1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "logging/logStream.hpp"
39 #include "logging/logTag.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/universe.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 #ifdef VENDOR_URL_VM_BUG
67 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
68 #else
69 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #endif
71 #define DEFAULT_JAVA_LAUNCHER "generic"
72
73 char* Arguments::_jvm_flags_file = NULL;
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 size_t Arguments::_conservative_max_heap_alignment = 0;
82 size_t Arguments::_min_heap_size = 0;
83 Arguments::Mode Arguments::_mode = _mixed;
84 bool Arguments::_java_compiler = false;
85 bool Arguments::_xdebug_mode = false;
86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
88 int Arguments::_sun_java_launcher_pid = -1;
89 bool Arguments::_sun_java_launcher_is_altjvm = false;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
116 PathString *Arguments::_system_boot_class_path = NULL;
117 bool Arguments::_has_jimage = false;
118
119 char* Arguments::_ext_dirs = NULL;
120
121 bool PathString::set_value(const char *value) {
122 if (_value != NULL) {
123 FreeHeap(_value);
124 }
125 _value = AllocateHeap(strlen(value)+1, mtArguments);
126 assert(_value != NULL, "Unable to allocate space for new path value");
127 if (_value != NULL) {
128 strcpy(_value, value);
129 } else {
130 // not able to allocate
131 return false;
132 }
133 return true;
134 }
135
136 void PathString::append_value(const char *value) {
137 char *sp;
138 size_t len = 0;
139 if (value != NULL) {
140 len = strlen(value);
141 if (_value != NULL) {
142 len += strlen(_value);
143 }
144 sp = AllocateHeap(len+2, mtArguments);
145 assert(sp != NULL, "Unable to allocate space for new append path value");
146 if (sp != NULL) {
147 if (_value != NULL) {
148 strcpy(sp, _value);
149 strcat(sp, os::path_separator());
150 strcat(sp, value);
151 FreeHeap(_value);
152 } else {
153 strcpy(sp, value);
154 }
155 _value = sp;
156 }
157 }
158 }
159
160 PathString::PathString(const char* value) {
161 if (value == NULL) {
162 _value = NULL;
163 } else {
164 _value = AllocateHeap(strlen(value)+1, mtArguments);
165 strcpy(_value, value);
166 }
167 }
168
169 PathString::~PathString() {
170 if (_value != NULL) {
171 FreeHeap(_value);
172 _value = NULL;
173 }
174 }
175
176 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
177 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
178 size_t len = strlen(module_name) + 1;
179 _module_name = AllocateHeap(len, mtInternal);
180 strncpy(_module_name, module_name, len); // copy the trailing null
181 _path = new PathString(path);
182 }
183
184 ModulePatchPath::~ModulePatchPath() {
185 if (_module_name != NULL) {
186 FreeHeap(_module_name);
187 _module_name = NULL;
188 }
189 if (_path != NULL) {
190 delete _path;
191 _path = NULL;
192 }
193 }
194
195 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
196 if (key == NULL) {
197 _key = NULL;
198 } else {
199 _key = AllocateHeap(strlen(key)+1, mtArguments);
200 strcpy(_key, key);
201 }
202 _next = NULL;
203 _internal = internal;
204 _writeable = writeable;
205 }
206
207 AgentLibrary::AgentLibrary(const char* name, const char* options,
208 bool is_absolute_path, void* os_lib,
209 bool instrument_lib) {
210 _name = AllocateHeap(strlen(name)+1, mtArguments);
211 strcpy(_name, name);
212 if (options == NULL) {
213 _options = NULL;
214 } else {
215 _options = AllocateHeap(strlen(options)+1, mtArguments);
216 strcpy(_options, options);
217 }
218 _is_absolute_path = is_absolute_path;
219 _os_lib = os_lib;
220 _next = NULL;
221 _state = agent_invalid;
222 _is_static_lib = false;
223 _is_instrument_lib = instrument_lib;
224 }
225
226 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
227 // part of the option string.
228 static bool match_option(const JavaVMOption *option, const char* name,
229 const char** tail) {
230 size_t len = strlen(name);
231 if (strncmp(option->optionString, name, len) == 0) {
232 *tail = option->optionString + len;
233 return true;
234 } else {
235 return false;
236 }
237 }
238
239 // Check if 'option' matches 'name'. No "tail" is allowed.
240 static bool match_option(const JavaVMOption *option, const char* name) {
241 const char* tail = NULL;
242 bool result = match_option(option, name, &tail);
243 if (tail != NULL && *tail == '\0') {
244 return result;
245 } else {
246 return false;
247 }
248 }
249
250 // Return true if any of the strings in null-terminated array 'names' matches.
251 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
252 // the option must match exactly.
