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 // Verifies the correctness of the entries in the special_jvm_flags table.
678 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
679 // version being earlier than the deprecation version, then a warning is issued
680 // and verification fails - by returning false. If it is detected that the table
681 // is out of date, with respect to the current version, then a warning is issued
682 // but verification does not fail. This allows the VM to operate when the version
683 // is first updated, without needing to update all the impacted flags at the
684 // same time.
685 static bool verify_special_jvm_flags() {
686 bool success = true;
687 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
688 const SpecialFlag& flag = special_jvm_flags[i];
689 if (lookup_special_flag(flag.name, i)) {
690 warning("Duplicate special flag declaration \"%s\"", flag.name);
691 success = false;
692 }
693 if (flag.deprecated_in.is_undefined() &&
694 flag.obsolete_in.is_undefined()) {
695 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
696 success = false;
697 }
698
699 if (!flag.deprecated_in.is_undefined()) {
700 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
701 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
702 success = false;
703 }
704
705 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
706 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
707 success = false;
708 }
709 }
710
711 if (!flag.obsolete_in.is_undefined()) {
712 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
713 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
714 success = false;
715 }
716
717 // if flag has become obsolete it should not have a "globals" flag defined anymore.
718 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
719 if (Flag::find_flag(flag.name) != NULL) {
720 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
721 }
722 }
723 }
724
725 if (!flag.expired_in.is_undefined()) {
726 // if flag has become expired it should not have a "globals" flag defined anymore.
727 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
728 if (Flag::find_flag(flag.name) != NULL) {
729 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
730 }
731 }
732 }
733
734 }
735 return success;
736 }
737 #endif
738
739 // Parses a size specification string.
740 bool Arguments::atojulong(const char *s, julong* result) {
741 julong n = 0;
742
743 // First char must be a digit. Don't allow negative numbers or leading spaces.
744 if (!isdigit(*s)) {
745 return false;
746 }
747
748 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
749 char* remainder;
750 errno = 0;
751 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
752 if (errno != 0) {
753 return false;
754 }
755
756 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
757 if (remainder == s || strlen(remainder) > 1) {
758 return false;
759 }
760
761 switch (*remainder) {
762 case 'T': case 't':
763 *result = n * G * K;
764 // Check for overflow.
765 if (*result/((julong)G * K) != n) return false;
766 return true;
767 case 'G': case 'g':
768 *result = n * G;
769 if (*result/G != n) return false;
770 return true;
771 case 'M': case 'm':
772 *result = n * M;
773 if (*result/M != n) return false;
774 return true;
775 case 'K': case 'k':
776 *result = n * K;
777 if (*result/K != n) return false;
778 return true;
779 case '\0':
780 *result = n;
781 return true;
782 default:
783 return false;
784 }
785 }
786
787 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
788 if (size < min_size) return arg_too_small;
789 if (size > max_size) return arg_too_big;
790 return arg_in_range;
791 }
792
793 // Describe an argument out of range error
794 void Arguments::describe_range_error(ArgsRange errcode) {
795 switch(errcode) {
796 case arg_too_big:
797 jio_fprintf(defaultStream::error_stream(),
798 "The specified size exceeds the maximum "
799 "representable size.\n");
800 break;
801 case arg_too_small:
802 case arg_unreadable:
803 case arg_in_range:
804 // do nothing for now
805 break;
806 default:
807 ShouldNotReachHere();
808 }
809 }
810
811 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
812 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
813 return true;
814 } else {
815 return false;
816 }
817 }
818
819 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
820 char* end;
821 errno = 0;
822 double v = strtod(value, &end);
823 if ((errno != 0) || (*end != 0)) {
824 return false;
825 }
826
827 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
828 return true;
829 }
830 return false;
831 }
832
833 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
834 julong v;
835 int int_v;
836 intx intx_v;
837 bool is_neg = false;
838 Flag* result = Flag::find_flag(name, strlen(name));
839
840 if (result == NULL) {
841 return false;
842 }
843
844 // Check the sign first since atojulong() parses only unsigned values.
845 if (*value == '-') {
846 if (!result->is_intx() && !result->is_int()) {
847 return false;
848 }
849 value++;
850 is_neg = true;
851 }
852 if (!Arguments::atojulong(value, &v)) {
853 return false;
854 }
855 if (result->is_int()) {
856 int_v = (int) v;
857 if (is_neg) {
858 int_v = -int_v;
859 }
860 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
861 } else if (result->is_uint()) {
862 uint uint_v = (uint) v;
863 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
864 } else if (result->is_intx()) {
865 intx_v = (intx) v;
866 if (is_neg) {
867 intx_v = -intx_v;
868 }
869 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
870 } else if (result->is_uintx()) {
871 uintx uintx_v = (uintx) v;
872 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
873 } else if (result->is_uint64_t()) {
874 uint64_t uint64_t_v = (uint64_t) v;
875 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
876 } else if (result->is_size_t()) {
877 size_t size_t_v = (size_t) v;
878 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
879 } else if (result->is_double()) {
880 double double_v = (double) v;
881 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
882 } else {
883 return false;
884 }
885 }
886
887 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
888 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
889 // Contract: CommandLineFlags always returns a pointer that needs freeing.
890 FREE_C_HEAP_ARRAY(char, value);
891 return true;
892 }
893
894 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
895 const char* old_value = "";
896 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
897 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
898 size_t new_len = strlen(new_value);
899 const char* value;
900 char* free_this_too = NULL;
901 if (old_len == 0) {
902 value = new_value;
903 } else if (new_len == 0) {
904 value = old_value;
905 } else {
906 size_t length = old_len + 1 + new_len + 1;
907 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
908 // each new setting adds another LINE to the switch:
909 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
910 value = buf;
911 free_this_too = buf;
912 }
913 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
914 // CommandLineFlags always returns a pointer that needs freeing.
915 FREE_C_HEAP_ARRAY(char, value);
916 if (free_this_too != NULL) {
917 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
918 FREE_C_HEAP_ARRAY(char, free_this_too);
919 }
920 return true;
921 }
922
923 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
924 const char* real_name = real_flag_name(arg);
925 JDK_Version since = JDK_Version();
926 switch (is_deprecated_flag(arg, &since)) {
927 case -1:
928 return NULL; // obsolete or expired, don't process normally
929 case 0:
930 return real_name;
931 case 1: {
932 if (warn) {
933 char version[256];
934 since.to_string(version, sizeof(version));
935 if (real_name != arg) {
936 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
937 arg, version, real_name);
938 } else {
939 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
940 arg, version);
941 }
942 }
943 return real_name;
944 }
945 }
946 ShouldNotReachHere();
947 return NULL;
948 }
949
950 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
951 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
952 // Set tagset string buffer at max size of 256, large enough for any alias tagset
953 const int max_tagset_size = 256;
954 int max_tagset_len = max_tagset_size - 1;
955 char tagset_buffer[max_tagset_size];
956 tagset_buffer[0] = '\0';
957
958 // Write tag-set for aliased logging option, in string list form
959 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
960 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
961 if (i > 0) {
962 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
963 }
964 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
965 }
966 if (!alf.exactMatch) {
967 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
968 }
969 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
970 (on) ? "+" : "-",
971 name,
972 tagset_buffer,
973 (on) ? LogLevel::name(alf.level) : "off");
974 }
975
976 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
977 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
978 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
979 if (strcmp(alf.alias_name, name) == 0) {
980 log_deprecated_flag(name, on, alf);
981 return alf;
982 }
983 }
984 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
985 return a;
986 }
987
988 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
989
990 // range of acceptable characters spelled out for portability reasons
991 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
992 #define BUFLEN 255
993 char name[BUFLEN+1];
994 char dummy;
995 const char* real_name;
996 bool warn_if_deprecated = true;
997
998 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
999 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1000 if (alf.alias_name != NULL){
1001 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1002 return true;
1003 }
1004 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1005 if (real_name == NULL) {
1006 return false;
1007 }
1008 return set_bool_flag(real_name, false, origin);
1009 }
1010 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1011 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1012 if (alf.alias_name != NULL){
1013 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1014 return true;
1015 }
1016 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1017 if (real_name == NULL) {
1018 return false;
1019 }
1020 return set_bool_flag(real_name, true, origin);
1021 }
1022
1023 char punct;
1024 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1025 const char* value = strchr(arg, '=') + 1;
1026 Flag* flag;
1027
1028 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1029 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1030 if (alf.alias_name != NULL) {
1031 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1032 return true;
1033 }
1034 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1035 if (real_name == NULL) {
1036 return false;
1037 }
1038 flag = Flag::find_flag(real_name);
1039 if (flag != NULL && flag->is_ccstr()) {
1040 if (flag->ccstr_accumulates()) {
1041 return append_to_string_flag(real_name, value, origin);
1042 } else {
1043 if (value[0] == '\0') {
1044 value = NULL;
1045 }
1046 return set_string_flag(real_name, value, origin);
1047 }
1048 } else {
1049 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1050 }
1051 }
1052
1053 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1054 const char* value = strchr(arg, '=') + 1;
1055 // -XX:Foo:=xxx will reset the string flag to the given value.
1056 if (value[0] == '\0') {
1057 value = NULL;
1058 }
1059 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1060 if (real_name == NULL) {
1061 return false;
1062 }
1063 return set_string_flag(real_name, value, origin);
1064 }
1065
1066 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1067 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1068 #define NUMBER_RANGE "[0123456789eE+-]"
1069 char value[BUFLEN + 1];
1070 char value2[BUFLEN + 1];
1071 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1072 // Looks like a floating-point number -- try again with more lenient format string
1073 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1074 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1075 if (real_name == NULL) {
1076 return false;
1077 }
1078 return set_fp_numeric_flag(real_name, value, origin);
1079 }
1080 }
1081
1082 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1083 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1084 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1085 if (real_name == NULL) {
1086 return false;
1087 }
1088 return set_numeric_flag(real_name, value, origin);
1089 }
1090
1091 return false;
1092 }
1093
1094 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1095 assert(bldarray != NULL, "illegal argument");
1096
1097 if (arg == NULL) {
1098 return;
1099 }
1100
1101 int new_count = *count + 1;
1102
1103 // expand the array and add arg to the last element
1104 if (*bldarray == NULL) {
1105 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1106 } else {
1107 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1108 }
1109 (*bldarray)[*count] = os::strdup_check_oom(arg);
1110 *count = new_count;
1111 }
1112
1113 void Arguments::build_jvm_args(const char* arg) {
1114 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1115 }
1116
1117 void Arguments::build_jvm_flags(const char* arg) {
1118 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1119 }
1120
1121 // utility function to return a string that concatenates all
1122 // strings in a given char** array
1123 const char* Arguments::build_resource_string(char** args, int count) {
1124 if (args == NULL || count == 0) {
1125 return NULL;
1126 }
1127 size_t length = 0;
1128 for (int i = 0; i < count; i++) {
1129 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1130 }
1131 char* s = NEW_RESOURCE_ARRAY(char, length);
1132 char* dst = s;
1133 for (int j = 0; j < count; j++) {
1134 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1135 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1136 dst += offset;
1137 length -= offset;
1138 }
1139 return (const char*) s;
1140 }
1141
1142 void Arguments::print_on(outputStream* st) {
1143 st->print_cr("VM Arguments:");
1144 if (num_jvm_flags() > 0) {
1145 st->print("jvm_flags: "); print_jvm_flags_on(st);
1146 st->cr();
1147 }
1148 if (num_jvm_args() > 0) {
1149 st->print("jvm_args: "); print_jvm_args_on(st);
1150 st->cr();
1151 }
1152 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1153 if (_java_class_path != NULL) {
1154 char* path = _java_class_path->value();
1155 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1156 }
1157 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1158 }
1159
1160 void Arguments::print_summary_on(outputStream* st) {
1161 // Print the command line. Environment variables that are helpful for
1162 // reproducing the problem are written later in the hs_err file.
1163 // flags are from setting file
1164 if (num_jvm_flags() > 0) {
1165 st->print_raw("Settings File: ");
1166 print_jvm_flags_on(st);
1167 st->cr();
1168 }
1169 // args are the command line and environment variable arguments.
1170 st->print_raw("Command Line: ");
1171 if (num_jvm_args() > 0) {
1172 print_jvm_args_on(st);
1173 }
1174 // this is the classfile and any arguments to the java program
1175 if (java_command() != NULL) {
1176 st->print("%s", java_command());
1177 }
1178 st->cr();
1179 }
1180
1181 void Arguments::print_jvm_flags_on(outputStream* st) {
1182 if (_num_jvm_flags > 0) {
1183 for (int i=0; i < _num_jvm_flags; i++) {
1184 st->print("%s ", _jvm_flags_array[i]);
1185 }
1186 }
1187 }
1188
1189 void Arguments::print_jvm_args_on(outputStream* st) {
1190 if (_num_jvm_args > 0) {
1191 for (int i=0; i < _num_jvm_args; i++) {
1192 st->print("%s ", _jvm_args_array[i]);
1193 }
1194 }
1195 }
1196
1197 bool Arguments::process_argument(const char* arg,
1198 jboolean ignore_unrecognized,
1199 Flag::Flags origin) {
1200 JDK_Version since = JDK_Version();
1201
1202 if (parse_argument(arg, origin)) {
1203 return true;
1204 }
1205
1206 // Determine if the flag has '+', '-', or '=' characters.
1207 bool has_plus_minus = (*arg == '+' || *arg == '-');
1208 const char* const argname = has_plus_minus ? arg + 1 : arg;
1209
1210 size_t arg_len;
1211 const char* equal_sign = strchr(argname, '=');
1212 if (equal_sign == NULL) {
1213 arg_len = strlen(argname);
1214 } else {
1215 arg_len = equal_sign - argname;
1216 }
1217
1218 // Only make the obsolete check for valid arguments.
