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 success = false;
714 }
715 }
716 }
717
718 if (!flag.expired_in.is_undefined()) {
719 // if flag has become expired it should not have a "globals" flag defined anymore.
720 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
721 if (Flag::find_flag(flag.name) != NULL) {
722 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
723 success = false;
724 }
725 }
726 }
727
728 }
729 return success;
730 }
731 #endif
732
733 // Parses a size specification string.
734 bool Arguments::atojulong(const char *s, julong* result) {
735 julong n = 0;
736
737 // First char must be a digit. Don't allow negative numbers or leading spaces.
738 if (!isdigit(*s)) {
739 return false;
740 }
741
742 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
743 char* remainder;
744 errno = 0;
745 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
746 if (errno != 0) {
747 return false;
748 }
749
750 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
751 if (remainder == s || strlen(remainder) > 1) {
752 return false;
753 }
754
755 switch (*remainder) {
756 case 'T': case 't':
757 *result = n * G * K;
758 // Check for overflow.
759 if (*result/((julong)G * K) != n) return false;
760 return true;
761 case 'G': case 'g':
762 *result = n * G;
763 if (*result/G != n) return false;
764 return true;
765 case 'M': case 'm':
766 *result = n * M;
767 if (*result/M != n) return false;
768 return true;
769 case 'K': case 'k':
770 *result = n * K;
771 if (*result/K != n) return false;
772 return true;
773 case '\0':
774 *result = n;
775 return true;
776 default:
777 return false;
778 }
779 }
780
781 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
782 if (size < min_size) return arg_too_small;
783 if (size > max_size) return arg_too_big;
784 return arg_in_range;
785 }
786
787 // Describe an argument out of range error
788 void Arguments::describe_range_error(ArgsRange errcode) {
789 switch(errcode) {
790 case arg_too_big:
791 jio_fprintf(defaultStream::error_stream(),
792 "The specified size exceeds the maximum "
793 "representable size.\n");
794 break;
795 case arg_too_small:
796 case arg_unreadable:
797 case arg_in_range:
798 // do nothing for now
799 break;
800 default:
801 ShouldNotReachHere();
802 }
803 }
804
805 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
806 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
807 return true;
808 } else {
809 return false;
810 }
811 }
812
813 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
814 char* end;
815 errno = 0;
816 double v = strtod(value, &end);
817 if ((errno != 0) || (*end != 0)) {
818 return false;
819 }
820
821 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
822 return true;
823 }
824 return false;
825 }
826
827 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
828 julong v;
829 int int_v;
830 intx intx_v;
831 bool is_neg = false;
832 Flag* result = Flag::find_flag(name, strlen(name));
833
834 if (result == NULL) {
835 return false;
836 }
837
838 // Check the sign first since atojulong() parses only unsigned values.
839 if (*value == '-') {
840 if (!result->is_intx() && !result->is_int()) {
841 return false;
842 }
843 value++;
844 is_neg = true;
845 }
846 if (!Arguments::atojulong(value, &v)) {
847 return false;
848 }
849 if (result->is_int()) {
850 int_v = (int) v;
851 if (is_neg) {
852 int_v = -int_v;
853 }
854 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
855 } else if (result->is_uint()) {
856 uint uint_v = (uint) v;
857 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
858 } else if (result->is_intx()) {
859 intx_v = (intx) v;
860 if (is_neg) {
861 intx_v = -intx_v;
862 }
863 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
864 } else if (result->is_uintx()) {
865 uintx uintx_v = (uintx) v;
866 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
867 } else if (result->is_uint64_t()) {
868 uint64_t uint64_t_v = (uint64_t) v;
869 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
870 } else if (result->is_size_t()) {
871 size_t size_t_v = (size_t) v;
872 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
873 } else if (result->is_double()) {
874 double double_v = (double) v;
875 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
876 } else {
877 return false;
878 }
879 }
880
881 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
882 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
883 // Contract: CommandLineFlags always returns a pointer that needs freeing.
884 FREE_C_HEAP_ARRAY(char, value);
885 return true;
886 }
887
888 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
889 const char* old_value = "";
890 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
891 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
892 size_t new_len = strlen(new_value);
893 const char* value;
894 char* free_this_too = NULL;
895 if (old_len == 0) {
896 value = new_value;
897 } else if (new_len == 0) {
898 value = old_value;
899 } else {
900 size_t length = old_len + 1 + new_len + 1;
901 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
902 // each new setting adds another LINE to the switch:
903 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
904 value = buf;
905 free_this_too = buf;
906 }
907 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
908 // CommandLineFlags always returns a pointer that needs freeing.
909 FREE_C_HEAP_ARRAY(char, value);
910 if (free_this_too != NULL) {
911 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
912 FREE_C_HEAP_ARRAY(char, free_this_too);
913 }
914 return true;
915 }
916
917 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
918 const char* real_name = real_flag_name(arg);
919 JDK_Version since = JDK_Version();
920 switch (is_deprecated_flag(arg, &since)) {
921 case -1:
922 return NULL; // obsolete or expired, don't process normally
923 case 0:
924 return real_name;
925 case 1: {
926 if (warn) {
927 char version[256];
928 since.to_string(version, sizeof(version));
929 if (real_name != arg) {
930 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
931 arg, version, real_name);
932 } else {
933 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
934 arg, version);
935 }
936 }
937 return real_name;
938 }
939 }
940 ShouldNotReachHere();
941 return NULL;
942 }
943
944 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
945 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
946 // Set tagset string buffer at max size of 256, large enough for any alias tagset
947 const int max_tagset_size = 256;
948 int max_tagset_len = max_tagset_size - 1;
949 char tagset_buffer[max_tagset_size];
950 tagset_buffer[0] = '\0';
951
952 // Write tag-set for aliased logging option, in string list form
953 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
954 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
955 if (i > 0) {
956 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
957 }
958 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
959 }
960 if (!alf.exactMatch) {
961 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
962 }
963 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
964 (on) ? "+" : "-",
965 name,
966 tagset_buffer,
967 (on) ? LogLevel::name(alf.level) : "off");
968 }
969
970 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
971 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
972 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
973 if (strcmp(alf.alias_name, name) == 0) {
974 log_deprecated_flag(name, on, alf);
975 return alf;
976 }
977 }
978 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
979 return a;
980 }
981
982 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
983
984 // range of acceptable characters spelled out for portability reasons
985 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
986 #define BUFLEN 255
987 char name[BUFLEN+1];
988 char dummy;
989 const char* real_name;
990 bool warn_if_deprecated = true;
991
992 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
993 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
994 if (alf.alias_name != NULL){
995 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
996 return true;
997 }
998 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
999 if (real_name == NULL) {
1000 return false;
1001 }
1002 return set_bool_flag(real_name, false, origin);
1003 }
1004 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1005 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1006 if (alf.alias_name != NULL){
1007 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1008 return true;
1009 }
1010 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1011 if (real_name == NULL) {
1012 return false;
1013 }
1014 return set_bool_flag(real_name, true, origin);
1015 }
1016
1017 char punct;
1018 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1019 const char* value = strchr(arg, '=') + 1;
1020 Flag* flag;
1021
1022 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1023 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1024 if (alf.alias_name != NULL) {
1025 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1026 return true;
1027 }
1028 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1029 if (real_name == NULL) {
1030 return false;
1031 }
1032 flag = Flag::find_flag(real_name);
1033 if (flag != NULL && flag->is_ccstr()) {
1034 if (flag->ccstr_accumulates()) {
1035 return append_to_string_flag(real_name, value, origin);
1036 } else {
1037 if (value[0] == '\0') {
1038 value = NULL;
1039 }
1040 return set_string_flag(real_name, value, origin);
1041 }
1042 } else {
1043 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1044 }
1045 }
1046
1047 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1048 const char* value = strchr(arg, '=') + 1;
1049 // -XX:Foo:=xxx will reset the string flag to the given value.
1050 if (value[0] == '\0') {
1051 value = NULL;
1052 }
1053 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1054 if (real_name == NULL) {
1055 return false;
1056 }
1057 return set_string_flag(real_name, value, origin);
1058 }
1059
1060 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1061 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1062 #define NUMBER_RANGE "[0123456789eE+-]"
1063 char value[BUFLEN + 1];
1064 char value2[BUFLEN + 1];
1065 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1066 // Looks like a floating-point number -- try again with more lenient format string
1067 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1068 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1069 if (real_name == NULL) {
1070 return false;
1071 }
1072 return set_fp_numeric_flag(real_name, value, origin);
1073 }
1074 }
1075
1076 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1077 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1078 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1079 if (real_name == NULL) {
1080 return false;
1081 }
1082 return set_numeric_flag(real_name, value, origin);
1083 }
1084
1085 return false;
1086 }
1087
1088 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1089 assert(bldarray != NULL, "illegal argument");
1090
1091 if (arg == NULL) {
1092 return;
1093 }
1094
1095 int new_count = *count + 1;
1096
1097 // expand the array and add arg to the last element
1098 if (*bldarray == NULL) {
1099 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1100 } else {
1101 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1102 }
1103 (*bldarray)[*count] = os::strdup_check_oom(arg);
1104 *count = new_count;
1105 }
1106
1107 void Arguments::build_jvm_args(const char* arg) {
1108 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1109 }
1110
1111 void Arguments::build_jvm_flags(const char* arg) {
1112 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1113 }
1114
1115 // utility function to return a string that concatenates all
1116 // strings in a given char** array
1117 const char* Arguments::build_resource_string(char** args, int count) {
1118 if (args == NULL || count == 0) {
1119 return NULL;
1120 }
1121 size_t length = 0;
1122 for (int i = 0; i < count; i++) {
1123 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1124 }
1125 char* s = NEW_RESOURCE_ARRAY(char, length);
1126 char* dst = s;
1127 for (int j = 0; j < count; j++) {
1128 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1129 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1130 dst += offset;
1131 length -= offset;
1132 }
1133 return (const char*) s;
1134 }
1135
1136 void Arguments::print_on(outputStream* st) {
1137 st->print_cr("VM Arguments:");
1138 if (num_jvm_flags() > 0) {
1139 st->print("jvm_flags: "); print_jvm_flags_on(st);
1140 st->cr();
1141 }
1142 if (num_jvm_args() > 0) {
1143 st->print("jvm_args: "); print_jvm_args_on(st);
1144 st->cr();
1145 }
1146 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1147 if (_java_class_path != NULL) {
1148 char* path = _java_class_path->value();
1149 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1150 }
1151 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1152 }
1153
1154 void Arguments::print_summary_on(outputStream* st) {
1155 // Print the command line. Environment variables that are helpful for
1156 // reproducing the problem are written later in the hs_err file.
1157 // flags are from setting file
1158 if (num_jvm_flags() > 0) {
1159 st->print_raw("Settings File: ");
1160 print_jvm_flags_on(st);
1161 st->cr();
1162 }
1163 // args are the command line and environment variable arguments.
1164 st->print_raw("Command Line: ");
1165 if (num_jvm_args() > 0) {
1166 print_jvm_args_on(st);
1167 }
1168 // this is the classfile and any arguments to the java program
1169 if (java_command() != NULL) {
1170 st->print("%s", java_command());
1171 }
1172 st->cr();
1173 }
1174
1175 void Arguments::print_jvm_flags_on(outputStream* st) {
1176 if (_num_jvm_flags > 0) {
1177 for (int i=0; i < _num_jvm_flags; i++) {
1178 st->print("%s ", _jvm_flags_array[i]);
1179 }
1180 }
1181 }
1182
1183 void Arguments::print_jvm_args_on(outputStream* st) {
1184 if (_num_jvm_args > 0) {
1185 for (int i=0; i < _num_jvm_args; i++) {
1186 st->print("%s ", _jvm_args_array[i]);
1187 }
1188 }
1189 }
1190
1191 bool Arguments::process_argument(const char* arg,
1192 jboolean ignore_unrecognized,
1193 Flag::Flags origin) {
1194 JDK_Version since = JDK_Version();
1195
1196 if (parse_argument(arg, origin)) {
1197 return true;
1198 }
1199
1200 // Determine if the flag has '+', '-', or '=' characters.
1201 bool has_plus_minus = (*arg == '+' || *arg == '-');
1202 const char* const argname = has_plus_minus ? arg + 1 : arg;
1203
1204 size_t arg_len;
1205 const char* equal_sign = strchr(argname, '=');
1206 if (equal_sign == NULL) {
1207 arg_len = strlen(argname);
1208 } else {
1209 arg_len = equal_sign - argname;
1210 }
1211
1212 // Only make the obsolete check for valid arguments.
1213 if (arg_len <= BUFLEN) {
1214 // Construct a string which consists only of the argument name without '+', '-', or '='.
1215 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1216 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1217 if (is_obsolete_flag(stripped_argname, &since)) {
1218 char version[256];
1219 since.to_string(version, sizeof(version));
1220 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1221 return true;
1222 }
1223 #ifndef PRODUCT
1224 else {
1225 const char* replacement;
1226 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1227 log_warning(arguments)("%s has been removed. Please use %s instead.",
1228 stripped_argname,
1229 replacement);
1230 return false;
1231 }
1232 }
1233 #endif //PRODUCT
1234 }
1235
1236 // For locked flags, report a custom error message if available.
1237 // Otherwise, report the standard unrecognized VM option.
