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
521 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
522 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
523 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
525 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
526
527 // -------------- Obsolete Flags - sorted by expired_in --------------
528 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
529 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
530 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
531 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
532 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
533 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
534 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
535 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
536 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
537 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
538 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
539 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
540 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
541 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
542 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
543 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
544 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
545 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
546
547 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
548 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
549 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
550 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
551 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
552 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
554 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
555 #endif
556
557 { NULL, JDK_Version(0), JDK_Version(0) }
558 };
559
560 // Flags that are aliases for other flags.
561 typedef struct {
562 const char* alias_name;
563 const char* real_name;
564 } AliasedFlag;
565
566 static AliasedFlag const aliased_jvm_flags[] = {
567 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
568 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
569 { NULL, NULL}
570 };
571
572 // NOTE: A compatibility request will be necessary for each alias to be removed.
573 static AliasedLoggingFlag const aliased_logging_flags[] = {
574 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
575 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
576 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
577 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
578 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
579 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
580 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
581 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
582 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
583 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
584 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
585 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
586 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
587 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
588 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
589 };
590
591 #ifndef PRODUCT
592 // These options are removed in jdk9. Remove this code for jdk10.
593 static AliasedFlag const removed_develop_logging_flags[] = {
594 { "TraceClassInitialization", "-Xlog:class+init" },
595 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
596 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
597 { "TraceItables", "-Xlog:itables=debug" },
598 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
599 { "TraceSafepoint", "-Xlog:safepoint=debug" },
600 { "TraceStartupTime", "-Xlog:startuptime" },
601 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
602 { "PrintVtables", "-Xlog:vtables=debug" },
603 { "VerboseVerification", "-Xlog:verification" },
604 { NULL, NULL }
605 };
606 #endif //PRODUCT
607
608 // Return true if "v" is less than "other", where "other" may be "undefined".
609 static bool version_less_than(JDK_Version v, JDK_Version other) {
610 assert(!v.is_undefined(), "must be defined");
611 if (!other.is_undefined() && v.compare(other) >= 0) {
612 return false;
613 } else {
614 return true;
615 }
616 }
617
618 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
619
620 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
621 // Allow extensions to have priority
622 if (lookup_special_flag_ext(flag_name, flag)) {
623 return true;
624 }
625
626 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
627 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
628 flag = special_jvm_flags[i];
629 return true;
630 }
631 }
632 return false;
633 }
634
635 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
636 assert(version != NULL, "Must provide a version buffer");
637 SpecialFlag flag;
638 if (lookup_special_flag(flag_name, flag)) {
639 if (!flag.obsolete_in.is_undefined()) {
640 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
641 *version = flag.obsolete_in;
642 return true;
643 }
644 }
645 }
646 return false;
647 }
648
649 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
650 assert(version != NULL, "Must provide a version buffer");
651 SpecialFlag flag;
652 if (lookup_special_flag(flag_name, flag)) {
653 if (!flag.deprecated_in.is_undefined()) {
654 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
655 version_less_than(JDK_Version::current(), flag.expired_in)) {
656 *version = flag.deprecated_in;
657 return 1;
658 } else {
659 return -1;
660 }
661 }
662 }
663 return 0;
664 }
665
666 #ifndef PRODUCT
667 const char* Arguments::removed_develop_logging_flag_name(const char* name){
668 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
669 const AliasedFlag& flag = removed_develop_logging_flags[i];
670 if (strcmp(flag.alias_name, name) == 0) {
671 return flag.real_name;
672 }
673 }
674 return NULL;
675 }
676 #endif // PRODUCT
677
678 const char* Arguments::real_flag_name(const char *flag_name) {
679 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
680 const AliasedFlag& flag_status = aliased_jvm_flags[i];
681 if (strcmp(flag_status.alias_name, flag_name) == 0) {
682 return flag_status.real_name;
683 }
684 }
685 return flag_name;
686 }
687
688 #ifdef ASSERT
689 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
690 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
691 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
692 return true;
693 }
694 }
695 return false;
696 }
697
698 // Verifies the correctness of the entries in the special_jvm_flags table.
699 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
700 // version being earlier than the deprecation version, then a warning is issued
701 // and verification fails - by returning false. If it is detected that the table
702 // is out of date, with respect to the current version, then a warning is issued
703 // but verification does not fail. This allows the VM to operate when the version
704 // is first updated, without needing to update all the impacted flags at the
705 // same time.
706 static bool verify_special_jvm_flags() {
707 bool success = true;
708 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
709 const SpecialFlag& flag = special_jvm_flags[i];
710 if (lookup_special_flag(flag.name, i)) {
711 warning("Duplicate special flag declaration \"%s\"", flag.name);
712 success = false;
713 }
714 if (flag.deprecated_in.is_undefined() &&
715 flag.obsolete_in.is_undefined()) {
716 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
717 success = false;
718 }
719
720 if (!flag.deprecated_in.is_undefined()) {
721 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
722 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
723 success = false;
724 }
725
726 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
727 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
728 success = false;
729 }
730 }
731
732 if (!flag.obsolete_in.is_undefined()) {
733 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
734 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
735 success = false;
736 }
737
738 // if flag has become obsolete it should not have a "globals" flag defined anymore.
739 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
740 if (Flag::find_flag(flag.name) != NULL) {
741 // Temporarily disable the warning: 8196739
742 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
743 }
744 }
745 }
746
747 if (!flag.expired_in.is_undefined()) {
748 // if flag has become expired it should not have a "globals" flag defined anymore.
749 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
750 if (Flag::find_flag(flag.name) != NULL) {
751 // Temporarily disable the warning: 8196739
752 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
753 }
754 }
755 }
756
757 }
758 return success;
759 }
760 #endif
761
762 // Parses a size specification string.
763 bool Arguments::atojulong(const char *s, julong* result) {
764 julong n = 0;
765
766 // First char must be a digit. Don't allow negative numbers or leading spaces.
767 if (!isdigit(*s)) {
768 return false;
769 }
770
771 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
772 char* remainder;
773 errno = 0;
774 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
775 if (errno != 0) {
776 return false;
777 }
778
779 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
780 if (remainder == s || strlen(remainder) > 1) {
781 return false;
782 }
783
784 switch (*remainder) {
785 case 'T': case 't':
786 *result = n * G * K;
787 // Check for overflow.
788 if (*result/((julong)G * K) != n) return false;
789 return true;
790 case 'G': case 'g':
791 *result = n * G;
792 if (*result/G != n) return false;
793 return true;
794 case 'M': case 'm':
795 *result = n * M;
796 if (*result/M != n) return false;
797 return true;
798 case 'K': case 'k':
799 *result = n * K;
800 if (*result/K != n) return false;
801 return true;
802 case '\0':
803 *result = n;
804 return true;
805 default:
806 return false;
807 }
808 }
809
810 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
811 if (size < min_size) return arg_too_small;
812 if (size > max_size) return arg_too_big;
813 return arg_in_range;
814 }
815
816 // Describe an argument out of range error
817 void Arguments::describe_range_error(ArgsRange errcode) {
818 switch(errcode) {
819 case arg_too_big:
820 jio_fprintf(defaultStream::error_stream(),
821 "The specified size exceeds the maximum "
822 "representable size.\n");
823 break;
824 case arg_too_small:
825 case arg_unreadable:
826 case arg_in_range:
827 // do nothing for now
828 break;
829 default:
830 ShouldNotReachHere();
831 }
832 }
833
834 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
835 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
836 return true;
837 } else {
838 return false;
839 }
840 }
841
842 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
843 char* end;
844 errno = 0;
845 double v = strtod(value, &end);
846 if ((errno != 0) || (*end != 0)) {
847 return false;
848 }
849
850 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
851 return true;
852 }
853 return false;
854 }
855
856 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
857 julong v;
858 int int_v;
859 intx intx_v;
860 bool is_neg = false;
861 Flag* result = Flag::find_flag(name, strlen(name));
862
863 if (result == NULL) {
864 return false;
865 }
866
867 // Check the sign first since atojulong() parses only unsigned values.
868 if (*value == '-') {
869 if (!result->is_intx() && !result->is_int()) {
870 return false;
871 }
872 value++;
873 is_neg = true;
874 }
875 if (!Arguments::atojulong(value, &v)) {
876 return false;
877 }
878 if (result->is_int()) {
879 int_v = (int) v;
880 if (is_neg) {
881 int_v = -int_v;
882 }
883 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
884 } else if (result->is_uint()) {
885 uint uint_v = (uint) v;
886 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
887 } else if (result->is_intx()) {
888 intx_v = (intx) v;
889 if (is_neg) {
890 intx_v = -intx_v;
891 }
892 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
893 } else if (result->is_uintx()) {
894 uintx uintx_v = (uintx) v;
895 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
896 } else if (result->is_uint64_t()) {
897 uint64_t uint64_t_v = (uint64_t) v;
898 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
899 } else if (result->is_size_t()) {
900 size_t size_t_v = (size_t) v;
901 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
902 } else if (result->is_double()) {
903 double double_v = (double) v;
904 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
905 } else {
906 return false;
907 }
908 }
909
910 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
911 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
912 // Contract: CommandLineFlags always returns a pointer that needs freeing.
913 FREE_C_HEAP_ARRAY(char, value);
914 return true;
915 }
916
917 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
918 const char* old_value = "";
919 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
920 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
921 size_t new_len = strlen(new_value);
922 const char* value;
923 char* free_this_too = NULL;
924 if (old_len == 0) {
925 value = new_value;
926 } else if (new_len == 0) {
927 value = old_value;
928 } else {
929 size_t length = old_len + 1 + new_len + 1;
930 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
931 // each new setting adds another LINE to the switch:
932 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
933 value = buf;
934 free_this_too = buf;
935 }
936 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
937 // CommandLineFlags always returns a pointer that needs freeing.
938 FREE_C_HEAP_ARRAY(char, value);
939 if (free_this_too != NULL) {
940 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
941 FREE_C_HEAP_ARRAY(char, free_this_too);
942 }
943 return true;
944 }
945
946 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
947 const char* real_name = real_flag_name(arg);
948 JDK_Version since = JDK_Version();
949 switch (is_deprecated_flag(arg, &since)) {
950 case -1:
951 return NULL; // obsolete or expired, don't process normally
952 case 0:
953 return real_name;
954 case 1: {
955 if (warn) {
956 char version[256];
957 since.to_string(version, sizeof(version));
958 if (real_name != arg) {
959 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
960 arg, version, real_name);
961 } else {
962 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
963 arg, version);
964 }
965 }
966 return real_name;
967 }
968 }
969 ShouldNotReachHere();
970 return NULL;
971 }
972
973 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
974 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
975 // Set tagset string buffer at max size of 256, large enough for any alias tagset
976 const int max_tagset_size = 256;
977 int max_tagset_len = max_tagset_size - 1;
978 char tagset_buffer[max_tagset_size];
979 tagset_buffer[0] = '\0';
980
981 // Write tag-set for aliased logging option, in string list form
982 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
983 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
984 if (i > 0) {
985 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
986 }
987 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
988 }
989 if (!alf.exactMatch) {
990 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
991 }
992 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
993 (on) ? "+" : "-",
994 name,
995 tagset_buffer,
996 (on) ? LogLevel::name(alf.level) : "off");
997 }
998
999 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1000 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1001 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1002 if (strcmp(alf.alias_name, name) == 0) {
1003 log_deprecated_flag(name, on, alf);
1004 return alf;
1005 }
1006 }
1007 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1008 return a;
1009 }
1010
1011 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1012
1013 // range of acceptable characters spelled out for portability reasons
1014 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1015 #define BUFLEN 255
1016 char name[BUFLEN+1];
1017 char dummy;
1018 const char* real_name;
1019 bool warn_if_deprecated = true;
1020
1021 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1022 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1023 if (alf.alias_name != NULL){
1024 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1025 return true;
1026 }
1027 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1028 if (real_name == NULL) {
1029 return false;
1030 }
1031 return set_bool_flag(real_name, false, origin);
1032 }
1033 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1034 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1035 if (alf.alias_name != NULL){
1036 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1037 return true;
1038 }
1039 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1040 if (real_name == NULL) {
1041 return false;
1042 }
1043 return set_bool_flag(real_name, true, origin);
1044 }
1045
1046 char punct;
1047 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1048 const char* value = strchr(arg, '=') + 1;
1049 Flag* flag;
1050
1051 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1052 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1053 if (alf.alias_name != NULL) {
1054 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1055 return true;
1056 }
1057 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1058 if (real_name == NULL) {
1059 return false;
1060 }
1061 flag = Flag::find_flag(real_name);
1062 if (flag != NULL && flag->is_ccstr()) {
1063 if (flag->ccstr_accumulates()) {
1064 return append_to_string_flag(real_name, value, origin);
1065 } else {
1066 if (value[0] == '\0') {
1067 value = NULL;
1068 }
1069 return set_string_flag(real_name, value, origin);
1070 }
1071 } else {
1072 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1073 }
1074 }
1075
1076 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1077 const char* value = strchr(arg, '=') + 1;
1078 // -XX:Foo:=xxx will reset the string flag to the given value.
