
1694 #ifndef ZERO
1695 #ifdef _LP64
1696 // MaxHeapSize is not set up properly at this point, but
1697 // the only value that can override MaxHeapSize if we are
1698 // to use UseCompressedOops is InitialHeapSize.
1699 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1700
1701 if (max_heap_size <= max_heap_for_compressed_oops()) {
1702 #if !defined(COMPILER1) || defined(TIERED)
1703 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1704 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1705 }
1706 #endif
1707 } else {
1708 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1709 warning("Max heap size too large for Compressed Oops");
1710 FLAG_SET_DEFAULT(UseCompressedOops, false);
1711 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1712 }
1713 }
1714 #endif // _LP64
1715 #endif // ZERO
1716 }
1717
1718
1719 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1720 // set_use_compressed_oops().
1721 void Arguments::set_use_compressed_klass_ptrs() {
1722 #ifndef ZERO
1723 #ifdef _LP64
1724 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1725 if (!UseCompressedOops) {
1726 if (UseCompressedClassPointers) {
1727 warning("UseCompressedClassPointers requires UseCompressedOops");
1728 }
1729 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1730 } else {
1731 // Turn on UseCompressedClassPointers too
1732 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1733 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1734 }
1735 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1736 if (UseCompressedClassPointers) {
1737 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1738 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1739 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1740 }
1741 }
1742 }
1743 #endif // _LP64
1744 #endif // !ZERO
1745 }
1746
1747 void Arguments::set_conservative_max_heap_alignment() {
1748 // The conservative maximum required alignment for the heap is the maximum of
1749 // the alignments imposed by several sources: any requirements from the heap
1750 // itself, the collector policy and the maximum page size we may run the VM
1751 // with.
1752 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1753 _conservative_max_heap_alignment = MAX4(heap_alignment,
1754 (size_t)os::vm_allocation_granularity(),
1755 os::max_page_size(),
1756 CollectorPolicy::compute_heap_alignment());
1757 }
1758
1759 #ifdef TIERED
1760 bool Arguments::compilation_mode_selected() {
1761 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1762 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1763
1764 }
1765
1766 void Arguments::select_compilation_mode_ergonomically() {
1767 #if defined(_WINDOWS) && !defined(_LP64)
1768 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1769 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1770 }
1771 #endif
1772 if (NeverActAsServerClassMachine) {
1773 set_client_compilation_mode();
1774 }
1775 }
1776 #endif //TIERED
1777
1778 #if INCLUDE_JVMCI
1779 void Arguments::set_jvmci_specific_flags() {
1780 if (UseJVMCICompiler) {
1781 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1782 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1783 }
1784 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1785 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1786 }
1787 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1788 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1789 }
1790 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1791 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1792 }
1793 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1794 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1795 }
1796 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1797 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1798 }
1799 if (TieredStopAtLevel != CompLevel_full_optimization) {
1800 // Currently JVMCI compiler can only work at the full optimization level
1801 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1802 TieredStopAtLevel = CompLevel_full_optimization;
1803 }
1804 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1805 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1806 }
1807 }
1808 }
1809 #endif
1810
1811 jint Arguments::set_ergonomics_flags() {
1812 #ifdef TIERED
1813 if (!compilation_mode_selected()) {
1814 select_compilation_mode_ergonomically();
1815 }
1816 #endif
1817
1818 jint gc_result = GCArguments::initialize();
1819 if (gc_result != JNI_OK) {
1820 return gc_result;
1821 }
1822
1823 #if COMPILER2_OR_JVMCI
1824 // Shared spaces work fine with other GCs but causes bytecode rewriting
1825 // to be disabled, which hurts interpreter performance and decreases
1826 // server performance. When -server is specified, keep the default off
1827 // unless it is asked for. Future work: either add bytecode rewriting
1828 // at link time, or rewrite bytecodes in non-shared methods.
1829 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1830 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1831 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1832 }
1833 #endif
1834
1835 #if defined(IA32)
1836 // Only server compiler can optimize safepoints well enough.
1837 if (!is_server_compilation_mode_vm()) {
1838 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1839 }
1840 #endif
1841
1842 set_conservative_max_heap_alignment();
1843
1844 #ifndef ZERO
1845 #ifdef _LP64
1846 set_use_compressed_oops();
1847
1848 // set_use_compressed_klass_ptrs() must be called after calling
1849 // set_use_compressed_oops().
1850 set_use_compressed_klass_ptrs();
1851
1852 // Also checks that certain machines are slower with compressed oops
1853 // in vm_version initialization code.
1854 #endif // _LP64
1855 #endif // !ZERO
1856
1857 return JNI_OK;
1858 }
1859
1860 julong Arguments::limit_by_allocatable_memory(julong limit) {
1861 julong max_allocatable;
1862 julong result = limit;
1863 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1864 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1865 }
1866 return result;
1867 }
1868
1869 // Use static initialization to get the default before parsing
1870 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1871
1872 void Arguments::set_heap_size() {
1873 julong phys_mem =
1874 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1875 : (julong)MaxRAM;
1876
1877 // Convert deprecated flags
1878 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1879 !FLAG_IS_DEFAULT(MaxRAMFraction))
1880 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1881
1882 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1883 !FLAG_IS_DEFAULT(MinRAMFraction))
1884 MinRAMPercentage = 100.0 / MinRAMFraction;
1885
1886 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1887 !FLAG_IS_DEFAULT(InitialRAMFraction))
1888 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1889
1890 // If the maximum heap size has not been set with -Xmx,
1891 // then set it as fraction of the size of physical memory,
1892 // respecting the maximum and minimum sizes of the heap.
1893 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1894 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1895 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1896 if (reasonable_min < MaxHeapSize) {
1897 // Small physical memory, so use a minimum fraction of it for the heap
1898 reasonable_max = reasonable_min;
1899 } else {
1900 // Not-small physical memory, so require a heap at least
1901 // as large as MaxHeapSize
1902 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1903 }
1904
1905 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1906 // Limit the heap size to ErgoHeapSizeLimit
1907 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1908 }
1909 if (UseCompressedOops) {
1910 // Limit the heap size to the maximum possible when using compressed oops
1911 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1912
1913 // HeapBaseMinAddress can be greater than default but not less than.
1914 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1915 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1916 // matches compressed oops printing flags
1917 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1918 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1919 DefaultHeapBaseMinAddress,
1920 DefaultHeapBaseMinAddress/G,
1921 HeapBaseMinAddress);
1922 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1923 }
1924 }
1925
1926 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1927 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1928 // but it should be not less than default MaxHeapSize.
1929 max_coop_heap -= HeapBaseMinAddress;
1930 }
1931 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1932 }
1933 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1934
1935 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1936 // An initial heap size was specified on the command line,
1937 // so be sure that the maximum size is consistent. Done
1938 // after call to limit_by_allocatable_memory because that
1939 // method might reduce the allocation size.
1940 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1941 }
1942
1943 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1944 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1945 }
1946
1947 // If the minimum or initial heap_size have not been set or requested to be set
1948 // ergonomically, set them accordingly.
1949 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1950 julong reasonable_minimum = (julong)(OldSize + NewSize);
1951
1952 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1953
1954 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1955
1956 if (InitialHeapSize == 0) {
1957 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1958
1959 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1960 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1961
1962 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1963
1964 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1965 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1966 }
1967 // If the minimum heap size has not been set (via -Xms),
1968 // synchronize with InitialHeapSize to avoid errors with the default value.
1969 if (min_heap_size() == 0) {
1970 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1971 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1972 }
1973 }
1974 }
1975
1976 // This option inspects the machine and attempts to set various
1977 // parameters to be optimal for long-running, memory allocation
1978 // intensive jobs. It is intended for machines with large
1979 // amounts of cpu and memory.
1980 jint Arguments::set_aggressive_heap_flags() {
1981 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1982 // VM, but we may not be able to represent the total physical memory
1983 // available (like having 8gb of memory on a box but using a 32bit VM).
1984 // Thus, we need to make sure we're using a julong for intermediate
1985 // calculations.
1986 julong initHeapSize;
1987 julong total_memory = os::physical_memory();
1988
1989 if (total_memory < (julong) 256 * M) {
1990 jio_fprintf(defaultStream::error_stream(),
1991 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1992 vm_exit(1);
1993 }
1994
1995 // The heap size is half of available memory, or (at most)
1996 // all of possible memory less 160mb (leaving room for the OS
1997 // when using ISM). This is the maximum; because adaptive sizing
1998 // is turned on below, the actual space used may be smaller.
1999
2000 initHeapSize = MIN2(total_memory / (julong) 2,
2001 total_memory - (julong) 160 * M);
2002
2003 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2004
2005 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2006 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2007 return JNI_EINVAL;
2008 }
2009 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2010 return JNI_EINVAL;
2011 }
2012 // Currently the minimum size and the initial heap sizes are the same.
2013 set_min_heap_size(initHeapSize);
2014 }
2015 if (FLAG_IS_DEFAULT(NewSize)) {
2016 // Make the young generation 3/8ths of the total heap.
2017 if (FLAG_SET_CMDLINE(size_t, NewSize,
2018 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2019 return JNI_EINVAL;
2020 }
2021 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2022 return JNI_EINVAL;
2023 }
2024 }
2025
2026 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2027 FLAG_SET_DEFAULT(UseLargePages, true);
2028 #endif
2029
2030 // Increase some data structure sizes for efficiency
2031 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2032 return JNI_EINVAL;
2033 }
2034 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2035 return JNI_EINVAL;
2036 }
2037 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2038 return JNI_EINVAL;
2039 }
2040
2041 // See the OldPLABSize comment below, but replace 'after promotion'
2042 // with 'after copying'. YoungPLABSize is the size of the survivor
2043 // space per-gc-thread buffers. The default is 4kw.
2044 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2045 return JNI_EINVAL;
2046 }
2047
2048 // OldPLABSize is the size of the buffers in the old gen that
2049 // UseParallelGC uses to promote live data that doesn't fit in the
2050 // survivor spaces. At any given time, there's one for each gc thread.
2051 // The default size is 1kw. These buffers are rarely used, since the
2052 // survivor spaces are usually big enough. For specjbb, however, there
2053 // are occasions when there's lots of live data in the young gen
2054 // and we end up promoting some of it. We don't have a definite
2055 // explanation for why bumping OldPLABSize helps, but the theory
2056 // is that a bigger PLAB results in retaining something like the
2057 // original allocation order after promotion, which improves mutator
2058 // locality. A minor effect may be that larger PLABs reduce the
2059 // number of PLAB allocation events during gc. The value of 8kw
2060 // was arrived at by experimenting with specjbb.