253 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
254 bool tail_allowed) {
255 for (/* empty */; *names != NULL; ++names) {
256 if (match_option(option, *names, tail)) {
257 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
258 return true;
259 }
260 }
261 }
262 return false;
263 }
264
265 static void logOption(const char* opt) {
266 if (PrintVMOptions) {
267 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
268 }
269 }
270
271 bool needs_module_property_warning = false;
272
273 #define MODULE_PROPERTY_PREFIX "jdk.module."
274 #define MODULE_PROPERTY_PREFIX_LEN 11
275 #define ADDEXPORTS "addexports"
276 #define ADDEXPORTS_LEN 10
277 #define ADDREADS "addreads"
278 #define ADDREADS_LEN 8
279 #define ADDOPENS "addopens"
280 #define ADDOPENS_LEN 8
281 #define PATCH "patch"
282 #define PATCH_LEN 5
283 #define ADDMODS "addmods"
284 #define ADDMODS_LEN 7
285 #define LIMITMODS "limitmods"
286 #define LIMITMODS_LEN 9
287 #define PATH "path"
288 #define PATH_LEN 4
289 #define UPGRADE_PATH "upgrade.path"
290 #define UPGRADE_PATH_LEN 12
291
292 void Arguments::add_init_library(const char* name, char* options) {
293 _libraryList.add(new AgentLibrary(name, options, false, NULL));
294 }
295
296 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
297 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
298 }
299
300 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
301 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
302 }
303
304 // Late-binding agents not started via arguments
305 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
306 _agentList.add(agentLib);
307 }
308
309 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
310 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
311 }
312
313 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
314 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
315 return ((strncmp(option, property, len) == 0) &&
316 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
317 }
318
319 // Return true if property starts with "jdk.module." and its ensuing chars match
320 // any of the reserved module properties.
321 // property should be passed without the leading "-D".
322 bool Arguments::is_internal_module_property(const char* property) {
323 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
324 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
325 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
326 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
327 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
328 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
329 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
330 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
331 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
332 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
333 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
334 return true;
335 }
336 }
337 return false;
338 }
339
340 // Process java launcher properties.
341 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
342 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
343 // sun.java.launcher.pid is defined.
344 // Must do this before setting up other system properties,
345 // as some of them may depend on launcher type.
346 for (int index = 0; index < args->nOptions; index++) {
347 const JavaVMOption* option = args->options + index;
348 const char* tail;
349
350 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
351 process_java_launcher_argument(tail, option->extraInfo);
352 continue;
353 }
354 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
355 if (strcmp(tail, "true") == 0) {
356 _sun_java_launcher_is_altjvm = true;
357 }
358 continue;
359 }
360 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
361 _sun_java_launcher_pid = atoi(tail);
362 continue;
363 }
364 }
365 }
366
367 // Initialize system properties key and value.
368 void Arguments::init_system_properties() {
369
370 // Set up _system_boot_class_path which is not a property but
371 // relies heavily on argument processing and the jdk.boot.class.path.append
372 // property. It is used to store the underlying system boot class path.
373 _system_boot_class_path = new PathString(NULL);
374
375 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
376 "Java Virtual Machine Specification", false));
377 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
378 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
379 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
380 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
381
382 // Following are JVMTI agent writable properties.
383 // Properties values are set to NULL and they are
384 // os specific they are initialized in os::init_system_properties_values().
385 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
386 _java_library_path = new SystemProperty("java.library.path", NULL, true);
387 _java_home = new SystemProperty("java.home", NULL, true);
388 _java_class_path = new SystemProperty("java.class.path", "", true);
389 // jdk.boot.class.path.append is a non-writeable, internal property.
390 // It can only be set by either:
391 // - -Xbootclasspath/a:
392 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
393 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
394
395 // Add to System Property list.
396 PropertyList_add(&_system_properties, _sun_boot_library_path);
397 PropertyList_add(&_system_properties, _java_library_path);
398 PropertyList_add(&_system_properties, _java_home);
399 PropertyList_add(&_system_properties, _java_class_path);
400 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
401
402 // Set OS specific system properties values
403 os::init_system_properties_values();
404 }
405
406 // Update/Initialize System properties after JDK version number is known
407 void Arguments::init_version_specific_system_properties() {
408 enum { bufsz = 16 };
409 char buffer[bufsz];
410 const char* spec_vendor = "Oracle Corporation";
411 uint32_t spec_version = JDK_Version::current().major_version();
412
413 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
414
415 PropertyList_add(&_system_properties,
416 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
417 PropertyList_add(&_system_properties,
418 new SystemProperty("java.vm.specification.version", buffer, false));
419 PropertyList_add(&_system_properties,
420 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
421 }
422
423 /*
424 * -XX argument processing:
425 *
426 * -XX arguments are defined in several places, such as:
427 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
428 * -XX arguments are parsed in parse_argument().