1079 if (value[0] == '\0') {
1080 value = NULL;
1081 }
1082 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1083 if (real_name == NULL) {
1084 return false;
1085 }
1086 return set_string_flag(real_name, value, origin);
1087 }
1088
1089 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1090 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1091 #define NUMBER_RANGE "[0123456789eE+-]"
1092 char value[BUFLEN + 1];
1093 char value2[BUFLEN + 1];
1094 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1095 // Looks like a floating-point number -- try again with more lenient format string
1096 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1097 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1098 if (real_name == NULL) {
1099 return false;
1100 }
1101 return set_fp_numeric_flag(real_name, value, origin);
1102 }
1103 }
1104
1105 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1106 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1107 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1108 if (real_name == NULL) {
1109 return false;
1110 }
1111 return set_numeric_flag(real_name, value, origin);
1112 }
1113
1114 return false;
1115 }
1116
1117 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1118 assert(bldarray != NULL, "illegal argument");
1119
1120 if (arg == NULL) {
1121 return;
1122 }
1123
1124 int new_count = *count + 1;
1125
1126 // expand the array and add arg to the last element
1127 if (*bldarray == NULL) {
1128 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1129 } else {
1130 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1131 }
1132 (*bldarray)[*count] = os::strdup_check_oom(arg);
1133 *count = new_count;
1134 }
1135
1136 void Arguments::build_jvm_args(const char* arg) {
1137 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1138 }
1139
1140 void Arguments::build_jvm_flags(const char* arg) {
1141 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1142 }
1143
1144 // utility function to return a string that concatenates all
1145 // strings in a given char** array
1146 const char* Arguments::build_resource_string(char** args, int count) {
1147 if (args == NULL || count == 0) {
1148 return NULL;
1149 }
1150 size_t length = 0;
1151 for (int i = 0; i < count; i++) {
1152 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1153 }
1154 char* s = NEW_RESOURCE_ARRAY(char, length);
1155 char* dst = s;
1156 for (int j = 0; j < count; j++) {
1157 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1158 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1159 dst += offset;
1160 length -= offset;
1161 }
1162 return (const char*) s;
1163 }
1164
1165 void Arguments::print_on(outputStream* st) {
1166 st->print_cr("VM Arguments:");
1167 if (num_jvm_flags() > 0) {
1168 st->print("jvm_flags: "); print_jvm_flags_on(st);
1169 st->cr();
1170 }
1171 if (num_jvm_args() > 0) {
1172 st->print("jvm_args: "); print_jvm_args_on(st);
1173 st->cr();
1174 }
1175 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1176 if (_java_class_path != NULL) {
1177 char* path = _java_class_path->value();
1178 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1179 }
1180 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1181 }
1182
1183 void Arguments::print_summary_on(outputStream* st) {
1184 // Print the command line. Environment variables that are helpful for
1185 // reproducing the problem are written later in the hs_err file.
1186 // flags are from setting file
1187 if (num_jvm_flags() > 0) {
1188 st->print_raw("Settings File: ");
1189 print_jvm_flags_on(st);
1190 st->cr();
1191 }
1192 // args are the command line and environment variable arguments.
1193 st->print_raw("Command Line: ");
1194 if (num_jvm_args() > 0) {
1195 print_jvm_args_on(st);
1196 }
1197 // this is the classfile and any arguments to the java program
1198 if (java_command() != NULL) {
1199 st->print("%s", java_command());
1200 }
1201 st->cr();
1202 }
1203
1204 void Arguments::print_jvm_flags_on(outputStream* st) {
1205 if (_num_jvm_flags > 0) {
1206 for (int i=0; i < _num_jvm_flags; i++) {
1207 st->print("%s ", _jvm_flags_array[i]);
1208 }
1209 }
1210 }
1211
1212 void Arguments::print_jvm_args_on(outputStream* st) {
1213 if (_num_jvm_args > 0) {
1214 for (int i=0; i < _num_jvm_args; i++) {
1215 st->print("%s ", _jvm_args_array[i]);
1216 }
1217 }
1218 }
1219
1220 bool Arguments::process_argument(const char* arg,
1221 jboolean ignore_unrecognized,
1222 Flag::Flags origin) {
1223 JDK_Version since = JDK_Version();
1224
1225 if (parse_argument(arg, origin)) {
1226 return true;
1227 }
1228
1229 // Determine if the flag has '+', '-', or '=' characters.
1230 bool has_plus_minus = (*arg == '+' || *arg == '-');
1231 const char* const argname = has_plus_minus ? arg + 1 : arg;
1232
1233 size_t arg_len;
1234 const char* equal_sign = strchr(argname, '=');
1235 if (equal_sign == NULL) {
1236 arg_len = strlen(argname);
1237 } else {
1238 arg_len = equal_sign - argname;
1239 }
1240
1241 // Only make the obsolete check for valid arguments.
1242 if (arg_len <= BUFLEN) {
1243 // Construct a string which consists only of the argument name without '+', '-', or '='.
1244 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1245 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1246 if (is_obsolete_flag(stripped_argname, &since)) {
1247 char version[256];
1248 since.to_string(version, sizeof(version));
1249 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1250 return true;
1251 }
1252 #ifndef PRODUCT
1253 else {
1254 const char* replacement;
1255 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1256 log_warning(arguments)("%s has been removed. Please use %s instead.",
1257 stripped_argname,
1258 replacement);
1259 return false;
1260 }
1261 }
1262 #endif //PRODUCT
1263 }
1264
1265 // For locked flags, report a custom error message if available.
1266 // Otherwise, report the standard unrecognized VM option.
1267 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1268 if (found_flag != NULL) {
1269 char locked_message_buf[BUFLEN];
1270 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1271 if (strlen(locked_message_buf) == 0) {
1272 if (found_flag->is_bool() && !has_plus_minus) {
1273 jio_fprintf(defaultStream::error_stream(),
1274 "Missing +/- setting for VM option '%s'\n", argname);
1275 } else if (!found_flag->is_bool() && has_plus_minus) {
1276 jio_fprintf(defaultStream::error_stream(),
1277 "Unexpected +/- setting in VM option '%s'\n", argname);
1278 } else {
1279 jio_fprintf(defaultStream::error_stream(),
1280 "Improperly specified VM option '%s'\n", argname);
1281 }
1282 } else {
1283 #ifdef PRODUCT
1284 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1285 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1286 if (ignore_unrecognized && mismatched) {
1287 return true;
1288 }
1289 #endif
1290 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1291 }
1292 } else {
1293 if (ignore_unrecognized) {
1294 return true;
1295 }
1296 jio_fprintf(defaultStream::error_stream(),
1297 "Unrecognized VM option '%s'\n", argname);
1298 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1299 if (fuzzy_matched != NULL) {
1300 jio_fprintf(defaultStream::error_stream(),
1301 "Did you mean '%s%s%s'? ",
1302 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1303 fuzzy_matched->_name,
1304 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1305 }
1306 }
1307
1308 // allow for commandline "commenting out" options like -XX:#+Verbose
1309 return arg[0] == '#';
1310 }
1311
1312 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1313 FILE* stream = fopen(file_name, "rb");
1314 if (stream == NULL) {
1315 if (should_exist) {
1316 jio_fprintf(defaultStream::error_stream(),
1317 "Could not open settings file %s\n", file_name);
1318 return false;
1319 } else {
1320 return true;
1321 }
1322 }
1323
1324 char token[1024];
1325 int pos = 0;
1326
1327 bool in_white_space = true;
1328 bool in_comment = false;
1329 bool in_quote = false;
1330 char quote_c = 0;
1331 bool result = true;
1332
1333 int c = getc(stream);
1334 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1335 if (in_white_space) {
1336 if (in_comment) {
1337 if (c == '\n') in_comment = false;
1338 } else {
1339 if (c == '#') in_comment = true;
1340 else if (!isspace(c)) {
1341 in_white_space = false;
1342 token[pos++] = c;
1343 }
1344 }
1345 } else {
1346 if (c == '\n' || (!in_quote && isspace(c))) {
1347 // token ends at newline, or at unquoted whitespace
1348 // this allows a way to include spaces in string-valued options
1349 token[pos] = '\0';
1350 logOption(token);
1351 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1352 build_jvm_flags(token);
1353 pos = 0;
1354 in_white_space = true;
1355 in_quote = false;
1356 } else if (!in_quote && (c == '\'' || c == '"')) {
1357 in_quote = true;
1358 quote_c = c;
1359 } else if (in_quote && (c == quote_c)) {
1360 in_quote = false;
1361 } else {
1362 token[pos++] = c;
1363 }
1364 }
1365 c = getc(stream);
1366 }
1367 if (pos > 0) {
1368 token[pos] = '\0';
1369 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1370 build_jvm_flags(token);
1371 }
1372 fclose(stream);
1373 return result;
1374 }
1375
1376 //=============================================================================================================
1377 // Parsing of properties (-D)
1378
1379 const char* Arguments::get_property(const char* key) {
1380 return PropertyList_get_value(system_properties(), key);
1381 }
1382
1383 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1384 const char* eq = strchr(prop, '=');
1385 const char* key;
1386 const char* value = "";
1387
1388 if (eq == NULL) {
1389 // property doesn't have a value, thus use passed string
1390 key = prop;
1391 } else {
1392 // property have a value, thus extract it and save to the
1393 // allocated string
1394 size_t key_len = eq - prop;
1395 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1396
1397 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1398 key = tmp_key;
1399
1400 value = &prop[key_len + 1];
1401 }
1402
1403 if (strcmp(key, "java.compiler") == 0) {
1404 process_java_compiler_argument(value);
1405 // Record value in Arguments, but let it get passed to Java.
1406 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1407 strcmp(key, "sun.java.launcher.pid") == 0) {
1408 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1409 // private and are processed in process_sun_java_launcher_properties();
1410 // the sun.java.launcher property is passed on to the java application
1411 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1412 // append is true, writable is true, internal is false
1413 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1414 WriteableProperty, ExternalProperty);
1415 } else {
1416 if (strcmp(key, "sun.java.command") == 0) {
1417 char *old_java_command = _java_command;
1418 _java_command = os::strdup_check_oom(value, mtArguments);
1419 if (old_java_command != NULL) {
1420 os::free(old_java_command);
1421 }
1422 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1423 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1424 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1425 // its value without going through the property list or making a Java call.
1426 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1427 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1428 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1429 os::free((void *)old_java_vendor_url_bug);
1430 }
1431 }
1432
1433 // Create new property and add at the end of the list
1434 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1435 }
1436
1437 if (key != prop) {
1438 // SystemProperty copy passed value, thus free previously allocated
1439 // memory
1440 FreeHeap((void *)key);
1441 }
1442
1443 return true;
1444 }
1445
1446 #if INCLUDE_CDS
1447 void Arguments::check_unsupported_dumping_properties() {
1448 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1449 const char* unsupported_properties[] = { "jdk.module.main",
1450 "jdk.module.limitmods",
1451 "jdk.module.path",
1452 "jdk.module.upgrade.path",
1453 "jdk.module.patch.0" };
1454 const char* unsupported_options[] = { "-m", // cannot use at dump time
1455 "--limit-modules", // ignored at dump time
1456 "--module-path", // ignored at dump time
1457 "--upgrade-module-path", // ignored at dump time
1458 "--patch-module" // ignored at dump time
1459 };
1460 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1461 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1462 // vm will exit with an error message. Otherwise, it will print an informational message if
1463 // -Xlog:cds is enabled.
1464 uint info_idx = 1;
1465 SystemProperty* sp = system_properties();
1466 while (sp != NULL) {
1467 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1468 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1469 if (i < info_idx) {
1470 vm_exit_during_initialization(
1471 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1472 } else {
1473 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1474 unsupported_options[i]);
1475 }
1476 }
1477 }
1478 sp = sp->next();
1479 }
1480
1481 // Check for an exploded module build in use with -Xshare:dump.
1482 if (!has_jimage()) {
1483 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1484 }
1485 }
1486 #endif
1487
1488 //===========================================================================================================
1489 // Setting int/mixed/comp mode flags
1490
1491 void Arguments::set_mode_flags(Mode mode) {
1492 // Set up default values for all flags.
1493 // If you add a flag to any of the branches below,
1494 // add a default value for it here.
1495 set_java_compiler(false);
1496 _mode = mode;
1497
1498 // Ensure Agent_OnLoad has the correct initial values.
1499 // This may not be the final mode; mode may change later in onload phase.
1500 PropertyList_unique_add(&_system_properties, "java.vm.info",
1501 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1502
1503 UseInterpreter = true;
1504 UseCompiler = true;
1505 UseLoopCounter = true;
1506
1507 // Default values may be platform/compiler dependent -
1508 // use the saved values
1509 ClipInlining = Arguments::_ClipInlining;
1510 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1511 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1512 BackgroundCompilation = Arguments::_BackgroundCompilation;
1513 if (TieredCompilation) {
1514 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1515 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1516 }
1517 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1518 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1519 }
1520 }
1521
1522 // Change from defaults based on mode
1523 switch (mode) {
1524 default:
1525 ShouldNotReachHere();
1526 break;
1527 case _int:
1528 UseCompiler = false;
1529 UseLoopCounter = false;
1530 AlwaysCompileLoopMethods = false;
1531 UseOnStackReplacement = false;
1532 break;
1533 case _mixed:
1534 // same as default
1535 break;
1536 case _comp:
1537 UseInterpreter = false;
1538 BackgroundCompilation = false;
1539 ClipInlining = false;
1540 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1541 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1542 // compile a level 4 (C2) and then continue executing it.
1543 if (TieredCompilation) {
1544 Tier3InvokeNotifyFreqLog = 0;
1545 Tier4InvocationThreshold = 0;
1546 }
1547 break;
1548 }
1549 }
1550
1551 // Conflict: required to use shared spaces (-Xshare:on), but
1552 // incompatible command line options were chosen.
1553 static void no_shared_spaces(const char* message) {
1554 if (RequireSharedSpaces) {
1555 jio_fprintf(defaultStream::error_stream(),
1556 "Class data sharing is inconsistent with other specified options.\n");
1557 vm_exit_during_initialization("Unable to use shared archive.", message);
1558 } else {
1559 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1560 }
1561 }
1562
1563 // Returns threshold scaled with the value of scale.
1564 // If scale < 0.0, threshold is returned without scaling.
1565 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1566 if (scale == 1.0 || scale < 0.0) {
1567 return threshold;
1568 } else {
1569 return (intx)(threshold * scale);
1570 }
1571 }
1572
1573 // Returns freq_log scaled with the value of scale.
1574 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1575 // If scale < 0.0, freq_log is returned without scaling.
1576 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1577 // Check if scaling is necessary or if negative value was specified.
1578 if (scale == 1.0 || scale < 0.0) {
1579 return freq_log;
1580 }
1581 // Check values to avoid calculating log2 of 0.
1582 if (scale == 0.0 || freq_log == 0) {
1583 return 0;
1584 }
1585 // Determine the maximum notification frequency value currently supported.
1586 // The largest mask value that the interpreter/C1 can handle is
1587 // of length InvocationCounter::number_of_count_bits. Mask values are always
1588 // one bit shorter then the value of the notification frequency. Set
1589 // max_freq_bits accordingly.
1590 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1591 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1592 if (scaled_freq == 0) {
1593 // Return 0 right away to avoid calculating log2 of 0.