2061 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2062 return JNI_EINVAL;
2063 }
2064
2065 // Enable parallel GC and adaptive generation sizing
2066 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2067 return JNI_EINVAL;
2068 }
2069
2070 // Encourage steady state memory management
2071 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2072 return JNI_EINVAL;
2073 }
2074
2075 // This appears to improve mutator locality
2076 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2077 return JNI_EINVAL;
2078 }
2079
2080 // Get around early Solaris scheduling bug
2081 // (affinity vs other jobs on system)
2082 // but disallow DR and offlining (5008695).
2083 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2084 return JNI_EINVAL;
2085 }
2086
2087 return JNI_OK;
2088 }
2089
2090 // This must be called after ergonomics.
2091 void Arguments::set_bytecode_flags() {
2092 if (!RewriteBytecodes) {
2093 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2094 }
2095 }
2096
2097 // Aggressive optimization flags -XX:+AggressiveOpts
2098 jint Arguments::set_aggressive_opts_flags() {
2099 #ifdef COMPILER2
2100 if (AggressiveUnboxing) {
2101 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2102 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2103 } else if (!EliminateAutoBox) {
2104 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2105 AggressiveUnboxing = false;
2106 }
2107 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2108 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2109 } else if (!DoEscapeAnalysis) {
2110 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2111 AggressiveUnboxing = false;
2112 }
2113 }
2114 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2115 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2116 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2117 }
2118 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2119 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2120 }
2121
2122 // Feed the cache size setting into the JDK
2123 char buffer[1024];
2124 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2125 if (!add_property(buffer)) {
2126 return JNI_ENOMEM;
2127 }
2128 }
2129 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2130 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2131 }
2132 #endif
2133
2134 if (AggressiveOpts) {
2135 // Sample flag setting code
2136 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2137 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2138 // }
2139 }
2140
2141 return JNI_OK;
2142 }
2143
2144 //===========================================================================================================
2145 // Parsing of java.compiler property
2146
2147 void Arguments::process_java_compiler_argument(const char* arg) {
2148 // For backwards compatibility, Djava.compiler=NONE or ""
2149 // causes us to switch to -Xint mode UNLESS -Xdebug
2150 // is also specified.
2151 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2152 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2153 }
2154 }
2155
2156 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2157 _sun_java_launcher = os::strdup_check_oom(launcher);
2158 }
2159
2160 bool Arguments::created_by_java_launcher() {
2161 assert(_sun_java_launcher != NULL, "property must have value");
2162 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2163 }
2164
2165 bool Arguments::sun_java_launcher_is_altjvm() {
2166 return _sun_java_launcher_is_altjvm;
2167 }
2168
2169 //===========================================================================================================
2170 // Parsing of main arguments
2171
2172 #if INCLUDE_JVMCI
2173 // Check consistency of jvmci vm argument settings.
2174 bool Arguments::check_jvmci_args_consistency() {
2175 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2176 }
2177 #endif //INCLUDE_JVMCI
2178
2179 // Check consistency of GC selection
2180 bool Arguments::check_gc_consistency() {
2181 // Ensure that the user has not selected conflicting sets
2182 // of collectors.
2183 uint i = 0;
2184 if (UseSerialGC) i++;
2185 if (UseConcMarkSweepGC) i++;
2186 if (UseParallelGC || UseParallelOldGC) i++;
2187 if (UseG1GC) i++;
2188 if (i > 1) {
2189 jio_fprintf(defaultStream::error_stream(),
2190 "Conflicting collector combinations in option list; "
2191 "please refer to the release notes for the combinations "
2192 "allowed\n");
2193 return false;
2194 }
2195
2196 return true;
2197 }
2198
2199 // Check the consistency of vm_init_args
2200 bool Arguments::check_vm_args_consistency() {
2201 // Method for adding checks for flag consistency.
2202 // The intent is to warn the user of all possible conflicts,
2203 // before returning an error.
2204 // Note: Needs platform-dependent factoring.
2205 bool status = true;
2206
2207 if (TLABRefillWasteFraction == 0) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "TLABRefillWasteFraction should be a denominator, "
2210 "not " SIZE_FORMAT "\n",
2211 TLABRefillWasteFraction);
2212 status = false;
2213 }
2214
2215 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2216 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2217 }
2218
2219 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2220 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2221 }
2222
2223 if (GCTimeLimit == 100) {
2224 // Turn off gc-overhead-limit-exceeded checks
2225 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2226 }
2227
2228 status = status && check_gc_consistency();
2229
2230 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2231 // insists that we hold the requisite locks so that the iteration is
2232 // MT-safe. For the verification at start-up and shut-down, we don't
2233 // yet have a good way of acquiring and releasing these locks,
2234 // which are not visible at the CollectedHeap level. We want to
2235 // be able to acquire these locks and then do the iteration rather
2236 // than just disable the lock verification. This will be fixed under
2237 // bug 4788986.
2238 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2239 if (VerifyDuringStartup) {
2240 warning("Heap verification at start-up disabled "
2241 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2242 VerifyDuringStartup = false; // Disable verification at start-up
2243 }
2244
2245 if (VerifyBeforeExit) {
2246 warning("Heap verification at shutdown disabled "
2247 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2248 VerifyBeforeExit = false; // Disable verification at shutdown
2249 }
2250 }
2251
2252 if (PrintNMTStatistics) {
2253 #if INCLUDE_NMT
2254 if (MemTracker::tracking_level() == NMT_off) {
2255 #endif // INCLUDE_NMT
2256 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2257 PrintNMTStatistics = false;
2258 #if INCLUDE_NMT
2259 }
2260 #endif
2261 }
2262
2263 #if INCLUDE_JVMCI
2264 status = status && check_jvmci_args_consistency();
2265
2266 if (EnableJVMCI) {
2267 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2268 AddProperty, UnwriteableProperty, InternalProperty);
2269
2270 if (!ScavengeRootsInCode) {
2271 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2272 ScavengeRootsInCode = 1;
2273 }
2274 }
2275 #endif
2276
2277 // Check lower bounds of the code cache
2278 // Template Interpreter code is approximately 3X larger in debug builds.
2279 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2280 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2281 jio_fprintf(defaultStream::error_stream(),
2282 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2283 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2284 status = false;
2285 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2288 min_code_cache_size/K);
2289 status = false;
2290 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2291 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2292 jio_fprintf(defaultStream::error_stream(),
2293 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2294 CODE_CACHE_SIZE_LIMIT/M);
2295 status = false;
2296 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2297 jio_fprintf(defaultStream::error_stream(),
2298 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2299 min_code_cache_size/K);
2300 status = false;
2301 }
2302
2303 #ifdef _LP64
2304 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2305 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2306 }
2307 #endif
2308
2309 #ifndef SUPPORT_RESERVED_STACK_AREA
2310 if (StackReservedPages != 0) {
2311 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2312 warning("Reserved Stack Area not supported on this platform");
2313 }
2314 #endif
2315
2316 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2317 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2318 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2319 }
2320 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2321 }
2322 if (UseCompiler && is_interpreter_only()) {
2323 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2324 warning("UseCompiler disabled due to -Xint.");
2325 }
2326 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2327 }
2328 #ifdef COMPILER2
2329 if (PostLoopMultiversioning && !RangeCheckElimination) {
2330 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2331 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2332 }
2333 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2334 }
2335 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2336 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2337 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2338 }
2339 LoopStripMiningIter = 1;
2340 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2341 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2342 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2343 }
2344 LoopStripMiningIter = 0;
2345 }
2346 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2347 // blind guess
2348 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2349 }
2350 #endif
2351 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2352 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2353 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2354 }
2355 }
2356 return status;
2357 }
2358
2359 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2360 const char* option_type) {
2361 if (ignore) return false;
2362
2363 const char* spacer = " ";
2364 if (option_type == NULL) {
2365 option_type = ++spacer; // Set both to the empty string.
2366 }
2367
2368 if (os::obsolete_option(option)) {
2369 jio_fprintf(defaultStream::error_stream(),
2370 "Obsolete %s%soption: %s\n", option_type, spacer,
2371 option->optionString);
2372 return false;
2373 } else {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Unrecognized %s%soption: %s\n", option_type, spacer,
2376 option->optionString);
2377 return true;
2378 }
2379 }
2380
2381 static const char* user_assertion_options[] = {
2382 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2383 };
2384
2385 static const char* system_assertion_options[] = {
2386 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2387 };
2388
2389 bool Arguments::parse_uintx(const char* value,
2390 uintx* uintx_arg,
2391 uintx min_size) {
2392
2393 // Check the sign first since atojulong() parses only unsigned values.
2394 bool value_is_positive = !(*value == '-');
2395
2396 if (value_is_positive) {
2397 julong n;
2398 bool good_return = atojulong(value, &n);
2399 if (good_return) {
2400 bool above_minimum = n >= min_size;
2401 bool value_is_too_large = n > max_uintx;
2402
2403 if (above_minimum && !value_is_too_large) {
2404 *uintx_arg = n;
2405 return true;
2406 }
2407 }
2408 }
2409 return false;
2410 }
2411
2412 unsigned int addreads_count = 0;
2413 unsigned int addexports_count = 0;
2414 unsigned int addopens_count = 0;
2415 unsigned int addmods_count = 0;
2416 unsigned int patch_mod_count = 0;
2417
2418 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2419 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2420 char* property = AllocateHeap(prop_len, mtArguments);
2421 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2422 if (ret < 0 || ret >= (int)prop_len) {
2423 FreeHeap(property);
2424 return false;
2425 }
2426 bool added = add_property(property, UnwriteableProperty, internal);
2427 FreeHeap(property);
2428 return added;
2429 }
2430
2431 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2432 const unsigned int props_count_limit = 1000;
2433 const int max_digits = 3;
2434 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2435
2436 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2437 if (count < props_count_limit) {
2438 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2439 char* property = AllocateHeap(prop_len, mtArguments);
2440 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2441 if (ret < 0 || ret >= (int)prop_len) {
2442 FreeHeap(property);
2443 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2444 return false;
2445 }
2446 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2447 FreeHeap(property);
2448 return added;
2449 }
2450
2451 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2452 return false;
2453 }
2454
2455 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2456 julong* long_arg,
2457 julong min_size,
2458 julong max_size) {
2459 if (!atojulong(s, long_arg)) return arg_unreadable;
2460 return check_memory_size(*long_arg, min_size, max_size);
2461 }
2462
2463 // Parse JavaVMInitArgs structure
2464
2465 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2466 const JavaVMInitArgs *java_options_args,
2467 const JavaVMInitArgs *cmd_line_args) {
2468 bool patch_mod_javabase = false;
2469
2470 // Save default settings for some mode flags
2471 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2472 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2473 Arguments::_ClipInlining = ClipInlining;
2474 Arguments::_BackgroundCompilation = BackgroundCompilation;
2475 if (TieredCompilation) {
2476 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2477 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2478 }
2479
2480 // Setup flags for mixed which is the default
2481 set_mode_flags(_mixed);
2482
2483 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2484 // variable (if present).