1219 if (arg_len <= BUFLEN) {
1220 // Construct a string which consists only of the argument name without '+', '-', or '='.
1221 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1222 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1223 if (is_obsolete_flag(stripped_argname, &since)) {
1224 char version[256];
1225 since.to_string(version, sizeof(version));
1226 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1227 return true;
1228 }
1229 #ifndef PRODUCT
1230 else {
1231 const char* replacement;
1232 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1233 log_warning(arguments)("%s has been removed. Please use %s instead.",
1234 stripped_argname,
1235 replacement);
1236 return false;
1237 }
1238 }
1239 #endif //PRODUCT
1240 }
1241
1242 // For locked flags, report a custom error message if available.
1243 // Otherwise, report the standard unrecognized VM option.
1244 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1245 if (found_flag != NULL) {
1246 char locked_message_buf[BUFLEN];
1247 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1248 if (strlen(locked_message_buf) == 0) {
1249 if (found_flag->is_bool() && !has_plus_minus) {
1250 jio_fprintf(defaultStream::error_stream(),
1251 "Missing +/- setting for VM option '%s'\n", argname);
1252 } else if (!found_flag->is_bool() && has_plus_minus) {
1253 jio_fprintf(defaultStream::error_stream(),
1254 "Unexpected +/- setting in VM option '%s'\n", argname);
1255 } else {
1256 jio_fprintf(defaultStream::error_stream(),
1257 "Improperly specified VM option '%s'\n", argname);
1258 }
1259 } else {
1260 #ifdef PRODUCT
1261 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1262 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1263 if (ignore_unrecognized && mismatched) {
1264 return true;
1265 }
1266 #endif
1267 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1268 }
1269 } else {
1270 if (ignore_unrecognized) {
1271 return true;
1272 }
1273 jio_fprintf(defaultStream::error_stream(),
1274 "Unrecognized VM option '%s'\n", argname);
1275 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1276 if (fuzzy_matched != NULL) {
1277 jio_fprintf(defaultStream::error_stream(),
1278 "Did you mean '%s%s%s'? ",
1279 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1280 fuzzy_matched->_name,
1281 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1282 }
1283 }
1284
1285 // allow for commandline "commenting out" options like -XX:#+Verbose
1286 return arg[0] == '#';
1287 }
1288
1289 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1290 FILE* stream = fopen(file_name, "rb");
1291 if (stream == NULL) {
1292 if (should_exist) {
1293 jio_fprintf(defaultStream::error_stream(),
1294 "Could not open settings file %s\n", file_name);
1295 return false;
1296 } else {
1297 return true;
1298 }
1299 }
1300
1301 char token[1024];
1302 int pos = 0;
1303
1304 bool in_white_space = true;
1305 bool in_comment = false;
1306 bool in_quote = false;
1307 char quote_c = 0;
1308 bool result = true;
1309
1310 int c = getc(stream);
1311 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1312 if (in_white_space) {
1313 if (in_comment) {
1314 if (c == '\n') in_comment = false;
1315 } else {
1316 if (c == '#') in_comment = true;
1317 else if (!isspace(c)) {
1318 in_white_space = false;
1319 token[pos++] = c;
1320 }
1321 }
1322 } else {
1323 if (c == '\n' || (!in_quote && isspace(c))) {
1324 // token ends at newline, or at unquoted whitespace
1325 // this allows a way to include spaces in string-valued options
1326 token[pos] = '\0';
1327 logOption(token);
1328 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1329 build_jvm_flags(token);
1330 pos = 0;
1331 in_white_space = true;
1332 in_quote = false;
1333 } else if (!in_quote && (c == '\'' || c == '"')) {
1334 in_quote = true;
1335 quote_c = c;
1336 } else if (in_quote && (c == quote_c)) {
1337 in_quote = false;
1338 } else {
1339 token[pos++] = c;
1340 }
1341 }
1342 c = getc(stream);
1343 }
1344 if (pos > 0) {
1345 token[pos] = '\0';
1346 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1347 build_jvm_flags(token);
1348 }
1349 fclose(stream);
1350 return result;
1351 }
1352
1353 //=============================================================================================================
1354 // Parsing of properties (-D)
1355
1356 const char* Arguments::get_property(const char* key) {
1357 return PropertyList_get_value(system_properties(), key);
1358 }
1359
1360 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1361 const char* eq = strchr(prop, '=');
1362 const char* key;
1363 const char* value = "";
1364
1365 if (eq == NULL) {
1366 // property doesn't have a value, thus use passed string
1367 key = prop;
1368 } else {
1369 // property have a value, thus extract it and save to the
1370 // allocated string
1371 size_t key_len = eq - prop;
1372 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1373
1374 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1375 key = tmp_key;
1376
1377 value = &prop[key_len + 1];
1378 }
1379
1380 if (strcmp(key, "java.compiler") == 0) {
1381 process_java_compiler_argument(value);
1382 // Record value in Arguments, but let it get passed to Java.
1383 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1384 strcmp(key, "sun.java.launcher.pid") == 0) {
1385 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1386 // private and are processed in process_sun_java_launcher_properties();
1387 // the sun.java.launcher property is passed on to the java application
1388 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1389 // append is true, writable is true, internal is false
1390 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1391 WriteableProperty, ExternalProperty);
1392 } else {
1393 if (strcmp(key, "sun.java.command") == 0) {
1394 char *old_java_command = _java_command;
1395 _java_command = os::strdup_check_oom(value, mtArguments);
1396 if (old_java_command != NULL) {
1397 os::free(old_java_command);
1398 }
1399 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1400 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1401 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1402 // its value without going through the property list or making a Java call.
1403 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1404 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1405 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1406 os::free((void *)old_java_vendor_url_bug);
1407 }
1408 }
1409
1410 // Create new property and add at the end of the list
1411 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1412 }
1413
1414 if (key != prop) {
1415 // SystemProperty copy passed value, thus free previously allocated
1416 // memory
1417 FreeHeap((void *)key);
1418 }
1419
1420 return true;
1421 }
1422
1423 #if INCLUDE_CDS
1424 void Arguments::check_unsupported_dumping_properties() {
1425 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1426 const char* unsupported_properties[] = { "jdk.module.main",
1427 "jdk.module.limitmods",
1428 "jdk.module.path",
1429 "jdk.module.upgrade.path",
1430 "jdk.module.patch.0" };
1431 const char* unsupported_options[] = { "-m", // cannot use at dump time
1432 "--limit-modules", // ignored at dump time
1433 "--module-path", // ignored at dump time
1434 "--upgrade-module-path", // ignored at dump time
1435 "--patch-module" // ignored at dump time
1436 };
1437 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1438 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1439 // vm will exit with an error message. Otherwise, it will print an informational message if
1440 // -Xlog:cds is enabled.
1441 uint info_idx = 1;
1442 SystemProperty* sp = system_properties();
1443 while (sp != NULL) {
1444 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1445 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1446 if (i < info_idx) {
1447 vm_exit_during_initialization(
1448 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1449 } else {
1450 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1451 unsupported_options[i]);
1452 }
1453 }
1454 }
1455 sp = sp->next();
1456 }
1457
1458 // Check for an exploded module build in use with -Xshare:dump.
1459 if (!has_jimage()) {
1460 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1461 }
1462 }
1463 #endif
1464
1465 //===========================================================================================================
1466 // Setting int/mixed/comp mode flags
1467
1468 void Arguments::set_mode_flags(Mode mode) {
1469 // Set up default values for all flags.
1470 // If you add a flag to any of the branches below,
1471 // add a default value for it here.
1472 set_java_compiler(false);
1473 _mode = mode;
1474
1475 // Ensure Agent_OnLoad has the correct initial values.
1476 // This may not be the final mode; mode may change later in onload phase.
1477 PropertyList_unique_add(&_system_properties, "java.vm.info",
1478 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1479
1480 UseInterpreter = true;
1481 UseCompiler = true;
1482 UseLoopCounter = true;
1483
1484 // Default values may be platform/compiler dependent -
1485 // use the saved values
1486 ClipInlining = Arguments::_ClipInlining;
1487 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1488 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1489 BackgroundCompilation = Arguments::_BackgroundCompilation;
1490 if (TieredCompilation) {
1491 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1492 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1493 }
1494 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1495 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1496 }
1497 }
1498
1499 // Change from defaults based on mode
1500 switch (mode) {
1501 default:
1502 ShouldNotReachHere();
1503 break;
1504 case _int:
1505 UseCompiler = false;
1506 UseLoopCounter = false;
1507 AlwaysCompileLoopMethods = false;
1508 UseOnStackReplacement = false;
1509 break;
1510 case _mixed:
1511 // same as default
1512 break;
1513 case _comp:
1514 UseInterpreter = false;
1515 BackgroundCompilation = false;
1516 ClipInlining = false;
1517 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1518 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1519 // compile a level 4 (C2) and then continue executing it.
1520 if (TieredCompilation) {
1521 Tier3InvokeNotifyFreqLog = 0;
1522 Tier4InvocationThreshold = 0;
1523 }
1524 break;
1525 }
1526 }
1527
1528 // Conflict: required to use shared spaces (-Xshare:on), but
1529 // incompatible command line options were chosen.
1530 static void no_shared_spaces(const char* message) {
1531 if (RequireSharedSpaces) {
1532 jio_fprintf(defaultStream::error_stream(),
1533 "Class data sharing is inconsistent with other specified options.\n");
1534 vm_exit_during_initialization("Unable to use shared archive.", message);
1535 } else {
1536 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1537 }
1538 }
1539
1540 // Returns threshold scaled with the value of scale.
1541 // If scale < 0.0, threshold is returned without scaling.
1542 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1543 if (scale == 1.0 || scale < 0.0) {
1544 return threshold;
1545 } else {
1546 return (intx)(threshold * scale);
1547 }
1548 }
1549
1550 // Returns freq_log scaled with the value of scale.
1551 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1552 // If scale < 0.0, freq_log is returned without scaling.
1553 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1554 // Check if scaling is necessary or if negative value was specified.
1555 if (scale == 1.0 || scale < 0.0) {
1556 return freq_log;
1557 }
1558 // Check values to avoid calculating log2 of 0.
1559 if (scale == 0.0 || freq_log == 0) {
1560 return 0;
1561 }
1562 // Determine the maximum notification frequency value currently supported.
1563 // The largest mask value that the interpreter/C1 can handle is
1564 // of length InvocationCounter::number_of_count_bits. Mask values are always
1565 // one bit shorter then the value of the notification frequency. Set
1566 // max_freq_bits accordingly.
1567 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1568 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1569 if (scaled_freq == 0) {
1570 // Return 0 right away to avoid calculating log2 of 0.
1571 return 0;
1572 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1573 return max_freq_bits;
1574 } else {
1575 return log2_intptr(scaled_freq);
1576 }
1577 }
1578
1579 void Arguments::set_tiered_flags() {
1580 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1581 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1582 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1583 }
1584 if (CompilationPolicyChoice < 2) {
1585 vm_exit_during_initialization(
1586 "Incompatible compilation policy selected", NULL);
1587 }
1588 // Increase the code cache size - tiered compiles a lot more.
1589 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1590 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1591 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1592 }
1593 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1594 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1595 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1596 }
1597 if (!UseInterpreter) { // -Xcomp
1598 Tier3InvokeNotifyFreqLog = 0;
1599 Tier4InvocationThreshold = 0;
1600 }
1601
1602 if (CompileThresholdScaling < 0) {
1603 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1604 }
1605
1606 // Scale tiered compilation thresholds.
1607 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1608 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1609 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1610 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1611
1612 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1613 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1614 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1615 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1616
1617 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1618 // once these thresholds become supported.
1619
1620 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1621 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1622
1623 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1624 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1625
1626 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1627
1628 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1629 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1630 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1631 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1632 }
1633 }
1634
1635 void set_object_alignment() {
1636 // Object alignment.
1637 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1638 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1639 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1640 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1641 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1642 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1643
1644 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1645 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1646
1647 // Oop encoding heap max
1648 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1649
1650 if (SurvivorAlignmentInBytes == 0) {
1651 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1652 }
1653 }
1654
1655 size_t Arguments::max_heap_for_compressed_oops() {
1656 // Avoid sign flip.
1657 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1658 // We need to fit both the NULL page and the heap into the memory budget, while
1659 // keeping alignment constraints of the heap. To guarantee the latter, as the
1660 // NULL page is located before the heap, we pad the NULL page to the conservative
1661 // maximum alignment that the GC may ever impose upon the heap.
1662 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1663 _conservative_max_heap_alignment);
1664
1665 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1666 NOT_LP64(ShouldNotReachHere(); return 0);
1667 }
1668
1669 void Arguments::set_use_compressed_oops() {
1670 #ifndef ZERO
1671 #ifdef _LP64
1672 // MaxHeapSize is not set up properly at this point, but
1673 // the only value that can override MaxHeapSize if we are
1674 // to use UseCompressedOops is InitialHeapSize.
1675 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1676
1677 if (max_heap_size <= max_heap_for_compressed_oops()) {
1678 #if !defined(COMPILER1) || defined(TIERED)
1679 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1680 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1681 }
1682 #endif
1683 } else {
1684 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1685 warning("Max heap size too large for Compressed Oops");
1686 FLAG_SET_DEFAULT(UseCompressedOops, false);
1687 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1688 }
1689 }
1690 #endif // _LP64
1691 #endif // ZERO
1692 }
1693
1694
1695 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1696 // set_use_compressed_oops().