1594 return 0;
1595 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1596 return max_freq_bits;
1597 } else {
1598 return log2_intptr(scaled_freq);
1599 }
1600 }
1601
1602 void Arguments::set_tiered_flags() {
1603 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1604 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1605 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1606 }
1607 if (CompilationPolicyChoice < 2) {
1608 vm_exit_during_initialization(
1609 "Incompatible compilation policy selected", NULL);
1610 }
1611 // Increase the code cache size - tiered compiles a lot more.
1612 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1613 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1614 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1615 }
1616 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1617 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1618 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1619 }
1620 if (!UseInterpreter) { // -Xcomp
1621 Tier3InvokeNotifyFreqLog = 0;
1622 Tier4InvocationThreshold = 0;
1623 }
1624
1625 if (CompileThresholdScaling < 0) {
1626 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1627 }
1628
1629 // Scale tiered compilation thresholds.
1630 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1631 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1632 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1633 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1634
1635 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1636 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1637 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1638 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1639
1640 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1641 // once these thresholds become supported.
1642
1643 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1644 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1645
1646 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1647 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1648
1649 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1650
1651 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1652 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1653 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1654 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1655 }
1656 }
1657
1658 void set_object_alignment() {
1659 // Object alignment.
1660 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1661 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1662 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1663 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1664 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1665 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1666
1667 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1668 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1669
1670 // Oop encoding heap max
1671 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1672
1673 if (SurvivorAlignmentInBytes == 0) {
1674 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1675 }
1676 }
1677
1678 size_t Arguments::max_heap_for_compressed_oops() {
1679 // Avoid sign flip.
1680 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1681 // We need to fit both the NULL page and the heap into the memory budget, while
1682 // keeping alignment constraints of the heap. To guarantee the latter, as the
1683 // NULL page is located before the heap, we pad the NULL page to the conservative
1684 // maximum alignment that the GC may ever impose upon the heap.
1685 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1686 _conservative_max_heap_alignment);
1687
1688 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1689 NOT_LP64(ShouldNotReachHere(); return 0);
1690 }
1691
1692 void Arguments::set_use_compressed_oops() {
1693 #ifndef ZERO
1694 #ifdef _LP64
1695 // MaxHeapSize is not set up properly at this point, but
1696 // the only value that can override MaxHeapSize if we are
1697 // to use UseCompressedOops is InitialHeapSize.
1698 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1699
1700 if (max_heap_size <= max_heap_for_compressed_oops()) {
1701 #if !defined(COMPILER1) || defined(TIERED)
1702 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1703 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1704 }
1705 #endif
1706 } else {
1707 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1708 warning("Max heap size too large for Compressed Oops");
1709 FLAG_SET_DEFAULT(UseCompressedOops, false);
1710 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1711 }
1712 }
1713 #endif // _LP64
1714 #endif // ZERO
1715 }
1716
1717
1718 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1719 // set_use_compressed_oops().
1720 void Arguments::set_use_compressed_klass_ptrs() {
1721 #ifndef ZERO
1722 #ifdef _LP64
1723 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1724 if (!UseCompressedOops) {
1725 if (UseCompressedClassPointers) {
1726 warning("UseCompressedClassPointers requires UseCompressedOops");
1727 }
1728 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1729 } else {
1730 // Turn on UseCompressedClassPointers too
1731 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1732 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1733 }
1734 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1735 if (UseCompressedClassPointers) {
1736 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1737 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1738 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1739 }
1740 }
1741 }
1742 #endif // _LP64
1743 #endif // !ZERO
1744 }
1745
1746 void Arguments::set_conservative_max_heap_alignment() {
1747 // The conservative maximum required alignment for the heap is the maximum of
1748 // the alignments imposed by several sources: any requirements from the heap
1749 // itself, the collector policy and the maximum page size we may run the VM
1750 // with.
1751 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1752 _conservative_max_heap_alignment = MAX4(heap_alignment,
1753 (size_t)os::vm_allocation_granularity(),
1754 os::max_page_size(),
1755 CollectorPolicy::compute_heap_alignment());
1756 }
1757
1758 #ifdef TIERED
1759 bool Arguments::compilation_mode_selected() {
1760 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1761 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1762
1763 }
1764
1765 void Arguments::select_compilation_mode_ergonomically() {
1766 #if defined(_WINDOWS) && !defined(_LP64)
1767 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1768 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1769 }
1770 #endif
1771 if (NeverActAsServerClassMachine) {
1772 set_client_compilation_mode();
1773 }
1774 }
1775 #endif //TIERED
1776
1777 #if INCLUDE_JVMCI
1778 void Arguments::set_jvmci_specific_flags() {
1779 if (UseJVMCICompiler) {
1780 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1781 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1782 }
1783 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1784 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1785 }
1786 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1787 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1788 }
1789 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1790 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1791 }
1792 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1793 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1794 }
1795 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1796 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1797 }
1798 if (TieredStopAtLevel != CompLevel_full_optimization) {
1799 // Currently JVMCI compiler can only work at the full optimization level
1800 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1801 TieredStopAtLevel = CompLevel_full_optimization;
1802 }
1803 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1804 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1805 }
1806 }
1807 }
1808 #endif
1809
1810 jint Arguments::set_ergonomics_flags() {
1811 #ifdef TIERED
1812 if (!compilation_mode_selected()) {
1813 select_compilation_mode_ergonomically();
1814 }
1815 #endif
1816
1817 jint gc_result = GCArguments::initialize();
1818 if (gc_result != JNI_OK) {
1819 return gc_result;
1820 }
1821
1822 #if COMPILER2_OR_JVMCI
1823 // Shared spaces work fine with other GCs but causes bytecode rewriting
1824 // to be disabled, which hurts interpreter performance and decreases
1825 // server performance. When -server is specified, keep the default off
1826 // unless it is asked for. Future work: either add bytecode rewriting
1827 // at link time, or rewrite bytecodes in non-shared methods.
1828 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1829 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1830 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1831 }
1832 #endif
1833
1834 #if defined(IA32)
1835 // Only server compiler can optimize safepoints well enough.
1836 if (!is_server_compilation_mode_vm()) {
1837 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1838 }
1839 #endif
1840
1841 set_conservative_max_heap_alignment();
1842
1843 #ifndef ZERO
1844 #ifdef _LP64
1845 set_use_compressed_oops();
1846
1847 // set_use_compressed_klass_ptrs() must be called after calling
1848 // set_use_compressed_oops().
1849 set_use_compressed_klass_ptrs();
1850
1851 // Also checks that certain machines are slower with compressed oops
1852 // in vm_version initialization code.
1853 #endif // _LP64
1854 #endif // !ZERO
1855
1856 return JNI_OK;
1857 }
1858
1859 julong Arguments::limit_by_allocatable_memory(julong limit) {
1860 julong max_allocatable;
1861 julong result = limit;
1862 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1863 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1864 }
1865 return result;
1866 }
1867
1868 // Use static initialization to get the default before parsing
1869 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1870
1871 void Arguments::set_heap_size() {
1872 julong phys_mem =
1873 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1874 : (julong)MaxRAM;
1875
1876 // Convert deprecated flags
1877 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1878 !FLAG_IS_DEFAULT(MaxRAMFraction))
1879 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1880
1881 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1882 !FLAG_IS_DEFAULT(MinRAMFraction))
1883 MinRAMPercentage = 100.0 / MinRAMFraction;
1884
1885 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1886 !FLAG_IS_DEFAULT(InitialRAMFraction))
1887 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1888
1889 // If the maximum heap size has not been set with -Xmx,
1890 // then set it as fraction of the size of physical memory,
1891 // respecting the maximum and minimum sizes of the heap.
1892 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1893 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1894 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1895 if (reasonable_min < MaxHeapSize) {
1896 // Small physical memory, so use a minimum fraction of it for the heap
1897 reasonable_max = reasonable_min;
1898 } else {
1899 // Not-small physical memory, so require a heap at least
1900 // as large as MaxHeapSize
1901 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1902 }
1903
1904 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1905 // Limit the heap size to ErgoHeapSizeLimit
1906 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1907 }
1908 if (UseCompressedOops) {
1909 // Limit the heap size to the maximum possible when using compressed oops
1910 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1911
1912 // HeapBaseMinAddress can be greater than default but not less than.
1913 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1914 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1915 // matches compressed oops printing flags
1916 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1917 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1918 DefaultHeapBaseMinAddress,
1919 DefaultHeapBaseMinAddress/G,
1920 HeapBaseMinAddress);
1921 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1922 }
1923 }
1924
1925 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1926 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1927 // but it should be not less than default MaxHeapSize.
1928 max_coop_heap -= HeapBaseMinAddress;
1929 }
1930 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1931 }
1932 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1933
1934 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1935 // An initial heap size was specified on the command line,
1936 // so be sure that the maximum size is consistent. Done
1937 // after call to limit_by_allocatable_memory because that
1938 // method might reduce the allocation size.
1939 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1940 }
1941
1942 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1943 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1944 }
1945
1946 // If the minimum or initial heap_size have not been set or requested to be set
1947 // ergonomically, set them accordingly.
1948 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1949 julong reasonable_minimum = (julong)(OldSize + NewSize);
1950
1951 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1952
1953 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1954
1955 if (InitialHeapSize == 0) {
1956 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1957
1958 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1959 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1960
1961 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1962
1963 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1964 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1965 }
1966 // If the minimum heap size has not been set (via -Xms),
1967 // synchronize with InitialHeapSize to avoid errors with the default value.
1968 if (min_heap_size() == 0) {
1969 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1970 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1971 }
1972 }
1973 }
1974
1975 // This option inspects the machine and attempts to set various
1976 // parameters to be optimal for long-running, memory allocation
1977 // intensive jobs. It is intended for machines with large
1978 // amounts of cpu and memory.
1979 jint Arguments::set_aggressive_heap_flags() {
1980 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1981 // VM, but we may not be able to represent the total physical memory
1982 // available (like having 8gb of memory on a box but using a 32bit VM).
1983 // Thus, we need to make sure we're using a julong for intermediate
1984 // calculations.
1985 julong initHeapSize;
1986 julong total_memory = os::physical_memory();
1987
1988 if (total_memory < (julong) 256 * M) {
1989 jio_fprintf(defaultStream::error_stream(),
1990 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1991 vm_exit(1);
1992 }
1993
1994 // The heap size is half of available memory, or (at most)
1995 // all of possible memory less 160mb (leaving room for the OS
1996 // when using ISM). This is the maximum; because adaptive sizing
1997 // is turned on below, the actual space used may be smaller.
1998
1999 initHeapSize = MIN2(total_memory / (julong) 2,
2000 total_memory - (julong) 160 * M);
2001
2002 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2003
2004 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2005 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2006 return JNI_EINVAL;
2007 }
2008 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2009 return JNI_EINVAL;
2010 }
2011 // Currently the minimum size and the initial heap sizes are the same.
2012 set_min_heap_size(initHeapSize);
2013 }
2014 if (FLAG_IS_DEFAULT(NewSize)) {
2015 // Make the young generation 3/8ths of the total heap.
2016 if (FLAG_SET_CMDLINE(size_t, NewSize,
2017 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2018 return JNI_EINVAL;
2019 }
2020 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2021 return JNI_EINVAL;
2022 }
2023 }
2024
2025 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2026 FLAG_SET_DEFAULT(UseLargePages, true);
2027 #endif
2028
2029 // Increase some data structure sizes for efficiency
2030 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2031 return JNI_EINVAL;
2032 }
2033 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2034 return JNI_EINVAL;
2035 }
2036 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2037 return JNI_EINVAL;
2038 }
2039
2040 // See the OldPLABSize comment below, but replace 'after promotion'
2041 // with 'after copying'. YoungPLABSize is the size of the survivor
2042 // space per-gc-thread buffers. The default is 4kw.
2043 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2044 return JNI_EINVAL;
2045 }
2046
2047 // OldPLABSize is the size of the buffers in the old gen that
2048 // UseParallelGC uses to promote live data that doesn't fit in the
2049 // survivor spaces. At any given time, there's one for each gc thread.
2050 // The default size is 1kw. These buffers are rarely used, since the
2051 // survivor spaces are usually big enough. For specjbb, however, there
2052 // are occasions when there's lots of live data in the young gen
2053 // and we end up promoting some of it. We don't have a definite
2054 // explanation for why bumping OldPLABSize helps, but the theory
2055 // is that a bigger PLAB results in retaining something like the
2056 // original allocation order after promotion, which improves mutator
2057 // locality. A minor effect may be that larger PLABs reduce the
2058 // number of PLAB allocation events during gc. The value of 8kw
2059 // was arrived at by experimenting with specjbb.
2060 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2061 return JNI_EINVAL;
2062 }
2063
2064 // Enable parallel GC and adaptive generation sizing
2065 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2066 return JNI_EINVAL;
2067 }
2068
2069 // Encourage steady state memory management
2070 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2071 return JNI_EINVAL;
2072 }
2073
2074 // This appears to improve mutator locality
2075 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2076 return JNI_EINVAL;
2077 }
2078
2079 // Get around early Solaris scheduling bug
2080 // (affinity vs other jobs on system)
2081 // but disallow DR and offlining (5008695).
2082 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2083 return JNI_EINVAL;
2084 }
2085
2086 return JNI_OK;
2087 }
2088
2089 // This must be called after ergonomics.
2090 void Arguments::set_bytecode_flags() {
2091 if (!RewriteBytecodes) {
2092 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2093 }
2094 }
2095
2096 // Aggressive optimization flags -XX:+AggressiveOpts
2097 jint Arguments::set_aggressive_opts_flags() {
2098 #ifdef COMPILER2
2099 if (AggressiveUnboxing) {
2100 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2101 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2102 } else if (!EliminateAutoBox) {
2103 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2104 AggressiveUnboxing = false;
2105 }
2106 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2107 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2108 } else if (!DoEscapeAnalysis) {
2109 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2110 AggressiveUnboxing = false;
2111 }
2112 }
2113 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2114 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2115 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2116 }
2117 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2118 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2119 }
2120
2121 // Feed the cache size setting into the JDK
2122 char buffer[1024];
2123 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2124 if (!add_property(buffer)) {
2125 return JNI_ENOMEM;
2126 }
2127 }
2128 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2129 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2130 }
2131 #endif
2132
2133 if (AggressiveOpts) {
2134 // Sample flag setting code
2135 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2136 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2137 // }
2138 }
2139
2140 return JNI_OK;
2141 }
2142
2143 //===========================================================================================================
2144 // Parsing of java.compiler property
2145
2146 void Arguments::process_java_compiler_argument(const char* arg) {
2147 // For backwards compatibility, Djava.compiler=NONE or ""
2148 // causes us to switch to -Xint mode UNLESS -Xdebug
2149 // is also specified.