2485 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2486 if (result != JNI_OK) {
2487 return result;
2488 }
2489
2490 // Parse args structure generated from the command line flags.
2491 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2492 if (result != JNI_OK) {
2493 return result;
2494 }
2495
2496 // Parse args structure generated from the _JAVA_OPTIONS environment
2497 // variable (if present) (mimics classic VM)
2498 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2499 if (result != JNI_OK) {
2500 return result;
2501 }
2502
2503 // We need to ensure processor and memory resources have been properly
2504 // configured - which may rely on arguments we just processed - before
2505 // doing the final argument processing. Any argument processing that
2506 // needs to know about processor and memory resources must occur after
2507 // this point.
2508
2509 os::init_container_support();
2510
2511 // Do final processing now that all arguments have been parsed
2512 result = finalize_vm_init_args(patch_mod_javabase);
2513 if (result != JNI_OK) {
2514 return result;
2515 }
2516
2517 return JNI_OK;
2518 }
2519
2520 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2521 // represents a valid JDWP agent. is_path==true denotes that we
2522 // are dealing with -agentpath (case where name is a path), otherwise with
2523 // -agentlib
2524 bool valid_jdwp_agent(char *name, bool is_path) {
2525 char *_name;
2526 const char *_jdwp = "jdwp";
2527 size_t _len_jdwp, _len_prefix;
2528
2529 if (is_path) {
2530 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2531 return false;
2532 }
2533
2534 _name++; // skip past last path separator
2535 _len_prefix = strlen(JNI_LIB_PREFIX);
2536
2537 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2538 return false;
2539 }
2540
2541 _name += _len_prefix;
2542 _len_jdwp = strlen(_jdwp);
2543
2544 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2545 _name += _len_jdwp;
2546 }
2547 else {
2548 return false;
2549 }
2550
2551 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2552 return false;
2553 }
2554
2555 return true;
2556 }
2557
2558 if (strcmp(name, _jdwp) == 0) {
2559 return true;
2560 }
2561
2562 return false;
2563 }
2564
2565 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2566 // --patch-module=<module>=<file>(<pathsep><file>)*
2567 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2568 // Find the equal sign between the module name and the path specification
2569 const char* module_equal = strchr(patch_mod_tail, '=');
2570 if (module_equal == NULL) {
2571 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2572 return JNI_ERR;
2573 } else {
2574 // Pick out the module name
2575 size_t module_len = module_equal - patch_mod_tail;
2576 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2577 if (module_name != NULL) {
2578 memcpy(module_name, patch_mod_tail, module_len);
2579 *(module_name + module_len) = '\0';
2580 // The path piece begins one past the module_equal sign
2581 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2582 FREE_C_HEAP_ARRAY(char, module_name);
2583 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2584 return JNI_ENOMEM;
2585 }
2586 } else {
2587 return JNI_ENOMEM;
2588 }
2589 }
2590 return JNI_OK;
2591 }
2592
2593 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2594 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2595 // The min and max sizes match the values in globals.hpp, but scaled
2596 // with K. The values have been chosen so that alignment with page
2597 // size doesn't change the max value, which makes the conversions
2598 // back and forth between Xss value and ThreadStackSize value easier.
2599 // The values have also been chosen to fit inside a 32-bit signed type.
2600 const julong min_ThreadStackSize = 0;
2601 const julong max_ThreadStackSize = 1 * M;
2602
2603 const julong min_size = min_ThreadStackSize * K;
2604 const julong max_size = max_ThreadStackSize * K;
2605
2606 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2607
2608 julong size = 0;
2609 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2610 if (errcode != arg_in_range) {
2611 bool silent = (option == NULL); // Allow testing to silence error messages
2612 if (!silent) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Invalid thread stack size: %s\n", option->optionString);
2615 describe_range_error(errcode);
2616 }
2617 return JNI_EINVAL;
2618 }
2619
2620 // Internally track ThreadStackSize in units of 1024 bytes.
2621 const julong size_aligned = align_up(size, K);
2622 assert(size <= size_aligned,
2623 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2624 size, size_aligned);
2625
2626 const julong size_in_K = size_aligned / K;
2627 assert(size_in_K < (julong)max_intx,
2628 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2629 size_in_K);
2630
2631 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2632 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2633 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2634 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2635 max_expanded, size_in_K);
2636
2637 *out_ThreadStackSize = (intx)size_in_K;
2638
2639 return JNI_OK;
2640 }
2641
2642 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2643 // For match_option to return remaining or value part of option string
2644 const char* tail;
2645
2646 // iterate over arguments
2647 for (int index = 0; index < args->nOptions; index++) {
2648 bool is_absolute_path = false; // for -agentpath vs -agentlib
2649
2650 const JavaVMOption* option = args->options + index;
2651
2652 if (!match_option(option, "-Djava.class.path", &tail) &&
2653 !match_option(option, "-Dsun.java.command", &tail) &&
2654 !match_option(option, "-Dsun.java.launcher", &tail)) {
2655
2656 // add all jvm options to the jvm_args string. This string
2657 // is used later to set the java.vm.args PerfData string constant.
2658 // the -Djava.class.path and the -Dsun.java.command options are
2659 // omitted from jvm_args string as each have their own PerfData
2660 // string constant object.
2661 build_jvm_args(option->optionString);
2662 }
2663
2664 // -verbose:[class/module/gc/jni]
2665 if (match_option(option, "-verbose", &tail)) {
2666 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2667 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2668 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2669 } else if (!strcmp(tail, ":module")) {
2670 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2671 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2672 } else if (!strcmp(tail, ":gc")) {
2673 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2674 } else if (!strcmp(tail, ":jni")) {
2675 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 }
2679 // -da / -ea / -disableassertions / -enableassertions
2680 // These accept an optional class/package name separated by a colon, e.g.,
2681 // -da:java.lang.Thread.
2682 } else if (match_option(option, user_assertion_options, &tail, true)) {
2683 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2684 if (*tail == '\0') {
2685 JavaAssertions::setUserClassDefault(enable);
2686 } else {
2687 assert(*tail == ':', "bogus match by match_option()");
2688 JavaAssertions::addOption(tail + 1, enable);
2689 }
2690 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2691 } else if (match_option(option, system_assertion_options, &tail, false)) {
2692 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2693 JavaAssertions::setSystemClassDefault(enable);
2694 // -bootclasspath:
2695 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2696 jio_fprintf(defaultStream::output_stream(),
2697 "-Xbootclasspath is no longer a supported option.\n");
2698 return JNI_EINVAL;
2699 // -bootclasspath/a:
2700 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2701 Arguments::append_sysclasspath(tail);
2702 // -bootclasspath/p:
2703 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2704 jio_fprintf(defaultStream::output_stream(),
2705 "-Xbootclasspath/p is no longer a supported option.\n");
2706 return JNI_EINVAL;
2707 // -Xrun
2708 } else if (match_option(option, "-Xrun", &tail)) {
2709 if (tail != NULL) {
2710 const char* pos = strchr(tail, ':');
2711 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2712 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2713 jio_snprintf(name, len + 1, "%s", tail);
2714
2715 char *options = NULL;
2716 if(pos != NULL) {
2717 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2718 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2719 }
2720 #if !INCLUDE_JVMTI
2721 if (strcmp(name, "jdwp") == 0) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "Debugging agents are not supported in this VM\n");
2724 return JNI_ERR;
2725 }
2726 #endif // !INCLUDE_JVMTI
2727 add_init_library(name, options);
2728 }
2729 } else if (match_option(option, "--add-reads=", &tail)) {
2730 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2731 return JNI_ENOMEM;
2732 }
2733 } else if (match_option(option, "--add-exports=", &tail)) {
2734 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2735 return JNI_ENOMEM;
2736 }
2737 } else if (match_option(option, "--add-opens=", &tail)) {
2738 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2739 return JNI_ENOMEM;
2740 }
2741 } else if (match_option(option, "--add-modules=", &tail)) {
2742 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2743 return JNI_ENOMEM;
2744 }
2745 } else if (match_option(option, "--limit-modules=", &tail)) {
2746 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2747 return JNI_ENOMEM;
2748 }
2749 } else if (match_option(option, "--module-path=", &tail)) {
2750 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2751 return JNI_ENOMEM;
2752 }
2753 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2754 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2755 return JNI_ENOMEM;
2756 }
2757 } else if (match_option(option, "--patch-module=", &tail)) {
2758 // --patch-module=<module>=<file>(<pathsep><file>)*
2759 int res = process_patch_mod_option(tail, patch_mod_javabase);
2760 if (res != JNI_OK) {
2761 return res;
2762 }
2763 } else if (match_option(option, "--illegal-access=", &tail)) {
2764 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2765 return JNI_ENOMEM;
2766 }
2767 // -agentlib and -agentpath
2768 } else if (match_option(option, "-agentlib:", &tail) ||
2769 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2770 if(tail != NULL) {
2771 const char* pos = strchr(tail, '=');
2772 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2773 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2774 name[len] = '\0';
2775
2776 char *options = NULL;
2777 if(pos != NULL) {
2778 options = os::strdup_check_oom(pos + 1, mtArguments);
2779 }
2780 #if !INCLUDE_JVMTI
2781 if (valid_jdwp_agent(name, is_absolute_path)) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Debugging agents are not supported in this VM\n");
2784 return JNI_ERR;
2785 }
2786 #endif // !INCLUDE_JVMTI
2787 add_init_agent(name, options, is_absolute_path);
2788 }
2789 // -javaagent
2790 } else if (match_option(option, "-javaagent:", &tail)) {
2791 #if !INCLUDE_JVMTI
2792 jio_fprintf(defaultStream::error_stream(),
2793 "Instrumentation agents are not supported in this VM\n");
2794 return JNI_ERR;
2795 #else
2796 if (tail != NULL) {
2797 size_t length = strlen(tail) + 1;
2798 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2799 jio_snprintf(options, length, "%s", tail);
2800 add_instrument_agent("instrument", options, false);
2801 // java agents need module java.instrument
2802 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2803 return JNI_ENOMEM;
2804 }
2805 }
2806 #endif // !INCLUDE_JVMTI
2807 // -Xnoclassgc
2808 } else if (match_option(option, "-Xnoclassgc")) {
2809 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 // -Xconcgc
2813 } else if (match_option(option, "-Xconcgc")) {
2814 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2818 // -Xnoconcgc
2819 } else if (match_option(option, "-Xnoconcgc")) {
2820 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2824 // -Xbatch
2825 } else if (match_option(option, "-Xbatch")) {
2826 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829 // -Xmn for compatibility with other JVM vendors
2830 } else if (match_option(option, "-Xmn", &tail)) {
2831 julong long_initial_young_size = 0;
2832 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2833 if (errcode != arg_in_range) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Invalid initial young generation size: %s\n", option->optionString);
2836 describe_range_error(errcode);
2837 return JNI_EINVAL;
2838 }
2839 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2840 return JNI_EINVAL;
2841 }
2842 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 // -Xms
2846 } else if (match_option(option, "-Xms", &tail)) {
2847 julong long_initial_heap_size = 0;
2848 // an initial heap size of 0 means automatically determine
2849 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid initial heap size: %s\n", option->optionString);
2853 describe_range_error(errcode);
2854 return JNI_EINVAL;
2855 }
2856 set_min_heap_size((size_t)long_initial_heap_size);
2857 // Currently the minimum size and the initial heap sizes are the same.