1238 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1239 if (found_flag != NULL) {
1240 char locked_message_buf[BUFLEN];
1241 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1242 if (strlen(locked_message_buf) == 0) {
1243 if (found_flag->is_bool() && !has_plus_minus) {
1244 jio_fprintf(defaultStream::error_stream(),
1245 "Missing +/- setting for VM option '%s'\n", argname);
1246 } else if (!found_flag->is_bool() && has_plus_minus) {
1247 jio_fprintf(defaultStream::error_stream(),
1248 "Unexpected +/- setting in VM option '%s'\n", argname);
1249 } else {
1250 jio_fprintf(defaultStream::error_stream(),
1251 "Improperly specified VM option '%s'\n", argname);
1252 }
1253 } else {
1254 #ifdef PRODUCT
1255 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1256 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1257 if (ignore_unrecognized && mismatched) {
1258 return true;
1259 }
1260 #endif
1261 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1262 }
1263 } else {
1264 if (ignore_unrecognized) {
1265 return true;
1266 }
1267 jio_fprintf(defaultStream::error_stream(),
1268 "Unrecognized VM option '%s'\n", argname);
1269 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1270 if (fuzzy_matched != NULL) {
1271 jio_fprintf(defaultStream::error_stream(),
1272 "Did you mean '%s%s%s'? ",
1273 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1274 fuzzy_matched->_name,
1275 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1276 }
1277 }
1278
1279 // allow for commandline "commenting out" options like -XX:#+Verbose
1280 return arg[0] == '#';
1281 }
1282
1283 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1284 FILE* stream = fopen(file_name, "rb");
1285 if (stream == NULL) {
1286 if (should_exist) {
1287 jio_fprintf(defaultStream::error_stream(),
1288 "Could not open settings file %s\n", file_name);
1289 return false;
1290 } else {
1291 return true;
1292 }
1293 }
1294
1295 char token[1024];
1296 int pos = 0;
1297
1298 bool in_white_space = true;
1299 bool in_comment = false;
1300 bool in_quote = false;
1301 char quote_c = 0;
1302 bool result = true;
1303
1304 int c = getc(stream);
1305 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1306 if (in_white_space) {
1307 if (in_comment) {
1308 if (c == '\n') in_comment = false;
1309 } else {
1310 if (c == '#') in_comment = true;
1311 else if (!isspace(c)) {
1312 in_white_space = false;
1313 token[pos++] = c;
1314 }
1315 }
1316 } else {
1317 if (c == '\n' || (!in_quote && isspace(c))) {
1318 // token ends at newline, or at unquoted whitespace
1319 // this allows a way to include spaces in string-valued options
1320 token[pos] = '\0';
1321 logOption(token);
1322 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1323 build_jvm_flags(token);
1324 pos = 0;
1325 in_white_space = true;
1326 in_quote = false;
1327 } else if (!in_quote && (c == '\'' || c == '"')) {
1328 in_quote = true;
1329 quote_c = c;
1330 } else if (in_quote && (c == quote_c)) {
1331 in_quote = false;
1332 } else {
1333 token[pos++] = c;
1334 }
1335 }
1336 c = getc(stream);
1337 }
1338 if (pos > 0) {
1339 token[pos] = '\0';
1340 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1341 build_jvm_flags(token);
1342 }
1343 fclose(stream);
1344 return result;
1345 }
1346
1347 //=============================================================================================================
1348 // Parsing of properties (-D)
1349
1350 const char* Arguments::get_property(const char* key) {
1351 return PropertyList_get_value(system_properties(), key);
1352 }
1353
1354 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1355 const char* eq = strchr(prop, '=');
1356 const char* key;
1357 const char* value = "";
1358
1359 if (eq == NULL) {
1360 // property doesn't have a value, thus use passed string
1361 key = prop;
1362 } else {
1363 // property have a value, thus extract it and save to the
1364 // allocated string
1365 size_t key_len = eq - prop;
1366 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1367
1368 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1369 key = tmp_key;
1370
1371 value = &prop[key_len + 1];
1372 }
1373
1374 if (strcmp(key, "java.compiler") == 0) {
1375 process_java_compiler_argument(value);
1376 // Record value in Arguments, but let it get passed to Java.
1377 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1378 strcmp(key, "sun.java.launcher.pid") == 0) {
1379 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1380 // private and are processed in process_sun_java_launcher_properties();
1381 // the sun.java.launcher property is passed on to the java application
1382 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1383 // append is true, writable is true, internal is false
1384 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1385 WriteableProperty, ExternalProperty);
1386 } else {
1387 if (strcmp(key, "sun.java.command") == 0) {
1388 char *old_java_command = _java_command;
1389 _java_command = os::strdup_check_oom(value, mtArguments);
1390 if (old_java_command != NULL) {
1391 os::free(old_java_command);
1392 }
1393 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1394 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1395 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1396 // its value without going through the property list or making a Java call.
1397 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1398 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1399 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1400 os::free((void *)old_java_vendor_url_bug);
1401 }
1402 }
1403
1404 // Create new property and add at the end of the list
1405 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1406 }
1407
1408 if (key != prop) {
1409 // SystemProperty copy passed value, thus free previously allocated
1410 // memory
1411 FreeHeap((void *)key);
1412 }
1413
1414 return true;
1415 }
1416
1417 #if INCLUDE_CDS
1418 void Arguments::check_unsupported_dumping_properties() {
1419 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1420 const char* unsupported_properties[] = { "jdk.module.main",
1421 "jdk.module.limitmods",
1422 "jdk.module.path",
1423 "jdk.module.upgrade.path",
1424 "jdk.module.patch.0" };
1425 const char* unsupported_options[] = { "-m", // cannot use at dump time
1426 "--limit-modules", // ignored at dump time
1427 "--module-path", // ignored at dump time
1428 "--upgrade-module-path", // ignored at dump time
1429 "--patch-module" // ignored at dump time
1430 };
1431 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1432 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1433 // vm will exit with an error message. Otherwise, it will print an informational message if
1434 // -Xlog:cds is enabled.
1435 uint info_idx = 1;
1436 SystemProperty* sp = system_properties();
1437 while (sp != NULL) {
1438 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1439 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1440 if (i < info_idx) {
1441 vm_exit_during_initialization(
1442 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1443 } else {
1444 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1445 unsupported_options[i]);
1446 }
1447 }
1448 }
1449 sp = sp->next();
1450 }
1451
1452 // Check for an exploded module build in use with -Xshare:dump.
1453 if (!has_jimage()) {
1454 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1455 }
1456 }
1457 #endif
1458
1459 //===========================================================================================================
1460 // Setting int/mixed/comp mode flags
1461
1462 void Arguments::set_mode_flags(Mode mode) {
1463 // Set up default values for all flags.
1464 // If you add a flag to any of the branches below,
1465 // add a default value for it here.
1466 set_java_compiler(false);
1467 _mode = mode;
1468
1469 // Ensure Agent_OnLoad has the correct initial values.
1470 // This may not be the final mode; mode may change later in onload phase.
1471 PropertyList_unique_add(&_system_properties, "java.vm.info",
1472 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1473
1474 UseInterpreter = true;
1475 UseCompiler = true;
1476 UseLoopCounter = true;
1477
1478 // Default values may be platform/compiler dependent -
1479 // use the saved values
1480 ClipInlining = Arguments::_ClipInlining;
1481 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1482 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1483 BackgroundCompilation = Arguments::_BackgroundCompilation;
1484 if (TieredCompilation) {
1485 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1486 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1487 }
1488 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1489 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1490 }
1491 }
1492
1493 // Change from defaults based on mode
1494 switch (mode) {
1495 default:
1496 ShouldNotReachHere();
1497 break;
1498 case _int:
1499 UseCompiler = false;
1500 UseLoopCounter = false;
1501 AlwaysCompileLoopMethods = false;
1502 UseOnStackReplacement = false;
1503 break;
1504 case _mixed:
1505 // same as default
1506 break;
1507 case _comp:
1508 UseInterpreter = false;
1509 BackgroundCompilation = false;
1510 ClipInlining = false;
1511 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1512 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1513 // compile a level 4 (C2) and then continue executing it.
1514 if (TieredCompilation) {
1515 Tier3InvokeNotifyFreqLog = 0;
1516 Tier4InvocationThreshold = 0;
1517 }
1518 break;
1519 }
1520 }
1521
1522 // Conflict: required to use shared spaces (-Xshare:on), but
1523 // incompatible command line options were chosen.
1524 static void no_shared_spaces(const char* message) {
1525 if (RequireSharedSpaces) {
1526 jio_fprintf(defaultStream::error_stream(),
1527 "Class data sharing is inconsistent with other specified options.\n");
1528 vm_exit_during_initialization("Unable to use shared archive.", message);
1529 } else {
1530 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1531 }
1532 }
1533
1534 // Returns threshold scaled with the value of scale.
1535 // If scale < 0.0, threshold is returned without scaling.
1536 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1537 if (scale == 1.0 || scale < 0.0) {
1538 return threshold;
1539 } else {
1540 return (intx)(threshold * scale);
1541 }
1542 }
1543
1544 // Returns freq_log scaled with the value of scale.
1545 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1546 // If scale < 0.0, freq_log is returned without scaling.
1547 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1548 // Check if scaling is necessary or if negative value was specified.
1549 if (scale == 1.0 || scale < 0.0) {
1550 return freq_log;
1551 }
1552 // Check values to avoid calculating log2 of 0.
1553 if (scale == 0.0 || freq_log == 0) {
1554 return 0;
1555 }
1556 // Determine the maximum notification frequency value currently supported.
1557 // The largest mask value that the interpreter/C1 can handle is
1558 // of length InvocationCounter::number_of_count_bits. Mask values are always
1559 // one bit shorter then the value of the notification frequency. Set
1560 // max_freq_bits accordingly.
1561 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1562 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1563 if (scaled_freq == 0) {
1564 // Return 0 right away to avoid calculating log2 of 0.
1565 return 0;
1566 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1567 return max_freq_bits;
1568 } else {
1569 return log2_intptr(scaled_freq);
1570 }
1571 }
1572
1573 void Arguments::set_tiered_flags() {
1574 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1575 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1576 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1577 }
1578 if (CompilationPolicyChoice < 2) {
1579 vm_exit_during_initialization(
1580 "Incompatible compilation policy selected", NULL);
1581 }
1582 // Increase the code cache size - tiered compiles a lot more.
1583 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1584 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1585 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1586 }
1587 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1588 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1589 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1590 }
1591 if (!UseInterpreter) { // -Xcomp
1592 Tier3InvokeNotifyFreqLog = 0;
1593 Tier4InvocationThreshold = 0;
1594 }
1595
1596 if (CompileThresholdScaling < 0) {
1597 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1598 }
1599
1600 // Scale tiered compilation thresholds.
1601 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1602 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1603 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1604 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1605
1606 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1607 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1608 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1609 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1610
1611 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1612 // once these thresholds become supported.
1613
1614 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1615 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1616
1617 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1618 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1619
1620 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1621
1622 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1623 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1624 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1625 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1626 }
1627 }
1628
1629 void set_object_alignment() {
1630 // Object alignment.
1631 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1632 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1633 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1634 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1635 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1636 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1637
1638 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1639 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1640
1641 // Oop encoding heap max
1642 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1643
1644 if (SurvivorAlignmentInBytes == 0) {
1645 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1646 }
1647 }
1648
1649 size_t Arguments::max_heap_for_compressed_oops() {
1650 // Avoid sign flip.
1651 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1652 // We need to fit both the NULL page and the heap into the memory budget, while
1653 // keeping alignment constraints of the heap. To guarantee the latter, as the
1654 // NULL page is located before the heap, we pad the NULL page to the conservative
1655 // maximum alignment that the GC may ever impose upon the heap.
1656 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1657 _conservative_max_heap_alignment);
1658
1659 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1660 NOT_LP64(ShouldNotReachHere(); return 0);
1661 }
1662
1663 void Arguments::set_use_compressed_oops() {
1664 #ifndef ZERO
1665 #ifdef _LP64
1666 // MaxHeapSize is not set up properly at this point, but
1667 // the only value that can override MaxHeapSize if we are
1668 // to use UseCompressedOops is InitialHeapSize.
1669 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1670
1671 if (max_heap_size <= max_heap_for_compressed_oops()) {
1672 #if !defined(COMPILER1) || defined(TIERED)
1673 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1674 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1675 }
1676 #endif
1677 } else {
1678 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1679 warning("Max heap size too large for Compressed Oops");
1680 FLAG_SET_DEFAULT(UseCompressedOops, false);
1681 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1682 }
1683 }
1684 #endif // _LP64
1685 #endif // ZERO
1686 }
1687
1688
1689 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1690 // set_use_compressed_oops().
1691 void Arguments::set_use_compressed_klass_ptrs() {
1692 #ifndef ZERO
1693 #ifdef _LP64
1694 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1695 if (!UseCompressedOops) {
1696 if (UseCompressedClassPointers) {
1697 warning("UseCompressedClassPointers requires UseCompressedOops");
1698 }
1699 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1700 } else {
1701 // Turn on UseCompressedClassPointers too
1702 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1703 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1704 }
1705 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1706 if (UseCompressedClassPointers) {
1707 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1708 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1709 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1710 }
1711 }
1712 }
1713 #endif // _LP64
1714 #endif // !ZERO
1715 }
1716
1717 void Arguments::set_conservative_max_heap_alignment() {
1718 // The conservative maximum required alignment for the heap is the maximum of
1719 // the alignments imposed by several sources: any requirements from the heap
1720 // itself, the collector policy and the maximum page size we may run the VM
1721 // with.