2150 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2151 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2152 }
2153 }
2154
2155 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2156 _sun_java_launcher = os::strdup_check_oom(launcher);
2157 }
2158
2159 bool Arguments::created_by_java_launcher() {
2160 assert(_sun_java_launcher != NULL, "property must have value");
2161 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2162 }
2163
2164 bool Arguments::sun_java_launcher_is_altjvm() {
2165 return _sun_java_launcher_is_altjvm;
2166 }
2167
2168 //===========================================================================================================
2169 // Parsing of main arguments
2170
2171 #if INCLUDE_JVMCI
2172 // Check consistency of jvmci vm argument settings.
2173 bool Arguments::check_jvmci_args_consistency() {
2174 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2175 }
2176 #endif //INCLUDE_JVMCI
2177
2178 // Check consistency of GC selection
2179 bool Arguments::check_gc_consistency() {
2180 // Ensure that the user has not selected conflicting sets
2181 // of collectors.
2182 uint i = 0;
2183 if (UseSerialGC) i++;
2184 if (UseConcMarkSweepGC) i++;
2185 if (UseParallelGC || UseParallelOldGC) i++;
2186 if (UseG1GC) i++;
2187 if (i > 1) {
2188 jio_fprintf(defaultStream::error_stream(),
2189 "Conflicting collector combinations in option list; "
2190 "please refer to the release notes for the combinations "
2191 "allowed\n");
2192 return false;
2193 }
2194
2195 return true;
2196 }
2197
2198 // Check the consistency of vm_init_args
2199 bool Arguments::check_vm_args_consistency() {
2200 // Method for adding checks for flag consistency.
2201 // The intent is to warn the user of all possible conflicts,
2202 // before returning an error.
2203 // Note: Needs platform-dependent factoring.
2204 bool status = true;
2205
2206 if (TLABRefillWasteFraction == 0) {
2207 jio_fprintf(defaultStream::error_stream(),
2208 "TLABRefillWasteFraction should be a denominator, "
2209 "not " SIZE_FORMAT "\n",
2210 TLABRefillWasteFraction);
2211 status = false;
2212 }
2213
2214 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2215 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2216 }
2217
2218 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2219 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2220 }
2221
2222 if (GCTimeLimit == 100) {
2223 // Turn off gc-overhead-limit-exceeded checks
2224 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2225 }
2226
2227 status = status && check_gc_consistency();
2228
2229 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2230 // insists that we hold the requisite locks so that the iteration is
2231 // MT-safe. For the verification at start-up and shut-down, we don't
2232 // yet have a good way of acquiring and releasing these locks,
2233 // which are not visible at the CollectedHeap level. We want to
2234 // be able to acquire these locks and then do the iteration rather
2235 // than just disable the lock verification. This will be fixed under
2236 // bug 4788986.
2237 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2238 if (VerifyDuringStartup) {
2239 warning("Heap verification at start-up disabled "
2240 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2241 VerifyDuringStartup = false; // Disable verification at start-up
2242 }
2243
2244 if (VerifyBeforeExit) {
2245 warning("Heap verification at shutdown disabled "
2246 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2247 VerifyBeforeExit = false; // Disable verification at shutdown
2248 }
2249 }
2250
2251 if (PrintNMTStatistics) {
2252 #if INCLUDE_NMT
2253 if (MemTracker::tracking_level() == NMT_off) {
2254 #endif // INCLUDE_NMT
2255 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2256 PrintNMTStatistics = false;
2257 #if INCLUDE_NMT
2258 }
2259 #endif
2260 }
2261
2262 #if INCLUDE_JVMCI
2263 status = status && check_jvmci_args_consistency();
2264
2265 if (EnableJVMCI) {
2266 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2267 AddProperty, UnwriteableProperty, InternalProperty);
2268
2269 if (!ScavengeRootsInCode) {
2270 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2271 ScavengeRootsInCode = 1;
2272 }
2273 }
2274 #endif
2275
2276 // Check lower bounds of the code cache
2277 // Template Interpreter code is approximately 3X larger in debug builds.
2278 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2279 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2280 jio_fprintf(defaultStream::error_stream(),
2281 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2282 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2283 status = false;
2284 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2285 jio_fprintf(defaultStream::error_stream(),
2286 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2287 min_code_cache_size/K);
2288 status = false;
2289 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2290 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2291 jio_fprintf(defaultStream::error_stream(),
2292 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2293 CODE_CACHE_SIZE_LIMIT/M);
2294 status = false;
2295 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2296 jio_fprintf(defaultStream::error_stream(),
2297 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2298 min_code_cache_size/K);
2299 status = false;
2300 }
2301
2302 #ifdef _LP64
2303 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2304 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2305 }
2306 #endif
2307
2308 #ifndef SUPPORT_RESERVED_STACK_AREA
2309 if (StackReservedPages != 0) {
2310 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2311 warning("Reserved Stack Area not supported on this platform");
2312 }
2313 #endif
2314
2315 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2316 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2317 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2318 }
2319 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2320 }
2321 if (UseCompiler && is_interpreter_only()) {
2322 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2323 warning("UseCompiler disabled due to -Xint.");
2324 }
2325 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2326 }
2327 #ifdef COMPILER2
2328 if (PostLoopMultiversioning && !RangeCheckElimination) {
2329 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2330 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2331 }
2332 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2333 }
2334 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2335 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2336 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2337 }
2338 LoopStripMiningIter = 1;
2339 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2340 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2341 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2342 }
2343 LoopStripMiningIter = 0;
2344 }
2345 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2346 // blind guess
2347 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2348 }
2349 #endif
2350 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2351 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2352 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2353 }
2354 }
2355 return status;
2356 }
2357
2358 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2359 const char* option_type) {
2360 if (ignore) return false;
2361
2362 const char* spacer = " ";
2363 if (option_type == NULL) {
2364 option_type = ++spacer; // Set both to the empty string.
2365 }
2366
2367 if (os::obsolete_option(option)) {
2368 jio_fprintf(defaultStream::error_stream(),
2369 "Obsolete %s%soption: %s\n", option_type, spacer,
2370 option->optionString);
2371 return false;
2372 } else {
2373 jio_fprintf(defaultStream::error_stream(),
2374 "Unrecognized %s%soption: %s\n", option_type, spacer,
2375 option->optionString);
2376 return true;
2377 }
2378 }
2379
2380 static const char* user_assertion_options[] = {
2381 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2382 };
2383
2384 static const char* system_assertion_options[] = {
2385 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2386 };
2387
2388 bool Arguments::parse_uintx(const char* value,
2389 uintx* uintx_arg,
2390 uintx min_size) {
2391
2392 // Check the sign first since atojulong() parses only unsigned values.
2393 bool value_is_positive = !(*value == '-');
2394
2395 if (value_is_positive) {
2396 julong n;
2397 bool good_return = atojulong(value, &n);
2398 if (good_return) {
2399 bool above_minimum = n >= min_size;
2400 bool value_is_too_large = n > max_uintx;
2401
2402 if (above_minimum && !value_is_too_large) {
2403 *uintx_arg = n;
2404 return true;
2405 }
2406 }
2407 }
2408 return false;
2409 }
2410
2411 unsigned int addreads_count = 0;
2412 unsigned int addexports_count = 0;
2413 unsigned int addopens_count = 0;
2414 unsigned int addmods_count = 0;
2415 unsigned int patch_mod_count = 0;
2416
2417 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2418 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2419 char* property = AllocateHeap(prop_len, mtArguments);
2420 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2421 if (ret < 0 || ret >= (int)prop_len) {
2422 FreeHeap(property);
2423 return false;
2424 }
2425 bool added = add_property(property, UnwriteableProperty, internal);
2426 FreeHeap(property);
2427 return added;
2428 }
2429
2430 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2431 const unsigned int props_count_limit = 1000;
2432 const int max_digits = 3;
2433 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2434
2435 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2436 if (count < props_count_limit) {
2437 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2438 char* property = AllocateHeap(prop_len, mtArguments);
2439 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2440 if (ret < 0 || ret >= (int)prop_len) {
2441 FreeHeap(property);
2442 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2443 return false;
2444 }
2445 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2446 FreeHeap(property);
2447 return added;
2448 }
2449
2450 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2451 return false;
2452 }
2453
2454 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2455 julong* long_arg,
2456 julong min_size,
2457 julong max_size) {
2458 if (!atojulong(s, long_arg)) return arg_unreadable;
2459 return check_memory_size(*long_arg, min_size, max_size);
2460 }
2461
2462 // Parse JavaVMInitArgs structure
2463
2464 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2465 const JavaVMInitArgs *java_options_args,
2466 const JavaVMInitArgs *cmd_line_args) {
2467 bool patch_mod_javabase = false;
2468
2469 // Save default settings for some mode flags
2470 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2471 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2472 Arguments::_ClipInlining = ClipInlining;
2473 Arguments::_BackgroundCompilation = BackgroundCompilation;
2474 if (TieredCompilation) {
2475 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2476 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2477 }
2478
2479 // Setup flags for mixed which is the default
2480 set_mode_flags(_mixed);
2481
2482 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2483 // variable (if present).
2484 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2485 if (result != JNI_OK) {
2486 return result;
2487 }
2488
2489 // Parse args structure generated from the command line flags.
2490 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2491 if (result != JNI_OK) {
2492 return result;
2493 }
2494
2495 // Parse args structure generated from the _JAVA_OPTIONS environment
2496 // variable (if present) (mimics classic VM)
2497 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2498 if (result != JNI_OK) {
2499 return result;
2500 }
2501
2502 // We need to ensure processor and memory resources have been properly
2503 // configured - which may rely on arguments we just processed - before
2504 // doing the final argument processing. Any argument processing that
2505 // needs to know about processor and memory resources must occur after
2506 // this point.
2507
2508 os::init_container_support();
2509
2510 // Do final processing now that all arguments have been parsed
2511 result = finalize_vm_init_args(patch_mod_javabase);
2512 if (result != JNI_OK) {
2513 return result;
2514 }
2515
2516 return JNI_OK;
2517 }
2518
2519 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2520 // represents a valid JDWP agent. is_path==true denotes that we
2521 // are dealing with -agentpath (case where name is a path), otherwise with
2522 // -agentlib
2523 bool valid_jdwp_agent(char *name, bool is_path) {
2524 char *_name;
2525 const char *_jdwp = "jdwp";
2526 size_t _len_jdwp, _len_prefix;
2527
2528 if (is_path) {
2529 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2530 return false;
2531 }
2532
2533 _name++; // skip past last path separator
2534 _len_prefix = strlen(JNI_LIB_PREFIX);
2535
2536 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2537 return false;
2538 }
2539
2540 _name += _len_prefix;
2541 _len_jdwp = strlen(_jdwp);
2542
2543 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2544 _name += _len_jdwp;
2545 }
2546 else {
2547 return false;
2548 }
2549
2550 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2551 return false;
2552 }
2553
2554 return true;
2555 }
2556
2557 if (strcmp(name, _jdwp) == 0) {
2558 return true;
2559 }
2560
2561 return false;
2562 }
2563
2564 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2565 // --patch-module=<module>=<file>(<pathsep><file>)*
2566 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2567 // Find the equal sign between the module name and the path specification
2568 const char* module_equal = strchr(patch_mod_tail, '=');
2569 if (module_equal == NULL) {
2570 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2571 return JNI_ERR;
2572 } else {
2573 // Pick out the module name
2574 size_t module_len = module_equal - patch_mod_tail;
2575 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2576 if (module_name != NULL) {
2577 memcpy(module_name, patch_mod_tail, module_len);
2578 *(module_name + module_len) = '\0';
2579 // The path piece begins one past the module_equal sign
2580 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2581 FREE_C_HEAP_ARRAY(char, module_name);
2582 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2583 return JNI_ENOMEM;
2584 }
2585 } else {
2586 return JNI_ENOMEM;
2587 }
2588 }
2589 return JNI_OK;
2590 }
2591
2592 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2593 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2594 // The min and max sizes match the values in globals.hpp, but scaled
2595 // with K. The values have been chosen so that alignment with page
2596 // size doesn't change the max value, which makes the conversions
2597 // back and forth between Xss value and ThreadStackSize value easier.
2598 // The values have also been chosen to fit inside a 32-bit signed type.
2599 const julong min_ThreadStackSize = 0;
2600 const julong max_ThreadStackSize = 1 * M;
2601
2602 const julong min_size = min_ThreadStackSize * K;
2603 const julong max_size = max_ThreadStackSize * K;
2604
2605 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2606
2607 julong size = 0;
2608 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2609 if (errcode != arg_in_range) {
2610 bool silent = (option == NULL); // Allow testing to silence error messages
2611 if (!silent) {
2612 jio_fprintf(defaultStream::error_stream(),
2613 "Invalid thread stack size: %s\n", option->optionString);
2614 describe_range_error(errcode);
2615 }
2616 return JNI_EINVAL;
2617 }
2618
2619 // Internally track ThreadStackSize in units of 1024 bytes.
2620 const julong size_aligned = align_up(size, K);
2621 assert(size <= size_aligned,
2622 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2623 size, size_aligned);
2624
2625 const julong size_in_K = size_aligned / K;
2626 assert(size_in_K < (julong)max_intx,
2627 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2628 size_in_K);
2629
2630 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2631 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2632 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2633 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2634 max_expanded, size_in_K);
2635
2636 *out_ThreadStackSize = (intx)size_in_K;
2637
2638 return JNI_OK;
2639 }
2640
2641 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2642 // For match_option to return remaining or value part of option string
2643 const char* tail;
2644
2645 // iterate over arguments
2646 for (int index = 0; index < args->nOptions; index++) {
2647 bool is_absolute_path = false; // for -agentpath vs -agentlib
2648
2649 const JavaVMOption* option = args->options + index;
2650
2651 if (!match_option(option, "-Djava.class.path", &tail) &&
2652 !match_option(option, "-Dsun.java.command", &tail) &&
2653 !match_option(option, "-Dsun.java.launcher", &tail)) {
2654
2655 // add all jvm options to the jvm_args string. This string
2656 // is used later to set the java.vm.args PerfData string constant.