2858 // Can be overridden with -XX:InitialHeapSize.
2859 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 // -Xmx
2863 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2864 julong long_max_heap_size = 0;
2865 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2866 if (errcode != arg_in_range) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Invalid maximum heap size: %s\n", option->optionString);
2869 describe_range_error(errcode);
2870 return JNI_EINVAL;
2871 }
2872 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 // Xmaxf
2876 } else if (match_option(option, "-Xmaxf", &tail)) {
2877 char* err;
2878 int maxf = (int)(strtod(tail, &err) * 100);
2879 if (*err != '\0' || *tail == '\0') {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Bad max heap free percentage size: %s\n",
2882 option->optionString);
2883 return JNI_EINVAL;
2884 } else {
2885 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 }
2889 // Xminf
2890 } else if (match_option(option, "-Xminf", &tail)) {
2891 char* err;
2892 int minf = (int)(strtod(tail, &err) * 100);
2893 if (*err != '\0' || *tail == '\0') {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Bad min heap free percentage size: %s\n",
2896 option->optionString);
2897 return JNI_EINVAL;
2898 } else {
2899 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 }
2903 // -Xss
2904 } else if (match_option(option, "-Xss", &tail)) {
2905 intx value = 0;
2906 jint err = parse_xss(option, tail, &value);
2907 if (err != JNI_OK) {
2908 return err;
2909 }
2910 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2914 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2915 julong long_ReservedCodeCacheSize = 0;
2916
2917 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2918 if (errcode != arg_in_range) {
2919 jio_fprintf(defaultStream::error_stream(),
2920 "Invalid maximum code cache size: %s.\n", option->optionString);
2921 return JNI_EINVAL;
2922 }
2923 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 // -green
2927 } else if (match_option(option, "-green")) {
2928 jio_fprintf(defaultStream::error_stream(),
2929 "Green threads support not available\n");
2930 return JNI_EINVAL;
2931 // -native
2932 } else if (match_option(option, "-native")) {
2933 // HotSpot always uses native threads, ignore silently for compatibility
2934 // -Xrs
2935 } else if (match_option(option, "-Xrs")) {
2936 // Classic/EVM option, new functionality
2937 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 // -Xprof
2941 } else if (match_option(option, "-Xprof")) {
2942 char version[256];
2943 // Obsolete in JDK 10
2944 JDK_Version::jdk(10).to_string(version, sizeof(version));
2945 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2946 // -Xconcurrentio
2947 } else if (match_option(option, "-Xconcurrentio")) {
2948 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2955 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2959 return JNI_EINVAL;
2960 }
2961
2962 // -Xinternalversion
2963 } else if (match_option(option, "-Xinternalversion")) {
2964 jio_fprintf(defaultStream::output_stream(), "%s\n",
2965 VM_Version::internal_vm_info_string());
2966 vm_exit(0);
2967 #ifndef PRODUCT
2968 // -Xprintflags
2969 } else if (match_option(option, "-Xprintflags")) {
2970 CommandLineFlags::printFlags(tty, false);
2971 vm_exit(0);
2972 #endif
2973 // -D
2974 } else if (match_option(option, "-D", &tail)) {
2975 const char* value;
2976 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2977 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2978 // abort if -Djava.endorsed.dirs is set
2979 jio_fprintf(defaultStream::output_stream(),
2980 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2981 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2982 return JNI_EINVAL;
2983 }
2984 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2985 *value != '\0' && strcmp(value, "\"\"") != 0) {
2986 // abort if -Djava.ext.dirs is set
2987 jio_fprintf(defaultStream::output_stream(),
2988 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2989 return JNI_EINVAL;
2990 }
2991 // Check for module related properties. They must be set using the modules
2992 // options. For example: use "--add-modules=java.sql", not
2993 // "-Djdk.module.addmods=java.sql"
2994 if (is_internal_module_property(option->optionString + 2)) {
2995 needs_module_property_warning = true;
2996 continue;
2997 }
2998
2999 if (!add_property(tail)) {
3000 return JNI_ENOMEM;
3001 }
3002 // Out of the box management support
3003 if (match_option(option, "-Dcom.sun.management", &tail)) {
3004 #if INCLUDE_MANAGEMENT
3005 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 // management agent in module jdk.management.agent
3009 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3010 return JNI_ENOMEM;
3011 }
3012 #else
3013 jio_fprintf(defaultStream::output_stream(),
3014 "-Dcom.sun.management is not supported in this VM.\n");
3015 return JNI_ERR;
3016 #endif
3017 }
3018 // -Xint
3019 } else if (match_option(option, "-Xint")) {
3020 set_mode_flags(_int);
3021 // -Xmixed
3022 } else if (match_option(option, "-Xmixed")) {
3023 set_mode_flags(_mixed);
3024 // -Xcomp
3025 } else if (match_option(option, "-Xcomp")) {
3026 // for testing the compiler; turn off all flags that inhibit compilation
3027 set_mode_flags(_comp);
3028 // -Xshare:dump
3029 } else if (match_option(option, "-Xshare:dump")) {
3030 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033 set_mode_flags(_int); // Prevent compilation, which creates objects
3034 // -Xshare:on
3035 } else if (match_option(option, "-Xshare:on")) {
3036 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 // -Xshare:auto
3043 } else if (match_option(option, "-Xshare:auto")) {
3044 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3045 return JNI_EINVAL;
3046 }
3047 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 // -Xshare:off
3051 } else if (match_option(option, "-Xshare:off")) {
3052 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3056 return JNI_EINVAL;
3057 }
3058 // -Xverify
3059 } else if (match_option(option, "-Xverify", &tail)) {
3060 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3061 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3065 return JNI_EINVAL;
3066 }
3067 } else if (strcmp(tail, ":remote") == 0) {
3068 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3069 return JNI_EINVAL;
3070 }
3071 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 } else if (strcmp(tail, ":none") == 0) {
3075 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3076 return JNI_EINVAL;
3077 }
3078 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3079 return JNI_EINVAL;
3080 }
3081 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3082 return JNI_EINVAL;
3083 }
3084 // -Xdebug
3085 } else if (match_option(option, "-Xdebug")) {
3086 // note this flag has been used, then ignore
3087 set_xdebug_mode(true);
3088 // -Xnoagent
3089 } else if (match_option(option, "-Xnoagent")) {
3090 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3091 } else if (match_option(option, "-Xloggc:", &tail)) {
3092 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3093 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3094 _gc_log_filename = os::strdup_check_oom(tail);
3095 } else if (match_option(option, "-Xlog", &tail)) {
3096 bool ret = false;
3097 if (strcmp(tail, ":help") == 0) {
3098 fileStream stream(defaultStream::output_stream());
3099 LogConfiguration::print_command_line_help(&stream);
3100 vm_exit(0);
3101 } else if (strcmp(tail, ":disable") == 0) {
3102 LogConfiguration::disable_logging();
3103 ret = true;
3104 } else if (*tail == '\0') {
3105 ret = LogConfiguration::parse_command_line_arguments();
3106 assert(ret, "-Xlog without arguments should never fail to parse");
3107 } else if (*tail == ':') {
3108 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3109 }
3110 if (ret == false) {
3111 jio_fprintf(defaultStream::error_stream(),
3112 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
3113 tail);
3114 return JNI_EINVAL;
3115 }
3116 // JNI hooks
3117 } else if (match_option(option, "-Xcheck", &tail)) {
3118 if (!strcmp(tail, ":jni")) {
3119 #if !INCLUDE_JNI_CHECK
3120 warning("JNI CHECKING is not supported in this VM");
3121 #else
3122 CheckJNICalls = true;
3123 #endif // INCLUDE_JNI_CHECK
3124 } else if (is_bad_option(option, args->ignoreUnrecognized,
3125 "check")) {
3126 return JNI_EINVAL;
3127 }
3128 } else if (match_option(option, "vfprintf")) {
3129 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3130 } else if (match_option(option, "exit")) {
3131 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3132 } else if (match_option(option, "abort")) {
3133 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3134 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3135 // and the last option wins.