1722 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1723 _conservative_max_heap_alignment = MAX4(heap_alignment,
1724 (size_t)os::vm_allocation_granularity(),
1725 os::max_page_size(),
1726 CollectorPolicy::compute_heap_alignment());
1727 }
1728
1729 #ifdef TIERED
1730 bool Arguments::compilation_mode_selected() {
1731 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1732 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1733
1734 }
1735
1736 void Arguments::select_compilation_mode_ergonomically() {
1737 #if defined(_WINDOWS) && !defined(_LP64)
1738 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1739 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1740 }
1741 #endif
1742 if (NeverActAsServerClassMachine) {
1743 set_client_compilation_mode();
1744 }
1745 }
1746 #endif //TIERED
1747
1748 #if INCLUDE_JVMCI
1749 void Arguments::set_jvmci_specific_flags() {
1750 if (UseJVMCICompiler) {
1751 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1752 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1753 }
1754 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1755 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1756 }
1757 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1758 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1759 }
1760 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1761 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1762 }
1763 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1764 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1765 }
1766 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1767 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1768 }
1769 if (TieredStopAtLevel != CompLevel_full_optimization) {
1770 // Currently JVMCI compiler can only work at the full optimization level
1771 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1772 TieredStopAtLevel = CompLevel_full_optimization;
1773 }
1774 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1775 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1776 }
1777 }
1778 }
1779 #endif
1780
1781 jint Arguments::set_ergonomics_flags() {
1782 #ifdef TIERED
1783 if (!compilation_mode_selected()) {
1784 select_compilation_mode_ergonomically();
1785 }
1786 #endif
1787
1788 jint gc_result = GCArguments::initialize();
1789 if (gc_result != JNI_OK) {
1790 return gc_result;
1791 }
1792
1793 #if COMPILER2_OR_JVMCI
1794 // Shared spaces work fine with other GCs but causes bytecode rewriting
1795 // to be disabled, which hurts interpreter performance and decreases
1796 // server performance. When -server is specified, keep the default off
1797 // unless it is asked for. Future work: either add bytecode rewriting
1798 // at link time, or rewrite bytecodes in non-shared methods.
1799 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1800 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1801 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1802 }
1803 #endif
1804
1805 set_conservative_max_heap_alignment();
1806
1807 #ifndef ZERO
1808 #ifdef _LP64
1809 set_use_compressed_oops();
1810
1811 // set_use_compressed_klass_ptrs() must be called after calling
1812 // set_use_compressed_oops().
1813 set_use_compressed_klass_ptrs();
1814
1815 // Also checks that certain machines are slower with compressed oops
1816 // in vm_version initialization code.
1817 #endif // _LP64
1818 #endif // !ZERO
1819
1820 return JNI_OK;
1821 }
1822
1823 void Arguments::set_gc_specific_flags() {
1824 // Set GC flags
1825 GCArguments::arguments()->initialize_flags();
1826 }
1827
1828 julong Arguments::limit_by_allocatable_memory(julong limit) {
1829 julong max_allocatable;
1830 julong result = limit;
1831 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1832 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1833 }
1834 return result;
1835 }
1836
1837 // Use static initialization to get the default before parsing
1838 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1839
1840 void Arguments::set_heap_size() {
1841 julong phys_mem =
1842 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1843 : (julong)MaxRAM;
1844
1845 // Experimental support for CGroup memory limits
1846 if (UseCGroupMemoryLimitForHeap) {
1847 // This is a rough indicator that a CGroup limit may be in force
1848 // for this process
1849 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1850 FILE *fp = fopen(lim_file, "r");
1851 if (fp != NULL) {
1852 julong cgroup_max = 0;
1853 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1854 if (ret == 1 && cgroup_max > 0) {
1855 // If unlimited, cgroup_max will be a very large, but unspecified
1856 // value, so use initial phys_mem as a limit
1857 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1858 JULONG_FORMAT "MB) and initial phys_mem ("
1859 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1860 phys_mem = MIN2(cgroup_max, phys_mem);
1861 } else {
1862 warning("Unable to read/parse cgroup memory limit from %s: %s",
1863 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1864 }
1865 fclose(fp);
1866 } else {
1867 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1868 }
1869 }
1870
1871 // Convert deprecated flags
1872 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1873 !FLAG_IS_DEFAULT(MaxRAMFraction))
1874 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1875
1876 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1877 !FLAG_IS_DEFAULT(MinRAMFraction))
1878 MinRAMPercentage = 100.0 / MinRAMFraction;
1879
1880 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1881 !FLAG_IS_DEFAULT(InitialRAMFraction))
1882 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1883
1884 // If the maximum heap size has not been set with -Xmx,
1885 // then set it as fraction of the size of physical memory,
1886 // respecting the maximum and minimum sizes of the heap.
1887 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1888 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1889 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1890 if (reasonable_min < MaxHeapSize) {
1891 // Small physical memory, so use a minimum fraction of it for the heap
1892 reasonable_max = reasonable_min;
1893 } else {
1894 // Not-small physical memory, so require a heap at least
1895 // as large as MaxHeapSize
1896 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1897 }
1898
1899 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1900 // Limit the heap size to ErgoHeapSizeLimit
1901 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1902 }
1903 if (UseCompressedOops) {
1904 // Limit the heap size to the maximum possible when using compressed oops
1905 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1906
1907 // HeapBaseMinAddress can be greater than default but not less than.
1908 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1909 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1910 // matches compressed oops printing flags
1911 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1912 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1913 DefaultHeapBaseMinAddress,
1914 DefaultHeapBaseMinAddress/G,
1915 HeapBaseMinAddress);
1916 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1917 }
1918 }
1919
1920 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1921 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1922 // but it should be not less than default MaxHeapSize.
1923 max_coop_heap -= HeapBaseMinAddress;
1924 }
1925 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1926 }
1927 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1928
1929 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1930 // An initial heap size was specified on the command line,
1931 // so be sure that the maximum size is consistent. Done
1932 // after call to limit_by_allocatable_memory because that
1933 // method might reduce the allocation size.
1934 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1935 }
1936
1937 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1938 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1939 }
1940
1941 // If the minimum or initial heap_size have not been set or requested to be set
1942 // ergonomically, set them accordingly.
1943 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1944 julong reasonable_minimum = (julong)(OldSize + NewSize);
1945
1946 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1947
1948 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1949
1950 if (InitialHeapSize == 0) {
1951 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1952
1953 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1954 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1955
1956 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1957
1958 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1959 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1960 }
1961 // If the minimum heap size has not been set (via -Xms),
1962 // synchronize with InitialHeapSize to avoid errors with the default value.
1963 if (min_heap_size() == 0) {
1964 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1965 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1966 }
1967 }
1968 }
1969
1970 // This option inspects the machine and attempts to set various
1971 // parameters to be optimal for long-running, memory allocation
1972 // intensive jobs. It is intended for machines with large
1973 // amounts of cpu and memory.
1974 jint Arguments::set_aggressive_heap_flags() {
1975 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1976 // VM, but we may not be able to represent the total physical memory
1977 // available (like having 8gb of memory on a box but using a 32bit VM).
1978 // Thus, we need to make sure we're using a julong for intermediate
1979 // calculations.
1980 julong initHeapSize;
1981 julong total_memory = os::physical_memory();
1982
1983 if (total_memory < (julong) 256 * M) {
1984 jio_fprintf(defaultStream::error_stream(),
1985 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1986 vm_exit(1);
1987 }
1988
1989 // The heap size is half of available memory, or (at most)
1990 // all of possible memory less 160mb (leaving room for the OS
1991 // when using ISM). This is the maximum; because adaptive sizing
1992 // is turned on below, the actual space used may be smaller.
1993
1994 initHeapSize = MIN2(total_memory / (julong) 2,
1995 total_memory - (julong) 160 * M);
1996
1997 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1998
1999 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2000 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2001 return JNI_EINVAL;
2002 }
2003 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2004 return JNI_EINVAL;
2005 }
2006 // Currently the minimum size and the initial heap sizes are the same.
2007 set_min_heap_size(initHeapSize);
2008 }
2009 if (FLAG_IS_DEFAULT(NewSize)) {
2010 // Make the young generation 3/8ths of the total heap.
2011 if (FLAG_SET_CMDLINE(size_t, NewSize,
2012 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2013 return JNI_EINVAL;
2014 }
2015 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2016 return JNI_EINVAL;
2017 }
2018 }
2019
2020 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2021 FLAG_SET_DEFAULT(UseLargePages, true);
2022 #endif
2023
2024 // Increase some data structure sizes for efficiency
2025 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2026 return JNI_EINVAL;
2027 }
2028 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2029 return JNI_EINVAL;
2030 }
2031 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2032 return JNI_EINVAL;
2033 }
2034
2035 // See the OldPLABSize comment below, but replace 'after promotion'
2036 // with 'after copying'. YoungPLABSize is the size of the survivor
2037 // space per-gc-thread buffers. The default is 4kw.
2038 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2039 return JNI_EINVAL;
2040 }
2041
2042 // OldPLABSize is the size of the buffers in the old gen that
2043 // UseParallelGC uses to promote live data that doesn't fit in the
2044 // survivor spaces. At any given time, there's one for each gc thread.
2045 // The default size is 1kw. These buffers are rarely used, since the
2046 // survivor spaces are usually big enough. For specjbb, however, there
2047 // are occasions when there's lots of live data in the young gen
2048 // and we end up promoting some of it. We don't have a definite
2049 // explanation for why bumping OldPLABSize helps, but the theory
2050 // is that a bigger PLAB results in retaining something like the
2051 // original allocation order after promotion, which improves mutator
2052 // locality. A minor effect may be that larger PLABs reduce the
2053 // number of PLAB allocation events during gc. The value of 8kw
2054 // was arrived at by experimenting with specjbb.
2055 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2056 return JNI_EINVAL;
2057 }
2058
2059 // Enable parallel GC and adaptive generation sizing
2060 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2061 return JNI_EINVAL;
2062 }
2063
2064 // Encourage steady state memory management
2065 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2066 return JNI_EINVAL;
2067 }
2068
2069 // This appears to improve mutator locality
2070 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2071 return JNI_EINVAL;
2072 }
2073
2074 // Get around early Solaris scheduling bug
2075 // (affinity vs other jobs on system)
2076 // but disallow DR and offlining (5008695).
2077 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2078 return JNI_EINVAL;
2079 }
2080
2081 return JNI_OK;
2082 }
2083
2084 // This must be called after ergonomics.
2085 void Arguments::set_bytecode_flags() {
2086 if (!RewriteBytecodes) {
2087 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2088 }
2089 }
2090
2091 // Aggressive optimization flags -XX:+AggressiveOpts
2092 jint Arguments::set_aggressive_opts_flags() {
2093 #ifdef COMPILER2
2094 if (AggressiveUnboxing) {
2095 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2096 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2097 } else if (!EliminateAutoBox) {
2098 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2099 AggressiveUnboxing = false;
2100 }
2101 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2102 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2103 } else if (!DoEscapeAnalysis) {
2104 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2105 AggressiveUnboxing = false;
2106 }
2107 }
2108 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2109 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2110 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2111 }
2112 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2113 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2114 }
2115
2116 // Feed the cache size setting into the JDK
2117 char buffer[1024];
2118 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2119 if (!add_property(buffer)) {
2120 return JNI_ENOMEM;
2121 }
2122 }
2123 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2124 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2125 }
2126 #endif
2127
2128 if (AggressiveOpts) {
2129 // Sample flag setting code
2130 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2131 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2132 // }
2133 }
2134
2135 return JNI_OK;
2136 }
2137
2138 //===========================================================================================================
2139 // Parsing of java.compiler property
2140
2141 void Arguments::process_java_compiler_argument(const char* arg) {
2142 // For backwards compatibility, Djava.compiler=NONE or ""
2143 // causes us to switch to -Xint mode UNLESS -Xdebug
2144 // is also specified.
2145 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2146 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2147 }
2148 }
2149
2150 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2151 _sun_java_launcher = os::strdup_check_oom(launcher);
2152 }
2153
2154 bool Arguments::created_by_java_launcher() {
2155 assert(_sun_java_launcher != NULL, "property must have value");
2156 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2157 }
2158
2159 bool Arguments::sun_java_launcher_is_altjvm() {
2160 return _sun_java_launcher_is_altjvm;
2161 }
2162
2163 //===========================================================================================================
2164 // Parsing of main arguments
2165
2166 #if INCLUDE_JVMCI
2167 // Check consistency of jvmci vm argument settings.
2168 bool Arguments::check_jvmci_args_consistency() {
2169 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2170 }
2171 #endif //INCLUDE_JVMCI
2172
2173 // Check consistency of GC selection
2174 bool Arguments::check_gc_consistency() {
2175 // Ensure that the user has not selected conflicting sets
2176 // of collectors.
2177 uint i = 0;
2178 if (UseSerialGC) i++;
2179 if (UseConcMarkSweepGC) i++;
2180 if (UseParallelGC || UseParallelOldGC) i++;
2181 if (UseG1GC) i++;
2182 if (i > 1) {
2183 jio_fprintf(defaultStream::error_stream(),
2184 "Conflicting collector combinations in option list; "
2185 "please refer to the release notes for the combinations "
2186 "allowed\n");
2187 return false;
2188 }
2189
2190 return true;
2191 }
2192
2193 // Check the consistency of vm_init_args
2194 bool Arguments::check_vm_args_consistency() {
2195 // Method for adding checks for flag consistency.
2196 // The intent is to warn the user of all possible conflicts,
2197 // before returning an error.
2198 // Note: Needs platform-dependent factoring.
2199 bool status = true;
2200
2201 if (TLABRefillWasteFraction == 0) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "TLABRefillWasteFraction should be a denominator, "
2204 "not " SIZE_FORMAT "\n",
2205 TLABRefillWasteFraction);
2206 status = false;
2207 }
2208
2209 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2210 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2211 }
2212
2213 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2214 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2215 }
2216
2217 if (GCTimeLimit == 100) {
2218 // Turn off gc-overhead-limit-exceeded checks
2219 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2220 }
2221
2222 status = status && check_gc_consistency();
2223
2224 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2225 // insists that we hold the requisite locks so that the iteration is
2226 // MT-safe. For the verification at start-up and shut-down, we don't
2227 // yet have a good way of acquiring and releasing these locks,
2228 // which are not visible at the CollectedHeap level. We want to
2229 // be able to acquire these locks and then do the iteration rather
2230 // than just disable the lock verification. This will be fixed under
2231 // bug 4788986.