2657 // the -Djava.class.path and the -Dsun.java.command options are
2658 // omitted from jvm_args string as each have their own PerfData
2659 // string constant object.
2660 build_jvm_args(option->optionString);
2661 }
2662
2663 // -verbose:[class/module/gc/jni]
2664 if (match_option(option, "-verbose", &tail)) {
2665 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2666 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2667 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2668 } else if (!strcmp(tail, ":module")) {
2669 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2670 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2671 } else if (!strcmp(tail, ":gc")) {
2672 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2673 } else if (!strcmp(tail, ":jni")) {
2674 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2675 return JNI_EINVAL;
2676 }
2677 }
2678 // -da / -ea / -disableassertions / -enableassertions
2679 // These accept an optional class/package name separated by a colon, e.g.,
2680 // -da:java.lang.Thread.
2681 } else if (match_option(option, user_assertion_options, &tail, true)) {
2682 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2683 if (*tail == '\0') {
2684 JavaAssertions::setUserClassDefault(enable);
2685 } else {
2686 assert(*tail == ':', "bogus match by match_option()");
2687 JavaAssertions::addOption(tail + 1, enable);
2688 }
2689 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2690 } else if (match_option(option, system_assertion_options, &tail, false)) {
2691 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2692 JavaAssertions::setSystemClassDefault(enable);
2693 // -bootclasspath:
2694 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2695 jio_fprintf(defaultStream::output_stream(),
2696 "-Xbootclasspath is no longer a supported option.\n");
2697 return JNI_EINVAL;
2698 // -bootclasspath/a:
2699 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2700 Arguments::append_sysclasspath(tail);
2701 // -bootclasspath/p:
2702 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2703 jio_fprintf(defaultStream::output_stream(),
2704 "-Xbootclasspath/p is no longer a supported option.\n");
2705 return JNI_EINVAL;
2706 // -Xrun
2707 } else if (match_option(option, "-Xrun", &tail)) {
2708 if (tail != NULL) {
2709 const char* pos = strchr(tail, ':');
2710 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2711 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2712 jio_snprintf(name, len + 1, "%s", tail);
2713
2714 char *options = NULL;
2715 if(pos != NULL) {
2716 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2717 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2718 }
2719 #if !INCLUDE_JVMTI
2720 if (strcmp(name, "jdwp") == 0) {
2721 jio_fprintf(defaultStream::error_stream(),
2722 "Debugging agents are not supported in this VM\n");
2723 return JNI_ERR;
2724 }
2725 #endif // !INCLUDE_JVMTI
2726 add_init_library(name, options);
2727 }
2728 } else if (match_option(option, "--add-reads=", &tail)) {
2729 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2730 return JNI_ENOMEM;
2731 }
2732 } else if (match_option(option, "--add-exports=", &tail)) {
2733 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2734 return JNI_ENOMEM;
2735 }
2736 } else if (match_option(option, "--add-opens=", &tail)) {
2737 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2738 return JNI_ENOMEM;
2739 }
2740 } else if (match_option(option, "--add-modules=", &tail)) {
2741 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2742 return JNI_ENOMEM;
2743 }
2744 } else if (match_option(option, "--limit-modules=", &tail)) {
2745 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2746 return JNI_ENOMEM;
2747 }
2748 } else if (match_option(option, "--module-path=", &tail)) {
2749 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2750 return JNI_ENOMEM;
2751 }
2752 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2753 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2754 return JNI_ENOMEM;
2755 }
2756 } else if (match_option(option, "--patch-module=", &tail)) {
2757 // --patch-module=<module>=<file>(<pathsep><file>)*
2758 int res = process_patch_mod_option(tail, patch_mod_javabase);
2759 if (res != JNI_OK) {
2760 return res;
2761 }
2762 } else if (match_option(option, "--illegal-access=", &tail)) {
2763 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2764 return JNI_ENOMEM;
2765 }
2766 // -agentlib and -agentpath
2767 } else if (match_option(option, "-agentlib:", &tail) ||
2768 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2769 if(tail != NULL) {
2770 const char* pos = strchr(tail, '=');
2771 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2772 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2773 name[len] = '\0';
2774
2775 char *options = NULL;
2776 if(pos != NULL) {
2777 options = os::strdup_check_oom(pos + 1, mtArguments);
2778 }
2779 #if !INCLUDE_JVMTI
2780 if (valid_jdwp_agent(name, is_absolute_path)) {
2781 jio_fprintf(defaultStream::error_stream(),
2782 "Debugging agents are not supported in this VM\n");
2783 return JNI_ERR;
2784 }
2785 #endif // !INCLUDE_JVMTI
2786 add_init_agent(name, options, is_absolute_path);
2787 }
2788 // -javaagent
2789 } else if (match_option(option, "-javaagent:", &tail)) {
2790 #if !INCLUDE_JVMTI
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Instrumentation agents are not supported in this VM\n");
2793 return JNI_ERR;
2794 #else
2795 if (tail != NULL) {
2796 size_t length = strlen(tail) + 1;
2797 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2798 jio_snprintf(options, length, "%s", tail);
2799 add_instrument_agent("instrument", options, false);
2800 // java agents need module java.instrument
2801 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2802 return JNI_ENOMEM;
2803 }
2804 }
2805 #endif // !INCLUDE_JVMTI
2806 // -Xnoclassgc
2807 } else if (match_option(option, "-Xnoclassgc")) {
2808 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2809 return JNI_EINVAL;
2810 }
2811 // -Xconcgc
2812 } else if (match_option(option, "-Xconcgc")) {
2813 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2814 return JNI_EINVAL;
2815 }
2816 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2817 // -Xnoconcgc
2818 } else if (match_option(option, "-Xnoconcgc")) {
2819 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2820 return JNI_EINVAL;
2821 }
2822 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2823 // -Xbatch
2824 } else if (match_option(option, "-Xbatch")) {
2825 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 // -Xmn for compatibility with other JVM vendors
2829 } else if (match_option(option, "-Xmn", &tail)) {
2830 julong long_initial_young_size = 0;
2831 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2832 if (errcode != arg_in_range) {
2833 jio_fprintf(defaultStream::error_stream(),
2834 "Invalid initial young generation size: %s\n", option->optionString);
2835 describe_range_error(errcode);
2836 return JNI_EINVAL;
2837 }
2838 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2842 return JNI_EINVAL;
2843 }
2844 // -Xms
2845 } else if (match_option(option, "-Xms", &tail)) {
2846 julong long_initial_heap_size = 0;
2847 // an initial heap size of 0 means automatically determine
2848 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2849 if (errcode != arg_in_range) {
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Invalid initial heap size: %s\n", option->optionString);
2852 describe_range_error(errcode);
2853 return JNI_EINVAL;
2854 }
2855 set_min_heap_size((size_t)long_initial_heap_size);
2856 // Currently the minimum size and the initial heap sizes are the same.
2857 // Can be overridden with -XX:InitialHeapSize.
2858 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 // -Xmx
2862 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2863 julong long_max_heap_size = 0;
2864 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2865 if (errcode != arg_in_range) {
2866 jio_fprintf(defaultStream::error_stream(),
2867 "Invalid maximum heap size: %s\n", option->optionString);
2868 describe_range_error(errcode);
2869 return JNI_EINVAL;
2870 }
2871 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2872 return JNI_EINVAL;
2873 }
2874 // Xmaxf
2875 } else if (match_option(option, "-Xmaxf", &tail)) {
2876 char* err;
2877 int maxf = (int)(strtod(tail, &err) * 100);
2878 if (*err != '\0' || *tail == '\0') {
2879 jio_fprintf(defaultStream::error_stream(),
2880 "Bad max heap free percentage size: %s\n",
2881 option->optionString);
2882 return JNI_EINVAL;
2883 } else {
2884 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 }
2888 // Xminf
2889 } else if (match_option(option, "-Xminf", &tail)) {
2890 char* err;
2891 int minf = (int)(strtod(tail, &err) * 100);
2892 if (*err != '\0' || *tail == '\0') {
2893 jio_fprintf(defaultStream::error_stream(),
2894 "Bad min heap free percentage size: %s\n",
2895 option->optionString);
2896 return JNI_EINVAL;
2897 } else {
2898 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2899 return JNI_EINVAL;
2900 }
2901 }
2902 // -Xss
2903 } else if (match_option(option, "-Xss", &tail)) {
2904 intx value = 0;
2905 jint err = parse_xss(option, tail, &value);
2906 if (err != JNI_OK) {
2907 return err;
2908 }
2909 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2910 return JNI_EINVAL;
2911 }
2912 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2913 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2914 julong long_ReservedCodeCacheSize = 0;
2915
2916 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2917 if (errcode != arg_in_range) {
2918 jio_fprintf(defaultStream::error_stream(),
2919 "Invalid maximum code cache size: %s.\n", option->optionString);
2920 return JNI_EINVAL;
2921 }
2922 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 // -green
2926 } else if (match_option(option, "-green")) {
2927 jio_fprintf(defaultStream::error_stream(),
2928 "Green threads support not available\n");
2929 return JNI_EINVAL;
2930 // -native
2931 } else if (match_option(option, "-native")) {
2932 // HotSpot always uses native threads, ignore silently for compatibility
2933 // -Xrs
2934 } else if (match_option(option, "-Xrs")) {
2935 // Classic/EVM option, new functionality
2936 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 // -Xprof
2940 } else if (match_option(option, "-Xprof")) {
2941 char version[256];
2942 // Obsolete in JDK 10
2943 JDK_Version::jdk(10).to_string(version, sizeof(version));
2944 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2945 // -Xconcurrentio
2946 } else if (match_option(option, "-Xconcurrentio")) {
2947 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2954 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2958 return JNI_EINVAL;
2959 }
2960
2961 // -Xinternalversion
2962 } else if (match_option(option, "-Xinternalversion")) {
2963 jio_fprintf(defaultStream::output_stream(), "%s\n",
2964 VM_Version::internal_vm_info_string());
2965 vm_exit(0);
2966 #ifndef PRODUCT
2967 // -Xprintflags
2968 } else if (match_option(option, "-Xprintflags")) {
2969 CommandLineFlags::printFlags(tty, false);
2970 vm_exit(0);
2971 #endif
2972 // -D
2973 } else if (match_option(option, "-D", &tail)) {
2974 const char* value;
2975 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2976 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2977 // abort if -Djava.endorsed.dirs is set
2978 jio_fprintf(defaultStream::output_stream(),
2979 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2980 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2981 return JNI_EINVAL;
2982 }
2983 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2984 *value != '\0' && strcmp(value, "\"\"") != 0) {
2985 // abort if -Djava.ext.dirs is set
2986 jio_fprintf(defaultStream::output_stream(),
2987 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2988 return JNI_EINVAL;
2989 }
2990 // Check for module related properties. They must be set using the modules
2991 // options. For example: use "--add-modules=java.sql", not
2992 // "-Djdk.module.addmods=java.sql"
2993 if (is_internal_module_property(option->optionString + 2)) {
2994 needs_module_property_warning = true;
2995 continue;
2996 }
2997
2998 if (!add_property(tail)) {
2999 return JNI_ENOMEM;
3000 }
3001 // Out of the box management support
3002 if (match_option(option, "-Dcom.sun.management", &tail)) {
3003 #if INCLUDE_MANAGEMENT
3004 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3005 return JNI_EINVAL;
3006 }
3007 // management agent in module jdk.management.agent
3008 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3009 return JNI_ENOMEM;
3010 }
3011 #else
3012 jio_fprintf(defaultStream::output_stream(),
3013 "-Dcom.sun.management is not supported in this VM.\n");
3014 return JNI_ERR;
3015 #endif
3016 }
3017 // -Xint
3018 } else if (match_option(option, "-Xint")) {
3019 set_mode_flags(_int);
3020 // -Xmixed
3021 } else if (match_option(option, "-Xmixed")) {
3022 set_mode_flags(_mixed);
3023 // -Xcomp
3024 } else if (match_option(option, "-Xcomp")) {
3025 // for testing the compiler; turn off all flags that inhibit compilation
3026 set_mode_flags(_comp);
3027 // -Xshare:dump
3028 } else if (match_option(option, "-Xshare:dump")) {
3029 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3030 return JNI_EINVAL;
3031 }
3032 set_mode_flags(_int); // Prevent compilation, which creates objects
3033 // -Xshare:on
3034 } else if (match_option(option, "-Xshare:on")) {
3035 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3036 return JNI_EINVAL;
3037 }
3038 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 // -Xshare:auto
3042 } else if (match_option(option, "-Xshare:auto")) {
3043 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3044 return JNI_EINVAL;
3045 }
3046 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 // -Xshare:off
3050 } else if (match_option(option, "-Xshare:off")) {
3051 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3052 return JNI_EINVAL;
3053 }
3054 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 // -Xverify
3058 } else if (match_option(option, "-Xverify", &tail)) {
3059 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3060 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3061 return JNI_EINVAL;
3062 }
3063 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3064 return JNI_EINVAL;
3065 }
3066 } else if (strcmp(tail, ":remote") == 0) {
3067 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 } else if (strcmp(tail, ":none") == 0) {
3074 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3081 return JNI_EINVAL;
3082 }
3083 // -Xdebug
3084 } else if (match_option(option, "-Xdebug")) {
3085 // note this flag has been used, then ignore
3086 set_xdebug_mode(true);
3087 // -Xnoagent
3088 } else if (match_option(option, "-Xnoagent")) {
3089 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3090 } else if (match_option(option, "-Xloggc:", &tail)) {
3091 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3092 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3093 _gc_log_filename = os::strdup_check_oom(tail);
3094 } else if (match_option(option, "-Xlog", &tail)) {
3095 bool ret = false;
3096 if (strcmp(tail, ":help") == 0) {
3097 fileStream stream(defaultStream::output_stream());
3098 LogConfiguration::print_command_line_help(&stream);
3099 vm_exit(0);
3100 } else if (strcmp(tail, ":disable") == 0) {
3101 LogConfiguration::disable_logging();
3102 ret = true;
3103 } else if (*tail == '\0') {
3104 ret = LogConfiguration::parse_command_line_arguments();
3105 assert(ret, "-Xlog without arguments should never fail to parse");
3106 } else if (*tail == ':') {
3107 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3108 }
3109 if (ret == false) {
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
3112 tail);
3113 return JNI_EINVAL;
3114 }
3115 // JNI hooks
3116 } else if (match_option(option, "-Xcheck", &tail)) {
3117 if (!strcmp(tail, ":jni")) {
3118 #if !INCLUDE_JNI_CHECK
3119 warning("JNI CHECKING is not supported in this VM");
3120 #else
3121 CheckJNICalls = true;
3122 #endif // INCLUDE_JNI_CHECK
3123 } else if (is_bad_option(option, args->ignoreUnrecognized,
3124 "check")) {
3125 return JNI_EINVAL;
3126 }
3127 } else if (match_option(option, "vfprintf")) {
3128 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3129 } else if (match_option(option, "exit")) {
3130 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3131 } else if (match_option(option, "abort")) {
3132 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3133 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3134 // and the last option wins.