1697 void Arguments::set_use_compressed_klass_ptrs() {
1698 #ifndef ZERO
1699 #ifdef _LP64
1700 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1701 if (!UseCompressedOops) {
1702 if (UseCompressedClassPointers) {
1703 warning("UseCompressedClassPointers requires UseCompressedOops");
1704 }
1705 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1706 } else {
1707 // Turn on UseCompressedClassPointers too
1708 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1709 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1710 }
1711 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1712 if (UseCompressedClassPointers) {
1713 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1714 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1715 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1716 }
1717 }
1718 }
1719 #endif // _LP64
1720 #endif // !ZERO
1721 }
1722
1723 void Arguments::set_conservative_max_heap_alignment() {
1724 // The conservative maximum required alignment for the heap is the maximum of
1725 // the alignments imposed by several sources: any requirements from the heap
1726 // itself, the collector policy and the maximum page size we may run the VM
1727 // with.
1728 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1729 _conservative_max_heap_alignment = MAX4(heap_alignment,
1730 (size_t)os::vm_allocation_granularity(),
1731 os::max_page_size(),
1732 CollectorPolicy::compute_heap_alignment());
1733 }
1734
1735 #ifdef TIERED
1736 bool Arguments::compilation_mode_selected() {
1737 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1738 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1739
1740 }
1741
1742 void Arguments::select_compilation_mode_ergonomically() {
1743 #if defined(_WINDOWS) && !defined(_LP64)
1744 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1745 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1746 }
1747 #endif
1748 if (NeverActAsServerClassMachine) {
1749 set_client_compilation_mode();
1750 }
1751 }
1752 #endif //TIERED
1753
1754 #if INCLUDE_JVMCI
1755 void Arguments::set_jvmci_specific_flags() {
1756 if (UseJVMCICompiler) {
1757 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1758 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1759 }
1760 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1761 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1762 }
1763 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1764 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1765 }
1766 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1767 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1768 }
1769 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1770 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1771 }
1772 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1773 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1774 }
1775 if (TieredStopAtLevel != CompLevel_full_optimization) {
1776 // Currently JVMCI compiler can only work at the full optimization level
1777 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1778 TieredStopAtLevel = CompLevel_full_optimization;
1779 }
1780 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1781 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1782 }
1783 }
1784 }
1785 #endif
1786
1787 jint Arguments::set_ergonomics_flags() {
1788 #ifdef TIERED
1789 if (!compilation_mode_selected()) {
1790 select_compilation_mode_ergonomically();
1791 }
1792 #endif
1793
1794 jint gc_result = GCArguments::initialize();
1795 if (gc_result != JNI_OK) {
1796 return gc_result;
1797 }
1798
1799 #if COMPILER2_OR_JVMCI
1800 // Shared spaces work fine with other GCs but causes bytecode rewriting
1801 // to be disabled, which hurts interpreter performance and decreases
1802 // server performance. When -server is specified, keep the default off
1803 // unless it is asked for. Future work: either add bytecode rewriting
1804 // at link time, or rewrite bytecodes in non-shared methods.
1805 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1806 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1807 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1808 }
1809 #endif
1810
1811 set_conservative_max_heap_alignment();
1812
1813 #ifndef ZERO
1814 #ifdef _LP64
1815 set_use_compressed_oops();
1816
1817 // set_use_compressed_klass_ptrs() must be called after calling
1818 // set_use_compressed_oops().
1819 set_use_compressed_klass_ptrs();
1820
1821 // Also checks that certain machines are slower with compressed oops
1822 // in vm_version initialization code.
1823 #endif // _LP64
1824 #endif // !ZERO
1825
1826 return JNI_OK;
1827 }
1828
1829 void Arguments::set_gc_specific_flags() {
1830 // Set GC flags
1831 GCArguments::arguments()->initialize_flags();
1832 }
1833
1834 julong Arguments::limit_by_allocatable_memory(julong limit) {
1835 julong max_allocatable;
1836 julong result = limit;
1837 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1838 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1839 }
1840 return result;
1841 }
1842
1843 // Use static initialization to get the default before parsing
1844 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1845
1846 void Arguments::set_heap_size() {
1847 julong phys_mem =
1848 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1849 : (julong)MaxRAM;
1850
1851 // Experimental support for CGroup memory limits
1852 if (UseCGroupMemoryLimitForHeap) {
1853 // This is a rough indicator that a CGroup limit may be in force
1854 // for this process
1855 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1856 FILE *fp = fopen(lim_file, "r");
1857 if (fp != NULL) {
1858 julong cgroup_max = 0;
1859 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1860 if (ret == 1 && cgroup_max > 0) {
1861 // If unlimited, cgroup_max will be a very large, but unspecified
1862 // value, so use initial phys_mem as a limit
1863 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1864 JULONG_FORMAT "MB) and initial phys_mem ("
1865 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1866 phys_mem = MIN2(cgroup_max, phys_mem);
1867 } else {
1868 warning("Unable to read/parse cgroup memory limit from %s: %s",
1869 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1870 }
1871 fclose(fp);
1872 } else {
1873 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1874 }
1875 }
1876
1877 // Convert deprecated flags
1878 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1879 !FLAG_IS_DEFAULT(MaxRAMFraction))
1880 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1881
1882 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1883 !FLAG_IS_DEFAULT(MinRAMFraction))
1884 MinRAMPercentage = 100.0 / MinRAMFraction;
1885
1886 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1887 !FLAG_IS_DEFAULT(InitialRAMFraction))
1888 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1889
1890 // If the maximum heap size has not been set with -Xmx,
1891 // then set it as fraction of the size of physical memory,
1892 // respecting the maximum and minimum sizes of the heap.
1893 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1894 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1895 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1896 if (reasonable_min < MaxHeapSize) {
1897 // Small physical memory, so use a minimum fraction of it for the heap
1898 reasonable_max = reasonable_min;
1899 } else {
1900 // Not-small physical memory, so require a heap at least
1901 // as large as MaxHeapSize
1902 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1903 }
1904
1905 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1906 // Limit the heap size to ErgoHeapSizeLimit
1907 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1908 }
1909 if (UseCompressedOops) {
1910 // Limit the heap size to the maximum possible when using compressed oops
1911 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1912
1913 // HeapBaseMinAddress can be greater than default but not less than.
1914 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1915 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1916 // matches compressed oops printing flags
1917 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1918 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1919 DefaultHeapBaseMinAddress,
1920 DefaultHeapBaseMinAddress/G,
1921 HeapBaseMinAddress);
1922 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1923 }
1924 }
1925
1926 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1927 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1928 // but it should be not less than default MaxHeapSize.
1929 max_coop_heap -= HeapBaseMinAddress;
1930 }
1931 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1932 }
1933 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1934
1935 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1936 // An initial heap size was specified on the command line,
1937 // so be sure that the maximum size is consistent. Done
1938 // after call to limit_by_allocatable_memory because that
1939 // method might reduce the allocation size.
1940 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1941 }
1942
1943 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1944 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1945 }
1946
1947 // If the minimum or initial heap_size have not been set or requested to be set
1948 // ergonomically, set them accordingly.
1949 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1950 julong reasonable_minimum = (julong)(OldSize + NewSize);
1951
1952 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1953
1954 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1955
1956 if (InitialHeapSize == 0) {
1957 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1958
1959 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1960 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1961
1962 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1963
1964 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1965 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1966 }
1967 // If the minimum heap size has not been set (via -Xms),
1968 // synchronize with InitialHeapSize to avoid errors with the default value.
1969 if (min_heap_size() == 0) {
1970 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1971 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1972 }
1973 }
1974 }
1975
1976 // This option inspects the machine and attempts to set various
1977 // parameters to be optimal for long-running, memory allocation
1978 // intensive jobs. It is intended for machines with large
1979 // amounts of cpu and memory.
1980 jint Arguments::set_aggressive_heap_flags() {
1981 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1982 // VM, but we may not be able to represent the total physical memory
1983 // available (like having 8gb of memory on a box but using a 32bit VM).
1984 // Thus, we need to make sure we're using a julong for intermediate
1985 // calculations.
1986 julong initHeapSize;
1987 julong total_memory = os::physical_memory();
1988
1989 if (total_memory < (julong) 256 * M) {
1990 jio_fprintf(defaultStream::error_stream(),
1991 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1992 vm_exit(1);
1993 }
1994
1995 // The heap size is half of available memory, or (at most)
1996 // all of possible memory less 160mb (leaving room for the OS
1997 // when using ISM). This is the maximum; because adaptive sizing
1998 // is turned on below, the actual space used may be smaller.
1999
2000 initHeapSize = MIN2(total_memory / (julong) 2,
2001 total_memory - (julong) 160 * M);
2002
2003 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2004
2005 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2006 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2007 return JNI_EINVAL;
2008 }
2009 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2010 return JNI_EINVAL;
2011 }
2012 // Currently the minimum size and the initial heap sizes are the same.
2013 set_min_heap_size(initHeapSize);
2014 }
2015 if (FLAG_IS_DEFAULT(NewSize)) {
2016 // Make the young generation 3/8ths of the total heap.
2017 if (FLAG_SET_CMDLINE(size_t, NewSize,
2018 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2019 return JNI_EINVAL;
2020 }
2021 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2022 return JNI_EINVAL;
2023 }
2024 }
2025
2026 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2027 FLAG_SET_DEFAULT(UseLargePages, true);
2028 #endif
2029
2030 // Increase some data structure sizes for efficiency
2031 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2032 return JNI_EINVAL;
2033 }
2034 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2035 return JNI_EINVAL;
2036 }
2037 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2038 return JNI_EINVAL;
2039 }
2040
2041 // See the OldPLABSize comment below, but replace 'after promotion'
2042 // with 'after copying'. YoungPLABSize is the size of the survivor
2043 // space per-gc-thread buffers. The default is 4kw.
2044 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2045 return JNI_EINVAL;
2046 }
2047
2048 // OldPLABSize is the size of the buffers in the old gen that
2049 // UseParallelGC uses to promote live data that doesn't fit in the
2050 // survivor spaces. At any given time, there's one for each gc thread.
2051 // The default size is 1kw. These buffers are rarely used, since the
2052 // survivor spaces are usually big enough. For specjbb, however, there
2053 // are occasions when there's lots of live data in the young gen
2054 // and we end up promoting some of it. We don't have a definite
2055 // explanation for why bumping OldPLABSize helps, but the theory
2056 // is that a bigger PLAB results in retaining something like the
2057 // original allocation order after promotion, which improves mutator
2058 // locality. A minor effect may be that larger PLABs reduce the
2059 // number of PLAB allocation events during gc. The value of 8kw
2060 // was arrived at by experimenting with specjbb.
2061 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2062 return JNI_EINVAL;
2063 }
2064
2065 // Enable parallel GC and adaptive generation sizing
2066 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2067 return JNI_EINVAL;
2068 }
2069
2070 // Encourage steady state memory management
2071 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2072 return JNI_EINVAL;
2073 }
2074
2075 // This appears to improve mutator locality
2076 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2077 return JNI_EINVAL;
2078 }
2079
2080 // Get around early Solaris scheduling bug
2081 // (affinity vs other jobs on system)
2082 // but disallow DR and offlining (5008695).
2083 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2084 return JNI_EINVAL;
2085 }
2086
2087 return JNI_OK;
2088 }
2089
2090 // This must be called after ergonomics.
2091 void Arguments::set_bytecode_flags() {
2092 if (!RewriteBytecodes) {
2093 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2094 }
2095 }
2096
2097 // Aggressive optimization flags -XX:+AggressiveOpts
2098 jint Arguments::set_aggressive_opts_flags() {
2099 #ifdef COMPILER2
2100 if (AggressiveUnboxing) {
2101 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2102 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2103 } else if (!EliminateAutoBox) {
2104 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2105 AggressiveUnboxing = false;
2106 }
2107 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2108 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2109 } else if (!DoEscapeAnalysis) {
2110 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2111 AggressiveUnboxing = false;
2112 }
2113 }
2114 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2115 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2116 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2117 }
2118 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2119 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2120 }
2121
2122 // Feed the cache size setting into the JDK
2123 char buffer[1024];
2124 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2125 if (!add_property(buffer)) {
2126 return JNI_ENOMEM;
2127 }
2128 }
2129 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2130 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2131 }
2132 #endif
2133
2134 if (AggressiveOpts) {
2135 // Sample flag setting code
2136 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2137 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2138 // }
2139 }
2140
2141 return JNI_OK;
2142 }
2143
2144 //===========================================================================================================
2145 // Parsing of java.compiler property
2146
2147 void Arguments::process_java_compiler_argument(const char* arg) {
2148 // For backwards compatibility, Djava.compiler=NONE or ""
2149 // causes us to switch to -Xint mode UNLESS -Xdebug
2150 // is also specified.
2151 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2152 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2153 }
2154 }
2155
2156 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2157 _sun_java_launcher = os::strdup_check_oom(launcher);
2158 }
2159
2160 bool Arguments::created_by_java_launcher() {
2161 assert(_sun_java_launcher != NULL, "property must have value");
2162 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2163 }
2164
2165 bool Arguments::sun_java_launcher_is_altjvm() {
2166 return _sun_java_launcher_is_altjvm;
2167 }
2168
2169 //===========================================================================================================
2170 // Parsing of main arguments
2171
2172 #if INCLUDE_JVMCI
2173 // Check consistency of jvmci vm argument settings.
2174 bool Arguments::check_jvmci_args_consistency() {
2175 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2176 }
2177 #endif //INCLUDE_JVMCI
2178
2179 // Check consistency of GC selection
2180 bool Arguments::check_gc_consistency() {
2181 // Ensure that the user has not selected conflicting sets
2182 // of collectors.
2183 uint i = 0;
2184 if (UseSerialGC) i++;
2185 if (UseConcMarkSweepGC) i++;
2186 if (UseParallelGC || UseParallelOldGC) i++;
2187 if (UseG1GC) i++;
2188 if (i > 1) {
2189 jio_fprintf(defaultStream::error_stream(),
2190 "Conflicting collector combinations in option list; "
2191 "please refer to the release notes for the combinations "
2192 "allowed\n");
2193 return false;
2194 }
2195
2196 return true;
2197 }
2198
2199 // Check the consistency of vm_init_args
2200 bool Arguments::check_vm_args_consistency() {
2201 // Method for adding checks for flag consistency.