2232 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2233 if (VerifyDuringStartup) {
2234 warning("Heap verification at start-up disabled "
2235 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2236 VerifyDuringStartup = false; // Disable verification at start-up
2237 }
2238
2239 if (VerifyBeforeExit) {
2240 warning("Heap verification at shutdown disabled "
2241 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2242 VerifyBeforeExit = false; // Disable verification at shutdown
2243 }
2244 }
2245
2246 if (PrintNMTStatistics) {
2247 #if INCLUDE_NMT
2248 if (MemTracker::tracking_level() == NMT_off) {
2249 #endif // INCLUDE_NMT
2250 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2251 PrintNMTStatistics = false;
2252 #if INCLUDE_NMT
2253 }
2254 #endif
2255 }
2256
2257 #if INCLUDE_JVMCI
2258 status = status && check_jvmci_args_consistency();
2259
2260 if (EnableJVMCI) {
2261 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2262 AddProperty, UnwriteableProperty, InternalProperty);
2263
2264 if (!ScavengeRootsInCode) {
2265 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2266 ScavengeRootsInCode = 1;
2267 }
2268 }
2269 #endif
2270
2271 // Check lower bounds of the code cache
2272 // Template Interpreter code is approximately 3X larger in debug builds.
2273 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2274 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2275 jio_fprintf(defaultStream::error_stream(),
2276 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2277 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2278 status = false;
2279 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2280 jio_fprintf(defaultStream::error_stream(),
2281 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2282 min_code_cache_size/K);
2283 status = false;
2284 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2285 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2288 CODE_CACHE_SIZE_LIMIT/M);
2289 status = false;
2290 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2291 jio_fprintf(defaultStream::error_stream(),
2292 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2293 min_code_cache_size/K);
2294 status = false;
2295 }
2296
2297 #ifdef _LP64
2298 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2299 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2300 }
2301 #endif
2302
2303 #ifndef SUPPORT_RESERVED_STACK_AREA
2304 if (StackReservedPages != 0) {
2305 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2306 warning("Reserved Stack Area not supported on this platform");
2307 }
2308 #endif
2309
2310 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2311 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2312 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2313 }
2314 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2315 }
2316 if (UseCompiler && is_interpreter_only()) {
2317 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2318 warning("UseCompiler disabled due to -Xint.");
2319 }
2320 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2321 }
2322 #ifdef COMPILER2
2323 if (PostLoopMultiversioning && !RangeCheckElimination) {
2324 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2325 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2326 }
2327 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2328 }
2329 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2330 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2331 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2332 }
2333 LoopStripMiningIter = 1;
2334 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2335 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2336 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2337 }
2338 LoopStripMiningIter = 0;
2339 }
2340 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2341 // blind guess
2342 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2343 }
2344 #endif
2345 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2346 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2347 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2348 }
2349 }
2350 return status;
2351 }
2352
2353 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2354 const char* option_type) {
2355 if (ignore) return false;
2356
2357 const char* spacer = " ";
2358 if (option_type == NULL) {
2359 option_type = ++spacer; // Set both to the empty string.
2360 }
2361
2362 if (os::obsolete_option(option)) {
2363 jio_fprintf(defaultStream::error_stream(),
2364 "Obsolete %s%soption: %s\n", option_type, spacer,
2365 option->optionString);
2366 return false;
2367 } else {
2368 jio_fprintf(defaultStream::error_stream(),
2369 "Unrecognized %s%soption: %s\n", option_type, spacer,
2370 option->optionString);
2371 return true;
2372 }
2373 }
2374
2375 static const char* user_assertion_options[] = {
2376 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2377 };
2378
2379 static const char* system_assertion_options[] = {
2380 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2381 };
2382
2383 bool Arguments::parse_uintx(const char* value,
2384 uintx* uintx_arg,
2385 uintx min_size) {
2386
2387 // Check the sign first since atojulong() parses only unsigned values.
2388 bool value_is_positive = !(*value == '-');
2389
2390 if (value_is_positive) {
2391 julong n;
2392 bool good_return = atojulong(value, &n);
2393 if (good_return) {
2394 bool above_minimum = n >= min_size;
2395 bool value_is_too_large = n > max_uintx;
2396
2397 if (above_minimum && !value_is_too_large) {
2398 *uintx_arg = n;
2399 return true;
2400 }
2401 }
2402 }
2403 return false;
2404 }
2405
2406 unsigned int addreads_count = 0;
2407 unsigned int addexports_count = 0;
2408 unsigned int addopens_count = 0;
2409 unsigned int addmods_count = 0;
2410 unsigned int patch_mod_count = 0;
2411
2412 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2413 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2414 char* property = AllocateHeap(prop_len, mtArguments);
2415 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2416 if (ret < 0 || ret >= (int)prop_len) {
2417 FreeHeap(property);
2418 return false;
2419 }
2420 bool added = add_property(property, UnwriteableProperty, internal);
2421 FreeHeap(property);
2422 return added;
2423 }
2424
2425 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2426 const unsigned int props_count_limit = 1000;
2427 const int max_digits = 3;
2428 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2429
2430 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2431 if (count < props_count_limit) {
2432 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2433 char* property = AllocateHeap(prop_len, mtArguments);
2434 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2435 if (ret < 0 || ret >= (int)prop_len) {
2436 FreeHeap(property);
2437 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2438 return false;
2439 }
2440 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2441 FreeHeap(property);
2442 return added;
2443 }
2444
2445 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2446 return false;
2447 }
2448
2449 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2450 julong* long_arg,
2451 julong min_size,
2452 julong max_size) {
2453 if (!atojulong(s, long_arg)) return arg_unreadable;
2454 return check_memory_size(*long_arg, min_size, max_size);
2455 }
2456
2457 // Parse JavaVMInitArgs structure
2458
2459 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2460 const JavaVMInitArgs *java_options_args,
2461 const JavaVMInitArgs *cmd_line_args) {
2462 bool patch_mod_javabase = false;
2463
2464 // Save default settings for some mode flags
2465 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2466 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2467 Arguments::_ClipInlining = ClipInlining;
2468 Arguments::_BackgroundCompilation = BackgroundCompilation;
2469 if (TieredCompilation) {
2470 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2471 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2472 }
2473
2474 // Setup flags for mixed which is the default
2475 set_mode_flags(_mixed);
2476
2477 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2478 // variable (if present).
2479 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2480 if (result != JNI_OK) {
2481 return result;
2482 }
2483
2484 // Parse args structure generated from the command line flags.
2485 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2486 if (result != JNI_OK) {
2487 return result;
2488 }
2489
2490 // Parse args structure generated from the _JAVA_OPTIONS environment
2491 // variable (if present) (mimics classic VM)
2492 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2493 if (result != JNI_OK) {
2494 return result;
2495 }
2496
2497 // We need to ensure processor and memory resources have been properly
2498 // configured - which may rely on arguments we just processed - before
2499 // doing the final argument processing. Any argument processing that
2500 // needs to know about processor and memory resources must occur after
2501 // this point.
2502
2503 os::init_container_support();
2504
2505 // Do final processing now that all arguments have been parsed
2506 result = finalize_vm_init_args(patch_mod_javabase);
2507 if (result != JNI_OK) {
2508 return result;
2509 }
2510
2511 return JNI_OK;
2512 }
2513
2514 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2515 // represents a valid JDWP agent. is_path==true denotes that we
2516 // are dealing with -agentpath (case where name is a path), otherwise with
2517 // -agentlib
2518 bool valid_jdwp_agent(char *name, bool is_path) {
2519 char *_name;
2520 const char *_jdwp = "jdwp";
2521 size_t _len_jdwp, _len_prefix;
2522
2523 if (is_path) {
2524 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2525 return false;
2526 }
2527
2528 _name++; // skip past last path separator
2529 _len_prefix = strlen(JNI_LIB_PREFIX);
2530
2531 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2532 return false;
2533 }
2534
2535 _name += _len_prefix;
2536 _len_jdwp = strlen(_jdwp);
2537
2538 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2539 _name += _len_jdwp;
2540 }
2541 else {
2542 return false;
2543 }
2544
2545 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2546 return false;
2547 }
2548
2549 return true;
2550 }
2551
2552 if (strcmp(name, _jdwp) == 0) {
2553 return true;
2554 }
2555
2556 return false;
2557 }
2558
2559 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2560 // --patch-module=<module>=<file>(<pathsep><file>)*
2561 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2562 // Find the equal sign between the module name and the path specification
2563 const char* module_equal = strchr(patch_mod_tail, '=');
2564 if (module_equal == NULL) {
2565 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2566 return JNI_ERR;
2567 } else {
2568 // Pick out the module name
2569 size_t module_len = module_equal - patch_mod_tail;
2570 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2571 if (module_name != NULL) {
2572 memcpy(module_name, patch_mod_tail, module_len);
2573 *(module_name + module_len) = '\0';
2574 // The path piece begins one past the module_equal sign
2575 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2576 FREE_C_HEAP_ARRAY(char, module_name);
2577 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2578 return JNI_ENOMEM;
2579 }
2580 } else {
2581 return JNI_ENOMEM;
2582 }
2583 }
2584 return JNI_OK;
2585 }
2586
2587 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2588 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2589 // The min and max sizes match the values in globals.hpp, but scaled
2590 // with K. The values have been chosen so that alignment with page
2591 // size doesn't change the max value, which makes the conversions
2592 // back and forth between Xss value and ThreadStackSize value easier.
2593 // The values have also been chosen to fit inside a 32-bit signed type.
2594 const julong min_ThreadStackSize = 0;
2595 const julong max_ThreadStackSize = 1 * M;
2596
2597 const julong min_size = min_ThreadStackSize * K;
2598 const julong max_size = max_ThreadStackSize * K;
2599
2600 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2601
2602 julong size = 0;
2603 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2604 if (errcode != arg_in_range) {
2605 bool silent = (option == NULL); // Allow testing to silence error messages
2606 if (!silent) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "Invalid thread stack size: %s\n", option->optionString);
2609 describe_range_error(errcode);
2610 }
2611 return JNI_EINVAL;
2612 }
2613
2614 // Internally track ThreadStackSize in units of 1024 bytes.
2615 const julong size_aligned = align_up(size, K);
2616 assert(size <= size_aligned,
2617 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2618 size, size_aligned);
2619
2620 const julong size_in_K = size_aligned / K;
2621 assert(size_in_K < (julong)max_intx,
2622 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2623 size_in_K);
2624
2625 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2626 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2627 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2628 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2629 max_expanded, size_in_K);
2630
2631 *out_ThreadStackSize = (intx)size_in_K;
2632
2633 return JNI_OK;
2634 }
2635
2636 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2637 // For match_option to return remaining or value part of option string
2638 const char* tail;
2639
2640 // iterate over arguments
2641 for (int index = 0; index < args->nOptions; index++) {
2642 bool is_absolute_path = false; // for -agentpath vs -agentlib
2643
2644 const JavaVMOption* option = args->options + index;
2645
2646 if (!match_option(option, "-Djava.class.path", &tail) &&
2647 !match_option(option, "-Dsun.java.command", &tail) &&
2648 !match_option(option, "-Dsun.java.launcher", &tail)) {
2649
2650 // add all jvm options to the jvm_args string. This string
2651 // is used later to set the java.vm.args PerfData string constant.
2652 // the -Djava.class.path and the -Dsun.java.command options are
2653 // omitted from jvm_args string as each have their own PerfData
2654 // string constant object.
2655 build_jvm_args(option->optionString);
2656 }
2657
2658 // -verbose:[class/module/gc/jni]
2659 if (match_option(option, "-verbose", &tail)) {
2660 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2661 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2662 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2663 } else if (!strcmp(tail, ":module")) {
2664 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2665 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2666 } else if (!strcmp(tail, ":gc")) {
2667 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2668 } else if (!strcmp(tail, ":jni")) {
2669 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 }
2673 // -da / -ea / -disableassertions / -enableassertions
2674 // These accept an optional class/package name separated by a colon, e.g.,
2675 // -da:java.lang.Thread.