3135 } else if (match_option(option, "-XX:+NeverTenure")) {
3136 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3137 return JNI_EINVAL;
3138 }
3139 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3140 return JNI_EINVAL;
3141 }
3142 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3146 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3156 uintx max_tenuring_thresh = 0;
3157 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3160 return JNI_EINVAL;
3161 }
3162
3163 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3164 return JNI_EINVAL;
3165 }
3166
3167 if (MaxTenuringThreshold == 0) {
3168 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3169 return JNI_EINVAL;
3170 }
3171 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 } else {
3175 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3176 return JNI_EINVAL;
3177 }
3178 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3179 return JNI_EINVAL;
3180 }
3181 }
3182 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3183 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3190 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3191 return JNI_EINVAL;
3192 }
3193 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3194 return JNI_EINVAL;
3195 }
3196 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3197 #if defined(DTRACE_ENABLED)
3198 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3205 return JNI_EINVAL;
3206 }
3207 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3208 return JNI_EINVAL;
3209 }
3210 #else // defined(DTRACE_ENABLED)
3211 jio_fprintf(defaultStream::error_stream(),
3212 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3213 return JNI_EINVAL;
3214 #endif // defined(DTRACE_ENABLED)
3215 #ifdef ASSERT
3216 } else if (match_option(option, "-XX:+FullGCALot")) {
3217 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3218 return JNI_EINVAL;
3219 }
3220 // disable scavenge before parallel mark-compact
3221 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3222 return JNI_EINVAL;
3223 }
3224 #endif
3225 #if !INCLUDE_MANAGEMENT
3226 } else if (match_option(option, "-XX:+ManagementServer")) {
3227 jio_fprintf(defaultStream::error_stream(),
3228 "ManagementServer is not supported in this VM.\n");
3229 return JNI_ERR;
3230 #endif // INCLUDE_MANAGEMENT
3231 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3232 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3233 // already been handled
3234 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3235 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3236 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3237 return JNI_EINVAL;
3238 }
3239 }
3240 // Unknown option
3241 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3242 return JNI_ERR;
3243 }
3244 }
3245
3246 // PrintSharedArchiveAndExit will turn on
3247 // -Xshare:on
3248 // -Xlog:class+path=info
3249 if (PrintSharedArchiveAndExit) {
3250 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3251 return JNI_EINVAL;
3252 }
3253 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3254 return JNI_EINVAL;
3255 }
3256 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3257 }
3258
3259 // Change the default value for flags which have different default values
3260 // when working with older JDKs.
3261 #ifdef LINUX
3262 if (JDK_Version::current().compare_major(6) <= 0 &&
3263 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3264 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3265 }
3266 #endif // LINUX
3267 fix_appclasspath();
3268 return JNI_OK;
3269 }
3270
3271 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3272 // For java.base check for duplicate --patch-module options being specified on the command line.
3273 // This check is only required for java.base, all other duplicate module specifications
3274 // will be checked during module system initialization. The module system initialization
3275 // will throw an ExceptionInInitializerError if this situation occurs.
3276 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3277 if (*patch_mod_javabase) {
3278 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3279 } else {
3280 *patch_mod_javabase = true;
3281 }
3282 }
3283
3284 // Create GrowableArray lazily, only if --patch-module has been specified
3285 if (_patch_mod_prefix == NULL) {
3286 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3287 }
3288
3289 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3290 }
3291
3292 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3293 //
3294 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3295 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3296 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3297 // path is treated as the current directory.
3298 //
3299 // This causes problems with CDS, which requires that all directories specified in the classpath
3300 // must be empty. In most cases, applications do NOT want to load classes from the current
3301 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3302 // scripts compatible with CDS.
3303 void Arguments::fix_appclasspath() {
3304 if (IgnoreEmptyClassPaths) {
3305 const char separator = *os::path_separator();
3306 const char* src = _java_class_path->value();
3307
3308 // skip over all the leading empty paths
3309 while (*src == separator) {
3310 src ++;
3311 }
3312
3313 char* copy = os::strdup_check_oom(src, mtArguments);
3314
3315 // trim all trailing empty paths
3316 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3317 *tail = '\0';
3318 }
3319
3320 char from[3] = {separator, separator, '\0'};
3321 char to [2] = {separator, '\0'};
3322 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3323 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3324 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3325 }
3326
3327 _java_class_path->set_writeable_value(copy);
3328 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3329 }
3330 }
3331
3332 static bool has_jar_files(const char* directory) {
3333 DIR* dir = os::opendir(directory);
3334 if (dir == NULL) return false;
3335
3336 struct dirent *entry;
3337 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3338 bool hasJarFile = false;
3339 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3340 const char* name = entry->d_name;
3341 const char* ext = name + strlen(name) - 4;
3342 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3343 }
3344 FREE_C_HEAP_ARRAY(char, dbuf);
3345 os::closedir(dir);
3346 return hasJarFile ;
3347 }
3348
3349 static int check_non_empty_dirs(const char* path) {
3350 const char separator = *os::path_separator();
3351 const char* const end = path + strlen(path);
3352 int nonEmptyDirs = 0;
3353 while (path < end) {
3354 const char* tmp_end = strchr(path, separator);
3355 if (tmp_end == NULL) {
3356 if (has_jar_files(path)) {
3357 nonEmptyDirs++;
3358 jio_fprintf(defaultStream::output_stream(),
3359 "Non-empty directory: %s\n", path);
3360 }
3361 path = end;
3362 } else {
3363 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3364 memcpy(dirpath, path, tmp_end - path);
3365 dirpath[tmp_end - path] = '\0';
3366 if (has_jar_files(dirpath)) {
3367 nonEmptyDirs++;
3368 jio_fprintf(defaultStream::output_stream(),
3369 "Non-empty directory: %s\n", dirpath);
3370 }
3371 FREE_C_HEAP_ARRAY(char, dirpath);
3372 path = tmp_end + 1;
3373 }
3374 }
3375 return nonEmptyDirs;
3376 }
3377
3378 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3379 // check if the default lib/endorsed directory exists; if so, error
3380 char path[JVM_MAXPATHLEN];
3381 const char* fileSep = os::file_separator();
3382 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3383
3384 if (CheckEndorsedAndExtDirs) {
3385 int nonEmptyDirs = 0;
3386 // check endorsed directory
3387 nonEmptyDirs += check_non_empty_dirs(path);
3388 // check the extension directories
3389 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3390 if (nonEmptyDirs > 0) {
3391 return JNI_ERR;
3392 }
3393 }
3394
3395 DIR* dir = os::opendir(path);
3396 if (dir != NULL) {
3397 jio_fprintf(defaultStream::output_stream(),
3398 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3399 "in modular form will be supported via the concept of upgradeable modules.\n");
3400 os::closedir(dir);
3401 return JNI_ERR;
3402 }
3403
3404 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3405 dir = os::opendir(path);
3406 if (dir != NULL) {
3407 jio_fprintf(defaultStream::output_stream(),
3408 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3409 "Use -classpath instead.\n.");
3410 os::closedir(dir);
3411 return JNI_ERR;
3412 }
3413
3414 // This must be done after all arguments have been processed
3415 // and the container support has been initialized since AggressiveHeap
3416 // relies on the amount of total memory available.
3417 if (AggressiveHeap) {
3418 jint result = set_aggressive_heap_flags();
3419 if (result != JNI_OK) {
3420 return result;
3421 }
3422 }
3423
3424 // This must be done after all arguments have been processed.
3425 // java_compiler() true means set to "NONE" or empty.
3426 if (java_compiler() && !xdebug_mode()) {
3427 // For backwards compatibility, we switch to interpreted mode if
3428 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3429 // not specified.
3430 set_mode_flags(_int);
3431 }
3432
3433 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3434 // but like -Xint, leave compilation thresholds unaffected.
3435 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3436 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3437 set_mode_flags(_int);
3438 }
3439
3440 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3441 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3442 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3443 }
3444
3445 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3446 // Don't degrade server performance for footprint
3447 if (FLAG_IS_DEFAULT(UseLargePages) &&
3448 MaxHeapSize < LargePageHeapSizeThreshold) {
3449 // No need for large granularity pages w/small heaps.
3450 // Note that large pages are enabled/disabled for both the
3451 // Java heap and the code cache.
3452 FLAG_SET_DEFAULT(UseLargePages, false);
3453 }
3454
3455 #elif defined(COMPILER2)
3456 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3457 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3458 }
3459 #endif
3460
3461 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3462 UNSUPPORTED_OPTION(ProfileInterpreter);
3463 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3464 #endif
3465
3466 #ifndef TIERED
3467 // Tiered compilation is undefined.
3468 UNSUPPORTED_OPTION(TieredCompilation);
3469 #endif
3470
3471 #if INCLUDE_JVMCI
3472 if (EnableJVMCI &&
3473 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3474 return JNI_ENOMEM;
3475 }
3476 #endif
3477
3478 if (!check_vm_args_consistency()) {
3479 return JNI_ERR;
3480 }
3481
3482 #if INCLUDE_JVMCI
3483 if (UseJVMCICompiler) {
3484 Compilation_mode = CompMode_server;
3485 }
3486 #endif
3487
3488 #if INCLUDE_CDS
3489 if (DumpSharedSpaces) {
3490 // Disable biased locking now as it interferes with the clean up of
3491 // the archived Klasses and Java string objects (at dump time only).
3492 UseBiasedLocking = false;
3493 }
3494 if (UseSharedSpaces && patch_mod_javabase) {
3495 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3496 }
3497 #endif
3498
3499 return JNI_OK;
3500 }
3501
3502 // Helper class for controlling the lifetime of JavaVMInitArgs
3503 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3504 // deleted on the destruction of the ScopedVMInitArgs object.
3505 class ScopedVMInitArgs : public StackObj {
3506 private:
3507 JavaVMInitArgs _args;
3508 char* _container_name;
3509 bool _is_set;
3510 char* _vm_options_file_arg;
3511
3512 public:
3513 ScopedVMInitArgs(const char *container_name) {
3514 _args.version = JNI_VERSION_1_2;
3515 _args.nOptions = 0;
3516 _args.options = NULL;
3517 _args.ignoreUnrecognized = false;
3518 _container_name = (char *)container_name;
3519 _is_set = false;
3520 _vm_options_file_arg = NULL;
3521 }
3522
3523 // Populates the JavaVMInitArgs object represented by this
3524 // ScopedVMInitArgs object with the arguments in options. The
3525 // allocated memory is deleted by the destructor. If this method
3526 // returns anything other than JNI_OK, then this object is in a
3527 // partially constructed state, and should be abandoned.
3528 jint set_args(GrowableArray<JavaVMOption>* options) {
3529 _is_set = true;
3530 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3531 JavaVMOption, options->length(), mtArguments);
3532 if (options_arr == NULL) {
3533 return JNI_ENOMEM;
3534 }
3535 _args.options = options_arr;
3536
3537 for (int i = 0; i < options->length(); i++) {
3538 options_arr[i] = options->at(i);
3539 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3540 if (options_arr[i].optionString == NULL) {
3541 // Rely on the destructor to do cleanup.
3542 _args.nOptions = i;
3543 return JNI_ENOMEM;
3544 }
3545 }
3546
3547 _args.nOptions = options->length();
3548 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3549 return JNI_OK;
3550 }
3551
3552 JavaVMInitArgs* get() { return &_args; }
3553 char* container_name() { return _container_name; }
3554 bool is_set() { return _is_set; }
3555 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3556 char* vm_options_file_arg() { return _vm_options_file_arg; }
3557
3558 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3559 if (_vm_options_file_arg != NULL) {
3560 os::free(_vm_options_file_arg);
3561 }
3562 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3563 }
3564
3565 ~ScopedVMInitArgs() {
3566 if (_vm_options_file_arg != NULL) {
3567 os::free(_vm_options_file_arg);
3568 }
3569 if (_args.options == NULL) return;
3570 for (int i = 0; i < _args.nOptions; i++) {
3571 os::free(_args.options[i].optionString);
3572 }
3573 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3574 }
3575
3576 // Insert options into this option list, to replace option at
3577 // vm_options_file_pos (-XX:VMOptionsFile)
3578 jint insert(const JavaVMInitArgs* args,
3579 const JavaVMInitArgs* args_to_insert,
3580 const int vm_options_file_pos) {
3581 assert(_args.options == NULL, "shouldn't be set yet");
3582 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3583 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3584
3585 int length = args->nOptions + args_to_insert->nOptions - 1;
3586 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3587 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3588 for (int i = 0; i < args->nOptions; i++) {
3589 if (i == vm_options_file_pos) {
3590 // insert the new options starting at the same place as the
3591 // -XX:VMOptionsFile option
3592 for (int j = 0; j < args_to_insert->nOptions; j++) {
3593 options->push(args_to_insert->options[j]);
3594 }
3595 } else {
3596 options->push(args->options[i]);
3597 }
3598 }
3599 // make into options array
3600 jint result = set_args(options);
3601 delete options;
3602 return result;
3603 }
3604 };
3605
3606 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3607 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3608 }
3609
3610 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3611 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3612 }
3613
3614 jint Arguments::parse_options_environment_variable(const char* name,
3615 ScopedVMInitArgs* vm_args) {
3616 char *buffer = ::getenv(name);
3617
3618 // Don't check this environment variable if user has special privileges
3619 // (e.g. unix su command).