2202 // The intent is to warn the user of all possible conflicts,
2203 // before returning an error.
2204 // Note: Needs platform-dependent factoring.
2205 bool status = true;
2206
2207 if (TLABRefillWasteFraction == 0) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "TLABRefillWasteFraction should be a denominator, "
2210 "not " SIZE_FORMAT "\n",
2211 TLABRefillWasteFraction);
2212 status = false;
2213 }
2214
2215 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2216 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2217 }
2218
2219 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2220 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2221 }
2222
2223 if (GCTimeLimit == 100) {
2224 // Turn off gc-overhead-limit-exceeded checks
2225 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2226 }
2227
2228 status = status && check_gc_consistency();
2229
2230 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2231 // insists that we hold the requisite locks so that the iteration is
2232 // MT-safe. For the verification at start-up and shut-down, we don't
2233 // yet have a good way of acquiring and releasing these locks,
2234 // which are not visible at the CollectedHeap level. We want to
2235 // be able to acquire these locks and then do the iteration rather
2236 // than just disable the lock verification. This will be fixed under
2237 // bug 4788986.
2238 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2239 if (VerifyDuringStartup) {
2240 warning("Heap verification at start-up disabled "
2241 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2242 VerifyDuringStartup = false; // Disable verification at start-up
2243 }
2244
2245 if (VerifyBeforeExit) {
2246 warning("Heap verification at shutdown disabled "
2247 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2248 VerifyBeforeExit = false; // Disable verification at shutdown
2249 }
2250 }
2251
2252 if (PrintNMTStatistics) {
2253 #if INCLUDE_NMT
2254 if (MemTracker::tracking_level() == NMT_off) {
2255 #endif // INCLUDE_NMT
2256 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2257 PrintNMTStatistics = false;
2258 #if INCLUDE_NMT
2259 }
2260 #endif
2261 }
2262
2263 #if INCLUDE_JVMCI
2264 status = status && check_jvmci_args_consistency();
2265
2266 if (EnableJVMCI) {
2267 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2268 AddProperty, UnwriteableProperty, InternalProperty);
2269
2270 if (!ScavengeRootsInCode) {
2271 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2272 ScavengeRootsInCode = 1;
2273 }
2274 }
2275 #endif
2276
2277 // Check lower bounds of the code cache
2278 // Template Interpreter code is approximately 3X larger in debug builds.
2279 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2280 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2281 jio_fprintf(defaultStream::error_stream(),
2282 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2283 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2284 status = false;
2285 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2288 min_code_cache_size/K);
2289 status = false;
2290 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2291 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2292 jio_fprintf(defaultStream::error_stream(),
2293 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2294 CODE_CACHE_SIZE_LIMIT/M);
2295 status = false;
2296 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2297 jio_fprintf(defaultStream::error_stream(),
2298 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2299 min_code_cache_size/K);
2300 status = false;
2301 }
2302
2303 #ifdef _LP64
2304 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2305 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2306 }
2307 #endif
2308
2309 #ifndef SUPPORT_RESERVED_STACK_AREA
2310 if (StackReservedPages != 0) {
2311 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2312 warning("Reserved Stack Area not supported on this platform");
2313 }
2314 #endif
2315
2316 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2317 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2318 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2319 }
2320 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2321 }
2322 if (UseCompiler && is_interpreter_only()) {
2323 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2324 warning("UseCompiler disabled due to -Xint.");
2325 }
2326 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2327 }
2328 #ifdef COMPILER2
2329 if (PostLoopMultiversioning && !RangeCheckElimination) {
2330 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2331 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2332 }
2333 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2334 }
2335 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2336 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2337 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2338 }
2339 LoopStripMiningIter = 1;
2340 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2341 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2342 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2343 }
2344 LoopStripMiningIter = 0;
2345 }
2346 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2347 // blind guess
2348 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2349 }
2350 #endif
2351 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2352 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2353 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2354 }
2355 }
2356 return status;
2357 }
2358
2359 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2360 const char* option_type) {
2361 if (ignore) return false;
2362
2363 const char* spacer = " ";
2364 if (option_type == NULL) {
2365 option_type = ++spacer; // Set both to the empty string.
2366 }
2367
2368 if (os::obsolete_option(option)) {
2369 jio_fprintf(defaultStream::error_stream(),
2370 "Obsolete %s%soption: %s\n", option_type, spacer,
2371 option->optionString);
2372 return false;
2373 } else {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Unrecognized %s%soption: %s\n", option_type, spacer,
2376 option->optionString);
2377 return true;
2378 }
2379 }
2380
2381 static const char* user_assertion_options[] = {
2382 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2383 };
2384
2385 static const char* system_assertion_options[] = {
2386 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2387 };
2388
2389 bool Arguments::parse_uintx(const char* value,
2390 uintx* uintx_arg,
2391 uintx min_size) {
2392
2393 // Check the sign first since atojulong() parses only unsigned values.
2394 bool value_is_positive = !(*value == '-');
2395
2396 if (value_is_positive) {
2397 julong n;
2398 bool good_return = atojulong(value, &n);
2399 if (good_return) {
2400 bool above_minimum = n >= min_size;
2401 bool value_is_too_large = n > max_uintx;
2402
2403 if (above_minimum && !value_is_too_large) {
2404 *uintx_arg = n;
2405 return true;
2406 }
2407 }
2408 }
2409 return false;
2410 }
2411
2412 unsigned int addreads_count = 0;
2413 unsigned int addexports_count = 0;
2414 unsigned int addopens_count = 0;
2415 unsigned int addmods_count = 0;
2416 unsigned int patch_mod_count = 0;
2417
2418 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2419 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2420 char* property = AllocateHeap(prop_len, mtArguments);
2421 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2422 if (ret < 0 || ret >= (int)prop_len) {
2423 FreeHeap(property);
2424 return false;
2425 }
2426 bool added = add_property(property, UnwriteableProperty, internal);
2427 FreeHeap(property);
2428 return added;
2429 }
2430
2431 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2432 const unsigned int props_count_limit = 1000;
2433 const int max_digits = 3;
2434 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2435
2436 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2437 if (count < props_count_limit) {
2438 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2439 char* property = AllocateHeap(prop_len, mtArguments);
2440 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2441 if (ret < 0 || ret >= (int)prop_len) {
2442 FreeHeap(property);
2443 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2444 return false;
2445 }
2446 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2447 FreeHeap(property);
2448 return added;
2449 }
2450
2451 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2452 return false;
2453 }
2454
2455 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2456 julong* long_arg,
2457 julong min_size,
2458 julong max_size) {
2459 if (!atojulong(s, long_arg)) return arg_unreadable;
2460 return check_memory_size(*long_arg, min_size, max_size);
2461 }
2462
2463 // Parse JavaVMInitArgs structure
2464
2465 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2466 const JavaVMInitArgs *java_options_args,
2467 const JavaVMInitArgs *cmd_line_args) {
2468 bool patch_mod_javabase = false;
2469
2470 // Save default settings for some mode flags
2471 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2472 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2473 Arguments::_ClipInlining = ClipInlining;
2474 Arguments::_BackgroundCompilation = BackgroundCompilation;
2475 if (TieredCompilation) {
2476 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2477 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2478 }
2479
2480 // Setup flags for mixed which is the default
2481 set_mode_flags(_mixed);
2482
2483 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2484 // variable (if present).
2485 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2486 if (result != JNI_OK) {
2487 return result;
2488 }
2489
2490 // Parse args structure generated from the command line flags.
2491 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2492 if (result != JNI_OK) {
2493 return result;
2494 }
2495
2496 // Parse args structure generated from the _JAVA_OPTIONS environment
2497 // variable (if present) (mimics classic VM)
2498 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2499 if (result != JNI_OK) {
2500 return result;
2501 }
2502
2503 // We need to ensure processor and memory resources have been properly
2504 // configured - which may rely on arguments we just processed - before
2505 // doing the final argument processing. Any argument processing that
2506 // needs to know about processor and memory resources must occur after
2507 // this point.
2508
2509 os::init_container_support();
2510
2511 // Do final processing now that all arguments have been parsed
2512 result = finalize_vm_init_args(patch_mod_javabase);
2513 if (result != JNI_OK) {
2514 return result;
2515 }
2516
2517 return JNI_OK;
2518 }
2519
2520 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2521 // represents a valid JDWP agent. is_path==true denotes that we
2522 // are dealing with -agentpath (case where name is a path), otherwise with
2523 // -agentlib
2524 bool valid_jdwp_agent(char *name, bool is_path) {
2525 char *_name;
2526 const char *_jdwp = "jdwp";
2527 size_t _len_jdwp, _len_prefix;
2528
2529 if (is_path) {
2530 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2531 return false;
2532 }
2533
2534 _name++; // skip past last path separator
2535 _len_prefix = strlen(JNI_LIB_PREFIX);
2536
2537 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2538 return false;
2539 }
2540
2541 _name += _len_prefix;
2542 _len_jdwp = strlen(_jdwp);
2543
2544 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2545 _name += _len_jdwp;
2546 }
2547 else {
2548 return false;
2549 }
2550
2551 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2552 return false;
2553 }
2554
2555 return true;
2556 }
2557
2558 if (strcmp(name, _jdwp) == 0) {
2559 return true;
2560 }
2561
2562 return false;
2563 }
2564
2565 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2566 // --patch-module=<module>=<file>(<pathsep><file>)*
2567 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2568 // Find the equal sign between the module name and the path specification
2569 const char* module_equal = strchr(patch_mod_tail, '=');
2570 if (module_equal == NULL) {
2571 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2572 return JNI_ERR;
2573 } else {
2574 // Pick out the module name
2575 size_t module_len = module_equal - patch_mod_tail;
2576 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2577 if (module_name != NULL) {
2578 memcpy(module_name, patch_mod_tail, module_len);
2579 *(module_name + module_len) = '\0';
2580 // The path piece begins one past the module_equal sign
2581 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2582 FREE_C_HEAP_ARRAY(char, module_name);
2583 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2584 return JNI_ENOMEM;
2585 }
2586 } else {
2587 return JNI_ENOMEM;
2588 }
2589 }
2590 return JNI_OK;
2591 }
2592
2593 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2594 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2595 // The min and max sizes match the values in globals.hpp, but scaled
2596 // with K. The values have been chosen so that alignment with page
2597 // size doesn't change the max value, which makes the conversions
2598 // back and forth between Xss value and ThreadStackSize value easier.
2599 // The values have also been chosen to fit inside a 32-bit signed type.
2600 const julong min_ThreadStackSize = 0;
2601 const julong max_ThreadStackSize = 1 * M;
2602
2603 const julong min_size = min_ThreadStackSize * K;
2604 const julong max_size = max_ThreadStackSize * K;
2605
2606 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2607
2608 julong size = 0;
2609 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2610 if (errcode != arg_in_range) {
2611 bool silent = (option == NULL); // Allow testing to silence error messages
2612 if (!silent) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Invalid thread stack size: %s\n", option->optionString);
2615 describe_range_error(errcode);
2616 }
2617 return JNI_EINVAL;
2618 }
2619
2620 // Internally track ThreadStackSize in units of 1024 bytes.
2621 const julong size_aligned = align_up(size, K);
2622 assert(size <= size_aligned,
2623 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2624 size, size_aligned);
2625
2626 const julong size_in_K = size_aligned / K;
2627 assert(size_in_K < (julong)max_intx,
2628 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2629 size_in_K);
2630
2631 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2632 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2633 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2634 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2635 max_expanded, size_in_K);
2636
2637 *out_ThreadStackSize = (intx)size_in_K;
2638
2639 return JNI_OK;
2640 }
2641
2642 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2643 // For match_option to return remaining or value part of option string
2644 const char* tail;
2645
2646 // iterate over arguments
2647 for (int index = 0; index < args->nOptions; index++) {
2648 bool is_absolute_path = false; // for -agentpath vs -agentlib
2649
2650 const JavaVMOption* option = args->options + index;
2651
2652 if (!match_option(option, "-Djava.class.path", &tail) &&
2653 !match_option(option, "-Dsun.java.command", &tail) &&
2654 !match_option(option, "-Dsun.java.launcher", &tail)) {
2655
2656 // add all jvm options to the jvm_args string. This string
2657 // is used later to set the java.vm.args PerfData string constant.
2658 // the -Djava.class.path and the -Dsun.java.command options are
2659 // omitted from jvm_args string as each have their own PerfData
2660 // string constant object.
2661 build_jvm_args(option->optionString);
2662 }
2663
2664 // -verbose:[class/module/gc/jni]
2665 if (match_option(option, "-verbose", &tail)) {
2666 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2667 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2668 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2669 } else if (!strcmp(tail, ":module")) {
2670 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2671 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2672 } else if (!strcmp(tail, ":gc")) {
2673 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2674 } else if (!strcmp(tail, ":jni")) {
2675 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 }
2679 // -da / -ea / -disableassertions / -enableassertions
2680 // These accept an optional class/package name separated by a colon, e.g.,
2681 // -da:java.lang.Thread.