3136 } else if (match_option(option, "-XX:+NeverTenure")) {
3137 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3138 return JNI_EINVAL;
3139 }
3140 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3141 return JNI_EINVAL;
3142 }
3143 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3144 return JNI_EINVAL;
3145 }
3146 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3147 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3148 return JNI_EINVAL;
3149 }
3150 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3151 return JNI_EINVAL;
3152 }
3153 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3154 return JNI_EINVAL;
3155 }
3156 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3157 uintx max_tenuring_thresh = 0;
3158 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3159 jio_fprintf(defaultStream::error_stream(),
3160 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3161 return JNI_EINVAL;
3162 }
3163
3164 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3165 return JNI_EINVAL;
3166 }
3167
3168 if (MaxTenuringThreshold == 0) {
3169 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3170 return JNI_EINVAL;
3171 }
3172 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3173 return JNI_EINVAL;
3174 }
3175 } else {
3176 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3180 return JNI_EINVAL;
3181 }
3182 }
3183 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3184 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3188 return JNI_EINVAL;
3189 }
3190 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3191 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3198 #if defined(DTRACE_ENABLED)
3199 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3200 return JNI_EINVAL;
3201 }
3202 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3203 return JNI_EINVAL;
3204 }
3205 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3206 return JNI_EINVAL;
3207 }
3208 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 #else // defined(DTRACE_ENABLED)
3212 jio_fprintf(defaultStream::error_stream(),
3213 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3214 return JNI_EINVAL;
3215 #endif // defined(DTRACE_ENABLED)
3216 #ifdef ASSERT
3217 } else if (match_option(option, "-XX:+FullGCALot")) {
3218 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3219 return JNI_EINVAL;
3220 }
3221 // disable scavenge before parallel mark-compact
3222 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3223 return JNI_EINVAL;
3224 }
3225 #endif
3226 #if !INCLUDE_MANAGEMENT
3227 } else if (match_option(option, "-XX:+ManagementServer")) {
3228 jio_fprintf(defaultStream::error_stream(),
3229 "ManagementServer is not supported in this VM.\n");
3230 return JNI_ERR;
3231 #endif // INCLUDE_MANAGEMENT
3232 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3233 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3234 // already been handled
3235 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3236 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3237 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3238 return JNI_EINVAL;
3239 }
3240 }
3241 // Unknown option
3242 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3243 return JNI_ERR;
3244 }
3245 }
3246
3247 // PrintSharedArchiveAndExit will turn on
3248 // -Xshare:on
3249 // -Xlog:class+path=info
3250 if (PrintSharedArchiveAndExit) {
3251 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3252 return JNI_EINVAL;
3253 }
3254 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3255 return JNI_EINVAL;
3256 }
3257 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3258 }
3259
3260 // Change the default value for flags which have different default values
3261 // when working with older JDKs.
3262 #ifdef LINUX
3263 if (JDK_Version::current().compare_major(6) <= 0 &&
3264 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3265 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3266 }
3267 #endif // LINUX
3268 fix_appclasspath();
3269 return JNI_OK;
3270 }
3271
3272 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3273 // For java.base check for duplicate --patch-module options being specified on the command line.
3274 // This check is only required for java.base, all other duplicate module specifications
3275 // will be checked during module system initialization. The module system initialization
3276 // will throw an ExceptionInInitializerError if this situation occurs.
3277 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3278 if (*patch_mod_javabase) {
3279 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3280 } else {
3281 *patch_mod_javabase = true;
3282 }
3283 }
3284
3285 // Create GrowableArray lazily, only if --patch-module has been specified
3286 if (_patch_mod_prefix == NULL) {
3287 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3288 }
3289
3290 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3291 }
3292
3293 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3294 //
3295 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3296 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3297 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3298 // path is treated as the current directory.
3299 //
3300 // This causes problems with CDS, which requires that all directories specified in the classpath
3301 // must be empty. In most cases, applications do NOT want to load classes from the current
3302 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3303 // scripts compatible with CDS.
3304 void Arguments::fix_appclasspath() {
3305 if (IgnoreEmptyClassPaths) {
3306 const char separator = *os::path_separator();
3307 const char* src = _java_class_path->value();
3308
3309 // skip over all the leading empty paths
3310 while (*src == separator) {
3311 src ++;
3312 }
3313
3314 char* copy = os::strdup_check_oom(src, mtArguments);
3315
3316 // trim all trailing empty paths
3317 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3318 *tail = '\0';
3319 }
3320
3321 char from[3] = {separator, separator, '\0'};
3322 char to [2] = {separator, '\0'};
3323 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3324 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3325 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3326 }
3327
3328 _java_class_path->set_writeable_value(copy);
3329 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3330 }
3331 }
3332
3333 static bool has_jar_files(const char* directory) {
3334 DIR* dir = os::opendir(directory);
3335 if (dir == NULL) return false;
3336
3337 struct dirent *entry;
3338 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3339 bool hasJarFile = false;
3340 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3341 const char* name = entry->d_name;
3342 const char* ext = name + strlen(name) - 4;
3343 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3344 }
3345 FREE_C_HEAP_ARRAY(char, dbuf);
3346 os::closedir(dir);
3347 return hasJarFile ;
3348 }
3349
3350 static int check_non_empty_dirs(const char* path) {
3351 const char separator = *os::path_separator();
3352 const char* const end = path + strlen(path);
3353 int nonEmptyDirs = 0;
3354 while (path < end) {
3355 const char* tmp_end = strchr(path, separator);
3356 if (tmp_end == NULL) {
3357 if (has_jar_files(path)) {
3358 nonEmptyDirs++;
3359 jio_fprintf(defaultStream::output_stream(),
3360 "Non-empty directory: %s\n", path);
3361 }
3362 path = end;
3363 } else {
3364 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3365 memcpy(dirpath, path, tmp_end - path);
3366 dirpath[tmp_end - path] = '\0';
3367 if (has_jar_files(dirpath)) {
3368 nonEmptyDirs++;
3369 jio_fprintf(defaultStream::output_stream(),
3370 "Non-empty directory: %s\n", dirpath);
3371 }
3372 FREE_C_HEAP_ARRAY(char, dirpath);
3373 path = tmp_end + 1;
3374 }
3375 }
3376 return nonEmptyDirs;
3377 }
3378
3379 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3380 // check if the default lib/endorsed directory exists; if so, error
3381 char path[JVM_MAXPATHLEN];
3382 const char* fileSep = os::file_separator();
3383 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3384
3385 if (CheckEndorsedAndExtDirs) {
3386 int nonEmptyDirs = 0;
3387 // check endorsed directory
3388 nonEmptyDirs += check_non_empty_dirs(path);
3389 // check the extension directories
3390 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3391 if (nonEmptyDirs > 0) {
3392 return JNI_ERR;
3393 }
3394 }
3395
3396 DIR* dir = os::opendir(path);
3397 if (dir != NULL) {
3398 jio_fprintf(defaultStream::output_stream(),
3399 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3400 "in modular form will be supported via the concept of upgradeable modules.\n");
3401 os::closedir(dir);
3402 return JNI_ERR;
3403 }
3404
3405 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3406 dir = os::opendir(path);
3407 if (dir != NULL) {
3408 jio_fprintf(defaultStream::output_stream(),
3409 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3410 "Use -classpath instead.\n.");
3411 os::closedir(dir);
3412 return JNI_ERR;
3413 }
3414
3415 // This must be done after all arguments have been processed
3416 // and the container support has been initialized since AggressiveHeap
3417 // relies on the amount of total memory available.
3418 if (AggressiveHeap) {
3419 jint result = set_aggressive_heap_flags();
3420 if (result != JNI_OK) {
3421 return result;
3422 }
3423 }
3424
3425 // This must be done after all arguments have been processed.
3426 // java_compiler() true means set to "NONE" or empty.
3427 if (java_compiler() && !xdebug_mode()) {
3428 // For backwards compatibility, we switch to interpreted mode if
3429 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3430 // not specified.
3431 set_mode_flags(_int);
3432 }
3433
3434 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3435 // but like -Xint, leave compilation thresholds unaffected.
3436 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3437 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3438 set_mode_flags(_int);
3439 }
3440
3441 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3442 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3443 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3444 }
3445
3446 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3447 // Don't degrade server performance for footprint
3448 if (FLAG_IS_DEFAULT(UseLargePages) &&
3449 MaxHeapSize < LargePageHeapSizeThreshold) {
3450 // No need for large granularity pages w/small heaps.
3451 // Note that large pages are enabled/disabled for both the
3452 // Java heap and the code cache.
3453 FLAG_SET_DEFAULT(UseLargePages, false);
3454 }
3455
3456 #elif defined(COMPILER2)
3457 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3458 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3459 }
3460 #endif
3461
3462 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3463 UNSUPPORTED_OPTION(ProfileInterpreter);
3464 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3465 #endif
3466
3467 #ifndef TIERED
3468 // Tiered compilation is undefined.
3469 UNSUPPORTED_OPTION(TieredCompilation);
3470 #endif
3471
3472 #if INCLUDE_JVMCI
3473 if (EnableJVMCI &&
3474 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3475 return JNI_ENOMEM;
3476 }
3477 #endif
3478
3479 if (!check_vm_args_consistency()) {
3480 return JNI_ERR;
3481 }
3482
3483 #if INCLUDE_JVMCI
3484 if (UseJVMCICompiler) {
3485 Compilation_mode = CompMode_server;
3486 }
3487 #endif
3488
3489 #if INCLUDE_CDS
3490 if (DumpSharedSpaces) {
3491 // Disable biased locking now as it interferes with the clean up of
3492 // the archived Klasses and Java string objects (at dump time only).
3493 UseBiasedLocking = false;
3494 }
3495 if (UseSharedSpaces && patch_mod_javabase) {
3496 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3497 }
3498 #endif
3499
3500 return JNI_OK;
3501 }
3502
3503 // Helper class for controlling the lifetime of JavaVMInitArgs
3504 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3505 // deleted on the destruction of the ScopedVMInitArgs object.
3506 class ScopedVMInitArgs : public StackObj {
3507 private:
3508 JavaVMInitArgs _args;
3509 char* _container_name;
3510 bool _is_set;
3511 char* _vm_options_file_arg;
3512
3513 public:
3514 ScopedVMInitArgs(const char *container_name) {
3515 _args.version = JNI_VERSION_1_2;
3516 _args.nOptions = 0;
3517 _args.options = NULL;
3518 _args.ignoreUnrecognized = false;
3519 _container_name = (char *)container_name;
3520 _is_set = false;
3521 _vm_options_file_arg = NULL;
3522 }
3523
3524 // Populates the JavaVMInitArgs object represented by this
3525 // ScopedVMInitArgs object with the arguments in options. The
3526 // allocated memory is deleted by the destructor. If this method
3527 // returns anything other than JNI_OK, then this object is in a
3528 // partially constructed state, and should be abandoned.
