1 /*
2 * Copyright (c) 1997, 2017, 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.inline.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/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 char* Arguments::_jvm_flags_file = NULL;
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 size_t Arguments::_conservative_max_heap_alignment = 0;
78 size_t Arguments::_min_heap_size = 0;
79 Arguments::Mode Arguments::_mode = _mixed;
80 bool Arguments::_java_compiler = false;
81 bool Arguments::_xdebug_mode = false;
82 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
83 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
84 int Arguments::_sun_java_launcher_pid = -1;
85 bool Arguments::_sun_java_launcher_is_altjvm = false;
86
87 // These parameters are reset in method parse_vm_init_args()
88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
90 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
91 bool Arguments::_ClipInlining = ClipInlining;
92 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
93 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
94
95 char* Arguments::SharedArchivePath = NULL;
96
97 AgentLibraryList Arguments::_libraryList;
98 AgentLibraryList Arguments::_agentList;
99
100 abort_hook_t Arguments::_abort_hook = NULL;
101 exit_hook_t Arguments::_exit_hook = NULL;
102 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
103
104
105 SystemProperty *Arguments::_sun_boot_library_path = NULL;
106 SystemProperty *Arguments::_java_library_path = NULL;
107 SystemProperty *Arguments::_java_home = NULL;
108 SystemProperty *Arguments::_java_class_path = NULL;
109 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
110
111 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
112 PathString *Arguments::_system_boot_class_path = NULL;
113 bool Arguments::_has_jimage = false;
114
115 char* Arguments::_ext_dirs = NULL;
116
117 bool PathString::set_value(const char *value) {
118 if (_value != NULL) {
119 FreeHeap(_value);
120 }
121 _value = AllocateHeap(strlen(value)+1, mtArguments);
122 assert(_value != NULL, "Unable to allocate space for new path value");
123 if (_value != NULL) {
124 strcpy(_value, value);
125 } else {
126 // not able to allocate
127 return false;
128 }
129 return true;
130 }
131
132 void PathString::append_value(const char *value) {
133 char *sp;
134 size_t len = 0;
135 if (value != NULL) {
136 len = strlen(value);
137 if (_value != NULL) {
138 len += strlen(_value);
139 }
140 sp = AllocateHeap(len+2, mtArguments);
141 assert(sp != NULL, "Unable to allocate space for new append path value");
142 if (sp != NULL) {
143 if (_value != NULL) {
144 strcpy(sp, _value);
145 strcat(sp, os::path_separator());
146 strcat(sp, value);
147 FreeHeap(_value);
148 } else {
149 strcpy(sp, value);
150 }
151 _value = sp;
152 }
153 }
154 }
155
156 PathString::PathString(const char* value) {
157 if (value == NULL) {
158 _value = NULL;
159 } else {
160 _value = AllocateHeap(strlen(value)+1, mtArguments);
161 strcpy(_value, value);
162 }
163 }
164
165 PathString::~PathString() {
166 if (_value != NULL) {
167 FreeHeap(_value);
168 _value = NULL;
169 }
170 }
171
172 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
173 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
174 size_t len = strlen(module_name) + 1;
175 _module_name = AllocateHeap(len, mtInternal);
176 strncpy(_module_name, module_name, len); // copy the trailing null
177 _path = new PathString(path);
178 }
179
180 ModulePatchPath::~ModulePatchPath() {
181 if (_module_name != NULL) {
182 FreeHeap(_module_name);
183 _module_name = NULL;
184 }
185 if (_path != NULL) {
186 delete _path;
187 _path = NULL;
188 }
189 }
190
191 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
192 if (key == NULL) {
193 _key = NULL;
194 } else {
195 _key = AllocateHeap(strlen(key)+1, mtArguments);
196 strcpy(_key, key);
197 }
198 _next = NULL;
199 _internal = internal;
200 _writeable = writeable;
201 }
202
203 AgentLibrary::AgentLibrary(const char* name, const char* options, bool is_absolute_path, void* os_lib) {
204 _name = AllocateHeap(strlen(name)+1, mtArguments);
205 strcpy(_name, name);
206 if (options == NULL) {
207 _options = NULL;
208 } else {
209 _options = AllocateHeap(strlen(options)+1, mtArguments);
210 strcpy(_options, options);
211 }
212 _is_absolute_path = is_absolute_path;
213 _os_lib = os_lib;
214 _next = NULL;
215 _state = agent_invalid;
216 _is_static_lib = false;
217 }
218
219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220 // part of the option string.
221 static bool match_option(const JavaVMOption *option, const char* name,
222 const char** tail) {
223 size_t len = strlen(name);
224 if (strncmp(option->optionString, name, len) == 0) {
225 *tail = option->optionString + len;
226 return true;
227 } else {
228 return false;
229 }
230 }
231
232 // Check if 'option' matches 'name'. No "tail" is allowed.
233 static bool match_option(const JavaVMOption *option, const char* name) {
234 const char* tail = NULL;
235 bool result = match_option(option, name, &tail);
236 if (tail != NULL && *tail == '\0') {
237 return result;
238 } else {
239 return false;
240 }
241 }
242
243 // Return true if any of the strings in null-terminated array 'names' matches.
244 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
245 // the option must match exactly.
246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
247 bool tail_allowed) {
248 for (/* empty */; *names != NULL; ++names) {
249 if (match_option(option, *names, tail)) {
250 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
251 return true;
252 }
253 }
254 }
255 return false;
256 }
257
258 static void logOption(const char* opt) {
259 if (PrintVMOptions) {
260 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
261 }
262 }
263
264 bool needs_module_property_warning = false;
265
266 #define MODULE_PROPERTY_PREFIX "jdk.module."
267 #define MODULE_PROPERTY_PREFIX_LEN 11
268 #define ADDEXPORTS "addexports"
269 #define ADDEXPORTS_LEN 10
270 #define ADDREADS "addreads"
271 #define ADDREADS_LEN 8
272 #define ADDOPENS "addopens"
273 #define ADDOPENS_LEN 8
274 #define PATCH "patch"
275 #define PATCH_LEN 5
276 #define ADDMODS "addmods"
277 #define ADDMODS_LEN 7
278 #define LIMITMODS "limitmods"
279 #define LIMITMODS_LEN 9
280 #define PATH "path"
281 #define PATH_LEN 4
282 #define UPGRADE_PATH "upgrade.path"
283 #define UPGRADE_PATH_LEN 12
284
285 void Arguments::add_init_library(const char* name, char* options) {
286 _libraryList.add(new AgentLibrary(name, options, false, NULL));
287 }
288
289 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
290 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
291 }
292
293 // Late-binding agents not started via arguments
294 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
295 _agentList.add(agentLib);
296 }
297
298 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
299 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
300 }
301
302 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
303 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
304 return ((strncmp(option, property, len) == 0) &&
305 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
306 }
307
308 // Return true if property starts with "jdk.module." and its ensuing chars match
309 // any of the reserved module properties.
310 // property should be passed without the leading "-D".
311 bool Arguments::is_internal_module_property(const char* property) {
312 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
313 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
314 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
315 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
316 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
317 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
318 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
319 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
320 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
321 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
322 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
323 return true;
324 }
325 }
326 return false;
327 }
328
329 // Process java launcher properties.
330 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
331 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
332 // sun.java.launcher.pid is defined.
333 // Must do this before setting up other system properties,
334 // as some of them may depend on launcher type.
335 for (int index = 0; index < args->nOptions; index++) {
336 const JavaVMOption* option = args->options + index;
337 const char* tail;
338
339 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
340 process_java_launcher_argument(tail, option->extraInfo);
341 continue;
342 }
343 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
344 if (strcmp(tail, "true") == 0) {
345 _sun_java_launcher_is_altjvm = true;
346 }
347 continue;
348 }
349 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
350 _sun_java_launcher_pid = atoi(tail);
351 continue;
352 }
353 }
354 }
355
356 // Initialize system properties key and value.
357 void Arguments::init_system_properties() {
358
359 // Set up _system_boot_class_path which is not a property but
360 // relies heavily on argument processing and the jdk.boot.class.path.append
361 // property. It is used to store the underlying system boot class path.
362 _system_boot_class_path = new PathString(NULL);
363
364 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
365 "Java Virtual Machine Specification", false));
366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
367 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
369 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
370
371 // Following are JVMTI agent writable properties.
372 // Properties values are set to NULL and they are
373 // os specific they are initialized in os::init_system_properties_values().
374 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
375 _java_library_path = new SystemProperty("java.library.path", NULL, true);
376 _java_home = new SystemProperty("java.home", NULL, true);
377 _java_class_path = new SystemProperty("java.class.path", "", true);
378 // jdk.boot.class.path.append is a non-writeable, internal property.
379 // It can only be set by either:
380 // - -Xbootclasspath/a:
381 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
382 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
383
384 // Add to System Property list.
385 PropertyList_add(&_system_properties, _sun_boot_library_path);
386 PropertyList_add(&_system_properties, _java_library_path);
387 PropertyList_add(&_system_properties, _java_home);
388 PropertyList_add(&_system_properties, _java_class_path);
389 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
390
391 // Set OS specific system properties values
392 os::init_system_properties_values();
393 }
394
395 // Update/Initialize System properties after JDK version number is known
396 void Arguments::init_version_specific_system_properties() {
397 enum { bufsz = 16 };
398 char buffer[bufsz];
399 const char* spec_vendor = "Oracle Corporation";
400 uint32_t spec_version = JDK_Version::current().major_version();
401
402 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
403
404 PropertyList_add(&_system_properties,
405 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
406 PropertyList_add(&_system_properties,
407 new SystemProperty("java.vm.specification.version", buffer, false));
408 PropertyList_add(&_system_properties,
409 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
410 }
411
412 /*
413 * -XX argument processing:
414 *
415 * -XX arguments are defined in several places, such as:
416 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
417 * -XX arguments are parsed in parse_argument().
418 * -XX argument bounds checking is done in check_vm_args_consistency().
419 *
420 * Over time -XX arguments may change. There are mechanisms to handle common cases:
421 *
422 * ALIASED: An option that is simply another name for another option. This is often
423 * part of the process of deprecating a flag, but not all aliases need
424 * to be deprecated.
425 *
426 * Create an alias for an option by adding the old and new option names to the
427 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
428 *
429 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
430 * support may be removed in the future. Both regular and aliased options may be
431 * deprecated.
432 *
433 * Add a deprecation warning for an option (or alias) by adding an entry in the
434 * "special_jvm_flags" table and setting the "deprecated_in" field.
435 * Often an option "deprecated" in one major release will
436 * be made "obsolete" in the next. In this case the entry should also have its
437 * "obsolete_in" field set.
438 *
439 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
440 * on the command line. A warning is printed to let the user know that option might not
441 * be accepted in the future.
442 *
443 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
444 * table and setting the "obsolete_in" field.
445 *
446 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
447 * to the current JDK version. The system will flatly refuse to admit the existence of
448 * the flag. This allows a flag to die automatically over JDK releases.
449 *
450 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
451 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
452 * - Newly obsolete or expired deprecated options should have their global variable
453 * definitions removed (from globals.hpp, etc) and related implementations removed.
454 *
455 * Recommended approach for removing options:
456 *
457 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
458 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
459 *
460 * To remove internal options (e.g. diagnostic, experimental, develop options), use
461 * a 2-step model adding major release numbers to the obsolete and expire columns.
462 *
463 * To change the name of an option, use the alias table as well as a 2-step
464 * model adding major release numbers to the deprecate and expire columns.
465 * Think twice about aliasing commonly used customer options.
466 *
467 * There are times when it is appropriate to leave a future release number as undefined.
468 *
469 * Tests: Aliases should be tested in VMAliasOptions.java.
470 * Deprecated options should be tested in VMDeprecatedOptions.java.
471 */
472
473 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
474 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
475 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
476 // the command-line as usual, but will issue a warning.
477 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
478 // the command-line, while issuing a warning and ignoring the flag value.
479 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
480 // existence of the flag.
481 //
482 // MANUAL CLEANUP ON JDK VERSION UPDATES:
483 // This table ensures that the handling of options will update automatically when the JDK
484 // version is incremented, but the source code needs to be cleanup up manually:
485 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
486 // variable should be removed, as well as users of the variable.
487 // - As "deprecated" options age into "obsolete" options, move the entry into the
488 // "Obsolete Flags" section of the table.
489 // - All expired options should be removed from the table.
490 static SpecialFlag const special_jvm_flags[] = {
491 // -------------- Deprecated Flags --------------
492 // --- Non-alias flags - sorted by obsolete_in then expired_in:
493 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
494 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
495 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
496 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
497 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
498 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
501 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
502 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
503 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
504 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
505 { "UseCGroupMemoryLimitForHeap", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::jdk(11) },
506 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
507 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
508
509 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
510 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
511 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
512 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
514
515 // -------------- Obsolete Flags - sorted by expired_in --------------
516 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
517 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
518 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
519 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
520 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
521 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
522 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
523 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
524 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
525
526 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
527 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
528 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
529 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
530 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
531 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
534 #endif
535
536 { NULL, JDK_Version(0), JDK_Version(0) }
537 };
538
539 // Flags that are aliases for other flags.
540 typedef struct {
541 const char* alias_name;
542 const char* real_name;
543 } AliasedFlag;
544
545 static AliasedFlag const aliased_jvm_flags[] = {
546 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
547 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
548 { NULL, NULL}
549 };
550
551 // NOTE: A compatibility request will be necessary for each alias to be removed.
552 static AliasedLoggingFlag const aliased_logging_flags[] = {
553 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
554 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
555 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
556 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
557 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
558 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
559 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
560 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
561 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
562 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
563 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
564 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
565 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
566 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
567 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
568 };
569
570 #ifndef PRODUCT
571 // These options are removed in jdk9. Remove this code for jdk10.
572 static AliasedFlag const removed_develop_logging_flags[] = {
573 { "TraceClassInitialization", "-Xlog:class+init" },
574 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
575 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
576 { "TraceItables", "-Xlog:itables=debug" },
577 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
578 { "TraceSafepoint", "-Xlog:safepoint=debug" },
579 { "TraceStartupTime", "-Xlog:startuptime" },
580 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
581 { "PrintVtables", "-Xlog:vtables=debug" },
582 { "VerboseVerification", "-Xlog:verification" },
583 { NULL, NULL }
584 };
585 #endif //PRODUCT
586
587 // Return true if "v" is less than "other", where "other" may be "undefined".
588 static bool version_less_than(JDK_Version v, JDK_Version other) {
589 assert(!v.is_undefined(), "must be defined");
590 if (!other.is_undefined() && v.compare(other) >= 0) {
591 return false;
592 } else {
593 return true;
594 }
595 }
596
597 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
598
599 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
600 // Allow extensions to have priority
601 if (lookup_special_flag_ext(flag_name, flag)) {
602 return true;
603 }
604
605 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
606 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
607 flag = special_jvm_flags[i];
608 return true;
609 }
610 }
611 return false;
612 }
613
614 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
615 assert(version != NULL, "Must provide a version buffer");
616 SpecialFlag flag;
617 if (lookup_special_flag(flag_name, flag)) {
618 if (!flag.obsolete_in.is_undefined()) {
619 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
620 *version = flag.obsolete_in;
621 return true;
622 }
623 }
624 }
625 return false;
626 }
627
628 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
629 assert(version != NULL, "Must provide a version buffer");
630 SpecialFlag flag;
631 if (lookup_special_flag(flag_name, flag)) {
632 if (!flag.deprecated_in.is_undefined()) {
633 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
634 version_less_than(JDK_Version::current(), flag.expired_in)) {
635 *version = flag.deprecated_in;
636 return 1;
637 } else {
638 return -1;
639 }
640 }
641 }
642 return 0;
643 }
644
645 #ifndef PRODUCT
646 const char* Arguments::removed_develop_logging_flag_name(const char* name){
647 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
648 const AliasedFlag& flag = removed_develop_logging_flags[i];
649 if (strcmp(flag.alias_name, name) == 0) {
650 return flag.real_name;
651 }
652 }
653 return NULL;
654 }
655 #endif // PRODUCT
656
657 const char* Arguments::real_flag_name(const char *flag_name) {
658 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
659 const AliasedFlag& flag_status = aliased_jvm_flags[i];
660 if (strcmp(flag_status.alias_name, flag_name) == 0) {
661 return flag_status.real_name;
662 }
663 }
664 return flag_name;
665 }
666
667 #ifdef ASSERT
668 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
669 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
670 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
671 return true;
672 }
673 }
674 return false;
675 }
676
677 static bool verify_special_jvm_flags() {
678 bool success = true;
679 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
680 const SpecialFlag& flag = special_jvm_flags[i];
681 if (lookup_special_flag(flag.name, i)) {
682 warning("Duplicate special flag declaration \"%s\"", flag.name);
683 success = false;
684 }
685 if (flag.deprecated_in.is_undefined() &&
686 flag.obsolete_in.is_undefined()) {
687 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
688 success = false;
689 }
690
691 if (!flag.deprecated_in.is_undefined()) {
692 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
693 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
694 success = false;
695 }
696
697 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
698 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
699 success = false;
700 }
701 }
702
703 if (!flag.obsolete_in.is_undefined()) {
704 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
705 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
706 success = false;
707 }
708
709 // if flag has become obsolete it should not have a "globals" flag defined anymore.