3620 if (buffer == NULL || os::have_special_privileges()) {
3621 return JNI_OK;
3622 }
3623
3624 if ((buffer = os::strdup(buffer)) == NULL) {
3625 return JNI_ENOMEM;
3626 }
3627
3628 jio_fprintf(defaultStream::error_stream(),
3629 "Picked up %s: %s\n", name, buffer);
3630
3631 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3632
3633 os::free(buffer);
3634 return retcode;
3635 }
3636
3637 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3638 // read file into buffer
3639 int fd = ::open(file_name, O_RDONLY);
3640 if (fd < 0) {
3641 jio_fprintf(defaultStream::error_stream(),
3642 "Could not open options file '%s'\n",
3643 file_name);
3644 return JNI_ERR;
3645 }
3646
3647 struct stat stbuf;
3648 int retcode = os::stat(file_name, &stbuf);
3649 if (retcode != 0) {
3650 jio_fprintf(defaultStream::error_stream(),
3651 "Could not stat options file '%s'\n",
3652 file_name);
3653 os::close(fd);
3654 return JNI_ERR;
3655 }
3656
3657 if (stbuf.st_size == 0) {
3658 // tell caller there is no option data and that is ok
3659 os::close(fd);
3660 return JNI_OK;
3661 }
3662
3663 // '+ 1' for NULL termination even with max bytes
3664 size_t bytes_alloc = stbuf.st_size + 1;
3665
3666 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3667 if (NULL == buf) {
3668 jio_fprintf(defaultStream::error_stream(),
3669 "Could not allocate read buffer for options file parse\n");
3670 os::close(fd);
3671 return JNI_ENOMEM;
3672 }
3673
3674 memset(buf, 0, bytes_alloc);
3675
3676 // Fill buffer
3677 // Use ::read() instead of os::read because os::read()
3678 // might do a thread state transition
3679 // and it is too early for that here
3680
3681 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3682 os::close(fd);
3683 if (bytes_read < 0) {
3684 FREE_C_HEAP_ARRAY(char, buf);
3685 jio_fprintf(defaultStream::error_stream(),
3686 "Could not read options file '%s'\n", file_name);
3687 return JNI_ERR;
3688 }
3689
3690 if (bytes_read == 0) {
3691 // tell caller there is no option data and that is ok
3692 FREE_C_HEAP_ARRAY(char, buf);
3693 return JNI_OK;
3694 }
3695
3696 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3697
3698 FREE_C_HEAP_ARRAY(char, buf);
3699 return retcode;
3700 }
3701
3702 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3703 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3704
3705 // some pointers to help with parsing
3706 char *buffer_end = buffer + buf_len;
3707 char *opt_hd = buffer;
3708 char *wrt = buffer;
3709 char *rd = buffer;
3710
3711 // parse all options
3712 while (rd < buffer_end) {
3713 // skip leading white space from the input string
3714 while (rd < buffer_end && isspace(*rd)) {
3715 rd++;
3716 }
3717
3718 if (rd >= buffer_end) {
3719 break;
3720 }
3721
3722 // Remember this is where we found the head of the token.
3723 opt_hd = wrt;
3724
3725 // Tokens are strings of non white space characters separated
3726 // by one or more white spaces.
3727 while (rd < buffer_end && !isspace(*rd)) {
3728 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3729 int quote = *rd; // matching quote to look for
3730 rd++; // don't copy open quote
3731 while (rd < buffer_end && *rd != quote) {
3732 // include everything (even spaces)
3733 // up until the close quote
3734 *wrt++ = *rd++; // copy to option string
3735 }
3736
3737 if (rd < buffer_end) {
3738 rd++; // don't copy close quote
3739 } else {
3740 // did not see closing quote
3741 jio_fprintf(defaultStream::error_stream(),
3742 "Unmatched quote in %s\n", name);
3743 delete options;
3744 return JNI_ERR;
3745 }
3746 } else {
3747 *wrt++ = *rd++; // copy to option string
3748 }
3749 }
3750
3751 // steal a white space character and set it to NULL
3752 *wrt++ = '\0';
3753 // We now have a complete token
3754
3755 JavaVMOption option;
3756 option.optionString = opt_hd;
3757 option.extraInfo = NULL;
3758
3759 options->append(option); // Fill in option
3760
3761 rd++; // Advance to next character
3762 }
3763
3764 // Fill out JavaVMInitArgs structure.
3765 jint status = vm_args->set_args(options);
3766
3767 delete options;
3768 return status;
3769 }
3770
3771 void Arguments::set_shared_spaces_flags() {
3772 if (DumpSharedSpaces) {
3773 if (FailOverToOldVerifier) {
3774 // Don't fall back to the old verifier on verification failure. If a
3775 // class fails verification with the split verifier, it might fail the
3776 // CDS runtime verifier constraint check. In that case, we don't want
3777 // to share the class. We only archive classes that pass the split verifier.
3778 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3779 }
3780
3781 if (RequireSharedSpaces) {
3782 warning("Cannot dump shared archive while using shared archive");
3783 }
3784 UseSharedSpaces = false;
3785 #ifdef _LP64
3786 if (!UseCompressedOops || !UseCompressedClassPointers) {
3787 vm_exit_during_initialization(
3788 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3789 }
3790 } else {
3791 if (!UseCompressedOops || !UseCompressedClassPointers) {
3792 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3793 }
3794 #endif
3795 }
3796 }
3797
3798 // Sharing support
3799 // Construct the path to the archive
3800 static char* get_shared_archive_path() {
3801 char *shared_archive_path;
3802 if (SharedArchiveFile == NULL) {
3803 char jvm_path[JVM_MAXPATHLEN];
3804 os::jvm_path(jvm_path, sizeof(jvm_path));
3805 char *end = strrchr(jvm_path, *os::file_separator());
3806 if (end != NULL) *end = '\0';
3807 size_t jvm_path_len = strlen(jvm_path);
3808 size_t file_sep_len = strlen(os::file_separator());
3809 const size_t len = jvm_path_len + file_sep_len + 20;
3810 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3811 if (shared_archive_path != NULL) {
3812 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3813 jvm_path, os::file_separator());
3814 }
3815 } else {
3816 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3817 }
3818 return shared_archive_path;
3819 }
3820
3821 #ifndef PRODUCT
3822 // Determine whether LogVMOutput should be implicitly turned on.
3823 static bool use_vm_log() {
3824 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3825 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3826 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3827 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3828 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3829 return true;
3830 }
3831
3832 #ifdef COMPILER1
3833 if (PrintC1Statistics) {
3834 return true;
3835 }
3836 #endif // COMPILER1
3837
3838 #ifdef COMPILER2
3839 if (PrintOptoAssembly || PrintOptoStatistics) {
3840 return true;
3841 }
3842 #endif // COMPILER2
3843
3844 return false;
3845 }
3846
3847 #endif // PRODUCT
3848
3849 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3850 for (int index = 0; index < args->nOptions; index++) {
3851 const JavaVMOption* option = args->options + index;
3852 const char* tail;
3853 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3854 return true;
3855 }
3856 }
3857 return false;
3858 }
3859
3860 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3861 const char* vm_options_file,
3862 const int vm_options_file_pos,
3863 ScopedVMInitArgs* vm_options_file_args,
3864 ScopedVMInitArgs* args_out) {
3865 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3866 if (code != JNI_OK) {
3867 return code;
3868 }
3869
3870 if (vm_options_file_args->get()->nOptions < 1) {
3871 return JNI_OK;
3872 }
3873
3874 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3875 jio_fprintf(defaultStream::error_stream(),
3876 "A VM options file may not refer to a VM options file. "
3877 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3878 "options file '%s' in options container '%s' is an error.\n",
3879 vm_options_file_args->vm_options_file_arg(),
3880 vm_options_file_args->container_name());
3881 return JNI_EINVAL;
3882 }
3883
3884 return args_out->insert(args, vm_options_file_args->get(),
3885 vm_options_file_pos);
3886 }
3887
3888 // Expand -XX:VMOptionsFile found in args_in as needed.
3889 // mod_args and args_out parameters may return values as needed.
3890 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3891 ScopedVMInitArgs* mod_args,
3892 JavaVMInitArgs** args_out) {
3893 jint code = match_special_option_and_act(args_in, mod_args);
3894 if (code != JNI_OK) {
3895 return code;
3896 }
3897
3898 if (mod_args->is_set()) {
3899 // args_in contains -XX:VMOptionsFile and mod_args contains the
3900 // original options from args_in along with the options expanded
3901 // from the VMOptionsFile. Return a short-hand to the caller.
3902 *args_out = mod_args->get();
3903 } else {
3904 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3905 }
3906 return JNI_OK;
3907 }
3908
3909 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3910 ScopedVMInitArgs* args_out) {
3911 // Remaining part of option string
3912 const char* tail;
3913 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3914
3915 for (int index = 0; index < args->nOptions; index++) {
3916 const JavaVMOption* option = args->options + index;
3917 if (ArgumentsExt::process_options(option)) {
3918 continue;
3919 }
3920 if (match_option(option, "-XX:Flags=", &tail)) {
3921 Arguments::set_jvm_flags_file(tail);
3922 continue;
3923 }
3924 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3925 if (vm_options_file_args.found_vm_options_file_arg()) {
3926 jio_fprintf(defaultStream::error_stream(),
3927 "The option '%s' is already specified in the options "
3928 "container '%s' so the specification of '%s' in the "
3929 "same options container is an error.\n",
3930 vm_options_file_args.vm_options_file_arg(),
3931 vm_options_file_args.container_name(),
3932 option->optionString);
3933 return JNI_EINVAL;
3934 }
3935 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3936 // If there's a VMOptionsFile, parse that
3937 jint code = insert_vm_options_file(args, tail, index,
3938 &vm_options_file_args, args_out);
3939 if (code != JNI_OK) {
3940 return code;
3941 }
3942 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3943 if (args_out->is_set()) {
3944 // The VMOptions file inserted some options so switch 'args'
3945 // to the new set of options, and continue processing which
3946 // preserves "last option wins" semantics.
3947 args = args_out->get();
3948 // The first option from the VMOptionsFile replaces the
3949 // current option. So we back track to process the
3950 // replacement option.
3951 index--;
3952 }
3953 continue;
3954 }
3955 if (match_option(option, "-XX:+PrintVMOptions")) {
3956 PrintVMOptions = true;
3957 continue;
3958 }
3959 if (match_option(option, "-XX:-PrintVMOptions")) {
3960 PrintVMOptions = false;
3961 continue;
3962 }
3963 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3964 IgnoreUnrecognizedVMOptions = true;
3965 continue;
3966 }
3967 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3968 IgnoreUnrecognizedVMOptions = false;
3969 continue;
3970 }
3971 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3972 CommandLineFlags::printFlags(tty, false);
3973 vm_exit(0);
3974 }
3975 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3976 #if INCLUDE_NMT
3977 // The launcher did not setup nmt environment variable properly.
3978 if (!MemTracker::check_launcher_nmt_support(tail)) {
3979 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3980 }
3981
3982 // Verify if nmt option is valid.
3983 if (MemTracker::verify_nmt_option()) {
3984 // Late initialization, still in single-threaded mode.