3529 jint set_args(GrowableArray<JavaVMOption>* options) {
3530 _is_set = true;
3531 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3532 JavaVMOption, options->length(), mtArguments);
3533 if (options_arr == NULL) {
3534 return JNI_ENOMEM;
3535 }
3536 _args.options = options_arr;
3537
3538 for (int i = 0; i < options->length(); i++) {
3539 options_arr[i] = options->at(i);
3540 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3541 if (options_arr[i].optionString == NULL) {
3542 // Rely on the destructor to do cleanup.
3543 _args.nOptions = i;
3544 return JNI_ENOMEM;
3545 }
3546 }
3547
3548 _args.nOptions = options->length();
3549 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3550 return JNI_OK;
3551 }
3552
3553 JavaVMInitArgs* get() { return &_args; }
3554 char* container_name() { return _container_name; }
3555 bool is_set() { return _is_set; }
3556 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3557 char* vm_options_file_arg() { return _vm_options_file_arg; }
3558
3559 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3560 if (_vm_options_file_arg != NULL) {
3561 os::free(_vm_options_file_arg);
3562 }
3563 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3564 }
3565
3566 ~ScopedVMInitArgs() {
3567 if (_vm_options_file_arg != NULL) {
3568 os::free(_vm_options_file_arg);
3569 }
3570 if (_args.options == NULL) return;
3571 for (int i = 0; i < _args.nOptions; i++) {
3572 os::free(_args.options[i].optionString);
3573 }
3574 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3575 }
3576
3577 // Insert options into this option list, to replace option at
3578 // vm_options_file_pos (-XX:VMOptionsFile)
3579 jint insert(const JavaVMInitArgs* args,
3580 const JavaVMInitArgs* args_to_insert,
3581 const int vm_options_file_pos) {
3582 assert(_args.options == NULL, "shouldn't be set yet");
3583 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3584 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3585
3586 int length = args->nOptions + args_to_insert->nOptions - 1;
3587 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3588 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3589 for (int i = 0; i < args->nOptions; i++) {
3590 if (i == vm_options_file_pos) {
3591 // insert the new options starting at the same place as the
3592 // -XX:VMOptionsFile option
3593 for (int j = 0; j < args_to_insert->nOptions; j++) {
3594 options->push(args_to_insert->options[j]);
3595 }
3596 } else {
3597 options->push(args->options[i]);
3598 }
3599 }
3600 // make into options array
3601 jint result = set_args(options);
3602 delete options;
3603 return result;
3604 }
3605 };
3606
3607 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3608 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3609 }
3610
3611 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3612 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3613 }
3614
3615 jint Arguments::parse_options_environment_variable(const char* name,
3616 ScopedVMInitArgs* vm_args) {
3617 char *buffer = ::getenv(name);
3618
3619 // Don't check this environment variable if user has special privileges
3620 // (e.g. unix su command).
3621 if (buffer == NULL || os::have_special_privileges()) {
3622 return JNI_OK;
3623 }
3624
3625 if ((buffer = os::strdup(buffer)) == NULL) {
3626 return JNI_ENOMEM;
3627 }
3628
3629 jio_fprintf(defaultStream::error_stream(),
3630 "Picked up %s: %s\n", name, buffer);
3631
3632 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3633
3634 os::free(buffer);
3635 return retcode;
3636 }
3637
3638 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3639 // read file into buffer
3640 int fd = ::open(file_name, O_RDONLY);
3641 if (fd < 0) {
3642 jio_fprintf(defaultStream::error_stream(),
3643 "Could not open options file '%s'\n",
3644 file_name);
3645 return JNI_ERR;
3646 }
3647
3648 struct stat stbuf;
3649 int retcode = os::stat(file_name, &stbuf);
3650 if (retcode != 0) {
3651 jio_fprintf(defaultStream::error_stream(),
3652 "Could not stat options file '%s'\n",
3653 file_name);
3654 os::close(fd);
3655 return JNI_ERR;
3656 }
3657
3658 if (stbuf.st_size == 0) {
3659 // tell caller there is no option data and that is ok
3660 os::close(fd);
3661 return JNI_OK;
3662 }
3663
3664 // '+ 1' for NULL termination even with max bytes
3665 size_t bytes_alloc = stbuf.st_size + 1;
3666
3667 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3668 if (NULL == buf) {
3669 jio_fprintf(defaultStream::error_stream(),
3670 "Could not allocate read buffer for options file parse\n");
3671 os::close(fd);
3672 return JNI_ENOMEM;
3673 }
3674
3675 memset(buf, 0, bytes_alloc);
3676
3677 // Fill buffer
3678 // Use ::read() instead of os::read because os::read()
3679 // might do a thread state transition
3680 // and it is too early for that here
3681
3682 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3683 os::close(fd);
3684 if (bytes_read < 0) {
3685 FREE_C_HEAP_ARRAY(char, buf);
3686 jio_fprintf(defaultStream::error_stream(),
3687 "Could not read options file '%s'\n", file_name);
3688 return JNI_ERR;
3689 }
3690
3691 if (bytes_read == 0) {
3692 // tell caller there is no option data and that is ok
3693 FREE_C_HEAP_ARRAY(char, buf);
3694 return JNI_OK;
3695 }
3696
3697 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3698
3699 FREE_C_HEAP_ARRAY(char, buf);
3700 return retcode;
3701 }
3702
3703 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3704 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3705
3706 // some pointers to help with parsing
3707 char *buffer_end = buffer + buf_len;
3708 char *opt_hd = buffer;
3709 char *wrt = buffer;
3710 char *rd = buffer;
3711
3712 // parse all options
3713 while (rd < buffer_end) {
3714 // skip leading white space from the input string
3715 while (rd < buffer_end && isspace(*rd)) {
3716 rd++;
3717 }
3718
3719 if (rd >= buffer_end) {
3720 break;
3721 }
3722
3723 // Remember this is where we found the head of the token.
3724 opt_hd = wrt;
3725
3726 // Tokens are strings of non white space characters separated
3727 // by one or more white spaces.
3728 while (rd < buffer_end && !isspace(*rd)) {
3729 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3730 int quote = *rd; // matching quote to look for
3731 rd++; // don't copy open quote
3732 while (rd < buffer_end && *rd != quote) {
3733 // include everything (even spaces)
3734 // up until the close quote
3735 *wrt++ = *rd++; // copy to option string
3736 }
3737
3738 if (rd < buffer_end) {
3739 rd++; // don't copy close quote
3740 } else {
3741 // did not see closing quote
3742 jio_fprintf(defaultStream::error_stream(),
3743 "Unmatched quote in %s\n", name);
3744 delete options;
3745 return JNI_ERR;
3746 }
3747 } else {
3748 *wrt++ = *rd++; // copy to option string
3749 }
3750 }
3751
3752 // steal a white space character and set it to NULL
3753 *wrt++ = '\0';
3754 // We now have a complete token
3755
3756 JavaVMOption option;
3757 option.optionString = opt_hd;
3758 option.extraInfo = NULL;
3759
3760 options->append(option); // Fill in option
3761
3762 rd++; // Advance to next character
3763 }
3764
3765 // Fill out JavaVMInitArgs structure.
3766 jint status = vm_args->set_args(options);
3767
3768 delete options;
3769 return status;
3770 }
3771
3772 void Arguments::set_shared_spaces_flags() {
3773 if (DumpSharedSpaces) {
3774 if (FailOverToOldVerifier) {
3775 // Don't fall back to the old verifier on verification failure. If a
3776 // class fails verification with the split verifier, it might fail the
3777 // CDS runtime verifier constraint check. In that case, we don't want
3778 // to share the class. We only archive classes that pass the split verifier.
3779 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3780 }
3781
3782 if (RequireSharedSpaces) {
3783 warning("Cannot dump shared archive while using shared archive");
3784 }
3785 UseSharedSpaces = false;
3786 #ifdef _LP64
3787 if (!UseCompressedOops || !UseCompressedClassPointers) {
3788 vm_exit_during_initialization(
3789 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3790 }
3791 } else {
3792 if (!UseCompressedOops || !UseCompressedClassPointers) {
3793 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3794 }
3795 #endif
3796 }
3797 }
3798
3799 // Sharing support
3800 // Construct the path to the archive
3801 static char* get_shared_archive_path() {
3802 char *shared_archive_path;
3803 if (SharedArchiveFile == NULL) {
3804 char jvm_path[JVM_MAXPATHLEN];
3805 os::jvm_path(jvm_path, sizeof(jvm_path));
3806 char *end = strrchr(jvm_path, *os::file_separator());
3807 if (end != NULL) *end = '\0';
3808 size_t jvm_path_len = strlen(jvm_path);
3809 size_t file_sep_len = strlen(os::file_separator());
3810 const size_t len = jvm_path_len + file_sep_len + 20;
3811 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3812 if (shared_archive_path != NULL) {
3813 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3814 jvm_path, os::file_separator());
3815 }
3816 } else {
3817 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3818 }
3819 return shared_archive_path;
3820 }
3821
3822 #ifndef PRODUCT
3823 // Determine whether LogVMOutput should be implicitly turned on.
3824 static bool use_vm_log() {
3825 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3826 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3827 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3828 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3829 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3830 return true;
3831 }
3832
3833 #ifdef COMPILER1
3834 if (PrintC1Statistics) {
3835 return true;
3836 }
3837 #endif // COMPILER1
3838
3839 #ifdef COMPILER2
3840 if (PrintOptoAssembly || PrintOptoStatistics) {
3841 return true;
3842 }
3843 #endif // COMPILER2
3844
3845 return false;
3846 }
3847
3848 #endif // PRODUCT
3849
3850 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3851 for (int index = 0; index < args->nOptions; index++) {
3852 const JavaVMOption* option = args->options + index;
3853 const char* tail;
3854 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3855 return true;
3856 }
3857 }
3858 return false;
3859 }
3860
3861 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3862 const char* vm_options_file,
3863 const int vm_options_file_pos,
3864 ScopedVMInitArgs* vm_options_file_args,
3865 ScopedVMInitArgs* args_out) {
3866 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3867 if (code != JNI_OK) {
3868 return code;
3869 }
3870
3871 if (vm_options_file_args->get()->nOptions < 1) {
3872 return JNI_OK;
3873 }
3874
3875 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3876 jio_fprintf(defaultStream::error_stream(),
3877 "A VM options file may not refer to a VM options file. "
3878 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3879 "options file '%s' in options container '%s' is an error.\n",
3880 vm_options_file_args->vm_options_file_arg(),
3881 vm_options_file_args->container_name());
3882 return JNI_EINVAL;
3883 }
3884
3885 return args_out->insert(args, vm_options_file_args->get(),
3886 vm_options_file_pos);
3887 }
3888
3889 // Expand -XX:VMOptionsFile found in args_in as needed.