2676 } else if (match_option(option, user_assertion_options, &tail, true)) {
2677 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2678 if (*tail == '\0') {
2679 JavaAssertions::setUserClassDefault(enable);
2680 } else {
2681 assert(*tail == ':', "bogus match by match_option()");
2682 JavaAssertions::addOption(tail + 1, enable);
2683 }
2684 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2685 } else if (match_option(option, system_assertion_options, &tail, false)) {
2686 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2687 JavaAssertions::setSystemClassDefault(enable);
2688 // -bootclasspath:
2689 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2690 jio_fprintf(defaultStream::output_stream(),
2691 "-Xbootclasspath is no longer a supported option.\n");
2692 return JNI_EINVAL;
2693 // -bootclasspath/a:
2694 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2695 Arguments::append_sysclasspath(tail);
2696 // -bootclasspath/p:
2697 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2698 jio_fprintf(defaultStream::output_stream(),
2699 "-Xbootclasspath/p is no longer a supported option.\n");
2700 return JNI_EINVAL;
2701 // -Xrun
2702 } else if (match_option(option, "-Xrun", &tail)) {
2703 if (tail != NULL) {
2704 const char* pos = strchr(tail, ':');
2705 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2706 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2707 jio_snprintf(name, len + 1, "%s", tail);
2708
2709 char *options = NULL;
2710 if(pos != NULL) {
2711 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2712 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2713 }
2714 #if !INCLUDE_JVMTI
2715 if (strcmp(name, "jdwp") == 0) {
2716 jio_fprintf(defaultStream::error_stream(),
2717 "Debugging agents are not supported in this VM\n");
2718 return JNI_ERR;
2719 }
2720 #endif // !INCLUDE_JVMTI
2721 add_init_library(name, options);
2722 }
2723 } else if (match_option(option, "--add-reads=", &tail)) {
2724 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2725 return JNI_ENOMEM;
2726 }
2727 } else if (match_option(option, "--add-exports=", &tail)) {
2728 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2729 return JNI_ENOMEM;
2730 }
2731 } else if (match_option(option, "--add-opens=", &tail)) {
2732 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2733 return JNI_ENOMEM;
2734 }
2735 } else if (match_option(option, "--add-modules=", &tail)) {
2736 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2737 return JNI_ENOMEM;
2738 }
2739 } else if (match_option(option, "--limit-modules=", &tail)) {
2740 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2741 return JNI_ENOMEM;
2742 }
2743 } else if (match_option(option, "--module-path=", &tail)) {
2744 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2745 return JNI_ENOMEM;
2746 }
2747 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2748 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2749 return JNI_ENOMEM;
2750 }
2751 } else if (match_option(option, "--patch-module=", &tail)) {
2752 // --patch-module=<module>=<file>(<pathsep><file>)*
2753 int res = process_patch_mod_option(tail, patch_mod_javabase);
2754 if (res != JNI_OK) {
2755 return res;
2756 }
2757 } else if (match_option(option, "--illegal-access=", &tail)) {
2758 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2759 return JNI_ENOMEM;
2760 }
2761 // -agentlib and -agentpath
2762 } else if (match_option(option, "-agentlib:", &tail) ||
2763 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2764 if(tail != NULL) {
2765 const char* pos = strchr(tail, '=');
2766 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2767 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2768 name[len] = '\0';
2769
2770 char *options = NULL;
2771 if(pos != NULL) {
2772 options = os::strdup_check_oom(pos + 1, mtArguments);
2773 }
2774 #if !INCLUDE_JVMTI
2775 if (valid_jdwp_agent(name, is_absolute_path)) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Debugging agents are not supported in this VM\n");
2778 return JNI_ERR;
2779 }
2780 #endif // !INCLUDE_JVMTI
2781 add_init_agent(name, options, is_absolute_path);
2782 }
2783 // -javaagent
2784 } else if (match_option(option, "-javaagent:", &tail)) {
2785 #if !INCLUDE_JVMTI
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Instrumentation agents are not supported in this VM\n");
2788 return JNI_ERR;
2789 #else
2790 if (tail != NULL) {
2791 size_t length = strlen(tail) + 1;
2792 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2793 jio_snprintf(options, length, "%s", tail);
2794 add_init_agent("instrument", options, false);
2795 // java agents need module java.instrument
2796 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2797 return JNI_ENOMEM;
2798 }
2799 }
2800 #endif // !INCLUDE_JVMTI
2801 // -Xnoclassgc
2802 } else if (match_option(option, "-Xnoclassgc")) {
2803 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2804 return JNI_EINVAL;
2805 }
2806 // -Xconcgc
2807 } else if (match_option(option, "-Xconcgc")) {
2808 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2809 return JNI_EINVAL;
2810 }
2811 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2812 // -Xnoconcgc
2813 } else if (match_option(option, "-Xnoconcgc")) {
2814 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2818 // -Xbatch
2819 } else if (match_option(option, "-Xbatch")) {
2820 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 // -Xmn for compatibility with other JVM vendors
2824 } else if (match_option(option, "-Xmn", &tail)) {
2825 julong long_initial_young_size = 0;
2826 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2827 if (errcode != arg_in_range) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Invalid initial young generation size: %s\n", option->optionString);
2830 describe_range_error(errcode);
2831 return JNI_EINVAL;
2832 }
2833 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2834 return JNI_EINVAL;
2835 }
2836 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2837 return JNI_EINVAL;
2838 }
2839 // -Xms
2840 } else if (match_option(option, "-Xms", &tail)) {
2841 julong long_initial_heap_size = 0;
2842 // an initial heap size of 0 means automatically determine
2843 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2844 if (errcode != arg_in_range) {
2845 jio_fprintf(defaultStream::error_stream(),
2846 "Invalid initial heap size: %s\n", option->optionString);
2847 describe_range_error(errcode);
2848 return JNI_EINVAL;
2849 }
2850 set_min_heap_size((size_t)long_initial_heap_size);
2851 // Currently the minimum size and the initial heap sizes are the same.
2852 // Can be overridden with -XX:InitialHeapSize.
2853 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 // -Xmx
2857 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2858 julong long_max_heap_size = 0;
2859 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2860 if (errcode != arg_in_range) {
2861 jio_fprintf(defaultStream::error_stream(),
2862 "Invalid maximum heap size: %s\n", option->optionString);
2863 describe_range_error(errcode);
2864 return JNI_EINVAL;
2865 }
2866 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 // Xmaxf
2870 } else if (match_option(option, "-Xmaxf", &tail)) {
2871 char* err;
2872 int maxf = (int)(strtod(tail, &err) * 100);
2873 if (*err != '\0' || *tail == '\0') {
2874 jio_fprintf(defaultStream::error_stream(),
2875 "Bad max heap free percentage size: %s\n",
2876 option->optionString);
2877 return JNI_EINVAL;
2878 } else {
2879 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 }
2883 // Xminf
2884 } else if (match_option(option, "-Xminf", &tail)) {
2885 char* err;
2886 int minf = (int)(strtod(tail, &err) * 100);
2887 if (*err != '\0' || *tail == '\0') {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Bad min heap free percentage size: %s\n",
2890 option->optionString);
2891 return JNI_EINVAL;
2892 } else {
2893 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 }
2897 // -Xss
2898 } else if (match_option(option, "-Xss", &tail)) {
2899 intx value = 0;
2900 jint err = parse_xss(option, tail, &value);
2901 if (err != JNI_OK) {
2902 return err;
2903 }
2904 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2908 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2909 julong long_ReservedCodeCacheSize = 0;
2910
2911 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2912 if (errcode != arg_in_range) {
2913 jio_fprintf(defaultStream::error_stream(),
2914 "Invalid maximum code cache size: %s.\n", option->optionString);
2915 return JNI_EINVAL;
2916 }
2917 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 // -green
2921 } else if (match_option(option, "-green")) {
2922 jio_fprintf(defaultStream::error_stream(),
2923 "Green threads support not available\n");
2924 return JNI_EINVAL;
2925 // -native
2926 } else if (match_option(option, "-native")) {
2927 // HotSpot always uses native threads, ignore silently for compatibility
2928 // -Xrs
2929 } else if (match_option(option, "-Xrs")) {
2930 // Classic/EVM option, new functionality
2931 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 // -Xprof
2935 } else if (match_option(option, "-Xprof")) {
2936 char version[256];
2937 // Obsolete in JDK 10
2938 JDK_Version::jdk(10).to_string(version, sizeof(version));
2939 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2940 // -Xconcurrentio
2941 } else if (match_option(option, "-Xconcurrentio")) {
2942 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2955 return JNI_EINVAL;
2956 }
2957
2958 // -Xinternalversion
2959 } else if (match_option(option, "-Xinternalversion")) {
2960 jio_fprintf(defaultStream::output_stream(), "%s\n",
2961 VM_Version::internal_vm_info_string());
2962 vm_exit(0);
2963 #ifndef PRODUCT
2964 // -Xprintflags
2965 } else if (match_option(option, "-Xprintflags")) {
2966 CommandLineFlags::printFlags(tty, false);
2967 vm_exit(0);
2968 #endif
2969 // -D
2970 } else if (match_option(option, "-D", &tail)) {
2971 const char* value;
2972 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2973 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2974 // abort if -Djava.endorsed.dirs is set
2975 jio_fprintf(defaultStream::output_stream(),
2976 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2977 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2978 return JNI_EINVAL;
2979 }
2980 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2981 *value != '\0' && strcmp(value, "\"\"") != 0) {
2982 // abort if -Djava.ext.dirs is set
2983 jio_fprintf(defaultStream::output_stream(),
2984 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2985 return JNI_EINVAL;
2986 }
2987 // Check for module related properties. They must be set using the modules
2988 // options. For example: use "--add-modules=java.sql", not
2989 // "-Djdk.module.addmods=java.sql"
2990 if (is_internal_module_property(option->optionString + 2)) {
2991 needs_module_property_warning = true;
2992 continue;
2993 }
2994
2995 if (!add_property(tail)) {
2996 return JNI_ENOMEM;
2997 }
2998 // Out of the box management support
2999 if (match_option(option, "-Dcom.sun.management", &tail)) {
3000 #if INCLUDE_MANAGEMENT
3001 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3002 return JNI_EINVAL;
3003 }
3004 // management agent in module jdk.management.agent
3005 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3006 return JNI_ENOMEM;
3007 }
3008 #else
3009 jio_fprintf(defaultStream::output_stream(),
3010 "-Dcom.sun.management is not supported in this VM.\n");
3011 return JNI_ERR;
3012 #endif
3013 }
3014 // -Xint
3015 } else if (match_option(option, "-Xint")) {
3016 set_mode_flags(_int);
3017 // -Xmixed
3018 } else if (match_option(option, "-Xmixed")) {
3019 set_mode_flags(_mixed);
3020 // -Xcomp
3021 } else if (match_option(option, "-Xcomp")) {
3022 // for testing the compiler; turn off all flags that inhibit compilation
3023 set_mode_flags(_comp);
3024 // -Xshare:dump
3025 } else if (match_option(option, "-Xshare:dump")) {
3026 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3027 return JNI_EINVAL;
3028 }
3029 set_mode_flags(_int); // Prevent compilation, which creates objects
3030 // -Xshare:on
3031 } else if (match_option(option, "-Xshare:on")) {
3032 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3033 return JNI_EINVAL;
3034 }
3035 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3036 return JNI_EINVAL;
3037 }
3038 // -Xshare:auto
3039 } else if (match_option(option, "-Xshare:auto")) {
3040 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3041 return JNI_EINVAL;
3042 }
3043 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3044 return JNI_EINVAL;
3045 }
3046 // -Xshare:off
3047 } else if (match_option(option, "-Xshare:off")) {
3048 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3049 return JNI_EINVAL;
3050 }
3051 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3052 return JNI_EINVAL;
3053 }
3054 // -Xverify
3055 } else if (match_option(option, "-Xverify", &tail)) {
3056 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3057 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3061 return JNI_EINVAL;
3062 }
3063 } else if (strcmp(tail, ":remote") == 0) {
3064 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3065 return JNI_EINVAL;
3066 }
3067 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 } else if (strcmp(tail, ":none") == 0) {
3071 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3078 return JNI_EINVAL;
3079 }
3080 // -Xdebug
3081 } else if (match_option(option, "-Xdebug")) {
3082 // note this flag has been used, then ignore
3083 set_xdebug_mode(true);
3084 // -Xnoagent
3085 } else if (match_option(option, "-Xnoagent")) {
3086 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3087 } else if (match_option(option, "-Xloggc:", &tail)) {
3088 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3089 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3090 _gc_log_filename = os::strdup_check_oom(tail);
3091 } else if (match_option(option, "-Xlog", &tail)) {
3092 bool ret = false;
3093 if (strcmp(tail, ":help") == 0) {
3094 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3095 vm_exit(0);
3096 } else if (strcmp(tail, ":disable") == 0) {
3097 LogConfiguration::disable_logging();
3098 ret = true;
3099 } else if (*tail == '\0') {
3100 ret = LogConfiguration::parse_command_line_arguments();
3101 assert(ret, "-Xlog without arguments should never fail to parse");
3102 } else if (*tail == ':') {
3103 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3104 }
3105 if (ret == false) {
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Invalid -Xlog option '-Xlog%s'\n",
3108 tail);
3109 return JNI_EINVAL;
3110 }
3111 // JNI hooks
3112 } else if (match_option(option, "-Xcheck", &tail)) {
3113 if (!strcmp(tail, ":jni")) {
3114 #if !INCLUDE_JNI_CHECK
3115 warning("JNI CHECKING is not supported in this VM");
3116 #else
3117 CheckJNICalls = true;
3118 #endif // INCLUDE_JNI_CHECK
3119 } else if (is_bad_option(option, args->ignoreUnrecognized,
3120 "check")) {
3121 return JNI_EINVAL;
3122 }
3123 } else if (match_option(option, "vfprintf")) {
3124 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3125 } else if (match_option(option, "exit")) {
3126 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3127 } else if (match_option(option, "abort")) {
3128 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3129 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3130 // and the last option wins.