710 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
711 if (Flag::find_flag(flag.name) != NULL) {
712 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
713 }
714 }
715 }
716
717 if (!flag.expired_in.is_undefined()) {
718 // if flag has become expired it should not have a "globals" flag defined anymore.
719 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
720 if (Flag::find_flag(flag.name) != NULL) {
721 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
722 }
723 }
724 }
725
726 }
727 return success;
728 }
729 #endif
730
731 // Parses a size specification string.
732 bool Arguments::atojulong(const char *s, julong* result) {
733 julong n = 0;
734
735 // First char must be a digit. Don't allow negative numbers or leading spaces.
736 if (!isdigit(*s)) {
737 return false;
738 }
739
740 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
741 char* remainder;
742 errno = 0;
743 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
744 if (errno != 0) {
745 return false;
746 }
747
748 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
749 if (remainder == s || strlen(remainder) > 1) {
750 return false;
751 }
752
753 switch (*remainder) {
754 case 'T': case 't':
755 *result = n * G * K;
756 // Check for overflow.
757 if (*result/((julong)G * K) != n) return false;
758 return true;
759 case 'G': case 'g':
760 *result = n * G;
761 if (*result/G != n) return false;
762 return true;
763 case 'M': case 'm':
764 *result = n * M;
765 if (*result/M != n) return false;
766 return true;
767 case 'K': case 'k':
768 *result = n * K;
769 if (*result/K != n) return false;
770 return true;
771 case '\0':
772 *result = n;
773 return true;
774 default:
775 return false;
776 }
777 }
778
779 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
780 if (size < min_size) return arg_too_small;
781 if (size > max_size) return arg_too_big;
782 return arg_in_range;
783 }
784
785 // Describe an argument out of range error
786 void Arguments::describe_range_error(ArgsRange errcode) {
787 switch(errcode) {
788 case arg_too_big:
789 jio_fprintf(defaultStream::error_stream(),
790 "The specified size exceeds the maximum "
791 "representable size.\n");
792 break;
793 case arg_too_small:
794 case arg_unreadable:
795 case arg_in_range:
796 // do nothing for now
797 break;
798 default:
799 ShouldNotReachHere();
800 }
801 }
802
803 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
804 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
805 return true;
806 } else {
807 return false;
808 }
809 }
810
811 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
812 char* end;
813 errno = 0;
814 double v = strtod(value, &end);
815 if ((errno != 0) || (*end != 0)) {
816 return false;
817 }
818
819 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
820 return true;
821 }
822 return false;
823 }
824
825 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
826 julong v;
827 int int_v;
828 intx intx_v;
829 bool is_neg = false;
830 Flag* result = Flag::find_flag(name, strlen(name));
831
832 if (result == NULL) {
833 return false;
834 }
835
836 // Check the sign first since atojulong() parses only unsigned values.
837 if (*value == '-') {
838 if (!result->is_intx() && !result->is_int()) {
839 return false;
840 }
841 value++;
842 is_neg = true;
843 }
844 if (!Arguments::atojulong(value, &v)) {
845 return false;
846 }
847 if (result->is_int()) {
848 int_v = (int) v;
849 if (is_neg) {
850 int_v = -int_v;
851 }
852 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
853 } else if (result->is_uint()) {
854 uint uint_v = (uint) v;
855 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
856 } else if (result->is_intx()) {
857 intx_v = (intx) v;
858 if (is_neg) {
859 intx_v = -intx_v;
860 }
861 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
862 } else if (result->is_uintx()) {
863 uintx uintx_v = (uintx) v;
864 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
865 } else if (result->is_uint64_t()) {
866 uint64_t uint64_t_v = (uint64_t) v;
867 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
868 } else if (result->is_size_t()) {
869 size_t size_t_v = (size_t) v;
870 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
871 } else if (result->is_double()) {
872 double double_v = (double) v;
873 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
874 } else {
875 return false;
876 }
877 }
878
879 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
880 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
881 // Contract: CommandLineFlags always returns a pointer that needs freeing.
882 FREE_C_HEAP_ARRAY(char, value);
883 return true;
884 }
885
886 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
887 const char* old_value = "";
888 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
889 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
890 size_t new_len = strlen(new_value);
891 const char* value;
892 char* free_this_too = NULL;
893 if (old_len == 0) {
894 value = new_value;
895 } else if (new_len == 0) {
896 value = old_value;
897 } else {
898 size_t length = old_len + 1 + new_len + 1;
899 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
900 // each new setting adds another LINE to the switch:
901 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
902 value = buf;
903 free_this_too = buf;
904 }
905 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
906 // CommandLineFlags always returns a pointer that needs freeing.
907 FREE_C_HEAP_ARRAY(char, value);
908 if (free_this_too != NULL) {
909 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
910 FREE_C_HEAP_ARRAY(char, free_this_too);
911 }
912 return true;
913 }
914
915 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
916 const char* real_name = real_flag_name(arg);
917 JDK_Version since = JDK_Version();
918 switch (is_deprecated_flag(arg, &since)) {
919 case -1:
920 return NULL; // obsolete or expired, don't process normally
921 case 0:
922 return real_name;
923 case 1: {
924 if (warn) {
925 char version[256];
926 since.to_string(version, sizeof(version));
927 if (real_name != arg) {
928 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
929 arg, version, real_name);
930 } else {
931 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
932 arg, version);
933 }
934 }
935 return real_name;
936 }
937 }
938 ShouldNotReachHere();
939 return NULL;
940 }
941
942 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
943 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
944 // Set tagset string buffer at max size of 256, large enough for any alias tagset
945 const int max_tagset_size = 256;
946 int max_tagset_len = max_tagset_size - 1;
947 char tagset_buffer[max_tagset_size];
948 tagset_buffer[0] = '\0';
949
950 // Write tag-set for aliased logging option, in string list form
951 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
952 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
953 if (i > 0) {
954 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
955 }
956 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
957 }
958 if (!alf.exactMatch) {
959 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
960 }
961 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
962 (on) ? "+" : "-",
963 name,
964 tagset_buffer,
965 (on) ? LogLevel::name(alf.level) : "off");
966 }
967
968 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
969 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
970 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
971 if (strcmp(alf.alias_name, name) == 0) {
972 log_deprecated_flag(name, on, alf);
973 return alf;
974 }
975 }
976 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
977 return a;
978 }
979
980 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
981
982 // range of acceptable characters spelled out for portability reasons
983 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
984 #define BUFLEN 255
985 char name[BUFLEN+1];
986 char dummy;
987 const char* real_name;
988 bool warn_if_deprecated = true;
989
990 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
991 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
992 if (alf.alias_name != NULL){
993 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
994 return true;
995 }
996 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
997 if (real_name == NULL) {
998 return false;
999 }
1000 return set_bool_flag(real_name, false, origin);
1001 }
1002 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1003 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1004 if (alf.alias_name != NULL){
1005 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1006 return true;
1007 }
1008 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1009 if (real_name == NULL) {
1010 return false;
1011 }
1012 return set_bool_flag(real_name, true, origin);
1013 }
1014
1015 char punct;
1016 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1017 const char* value = strchr(arg, '=') + 1;
1018 Flag* flag;
1019
1020 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1021 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1022 if (alf.alias_name != NULL) {
1023 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1024 return true;
1025 }
1026 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1027 if (real_name == NULL) {
1028 return false;
1029 }
1030 flag = Flag::find_flag(real_name);
1031 if (flag != NULL && flag->is_ccstr()) {
1032 if (flag->ccstr_accumulates()) {
1033 return append_to_string_flag(real_name, value, origin);
1034 } else {
1035 if (value[0] == '\0') {
1036 value = NULL;
1037 }
1038 return set_string_flag(real_name, value, origin);
1039 }
1040 } else {
1041 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1042 }
1043 }
1044
1045 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1046 const char* value = strchr(arg, '=') + 1;
1047 // -XX:Foo:=xxx will reset the string flag to the given value.
1048 if (value[0] == '\0') {
1049 value = NULL;
1050 }
1051 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1052 if (real_name == NULL) {
1053 return false;
1054 }
1055 return set_string_flag(real_name, value, origin);
1056 }
1057
1058 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1059 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1060 #define NUMBER_RANGE "[0123456789eE+-]"
1061 char value[BUFLEN + 1];
1062 char value2[BUFLEN + 1];
1063 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1064 // Looks like a floating-point number -- try again with more lenient format string
1065 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1066 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1067 if (real_name == NULL) {
1068 return false;
1069 }
1070 return set_fp_numeric_flag(real_name, value, origin);
1071 }
1072 }
1073
1074 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1075 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1076 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1077 if (real_name == NULL) {
1078 return false;
1079 }
1080 return set_numeric_flag(real_name, value, origin);
1081 }
1082
1083 return false;
1084 }
1085
1086 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1087 assert(bldarray != NULL, "illegal argument");
1088
1089 if (arg == NULL) {
1090 return;
1091 }
1092
1093 int new_count = *count + 1;
1094
1095 // expand the array and add arg to the last element
1096 if (*bldarray == NULL) {
1097 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1098 } else {
1099 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1100 }
1101 (*bldarray)[*count] = os::strdup_check_oom(arg);
1102 *count = new_count;
1103 }
1104
1105 void Arguments::build_jvm_args(const char* arg) {
1106 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1107 }
1108
1109 void Arguments::build_jvm_flags(const char* arg) {
1110 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1111 }
1112
1113 // utility function to return a string that concatenates all
1114 // strings in a given char** array
1115 const char* Arguments::build_resource_string(char** args, int count) {
1116 if (args == NULL || count == 0) {
1117 return NULL;
1118 }
1119 size_t length = 0;
1120 for (int i = 0; i < count; i++) {
1121 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1122 }
1123 char* s = NEW_RESOURCE_ARRAY(char, length);
1124 char* dst = s;
1125 for (int j = 0; j < count; j++) {
1126 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1127 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1128 dst += offset;
1129 length -= offset;
1130 }
1131 return (const char*) s;
1132 }
1133
1134 void Arguments::print_on(outputStream* st) {
1135 st->print_cr("VM Arguments:");
1136 if (num_jvm_flags() > 0) {
1137 st->print("jvm_flags: "); print_jvm_flags_on(st);
1138 st->cr();
1139 }
1140 if (num_jvm_args() > 0) {
1141 st->print("jvm_args: "); print_jvm_args_on(st);
1142 st->cr();
1143 }
1144 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1145 if (_java_class_path != NULL) {
1146 char* path = _java_class_path->value();
1147 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1148 }
1149 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1150 }
1151
1152 void Arguments::print_summary_on(outputStream* st) {
1153 // Print the command line. Environment variables that are helpful for
1154 // reproducing the problem are written later in the hs_err file.
1155 // flags are from setting file
1156 if (num_jvm_flags() > 0) {
1157 st->print_raw("Settings File: ");
1158 print_jvm_flags_on(st);
1159 st->cr();
1160 }
1161 // args are the command line and environment variable arguments.
1162 st->print_raw("Command Line: ");
1163 if (num_jvm_args() > 0) {
1164 print_jvm_args_on(st);
1165 }
1166 // this is the classfile and any arguments to the java program
1167 if (java_command() != NULL) {
1168 st->print("%s", java_command());
1169 }
1170 st->cr();
1171 }
1172
1173 void Arguments::print_jvm_flags_on(outputStream* st) {
1174 if (_num_jvm_flags > 0) {
1175 for (int i=0; i < _num_jvm_flags; i++) {
1176 st->print("%s ", _jvm_flags_array[i]);
1177 }
1178 }
1179 }
1180
1181 void Arguments::print_jvm_args_on(outputStream* st) {
1182 if (_num_jvm_args > 0) {
1183 for (int i=0; i < _num_jvm_args; i++) {
1184 st->print("%s ", _jvm_args_array[i]);
1185 }
1186 }
1187 }
1188
1189 bool Arguments::process_argument(const char* arg,
1190 jboolean ignore_unrecognized,
1191 Flag::Flags origin) {
1192 JDK_Version since = JDK_Version();
1193
1194 if (parse_argument(arg, origin)) {
1195 return true;
1196 }
1197
1198 // Determine if the flag has '+', '-', or '=' characters.
1199 bool has_plus_minus = (*arg == '+' || *arg == '-');
1200 const char* const argname = has_plus_minus ? arg + 1 : arg;
1201
1202 size_t arg_len;
1203 const char* equal_sign = strchr(argname, '=');
1204 if (equal_sign == NULL) {
1205 arg_len = strlen(argname);
1206 } else {
1207 arg_len = equal_sign - argname;
1208 }
1209
1210 // Only make the obsolete check for valid arguments.
1211 if (arg_len <= BUFLEN) {
1212 // Construct a string which consists only of the argument name without '+', '-', or '='.
1213 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1214 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1215 if (is_obsolete_flag(stripped_argname, &since)) {
1216 char version[256];
1217 since.to_string(version, sizeof(version));
1218 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1219 return true;
1220 }
1221 #ifndef PRODUCT
1222 else {
1223 const char* replacement;
1224 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1225 log_warning(arguments)("%s has been removed. Please use %s instead.",
1226 stripped_argname,
1227 replacement);
1228 return false;
1229 }
1230 }
1231 #endif //PRODUCT
1232 }
1233
1234 // For locked flags, report a custom error message if available.
1235 // Otherwise, report the standard unrecognized VM option.