3985 if (MemTracker::tracking_level() >= NMT_summary) {
3986 MemTracker::init();
3987 }
3988 } else {
3989 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3990 }
3991 continue;
3992 #else
3993 jio_fprintf(defaultStream::error_stream(),
3994 "Native Memory Tracking is not supported in this VM\n");
3995 return JNI_ERR;
3996 #endif
3997 }
3998
3999 #ifndef PRODUCT
4000 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4001 CommandLineFlags::printFlags(tty, true);
4002 vm_exit(0);
4003 }
4004 #endif
4005
4006 if (match_option(option, "-XX:+UseAppCDS")) {
4007 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4008 if (flag->is_diagnostic()) {
4009 flag->clear_diagnostic();
4010 }
4011 continue;
4012 }
4013 }
4014 return JNI_OK;
4015 }
4016
4017 static void print_options(const JavaVMInitArgs *args) {
4018 const char* tail;
4019 for (int index = 0; index < args->nOptions; index++) {
4020 const JavaVMOption *option = args->options + index;
4021 if (match_option(option, "-XX:", &tail)) {
4022 logOption(tail);
4023 }
4024 }
4025 }
4026
4027 bool Arguments::handle_deprecated_print_gc_flags() {
4028 if (PrintGC) {
4029 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4030 }
4031 if (PrintGCDetails) {
4032 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4033 }
4034
4035 if (_gc_log_filename != NULL) {
4036 // -Xloggc was used to specify a filename
4037 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4038
4039 LogTarget(Error, logging) target;
4040 LogStream errstream(target);
4041 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4042 } else if (PrintGC || PrintGCDetails) {
4043 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4044 }
4045 return true;
4046 }
4047
4048 void Arguments::handle_extra_cms_flags(const char* msg) {
4049 SpecialFlag flag;
4050 const char *flag_name = "UseConcMarkSweepGC";
4051 if (lookup_special_flag(flag_name, flag)) {
4052 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4053 warning("%s", msg);
4054 }
4055 }
4056
4057 // Parse entry point called from JNI_CreateJavaVM
4058
4059 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4060 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4061
4062 // Initialize ranges, constraints and writeables
4063 CommandLineFlagRangeList::init();
4064 CommandLineFlagConstraintList::init();
4065 CommandLineFlagWriteableList::init();
4066
4067 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4068 const char* hotspotrc = ".hotspotrc";
4069 bool settings_file_specified = false;
4070 bool needs_hotspotrc_warning = false;
4071 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4072 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4073
4074 // Pointers to current working set of containers
4075 JavaVMInitArgs* cur_cmd_args;
4076 JavaVMInitArgs* cur_java_options_args;
4077 JavaVMInitArgs* cur_java_tool_options_args;
4078
4079 // Containers for modified/expanded options
4080 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4081 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4082 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4083
4084
4085 jint code =
4086 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4087 if (code != JNI_OK) {
4088 return code;
4089 }
4090
4091 code = parse_java_options_environment_variable(&initial_java_options_args);
4092 if (code != JNI_OK) {
4093 return code;
4094 }
4095
4096 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4097 &mod_java_tool_options_args,
4098 &cur_java_tool_options_args);
4099 if (code != JNI_OK) {
4100 return code;
4101 }
4102
4103 code = expand_vm_options_as_needed(initial_cmd_args,
4104 &mod_cmd_args,
4105 &cur_cmd_args);
4106 if (code != JNI_OK) {
4107 return code;
4108 }
4109
4110 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4111 &mod_java_options_args,
4112 &cur_java_options_args);
4113 if (code != JNI_OK) {
4114 return code;
4115 }
4116
4117 const char* flags_file = Arguments::get_jvm_flags_file();
4118 settings_file_specified = (flags_file != NULL);
4119
4120 if (IgnoreUnrecognizedVMOptions) {
4121 cur_cmd_args->ignoreUnrecognized = true;
4122 cur_java_tool_options_args->ignoreUnrecognized = true;
4123 cur_java_options_args->ignoreUnrecognized = true;
4124 }
4125
4126 // Parse specified settings file
4127 if (settings_file_specified) {
4128 if (!process_settings_file(flags_file, true,
4129 cur_cmd_args->ignoreUnrecognized)) {
4130 return JNI_EINVAL;
4131 }
4132 } else {
4133 #ifdef ASSERT
4134 // Parse default .hotspotrc settings file
4135 if (!process_settings_file(".hotspotrc", false,
4136 cur_cmd_args->ignoreUnrecognized)) {
4137 return JNI_EINVAL;
4138 }
4139 #else
4140 struct stat buf;
4141 if (os::stat(hotspotrc, &buf) == 0) {
4142 needs_hotspotrc_warning = true;
4143 }
4144 #endif
4145 }
4146
4147 if (PrintVMOptions) {
4148 print_options(cur_java_tool_options_args);
4149 print_options(cur_cmd_args);
4150 print_options(cur_java_options_args);
4151 }
4152
4153 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4154 jint result = parse_vm_init_args(cur_java_tool_options_args,
4155 cur_java_options_args,
4156 cur_cmd_args);
4157
4158 if (result != JNI_OK) {
4159 return result;
4160 }
4161
4162 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4163 SharedArchivePath = get_shared_archive_path();
4164 if (SharedArchivePath == NULL) {
4165 return JNI_ENOMEM;
4166 }
4167
4168 // Set up VerifySharedSpaces
4169 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4170 VerifySharedSpaces = true;
4171 }
4172
4173 // Delay warning until here so that we've had a chance to process
4174 // the -XX:-PrintWarnings flag
4175 if (needs_hotspotrc_warning) {
4176 warning("%s file is present but has been ignored. "
4177 "Run with -XX:Flags=%s to load the file.",
4178 hotspotrc, hotspotrc);
4179 }
4180
4181 if (needs_module_property_warning) {
4182 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4183 " names that are reserved for internal use.");
4184 }
4185
4186 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4187 UNSUPPORTED_OPTION(UseLargePages);
4188 #endif
4189
4190 ArgumentsExt::report_unsupported_options();
4191
4192 #ifndef PRODUCT
4193 if (TraceBytecodesAt != 0) {
4194 TraceBytecodes = true;
4195 }
4196 if (CountCompiledCalls) {
4197 if (UseCounterDecay) {
4198 warning("UseCounterDecay disabled because CountCalls is set");
4199 UseCounterDecay = false;
4200 }
4201 }
4202 #endif // PRODUCT
4203
4204 if (ScavengeRootsInCode == 0) {
4205 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4206 warning("Forcing ScavengeRootsInCode non-zero");
4207 }
4208 ScavengeRootsInCode = 1;
4209 }
4210
4211 if (!handle_deprecated_print_gc_flags()) {
4212 return JNI_EINVAL;
4213 }
4214
4215 // Set object alignment values.
4216 set_object_alignment();
4217
4218 #if !INCLUDE_CDS
4219 if (DumpSharedSpaces || RequireSharedSpaces) {
4220 jio_fprintf(defaultStream::error_stream(),
4221 "Shared spaces are not supported in this VM\n");
4222 return JNI_ERR;
4223 }
4224 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4225 log_is_enabled(Info, cds)) {
4226 warning("Shared spaces are not supported in this VM");
4227 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4228 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4229 }
4230 no_shared_spaces("CDS Disabled");
4231 #endif // INCLUDE_CDS
4232
4233 return JNI_OK;
4234 }
4235
4236 jint Arguments::apply_ergo() {
4237 // Set flags based on ergonomics.
4238 jint result = set_ergonomics_flags();
4239 if (result != JNI_OK) return result;
4240
4241 #if INCLUDE_JVMCI
4242 set_jvmci_specific_flags();
4243 #endif
4244
4245 set_shared_spaces_flags();
4246
4247 // Check the GC selections again.
4248 if (!check_gc_consistency()) {
4249 return JNI_EINVAL;
4250 }
4251
4252 if (TieredCompilation) {
4253 set_tiered_flags();
4254 } else {
4255 int max_compilation_policy_choice = 1;
4256 #ifdef COMPILER2
4257 if (is_server_compilation_mode_vm()) {
4258 max_compilation_policy_choice = 2;
4259 }
4260 #endif
4261 // Check if the policy is valid.
4262 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4263 vm_exit_during_initialization(
4264 "Incompatible compilation policy selected", NULL);
4265 }
4266 // Scale CompileThreshold
4267 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4268 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4269 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4270 }
4271 }
4272
4273 #ifdef COMPILER2
4274 #ifndef PRODUCT
4275 if (PrintIdealGraphLevel > 0) {
4276 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4277 }
4278 #endif
4279 #endif
4280
4281 // Set heap size based on available physical memory
4282 set_heap_size();
4283
4284 GCArguments::arguments()->initialize_flags();
4285
4286 // Initialize Metaspace flags and alignments
4287 Metaspace::ergo_initialize();
4288
4289 // Set bytecode rewriting flags
4290 set_bytecode_flags();
4291
4292 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4293 jint code = set_aggressive_opts_flags();
4294 if (code != JNI_OK) {
4295 return code;
4296 }
4297
4298 // Turn off biased locking for locking debug mode flags,
4299 // which are subtly different from each other but neither works with
4300 // biased locking
4301 if (UseHeavyMonitors
4302 #ifdef COMPILER1
4303 || !UseFastLocking
4304 #endif // COMPILER1
4305 #if INCLUDE_JVMCI
4306 || !JVMCIUseFastLocking
4307 #endif
4308 ) {
4309 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4310 // flag set to true on command line; warn the user that they
4311 // can't enable biased locking here
4312 warning("Biased Locking is not supported with locking debug flags"
4313 "; ignoring UseBiasedLocking flag." );
4314 }
4315 UseBiasedLocking = false;
4316 }
4317
4318 #ifdef CC_INTERP
4319 // Clear flags not supported on zero.
4320 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4321 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4322 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4323 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4324 #endif // CC_INTERP
4325
4326 #ifdef COMPILER2
4327 if (!EliminateLocks) {
4328 EliminateNestedLocks = false;
4329 }
4330 if (!Inline) {
4331 IncrementalInline = false;
4332 }
4333 #ifndef PRODUCT
4334 if (!IncrementalInline) {
4335 AlwaysIncrementalInline = false;
4336 }
4337 #endif
4338 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4339 // nothing to use the profiling, turn if off
4340 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4341 }
4342 #endif
4343
4344 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4345 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4346 DebugNonSafepoints = true;
4347 }
4348
4349 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4350 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4351 }
4352
4353 if (UseOnStackReplacement && !UseLoopCounter) {
4354 warning("On-stack-replacement requires loop counters; enabling loop counters");
4355 FLAG_SET_DEFAULT(UseLoopCounter, true);
4356 }
4357
4358 #ifndef PRODUCT
4359 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4360 if (use_vm_log()) {
4361 LogVMOutput = true;
4362 }
4363 }
4364 #endif // PRODUCT
4365
4366 if (PrintCommandLineFlags) {
4367 CommandLineFlags::printSetFlags(tty);
4368 }
4369
4370 // Apply CPU specific policy for the BiasedLocking
4371 if (UseBiasedLocking) {
4372 if (!VM_Version::use_biased_locking() &&
4373 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4374 UseBiasedLocking = false;
4375 }
4376 }
4377 #ifdef COMPILER2
4378 if (!UseBiasedLocking || EmitSync != 0) {
4379 UseOptoBiasInlining = false;
4380 }
4381 #endif
4382
4383 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4384 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4385 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4386 } else {
4387 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4388 }
4389
4390 return JNI_OK;
4391 }
4392
4393 jint Arguments::adjust_after_os() {
4394 if (UseNUMA) {
4395 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4396 FLAG_SET_ERGO(bool, UseNUMA, false);
4397 } else if (UseParallelGC || UseParallelOldGC) {
4398 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4399 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4400 }
4401 }
4402 // UseNUMAInterleaving is set to ON for all collectors and
4403 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4404 // such as the parallel collector for Linux and Solaris will
4405 // interleave old gen and survivor spaces on top of NUMA
4406 // allocation policy for the eden space.
4407 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4408 // all platforms and ParallelGC on Windows will interleave all
4409 // of the heap spaces across NUMA nodes.
4410 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4411 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4412 }
4413 }
4414 return JNI_OK;
4415 }
4416
4417 int Arguments::PropertyList_count(SystemProperty* pl) {
4418 int count = 0;
4419 while(pl != NULL) {
4420 count++;
4421 pl = pl->next();
4422 }
4423 return count;
4424 }
4425
4426 // Return the number of readable properties.
4427 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4428 int count = 0;
4429 while(pl != NULL) {
4430 if (pl->is_readable()) {
4431 count++;
4432 }
4433 pl = pl->next();
4434 }
4435 return count;
4436 }
4437
4438 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4439 assert(key != NULL, "just checking");
4440 SystemProperty* prop;
4441 for (prop = pl; prop != NULL; prop = prop->next()) {
4442 if (strcmp(key, prop->key()) == 0) return prop->value();
4443 }
4444 return NULL;
4445 }
4446
4447 // Return the value of the requested property provided that it is a readable property.
4448 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4449 assert(key != NULL, "just checking");
4450 SystemProperty* prop;
4451 // Return the property value if the keys match and the property is not internal or
4452 // it's the special internal property "jdk.boot.class.path.append".
4453 for (prop = pl; prop != NULL; prop = prop->next()) {
4454 if (strcmp(key, prop->key()) == 0) {
4455 if (!prop->internal()) {
4456 return prop->value();
4457 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4458 return prop->value();
4459 } else {
4460 // Property is internal and not jdk.boot.class.path.append so return NULL.
4461 return NULL;
4462 }
4463 }
4464 }
4465 return NULL;
4466 }
4467
4468 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4469 int count = 0;
4470 const char* ret_val = NULL;
4471
4472 while(pl != NULL) {
4473 if(count >= index) {
4474 ret_val = pl->key();
4475 break;
4476 }
4477 count++;
4478 pl = pl->next();
4479 }
4480
4481 return ret_val;
4482 }
4483
4484 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4485 int count = 0;
4486 char* ret_val = NULL;
4487
4488 while(pl != NULL) {
4489 if(count >= index) {
4490 ret_val = pl->value();
4491 break;
4492 }
4493 count++;
4494 pl = pl->next();
4495 }
4496
4497 return ret_val;
4498 }
4499
4500 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4501 SystemProperty* p = *plist;
4502 if (p == NULL) {
4503 *plist = new_p;
4504 } else {
4505 while (p->next() != NULL) {
4506 p = p->next();
4507 }
4508 p->set_next(new_p);
4509 }
4510 }
4511
4512 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4513 bool writeable, bool internal) {
4514 if (plist == NULL)
4515 return;
4516
4517 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4518 PropertyList_add(plist, new_p);
4519 }
4520
4521 void Arguments::PropertyList_add(SystemProperty *element) {
4522 PropertyList_add(&_system_properties, element);
4523 }
4524
4525 // This add maintains unique property key in the list.
4526 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4527 PropertyAppendable append, PropertyWriteable writeable,
4528 PropertyInternal internal) {
4529 if (plist == NULL)
4530 return;
4531
4532 // If property key exist then update with new value.
4533 SystemProperty* prop;
4534 for (prop = *plist; prop != NULL; prop = prop->next()) {
4535 if (strcmp(k, prop->key()) == 0) {
4536 if (append == AppendProperty) {
4537 prop->append_value(v);
4538 } else {
4539 prop->set_value(v);
4540 }
4541 return;
4542 }
4543 }
4544
4545 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4546 }
4547
4548 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4549 // Returns true if all of the source pointed by src has been copied over to
4550 // the destination buffer pointed by buf. Otherwise, returns false.
4551 // Notes:
4552 // 1. If the length (buflen) of the destination buffer excluding the
4553 // NULL terminator character is not long enough for holding the expanded
4554 // pid characters, it also returns false instead of returning the partially
4555 // expanded one.
4556 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4557 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4558 char* buf, size_t buflen) {
4559 const char* p = src;
4560 char* b = buf;
4561 const char* src_end = &src[srclen];
4562 char* buf_end = &buf[buflen - 1];
4563
4564 while (p < src_end && b < buf_end) {
4565 if (*p == '%') {
4566 switch (*(++p)) {
4567 case '%': // "%%" ==> "%"
4568 *b++ = *p++;
4569 break;
4570 case 'p': { // "%p" ==> current process id
4571 // buf_end points to the character before the last character so
4572 // that we could write '\0' to the end of the buffer.
4573 size_t buf_sz = buf_end - b + 1;
4574 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4575
4576 // if jio_snprintf fails or the buffer is not long enough to hold
4577 // the expanded pid, returns false.
4578 if (ret < 0 || ret >= (int)buf_sz) {
4579 return false;
4580 } else {
4581 b += ret;
4582 assert(*b == '\0', "fail in copy_expand_pid");
4583 if (p == src_end && b == buf_end + 1) {
4584 // reach the end of the buffer.
4585 return true;
4586 }
4587 }
4588 p++;
4589 break;
4590 }
4591 default :
4592 *b++ = '%';
4593 }
4594 } else {
4595 *b++ = *p++;
4596 }
4597 }
4598 *b = '\0';
4599 return (p == src_end); // return false if not all of the source was copied
4600 }