2682 } else if (match_option(option, user_assertion_options, &tail, true)) {
2683 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2684 if (*tail == '\0') {
2685 JavaAssertions::setUserClassDefault(enable);
2686 } else {
2687 assert(*tail == ':', "bogus match by match_option()");
2688 JavaAssertions::addOption(tail + 1, enable);
2689 }
2690 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2691 } else if (match_option(option, system_assertion_options, &tail, false)) {
2692 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2693 JavaAssertions::setSystemClassDefault(enable);
2694 // -bootclasspath:
2695 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2696 jio_fprintf(defaultStream::output_stream(),
2697 "-Xbootclasspath is no longer a supported option.\n");
2698 return JNI_EINVAL;
2699 // -bootclasspath/a:
2700 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2701 Arguments::append_sysclasspath(tail);
2702 // -bootclasspath/p:
2703 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2704 jio_fprintf(defaultStream::output_stream(),
2705 "-Xbootclasspath/p is no longer a supported option.\n");
2706 return JNI_EINVAL;
2707 // -Xrun
2708 } else if (match_option(option, "-Xrun", &tail)) {
2709 if (tail != NULL) {
2710 const char* pos = strchr(tail, ':');
2711 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2712 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2713 jio_snprintf(name, len + 1, "%s", tail);
2714
2715 char *options = NULL;
2716 if(pos != NULL) {
2717 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2718 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2719 }
2720 #if !INCLUDE_JVMTI
2721 if (strcmp(name, "jdwp") == 0) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "Debugging agents are not supported in this VM\n");
2724 return JNI_ERR;
2725 }
2726 #endif // !INCLUDE_JVMTI
2727 add_init_library(name, options);
2728 }
2729 } else if (match_option(option, "--add-reads=", &tail)) {
2730 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2731 return JNI_ENOMEM;
2732 }
2733 } else if (match_option(option, "--add-exports=", &tail)) {
2734 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2735 return JNI_ENOMEM;
2736 }
2737 } else if (match_option(option, "--add-opens=", &tail)) {
2738 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2739 return JNI_ENOMEM;
2740 }
2741 } else if (match_option(option, "--add-modules=", &tail)) {
2742 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2743 return JNI_ENOMEM;
2744 }
2745 } else if (match_option(option, "--limit-modules=", &tail)) {
2746 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2747 return JNI_ENOMEM;
2748 }
2749 } else if (match_option(option, "--module-path=", &tail)) {
2750 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2751 return JNI_ENOMEM;
2752 }
2753 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2754 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2755 return JNI_ENOMEM;
2756 }
2757 } else if (match_option(option, "--patch-module=", &tail)) {
2758 // --patch-module=<module>=<file>(<pathsep><file>)*
2759 int res = process_patch_mod_option(tail, patch_mod_javabase);
2760 if (res != JNI_OK) {
2761 return res;
2762 }
2763 } else if (match_option(option, "--illegal-access=", &tail)) {
2764 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2765 return JNI_ENOMEM;
2766 }
2767 // -agentlib and -agentpath
2768 } else if (match_option(option, "-agentlib:", &tail) ||
2769 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2770 if(tail != NULL) {
2771 const char* pos = strchr(tail, '=');
2772 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2773 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2774 name[len] = '\0';
2775
2776 char *options = NULL;
2777 if(pos != NULL) {
2778 options = os::strdup_check_oom(pos + 1, mtArguments);
2779 }
2780 #if !INCLUDE_JVMTI
2781 if (valid_jdwp_agent(name, is_absolute_path)) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Debugging agents are not supported in this VM\n");
2784 return JNI_ERR;
2785 }
2786 #endif // !INCLUDE_JVMTI
2787 add_init_agent(name, options, is_absolute_path);
2788 }
2789 // -javaagent
2790 } else if (match_option(option, "-javaagent:", &tail)) {
2791 #if !INCLUDE_JVMTI
2792 jio_fprintf(defaultStream::error_stream(),
2793 "Instrumentation agents are not supported in this VM\n");
2794 return JNI_ERR;
2795 #else
2796 if (tail != NULL) {
2797 size_t length = strlen(tail) + 1;
2798 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2799 jio_snprintf(options, length, "%s", tail);
2800 add_init_agent("instrument", options, false);
2801 // java agents need module java.instrument
2802 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2803 return JNI_ENOMEM;
2804 }
2805 }
2806 #endif // !INCLUDE_JVMTI
2807 // -Xnoclassgc
2808 } else if (match_option(option, "-Xnoclassgc")) {
2809 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 // -Xconcgc
2813 } else if (match_option(option, "-Xconcgc")) {
2814 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2818 // -Xnoconcgc
2819 } else if (match_option(option, "-Xnoconcgc")) {
2820 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2824 // -Xbatch
2825 } else if (match_option(option, "-Xbatch")) {
2826 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829 // -Xmn for compatibility with other JVM vendors
2830 } else if (match_option(option, "-Xmn", &tail)) {
2831 julong long_initial_young_size = 0;
2832 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2833 if (errcode != arg_in_range) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Invalid initial young generation size: %s\n", option->optionString);
2836 describe_range_error(errcode);
2837 return JNI_EINVAL;
2838 }
2839 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2840 return JNI_EINVAL;
2841 }
2842 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 // -Xms
2846 } else if (match_option(option, "-Xms", &tail)) {
2847 julong long_initial_heap_size = 0;
2848 // an initial heap size of 0 means automatically determine
2849 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid initial heap size: %s\n", option->optionString);
2853 describe_range_error(errcode);
2854 return JNI_EINVAL;
2855 }
2856 set_min_heap_size((size_t)long_initial_heap_size);
2857 // Currently the minimum size and the initial heap sizes are the same.
2858 // Can be overridden with -XX:InitialHeapSize.
2859 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 // -Xmx
2863 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2864 julong long_max_heap_size = 0;
2865 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2866 if (errcode != arg_in_range) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Invalid maximum heap size: %s\n", option->optionString);
2869 describe_range_error(errcode);
2870 return JNI_EINVAL;
2871 }
2872 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 // Xmaxf
2876 } else if (match_option(option, "-Xmaxf", &tail)) {
2877 char* err;
2878 int maxf = (int)(strtod(tail, &err) * 100);
2879 if (*err != '\0' || *tail == '\0') {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Bad max heap free percentage size: %s\n",
2882 option->optionString);
2883 return JNI_EINVAL;
2884 } else {
2885 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 }
2889 // Xminf
2890 } else if (match_option(option, "-Xminf", &tail)) {
2891 char* err;
2892 int minf = (int)(strtod(tail, &err) * 100);
2893 if (*err != '\0' || *tail == '\0') {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Bad min heap free percentage size: %s\n",
2896 option->optionString);
2897 return JNI_EINVAL;
2898 } else {
2899 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 }
2903 // -Xss
2904 } else if (match_option(option, "-Xss", &tail)) {
2905 intx value = 0;
2906 jint err = parse_xss(option, tail, &value);
2907 if (err != JNI_OK) {
2908 return err;
2909 }
2910 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2914 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2915 julong long_ReservedCodeCacheSize = 0;
2916
2917 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2918 if (errcode != arg_in_range) {
2919 jio_fprintf(defaultStream::error_stream(),
2920 "Invalid maximum code cache size: %s.\n", option->optionString);
2921 return JNI_EINVAL;
2922 }
2923 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 // -green
2927 } else if (match_option(option, "-green")) {
2928 jio_fprintf(defaultStream::error_stream(),
2929 "Green threads support not available\n");
2930 return JNI_EINVAL;
2931 // -native
2932 } else if (match_option(option, "-native")) {
2933 // HotSpot always uses native threads, ignore silently for compatibility
2934 // -Xrs
2935 } else if (match_option(option, "-Xrs")) {
2936 // Classic/EVM option, new functionality
2937 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 // -Xprof
2941 } else if (match_option(option, "-Xprof")) {
2942 char version[256];
2943 // Obsolete in JDK 10
2944 JDK_Version::jdk(10).to_string(version, sizeof(version));
2945 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2946 // -Xconcurrentio
2947 } else if (match_option(option, "-Xconcurrentio")) {
2948 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2958 return JNI_EINVAL;
2959 }
2960 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2961 return JNI_EINVAL;
2962 }
2963
2964 // -Xinternalversion
2965 } else if (match_option(option, "-Xinternalversion")) {
2966 jio_fprintf(defaultStream::output_stream(), "%s\n",
2967 VM_Version::internal_vm_info_string());
2968 vm_exit(0);
2969 #ifndef PRODUCT
2970 // -Xprintflags
2971 } else if (match_option(option, "-Xprintflags")) {
2972 CommandLineFlags::printFlags(tty, false);
2973 vm_exit(0);
2974 #endif
2975 // -D
2976 } else if (match_option(option, "-D", &tail)) {
2977 const char* value;
2978 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2979 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2980 // abort if -Djava.endorsed.dirs is set
2981 jio_fprintf(defaultStream::output_stream(),
2982 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2983 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2984 return JNI_EINVAL;
2985 }
2986 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2987 *value != '\0' && strcmp(value, "\"\"") != 0) {
2988 // abort if -Djava.ext.dirs is set
2989 jio_fprintf(defaultStream::output_stream(),
2990 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2991 return JNI_EINVAL;
2992 }
2993 // Check for module related properties. They must be set using the modules
2994 // options. For example: use "--add-modules=java.sql", not
2995 // "-Djdk.module.addmods=java.sql"
2996 if (is_internal_module_property(option->optionString + 2)) {
2997 needs_module_property_warning = true;
2998 continue;
2999 }
3000
3001 if (!add_property(tail)) {
3002 return JNI_ENOMEM;
3003 }
3004 // Out of the box management support
3005 if (match_option(option, "-Dcom.sun.management", &tail)) {
3006 #if INCLUDE_MANAGEMENT
3007 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 // management agent in module jdk.management.agent
3011 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3012 return JNI_ENOMEM;
3013 }
3014 #else
3015 jio_fprintf(defaultStream::output_stream(),
3016 "-Dcom.sun.management is not supported in this VM.\n");
3017 return JNI_ERR;
3018 #endif
3019 }
3020 // -Xint
3021 } else if (match_option(option, "-Xint")) {
3022 set_mode_flags(_int);
3023 // -Xmixed
3024 } else if (match_option(option, "-Xmixed")) {
3025 set_mode_flags(_mixed);
3026 // -Xcomp
3027 } else if (match_option(option, "-Xcomp")) {
3028 // for testing the compiler; turn off all flags that inhibit compilation
3029 set_mode_flags(_comp);
3030 // -Xshare:dump
3031 } else if (match_option(option, "-Xshare:dump")) {
3032 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3033 return JNI_EINVAL;
3034 }
3035 set_mode_flags(_int); // Prevent compilation, which creates objects
3036 // -Xshare:on
3037 } else if (match_option(option, "-Xshare:on")) {
3038 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3042 return JNI_EINVAL;
3043 }
3044 // -Xshare:auto
3045 } else if (match_option(option, "-Xshare:auto")) {
3046 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3050 return JNI_EINVAL;
3051 }
3052 // -Xshare:off
3053 } else if (match_option(option, "-Xshare:off")) {
3054 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 // -Xverify
3061 } else if (match_option(option, "-Xverify", &tail)) {
3062 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3063 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3064 return JNI_EINVAL;
3065 }
3066 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3067 return JNI_EINVAL;
3068 }
3069 } else if (strcmp(tail, ":remote") == 0) {
3070 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3074 return JNI_EINVAL;
3075 }
3076 } else if (strcmp(tail, ":none") == 0) {
3077 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3084 return JNI_EINVAL;
3085 }
3086 // -Xdebug
3087 } else if (match_option(option, "-Xdebug")) {
3088 // note this flag has been used, then ignore
3089 set_xdebug_mode(true);
3090 // -Xnoagent
3091 } else if (match_option(option, "-Xnoagent")) {
3092 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3093 } else if (match_option(option, "-Xloggc:", &tail)) {
3094 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3095 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3096 _gc_log_filename = os::strdup_check_oom(tail);
3097 } else if (match_option(option, "-Xlog", &tail)) {
3098 bool ret = false;
3099 if (strcmp(tail, ":help") == 0) {
3100 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3101 vm_exit(0);
3102 } else if (strcmp(tail, ":disable") == 0) {
3103 LogConfiguration::disable_logging();
3104 ret = true;
3105 } else if (*tail == '\0') {
3106 ret = LogConfiguration::parse_command_line_arguments();
3107 assert(ret, "-Xlog without arguments should never fail to parse");
3108 } else if (*tail == ':') {
3109 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3110 }
3111 if (ret == false) {
3112 jio_fprintf(defaultStream::error_stream(),
3113 "Invalid -Xlog option '-Xlog%s'\n",
3114 tail);
3115 return JNI_EINVAL;
3116 }
3117 // JNI hooks
3118 } else if (match_option(option, "-Xcheck", &tail)) {
3119 if (!strcmp(tail, ":jni")) {
3120 #if !INCLUDE_JNI_CHECK
3121 warning("JNI CHECKING is not supported in this VM");
3122 #else
3123 CheckJNICalls = true;
3124 #endif // INCLUDE_JNI_CHECK
3125 } else if (is_bad_option(option, args->ignoreUnrecognized,
3126 "check")) {
3127 return JNI_EINVAL;
3128 }
3129 } else if (match_option(option, "vfprintf")) {
3130 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3131 } else if (match_option(option, "exit")) {
3132 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3133 } else if (match_option(option, "abort")) {
3134 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3135 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3136 // and the last option wins.