1236 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1237 if (found_flag != NULL) {
1238 char locked_message_buf[BUFLEN];
1239 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1240 if (strlen(locked_message_buf) == 0) {
1241 if (found_flag->is_bool() && !has_plus_minus) {
1242 jio_fprintf(defaultStream::error_stream(),
1243 "Missing +/- setting for VM option '%s'\n", argname);
1244 } else if (!found_flag->is_bool() && has_plus_minus) {
1245 jio_fprintf(defaultStream::error_stream(),
1246 "Unexpected +/- setting in VM option '%s'\n", argname);
1247 } else {
1248 jio_fprintf(defaultStream::error_stream(),
1249 "Improperly specified VM option '%s'\n", argname);
1250 }
1251 } else {
1252 #ifdef PRODUCT
1253 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1254 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1255 if (ignore_unrecognized && mismatched) {
1256 return true;
1257 }
1258 #endif
1259 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1260 }
1261 } else {
1262 if (ignore_unrecognized) {
1263 return true;
1264 }
1265 jio_fprintf(defaultStream::error_stream(),
1266 "Unrecognized VM option '%s'\n", argname);
1267 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1268 if (fuzzy_matched != NULL) {
1269 jio_fprintf(defaultStream::error_stream(),
1270 "Did you mean '%s%s%s'? ",
1271 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1272 fuzzy_matched->_name,
1273 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1274 }
1275 }
1276
1277 // allow for commandline "commenting out" options like -XX:#+Verbose
1278 return arg[0] == '#';
1279 }
1280
1281 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1282 FILE* stream = fopen(file_name, "rb");
1283 if (stream == NULL) {
1284 if (should_exist) {
1285 jio_fprintf(defaultStream::error_stream(),
1286 "Could not open settings file %s\n", file_name);
1287 return false;
1288 } else {
1289 return true;
1290 }
1291 }
1292
1293 char token[1024];
1294 int pos = 0;
1295
1296 bool in_white_space = true;
1297 bool in_comment = false;
1298 bool in_quote = false;
1299 char quote_c = 0;
1300 bool result = true;
1301
1302 int c = getc(stream);
1303 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1304 if (in_white_space) {
1305 if (in_comment) {
1306 if (c == '\n') in_comment = false;
1307 } else {
1308 if (c == '#') in_comment = true;
1309 else if (!isspace(c)) {
1310 in_white_space = false;
1311 token[pos++] = c;
1312 }
1313 }
1314 } else {
1315 if (c == '\n' || (!in_quote && isspace(c))) {
1316 // token ends at newline, or at unquoted whitespace
1317 // this allows a way to include spaces in string-valued options
1318 token[pos] = '\0';
1319 logOption(token);
1320 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1321 build_jvm_flags(token);
1322 pos = 0;
1323 in_white_space = true;
1324 in_quote = false;
1325 } else if (!in_quote && (c == '\'' || c == '"')) {
1326 in_quote = true;
1327 quote_c = c;
1328 } else if (in_quote && (c == quote_c)) {
1329 in_quote = false;
1330 } else {
1331 token[pos++] = c;
1332 }
1333 }
1334 c = getc(stream);
1335 }
1336 if (pos > 0) {
1337 token[pos] = '\0';
1338 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1339 build_jvm_flags(token);
1340 }
1341 fclose(stream);
1342 return result;
1343 }
1344
1345 //=============================================================================================================
1346 // Parsing of properties (-D)
1347
1348 const char* Arguments::get_property(const char* key) {
1349 return PropertyList_get_value(system_properties(), key);
1350 }
1351
1352 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1353 const char* eq = strchr(prop, '=');
1354 const char* key;
1355 const char* value = "";
1356
1357 if (eq == NULL) {
1358 // property doesn't have a value, thus use passed string
1359 key = prop;
1360 } else {
1361 // property have a value, thus extract it and save to the
1362 // allocated string
1363 size_t key_len = eq - prop;
1364 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1365
1366 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1367 key = tmp_key;
1368
1369 value = &prop[key_len + 1];
1370 }
1371
1372 if (strcmp(key, "java.compiler") == 0) {
1373 process_java_compiler_argument(value);
1374 // Record value in Arguments, but let it get passed to Java.
1375 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1376 strcmp(key, "sun.java.launcher.pid") == 0) {
1377 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1378 // private and are processed in process_sun_java_launcher_properties();
1379 // the sun.java.launcher property is passed on to the java application
1380 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1381 // append is true, writable is true, internal is false
1382 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1383 WriteableProperty, ExternalProperty);
1384 } else {
1385 if (strcmp(key, "sun.java.command") == 0) {
1386 char *old_java_command = _java_command;
1387 _java_command = os::strdup_check_oom(value, mtArguments);
1388 if (old_java_command != NULL) {
1389 os::free(old_java_command);
1390 }
1391 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1392 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1393 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1394 // its value without going through the property list or making a Java call.
1395 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1396 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1397 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1398 os::free((void *)old_java_vendor_url_bug);
1399 }
1400 }
1401
1402 // Create new property and add at the end of the list
1403 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1404 }
1405
1406 if (key != prop) {
1407 // SystemProperty copy passed value, thus free previously allocated
1408 // memory
1409 FreeHeap((void *)key);
1410 }
1411
1412 return true;
1413 }
1414
1415 #if INCLUDE_CDS
1416 void Arguments::check_unsupported_dumping_properties() {
1417 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1418 const char* unsupported_properties[] = { "jdk.module.main",
1419 "jdk.module.limitmods",
1420 "jdk.module.path",
1421 "jdk.module.upgrade.path",
1422 "jdk.module.patch.0" };
1423 const char* unsupported_options[] = { "-m", // cannot use at dump time
1424 "--limit-modules", // ignored at dump time
1425 "--module-path", // ignored at dump time
1426 "--upgrade-module-path", // ignored at dump time
1427 "--patch-module" // ignored at dump time
1428 };
1429 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1430 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1431 // vm will exit with an error message. Otherwise, it will print an informational message if
1432 // -Xlog:cds is enabled.
1433 uint info_idx = 1;
1434 SystemProperty* sp = system_properties();
1435 while (sp != NULL) {
1436 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1437 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1438 if (i < info_idx) {
1439 vm_exit_during_initialization(
1440 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1441 } else {
1442 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1443 unsupported_options[i]);
1444 }
1445 }
1446 }
1447 sp = sp->next();
1448 }
1449
1450 // Check for an exploded module build in use with -Xshare:dump.
1451 if (!has_jimage()) {
1452 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1453 }
1454 }
1455 #endif
1456
1457 //===========================================================================================================
1458 // Setting int/mixed/comp mode flags
1459
1460 void Arguments::set_mode_flags(Mode mode) {
1461 // Set up default values for all flags.
1462 // If you add a flag to any of the branches below,
1463 // add a default value for it here.
1464 set_java_compiler(false);
1465 _mode = mode;
1466
1467 // Ensure Agent_OnLoad has the correct initial values.
1468 // This may not be the final mode; mode may change later in onload phase.
1469 PropertyList_unique_add(&_system_properties, "java.vm.info",
1470 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1471
1472 UseInterpreter = true;
1473 UseCompiler = true;
1474 UseLoopCounter = true;
1475
1476 // Default values may be platform/compiler dependent -
1477 // use the saved values
1478 ClipInlining = Arguments::_ClipInlining;
1479 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1480 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1481 BackgroundCompilation = Arguments::_BackgroundCompilation;
1482 if (TieredCompilation) {
1483 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1484 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1485 }
1486 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1487 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1488 }
1489 }
1490
1491 // Change from defaults based on mode
1492 switch (mode) {
1493 default:
1494 ShouldNotReachHere();
1495 break;
1496 case _int:
1497 UseCompiler = false;
1498 UseLoopCounter = false;
1499 AlwaysCompileLoopMethods = false;
1500 UseOnStackReplacement = false;
1501 break;
1502 case _mixed:
1503 // same as default
1504 break;
1505 case _comp:
1506 UseInterpreter = false;
1507 BackgroundCompilation = false;
1508 ClipInlining = false;
1509 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1510 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1511 // compile a level 4 (C2) and then continue executing it.
1512 if (TieredCompilation) {
1513 Tier3InvokeNotifyFreqLog = 0;
1514 Tier4InvocationThreshold = 0;
1515 }
1516 break;
1517 }
1518 }
1519
1520 // Conflict: required to use shared spaces (-Xshare:on), but
1521 // incompatible command line options were chosen.
1522 static void no_shared_spaces(const char* message) {
1523 if (RequireSharedSpaces) {
1524 jio_fprintf(defaultStream::error_stream(),
1525 "Class data sharing is inconsistent with other specified options.\n");
1526 vm_exit_during_initialization("Unable to use shared archive.", message);
1527 } else {
1528 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1529 }
1530 }
1531
1532 // Returns threshold scaled with the value of scale.
1533 // If scale < 0.0, threshold is returned without scaling.
1534 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1535 if (scale == 1.0 || scale < 0.0) {
1536 return threshold;
1537 } else {
1538 return (intx)(threshold * scale);
1539 }
1540 }
1541
1542 // Returns freq_log scaled with the value of scale.
1543 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1544 // If scale < 0.0, freq_log is returned without scaling.
1545 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1546 // Check if scaling is necessary or if negative value was specified.
1547 if (scale == 1.0 || scale < 0.0) {
1548 return freq_log;
1549 }
1550 // Check values to avoid calculating log2 of 0.
1551 if (scale == 0.0 || freq_log == 0) {
1552 return 0;
1553 }
1554 // Determine the maximum notification frequency value currently supported.
1555 // The largest mask value that the interpreter/C1 can handle is
1556 // of length InvocationCounter::number_of_count_bits. Mask values are always
1557 // one bit shorter then the value of the notification frequency. Set
1558 // max_freq_bits accordingly.
1559 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1560 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1561 if (scaled_freq == 0) {
1562 // Return 0 right away to avoid calculating log2 of 0.
1563 return 0;
1564 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1565 return max_freq_bits;
1566 } else {
1567 return log2_intptr(scaled_freq);
1568 }
1569 }
1570
1571 void Arguments::set_tiered_flags() {
1572 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1573 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1574 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1575 }
1576 if (CompilationPolicyChoice < 2) {
1577 vm_exit_during_initialization(
1578 "Incompatible compilation policy selected", NULL);
1579 }
1580 // Increase the code cache size - tiered compiles a lot more.
1581 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1582 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1583 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1584 }
1585 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1586 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1587 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1588 }
1589 if (!UseInterpreter) { // -Xcomp
1590 Tier3InvokeNotifyFreqLog = 0;
1591 Tier4InvocationThreshold = 0;
1592 }
1593
1594 if (CompileThresholdScaling < 0) {
1595 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1596 }
1597
1598 // Scale tiered compilation thresholds.
1599 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1600 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1601 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1602 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1603
1604 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1605 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1606 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1607 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1608
1609 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1610 // once these thresholds become supported.
1611
1612 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1613 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1614
1615 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1616 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1617
1618 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1619
1620 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1621 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1622 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1623 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1624 }
1625 }
1626
1627 void set_object_alignment() {
1628 // Object alignment.
1629 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1630 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1631 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1632 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1633 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1634 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1635
1636 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1637 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1638
1639 // Oop encoding heap max
1640 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1641
1642 if (SurvivorAlignmentInBytes == 0) {
1643 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1644 }
1645 }
1646
1647 size_t Arguments::max_heap_for_compressed_oops() {
1648 // Avoid sign flip.
1649 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1650 // We need to fit both the NULL page and the heap into the memory budget, while
1651 // keeping alignment constraints of the heap. To guarantee the latter, as the
1652 // NULL page is located before the heap, we pad the NULL page to the conservative
1653 // maximum alignment that the GC may ever impose upon the heap.
1654 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1655 _conservative_max_heap_alignment);
1656
1657 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1658 NOT_LP64(ShouldNotReachHere(); return 0);
1659 }
1660
1661 void Arguments::set_use_compressed_oops() {
1662 #ifndef ZERO
1663 #ifdef _LP64
1664 // MaxHeapSize is not set up properly at this point, but
1665 // the only value that can override MaxHeapSize if we are
1666 // to use UseCompressedOops is InitialHeapSize.
1667 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1668
1669 if (max_heap_size <= max_heap_for_compressed_oops()) {
1670 #if !defined(COMPILER1) || defined(TIERED)
1671 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1672 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1673 }
1674 #endif
1675 } else {
1676 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1677 warning("Max heap size too large for Compressed Oops");
1678 FLAG_SET_DEFAULT(UseCompressedOops, false);
1679 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1680 }
1681 }
1682 #endif // _LP64
1683 #endif // ZERO
1684 }
1685
1686
1687 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1688 // set_use_compressed_oops().
1689 void Arguments::set_use_compressed_klass_ptrs() {
1690 #ifndef ZERO
1691 #ifdef _LP64
1692 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1693 if (!UseCompressedOops) {
1694 if (UseCompressedClassPointers) {
1695 warning("UseCompressedClassPointers requires UseCompressedOops");
1696 }
1697 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1698 } else {
1699 // Turn on UseCompressedClassPointers too
1700 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1701 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1702 }
1703 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1704 if (UseCompressedClassPointers) {
1705 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1706 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1707 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1708 }
1709 }
1710 }
1711 #endif // _LP64
1712 #endif // !ZERO
1713 }
1714
1715 void Arguments::set_conservative_max_heap_alignment() {
1716 // The conservative maximum required alignment for the heap is the maximum of
1717 // the alignments imposed by several sources: any requirements from the heap
1718 // itself, the collector policy and the maximum page size we may run the VM
1719 // with.
1720 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1721 _conservative_max_heap_alignment = MAX4(heap_alignment,
1722 (size_t)os::vm_allocation_granularity(),
1723 os::max_page_size(),
1724 CollectorPolicy::compute_heap_alignment());
1725 }
1726
1727 #ifdef TIERED
1728 bool Arguments::compilation_mode_selected() {
1729 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1730 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1731
1732 }
1733
1734 void Arguments::select_compilation_mode_ergonomically() {
1735 #if defined(_WINDOWS) && !defined(_LP64)
1736 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1737 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1738 }
1739 #endif
1740 if (NeverActAsServerClassMachine) {
1741 set_client_compilation_mode();
1742 }
1743 }
1744 #endif //TIERED
1745
1746 #if INCLUDE_JVMCI
1747 void Arguments::set_jvmci_specific_flags() {
1748 if (UseJVMCICompiler) {
1749 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1750 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1751 }
1752 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1753 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1754 }
1755 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1756 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1757 }
1758 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1759 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1760 }
1761 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1762 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1763 }
1764 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1765 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1766 }
1767 if (TieredStopAtLevel != CompLevel_full_optimization) {
1768 // Currently JVMCI compiler can only work at the full optimization level
1769 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1770 TieredStopAtLevel = CompLevel_full_optimization;
1771 }
1772 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1773 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1774 }
1775 }
1776 }
1777 #endif
1778
1779 jint Arguments::set_ergonomics_flags() {
1780 #ifdef TIERED
1781 if (!compilation_mode_selected()) {
1782 select_compilation_mode_ergonomically();
1783 }
1784 #endif
1785
1786 jint gc_result = GCArguments::initialize();
1787 if (gc_result != JNI_OK) {
1788 return gc_result;
1789 }
1790
1791 #if COMPILER2_OR_JVMCI
1792 // Shared spaces work fine with other GCs but causes bytecode rewriting
1793 // to be disabled, which hurts interpreter performance and decreases
1794 // server performance. When -server is specified, keep the default off
1795 // unless it is asked for. Future work: either add bytecode rewriting
1796 // at link time, or rewrite bytecodes in non-shared methods.
1797 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1798 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1799 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1800 }
1801 #endif
1802
1803 set_conservative_max_heap_alignment();
1804
1805 #ifndef ZERO
1806 #ifdef _LP64
1807 set_use_compressed_oops();
1808
1809 // set_use_compressed_klass_ptrs() must be called after calling
1810 // set_use_compressed_oops().
1811 set_use_compressed_klass_ptrs();
1812
1813 // Also checks that certain machines are slower with compressed oops
1814 // in vm_version initialization code.