3890 // mod_args and args_out parameters may return values as needed.
3891 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3892 ScopedVMInitArgs* mod_args,
3893 JavaVMInitArgs** args_out) {
3894 jint code = match_special_option_and_act(args_in, mod_args);
3895 if (code != JNI_OK) {
3896 return code;
3897 }
3898
3899 if (mod_args->is_set()) {
3900 // args_in contains -XX:VMOptionsFile and mod_args contains the
3901 // original options from args_in along with the options expanded
3902 // from the VMOptionsFile. Return a short-hand to the caller.
3903 *args_out = mod_args->get();
3904 } else {
3905 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3906 }
3907 return JNI_OK;
3908 }
3909
3910 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3911 ScopedVMInitArgs* args_out) {
3912 // Remaining part of option string
3913 const char* tail;
3914 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3915
3916 for (int index = 0; index < args->nOptions; index++) {
3917 const JavaVMOption* option = args->options + index;
3918 if (ArgumentsExt::process_options(option)) {
3919 continue;
3920 }
3921 if (match_option(option, "-XX:Flags=", &tail)) {
3922 Arguments::set_jvm_flags_file(tail);
3923 continue;
3924 }
3925 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3926 if (vm_options_file_args.found_vm_options_file_arg()) {
3927 jio_fprintf(defaultStream::error_stream(),
3928 "The option '%s' is already specified in the options "
3929 "container '%s' so the specification of '%s' in the "
3930 "same options container is an error.\n",
3931 vm_options_file_args.vm_options_file_arg(),
3932 vm_options_file_args.container_name(),
3933 option->optionString);
3934 return JNI_EINVAL;
3935 }
3936 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3937 // If there's a VMOptionsFile, parse that
3938 jint code = insert_vm_options_file(args, tail, index,
3939 &vm_options_file_args, args_out);
3940 if (code != JNI_OK) {
3941 return code;
3942 }
3943 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3944 if (args_out->is_set()) {
3945 // The VMOptions file inserted some options so switch 'args'
3946 // to the new set of options, and continue processing which
3947 // preserves "last option wins" semantics.
3948 args = args_out->get();
3949 // The first option from the VMOptionsFile replaces the
3950 // current option. So we back track to process the
3951 // replacement option.
3952 index--;
3953 }
3954 continue;
3955 }
3956 if (match_option(option, "-XX:+PrintVMOptions")) {
3957 PrintVMOptions = true;
3958 continue;
3959 }
3960 if (match_option(option, "-XX:-PrintVMOptions")) {
3961 PrintVMOptions = false;
3962 continue;
3963 }
3964 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3965 IgnoreUnrecognizedVMOptions = true;
3966 continue;
3967 }
3968 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3969 IgnoreUnrecognizedVMOptions = false;
3970 continue;
3971 }
3972 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3973 CommandLineFlags::printFlags(tty, false);
3974 vm_exit(0);
3975 }
3976 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3977 #if INCLUDE_NMT
3978 // The launcher did not setup nmt environment variable properly.
3979 if (!MemTracker::check_launcher_nmt_support(tail)) {
3980 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3981 }
3982
3983 // Verify if nmt option is valid.
3984 if (MemTracker::verify_nmt_option()) {
3985 // Late initialization, still in single-threaded mode.
3986 if (MemTracker::tracking_level() >= NMT_summary) {
3987 MemTracker::init();
3988 }
3989 } else {
3990 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3991 }
3992 continue;
3993 #else
3994 jio_fprintf(defaultStream::error_stream(),
3995 "Native Memory Tracking is not supported in this VM\n");
3996 return JNI_ERR;
3997 #endif
3998 }
3999
4000 #ifndef PRODUCT
4001 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4002 CommandLineFlags::printFlags(tty, true);
4003 vm_exit(0);
4004 }
4005 #endif
4006
4007 if (match_option(option, "-XX:+UseAppCDS")) {
4008 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4009 if (flag->is_diagnostic()) {
4010 flag->clear_diagnostic();
4011 }
4012 continue;
4013 }
4014 }
4015 return JNI_OK;
4016 }
4017
4018 static void print_options(const JavaVMInitArgs *args) {
4019 const char* tail;
4020 for (int index = 0; index < args->nOptions; index++) {
4021 const JavaVMOption *option = args->options + index;
4022 if (match_option(option, "-XX:", &tail)) {
4023 logOption(tail);
4024 }
4025 }
4026 }
4027
4028 bool Arguments::handle_deprecated_print_gc_flags() {
4029 if (PrintGC) {
4030 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4031 }
4032 if (PrintGCDetails) {
4033 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4034 }
4035
4036 if (_gc_log_filename != NULL) {
4037 // -Xloggc was used to specify a filename
4038 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4039
4040 LogTarget(Error, logging) target;
4041 LogStream errstream(target);
4042 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4043 } else if (PrintGC || PrintGCDetails) {
4044 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4045 }
4046 return true;
4047 }
4048
4049 void Arguments::handle_extra_cms_flags(const char* msg) {
4050 SpecialFlag flag;
4051 const char *flag_name = "UseConcMarkSweepGC";
4052 if (lookup_special_flag(flag_name, flag)) {
4053 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4054 warning("%s", msg);
4055 }
4056 }
4057
4058 // Parse entry point called from JNI_CreateJavaVM
4059
4060 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4061 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4062
4063 // Initialize ranges, constraints and writeables
4064 CommandLineFlagRangeList::init();
4065 CommandLineFlagConstraintList::init();
4066 CommandLineFlagWriteableList::init();
4067
4068 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4069 const char* hotspotrc = ".hotspotrc";
4070 bool settings_file_specified = false;
4071 bool needs_hotspotrc_warning = false;
4072 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4073 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4074
4075 // Pointers to current working set of containers
4076 JavaVMInitArgs* cur_cmd_args;
4077 JavaVMInitArgs* cur_java_options_args;
4078 JavaVMInitArgs* cur_java_tool_options_args;
4079
4080 // Containers for modified/expanded options
4081 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4082 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4083 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4084
4085
4086 jint code =
4087 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4088 if (code != JNI_OK) {
4089 return code;
4090 }
4091
4092 code = parse_java_options_environment_variable(&initial_java_options_args);
4093 if (code != JNI_OK) {
4094 return code;
4095 }
4096
4097 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4098 &mod_java_tool_options_args,
4099 &cur_java_tool_options_args);
4100 if (code != JNI_OK) {
4101 return code;
4102 }
4103
4104 code = expand_vm_options_as_needed(initial_cmd_args,
4105 &mod_cmd_args,
4106 &cur_cmd_args);
4107 if (code != JNI_OK) {
4108 return code;
4109 }
4110
4111 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4112 &mod_java_options_args,
4113 &cur_java_options_args);
4114 if (code != JNI_OK) {
4115 return code;
4116 }
4117
4118 const char* flags_file = Arguments::get_jvm_flags_file();
4119 settings_file_specified = (flags_file != NULL);
4120
4121 if (IgnoreUnrecognizedVMOptions) {
4122 cur_cmd_args->ignoreUnrecognized = true;
4123 cur_java_tool_options_args->ignoreUnrecognized = true;
4124 cur_java_options_args->ignoreUnrecognized = true;
4125 }
4126
4127 // Parse specified settings file
4128 if (settings_file_specified) {
4129 if (!process_settings_file(flags_file, true,
4130 cur_cmd_args->ignoreUnrecognized)) {
4131 return JNI_EINVAL;
4132 }
4133 } else {
4134 #ifdef ASSERT
4135 // Parse default .hotspotrc settings file
4136 if (!process_settings_file(".hotspotrc", false,
4137 cur_cmd_args->ignoreUnrecognized)) {
4138 return JNI_EINVAL;
4139 }
4140 #else
4141 struct stat buf;
4142 if (os::stat(hotspotrc, &buf) == 0) {
4143 needs_hotspotrc_warning = true;
4144 }
4145 #endif
4146 }
4147
4148 if (PrintVMOptions) {
4149 print_options(cur_java_tool_options_args);
4150 print_options(cur_cmd_args);
4151 print_options(cur_java_options_args);
4152 }
4153
4154 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4155 jint result = parse_vm_init_args(cur_java_tool_options_args,
4156 cur_java_options_args,
4157 cur_cmd_args);
4158
4159 if (result != JNI_OK) {
4160 return result;
4161 }
4162
4163 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4164 SharedArchivePath = get_shared_archive_path();
4165 if (SharedArchivePath == NULL) {
4166 return JNI_ENOMEM;
4167 }
4168
4169 // Set up VerifySharedSpaces
4170 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4171 VerifySharedSpaces = true;
4172 }
4173
4174 // Delay warning until here so that we've had a chance to process
4175 // the -XX:-PrintWarnings flag
4176 if (needs_hotspotrc_warning) {
4177 warning("%s file is present but has been ignored. "
4178 "Run with -XX:Flags=%s to load the file.",
4179 hotspotrc, hotspotrc);
4180 }
4181
4182 if (needs_module_property_warning) {
4183 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4184 " names that are reserved for internal use.");
4185 }
4186
4187 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4188 UNSUPPORTED_OPTION(UseLargePages);
4189 #endif
4190
4191 ArgumentsExt::report_unsupported_options();
4192
4193 #ifndef PRODUCT
4194 if (TraceBytecodesAt != 0) {
4195 TraceBytecodes = true;
4196 }
4197 if (CountCompiledCalls) {
4198 if (UseCounterDecay) {
4199 warning("UseCounterDecay disabled because CountCalls is set");
4200 UseCounterDecay = false;
4201 }
4202 }
4203 #endif // PRODUCT
4204
4205 if (ScavengeRootsInCode == 0) {
4206 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4207 warning("Forcing ScavengeRootsInCode non-zero");
4208 }
4209 ScavengeRootsInCode = 1;
4210 }
4211
4212 if (!handle_deprecated_print_gc_flags()) {
4213 return JNI_EINVAL;
4214 }
4215
4216 // Set object alignment values.