3131 } else if (match_option(option, "-XX:+NeverTenure")) {
3132 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3133 return JNI_EINVAL;
3134 }
3135 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3139 return JNI_EINVAL;
3140 }
3141 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3142 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3146 return JNI_EINVAL;
3147 }
3148 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3152 uintx max_tenuring_thresh = 0;
3153 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3154 jio_fprintf(defaultStream::error_stream(),
3155 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3156 return JNI_EINVAL;
3157 }
3158
3159 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162
3163 if (MaxTenuringThreshold == 0) {
3164 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3165 return JNI_EINVAL;
3166 }
3167 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3168 return JNI_EINVAL;
3169 }
3170 } else {
3171 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 }
3178 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3179 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3180 return JNI_EINVAL;
3181 }
3182 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3183 return JNI_EINVAL;
3184 }
3185 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3186 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3193 #if defined(DTRACE_ENABLED)
3194 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3198 return JNI_EINVAL;
3199 }
3200 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 #else // defined(DTRACE_ENABLED)
3207 jio_fprintf(defaultStream::error_stream(),
3208 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3209 return JNI_EINVAL;
3210 #endif // defined(DTRACE_ENABLED)
3211 #ifdef ASSERT
3212 } else if (match_option(option, "-XX:+FullGCALot")) {
3213 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3214 return JNI_EINVAL;
3215 }
3216 // disable scavenge before parallel mark-compact
3217 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3218 return JNI_EINVAL;
3219 }
3220 #endif
3221 #if !INCLUDE_MANAGEMENT
3222 } else if (match_option(option, "-XX:+ManagementServer")) {
3223 jio_fprintf(defaultStream::error_stream(),
3224 "ManagementServer is not supported in this VM.\n");
3225 return JNI_ERR;
3226 #endif // INCLUDE_MANAGEMENT
3227 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3228 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3229 // already been handled
3230 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3231 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3232 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3233 return JNI_EINVAL;
3234 }
3235 }
3236 // Unknown option
3237 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3238 return JNI_ERR;
3239 }
3240 }
3241
3242 // PrintSharedArchiveAndExit will turn on
3243 // -Xshare:on
3244 // -Xlog:class+path=info
3245 if (PrintSharedArchiveAndExit) {
3246 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3247 return JNI_EINVAL;
3248 }
3249 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3250 return JNI_EINVAL;
3251 }
3252 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3253 }
3254
3255 // Change the default value for flags which have different default values
3256 // when working with older JDKs.
3257 #ifdef LINUX
3258 if (JDK_Version::current().compare_major(6) <= 0 &&
3259 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3260 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3261 }
3262 #endif // LINUX
3263 fix_appclasspath();
3264 return JNI_OK;
3265 }
3266
3267 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3268 // For java.base check for duplicate --patch-module options being specified on the command line.
3269 // This check is only required for java.base, all other duplicate module specifications
3270 // will be checked during module system initialization. The module system initialization
3271 // will throw an ExceptionInInitializerError if this situation occurs.
3272 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3273 if (*patch_mod_javabase) {
3274 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3275 } else {
3276 *patch_mod_javabase = true;
3277 }
3278 }
3279
3280 // Create GrowableArray lazily, only if --patch-module has been specified
3281 if (_patch_mod_prefix == NULL) {
3282 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3283 }
3284
3285 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3286 }
3287
3288 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3289 //
3290 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3291 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3292 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3293 // path is treated as the current directory.
3294 //
3295 // This causes problems with CDS, which requires that all directories specified in the classpath
3296 // must be empty. In most cases, applications do NOT want to load classes from the current
3297 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3298 // scripts compatible with CDS.
3299 void Arguments::fix_appclasspath() {
3300 if (IgnoreEmptyClassPaths) {
3301 const char separator = *os::path_separator();
3302 const char* src = _java_class_path->value();
3303
3304 // skip over all the leading empty paths
3305 while (*src == separator) {
3306 src ++;
3307 }
3308
3309 char* copy = os::strdup_check_oom(src, mtArguments);
3310
3311 // trim all trailing empty paths
3312 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3313 *tail = '\0';
3314 }
3315
3316 char from[3] = {separator, separator, '\0'};
3317 char to [2] = {separator, '\0'};
3318 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3319 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3320 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3321 }
3322
3323 _java_class_path->set_writeable_value(copy);
3324 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3325 }
3326 }
3327
3328 static bool has_jar_files(const char* directory) {
3329 DIR* dir = os::opendir(directory);
3330 if (dir == NULL) return false;
3331
3332 struct dirent *entry;
3333 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3334 bool hasJarFile = false;
3335 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3336 const char* name = entry->d_name;
3337 const char* ext = name + strlen(name) - 4;
3338 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3339 }
3340 FREE_C_HEAP_ARRAY(char, dbuf);
3341 os::closedir(dir);
3342 return hasJarFile ;
3343 }
3344
3345 static int check_non_empty_dirs(const char* path) {
3346 const char separator = *os::path_separator();
3347 const char* const end = path + strlen(path);
3348 int nonEmptyDirs = 0;
3349 while (path < end) {
3350 const char* tmp_end = strchr(path, separator);
3351 if (tmp_end == NULL) {
3352 if (has_jar_files(path)) {
3353 nonEmptyDirs++;
3354 jio_fprintf(defaultStream::output_stream(),
3355 "Non-empty directory: %s\n", path);
3356 }
3357 path = end;
3358 } else {
3359 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3360 memcpy(dirpath, path, tmp_end - path);
3361 dirpath[tmp_end - path] = '\0';
3362 if (has_jar_files(dirpath)) {
3363 nonEmptyDirs++;
3364 jio_fprintf(defaultStream::output_stream(),
3365 "Non-empty directory: %s\n", dirpath);
3366 }
3367 FREE_C_HEAP_ARRAY(char, dirpath);
3368 path = tmp_end + 1;
3369 }
3370 }
3371 return nonEmptyDirs;
3372 }
3373
3374 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3375 // check if the default lib/endorsed directory exists; if so, error
3376 char path[JVM_MAXPATHLEN];
3377 const char* fileSep = os::file_separator();
3378 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3379
3380 if (CheckEndorsedAndExtDirs) {
3381 int nonEmptyDirs = 0;
3382 // check endorsed directory
3383 nonEmptyDirs += check_non_empty_dirs(path);
3384 // check the extension directories
3385 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3386 if (nonEmptyDirs > 0) {
3387 return JNI_ERR;
3388 }
3389 }
3390
3391 DIR* dir = os::opendir(path);
3392 if (dir != NULL) {
3393 jio_fprintf(defaultStream::output_stream(),
3394 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3395 "in modular form will be supported via the concept of upgradeable modules.\n");
3396 os::closedir(dir);
3397 return JNI_ERR;
3398 }
3399
3400 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3401 dir = os::opendir(path);
3402 if (dir != NULL) {
3403 jio_fprintf(defaultStream::output_stream(),
3404 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3405 "Use -classpath instead.\n.");
3406 os::closedir(dir);
3407 return JNI_ERR;
3408 }
3409
3410 // This must be done after all arguments have been processed
3411 // and the container support has been initialized since AggressiveHeap
3412 // relies on the amount of total memory available.
3413 if (AggressiveHeap) {
3414 jint result = set_aggressive_heap_flags();
3415 if (result != JNI_OK) {
3416 return result;
3417 }
3418 }
3419
3420 // This must be done after all arguments have been processed.
3421 // java_compiler() true means set to "NONE" or empty.
3422 if (java_compiler() && !xdebug_mode()) {
3423 // For backwards compatibility, we switch to interpreted mode if
3424 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3425 // not specified.
3426 set_mode_flags(_int);
3427 }
3428
3429 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3430 // but like -Xint, leave compilation thresholds unaffected.
3431 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3432 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3433 set_mode_flags(_int);
3434 }
3435
3436 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3437 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3438 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3439 }
3440
3441 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3442 // Don't degrade server performance for footprint
3443 if (FLAG_IS_DEFAULT(UseLargePages) &&
3444 MaxHeapSize < LargePageHeapSizeThreshold) {
3445 // No need for large granularity pages w/small heaps.
3446 // Note that large pages are enabled/disabled for both the
3447 // Java heap and the code cache.
3448 FLAG_SET_DEFAULT(UseLargePages, false);
3449 }
3450
3451 #elif defined(COMPILER2)
3452 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3453 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3454 }
3455 #endif
3456
3457 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3458 UNSUPPORTED_OPTION(ProfileInterpreter);
3459 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3460 #endif
3461
3462 #ifndef TIERED
3463 // Tiered compilation is undefined.
3464 UNSUPPORTED_OPTION(TieredCompilation);
3465 #endif
3466
3467 #if INCLUDE_JVMCI
3468 if (EnableJVMCI &&
3469 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3470 return JNI_ENOMEM;
3471 }
3472 #endif
3473
3474 // If we are running in a headless jre, force java.awt.headless property
3475 // to be true unless the property has already been set.
3476 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3477 if (os::is_headless_jre()) {
3478 const char* headless = Arguments::get_property("java.awt.headless");
3479 if (headless == NULL) {
3480 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3481 if (headless_env == NULL) {
3482 if (!add_property("java.awt.headless=true")) {
3483 return JNI_ENOMEM;
3484 }
3485 } else {
3486 char buffer[256];
3487 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3488 if (!add_property(buffer)) {
3489 return JNI_ENOMEM;
3490 }
3491 }
3492 }
3493 }
3494
3495 if (!check_vm_args_consistency()) {
3496 return JNI_ERR;
3497 }
3498
3499 #if INCLUDE_JVMCI
3500 if (UseJVMCICompiler) {
3501 Compilation_mode = CompMode_server;
3502 }
3503 #endif
3504
3505 #if INCLUDE_CDS
3506 if (DumpSharedSpaces) {
3507 // Disable biased locking now as it interferes with the clean up of
3508 // the archived Klasses and Java string objects (at dump time only).
3509 UseBiasedLocking = false;
3510 }
3511 if (UseSharedSpaces && patch_mod_javabase) {
3512 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3513 }
3514 #endif
3515
3516 return JNI_OK;
3517 }
3518
3519 // Helper class for controlling the lifetime of JavaVMInitArgs
3520 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3521 // deleted on the destruction of the ScopedVMInitArgs object.
3522 class ScopedVMInitArgs : public StackObj {
3523 private:
3524 JavaVMInitArgs _args;
3525 char* _container_name;
3526 bool _is_set;
3527 char* _vm_options_file_arg;
3528
3529 public:
3530 ScopedVMInitArgs(const char *container_name) {
3531 _args.version = JNI_VERSION_1_2;
3532 _args.nOptions = 0;
3533 _args.options = NULL;
3534 _args.ignoreUnrecognized = false;
3535 _container_name = (char *)container_name;
3536 _is_set = false;
3537 _vm_options_file_arg = NULL;
3538 }
3539
3540 // Populates the JavaVMInitArgs object represented by this
3541 // ScopedVMInitArgs object with the arguments in options. The
3542 // allocated memory is deleted by the destructor. If this method
3543 // returns anything other than JNI_OK, then this object is in a
3544 // partially constructed state, and should be abandoned.
3545 jint set_args(GrowableArray<JavaVMOption>* options) {
3546 _is_set = true;
3547 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3548 JavaVMOption, options->length(), mtArguments);
3549 if (options_arr == NULL) {
3550 return JNI_ENOMEM;
3551 }
3552 _args.options = options_arr;
3553
3554 for (int i = 0; i < options->length(); i++) {
3555 options_arr[i] = options->at(i);
3556 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3557 if (options_arr[i].optionString == NULL) {
3558 // Rely on the destructor to do cleanup.
3559 _args.nOptions = i;
3560 return JNI_ENOMEM;
3561 }
3562 }
3563
3564 _args.nOptions = options->length();
3565 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3566 return JNI_OK;
3567 }
3568
3569 JavaVMInitArgs* get() { return &_args; }
3570 char* container_name() { return _container_name; }
3571 bool is_set() { return _is_set; }
3572 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3573 char* vm_options_file_arg() { return _vm_options_file_arg; }
3574
3575 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3576 if (_vm_options_file_arg != NULL) {
3577 os::free(_vm_options_file_arg);
3578 }
3579 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3580 }
3581
3582 ~ScopedVMInitArgs() {
3583 if (_vm_options_file_arg != NULL) {
3584 os::free(_vm_options_file_arg);
3585 }
3586 if (_args.options == NULL) return;
3587 for (int i = 0; i < _args.nOptions; i++) {
3588 os::free(_args.options[i].optionString);
3589 }
3590 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3591 }
3592
3593 // Insert options into this option list, to replace option at
3594 // vm_options_file_pos (-XX:VMOptionsFile)
3595 jint insert(const JavaVMInitArgs* args,
3596 const JavaVMInitArgs* args_to_insert,
3597 const int vm_options_file_pos) {
3598 assert(_args.options == NULL, "shouldn't be set yet");
3599 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3600 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3601
3602 int length = args->nOptions + args_to_insert->nOptions - 1;
3603 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3604 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3605 for (int i = 0; i < args->nOptions; i++) {
3606 if (i == vm_options_file_pos) {
3607 // insert the new options starting at the same place as the
3608 // -XX:VMOptionsFile option
3609 for (int j = 0; j < args_to_insert->nOptions; j++) {
3610 options->push(args_to_insert->options[j]);
3611 }
3612 } else {
3613 options->push(args->options[i]);
3614 }
3615 }
3616 // make into options array
3617 jint result = set_args(options);
3618 delete options;
3619 return result;
3620 }
3621 };
3622
3623 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3624 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3625 }
3626
3627 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3628 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3629 }
3630
3631 jint Arguments::parse_options_environment_variable(const char* name,
3632 ScopedVMInitArgs* vm_args) {
3633 char *buffer = ::getenv(name);
3634
3635 // Don't check this environment variable if user has special privileges
3636 // (e.g. unix su command).