1815 #endif // _LP64
1816 #endif // !ZERO
1817
1818 return JNI_OK;
1819 }
1820
1821 void Arguments::set_gc_specific_flags() {
1822 // Set GC flags
1823 GCArguments::arguments()->initialize_flags();
1824 }
1825
1826 julong Arguments::limit_by_allocatable_memory(julong limit) {
1827 julong max_allocatable;
1828 julong result = limit;
1829 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1830 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1831 }
1832 return result;
1833 }
1834
1835 // Use static initialization to get the default before parsing
1836 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1837
1838 void Arguments::set_heap_size() {
1839 julong phys_mem =
1840 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1841 : (julong)MaxRAM;
1842
1843 // Experimental support for CGroup memory limits
1844 if (UseCGroupMemoryLimitForHeap) {
1845 // This is a rough indicator that a CGroup limit may be in force
1846 // for this process
1847 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1848 FILE *fp = fopen(lim_file, "r");
1849 if (fp != NULL) {
1850 julong cgroup_max = 0;
1851 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1852 if (ret == 1 && cgroup_max > 0) {
1853 // If unlimited, cgroup_max will be a very large, but unspecified
1854 // value, so use initial phys_mem as a limit
1855 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1856 JULONG_FORMAT "MB) and initial phys_mem ("
1857 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1858 phys_mem = MIN2(cgroup_max, phys_mem);
1859 } else {
1860 warning("Unable to read/parse cgroup memory limit from %s: %s",
1861 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1862 }
1863 fclose(fp);
1864 } else {
1865 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1866 }
1867 }
1868
1869 // Convert deprecated flags
1870 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1871 !FLAG_IS_DEFAULT(MaxRAMFraction))
1872 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1873
1874 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1875 !FLAG_IS_DEFAULT(MinRAMFraction))
1876 MinRAMPercentage = 100.0 / MinRAMFraction;
1877
1878 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1879 !FLAG_IS_DEFAULT(InitialRAMFraction))
1880 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1881
1882 // If the maximum heap size has not been set with -Xmx,
1883 // then set it as fraction of the size of physical memory,
1884 // respecting the maximum and minimum sizes of the heap.
1885 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1886 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1887 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1888 if (reasonable_min < MaxHeapSize) {
1889 // Small physical memory, so use a minimum fraction of it for the heap
1890 reasonable_max = reasonable_min;
1891 } else {
1892 // Not-small physical memory, so require a heap at least
1893 // as large as MaxHeapSize
1894 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1895 }
1896
1897 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1898 // Limit the heap size to ErgoHeapSizeLimit
1899 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1900 }
1901 if (UseCompressedOops) {
1902 // Limit the heap size to the maximum possible when using compressed oops
1903 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1904
1905 // HeapBaseMinAddress can be greater than default but not less than.
1906 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1907 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1908 // matches compressed oops printing flags
1909 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1910 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1911 DefaultHeapBaseMinAddress,
1912 DefaultHeapBaseMinAddress/G,
1913 HeapBaseMinAddress);
1914 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1915 }
1916 }
1917
1918 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1919 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1920 // but it should be not less than default MaxHeapSize.
1921 max_coop_heap -= HeapBaseMinAddress;
1922 }
1923 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1924 }
1925 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1926
1927 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1928 // An initial heap size was specified on the command line,
1929 // so be sure that the maximum size is consistent. Done
1930 // after call to limit_by_allocatable_memory because that
1931 // method might reduce the allocation size.
1932 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1933 }
1934
1935 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1936 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1937 }
1938
1939 // If the minimum or initial heap_size have not been set or requested to be set
1940 // ergonomically, set them accordingly.
1941 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1942 julong reasonable_minimum = (julong)(OldSize + NewSize);
1943
1944 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1945
1946 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1947
1948 if (InitialHeapSize == 0) {
1949 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1950
1951 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1952 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1953
1954 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1955
1956 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1957 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1958 }
1959 // If the minimum heap size has not been set (via -Xms),
1960 // synchronize with InitialHeapSize to avoid errors with the default value.
1961 if (min_heap_size() == 0) {
1962 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1963 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1964 }
1965 }
1966 }
1967
1968 // This option inspects the machine and attempts to set various
1969 // parameters to be optimal for long-running, memory allocation
1970 // intensive jobs. It is intended for machines with large
1971 // amounts of cpu and memory.
1972 jint Arguments::set_aggressive_heap_flags() {
1973 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1974 // VM, but we may not be able to represent the total physical memory
1975 // available (like having 8gb of memory on a box but using a 32bit VM).
1976 // Thus, we need to make sure we're using a julong for intermediate
1977 // calculations.
1978 julong initHeapSize;
1979 julong total_memory = os::physical_memory();
1980
1981 if (total_memory < (julong) 256 * M) {
1982 jio_fprintf(defaultStream::error_stream(),
1983 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1984 vm_exit(1);
1985 }
1986
1987 // The heap size is half of available memory, or (at most)
1988 // all of possible memory less 160mb (leaving room for the OS
1989 // when using ISM). This is the maximum; because adaptive sizing
1990 // is turned on below, the actual space used may be smaller.
1991
1992 initHeapSize = MIN2(total_memory / (julong) 2,
1993 total_memory - (julong) 160 * M);
1994
1995 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1996
1997 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1998 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
1999 return JNI_EINVAL;
2000 }
2001 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2002 return JNI_EINVAL;
2003 }
2004 // Currently the minimum size and the initial heap sizes are the same.
2005 set_min_heap_size(initHeapSize);
2006 }
2007 if (FLAG_IS_DEFAULT(NewSize)) {
2008 // Make the young generation 3/8ths of the total heap.
2009 if (FLAG_SET_CMDLINE(size_t, NewSize,
2010 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2011 return JNI_EINVAL;
2012 }
2013 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2014 return JNI_EINVAL;
2015 }
2016 }
2017
2018 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2019 FLAG_SET_DEFAULT(UseLargePages, true);
2020 #endif
2021
2022 // Increase some data structure sizes for efficiency
2023 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2024 return JNI_EINVAL;
2025 }
2026 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2027 return JNI_EINVAL;
2028 }
2029 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2030 return JNI_EINVAL;
2031 }
2032
2033 // See the OldPLABSize comment below, but replace 'after promotion'
2034 // with 'after copying'. YoungPLABSize is the size of the survivor
2035 // space per-gc-thread buffers. The default is 4kw.
2036 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2037 return JNI_EINVAL;
2038 }
2039
2040 // OldPLABSize is the size of the buffers in the old gen that
2041 // UseParallelGC uses to promote live data that doesn't fit in the
2042 // survivor spaces. At any given time, there's one for each gc thread.
2043 // The default size is 1kw. These buffers are rarely used, since the
2044 // survivor spaces are usually big enough. For specjbb, however, there
2045 // are occasions when there's lots of live data in the young gen
2046 // and we end up promoting some of it. We don't have a definite
2047 // explanation for why bumping OldPLABSize helps, but the theory
2048 // is that a bigger PLAB results in retaining something like the
2049 // original allocation order after promotion, which improves mutator
2050 // locality. A minor effect may be that larger PLABs reduce the
2051 // number of PLAB allocation events during gc. The value of 8kw
2052 // was arrived at by experimenting with specjbb.
2053 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2054 return JNI_EINVAL;
2055 }
2056
2057 // Enable parallel GC and adaptive generation sizing
2058 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2059 return JNI_EINVAL;
2060 }
2061
2062 // Encourage steady state memory management
2063 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2064 return JNI_EINVAL;
2065 }
2066
2067 // This appears to improve mutator locality
2068 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2069 return JNI_EINVAL;
2070 }
2071
2072 // Get around early Solaris scheduling bug
2073 // (affinity vs other jobs on system)
2074 // but disallow DR and offlining (5008695).
2075 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2076 return JNI_EINVAL;
2077 }
2078
2079 return JNI_OK;
2080 }
2081
2082 // This must be called after ergonomics.
2083 void Arguments::set_bytecode_flags() {
2084 if (!RewriteBytecodes) {
2085 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2086 }
2087 }
2088
2089 // Aggressive optimization flags -XX:+AggressiveOpts
2090 jint Arguments::set_aggressive_opts_flags() {
2091 #ifdef COMPILER2
2092 if (AggressiveUnboxing) {
2093 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2094 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2095 } else if (!EliminateAutoBox) {
2096 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2097 AggressiveUnboxing = false;
2098 }
2099 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2100 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2101 } else if (!DoEscapeAnalysis) {
2102 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2103 AggressiveUnboxing = false;
2104 }
2105 }
2106 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2107 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2108 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2109 }
2110 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2111 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2112 }
2113
2114 // Feed the cache size setting into the JDK
2115 char buffer[1024];
2116 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2117 if (!add_property(buffer)) {
2118 return JNI_ENOMEM;
2119 }
2120 }
2121 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2122 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2123 }
2124 #endif
2125
2126 if (AggressiveOpts) {
2127 // Sample flag setting code
2128 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2129 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2130 // }
2131 }
2132
2133 return JNI_OK;
2134 }
2135
2136 //===========================================================================================================
2137 // Parsing of java.compiler property
2138
2139 void Arguments::process_java_compiler_argument(const char* arg) {
2140 // For backwards compatibility, Djava.compiler=NONE or ""
2141 // causes us to switch to -Xint mode UNLESS -Xdebug
2142 // is also specified.
2143 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2144 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2145 }
2146 }
2147
2148 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2149 _sun_java_launcher = os::strdup_check_oom(launcher);
2150 }
2151
2152 bool Arguments::created_by_java_launcher() {
2153 assert(_sun_java_launcher != NULL, "property must have value");
2154 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2155 }
2156
2157 bool Arguments::sun_java_launcher_is_altjvm() {
2158 return _sun_java_launcher_is_altjvm;
2159 }
2160
2161 //===========================================================================================================
2162 // Parsing of main arguments
2163
2164 #if INCLUDE_JVMCI
2165 // Check consistency of jvmci vm argument settings.
2166 bool Arguments::check_jvmci_args_consistency() {
2167 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2168 }
2169 #endif //INCLUDE_JVMCI
2170
2171 // Check consistency of GC selection
2172 bool Arguments::check_gc_consistency() {
2173 // Ensure that the user has not selected conflicting sets
2174 // of collectors.
2175 uint i = 0;
2176 if (UseSerialGC) i++;
2177 if (UseConcMarkSweepGC) i++;
2178 if (UseParallelGC || UseParallelOldGC) i++;
2179 if (UseG1GC) i++;
2180 if (i > 1) {
2181 jio_fprintf(defaultStream::error_stream(),
2182 "Conflicting collector combinations in option list; "
2183 "please refer to the release notes for the combinations "
2184 "allowed\n");
2185 return false;
2186 }
2187
2188 return true;
2189 }
2190
2191 // Check the consistency of vm_init_args
2192 bool Arguments::check_vm_args_consistency() {
2193 // Method for adding checks for flag consistency.
2194 // The intent is to warn the user of all possible conflicts,
2195 // before returning an error.
2196 // Note: Needs platform-dependent factoring.
2197 bool status = true;
2198
2199 if (TLABRefillWasteFraction == 0) {
2200 jio_fprintf(defaultStream::error_stream(),
2201 "TLABRefillWasteFraction should be a denominator, "
2202 "not " SIZE_FORMAT "\n",
2203 TLABRefillWasteFraction);
2204 status = false;
2205 }
2206
2207 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2208 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2209 }
2210
2211 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2212 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2213 }
2214
2215 if (GCTimeLimit == 100) {
2216 // Turn off gc-overhead-limit-exceeded checks
2217 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2218 }
2219
2220 status = status && check_gc_consistency();
2221
2222 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2223 // insists that we hold the requisite locks so that the iteration is
2224 // MT-safe. For the verification at start-up and shut-down, we don't
2225 // yet have a good way of acquiring and releasing these locks,
2226 // which are not visible at the CollectedHeap level. We want to
2227 // be able to acquire these locks and then do the iteration rather
2228 // than just disable the lock verification. This will be fixed under
2229 // bug 4788986.
2230 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2231 if (VerifyDuringStartup) {
2232 warning("Heap verification at start-up disabled "
2233 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2234 VerifyDuringStartup = false; // Disable verification at start-up
2235 }
2236
2237 if (VerifyBeforeExit) {
2238 warning("Heap verification at shutdown disabled "
2239 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2240 VerifyBeforeExit = false; // Disable verification at shutdown
2241 }
2242 }
2243
2244 if (PrintNMTStatistics) {
2245 #if INCLUDE_NMT
2246 if (MemTracker::tracking_level() == NMT_off) {
2247 #endif // INCLUDE_NMT
2248 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2249 PrintNMTStatistics = false;
2250 #if INCLUDE_NMT
2251 }
2252 #endif
2253 }
2254
2255 #if INCLUDE_JVMCI
2256 status = status && check_jvmci_args_consistency();
2257
2258 if (EnableJVMCI) {
2259 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2260 AddProperty, UnwriteableProperty, InternalProperty);
2261
2262 if (!ScavengeRootsInCode) {
2263 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2264 ScavengeRootsInCode = 1;
2265 }
2266 }
2267 #endif
2268
2269 // Check lower bounds of the code cache
2270 // Template Interpreter code is approximately 3X larger in debug builds.
2271 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2272 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2273 jio_fprintf(defaultStream::error_stream(),
2274 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2275 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2276 status = false;
2277 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2280 min_code_cache_size/K);
2281 status = false;
2282 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2283 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2284 jio_fprintf(defaultStream::error_stream(),
2285 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2286 CODE_CACHE_SIZE_LIMIT/M);
2287 status = false;
2288 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2291 min_code_cache_size/K);
2292 status = false;
2293 }
2294
2295 #ifdef _LP64
2296 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2297 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2298 }
2299 #endif
2300
2301 #ifndef SUPPORT_RESERVED_STACK_AREA
2302 if (StackReservedPages != 0) {
2303 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2304 warning("Reserved Stack Area not supported on this platform");
2305 }
2306 #endif
2307
2308 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2309 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2310 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2311 }
2312 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2313 }
2314 if (UseCompiler && is_interpreter_only()) {
2315 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2316 warning("UseCompiler disabled due to -Xint.");
2317 }
2318 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2319 }
2320 #ifdef COMPILER2
2321 if (PostLoopMultiversioning && !RangeCheckElimination) {
2322 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2323 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2324 }
2325 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2326 }
2327 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2328 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2329 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2330 }
2331 LoopStripMiningIter = 1;
2332 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2333 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2334 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2335 }
2336 LoopStripMiningIter = 0;
2337 }
2338 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2339 // blind guess
2340 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2341 }
2342 #endif
2343 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2344 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2345 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2346 }
2347 }
2348 return status;
2349 }
2350
2351 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2352 const char* option_type) {
2353 if (ignore) return false;
2354
2355 const char* spacer = " ";
2356 if (option_type == NULL) {
2357 option_type = ++spacer; // Set both to the empty string.
2358 }
2359
2360 if (os::obsolete_option(option)) {
2361 jio_fprintf(defaultStream::error_stream(),
2362 "Obsolete %s%soption: %s\n", option_type, spacer,
2363 option->optionString);
2364 return false;
2365 } else {
2366 jio_fprintf(defaultStream::error_stream(),
2367 "Unrecognized %s%soption: %s\n", option_type, spacer,
2368 option->optionString);
2369 return true;
2370 }
2371 }
2372
2373 static const char* user_assertion_options[] = {
2374 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2375 };
2376
2377 static const char* system_assertion_options[] = {
2378 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2379 };
2380
2381 bool Arguments::parse_uintx(const char* value,
2382 uintx* uintx_arg,
2383 uintx min_size) {
2384
2385 // Check the sign first since atojulong() parses only unsigned values.