3137 } else if (match_option(option, "-XX:+NeverTenure")) {
3138 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3139 return JNI_EINVAL;
3140 }
3141 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3145 return JNI_EINVAL;
3146 }
3147 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3148 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3152 return JNI_EINVAL;
3153 }
3154 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3158 uintx max_tenuring_thresh = 0;
3159 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3160 jio_fprintf(defaultStream::error_stream(),
3161 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3162 return JNI_EINVAL;
3163 }
3164
3165 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3166 return JNI_EINVAL;
3167 }
3168
3169 if (MaxTenuringThreshold == 0) {
3170 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3171 return JNI_EINVAL;
3172 }
3173 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176 } else {
3177 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 }
3184 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3185 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3192 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3199 #if defined(DTRACE_ENABLED)
3200 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3207 return JNI_EINVAL;
3208 }
3209 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3210 return JNI_EINVAL;
3211 }
3212 #else // defined(DTRACE_ENABLED)
3213 jio_fprintf(defaultStream::error_stream(),
3214 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3215 return JNI_EINVAL;
3216 #endif // defined(DTRACE_ENABLED)
3217 #ifdef ASSERT
3218 } else if (match_option(option, "-XX:+FullGCALot")) {
3219 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3220 return JNI_EINVAL;
3221 }
3222 // disable scavenge before parallel mark-compact
3223 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 #endif
3227 #if !INCLUDE_MANAGEMENT
3228 } else if (match_option(option, "-XX:+ManagementServer")) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "ManagementServer is not supported in this VM.\n");
3231 return JNI_ERR;
3232 #endif // INCLUDE_MANAGEMENT
3233 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3234 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3235 // already been handled
3236 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3237 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3238 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3239 return JNI_EINVAL;
3240 }
3241 }
3242 // Unknown option
3243 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3244 return JNI_ERR;
3245 }
3246 }
3247
3248 // PrintSharedArchiveAndExit will turn on
3249 // -Xshare:on
3250 // -Xlog:class+path=info
3251 if (PrintSharedArchiveAndExit) {
3252 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3253 return JNI_EINVAL;
3254 }
3255 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3256 return JNI_EINVAL;
3257 }
3258 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3259 }
3260
3261 // Change the default value for flags which have different default values
3262 // when working with older JDKs.
3263 #ifdef LINUX
3264 if (JDK_Version::current().compare_major(6) <= 0 &&
3265 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3266 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3267 }
3268 #endif // LINUX
3269 fix_appclasspath();
3270 return JNI_OK;
3271 }
3272
3273 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3274 // For java.base check for duplicate --patch-module options being specified on the command line.
3275 // This check is only required for java.base, all other duplicate module specifications
3276 // will be checked during module system initialization. The module system initialization
3277 // will throw an ExceptionInInitializerError if this situation occurs.
3278 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3279 if (*patch_mod_javabase) {
3280 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3281 } else {
3282 *patch_mod_javabase = true;
3283 }
3284 }
3285
3286 // Create GrowableArray lazily, only if --patch-module has been specified
3287 if (_patch_mod_prefix == NULL) {
3288 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3289 }
3290
3291 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3292 }
3293
3294 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3295 //
3296 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3297 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3298 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3299 // path is treated as the current directory.
3300 //
3301 // This causes problems with CDS, which requires that all directories specified in the classpath
3302 // must be empty. In most cases, applications do NOT want to load classes from the current
3303 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3304 // scripts compatible with CDS.
3305 void Arguments::fix_appclasspath() {
3306 if (IgnoreEmptyClassPaths) {
3307 const char separator = *os::path_separator();
3308 const char* src = _java_class_path->value();
3309
3310 // skip over all the leading empty paths
3311 while (*src == separator) {
3312 src ++;
3313 }
3314
3315 char* copy = os::strdup_check_oom(src, mtArguments);
3316
3317 // trim all trailing empty paths
3318 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3319 *tail = '\0';
3320 }
3321
3322 char from[3] = {separator, separator, '\0'};
3323 char to [2] = {separator, '\0'};
3324 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3325 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3326 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3327 }
3328
3329 _java_class_path->set_writeable_value(copy);
3330 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3331 }
3332 }
3333
3334 static bool has_jar_files(const char* directory) {
3335 DIR* dir = os::opendir(directory);
3336 if (dir == NULL) return false;
3337
3338 struct dirent *entry;
3339 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3340 bool hasJarFile = false;
3341 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3342 const char* name = entry->d_name;
3343 const char* ext = name + strlen(name) - 4;
3344 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3345 }
3346 FREE_C_HEAP_ARRAY(char, dbuf);
3347 os::closedir(dir);
3348 return hasJarFile ;
3349 }
3350
3351 static int check_non_empty_dirs(const char* path) {
3352 const char separator = *os::path_separator();
3353 const char* const end = path + strlen(path);
3354 int nonEmptyDirs = 0;
3355 while (path < end) {
3356 const char* tmp_end = strchr(path, separator);
3357 if (tmp_end == NULL) {
3358 if (has_jar_files(path)) {
3359 nonEmptyDirs++;
3360 jio_fprintf(defaultStream::output_stream(),
3361 "Non-empty directory: %s\n", path);
3362 }
3363 path = end;
3364 } else {
3365 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3366 memcpy(dirpath, path, tmp_end - path);
3367 dirpath[tmp_end - path] = '\0';
3368 if (has_jar_files(dirpath)) {
3369 nonEmptyDirs++;
3370 jio_fprintf(defaultStream::output_stream(),
3371 "Non-empty directory: %s\n", dirpath);
3372 }
3373 FREE_C_HEAP_ARRAY(char, dirpath);
3374 path = tmp_end + 1;
3375 }
3376 }
3377 return nonEmptyDirs;
3378 }
3379
3380 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3381 // check if the default lib/endorsed directory exists; if so, error
3382 char path[JVM_MAXPATHLEN];
3383 const char* fileSep = os::file_separator();
3384 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3385
3386 if (CheckEndorsedAndExtDirs) {
3387 int nonEmptyDirs = 0;
3388 // check endorsed directory
3389 nonEmptyDirs += check_non_empty_dirs(path);
3390 // check the extension directories
3391 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3392 if (nonEmptyDirs > 0) {
3393 return JNI_ERR;
3394 }
3395 }
3396
3397 DIR* dir = os::opendir(path);
3398 if (dir != NULL) {
3399 jio_fprintf(defaultStream::output_stream(),
3400 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3401 "in modular form will be supported via the concept of upgradeable modules.\n");
3402 os::closedir(dir);
3403 return JNI_ERR;
3404 }
3405
3406 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3407 dir = os::opendir(path);
3408 if (dir != NULL) {
3409 jio_fprintf(defaultStream::output_stream(),
3410 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3411 "Use -classpath instead.\n.");
3412 os::closedir(dir);
3413 return JNI_ERR;
3414 }
3415
3416 // This must be done after all arguments have been processed
3417 // and the container support has been initialized since AggressiveHeap
3418 // relies on the amount of total memory available.
3419 if (AggressiveHeap) {
3420 jint result = set_aggressive_heap_flags();
3421 if (result != JNI_OK) {
3422 return result;
3423 }
3424 }
3425
3426 // This must be done after all arguments have been processed.
3427 // java_compiler() true means set to "NONE" or empty.
3428 if (java_compiler() && !xdebug_mode()) {
3429 // For backwards compatibility, we switch to interpreted mode if
3430 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3431 // not specified.
3432 set_mode_flags(_int);
3433 }
3434
3435 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3436 // but like -Xint, leave compilation thresholds unaffected.
3437 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3438 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3439 set_mode_flags(_int);
3440 }
3441
3442 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3443 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3444 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3445 }
3446
3447 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3448 // Don't degrade server performance for footprint
3449 if (FLAG_IS_DEFAULT(UseLargePages) &&
3450 MaxHeapSize < LargePageHeapSizeThreshold) {
3451 // No need for large granularity pages w/small heaps.
3452 // Note that large pages are enabled/disabled for both the
3453 // Java heap and the code cache.
3454 FLAG_SET_DEFAULT(UseLargePages, false);
3455 }
3456
3457 #elif defined(COMPILER2)
3458 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3459 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3460 }
3461 #endif
3462
3463 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3464 UNSUPPORTED_OPTION(ProfileInterpreter);
3465 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3466 #endif
3467
3468 #ifndef TIERED
3469 // Tiered compilation is undefined.
3470 UNSUPPORTED_OPTION(TieredCompilation);
3471 #endif
3472
3473 #if INCLUDE_JVMCI
3474 if (EnableJVMCI &&
3475 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3476 return JNI_ENOMEM;
3477 }
3478 #endif
3479
3480 // If we are running in a headless jre, force java.awt.headless property
3481 // to be true unless the property has already been set.
3482 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3483 if (os::is_headless_jre()) {
3484 const char* headless = Arguments::get_property("java.awt.headless");
3485 if (headless == NULL) {
3486 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3487 if (headless_env == NULL) {
3488 if (!add_property("java.awt.headless=true")) {
3489 return JNI_ENOMEM;
3490 }
3491 } else {
3492 char buffer[256];
3493 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3494 if (!add_property(buffer)) {
3495 return JNI_ENOMEM;
3496 }
3497 }
3498 }
3499 }
3500
3501 if (!check_vm_args_consistency()) {
3502 return JNI_ERR;
3503 }
3504
3505 #if INCLUDE_JVMCI
3506 if (UseJVMCICompiler) {
3507 Compilation_mode = CompMode_server;
3508 }
3509 #endif
3510
3511 #if INCLUDE_CDS
3512 if (DumpSharedSpaces) {
3513 // Disable biased locking now as it interferes with the clean up of
3514 // the archived Klasses and Java string objects (at dump time only).
3515 UseBiasedLocking = false;
3516 }
3517 if (UseSharedSpaces && patch_mod_javabase) {
3518 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3519 }
3520 #endif
3521
3522 return JNI_OK;
3523 }
3524
3525 // Helper class for controlling the lifetime of JavaVMInitArgs
3526 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3527 // deleted on the destruction of the ScopedVMInitArgs object.
3528 class ScopedVMInitArgs : public StackObj {
3529 private:
3530 JavaVMInitArgs _args;
3531 char* _container_name;
3532 bool _is_set;
3533 char* _vm_options_file_arg;
3534
3535 public:
3536 ScopedVMInitArgs(const char *container_name) {
3537 _args.version = JNI_VERSION_1_2;
3538 _args.nOptions = 0;
3539 _args.options = NULL;
3540 _args.ignoreUnrecognized = false;
3541 _container_name = (char *)container_name;
3542 _is_set = false;
3543 _vm_options_file_arg = NULL;
3544 }
3545
3546 // Populates the JavaVMInitArgs object represented by this
3547 // ScopedVMInitArgs object with the arguments in options. The
3548 // allocated memory is deleted by the destructor. If this method
3549 // returns anything other than JNI_OK, then this object is in a
3550 // partially constructed state, and should be abandoned.
3551 jint set_args(GrowableArray<JavaVMOption>* options) {
3552 _is_set = true;
3553 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3554 JavaVMOption, options->length(), mtArguments);
3555 if (options_arr == NULL) {
3556 return JNI_ENOMEM;
3557 }
3558 _args.options = options_arr;
3559
3560 for (int i = 0; i < options->length(); i++) {
3561 options_arr[i] = options->at(i);
3562 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3563 if (options_arr[i].optionString == NULL) {
3564 // Rely on the destructor to do cleanup.
3565 _args.nOptions = i;
3566 return JNI_ENOMEM;
3567 }
3568 }
3569
3570 _args.nOptions = options->length();
3571 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3572 return JNI_OK;
3573 }
3574
3575 JavaVMInitArgs* get() { return &_args; }
3576 char* container_name() { return _container_name; }
3577 bool is_set() { return _is_set; }
3578 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3579 char* vm_options_file_arg() { return _vm_options_file_arg; }
3580
3581 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3582 if (_vm_options_file_arg != NULL) {
3583 os::free(_vm_options_file_arg);
3584 }
3585 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3586 }
3587
3588 ~ScopedVMInitArgs() {
3589 if (_vm_options_file_arg != NULL) {
3590 os::free(_vm_options_file_arg);
3591 }
3592 if (_args.options == NULL) return;
3593 for (int i = 0; i < _args.nOptions; i++) {
3594 os::free(_args.options[i].optionString);
3595 }
3596 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3597 }
3598
3599 // Insert options into this option list, to replace option at
3600 // vm_options_file_pos (-XX:VMOptionsFile)
3601 jint insert(const JavaVMInitArgs* args,
3602 const JavaVMInitArgs* args_to_insert,
3603 const int vm_options_file_pos) {
3604 assert(_args.options == NULL, "shouldn't be set yet");
3605 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3606 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3607
3608 int length = args->nOptions + args_to_insert->nOptions - 1;
3609 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3610 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3611 for (int i = 0; i < args->nOptions; i++) {
3612 if (i == vm_options_file_pos) {
3613 // insert the new options starting at the same place as the
3614 // -XX:VMOptionsFile option
3615 for (int j = 0; j < args_to_insert->nOptions; j++) {
3616 options->push(args_to_insert->options[j]);
3617 }
3618 } else {
3619 options->push(args->options[i]);
3620 }
3621 }
3622 // make into options array
3623 jint result = set_args(options);
3624 delete options;
3625 return result;
3626 }
3627 };
3628
3629 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3630 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3631 }
3632
3633 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3634 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3635 }
3636
3637 jint Arguments::parse_options_environment_variable(const char* name,
3638 ScopedVMInitArgs* vm_args) {
3639 char *buffer = ::getenv(name);
3640
3641 // Don't check this environment variable if user has special privileges
3642 // (e.g. unix su command).