3637 if (buffer == NULL || os::have_special_privileges()) {
3638 return JNI_OK;
3639 }
3640
3641 if ((buffer = os::strdup(buffer)) == NULL) {
3642 return JNI_ENOMEM;
3643 }
3644
3645 jio_fprintf(defaultStream::error_stream(),
3646 "Picked up %s: %s\n", name, buffer);
3647
3648 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3649
3650 os::free(buffer);
3651 return retcode;
3652 }
3653
3654 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3655 // read file into buffer
3656 int fd = ::open(file_name, O_RDONLY);
3657 if (fd < 0) {
3658 jio_fprintf(defaultStream::error_stream(),
3659 "Could not open options file '%s'\n",
3660 file_name);
3661 return JNI_ERR;
3662 }
3663
3664 struct stat stbuf;
3665 int retcode = os::stat(file_name, &stbuf);
3666 if (retcode != 0) {
3667 jio_fprintf(defaultStream::error_stream(),
3668 "Could not stat options file '%s'\n",
3669 file_name);
3670 os::close(fd);
3671 return JNI_ERR;
3672 }
3673
3674 if (stbuf.st_size == 0) {
3675 // tell caller there is no option data and that is ok
3676 os::close(fd);
3677 return JNI_OK;
3678 }
3679
3680 // '+ 1' for NULL termination even with max bytes
3681 size_t bytes_alloc = stbuf.st_size + 1;
3682
3683 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3684 if (NULL == buf) {
3685 jio_fprintf(defaultStream::error_stream(),
3686 "Could not allocate read buffer for options file parse\n");
3687 os::close(fd);
3688 return JNI_ENOMEM;
3689 }
3690
3691 memset(buf, 0, bytes_alloc);
3692
3693 // Fill buffer
3694 // Use ::read() instead of os::read because os::read()
3695 // might do a thread state transition
3696 // and it is too early for that here
3697
3698 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3699 os::close(fd);
3700 if (bytes_read < 0) {
3701 FREE_C_HEAP_ARRAY(char, buf);
3702 jio_fprintf(defaultStream::error_stream(),
3703 "Could not read options file '%s'\n", file_name);
3704 return JNI_ERR;
3705 }
3706
3707 if (bytes_read == 0) {
3708 // tell caller there is no option data and that is ok
3709 FREE_C_HEAP_ARRAY(char, buf);
3710 return JNI_OK;
3711 }
3712
3713 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3714
3715 FREE_C_HEAP_ARRAY(char, buf);
3716 return retcode;
3717 }
3718
3719 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3720 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3721
3722 // some pointers to help with parsing
3723 char *buffer_end = buffer + buf_len;
3724 char *opt_hd = buffer;
3725 char *wrt = buffer;
3726 char *rd = buffer;
3727
3728 // parse all options
3729 while (rd < buffer_end) {
3730 // skip leading white space from the input string
3731 while (rd < buffer_end && isspace(*rd)) {
3732 rd++;
3733 }
3734
3735 if (rd >= buffer_end) {
3736 break;
3737 }
3738
3739 // Remember this is where we found the head of the token.
3740 opt_hd = wrt;
3741
3742 // Tokens are strings of non white space characters separated
3743 // by one or more white spaces.
3744 while (rd < buffer_end && !isspace(*rd)) {
3745 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3746 int quote = *rd; // matching quote to look for
3747 rd++; // don't copy open quote
3748 while (rd < buffer_end && *rd != quote) {
3749 // include everything (even spaces)
3750 // up until the close quote
3751 *wrt++ = *rd++; // copy to option string
3752 }
3753
3754 if (rd < buffer_end) {
3755 rd++; // don't copy close quote
3756 } else {
3757 // did not see closing quote
3758 jio_fprintf(defaultStream::error_stream(),
3759 "Unmatched quote in %s\n", name);
3760 delete options;
3761 return JNI_ERR;
3762 }
3763 } else {
3764 *wrt++ = *rd++; // copy to option string
3765 }
3766 }
3767
3768 // steal a white space character and set it to NULL
3769 *wrt++ = '\0';
3770 // We now have a complete token
3771
3772 JavaVMOption option;
3773 option.optionString = opt_hd;
3774 option.extraInfo = NULL;
3775
3776 options->append(option); // Fill in option
3777
3778 rd++; // Advance to next character
3779 }
3780
3781 // Fill out JavaVMInitArgs structure.
3782 jint status = vm_args->set_args(options);
3783
3784 delete options;
3785 return status;
3786 }
3787
3788 void Arguments::set_shared_spaces_flags() {
3789 if (DumpSharedSpaces) {
3790 if (FailOverToOldVerifier) {
3791 // Don't fall back to the old verifier on verification failure. If a
3792 // class fails verification with the split verifier, it might fail the
3793 // CDS runtime verifier constraint check. In that case, we don't want
3794 // to share the class. We only archive classes that pass the split verifier.
3795 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3796 }
3797
3798 if (RequireSharedSpaces) {
3799 warning("Cannot dump shared archive while using shared archive");
3800 }
3801 UseSharedSpaces = false;
3802 #ifdef _LP64
3803 if (!UseCompressedOops || !UseCompressedClassPointers) {
3804 vm_exit_during_initialization(
3805 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3806 }
3807 } else {
3808 if (!UseCompressedOops || !UseCompressedClassPointers) {
3809 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3810 }
3811 #endif
3812 }
3813 }
3814
3815 // Sharing support
3816 // Construct the path to the archive
3817 static char* get_shared_archive_path() {
3818 char *shared_archive_path;
3819 if (SharedArchiveFile == NULL) {
3820 char jvm_path[JVM_MAXPATHLEN];
3821 os::jvm_path(jvm_path, sizeof(jvm_path));
3822 char *end = strrchr(jvm_path, *os::file_separator());
3823 if (end != NULL) *end = '\0';
3824 size_t jvm_path_len = strlen(jvm_path);
3825 size_t file_sep_len = strlen(os::file_separator());
3826 const size_t len = jvm_path_len + file_sep_len + 20;
3827 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3828 if (shared_archive_path != NULL) {
3829 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3830 jvm_path, os::file_separator());
3831 }
3832 } else {
3833 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3834 }
3835 return shared_archive_path;
3836 }
3837
3838 #ifndef PRODUCT
3839 // Determine whether LogVMOutput should be implicitly turned on.
3840 static bool use_vm_log() {
3841 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3842 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3843 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3844 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3845 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3846 return true;
3847 }
3848
3849 #ifdef COMPILER1
3850 if (PrintC1Statistics) {
3851 return true;
3852 }
3853 #endif // COMPILER1
3854
3855 #ifdef COMPILER2
3856 if (PrintOptoAssembly || PrintOptoStatistics) {
3857 return true;
3858 }
3859 #endif // COMPILER2
3860
3861 return false;
3862 }
3863
3864 #endif // PRODUCT
3865
3866 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3867 for (int index = 0; index < args->nOptions; index++) {
3868 const JavaVMOption* option = args->options + index;
3869 const char* tail;
3870 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3871 return true;
3872 }
3873 }
3874 return false;
3875 }
3876
3877 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3878 const char* vm_options_file,
3879 const int vm_options_file_pos,
3880 ScopedVMInitArgs* vm_options_file_args,
3881 ScopedVMInitArgs* args_out) {
3882 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3883 if (code != JNI_OK) {
3884 return code;
3885 }
3886
3887 if (vm_options_file_args->get()->nOptions < 1) {
3888 return JNI_OK;
3889 }
3890
3891 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3892 jio_fprintf(defaultStream::error_stream(),
3893 "A VM options file may not refer to a VM options file. "
3894 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3895 "options file '%s' in options container '%s' is an error.\n",
3896 vm_options_file_args->vm_options_file_arg(),
3897 vm_options_file_args->container_name());
3898 return JNI_EINVAL;
3899 }
3900
3901 return args_out->insert(args, vm_options_file_args->get(),
3902 vm_options_file_pos);
3903 }
3904
3905 // Expand -XX:VMOptionsFile found in args_in as needed.
3906 // mod_args and args_out parameters may return values as needed.
3907 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3908 ScopedVMInitArgs* mod_args,
3909 JavaVMInitArgs** args_out) {
3910 jint code = match_special_option_and_act(args_in, mod_args);
3911 if (code != JNI_OK) {
3912 return code;
3913 }
3914
3915 if (mod_args->is_set()) {
3916 // args_in contains -XX:VMOptionsFile and mod_args contains the
3917 // original options from args_in along with the options expanded
3918 // from the VMOptionsFile. Return a short-hand to the caller.
3919 *args_out = mod_args->get();
3920 } else {
3921 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3922 }
3923 return JNI_OK;
3924 }
3925
3926 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3927 ScopedVMInitArgs* args_out) {
3928 // Remaining part of option string
3929 const char* tail;
3930 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3931
3932 for (int index = 0; index < args->nOptions; index++) {
3933 const JavaVMOption* option = args->options + index;
3934 if (ArgumentsExt::process_options(option)) {
3935 continue;
3936 }
3937 if (match_option(option, "-XX:Flags=", &tail)) {
3938 Arguments::set_jvm_flags_file(tail);
3939 continue;
3940 }
3941 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3942 if (vm_options_file_args.found_vm_options_file_arg()) {
3943 jio_fprintf(defaultStream::error_stream(),
3944 "The option '%s' is already specified in the options "
3945 "container '%s' so the specification of '%s' in the "
3946 "same options container is an error.\n",
3947 vm_options_file_args.vm_options_file_arg(),
3948 vm_options_file_args.container_name(),
3949 option->optionString);
3950 return JNI_EINVAL;
3951 }
3952 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3953 // If there's a VMOptionsFile, parse that
3954 jint code = insert_vm_options_file(args, tail, index,
3955 &vm_options_file_args, args_out);
3956 if (code != JNI_OK) {
3957 return code;
3958 }
3959 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3960 if (args_out->is_set()) {
3961 // The VMOptions file inserted some options so switch 'args'
3962 // to the new set of options, and continue processing which
3963 // preserves "last option wins" semantics.
3964 args = args_out->get();
3965 // The first option from the VMOptionsFile replaces the
3966 // current option. So we back track to process the
3967 // replacement option.
3968 index--;
3969 }
3970 continue;
3971 }
3972 if (match_option(option, "-XX:+PrintVMOptions")) {
3973 PrintVMOptions = true;
3974 continue;
3975 }
3976 if (match_option(option, "-XX:-PrintVMOptions")) {
3977 PrintVMOptions = false;
3978 continue;
3979 }
3980 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3981 IgnoreUnrecognizedVMOptions = true;
3982 continue;
3983 }
3984 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3985 IgnoreUnrecognizedVMOptions = false;
3986 continue;
3987 }
3988 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3989 CommandLineFlags::printFlags(tty, false);
3990 vm_exit(0);
3991 }
3992 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3993 #if INCLUDE_NMT
3994 // The launcher did not setup nmt environment variable properly.
3995 if (!MemTracker::check_launcher_nmt_support(tail)) {
3996 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3997 }
3998
3999 // Verify if nmt option is valid.
4000 if (MemTracker::verify_nmt_option()) {
4001 // Late initialization, still in single-threaded mode.
4002 if (MemTracker::tracking_level() >= NMT_summary) {
4003 MemTracker::init();
4004 }
4005 } else {
4006 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4007 }
4008 continue;
4009 #else
4010 jio_fprintf(defaultStream::error_stream(),
4011 "Native Memory Tracking is not supported in this VM\n");
4012 return JNI_ERR;
4013 #endif
4014 }
4015
4016 #ifndef PRODUCT
4017 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4018 CommandLineFlags::printFlags(tty, true);
4019 vm_exit(0);
4020 }
4021 #endif
4022
4023 if (match_option(option, "-XX:+UseAppCDS")) {
4024 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4025 if (flag->is_diagnostic()) {
4026 flag->clear_diagnostic();
4027 }
4028 continue;
4029 }
4030 }
4031 return JNI_OK;
4032 }
4033
4034 static void print_options(const JavaVMInitArgs *args) {
4035 const char* tail;
4036 for (int index = 0; index < args->nOptions; index++) {
4037 const JavaVMOption *option = args->options + index;
4038 if (match_option(option, "-XX:", &tail)) {
4039 logOption(tail);
4040 }
4041 }
4042 }
4043
4044 bool Arguments::handle_deprecated_print_gc_flags() {
4045 if (PrintGC) {
4046 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4047 }
4048 if (PrintGCDetails) {
4049 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4050 }
4051
4052 if (_gc_log_filename != NULL) {
4053 // -Xloggc was used to specify a filename
4054 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4055
4056 LogTarget(Error, logging) target;
4057 LogStream errstream(target);
4058 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4059 } else if (PrintGC || PrintGCDetails) {
4060 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4061 }
4062 return true;
4063 }
4064
4065 void Arguments::handle_extra_cms_flags(const char* msg) {
4066 SpecialFlag flag;
4067 const char *flag_name = "UseConcMarkSweepGC";
4068 if (lookup_special_flag(flag_name, flag)) {
4069 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4070 warning("%s", msg);
4071 }
4072 }
4073
4074 // Parse entry point called from JNI_CreateJavaVM
4075
4076 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4077 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4078
4079 // Initialize ranges, constraints and writeables
4080 CommandLineFlagRangeList::init();
4081 CommandLineFlagConstraintList::init();
4082 CommandLineFlagWriteableList::init();
4083
4084 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4085 const char* hotspotrc = ".hotspotrc";
4086 bool settings_file_specified = false;
4087 bool needs_hotspotrc_warning = false;
4088 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4089 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4090
4091 // Pointers to current working set of containers
4092 JavaVMInitArgs* cur_cmd_args;
4093 JavaVMInitArgs* cur_java_options_args;
4094 JavaVMInitArgs* cur_java_tool_options_args;
4095
4096 // Containers for modified/expanded options
4097 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4098 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4099 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4100
4101
4102 jint code =
4103 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4104 if (code != JNI_OK) {
4105 return code;
4106 }
4107
4108 code = parse_java_options_environment_variable(&initial_java_options_args);
4109 if (code != JNI_OK) {
4110 return code;
4111 }
4112
4113 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4114 &mod_java_tool_options_args,
4115 &cur_java_tool_options_args);
4116 if (code != JNI_OK) {
4117 return code;
4118 }
4119
4120 code = expand_vm_options_as_needed(initial_cmd_args,
4121 &mod_cmd_args,
4122 &cur_cmd_args);
4123 if (code != JNI_OK) {
4124 return code;
4125 }
4126
4127 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4128 &mod_java_options_args,
4129 &cur_java_options_args);
4130 if (code != JNI_OK) {
4131 return code;
4132 }
4133
4134 const char* flags_file = Arguments::get_jvm_flags_file();
4135 settings_file_specified = (flags_file != NULL);
4136
4137 if (IgnoreUnrecognizedVMOptions) {
4138 cur_cmd_args->ignoreUnrecognized = true;
4139 cur_java_tool_options_args->ignoreUnrecognized = true;
4140 cur_java_options_args->ignoreUnrecognized = true;
4141 }
4142
4143 // Parse specified settings file
4144 if (settings_file_specified) {
4145 if (!process_settings_file(flags_file, true,
4146 cur_cmd_args->ignoreUnrecognized)) {
4147 return JNI_EINVAL;
4148 }
4149 } else {
4150 #ifdef ASSERT
4151 // Parse default .hotspotrc settings file
4152 if (!process_settings_file(".hotspotrc", false,
4153 cur_cmd_args->ignoreUnrecognized)) {
4154 return JNI_EINVAL;
4155 }
4156 #else
4157 struct stat buf;
4158 if (os::stat(hotspotrc, &buf) == 0) {
4159 needs_hotspotrc_warning = true;
4160 }
4161 #endif
4162 }
4163
4164 if (PrintVMOptions) {
4165 print_options(cur_java_tool_options_args);
4166 print_options(cur_cmd_args);
4167 print_options(cur_java_options_args);
4168 }
4169
4170 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4171 jint result = parse_vm_init_args(cur_java_tool_options_args,
4172 cur_java_options_args,
4173 cur_cmd_args);
4174
4175 if (result != JNI_OK) {
4176 return result;
4177 }
4178
4179 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4180 SharedArchivePath = get_shared_archive_path();
4181 if (SharedArchivePath == NULL) {
4182 return JNI_ENOMEM;
4183 }
4184
4185 // Set up VerifySharedSpaces
4186 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4187 VerifySharedSpaces = true;
4188 }
4189
4190 // Delay warning until here so that we've had a chance to process
4191 // the -XX:-PrintWarnings flag
4192 if (needs_hotspotrc_warning) {
4193 warning("%s file is present but has been ignored. "
4194 "Run with -XX:Flags=%s to load the file.",
4195 hotspotrc, hotspotrc);
4196 }
4197
4198 if (needs_module_property_warning) {
4199 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4200 " names that are reserved for internal use.");
4201 }
4202
4203 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4204 UNSUPPORTED_OPTION(UseLargePages);
4205 #endif
4206
4207 ArgumentsExt::report_unsupported_options();
4208
4209 #ifndef PRODUCT
4210 if (TraceBytecodesAt != 0) {
4211 TraceBytecodes = true;
4212 }
4213 if (CountCompiledCalls) {
4214 if (UseCounterDecay) {
4215 warning("UseCounterDecay disabled because CountCalls is set");
4216 UseCounterDecay = false;
4217 }
4218 }
4219 #endif // PRODUCT
4220
4221 if (ScavengeRootsInCode == 0) {
4222 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4223 warning("Forcing ScavengeRootsInCode non-zero");
4224 }
4225 ScavengeRootsInCode = 1;
4226 }
4227
4228 if (!handle_deprecated_print_gc_flags()) {
4229 return JNI_EINVAL;
4230 }
4231
4232 // Set object alignment values.