2386 bool value_is_positive = !(*value == '-');
2387
2388 if (value_is_positive) {
2389 julong n;
2390 bool good_return = atojulong(value, &n);
2391 if (good_return) {
2392 bool above_minimum = n >= min_size;
2393 bool value_is_too_large = n > max_uintx;
2394
2395 if (above_minimum && !value_is_too_large) {
2396 *uintx_arg = n;
2397 return true;
2398 }
2399 }
2400 }
2401 return false;
2402 }
2403
2404 unsigned int addreads_count = 0;
2405 unsigned int addexports_count = 0;
2406 unsigned int addopens_count = 0;
2407 unsigned int addmods_count = 0;
2408 unsigned int patch_mod_count = 0;
2409
2410 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2411 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2412 char* property = AllocateHeap(prop_len, mtArguments);
2413 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2414 if (ret < 0 || ret >= (int)prop_len) {
2415 FreeHeap(property);
2416 return false;
2417 }
2418 bool added = add_property(property, UnwriteableProperty, internal);
2419 FreeHeap(property);
2420 return added;
2421 }
2422
2423 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2424 const unsigned int props_count_limit = 1000;
2425 const int max_digits = 3;
2426 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2427
2428 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2429 if (count < props_count_limit) {
2430 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2431 char* property = AllocateHeap(prop_len, mtArguments);
2432 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2433 if (ret < 0 || ret >= (int)prop_len) {
2434 FreeHeap(property);
2435 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2436 return false;
2437 }
2438 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2439 FreeHeap(property);
2440 return added;
2441 }
2442
2443 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2444 return false;
2445 }
2446
2447 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2448 julong* long_arg,
2449 julong min_size,
2450 julong max_size) {
2451 if (!atojulong(s, long_arg)) return arg_unreadable;
2452 return check_memory_size(*long_arg, min_size, max_size);
2453 }
2454
2455 // Parse JavaVMInitArgs structure
2456
2457 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2458 const JavaVMInitArgs *java_options_args,
2459 const JavaVMInitArgs *cmd_line_args) {
2460 bool patch_mod_javabase = false;
2461
2462 // Save default settings for some mode flags
2463 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2464 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2465 Arguments::_ClipInlining = ClipInlining;
2466 Arguments::_BackgroundCompilation = BackgroundCompilation;
2467 if (TieredCompilation) {
2468 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2469 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2470 }
2471
2472 // Setup flags for mixed which is the default
2473 set_mode_flags(_mixed);
2474
2475 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2476 // variable (if present).
2477 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2478 if (result != JNI_OK) {
2479 return result;
2480 }
2481
2482 // Parse args structure generated from the command line flags.
2483 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2484 if (result != JNI_OK) {
2485 return result;
2486 }
2487
2488 // Parse args structure generated from the _JAVA_OPTIONS environment
2489 // variable (if present) (mimics classic VM)
2490 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2491 if (result != JNI_OK) {
2492 return result;
2493 }
2494
2495 // We need to ensure processor and memory resources have been properly
2496 // configured - which may rely on arguments we just processed - before
2497 // doing the final argument processing. Any argument processing that
2498 // needs to know about processor and memory resources must occur after
2499 // this point.
2500
2501 os::init_container_support();
2502
2503 // Do final processing now that all arguments have been parsed
2504 result = finalize_vm_init_args(patch_mod_javabase);
2505 if (result != JNI_OK) {
2506 return result;
2507 }
2508
2509 return JNI_OK;
2510 }
2511
2512 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2513 // represents a valid JDWP agent. is_path==true denotes that we
2514 // are dealing with -agentpath (case where name is a path), otherwise with
2515 // -agentlib
2516 bool valid_jdwp_agent(char *name, bool is_path) {
2517 char *_name;
2518 const char *_jdwp = "jdwp";
2519 size_t _len_jdwp, _len_prefix;
2520
2521 if (is_path) {
2522 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2523 return false;
2524 }
2525
2526 _name++; // skip past last path separator
2527 _len_prefix = strlen(JNI_LIB_PREFIX);
2528
2529 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2530 return false;
2531 }
2532
2533 _name += _len_prefix;
2534 _len_jdwp = strlen(_jdwp);
2535
2536 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2537 _name += _len_jdwp;
2538 }
2539 else {
2540 return false;
2541 }
2542
2543 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2544 return false;
2545 }
2546
2547 return true;
2548 }
2549
2550 if (strcmp(name, _jdwp) == 0) {
2551 return true;
2552 }
2553
2554 return false;
2555 }
2556
2557 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2558 // --patch-module=<module>=<file>(<pathsep><file>)*
2559 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2560 // Find the equal sign between the module name and the path specification
2561 const char* module_equal = strchr(patch_mod_tail, '=');
2562 if (module_equal == NULL) {
2563 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2564 return JNI_ERR;
2565 } else {
2566 // Pick out the module name
2567 size_t module_len = module_equal - patch_mod_tail;
2568 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2569 if (module_name != NULL) {
2570 memcpy(module_name, patch_mod_tail, module_len);
2571 *(module_name + module_len) = '\0';
2572 // The path piece begins one past the module_equal sign
2573 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2574 FREE_C_HEAP_ARRAY(char, module_name);
2575 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2576 return JNI_ENOMEM;
2577 }
2578 } else {
2579 return JNI_ENOMEM;
2580 }
2581 }
2582 return JNI_OK;
2583 }
2584
2585 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2586 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2587 // The min and max sizes match the values in globals.hpp, but scaled
2588 // with K. The values have been chosen so that alignment with page
2589 // size doesn't change the max value, which makes the conversions
2590 // back and forth between Xss value and ThreadStackSize value easier.
2591 // The values have also been chosen to fit inside a 32-bit signed type.
2592 const julong min_ThreadStackSize = 0;
2593 const julong max_ThreadStackSize = 1 * M;
2594
2595 const julong min_size = min_ThreadStackSize * K;
2596 const julong max_size = max_ThreadStackSize * K;
2597
2598 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2599
2600 julong size = 0;
2601 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2602 if (errcode != arg_in_range) {
2603 bool silent = (option == NULL); // Allow testing to silence error messages
2604 if (!silent) {
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Invalid thread stack size: %s\n", option->optionString);
2607 describe_range_error(errcode);
2608 }
2609 return JNI_EINVAL;
2610 }
2611
2612 // Internally track ThreadStackSize in units of 1024 bytes.
2613 const julong size_aligned = align_up(size, K);
2614 assert(size <= size_aligned,
2615 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2616 size, size_aligned);
2617
2618 const julong size_in_K = size_aligned / K;
2619 assert(size_in_K < (julong)max_intx,
2620 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2621 size_in_K);
2622
2623 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2624 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2625 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2626 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2627 max_expanded, size_in_K);
2628
2629 *out_ThreadStackSize = (intx)size_in_K;
2630
2631 return JNI_OK;
2632 }
2633
2634 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2635 // For match_option to return remaining or value part of option string
2636 const char* tail;
2637
2638 // iterate over arguments
2639 for (int index = 0; index < args->nOptions; index++) {
2640 bool is_absolute_path = false; // for -agentpath vs -agentlib
2641
2642 const JavaVMOption* option = args->options + index;
2643
2644 if (!match_option(option, "-Djava.class.path", &tail) &&
2645 !match_option(option, "-Dsun.java.command", &tail) &&
2646 !match_option(option, "-Dsun.java.launcher", &tail)) {
2647
2648 // add all jvm options to the jvm_args string. This string
2649 // is used later to set the java.vm.args PerfData string constant.
2650 // the -Djava.class.path and the -Dsun.java.command options are
2651 // omitted from jvm_args string as each have their own PerfData
2652 // string constant object.
2653 build_jvm_args(option->optionString);
2654 }
2655
2656 // -verbose:[class/module/gc/jni]
2657 if (match_option(option, "-verbose", &tail)) {
2658 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2659 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2660 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2661 } else if (!strcmp(tail, ":module")) {
2662 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2663 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2664 } else if (!strcmp(tail, ":gc")) {
2665 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2666 } else if (!strcmp(tail, ":jni")) {
2667 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2668 return JNI_EINVAL;
2669 }
2670 }
2671 // -da / -ea / -disableassertions / -enableassertions
2672 // These accept an optional class/package name separated by a colon, e.g.,
2673 // -da:java.lang.Thread.
2674 } else if (match_option(option, user_assertion_options, &tail, true)) {
2675 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2676 if (*tail == '\0') {
2677 JavaAssertions::setUserClassDefault(enable);
2678 } else {
2679 assert(*tail == ':', "bogus match by match_option()");
2680 JavaAssertions::addOption(tail + 1, enable);
2681 }
2682 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2683 } else if (match_option(option, system_assertion_options, &tail, false)) {
2684 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2685 JavaAssertions::setSystemClassDefault(enable);
2686 // -bootclasspath:
2687 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2688 jio_fprintf(defaultStream::output_stream(),
2689 "-Xbootclasspath is no longer a supported option.\n");
2690 return JNI_EINVAL;
2691 // -bootclasspath/a:
2692 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2693 Arguments::append_sysclasspath(tail);
2694 // -bootclasspath/p:
2695 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2696 jio_fprintf(defaultStream::output_stream(),
2697 "-Xbootclasspath/p is no longer a supported option.\n");
2698 return JNI_EINVAL;
2699 // -Xrun
2700 } else if (match_option(option, "-Xrun", &tail)) {
2701 if (tail != NULL) {
2702 const char* pos = strchr(tail, ':');
2703 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2704 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2705 jio_snprintf(name, len + 1, "%s", tail);
2706
2707 char *options = NULL;
2708 if(pos != NULL) {
2709 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2710 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2711 }
2712 #if !INCLUDE_JVMTI
2713 if (strcmp(name, "jdwp") == 0) {
2714 jio_fprintf(defaultStream::error_stream(),
2715 "Debugging agents are not supported in this VM\n");
2716 return JNI_ERR;
2717 }
2718 #endif // !INCLUDE_JVMTI
2719 add_init_library(name, options);
2720 }
2721 } else if (match_option(option, "--add-reads=", &tail)) {
2722 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2723 return JNI_ENOMEM;
2724 }
2725 } else if (match_option(option, "--add-exports=", &tail)) {
2726 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2727 return JNI_ENOMEM;
2728 }
2729 } else if (match_option(option, "--add-opens=", &tail)) {
2730 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2731 return JNI_ENOMEM;
2732 }
2733 } else if (match_option(option, "--add-modules=", &tail)) {
2734 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2735 return JNI_ENOMEM;
2736 }
2737 } else if (match_option(option, "--limit-modules=", &tail)) {
2738 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2739 return JNI_ENOMEM;
2740 }
2741 } else if (match_option(option, "--module-path=", &tail)) {
2742 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2743 return JNI_ENOMEM;
2744 }
2745 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2746 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2747 return JNI_ENOMEM;
2748 }
2749 } else if (match_option(option, "--patch-module=", &tail)) {
2750 // --patch-module=<module>=<file>(<pathsep><file>)*
2751 int res = process_patch_mod_option(tail, patch_mod_javabase);
2752 if (res != JNI_OK) {
2753 return res;
2754 }
2755 } else if (match_option(option, "--illegal-access=", &tail)) {
2756 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2757 return JNI_ENOMEM;
2758 }
2759 // -agentlib and -agentpath
2760 } else if (match_option(option, "-agentlib:", &tail) ||
2761 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2762 if(tail != NULL) {
2763 const char* pos = strchr(tail, '=');
2764 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2765 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2766 name[len] = '\0';
2767
2768 char *options = NULL;
2769 if(pos != NULL) {
2770 options = os::strdup_check_oom(pos + 1, mtArguments);
2771 }
2772 #if !INCLUDE_JVMTI
2773 if (valid_jdwp_agent(name, is_absolute_path)) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Debugging agents are not supported in this VM\n");
2776 return JNI_ERR;
2777 }
2778 #endif // !INCLUDE_JVMTI
2779 add_init_agent(name, options, is_absolute_path);
2780 }
2781 // -javaagent
2782 } else if (match_option(option, "-javaagent:", &tail)) {
2783 #if !INCLUDE_JVMTI
2784 jio_fprintf(defaultStream::error_stream(),
2785 "Instrumentation agents are not supported in this VM\n");
2786 return JNI_ERR;
2787 #else
2788 if (tail != NULL) {
2789 size_t length = strlen(tail) + 1;
2790 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2791 jio_snprintf(options, length, "%s", tail);
2792 add_init_agent("instrument", options, false);
2793 // java agents need module java.instrument
2794 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2795 return JNI_ENOMEM;
2796 }
2797 }
2798 #endif // !INCLUDE_JVMTI
2799 // -Xnoclassgc
2800 } else if (match_option(option, "-Xnoclassgc")) {
2801 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 // -Xconcgc
2805 } else if (match_option(option, "-Xconcgc")) {
2806 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2807 return JNI_EINVAL;
2808 }
2809 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2810 // -Xnoconcgc
2811 } else if (match_option(option, "-Xnoconcgc")) {
2812 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2816 // -Xbatch
2817 } else if (match_option(option, "-Xbatch")) {
2818 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2819 return JNI_EINVAL;
2820 }
2821 // -Xmn for compatibility with other JVM vendors
2822 } else if (match_option(option, "-Xmn", &tail)) {
2823 julong long_initial_young_size = 0;
2824 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2825 if (errcode != arg_in_range) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Invalid initial young generation size: %s\n", option->optionString);
2828 describe_range_error(errcode);
2829 return JNI_EINVAL;
2830 }
2831 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 // -Xms
2838 } else if (match_option(option, "-Xms", &tail)) {
2839 julong long_initial_heap_size = 0;
2840 // an initial heap size of 0 means automatically determine
2841 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2842 if (errcode != arg_in_range) {
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Invalid initial heap size: %s\n", option->optionString);
2845 describe_range_error(errcode);
2846 return JNI_EINVAL;
2847 }
2848 set_min_heap_size((size_t)long_initial_heap_size);
2849 // Currently the minimum size and the initial heap sizes are the same.
2850 // Can be overridden with -XX:InitialHeapSize.