3643 if (buffer == NULL || os::have_special_privileges()) {
3644 return JNI_OK;
3645 }
3646
3647 if ((buffer = os::strdup(buffer)) == NULL) {
3648 return JNI_ENOMEM;
3649 }
3650
3651 jio_fprintf(defaultStream::error_stream(),
3652 "Picked up %s: %s\n", name, buffer);
3653
3654 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3655
3656 os::free(buffer);
3657 return retcode;
3658 }
3659
3660 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3661 // read file into buffer
3662 int fd = ::open(file_name, O_RDONLY);
3663 if (fd < 0) {
3664 jio_fprintf(defaultStream::error_stream(),
3665 "Could not open options file '%s'\n",
3666 file_name);
3667 return JNI_ERR;
3668 }
3669
3670 struct stat stbuf;
3671 int retcode = os::stat(file_name, &stbuf);
3672 if (retcode != 0) {
3673 jio_fprintf(defaultStream::error_stream(),
3674 "Could not stat options file '%s'\n",
3675 file_name);
3676 os::close(fd);
3677 return JNI_ERR;
3678 }
3679
3680 if (stbuf.st_size == 0) {
3681 // tell caller there is no option data and that is ok
3682 os::close(fd);
3683 return JNI_OK;
3684 }
3685
3686 // '+ 1' for NULL termination even with max bytes
3687 size_t bytes_alloc = stbuf.st_size + 1;
3688
3689 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3690 if (NULL == buf) {
3691 jio_fprintf(defaultStream::error_stream(),
3692 "Could not allocate read buffer for options file parse\n");
3693 os::close(fd);
3694 return JNI_ENOMEM;
3695 }
3696
3697 memset(buf, 0, bytes_alloc);
3698
3699 // Fill buffer
3700 // Use ::read() instead of os::read because os::read()
3701 // might do a thread state transition
3702 // and it is too early for that here
3703
3704 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3705 os::close(fd);
3706 if (bytes_read < 0) {
3707 FREE_C_HEAP_ARRAY(char, buf);
3708 jio_fprintf(defaultStream::error_stream(),
3709 "Could not read options file '%s'\n", file_name);
3710 return JNI_ERR;
3711 }
3712
3713 if (bytes_read == 0) {
3714 // tell caller there is no option data and that is ok
3715 FREE_C_HEAP_ARRAY(char, buf);
3716 return JNI_OK;
3717 }
3718
3719 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3720
3721 FREE_C_HEAP_ARRAY(char, buf);
3722 return retcode;
3723 }
3724
3725 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3726 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3727
3728 // some pointers to help with parsing
3729 char *buffer_end = buffer + buf_len;
3730 char *opt_hd = buffer;
3731 char *wrt = buffer;
3732 char *rd = buffer;
3733
3734 // parse all options
3735 while (rd < buffer_end) {
3736 // skip leading white space from the input string
3737 while (rd < buffer_end && isspace(*rd)) {
3738 rd++;
3739 }
3740
3741 if (rd >= buffer_end) {
3742 break;
3743 }
3744
3745 // Remember this is where we found the head of the token.
3746 opt_hd = wrt;
3747
3748 // Tokens are strings of non white space characters separated
3749 // by one or more white spaces.
3750 while (rd < buffer_end && !isspace(*rd)) {
3751 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3752 int quote = *rd; // matching quote to look for
3753 rd++; // don't copy open quote
3754 while (rd < buffer_end && *rd != quote) {
3755 // include everything (even spaces)
3756 // up until the close quote
3757 *wrt++ = *rd++; // copy to option string
3758 }
3759
3760 if (rd < buffer_end) {
3761 rd++; // don't copy close quote
3762 } else {
3763 // did not see closing quote
3764 jio_fprintf(defaultStream::error_stream(),
3765 "Unmatched quote in %s\n", name);
3766 delete options;
3767 return JNI_ERR;
3768 }
3769 } else {
3770 *wrt++ = *rd++; // copy to option string
3771 }
3772 }
3773
3774 // steal a white space character and set it to NULL
3775 *wrt++ = '\0';
3776 // We now have a complete token
3777
3778 JavaVMOption option;
3779 option.optionString = opt_hd;
3780 option.extraInfo = NULL;
3781
3782 options->append(option); // Fill in option
3783
3784 rd++; // Advance to next character
3785 }
3786
3787 // Fill out JavaVMInitArgs structure.
3788 jint status = vm_args->set_args(options);
3789
3790 delete options;
3791 return status;
3792 }
3793
3794 void Arguments::set_shared_spaces_flags() {
3795 if (DumpSharedSpaces) {
3796 if (FailOverToOldVerifier) {
3797 // Don't fall back to the old verifier on verification failure. If a
3798 // class fails verification with the split verifier, it might fail the
3799 // CDS runtime verifier constraint check. In that case, we don't want
3800 // to share the class. We only archive classes that pass the split verifier.
3801 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3802 }
3803
3804 if (RequireSharedSpaces) {
3805 warning("Cannot dump shared archive while using shared archive");
3806 }
3807 UseSharedSpaces = false;
3808 #ifdef _LP64
3809 if (!UseCompressedOops || !UseCompressedClassPointers) {
3810 vm_exit_during_initialization(
3811 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3812 }
3813 } else {
3814 if (!UseCompressedOops || !UseCompressedClassPointers) {
3815 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3816 }
3817 #endif
3818 }
3819 }
3820
3821 // Sharing support
3822 // Construct the path to the archive
3823 static char* get_shared_archive_path() {
3824 char *shared_archive_path;
3825 if (SharedArchiveFile == NULL) {
3826 char jvm_path[JVM_MAXPATHLEN];
3827 os::jvm_path(jvm_path, sizeof(jvm_path));
3828 char *end = strrchr(jvm_path, *os::file_separator());
3829 if (end != NULL) *end = '\0';
3830 size_t jvm_path_len = strlen(jvm_path);
3831 size_t file_sep_len = strlen(os::file_separator());
3832 const size_t len = jvm_path_len + file_sep_len + 20;
3833 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3834 if (shared_archive_path != NULL) {
3835 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3836 jvm_path, os::file_separator());
3837 }
3838 } else {
3839 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3840 }
3841 return shared_archive_path;
3842 }
3843
3844 #ifndef PRODUCT
3845 // Determine whether LogVMOutput should be implicitly turned on.
3846 static bool use_vm_log() {
3847 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3848 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3849 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3850 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3851 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3852 return true;
3853 }
3854
3855 #ifdef COMPILER1
3856 if (PrintC1Statistics) {
3857 return true;
3858 }
3859 #endif // COMPILER1
3860
3861 #ifdef COMPILER2
3862 if (PrintOptoAssembly || PrintOptoStatistics) {
3863 return true;
3864 }
3865 #endif // COMPILER2
3866
3867 return false;
3868 }
3869
3870 #endif // PRODUCT
3871
3872 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3873 for (int index = 0; index < args->nOptions; index++) {
3874 const JavaVMOption* option = args->options + index;
3875 const char* tail;
3876 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3877 return true;
3878 }
3879 }
3880 return false;
3881 }
3882
3883 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3884 const char* vm_options_file,
3885 const int vm_options_file_pos,
3886 ScopedVMInitArgs* vm_options_file_args,
3887 ScopedVMInitArgs* args_out) {
3888 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3889 if (code != JNI_OK) {
3890 return code;
3891 }
3892
3893 if (vm_options_file_args->get()->nOptions < 1) {
3894 return JNI_OK;
3895 }
3896
3897 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3898 jio_fprintf(defaultStream::error_stream(),
3899 "A VM options file may not refer to a VM options file. "
3900 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3901 "options file '%s' in options container '%s' is an error.\n",
3902 vm_options_file_args->vm_options_file_arg(),
3903 vm_options_file_args->container_name());
3904 return JNI_EINVAL;
3905 }
3906
3907 return args_out->insert(args, vm_options_file_args->get(),
3908 vm_options_file_pos);
3909 }
3910
3911 // Expand -XX:VMOptionsFile found in args_in as needed.
3912 // mod_args and args_out parameters may return values as needed.
3913 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3914 ScopedVMInitArgs* mod_args,
3915 JavaVMInitArgs** args_out) {
3916 jint code = match_special_option_and_act(args_in, mod_args);
3917 if (code != JNI_OK) {
3918 return code;
3919 }
3920
3921 if (mod_args->is_set()) {
3922 // args_in contains -XX:VMOptionsFile and mod_args contains the
3923 // original options from args_in along with the options expanded
3924 // from the VMOptionsFile. Return a short-hand to the caller.
3925 *args_out = mod_args->get();
3926 } else {
3927 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3928 }
3929 return JNI_OK;
3930 }
3931
3932 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3933 ScopedVMInitArgs* args_out) {
3934 // Remaining part of option string
3935 const char* tail;
3936 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3937
3938 for (int index = 0; index < args->nOptions; index++) {
3939 const JavaVMOption* option = args->options + index;
3940 if (ArgumentsExt::process_options(option)) {
3941 continue;
3942 }
3943 if (match_option(option, "-XX:Flags=", &tail)) {
3944 Arguments::set_jvm_flags_file(tail);
3945 continue;
3946 }
3947 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3948 if (vm_options_file_args.found_vm_options_file_arg()) {
3949 jio_fprintf(defaultStream::error_stream(),
3950 "The option '%s' is already specified in the options "
3951 "container '%s' so the specification of '%s' in the "
3952 "same options container is an error.\n",
3953 vm_options_file_args.vm_options_file_arg(),
3954 vm_options_file_args.container_name(),
3955 option->optionString);
3956 return JNI_EINVAL;
3957 }
3958 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3959 // If there's a VMOptionsFile, parse that
3960 jint code = insert_vm_options_file(args, tail, index,
3961 &vm_options_file_args, args_out);
3962 if (code != JNI_OK) {
3963 return code;
3964 }
3965 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3966 if (args_out->is_set()) {
3967 // The VMOptions file inserted some options so switch 'args'
3968 // to the new set of options, and continue processing which
3969 // preserves "last option wins" semantics.
3970 args = args_out->get();
3971 // The first option from the VMOptionsFile replaces the
3972 // current option. So we back track to process the
3973 // replacement option.
3974 index--;
3975 }
3976 continue;
3977 }
3978 if (match_option(option, "-XX:+PrintVMOptions")) {
3979 PrintVMOptions = true;
3980 continue;
3981 }
3982 if (match_option(option, "-XX:-PrintVMOptions")) {
3983 PrintVMOptions = false;
3984 continue;
3985 }
3986 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3987 IgnoreUnrecognizedVMOptions = true;
3988 continue;
3989 }
3990 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3991 IgnoreUnrecognizedVMOptions = false;
3992 continue;
3993 }
3994 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3995 CommandLineFlags::printFlags(tty, false);
3996 vm_exit(0);
3997 }
3998 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3999 #if INCLUDE_NMT
4000 // The launcher did not setup nmt environment variable properly.
4001 if (!MemTracker::check_launcher_nmt_support(tail)) {
4002 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4003 }
4004
4005 // Verify if nmt option is valid.
4006 if (MemTracker::verify_nmt_option()) {
4007 // Late initialization, still in single-threaded mode.
4008 if (MemTracker::tracking_level() >= NMT_summary) {
4009 MemTracker::init();
4010 }
4011 } else {
4012 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4013 }
4014 continue;
4015 #else
4016 jio_fprintf(defaultStream::error_stream(),
4017 "Native Memory Tracking is not supported in this VM\n");
4018 return JNI_ERR;
4019 #endif
4020 }
4021
4022 #ifndef PRODUCT
4023 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4024 CommandLineFlags::printFlags(tty, true);
4025 vm_exit(0);
4026 }
4027 #endif
4028
4029 if (match_option(option, "-XX:+UseAppCDS")) {
4030 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4031 if (flag->is_diagnostic()) {
4032 flag->clear_diagnostic();
4033 }
4034 continue;
4035 }
4036 }
4037 return JNI_OK;
4038 }
4039
4040 static void print_options(const JavaVMInitArgs *args) {
4041 const char* tail;
4042 for (int index = 0; index < args->nOptions; index++) {
4043 const JavaVMOption *option = args->options + index;
4044 if (match_option(option, "-XX:", &tail)) {
4045 logOption(tail);
4046 }
4047 }
4048 }
4049
4050 bool Arguments::handle_deprecated_print_gc_flags() {
4051 if (PrintGC) {
4052 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4053 }
4054 if (PrintGCDetails) {
4055 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4056 }
4057
4058 if (_gc_log_filename != NULL) {
4059 // -Xloggc was used to specify a filename
4060 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4061
4062 LogTarget(Error, logging) target;
4063 LogStream errstream(target);
4064 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4065 } else if (PrintGC || PrintGCDetails) {
4066 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4067 }
4068 return true;
4069 }
4070
4071 void Arguments::handle_extra_cms_flags(const char* msg) {
4072 SpecialFlag flag;
4073 const char *flag_name = "UseConcMarkSweepGC";
4074 if (lookup_special_flag(flag_name, flag)) {
4075 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4076 warning("%s", msg);
4077 }
4078 }
4079
4080 // Parse entry point called from JNI_CreateJavaVM
4081
4082 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4083 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4084
4085 // Initialize ranges, constraints and writeables
4086 CommandLineFlagRangeList::init();
4087 CommandLineFlagConstraintList::init();
4088 CommandLineFlagWriteableList::init();
4089
4090 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4091 const char* hotspotrc = ".hotspotrc";
4092 bool settings_file_specified = false;
4093 bool needs_hotspotrc_warning = false;
4094 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4095 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4096
4097 // Pointers to current working set of containers
4098 JavaVMInitArgs* cur_cmd_args;
4099 JavaVMInitArgs* cur_java_options_args;
4100 JavaVMInitArgs* cur_java_tool_options_args;
4101
4102 // Containers for modified/expanded options
4103 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4104 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4105 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4106
4107
4108 jint code =
4109 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4110 if (code != JNI_OK) {
4111 return code;
4112 }
4113
4114 code = parse_java_options_environment_variable(&initial_java_options_args);
4115 if (code != JNI_OK) {
4116 return code;
4117 }
4118
4119 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4120 &mod_java_tool_options_args,
4121 &cur_java_tool_options_args);
4122 if (code != JNI_OK) {
4123 return code;
4124 }
4125
4126 code = expand_vm_options_as_needed(initial_cmd_args,
4127 &mod_cmd_args,
4128 &cur_cmd_args);
4129 if (code != JNI_OK) {
4130 return code;
4131 }
4132
4133 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4134 &mod_java_options_args,
4135 &cur_java_options_args);
4136 if (code != JNI_OK) {
4137 return code;
4138 }
4139
4140 const char* flags_file = Arguments::get_jvm_flags_file();
4141 settings_file_specified = (flags_file != NULL);
4142
4143 if (IgnoreUnrecognizedVMOptions) {
4144 cur_cmd_args->ignoreUnrecognized = true;
4145 cur_java_tool_options_args->ignoreUnrecognized = true;
4146 cur_java_options_args->ignoreUnrecognized = true;
4147 }
4148
4149 // Parse specified settings file
4150 if (settings_file_specified) {
4151 if (!process_settings_file(flags_file, true,
4152 cur_cmd_args->ignoreUnrecognized)) {
4153 return JNI_EINVAL;
4154 }
4155 } else {
4156 #ifdef ASSERT
4157 // Parse default .hotspotrc settings file
4158 if (!process_settings_file(".hotspotrc", false,
4159 cur_cmd_args->ignoreUnrecognized)) {
4160 return JNI_EINVAL;
4161 }
4162 #else
4163 struct stat buf;
4164 if (os::stat(hotspotrc, &buf) == 0) {
4165 needs_hotspotrc_warning = true;
4166 }
4167 #endif
4168 }
4169
4170 if (PrintVMOptions) {
4171 print_options(cur_java_tool_options_args);
4172 print_options(cur_cmd_args);
4173 print_options(cur_java_options_args);
4174 }
4175
4176 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4177 jint result = parse_vm_init_args(cur_java_tool_options_args,
4178 cur_java_options_args,
4179 cur_cmd_args);
4180
4181 if (result != JNI_OK) {
4182 return result;
4183 }
4184
4185 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4186 SharedArchivePath = get_shared_archive_path();
4187 if (SharedArchivePath == NULL) {
4188 return JNI_ENOMEM;
4189 }
4190
4191 // Set up VerifySharedSpaces
4192 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4193 VerifySharedSpaces = true;
4194 }
4195
4196 // Delay warning until here so that we've had a chance to process
4197 // the -XX:-PrintWarnings flag
4198 if (needs_hotspotrc_warning) {
4199 warning("%s file is present but has been ignored. "
4200 "Run with -XX:Flags=%s to load the file.",
4201 hotspotrc, hotspotrc);
4202 }
4203
4204 if (needs_module_property_warning) {
4205 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4206 " names that are reserved for internal use.");
4207 }
4208
4209 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4210 UNSUPPORTED_OPTION(UseLargePages);
4211 #endif
4212
4213 ArgumentsExt::report_unsupported_options();
4214
4215 #ifndef PRODUCT
4216 if (TraceBytecodesAt != 0) {
4217 TraceBytecodes = true;
4218 }
4219 if (CountCompiledCalls) {
4220 if (UseCounterDecay) {
4221 warning("UseCounterDecay disabled because CountCalls is set");
4222 UseCounterDecay = false;
4223 }
4224 }
4225 #endif // PRODUCT
4226
4227 if (ScavengeRootsInCode == 0) {
4228 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4229 warning("Forcing ScavengeRootsInCode non-zero");
4230 }
4231 ScavengeRootsInCode = 1;
4232 }
4233
4234 if (!handle_deprecated_print_gc_flags()) {
4235 return JNI_EINVAL;
4236 }
4237
4238 // Set object alignment values.