4233 set_object_alignment();
4234
4235 #if !INCLUDE_CDS
4236 if (DumpSharedSpaces || RequireSharedSpaces) {
4237 jio_fprintf(defaultStream::error_stream(),
4238 "Shared spaces are not supported in this VM\n");
4239 return JNI_ERR;
4240 }
4241 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4242 log_is_enabled(Info, cds)) {
4243 warning("Shared spaces are not supported in this VM");
4244 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4245 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4246 }
4247 no_shared_spaces("CDS Disabled");
4248 #endif // INCLUDE_CDS
4249
4250 return JNI_OK;
4251 }
4252
4253 jint Arguments::apply_ergo() {
4254 // Set flags based on ergonomics.
4255 jint result = set_ergonomics_flags();
4256 if (result != JNI_OK) return result;
4257
4258 #if INCLUDE_JVMCI
4259 set_jvmci_specific_flags();
4260 #endif
4261
4262 set_shared_spaces_flags();
4263
4264 // Check the GC selections again.
4265 if (!check_gc_consistency()) {
4266 return JNI_EINVAL;
4267 }
4268
4269 if (TieredCompilation) {
4270 set_tiered_flags();
4271 } else {
4272 int max_compilation_policy_choice = 1;
4273 #ifdef COMPILER2
4274 if (is_server_compilation_mode_vm()) {
4275 max_compilation_policy_choice = 2;
4276 }
4277 #endif
4278 // Check if the policy is valid.
4279 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4280 vm_exit_during_initialization(
4281 "Incompatible compilation policy selected", NULL);
4282 }
4283 // Scale CompileThreshold
4284 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4285 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4286 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4287 }
4288 }
4289
4290 #ifdef COMPILER2
4291 #ifndef PRODUCT
4292 if (PrintIdealGraphLevel > 0) {
4293 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4294 }
4295 #endif
4296 #endif
4297
4298 // Set heap size based on available physical memory
4299 set_heap_size();
4300
4301 ArgumentsExt::set_gc_specific_flags();
4302
4303 // Initialize Metaspace flags and alignments
4304 Metaspace::ergo_initialize();
4305
4306 // Set bytecode rewriting flags
4307 set_bytecode_flags();
4308
4309 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4310 jint code = set_aggressive_opts_flags();
4311 if (code != JNI_OK) {
4312 return code;
4313 }
4314
4315 // Turn off biased locking for locking debug mode flags,
4316 // which are subtly different from each other but neither works with
4317 // biased locking
4318 if (UseHeavyMonitors
4319 #ifdef COMPILER1
4320 || !UseFastLocking
4321 #endif // COMPILER1
4322 #if INCLUDE_JVMCI
4323 || !JVMCIUseFastLocking
4324 #endif
4325 ) {
4326 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4327 // flag set to true on command line; warn the user that they
4328 // can't enable biased locking here
4329 warning("Biased Locking is not supported with locking debug flags"
4330 "; ignoring UseBiasedLocking flag." );
4331 }
4332 UseBiasedLocking = false;
4333 }
4334
4335 #ifdef CC_INTERP
4336 // Clear flags not supported on zero.
4337 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4338 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4339 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4340 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4341 #endif // CC_INTERP
4342
4343 #ifdef COMPILER2
4344 if (!EliminateLocks) {
4345 EliminateNestedLocks = false;
4346 }
4347 if (!Inline) {
4348 IncrementalInline = false;
4349 }
4350 #ifndef PRODUCT
4351 if (!IncrementalInline) {
4352 AlwaysIncrementalInline = false;
4353 }
4354 #endif
4355 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4356 // nothing to use the profiling, turn if off
4357 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4358 }
4359 #endif
4360
4361 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4362 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4363 DebugNonSafepoints = true;
4364 }
4365
4366 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4367 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4368 }
4369
4370 if (UseOnStackReplacement && !UseLoopCounter) {
4371 warning("On-stack-replacement requires loop counters; enabling loop counters");
4372 FLAG_SET_DEFAULT(UseLoopCounter, true);
4373 }
4374
4375 #ifndef PRODUCT
4376 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4377 if (use_vm_log()) {
4378 LogVMOutput = true;
4379 }
4380 }
4381 #endif // PRODUCT
4382
4383 if (PrintCommandLineFlags) {
4384 CommandLineFlags::printSetFlags(tty);
4385 }
4386
4387 // Apply CPU specific policy for the BiasedLocking
4388 if (UseBiasedLocking) {
4389 if (!VM_Version::use_biased_locking() &&
4390 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4391 UseBiasedLocking = false;
4392 }
4393 }
4394 #ifdef COMPILER2
4395 if (!UseBiasedLocking || EmitSync != 0) {
4396 UseOptoBiasInlining = false;
4397 }
4398 #endif
4399
4400 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4401 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4402 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4403 } else {
4404 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4405 }
4406
4407 return JNI_OK;
4408 }
4409
4410 jint Arguments::adjust_after_os() {
4411 if (UseNUMA) {
4412 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4413 FLAG_SET_ERGO(bool, UseNUMA, false);
4414 } else if (UseParallelGC || UseParallelOldGC) {
4415 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4416 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4417 }
4418 }
4419 // UseNUMAInterleaving is set to ON for all collectors and
4420 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4421 // such as the parallel collector for Linux and Solaris will
4422 // interleave old gen and survivor spaces on top of NUMA
4423 // allocation policy for the eden space.
4424 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4425 // all platforms and ParallelGC on Windows will interleave all
4426 // of the heap spaces across NUMA nodes.
4427 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4428 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4429 }
4430 }
4431 return JNI_OK;
4432 }
4433
4434 int Arguments::PropertyList_count(SystemProperty* pl) {
4435 int count = 0;
4436 while(pl != NULL) {
4437 count++;
4438 pl = pl->next();
4439 }
4440 return count;
4441 }
4442
4443 // Return the number of readable properties.
4444 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4445 int count = 0;
4446 while(pl != NULL) {
4447 if (pl->is_readable()) {
4448 count++;
4449 }
4450 pl = pl->next();
4451 }
4452 return count;
4453 }
4454
4455 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4456 assert(key != NULL, "just checking");
4457 SystemProperty* prop;
4458 for (prop = pl; prop != NULL; prop = prop->next()) {
4459 if (strcmp(key, prop->key()) == 0) return prop->value();
4460 }
4461 return NULL;
4462 }
4463
4464 // Return the value of the requested property provided that it is a readable property.
4465 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4466 assert(key != NULL, "just checking");
4467 SystemProperty* prop;
4468 // Return the property value if the keys match and the property is not internal or
4469 // it's the special internal property "jdk.boot.class.path.append".
4470 for (prop = pl; prop != NULL; prop = prop->next()) {
4471 if (strcmp(key, prop->key()) == 0) {
4472 if (!prop->internal()) {
4473 return prop->value();
4474 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4475 return prop->value();
4476 } else {
4477 // Property is internal and not jdk.boot.class.path.append so return NULL.
4478 return NULL;
4479 }
4480 }
4481 }
4482 return NULL;
4483 }
4484
4485 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4486 int count = 0;
4487 const char* ret_val = NULL;
4488
4489 while(pl != NULL) {
4490 if(count >= index) {
4491 ret_val = pl->key();
4492 break;
4493 }
4494 count++;
4495 pl = pl->next();
4496 }
4497
4498 return ret_val;
4499 }
4500
4501 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4502 int count = 0;
4503 char* ret_val = NULL;
4504
4505 while(pl != NULL) {
4506 if(count >= index) {
4507 ret_val = pl->value();
4508 break;
4509 }
4510 count++;
4511 pl = pl->next();
4512 }
4513
4514 return ret_val;
4515 }
4516
4517 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4518 SystemProperty* p = *plist;
4519 if (p == NULL) {
4520 *plist = new_p;
4521 } else {
4522 while (p->next() != NULL) {
4523 p = p->next();
4524 }
4525 p->set_next(new_p);
4526 }
4527 }
4528
4529 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4530 bool writeable, bool internal) {
4531 if (plist == NULL)
4532 return;
4533
4534 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4535 PropertyList_add(plist, new_p);
4536 }
4537
4538 void Arguments::PropertyList_add(SystemProperty *element) {
4539 PropertyList_add(&_system_properties, element);
4540 }
4541
4542 // This add maintains unique property key in the list.
4543 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4544 PropertyAppendable append, PropertyWriteable writeable,
4545 PropertyInternal internal) {
4546 if (plist == NULL)
4547 return;
4548
4549 // If property key exist then update with new value.
4550 SystemProperty* prop;
4551 for (prop = *plist; prop != NULL; prop = prop->next()) {
4552 if (strcmp(k, prop->key()) == 0) {
4553 if (append == AppendProperty) {
4554 prop->append_value(v);
4555 } else {
4556 prop->set_value(v);
4557 }
4558 return;
4559 }
4560 }
4561
4562 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4563 }
4564
4565 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4566 // Returns true if all of the source pointed by src has been copied over to
4567 // the destination buffer pointed by buf. Otherwise, returns false.
4568 // Notes:
4569 // 1. If the length (buflen) of the destination buffer excluding the
4570 // NULL terminator character is not long enough for holding the expanded
4571 // pid characters, it also returns false instead of returning the partially
4572 // expanded one.
4573 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4574 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4575 char* buf, size_t buflen) {
4576 const char* p = src;
4577 char* b = buf;
4578 const char* src_end = &src[srclen];
4579 char* buf_end = &buf[buflen - 1];
4580
4581 while (p < src_end && b < buf_end) {
4582 if (*p == '%') {
4583 switch (*(++p)) {
4584 case '%': // "%%" ==> "%"
4585 *b++ = *p++;
4586 break;
4587 case 'p': { // "%p" ==> current process id
4588 // buf_end points to the character before the last character so
4589 // that we could write '\0' to the end of the buffer.
4590 size_t buf_sz = buf_end - b + 1;
4591 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4592
4593 // if jio_snprintf fails or the buffer is not long enough to hold
4594 // the expanded pid, returns false.
4595 if (ret < 0 || ret >= (int)buf_sz) {
4596 return false;
4597 } else {
4598 b += ret;
4599 assert(*b == '\0', "fail in copy_expand_pid");
4600 if (p == src_end && b == buf_end + 1) {
4601 // reach the end of the buffer.
4602 return true;
4603 }
4604 }
4605 p++;
4606 break;
4607 }
4608 default :
4609 *b++ = '%';
4610 }
4611 } else {
4612 *b++ = *p++;
4613 }
4614 }
4615 *b = '\0';
4616 return (p == src_end); // return false if not all of the source was copied
4617 }