2851 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2852 return JNI_EINVAL;
2853 }
2854 // -Xmx
2855 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2856 julong long_max_heap_size = 0;
2857 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2858 if (errcode != arg_in_range) {
2859 jio_fprintf(defaultStream::error_stream(),
2860 "Invalid maximum heap size: %s\n", option->optionString);
2861 describe_range_error(errcode);
2862 return JNI_EINVAL;
2863 }
2864 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2865 return JNI_EINVAL;
2866 }
2867 // Xmaxf
2868 } else if (match_option(option, "-Xmaxf", &tail)) {
2869 char* err;
2870 int maxf = (int)(strtod(tail, &err) * 100);
2871 if (*err != '\0' || *tail == '\0') {
2872 jio_fprintf(defaultStream::error_stream(),
2873 "Bad max heap free percentage size: %s\n",
2874 option->optionString);
2875 return JNI_EINVAL;
2876 } else {
2877 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 }
2881 // Xminf
2882 } else if (match_option(option, "-Xminf", &tail)) {
2883 char* err;
2884 int minf = (int)(strtod(tail, &err) * 100);
2885 if (*err != '\0' || *tail == '\0') {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Bad min heap free percentage size: %s\n",
2888 option->optionString);
2889 return JNI_EINVAL;
2890 } else {
2891 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 }
2895 // -Xss
2896 } else if (match_option(option, "-Xss", &tail)) {
2897 intx value = 0;
2898 jint err = parse_xss(option, tail, &value);
2899 if (err != JNI_OK) {
2900 return err;
2901 }
2902 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2903 return JNI_EINVAL;
2904 }
2905 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2906 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2907 julong long_ReservedCodeCacheSize = 0;
2908
2909 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2910 if (errcode != arg_in_range) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Invalid maximum code cache size: %s.\n", option->optionString);
2913 return JNI_EINVAL;
2914 }
2915 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2916 return JNI_EINVAL;
2917 }
2918 // -green
2919 } else if (match_option(option, "-green")) {
2920 jio_fprintf(defaultStream::error_stream(),
2921 "Green threads support not available\n");
2922 return JNI_EINVAL;
2923 // -native
2924 } else if (match_option(option, "-native")) {
2925 // HotSpot always uses native threads, ignore silently for compatibility
2926 // -Xrs
2927 } else if (match_option(option, "-Xrs")) {
2928 // Classic/EVM option, new functionality
2929 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 // -Xprof
2933 } else if (match_option(option, "-Xprof")) {
2934 char version[256];
2935 // Obsolete in JDK 10
2936 JDK_Version::jdk(10).to_string(version, sizeof(version));
2937 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2938 // -Xconcurrentio
2939 } else if (match_option(option, "-Xconcurrentio")) {
2940 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2947 return JNI_EINVAL;
2948 }
2949 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2950 return JNI_EINVAL;
2951 }
2952 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2953 return JNI_EINVAL;
2954 }
2955
2956 // -Xinternalversion
2957 } else if (match_option(option, "-Xinternalversion")) {
2958 jio_fprintf(defaultStream::output_stream(), "%s\n",
2959 VM_Version::internal_vm_info_string());
2960 vm_exit(0);
2961 #ifndef PRODUCT
2962 // -Xprintflags
2963 } else if (match_option(option, "-Xprintflags")) {
2964 CommandLineFlags::printFlags(tty, false);
2965 vm_exit(0);
2966 #endif
2967 // -D
2968 } else if (match_option(option, "-D", &tail)) {
2969 const char* value;
2970 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2971 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2972 // abort if -Djava.endorsed.dirs is set
2973 jio_fprintf(defaultStream::output_stream(),
2974 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2975 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2976 return JNI_EINVAL;
2977 }
2978 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2979 *value != '\0' && strcmp(value, "\"\"") != 0) {
2980 // abort if -Djava.ext.dirs is set
2981 jio_fprintf(defaultStream::output_stream(),
2982 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2983 return JNI_EINVAL;
2984 }
2985 // Check for module related properties. They must be set using the modules
2986 // options. For example: use "--add-modules=java.sql", not
2987 // "-Djdk.module.addmods=java.sql"
2988 if (is_internal_module_property(option->optionString + 2)) {
2989 needs_module_property_warning = true;
2990 continue;
2991 }
2992
2993 if (!add_property(tail)) {
2994 return JNI_ENOMEM;
2995 }
2996 // Out of the box management support
2997 if (match_option(option, "-Dcom.sun.management", &tail)) {
2998 #if INCLUDE_MANAGEMENT
2999 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3000 return JNI_EINVAL;
3001 }
3002 // management agent in module jdk.management.agent
3003 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3004 return JNI_ENOMEM;
3005 }
3006 #else
3007 jio_fprintf(defaultStream::output_stream(),
3008 "-Dcom.sun.management is not supported in this VM.\n");
3009 return JNI_ERR;
3010 #endif
3011 }
3012 // -Xint
3013 } else if (match_option(option, "-Xint")) {
3014 set_mode_flags(_int);
3015 // -Xmixed
3016 } else if (match_option(option, "-Xmixed")) {
3017 set_mode_flags(_mixed);
3018 // -Xcomp
3019 } else if (match_option(option, "-Xcomp")) {
3020 // for testing the compiler; turn off all flags that inhibit compilation
3021 set_mode_flags(_comp);
3022 // -Xshare:dump
3023 } else if (match_option(option, "-Xshare:dump")) {
3024 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 set_mode_flags(_int); // Prevent compilation, which creates objects
3028 // -Xshare:on
3029 } else if (match_option(option, "-Xshare:on")) {
3030 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3034 return JNI_EINVAL;
3035 }
3036 // -Xshare:auto
3037 } else if (match_option(option, "-Xshare:auto")) {
3038 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3042 return JNI_EINVAL;
3043 }
3044 // -Xshare:off
3045 } else if (match_option(option, "-Xshare:off")) {
3046 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3050 return JNI_EINVAL;
3051 }
3052 // -Xverify
3053 } else if (match_option(option, "-Xverify", &tail)) {
3054 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3055 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3056 return JNI_EINVAL;
3057 }
3058 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 } else if (strcmp(tail, ":remote") == 0) {
3062 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3063 return JNI_EINVAL;
3064 }
3065 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 } else if (strcmp(tail, ":none") == 0) {
3069 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3070 return JNI_EINVAL;
3071 }
3072 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3073 return JNI_EINVAL;
3074 }
3075 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3076 return JNI_EINVAL;
3077 }
3078 // -Xdebug
3079 } else if (match_option(option, "-Xdebug")) {
3080 // note this flag has been used, then ignore
3081 set_xdebug_mode(true);
3082 // -Xnoagent
3083 } else if (match_option(option, "-Xnoagent")) {
3084 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3085 } else if (match_option(option, "-Xloggc:", &tail)) {
3086 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3087 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3088 _gc_log_filename = os::strdup_check_oom(tail);
3089 } else if (match_option(option, "-Xlog", &tail)) {
3090 bool ret = false;
3091 if (strcmp(tail, ":help") == 0) {
3092 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3093 vm_exit(0);
3094 } else if (strcmp(tail, ":disable") == 0) {
3095 LogConfiguration::disable_logging();
3096 ret = true;
3097 } else if (*tail == '\0') {
3098 ret = LogConfiguration::parse_command_line_arguments();
3099 assert(ret, "-Xlog without arguments should never fail to parse");
3100 } else if (*tail == ':') {
3101 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3102 }
3103 if (ret == false) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid -Xlog option '-Xlog%s'\n",
3106 tail);
3107 return JNI_EINVAL;
3108 }
3109 // JNI hooks
3110 } else if (match_option(option, "-Xcheck", &tail)) {
3111 if (!strcmp(tail, ":jni")) {
3112 #if !INCLUDE_JNI_CHECK
3113 warning("JNI CHECKING is not supported in this VM");
3114 #else
3115 CheckJNICalls = true;
3116 #endif // INCLUDE_JNI_CHECK
3117 } else if (is_bad_option(option, args->ignoreUnrecognized,
3118 "check")) {
3119 return JNI_EINVAL;
3120 }
3121 } else if (match_option(option, "vfprintf")) {
3122 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3123 } else if (match_option(option, "exit")) {
3124 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3125 } else if (match_option(option, "abort")) {
3126 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3127 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3128 // and the last option wins.
3129 } else if (match_option(option, "-XX:+NeverTenure")) {
3130 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3134 return JNI_EINVAL;
3135 }
3136 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3137 return JNI_EINVAL;
3138 }
3139 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3140 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3141 return JNI_EINVAL;
3142 }
3143 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3144 return JNI_EINVAL;
3145 }
3146 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3150 uintx max_tenuring_thresh = 0;
3151 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3154 return JNI_EINVAL;
3155 }
3156
3157 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3158 return JNI_EINVAL;
3159 }
3160
3161 if (MaxTenuringThreshold == 0) {
3162 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3163 return JNI_EINVAL;
3164 }
3165 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3166 return JNI_EINVAL;
3167 }
3168 } else {
3169 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3170 return JNI_EINVAL;
3171 }
3172 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3173 return JNI_EINVAL;
3174 }
3175 }
3176 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3177 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3184 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3188 return JNI_EINVAL;
3189 }
3190 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3191 #if defined(DTRACE_ENABLED)
3192 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 #else // defined(DTRACE_ENABLED)
3205 jio_fprintf(defaultStream::error_stream(),
3206 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3207 return JNI_EINVAL;
3208 #endif // defined(DTRACE_ENABLED)
3209 #ifdef ASSERT
3210 } else if (match_option(option, "-XX:+FullGCALot")) {
3211 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3212 return JNI_EINVAL;
3213 }
3214 // disable scavenge before parallel mark-compact
3215 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3216 return JNI_EINVAL;
3217 }
3218 #endif
3219 #if !INCLUDE_MANAGEMENT
3220 } else if (match_option(option, "-XX:+ManagementServer")) {
3221 jio_fprintf(defaultStream::error_stream(),
3222 "ManagementServer is not supported in this VM.\n");
3223 return JNI_ERR;
3224 #endif // INCLUDE_MANAGEMENT
3225 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3226 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3227 // already been handled
3228 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3229 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3230 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3231 return JNI_EINVAL;
3232 }
3233 }
3234 // Unknown option
3235 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3236 return JNI_ERR;
3237 }
3238 }
3239
3240 // PrintSharedArchiveAndExit will turn on
3241 // -Xshare:on
3242 // -Xlog:class+path=info
3243 if (PrintSharedArchiveAndExit) {
3244 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3245 return JNI_EINVAL;
3246 }
3247 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3248 return JNI_EINVAL;
3249 }
3250 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3251 }
3252
3253 // Change the default value for flags which have different default values
3254 // when working with older JDKs.
3255 #ifdef LINUX
3256 if (JDK_Version::current().compare_major(6) <= 0 &&
3257 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3258 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3259 }
3260 #endif // LINUX
3261 fix_appclasspath();
3262 return JNI_OK;
3263 }
3264
3265 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3266 // For java.base check for duplicate --patch-module options being specified on the command line.
3267 // This check is only required for java.base, all other duplicate module specifications
3268 // will be checked during module system initialization. The module system initialization
3269 // will throw an ExceptionInInitializerError if this situation occurs.
3270 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3271 if (*patch_mod_javabase) {
3272 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3273 } else {
3274 *patch_mod_javabase = true;
3275 }
3276 }
3277
3278 // Create GrowableArray lazily, only if --patch-module has been specified
3279 if (_patch_mod_prefix == NULL) {
3280 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3281 }
3282
3283 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3284 }
3285
3286 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3287 //
3288 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3289 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3290 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3291 // path is treated as the current directory.
3292 //
3293 // This causes problems with CDS, which requires that all directories specified in the classpath
3294 // must be empty. In most cases, applications do NOT want to load classes from the current
3295 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3296 // scripts compatible with CDS.
3297 void Arguments::fix_appclasspath() {
3298 if (IgnoreEmptyClassPaths) {
3299 const char separator = *os::path_separator();
3300 const char* src = _java_class_path->value();
3301
3302 // skip over all the leading empty paths
3303 while (*src == separator) {
3304 src ++;
3305 }
3306
3307 char* copy = os::strdup_check_oom(src, mtArguments);
3308
3309 // trim all trailing empty paths
3310 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3311 *tail = '\0';
3312 }
3313
3314 char from[3] = {separator, separator, '\0'};
3315 char to [2] = {separator, '\0'};
3316 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3317 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3318 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3319 }
3320
3321 _java_class_path->set_writeable_value(copy);
3322 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3323 }
3324 }
3325
3326 static bool has_jar_files(const char* directory) {
3327 DIR* dir = os::opendir(directory);
3328 if (dir == NULL) return false;
3329
3330 struct dirent *entry;
3331 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3332 bool hasJarFile = false;
3333 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3334 const char* name = entry->d_name;
3335 const char* ext = name + strlen(name) - 4;
3336 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3337 }
3338 FREE_C_HEAP_ARRAY(char, dbuf);
3339 os::closedir(dir);
3340 return hasJarFile ;
3341 }
3342
3343 static int check_non_empty_dirs(const char* path) {
3344 const char separator = *os::path_separator();
3345 const char* const end = path + strlen(path);
3346 int nonEmptyDirs = 0;
3347 while (path < end) {
3348 const char* tmp_end = strchr(path, separator);
3349 if (tmp_end == NULL) {
3350 if (has_jar_files(path)) {
3351 nonEmptyDirs++;
3352 jio_fprintf(defaultStream::output_stream(),
3353 "Non-empty directory: %s\n", path);
3354 }
3355 path = end;
3356 } else {
3357 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3358 memcpy(dirpath, path, tmp_end - path);
3359 dirpath[tmp_end - path] = '\0';
3360 if (has_jar_files(dirpath)) {
3361 nonEmptyDirs++;
3362 jio_fprintf(defaultStream::output_stream(),
3363 "Non-empty directory: %s\n", dirpath);
3364 }
3365 FREE_C_HEAP_ARRAY(char, dirpath);
3366 path = tmp_end + 1;
3367 }
3368 }
3369 return nonEmptyDirs;
3370 }
3371
3372 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3373 // check if the default lib/endorsed directory exists; if so, error
3374 char path[JVM_MAXPATHLEN];
3375 const char* fileSep = os::file_separator();
3376 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3377
3378 if (CheckEndorsedAndExtDirs) {
3379 int nonEmptyDirs = 0;
3380 // check endorsed directory
3381 nonEmptyDirs += check_non_empty_dirs(path);
3382 // check the extension directories
3383 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3384 if (nonEmptyDirs > 0) {
3385 return JNI_ERR;
3386 }
3387 }
3388
3389 DIR* dir = os::opendir(path);
3390 if (dir != NULL) {
3391 jio_fprintf(defaultStream::output_stream(),
3392 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3393 "in modular form will be supported via the concept of upgradeable modules.\n");
3394 os::closedir(dir);
3395 return JNI_ERR;
3396 }
3397
3398 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3399 dir = os::opendir(path);
3400 if (dir != NULL) {
3401 jio_fprintf(defaultStream::output_stream(),
3402 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3403 "Use -classpath instead.\n.");
3404 os::closedir(dir);
3405 return JNI_ERR;
3406 }
3407
3408 // This must be done after all arguments have been processed
3409 // and the container support has been initialized since AggressiveHeap
3410 // relies on the amount of total memory available.
3411 if (AggressiveHeap) {
3412 jint result = set_aggressive_heap_flags();
3413 if (result != JNI_OK) {
3414 return result;
3415 }
3416 }
3417
3418 // This must be done after all arguments have been processed.
3419 // java_compiler() true means set to "NONE" or empty.
3420 if (java_compiler() && !xdebug_mode()) {
3421 // For backwards compatibility, we switch to interpreted mode if
3422 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3423 // not specified.
3424 set_mode_flags(_int);
3425 }
3426
3427 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3428 // but like -Xint, leave compilation thresholds unaffected.
3429 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3430 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3431 set_mode_flags(_int);
3432 }
3433
3434 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3435 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3436 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3437 }
3438
3439 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3440 // Don't degrade server performance for footprint
3441 if (FLAG_IS_DEFAULT(UseLargePages) &&
3442 MaxHeapSize < LargePageHeapSizeThreshold) {
3443 // No need for large granularity pages w/small heaps.
3444 // Note that large pages are enabled/disabled for both the
3445 // Java heap and the code cache.
3446 FLAG_SET_DEFAULT(UseLargePages, false);
3447 }
3448
3449 #elif defined(COMPILER2)
3450 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3451 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3452 }
3453 #endif
3454
3455 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3456 UNSUPPORTED_OPTION(ProfileInterpreter);
3457 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3458 #endif
3459
3460 #ifndef TIERED
3461 // Tiered compilation is undefined.
3462 UNSUPPORTED_OPTION(TieredCompilation);
3463 #endif
3464
3465 #if INCLUDE_JVMCI
3466 if (EnableJVMCI &&
3467 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3468 return JNI_ENOMEM;
3469 }
3470 #endif
3471
3472 // If we are running in a headless jre, force java.awt.headless property
3473 // to be true unless the property has already been set.
3474 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3475 if (os::is_headless_jre()) {
3476 const char* headless = Arguments::get_property("java.awt.headless");
3477 if (headless == NULL) {
3478 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3479 if (headless_env == NULL) {
3480 if (!add_property("java.awt.headless=true")) {
3481 return JNI_ENOMEM;
3482 }
3483 } else {
3484 char buffer[256];
3485 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3486 if (!add_property(buffer)) {
3487 return JNI_ENOMEM;
3488 }
3489 }
3490 }
3491 }
3492
3493 if (!check_vm_args_consistency()) {
3494 return JNI_ERR;
3495 }
3496
3497 #if INCLUDE_JVMCI
3498 if (UseJVMCICompiler) {
3499 Compilation_mode = CompMode_server;
3500 }
3501 #endif
3502
3503 #if INCLUDE_CDS
3504 if (DumpSharedSpaces) {
3505 // Disable biased locking now as it interferes with the clean up of
3506 // the archived Klasses and Java string objects (at dump time only).
3507 UseBiasedLocking = false;
3508 }
3509 if (UseSharedSpaces && patch_mod_javabase) {
3510 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3511 }
3512 #endif
3513
3514 return JNI_OK;
3515 }
3516
3517 // Helper class for controlling the lifetime of JavaVMInitArgs
3518 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3519 // deleted on the destruction of the ScopedVMInitArgs object.