4217 set_object_alignment();
4218
4219 #if !INCLUDE_CDS
4220 if (DumpSharedSpaces || RequireSharedSpaces) {
4221 jio_fprintf(defaultStream::error_stream(),
4222 "Shared spaces are not supported in this VM\n");
4223 return JNI_ERR;
4224 }
4225 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4226 log_is_enabled(Info, cds)) {
4227 warning("Shared spaces are not supported in this VM");
4228 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4229 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4230 }
4231 no_shared_spaces("CDS Disabled");
4232 #endif // INCLUDE_CDS
4233
4234 return JNI_OK;
4235 }
4236
4237 jint Arguments::apply_ergo() {
4238 // Set flags based on ergonomics.
4239 jint result = set_ergonomics_flags();
4240 if (result != JNI_OK) return result;
4241
4242 #if INCLUDE_JVMCI
4243 set_jvmci_specific_flags();
4244 #endif
4245
4246 set_shared_spaces_flags();
4247
4248 // Check the GC selections again.
4249 if (!check_gc_consistency()) {
4250 return JNI_EINVAL;
4251 }
4252
4253 if (TieredCompilation) {
4254 set_tiered_flags();
4255 } else {
4256 int max_compilation_policy_choice = 1;
4257 #ifdef COMPILER2
4258 if (is_server_compilation_mode_vm()) {
4259 max_compilation_policy_choice = 2;
4260 }
4261 #endif
4262 // Check if the policy is valid.
4263 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4264 vm_exit_during_initialization(
4265 "Incompatible compilation policy selected", NULL);
4266 }
4267 // Scale CompileThreshold
4268 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4269 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4270 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4271 }
4272 }
4273
4274 #ifdef COMPILER2
4275 #ifndef PRODUCT
4276 if (PrintIdealGraphLevel > 0) {
4277 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4278 }
4279 #endif
4280 #endif
4281
4282 // Set heap size based on available physical memory
4283 set_heap_size();
4284
4285 GCArguments::arguments()->initialize_flags();
4286
4287 // Initialize Metaspace flags and alignments
4288 Metaspace::ergo_initialize();
4289
4290 // Set bytecode rewriting flags
4291 set_bytecode_flags();
4292
4293 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4294 jint code = set_aggressive_opts_flags();
4295 if (code != JNI_OK) {
4296 return code;
4297 }
4298
4299 // Turn off biased locking for locking debug mode flags,
4300 // which are subtly different from each other but neither works with
4301 // biased locking
4302 if (UseHeavyMonitors
4303 #ifdef COMPILER1
4304 || !UseFastLocking
4305 #endif // COMPILER1
4306 #if INCLUDE_JVMCI
4307 || !JVMCIUseFastLocking
4308 #endif
4309 ) {
4310 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4311 // flag set to true on command line; warn the user that they
4312 // can't enable biased locking here
4313 warning("Biased Locking is not supported with locking debug flags"
4314 "; ignoring UseBiasedLocking flag." );
4315 }
4316 UseBiasedLocking = false;
4317 }
4318
4319 #ifdef CC_INTERP
4320 // Clear flags not supported on zero.
4321 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4322 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4323 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4324 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4325 #endif // CC_INTERP
4326
4327 #ifdef COMPILER2
4328 if (!EliminateLocks) {
4329 EliminateNestedLocks = false;
4330 }
4331 if (!Inline) {
4332 IncrementalInline = false;
4333 }
4334 #ifndef PRODUCT
4335 if (!IncrementalInline) {
4336 AlwaysIncrementalInline = false;
4337 }
4338 #endif
4339 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4340 // nothing to use the profiling, turn if off
4341 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4342 }
4343 #endif
4344
4345 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4346 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4347 DebugNonSafepoints = true;
4348 }
4349
4350 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4351 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4352 }
4353
4354 if (UseOnStackReplacement && !UseLoopCounter) {
4355 warning("On-stack-replacement requires loop counters; enabling loop counters");
4356 FLAG_SET_DEFAULT(UseLoopCounter, true);
4357 }
4358
4359 #ifndef PRODUCT
4360 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4361 if (use_vm_log()) {
4362 LogVMOutput = true;
4363 }
4364 }
4365 #endif // PRODUCT
4366
4367 if (PrintCommandLineFlags) {
4368 CommandLineFlags::printSetFlags(tty);
4369 }
4370
4371 // Apply CPU specific policy for the BiasedLocking
4372 if (UseBiasedLocking) {
4373 if (!VM_Version::use_biased_locking() &&
4374 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4375 UseBiasedLocking = false;
4376 }
4377 }
4378 #ifdef COMPILER2
4379 if (!UseBiasedLocking || EmitSync != 0) {
4380 UseOptoBiasInlining = false;
4381 }
4382 #endif
4383
4384 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4385 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4386 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4387 } else {
4388 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4389 }
4390
4391 return JNI_OK;
4392 }
4393
4394 jint Arguments::adjust_after_os() {
4395 if (UseNUMA) {
4396 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4397 FLAG_SET_ERGO(bool, UseNUMA, false);
4398 } else if (UseParallelGC || UseParallelOldGC) {
4399 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4400 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4401 }
4402 }
4403 // UseNUMAInterleaving is set to ON for all collectors and
4404 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4405 // such as the parallel collector for Linux and Solaris will
4406 // interleave old gen and survivor spaces on top of NUMA
4407 // allocation policy for the eden space.
4408 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4409 // all platforms and ParallelGC on Windows will interleave all
4410 // of the heap spaces across NUMA nodes.
4411 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4412 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4413 }
4414 }
4415 return JNI_OK;
4416 }
4417
4418 int Arguments::PropertyList_count(SystemProperty* pl) {
4419 int count = 0;
4420 while(pl != NULL) {
4421 count++;
4422 pl = pl->next();
4423 }
4424 return count;
4425 }
4426
4427 // Return the number of readable properties.
4428 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4429 int count = 0;
4430 while(pl != NULL) {
4431 if (pl->is_readable()) {
4432 count++;
4433 }
4434 pl = pl->next();
4435 }
4436 return count;
4437 }
4438
4439 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4440 assert(key != NULL, "just checking");
4441 SystemProperty* prop;
4442 for (prop = pl; prop != NULL; prop = prop->next()) {
4443 if (strcmp(key, prop->key()) == 0) return prop->value();
4444 }
4445 return NULL;
4446 }
4447
4448 // Return the value of the requested property provided that it is a readable property.
4449 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4450 assert(key != NULL, "just checking");
4451 SystemProperty* prop;
4452 // Return the property value if the keys match and the property is not internal or
4453 // it's the special internal property "jdk.boot.class.path.append".
4454 for (prop = pl; prop != NULL; prop = prop->next()) {
4455 if (strcmp(key, prop->key()) == 0) {
4456 if (!prop->internal()) {
4457 return prop->value();
4458 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4459 return prop->value();
4460 } else {
4461 // Property is internal and not jdk.boot.class.path.append so return NULL.
4462 return NULL;
4463 }
4464 }
4465 }
4466 return NULL;
4467 }
4468
4469 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4470 int count = 0;
4471 const char* ret_val = NULL;
4472
4473 while(pl != NULL) {
4474 if(count >= index) {
4475 ret_val = pl->key();
4476 break;
4477 }
4478 count++;
4479 pl = pl->next();
4480 }
4481
4482 return ret_val;
4483 }
4484
4485 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4486 int count = 0;
4487 char* ret_val = NULL;
4488
4489 while(pl != NULL) {
4490 if(count >= index) {
4491 ret_val = pl->value();
4492 break;
4493 }
4494 count++;
4495 pl = pl->next();
4496 }
4497
4498 return ret_val;
4499 }
4500
4501 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4502 SystemProperty* p = *plist;
4503 if (p == NULL) {
4504 *plist = new_p;
4505 } else {
4506 while (p->next() != NULL) {
4507 p = p->next();
4508 }
4509 p->set_next(new_p);
4510 }
4511 }
4512
4513 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4514 bool writeable, bool internal) {
4515 if (plist == NULL)
4516 return;
4517
4518 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4519 PropertyList_add(plist, new_p);
4520 }
4521
4522 void Arguments::PropertyList_add(SystemProperty *element) {
4523 PropertyList_add(&_system_properties, element);
4524 }
4525
4526 // This add maintains unique property key in the list.
4527 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4528 PropertyAppendable append, PropertyWriteable writeable,
4529 PropertyInternal internal) {
4530 if (plist == NULL)
4531 return;
4532
4533 // If property key exist then update with new value.
4534 SystemProperty* prop;
4535 for (prop = *plist; prop != NULL; prop = prop->next()) {
4536 if (strcmp(k, prop->key()) == 0) {
4537 if (append == AppendProperty) {
4538 prop->append_value(v);
4539 } else {
4540 prop->set_value(v);
4541 }
4542 return;
4543 }
4544 }
4545
4546 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4547 }
4548
4549 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4550 // Returns true if all of the source pointed by src has been copied over to
4551 // the destination buffer pointed by buf. Otherwise, returns false.
4552 // Notes:
4553 // 1. If the length (buflen) of the destination buffer excluding the
4554 // NULL terminator character is not long enough for holding the expanded
4555 // pid characters, it also returns false instead of returning the partially
4556 // expanded one.
4557 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4558 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4559 char* buf, size_t buflen) {
4560 const char* p = src;
4561 char* b = buf;
4562 const char* src_end = &src[srclen];
4563 char* buf_end = &buf[buflen - 1];
4564
4565 while (p < src_end && b < buf_end) {
4566 if (*p == '%') {
4567 switch (*(++p)) {
4568 case '%': // "%%" ==> "%"
4569 *b++ = *p++;
4570 break;
4571 case 'p': { // "%p" ==> current process id
4572 // buf_end points to the character before the last character so
4573 // that we could write '\0' to the end of the buffer.
4574 size_t buf_sz = buf_end - b + 1;
4575 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4576
4577 // if jio_snprintf fails or the buffer is not long enough to hold
4578 // the expanded pid, returns false.
4579 if (ret < 0 || ret >= (int)buf_sz) {
4580 return false;
4581 } else {
4582 b += ret;
4583 assert(*b == '\0', "fail in copy_expand_pid");
4584 if (p == src_end && b == buf_end + 1) {
4585 // reach the end of the buffer.
4586 return true;
4587 }
4588 }
4589 p++;
4590 break;
4591 }
4592 default :
4593 *b++ = '%';
4594 }
4595 } else {
4596 *b++ = *p++;
4597 }
4598 }
4599 *b = '\0';
4600 return (p == src_end); // return false if not all of the source was copied
4601 }