4239 set_object_alignment();
4240
4241 #if !INCLUDE_CDS
4242 if (DumpSharedSpaces || RequireSharedSpaces) {
4243 jio_fprintf(defaultStream::error_stream(),
4244 "Shared spaces are not supported in this VM\n");
4245 return JNI_ERR;
4246 }
4247 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4248 log_is_enabled(Info, cds)) {
4249 warning("Shared spaces are not supported in this VM");
4250 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4251 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4252 }
4253 no_shared_spaces("CDS Disabled");
4254 #endif // INCLUDE_CDS
4255
4256 return JNI_OK;
4257 }
4258
4259 jint Arguments::apply_ergo() {
4260 // Set flags based on ergonomics.
4261 jint result = set_ergonomics_flags();
4262 if (result != JNI_OK) return result;
4263
4264 #if INCLUDE_JVMCI
4265 set_jvmci_specific_flags();
4266 #endif
4267
4268 set_shared_spaces_flags();
4269
4270 // Check the GC selections again.
4271 if (!check_gc_consistency()) {
4272 return JNI_EINVAL;
4273 }
4274
4275 if (TieredCompilation) {
4276 set_tiered_flags();
4277 } else {
4278 int max_compilation_policy_choice = 1;
4279 #ifdef COMPILER2
4280 if (is_server_compilation_mode_vm()) {
4281 max_compilation_policy_choice = 2;
4282 }
4283 #endif
4284 // Check if the policy is valid.
4285 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4286 vm_exit_during_initialization(
4287 "Incompatible compilation policy selected", NULL);
4288 }
4289 // Scale CompileThreshold
4290 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4291 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4292 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4293 }
4294 }
4295
4296 #ifdef COMPILER2
4297 #ifndef PRODUCT
4298 if (PrintIdealGraphLevel > 0) {
4299 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4300 }
4301 #endif
4302 #endif
4303
4304 // Set heap size based on available physical memory
4305 set_heap_size();
4306
4307 ArgumentsExt::set_gc_specific_flags();
4308
4309 // Initialize Metaspace flags and alignments
4310 Metaspace::ergo_initialize();
4311
4312 // Set bytecode rewriting flags
4313 set_bytecode_flags();
4314
4315 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4316 jint code = set_aggressive_opts_flags();
4317 if (code != JNI_OK) {
4318 return code;
4319 }
4320
4321 // Turn off biased locking for locking debug mode flags,
4322 // which are subtly different from each other but neither works with
4323 // biased locking
4324 if (UseHeavyMonitors
4325 #ifdef COMPILER1
4326 || !UseFastLocking
4327 #endif // COMPILER1
4328 #if INCLUDE_JVMCI
4329 || !JVMCIUseFastLocking
4330 #endif
4331 ) {
4332 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4333 // flag set to true on command line; warn the user that they
4334 // can't enable biased locking here
4335 warning("Biased Locking is not supported with locking debug flags"
4336 "; ignoring UseBiasedLocking flag." );
4337 }
4338 UseBiasedLocking = false;
4339 }
4340
4341 #ifdef CC_INTERP
4342 // Clear flags not supported on zero.
4343 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4344 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4345 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4346 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4347 #endif // CC_INTERP
4348
4349 #ifdef COMPILER2
4350 if (!EliminateLocks) {
4351 EliminateNestedLocks = false;
4352 }
4353 if (!Inline) {
4354 IncrementalInline = false;
4355 }
4356 #ifndef PRODUCT
4357 if (!IncrementalInline) {
4358 AlwaysIncrementalInline = false;
4359 }
4360 #endif
4361 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4362 // nothing to use the profiling, turn if off
4363 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4364 }
4365 #endif
4366
4367 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4368 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4369 DebugNonSafepoints = true;
4370 }
4371
4372 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4373 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4374 }
4375
4376 if (UseOnStackReplacement && !UseLoopCounter) {
4377 warning("On-stack-replacement requires loop counters; enabling loop counters");
4378 FLAG_SET_DEFAULT(UseLoopCounter, true);
4379 }
4380
4381 #ifndef PRODUCT
4382 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4383 if (use_vm_log()) {
4384 LogVMOutput = true;
4385 }
4386 }
4387 #endif // PRODUCT
4388
4389 if (PrintCommandLineFlags) {
4390 CommandLineFlags::printSetFlags(tty);
4391 }
4392
4393 // Apply CPU specific policy for the BiasedLocking
4394 if (UseBiasedLocking) {
4395 if (!VM_Version::use_biased_locking() &&
4396 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4397 UseBiasedLocking = false;
4398 }
4399 }
4400 #ifdef COMPILER2
4401 if (!UseBiasedLocking || EmitSync != 0) {
4402 UseOptoBiasInlining = false;
4403 }
4404 #endif
4405
4406 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4407 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4408 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4409 } else {
4410 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4411 }
4412
4413 return JNI_OK;
4414 }
4415
4416 jint Arguments::adjust_after_os() {
4417 if (UseNUMA) {
4418 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4419 FLAG_SET_ERGO(bool, UseNUMA, false);
4420 } else if (UseParallelGC || UseParallelOldGC) {
4421 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4422 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4423 }
4424 }
4425 // UseNUMAInterleaving is set to ON for all collectors and
4426 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4427 // such as the parallel collector for Linux and Solaris will
4428 // interleave old gen and survivor spaces on top of NUMA
4429 // allocation policy for the eden space.
4430 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4431 // all platforms and ParallelGC on Windows will interleave all
4432 // of the heap spaces across NUMA nodes.
4433 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4434 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4435 }
4436 }
4437 return JNI_OK;
4438 }
4439
4440 int Arguments::PropertyList_count(SystemProperty* pl) {
4441 int count = 0;
4442 while(pl != NULL) {
4443 count++;
4444 pl = pl->next();
4445 }
4446 return count;
4447 }
4448
4449 // Return the number of readable properties.
4450 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4451 int count = 0;
4452 while(pl != NULL) {
4453 if (pl->is_readable()) {
4454 count++;
4455 }
4456 pl = pl->next();
4457 }
4458 return count;
4459 }
4460
4461 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4462 assert(key != NULL, "just checking");
4463 SystemProperty* prop;
4464 for (prop = pl; prop != NULL; prop = prop->next()) {
4465 if (strcmp(key, prop->key()) == 0) return prop->value();
4466 }
4467 return NULL;
4468 }
4469
4470 // Return the value of the requested property provided that it is a readable property.
4471 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4472 assert(key != NULL, "just checking");
4473 SystemProperty* prop;
4474 // Return the property value if the keys match and the property is not internal or
4475 // it's the special internal property "jdk.boot.class.path.append".
4476 for (prop = pl; prop != NULL; prop = prop->next()) {
4477 if (strcmp(key, prop->key()) == 0) {
4478 if (!prop->internal()) {
4479 return prop->value();
4480 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4481 return prop->value();
4482 } else {
4483 // Property is internal and not jdk.boot.class.path.append so return NULL.
4484 return NULL;
4485 }
4486 }
4487 }
4488 return NULL;
4489 }
4490
4491 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4492 int count = 0;
4493 const char* ret_val = NULL;
4494
4495 while(pl != NULL) {
4496 if(count >= index) {
4497 ret_val = pl->key();
4498 break;
4499 }
4500 count++;
4501 pl = pl->next();
4502 }
4503
4504 return ret_val;
4505 }
4506
4507 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4508 int count = 0;
4509 char* ret_val = NULL;
4510
4511 while(pl != NULL) {
4512 if(count >= index) {
4513 ret_val = pl->value();
4514 break;
4515 }
4516 count++;
4517 pl = pl->next();
4518 }
4519
4520 return ret_val;
4521 }
4522
4523 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4524 SystemProperty* p = *plist;
4525 if (p == NULL) {
4526 *plist = new_p;
4527 } else {
4528 while (p->next() != NULL) {
4529 p = p->next();
4530 }
4531 p->set_next(new_p);
4532 }
4533 }
4534
4535 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4536 bool writeable, bool internal) {
4537 if (plist == NULL)
4538 return;
4539
4540 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4541 PropertyList_add(plist, new_p);
4542 }
4543
4544 void Arguments::PropertyList_add(SystemProperty *element) {
4545 PropertyList_add(&_system_properties, element);
4546 }
4547
4548 // This add maintains unique property key in the list.
4549 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4550 PropertyAppendable append, PropertyWriteable writeable,
4551 PropertyInternal internal) {
4552 if (plist == NULL)
4553 return;
4554
4555 // If property key exist then update with new value.
4556 SystemProperty* prop;
4557 for (prop = *plist; prop != NULL; prop = prop->next()) {
4558 if (strcmp(k, prop->key()) == 0) {
4559 if (append == AppendProperty) {
4560 prop->append_value(v);
4561 } else {
4562 prop->set_value(v);
4563 }
4564 return;
4565 }
4566 }
4567
4568 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4569 }
4570
4571 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4572 // Returns true if all of the source pointed by src has been copied over to
4573 // the destination buffer pointed by buf. Otherwise, returns false.
4574 // Notes:
4575 // 1. If the length (buflen) of the destination buffer excluding the
4576 // NULL terminator character is not long enough for holding the expanded
4577 // pid characters, it also returns false instead of returning the partially
4578 // expanded one.
4579 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4580 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4581 char* buf, size_t buflen) {
4582 const char* p = src;
4583 char* b = buf;
4584 const char* src_end = &src[srclen];
4585 char* buf_end = &buf[buflen - 1];
4586
4587 while (p < src_end && b < buf_end) {
4588 if (*p == '%') {
4589 switch (*(++p)) {
4590 case '%': // "%%" ==> "%"
4591 *b++ = *p++;
4592 break;
4593 case 'p': { // "%p" ==> current process id
4594 // buf_end points to the character before the last character so
4595 // that we could write '\0' to the end of the buffer.
4596 size_t buf_sz = buf_end - b + 1;
4597 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4598
4599 // if jio_snprintf fails or the buffer is not long enough to hold
4600 // the expanded pid, returns false.
4601 if (ret < 0 || ret >= (int)buf_sz) {
4602 return false;
4603 } else {
4604 b += ret;
4605 assert(*b == '\0', "fail in copy_expand_pid");
4606 if (p == src_end && b == buf_end + 1) {
4607 // reach the end of the buffer.
4608 return true;
4609 }
4610 }
4611 p++;
4612 break;
4613 }
4614 default :
4615 *b++ = '%';
4616 }
4617 } else {
4618 *b++ = *p++;
4619 }
4620 }
4621 *b = '\0';
4622 return (p == src_end); // return false if not all of the source was copied
4623 }