3520 class ScopedVMInitArgs : public StackObj {
3521 private:
3522 JavaVMInitArgs _args;
3523 char* _container_name;
3524 bool _is_set;
3525 char* _vm_options_file_arg;
3526
3527 public:
3528 ScopedVMInitArgs(const char *container_name) {
3529 _args.version = JNI_VERSION_1_2;
3530 _args.nOptions = 0;
3531 _args.options = NULL;
3532 _args.ignoreUnrecognized = false;
3533 _container_name = (char *)container_name;
3534 _is_set = false;
3535 _vm_options_file_arg = NULL;
3536 }
3537
3538 // Populates the JavaVMInitArgs object represented by this
3539 // ScopedVMInitArgs object with the arguments in options. The
3540 // allocated memory is deleted by the destructor. If this method
3541 // returns anything other than JNI_OK, then this object is in a
3542 // partially constructed state, and should be abandoned.
3543 jint set_args(GrowableArray<JavaVMOption>* options) {
3544 _is_set = true;
3545 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3546 JavaVMOption, options->length(), mtArguments);
3547 if (options_arr == NULL) {
3548 return JNI_ENOMEM;
3549 }
3550 _args.options = options_arr;
3551
3552 for (int i = 0; i < options->length(); i++) {
3553 options_arr[i] = options->at(i);
3554 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3555 if (options_arr[i].optionString == NULL) {
3556 // Rely on the destructor to do cleanup.
3557 _args.nOptions = i;
3558 return JNI_ENOMEM;
3559 }
3560 }
3561
3562 _args.nOptions = options->length();
3563 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3564 return JNI_OK;
3565 }
3566
3567 JavaVMInitArgs* get() { return &_args; }
3568 char* container_name() { return _container_name; }
3569 bool is_set() { return _is_set; }
3570 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3571 char* vm_options_file_arg() { return _vm_options_file_arg; }
3572
3573 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3574 if (_vm_options_file_arg != NULL) {
3575 os::free(_vm_options_file_arg);
3576 }
3577 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3578 }
3579
3580 ~ScopedVMInitArgs() {
3581 if (_vm_options_file_arg != NULL) {
3582 os::free(_vm_options_file_arg);
3583 }
3584 if (_args.options == NULL) return;
3585 for (int i = 0; i < _args.nOptions; i++) {
3586 os::free(_args.options[i].optionString);
3587 }
3588 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3589 }
3590
3591 // Insert options into this option list, to replace option at
3592 // vm_options_file_pos (-XX:VMOptionsFile)
3593 jint insert(const JavaVMInitArgs* args,
3594 const JavaVMInitArgs* args_to_insert,
3595 const int vm_options_file_pos) {
3596 assert(_args.options == NULL, "shouldn't be set yet");
3597 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3598 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3599
3600 int length = args->nOptions + args_to_insert->nOptions - 1;
3601 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3602 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3603 for (int i = 0; i < args->nOptions; i++) {
3604 if (i == vm_options_file_pos) {
3605 // insert the new options starting at the same place as the
3606 // -XX:VMOptionsFile option
3607 for (int j = 0; j < args_to_insert->nOptions; j++) {
3608 options->push(args_to_insert->options[j]);
3609 }
3610 } else {
3611 options->push(args->options[i]);
3612 }
3613 }
3614 // make into options array
3615 jint result = set_args(options);
3616 delete options;
3617 return result;
3618 }
3619 };
3620
3621 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3622 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3623 }
3624
3625 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3626 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3627 }
3628
3629 jint Arguments::parse_options_environment_variable(const char* name,
3630 ScopedVMInitArgs* vm_args) {
3631 char *buffer = ::getenv(name);
3632
3633 // Don't check this environment variable if user has special privileges
3634 // (e.g. unix su command).
3635 if (buffer == NULL || os::have_special_privileges()) {
3636 return JNI_OK;
3637 }
3638
3639 if ((buffer = os::strdup(buffer)) == NULL) {
3640 return JNI_ENOMEM;
3641 }
3642
3643 jio_fprintf(defaultStream::error_stream(),
3644 "Picked up %s: %s\n", name, buffer);
3645
3646 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3647
3648 os::free(buffer);
3649 return retcode;
3650 }
3651
3652 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3653 // read file into buffer
3654 int fd = ::open(file_name, O_RDONLY);
3655 if (fd < 0) {
3656 jio_fprintf(defaultStream::error_stream(),
3657 "Could not open options file '%s'\n",
3658 file_name);
3659 return JNI_ERR;
3660 }
3661
3662 struct stat stbuf;
3663 int retcode = os::stat(file_name, &stbuf);
3664 if (retcode != 0) {
3665 jio_fprintf(defaultStream::error_stream(),
3666 "Could not stat options file '%s'\n",
3667 file_name);
3668 os::close(fd);
3669 return JNI_ERR;
3670 }
3671
3672 if (stbuf.st_size == 0) {
3673 // tell caller there is no option data and that is ok
3674 os::close(fd);
3675 return JNI_OK;
3676 }
3677
3678 // '+ 1' for NULL termination even with max bytes
3679 size_t bytes_alloc = stbuf.st_size + 1;
3680
3681 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3682 if (NULL == buf) {
3683 jio_fprintf(defaultStream::error_stream(),
3684 "Could not allocate read buffer for options file parse\n");
3685 os::close(fd);
3686 return JNI_ENOMEM;
3687 }
3688
3689 memset(buf, 0, bytes_alloc);
3690
3691 // Fill buffer
3692 // Use ::read() instead of os::read because os::read()
3693 // might do a thread state transition
3694 // and it is too early for that here
3695
3696 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3697 os::close(fd);
3698 if (bytes_read < 0) {
3699 FREE_C_HEAP_ARRAY(char, buf);
3700 jio_fprintf(defaultStream::error_stream(),
3701 "Could not read options file '%s'\n", file_name);
3702 return JNI_ERR;
3703 }
3704
3705 if (bytes_read == 0) {
3706 // tell caller there is no option data and that is ok
3707 FREE_C_HEAP_ARRAY(char, buf);
3708 return JNI_OK;
3709 }
3710
3711 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3712
3713 FREE_C_HEAP_ARRAY(char, buf);
3714 return retcode;
3715 }
3716
3717 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3718 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3719
3720 // some pointers to help with parsing
3721 char *buffer_end = buffer + buf_len;
3722 char *opt_hd = buffer;
3723 char *wrt = buffer;
3724 char *rd = buffer;
3725
3726 // parse all options
3727 while (rd < buffer_end) {
3728 // skip leading white space from the input string
3729 while (rd < buffer_end && isspace(*rd)) {
3730 rd++;
3731 }
3732
3733 if (rd >= buffer_end) {
3734 break;
3735 }
3736
3737 // Remember this is where we found the head of the token.
3738 opt_hd = wrt;
3739
3740 // Tokens are strings of non white space characters separated
3741 // by one or more white spaces.
3742 while (rd < buffer_end && !isspace(*rd)) {
3743 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3744 int quote = *rd; // matching quote to look for
3745 rd++; // don't copy open quote
3746 while (rd < buffer_end && *rd != quote) {
3747 // include everything (even spaces)
3748 // up until the close quote
3749 *wrt++ = *rd++; // copy to option string
3750 }
3751
3752 if (rd < buffer_end) {
3753 rd++; // don't copy close quote
3754 } else {
3755 // did not see closing quote
3756 jio_fprintf(defaultStream::error_stream(),
3757 "Unmatched quote in %s\n", name);
3758 delete options;
3759 return JNI_ERR;
3760 }
3761 } else {
3762 *wrt++ = *rd++; // copy to option string
3763 }
3764 }
3765
3766 // steal a white space character and set it to NULL
3767 *wrt++ = '\0';
3768 // We now have a complete token
3769
3770 JavaVMOption option;
3771 option.optionString = opt_hd;
3772 option.extraInfo = NULL;
3773
3774 options->append(option); // Fill in option
3775
3776 rd++; // Advance to next character
3777 }
3778
3779 // Fill out JavaVMInitArgs structure.
3780 jint status = vm_args->set_args(options);
3781
3782 delete options;
3783 return status;
3784 }
3785
3786 void Arguments::set_shared_spaces_flags() {
3787 if (DumpSharedSpaces) {
3788 if (FailOverToOldVerifier) {
3789 // Don't fall back to the old verifier on verification failure. If a
3790 // class fails verification with the split verifier, it might fail the
3791 // CDS runtime verifier constraint check. In that case, we don't want
3792 // to share the class. We only archive classes that pass the split verifier.
3793 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3794 }
3795
3796 if (RequireSharedSpaces) {
3797 warning("Cannot dump shared archive while using shared archive");
3798 }
3799 UseSharedSpaces = false;
3800 #ifdef _LP64
3801 if (!UseCompressedOops || !UseCompressedClassPointers) {
3802 vm_exit_during_initialization(
3803 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3804 }
3805 } else {
3806 if (!UseCompressedOops || !UseCompressedClassPointers) {
3807 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3808 }
3809 #endif
3810 }
3811 }
3812
3813 // Sharing support
3814 // Construct the path to the archive
3815 static char* get_shared_archive_path() {
3816 char *shared_archive_path;
3817 if (SharedArchiveFile == NULL) {
3818 char jvm_path[JVM_MAXPATHLEN];
3819 os::jvm_path(jvm_path, sizeof(jvm_path));
3820 char *end = strrchr(jvm_path, *os::file_separator());
3821 if (end != NULL) *end = '\0';
3822 size_t jvm_path_len = strlen(jvm_path);
3823 size_t file_sep_len = strlen(os::file_separator());
3824 const size_t len = jvm_path_len + file_sep_len + 20;
3825 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3826 if (shared_archive_path != NULL) {
3827 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3828 jvm_path, os::file_separator());
3829 }
3830 } else {
3831 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3832 }
3833 return shared_archive_path;
3834 }
3835
3836 #ifndef PRODUCT
3837 // Determine whether LogVMOutput should be implicitly turned on.
3838 static bool use_vm_log() {
3839 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3840 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3841 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3842 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3843 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3844 return true;
3845 }
3846
3847 #ifdef COMPILER1
3848 if (PrintC1Statistics) {
3849 return true;
3850 }
3851 #endif // COMPILER1
3852
3853 #ifdef COMPILER2
3854 if (PrintOptoAssembly || PrintOptoStatistics) {
3855 return true;
3856 }
3857 #endif // COMPILER2
3858
3859 return false;
3860 }
3861
3862 #endif // PRODUCT
3863
3864 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3865 for (int index = 0; index < args->nOptions; index++) {
3866 const JavaVMOption* option = args->options + index;
3867 const char* tail;
3868 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3869 return true;
3870 }
3871 }
3872 return false;
3873 }
3874
3875 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3876 const char* vm_options_file,
3877 const int vm_options_file_pos,
3878 ScopedVMInitArgs* vm_options_file_args,
3879 ScopedVMInitArgs* args_out) {
3880 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3881 if (code != JNI_OK) {
3882 return code;
3883 }
3884
3885 if (vm_options_file_args->get()->nOptions < 1) {
3886 return JNI_OK;
3887 }
3888
3889 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3890 jio_fprintf(defaultStream::error_stream(),
3891 "A VM options file may not refer to a VM options file. "
3892 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3893 "options file '%s' in options container '%s' is an error.\n",
3894 vm_options_file_args->vm_options_file_arg(),
3895 vm_options_file_args->container_name());
3896 return JNI_EINVAL;
3897 }
3898
3899 return args_out->insert(args, vm_options_file_args->get(),
3900 vm_options_file_pos);
3901 }
3902
3903 // Expand -XX:VMOptionsFile found in args_in as needed.
3904 // mod_args and args_out parameters may return values as needed.
3905 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3906 ScopedVMInitArgs* mod_args,
3907 JavaVMInitArgs** args_out) {
3908 jint code = match_special_option_and_act(args_in, mod_args);
3909 if (code != JNI_OK) {
3910 return code;
3911 }
3912
3913 if (mod_args->is_set()) {
3914 // args_in contains -XX:VMOptionsFile and mod_args contains the
3915 // original options from args_in along with the options expanded
3916 // from the VMOptionsFile. Return a short-hand to the caller.
3917 *args_out = mod_args->get();
3918 } else {
3919 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3920 }
3921 return JNI_OK;
3922 }
3923
3924 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3925 ScopedVMInitArgs* args_out) {
3926 // Remaining part of option string
3927 const char* tail;
3928 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3929
3930 for (int index = 0; index < args->nOptions; index++) {
3931 const JavaVMOption* option = args->options + index;
3932 if (ArgumentsExt::process_options(option)) {
3933 continue;
3934 }
3935 if (match_option(option, "-XX:Flags=", &tail)) {
3936 Arguments::set_jvm_flags_file(tail);
3937 continue;
3938 }
3939 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3940 if (vm_options_file_args.found_vm_options_file_arg()) {
3941 jio_fprintf(defaultStream::error_stream(),
3942 "The option '%s' is already specified in the options "
3943 "container '%s' so the specification of '%s' in the "
3944 "same options container is an error.\n",
3945 vm_options_file_args.vm_options_file_arg(),
3946 vm_options_file_args.container_name(),
3947 option->optionString);
3948 return JNI_EINVAL;
3949 }
3950 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3951 // If there's a VMOptionsFile, parse that
3952 jint code = insert_vm_options_file(args, tail, index,
3953 &vm_options_file_args, args_out);
3954 if (code != JNI_OK) {
3955 return code;
3956 }
3957 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3958 if (args_out->is_set()) {
3959 // The VMOptions file inserted some options so switch 'args'
3960 // to the new set of options, and continue processing which
3961 // preserves "last option wins" semantics.
3962 args = args_out->get();
3963 // The first option from the VMOptionsFile replaces the
3964 // current option. So we back track to process the
3965 // replacement option.
3966 index--;
3967 }
3968 continue;
3969 }
3970 if (match_option(option, "-XX:+PrintVMOptions")) {
3971 PrintVMOptions = true;
3972 continue;
3973 }
3974 if (match_option(option, "-XX:-PrintVMOptions")) {
3975 PrintVMOptions = false;
3976 continue;
3977 }
3978 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3979 IgnoreUnrecognizedVMOptions = true;
3980 continue;
3981 }
3982 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3983 IgnoreUnrecognizedVMOptions = false;
3984 continue;
3985 }
3986 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3987 CommandLineFlags::printFlags(tty, false);
3988 vm_exit(0);
3989 }
3990 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3991 #if INCLUDE_NMT
3992 // The launcher did not setup nmt environment variable properly.
3993 if (!MemTracker::check_launcher_nmt_support(tail)) {
3994 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3995 }
3996
3997 // Verify if nmt option is valid.
3998 if (MemTracker::verify_nmt_option()) {
3999 // Late initialization, still in single-threaded mode.
4000 if (MemTracker::tracking_level() >= NMT_summary) {
4001 MemTracker::init();
4002 }
4003 } else {
4004 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4005 }
4006 continue;
4007 #else
4008 jio_fprintf(defaultStream::error_stream(),
4009 "Native Memory Tracking is not supported in this VM\n");
4010 return JNI_ERR;
4011 #endif
4012 }
4013
4014 #ifndef PRODUCT
4015 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4016 CommandLineFlags::printFlags(tty, true);
4017 vm_exit(0);
4018 }
4019 #endif
4020
4021 if (match_option(option, "-XX:+UseAppCDS")) {
4022 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4023 if (flag->is_diagnostic()) {
4024 flag->clear_diagnostic();
4025 }
4026 continue;
4027 }
4028 }
4029 return JNI_OK;
4030 }
4031
4032 static void print_options(const JavaVMInitArgs *args) {
4033 const char* tail;
4034 for (int index = 0; index < args->nOptions; index++) {
4035 const JavaVMOption *option = args->options + index;
4036 if (match_option(option, "-XX:", &tail)) {
4037 logOption(tail);
4038 }
4039 }
4040 }
4041
4042 bool Arguments::handle_deprecated_print_gc_flags() {
4043 if (PrintGC) {
4044 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4045 }
4046 if (PrintGCDetails) {
4047 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4048 }
4049
4050 if (_gc_log_filename != NULL) {
4051 // -Xloggc was used to specify a filename
4052 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4053
4054 LogTarget(Error, logging) target;
4055 LogStream errstream(target);
4056 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4057 } else if (PrintGC || PrintGCDetails) {
4058 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4059 }
4060 return true;
4061 }
4062
4063 void Arguments::handle_extra_cms_flags(const char* msg) {
4064 SpecialFlag flag;
4065 const char *flag_name = "UseConcMarkSweepGC";
4066 if (lookup_special_flag(flag_name, flag)) {
4067 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4068 warning("%s", msg);
4069 }
4070 }
4071
4072 // Parse entry point called from JNI_CreateJavaVM
4073
4074 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4075 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4076
4077 // Initialize ranges, constraints and writeables
4078 CommandLineFlagRangeList::init();
4079 CommandLineFlagConstraintList::init();
4080 CommandLineFlagWriteableList::init();
4081
4082 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4083 const char* hotspotrc = ".hotspotrc";
4084 bool settings_file_specified = false;
4085 bool needs_hotspotrc_warning = false;
4086 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4087 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4088
4089 // Pointers to current working set of containers
4090 JavaVMInitArgs* cur_cmd_args;
4091 JavaVMInitArgs* cur_java_options_args;
4092 JavaVMInitArgs* cur_java_tool_options_args;
4093
4094 // Containers for modified/expanded options
4095 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4096 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4097 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4098
4099
4100 jint code =
4101 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4102 if (code != JNI_OK) {
4103 return code;
4104 }
4105
4106 code = parse_java_options_environment_variable(&initial_java_options_args);
4107 if (code != JNI_OK) {
4108 return code;
4109 }
4110
4111 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4112 &mod_java_tool_options_args,
4113 &cur_java_tool_options_args);
4114 if (code != JNI_OK) {
4115 return code;
4116 }
4117
4118 code = expand_vm_options_as_needed(initial_cmd_args,
4119 &mod_cmd_args,
4120 &cur_cmd_args);
4121 if (code != JNI_OK) {
4122 return code;
4123 }
4124
4125 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4126 &mod_java_options_args,
4127 &cur_java_options_args);
4128 if (code != JNI_OK) {
4129 return code;
4130 }
4131
4132 const char* flags_file = Arguments::get_jvm_flags_file();
4133 settings_file_specified = (flags_file != NULL);
4134
4135 if (IgnoreUnrecognizedVMOptions) {
4136 cur_cmd_args->ignoreUnrecognized = true;
4137 cur_java_tool_options_args->ignoreUnrecognized = true;
4138 cur_java_options_args->ignoreUnrecognized = true;
4139 }
4140
4141 // Parse specified settings file
4142 if (settings_file_specified) {
4143 if (!process_settings_file(flags_file, true,
4144 cur_cmd_args->ignoreUnrecognized)) {
4145 return JNI_EINVAL;
4146 }
4147 } else {
4148 #ifdef ASSERT
4149 // Parse default .hotspotrc settings file
4150 if (!process_settings_file(".hotspotrc", false,
4151 cur_cmd_args->ignoreUnrecognized)) {
4152 return JNI_EINVAL;
4153 }
4154 #else
4155 struct stat buf;
4156 if (os::stat(hotspotrc, &buf) == 0) {
4157 needs_hotspotrc_warning = true;
4158 }
4159 #endif
4160 }
4161
4162 if (PrintVMOptions) {
4163 print_options(cur_java_tool_options_args);
4164 print_options(cur_cmd_args);
4165 print_options(cur_java_options_args);
4166 }
4167
4168 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4169 jint result = parse_vm_init_args(cur_java_tool_options_args,
4170 cur_java_options_args,
4171 cur_cmd_args);
4172
4173 if (result != JNI_OK) {
4174 return result;
4175 }
4176
4177 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4178 SharedArchivePath = get_shared_archive_path();
4179 if (SharedArchivePath == NULL) {
4180 return JNI_ENOMEM;
4181 }
4182
4183 // Set up VerifySharedSpaces
4184 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4185 VerifySharedSpaces = true;
4186 }
4187
4188 // Delay warning until here so that we've had a chance to process
4189 // the -XX:-PrintWarnings flag
4190 if (needs_hotspotrc_warning) {
4191 warning("%s file is present but has been ignored. "
4192 "Run with -XX:Flags=%s to load the file.",
4193 hotspotrc, hotspotrc);
4194 }
4195
4196 if (needs_module_property_warning) {
4197 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4198 " names that are reserved for internal use.");
4199 }
4200
4201 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4202 UNSUPPORTED_OPTION(UseLargePages);
4203 #endif
4204
4205 ArgumentsExt::report_unsupported_options();
4206
4207 #ifndef PRODUCT
4208 if (TraceBytecodesAt != 0) {
4209 TraceBytecodes = true;
4210 }
4211 if (CountCompiledCalls) {
4212 if (UseCounterDecay) {
4213 warning("UseCounterDecay disabled because CountCalls is set");
4214 UseCounterDecay = false;
4215 }
4216 }
4217 #endif // PRODUCT
4218
4219 if (ScavengeRootsInCode == 0) {
4220 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4221 warning("Forcing ScavengeRootsInCode non-zero");
4222 }
4223 ScavengeRootsInCode = 1;
4224 }
4225
4226 if (!handle_deprecated_print_gc_flags()) {
4227 return JNI_EINVAL;
4228 }
4229
4230 // Set object alignment values.
4231 set_object_alignment();
4232
4233 #if !INCLUDE_CDS
4234 if (DumpSharedSpaces || RequireSharedSpaces) {
4235 jio_fprintf(defaultStream::error_stream(),
4236 "Shared spaces are not supported in this VM\n");
4237 return JNI_ERR;
4238 }
4239 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4240 log_is_enabled(Info, cds)) {
4241 warning("Shared spaces are not supported in this VM");
4242 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4243 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4244 }
4245 no_shared_spaces("CDS Disabled");
4246 #endif // INCLUDE_CDS
4247
4248 return JNI_OK;
4249 }
4250
4251 jint Arguments::apply_ergo() {
4252 // Set flags based on ergonomics.
4253 jint result = set_ergonomics_flags();
4254 if (result != JNI_OK) return result;
4255
4256 #if INCLUDE_JVMCI
4257 set_jvmci_specific_flags();
4258 #endif
4259
4260 set_shared_spaces_flags();
4261
4262 // Check the GC selections again.
4263 if (!check_gc_consistency()) {
4264 return JNI_EINVAL;
4265 }
4266
4267 if (TieredCompilation) {
4268 set_tiered_flags();
4269 } else {
4270 int max_compilation_policy_choice = 1;
4271 #ifdef COMPILER2
4272 if (is_server_compilation_mode_vm()) {
4273 max_compilation_policy_choice = 2;
4274 }
4275 #endif
4276 // Check if the policy is valid.
4277 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4278 vm_exit_during_initialization(
4279 "Incompatible compilation policy selected", NULL);
4280 }
4281 // Scale CompileThreshold
4282 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4283 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4284 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4285 }
4286 }
4287
4288 #ifdef COMPILER2
4289 #ifndef PRODUCT
4290 if (PrintIdealGraphLevel > 0) {
4291 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4292 }
4293 #endif
4294 #endif
4295
4296 // Set heap size based on available physical memory
4297 set_heap_size();
4298
4299 ArgumentsExt::set_gc_specific_flags();
4300
4301 // Initialize Metaspace flags and alignments
4302 Metaspace::ergo_initialize();
4303
4304 // Set bytecode rewriting flags
4305 set_bytecode_flags();
4306
4307 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4308 jint code = set_aggressive_opts_flags();
4309 if (code != JNI_OK) {
4310 return code;
4311 }
4312
4313 // Turn off biased locking for locking debug mode flags,
4314 // which are subtly different from each other but neither works with
4315 // biased locking
4316 if (UseHeavyMonitors
4317 #ifdef COMPILER1
4318 || !UseFastLocking
4319 #endif // COMPILER1
4320 #if INCLUDE_JVMCI
4321 || !JVMCIUseFastLocking
4322 #endif
4323 ) {
4324 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4325 // flag set to true on command line; warn the user that they
4326 // can't enable biased locking here
4327 warning("Biased Locking is not supported with locking debug flags"
4328 "; ignoring UseBiasedLocking flag." );
4329 }
4330 UseBiasedLocking = false;
4331 }
4332
4333 #ifdef CC_INTERP
4334 // Clear flags not supported on zero.
4335 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4336 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4337 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4338 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4339 #endif // CC_INTERP
4340
4341 #ifdef COMPILER2
4342 if (!EliminateLocks) {
4343 EliminateNestedLocks = false;
4344 }
4345 if (!Inline) {
4346 IncrementalInline = false;
4347 }
4348 #ifndef PRODUCT
4349 if (!IncrementalInline) {
4350 AlwaysIncrementalInline = false;
4351 }
4352 #endif
4353 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4354 // nothing to use the profiling, turn if off
4355 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4356 }
4357 #endif
4358
4359 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4360 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4361 DebugNonSafepoints = true;
4362 }
4363
4364 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4365 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4366 }
4367
4368 if (UseOnStackReplacement && !UseLoopCounter) {
4369 warning("On-stack-replacement requires loop counters; enabling loop counters");
4370 FLAG_SET_DEFAULT(UseLoopCounter, true);
4371 }
4372
4373 #ifndef PRODUCT
4374 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4375 if (use_vm_log()) {
4376 LogVMOutput = true;
4377 }
4378 }
4379 #endif // PRODUCT
4380
4381 if (PrintCommandLineFlags) {
4382 CommandLineFlags::printSetFlags(tty);
4383 }
4384
4385 // Apply CPU specific policy for the BiasedLocking
4386 if (UseBiasedLocking) {
4387 if (!VM_Version::use_biased_locking() &&
4388 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4389 UseBiasedLocking = false;
4390 }
4391 }
4392 #ifdef COMPILER2
4393 if (!UseBiasedLocking || EmitSync != 0) {
4394 UseOptoBiasInlining = false;
4395 }
4396 #endif
4397
4398 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4399 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4400 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4401 } else {
4402 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4403 }
4404
4405 return JNI_OK;
4406 }
4407
4408 jint Arguments::adjust_after_os() {
4409 if (UseNUMA) {
4410 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4411 FLAG_SET_ERGO(bool, UseNUMA, false);
4412 } else if (UseParallelGC || UseParallelOldGC) {
4413 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4414 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4415 }
4416 }
4417 // UseNUMAInterleaving is set to ON for all collectors and
4418 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4419 // such as the parallel collector for Linux and Solaris will
4420 // interleave old gen and survivor spaces on top of NUMA
4421 // allocation policy for the eden space.
4422 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4423 // all platforms and ParallelGC on Windows will interleave all
4424 // of the heap spaces across NUMA nodes.
4425 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4426 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4427 }
4428 }
4429 return JNI_OK;
4430 }
4431
4432 int Arguments::PropertyList_count(SystemProperty* pl) {
4433 int count = 0;
4434 while(pl != NULL) {
4435 count++;
4436 pl = pl->next();
4437 }
4438 return count;
4439 }
4440
4441 // Return the number of readable properties.
4442 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4443 int count = 0;
4444 while(pl != NULL) {
4445 if (pl->is_readable()) {
4446 count++;
4447 }
4448 pl = pl->next();
4449 }
4450 return count;
4451 }
4452
4453 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4454 assert(key != NULL, "just checking");
4455 SystemProperty* prop;
4456 for (prop = pl; prop != NULL; prop = prop->next()) {
4457 if (strcmp(key, prop->key()) == 0) return prop->value();
4458 }
4459 return NULL;
4460 }
4461
4462 // Return the value of the requested property provided that it is a readable property.
4463 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4464 assert(key != NULL, "just checking");
4465 SystemProperty* prop;
4466 // Return the property value if the keys match and the property is not internal or
4467 // it's the special internal property "jdk.boot.class.path.append".
4468 for (prop = pl; prop != NULL; prop = prop->next()) {
4469 if (strcmp(key, prop->key()) == 0) {
4470 if (!prop->internal()) {
4471 return prop->value();
4472 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4473 return prop->value();
4474 } else {
4475 // Property is internal and not jdk.boot.class.path.append so return NULL.
4476 return NULL;
4477 }
4478 }
4479 }
4480 return NULL;
4481 }
4482
4483 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4484 int count = 0;
4485 const char* ret_val = NULL;
4486
4487 while(pl != NULL) {
4488 if(count >= index) {
4489 ret_val = pl->key();
4490 break;
4491 }
4492 count++;
4493 pl = pl->next();
4494 }
4495
4496 return ret_val;
4497 }
4498
4499 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4500 int count = 0;
4501 char* ret_val = NULL;
4502
4503 while(pl != NULL) {
4504 if(count >= index) {
4505 ret_val = pl->value();
4506 break;
4507 }
4508 count++;
4509 pl = pl->next();
4510 }
4511
4512 return ret_val;
4513 }
4514
4515 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4516 SystemProperty* p = *plist;
4517 if (p == NULL) {
4518 *plist = new_p;
4519 } else {
4520 while (p->next() != NULL) {
4521 p = p->next();
4522 }
4523 p->set_next(new_p);
4524 }
4525 }
4526
4527 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4528 bool writeable, bool internal) {
4529 if (plist == NULL)
4530 return;
4531
4532 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4533 PropertyList_add(plist, new_p);
4534 }
4535
4536 void Arguments::PropertyList_add(SystemProperty *element) {
4537 PropertyList_add(&_system_properties, element);
4538 }
4539
4540 // This add maintains unique property key in the list.
4541 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4542 PropertyAppendable append, PropertyWriteable writeable,
4543 PropertyInternal internal) {
4544 if (plist == NULL)
4545 return;
4546
4547 // If property key exist then update with new value.
4548 SystemProperty* prop;
4549 for (prop = *plist; prop != NULL; prop = prop->next()) {
4550 if (strcmp(k, prop->key()) == 0) {
4551 if (append == AppendProperty) {
4552 prop->append_value(v);
4553 } else {
4554 prop->set_value(v);
4555 }
4556 return;
4557 }
4558 }
4559
4560 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4561 }
4562
4563 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4564 // Returns true if all of the source pointed by src has been copied over to
4565 // the destination buffer pointed by buf. Otherwise, returns false.
4566 // Notes:
4567 // 1. If the length (buflen) of the destination buffer excluding the
4568 // NULL terminator character is not long enough for holding the expanded
4569 // pid characters, it also returns false instead of returning the partially
4570 // expanded one.
4571 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4572 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4573 char* buf, size_t buflen) {
4574 const char* p = src;
4575 char* b = buf;
4576 const char* src_end = &src[srclen];
4577 char* buf_end = &buf[buflen - 1];
4578
4579 while (p < src_end && b < buf_end) {
4580 if (*p == '%') {
4581 switch (*(++p)) {
4582 case '%': // "%%" ==> "%"
4583 *b++ = *p++;
4584 break;
4585 case 'p': { // "%p" ==> current process id
4586 // buf_end points to the character before the last character so
4587 // that we could write '\0' to the end of the buffer.
4588 size_t buf_sz = buf_end - b + 1;
4589 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4590
4591 // if jio_snprintf fails or the buffer is not long enough to hold
4592 // the expanded pid, returns false.
4593 if (ret < 0 || ret >= (int)buf_sz) {
4594 return false;
4595 } else {
4596 b += ret;
4597 assert(*b == '\0', "fail in copy_expand_pid");
4598 if (p == src_end && b == buf_end + 1) {
4599 // reach the end of the buffer.
4600 return true;
4601 }
4602 }
4603 p++;
4604 break;
4605 }
4606 default :
4607 *b++ = '%';
4608 }
4609 } else {
4610 *b++ = *p++;
4611 }
4612 }
4613 *b = '\0';
4614 return (p == src_end); // return false if not all of the source was copied
4615 }