429 * -XX argument bounds checking is done in check_vm_args_consistency().
430 *
431 * Over time -XX arguments may change. There are mechanisms to handle common cases:
432 *
433 * ALIASED: An option that is simply another name for another option. This is often
434 * part of the process of deprecating a flag, but not all aliases need
435 * to be deprecated.
436 *
437 * Create an alias for an option by adding the old and new option names to the
438 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
439 *
440 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
441 * support may be removed in the future. Both regular and aliased options may be
442 * deprecated.
443 *
444 * Add a deprecation warning for an option (or alias) by adding an entry in the
445 * "special_jvm_flags" table and setting the "deprecated_in" field.
446 * Often an option "deprecated" in one major release will
447 * be made "obsolete" in the next. In this case the entry should also have its
448 * "obsolete_in" field set.
449 *
450 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
451 * on the command line. A warning is printed to let the user know that option might not
452 * be accepted in the future.
453 *
454 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
455 * table and setting the "obsolete_in" field.
456 *
457 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
458 * to the current JDK version. The system will flatly refuse to admit the existence of
459 * the flag. This allows a flag to die automatically over JDK releases.
460 *
461 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
462 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
463 * - Newly obsolete or expired deprecated options should have their global variable
464 * definitions removed (from globals.hpp, etc) and related implementations removed.
465 *
466 * Recommended approach for removing options:
467 *
468 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
469 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
470 *
471 * To remove internal options (e.g. diagnostic, experimental, develop options), use
472 * a 2-step model adding major release numbers to the obsolete and expire columns.
473 *
474 * To change the name of an option, use the alias table as well as a 2-step
475 * model adding major release numbers to the deprecate and expire columns.
476 * Think twice about aliasing commonly used customer options.
477 *
478 * There are times when it is appropriate to leave a future release number as undefined.
479 *
480 * Tests: Aliases should be tested in VMAliasOptions.java.
481 * Deprecated options should be tested in VMDeprecatedOptions.java.
482 */
483
484 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
485 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
486 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
487 // the command-line as usual, but will issue a warning.
488 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
489 // the command-line, while issuing a warning and ignoring the flag value.
490 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
491 // existence of the flag.
492 //
493 // MANUAL CLEANUP ON JDK VERSION UPDATES:
494 // This table ensures that the handling of options will update automatically when the JDK
495 // version is incremented, but the source code needs to be cleanup up manually:
496 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
497 // variable should be removed, as well as users of the variable.
498 // - As "deprecated" options age into "obsolete" options, move the entry into the
499 // "Obsolete Flags" section of the table.
500 // - All expired options should be removed from the table.
501 static SpecialFlag const special_jvm_flags[] = {
502 // -------------- Deprecated Flags --------------
503 // --- Non-alias flags - sorted by obsolete_in then expired_in:
504 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
505 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
506 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
507 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
508 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
509 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
511 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
512 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
513 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
514 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
515 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
516 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
517 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
518
519 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
520 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
523 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
524
525 // -------------- Obsolete Flags - sorted by expired_in --------------
526 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
527 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
528 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
529 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
530 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
531 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
532 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
533 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
534 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
535 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
536 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
537 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
538
539 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
540 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
541 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
542 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
543 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
544 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
545 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
546 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
547 #endif
548
549 { NULL, JDK_Version(0), JDK_Version(0) }
550 };
551
552 // Flags that are aliases for other flags.
553 typedef struct {
554 const char* alias_name;
555 const char* real_name;
556 } AliasedFlag;
557
558 static AliasedFlag const aliased_jvm_flags[] = {
559 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
560 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
561 { NULL, NULL}
562 };
563
564 // NOTE: A compatibility request will be necessary for each alias to be removed.
565 static AliasedLoggingFlag const aliased_logging_flags[] = {
566 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
567 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
568 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
569 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
570 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
571 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
572 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
573 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
574 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
575 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
576 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
577 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
578 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
579 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
580 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
581 };
582
583 #ifndef PRODUCT
584 // These options are removed in jdk9. Remove this code for jdk10.
585 static AliasedFlag const removed_develop_logging_flags[] = {
586 { "TraceClassInitialization", "-Xlog:class+init" },
587 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
588 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
589 { "TraceItables", "-Xlog:itables=debug" },
590 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
591 { "TraceSafepoint", "-Xlog:safepoint=debug" },
592 { "TraceStartupTime", "-Xlog:startuptime" },
593 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
594 { "PrintVtables", "-Xlog:vtables=debug" },
595 { "VerboseVerification", "-Xlog:verification" },
596 { NULL, NULL }
597 };
598 #endif //PRODUCT
599
600 // Return true if "v" is less than "other", where "other" may be "undefined".
601 static bool version_less_than(JDK_Version v, JDK_Version other) {
602 assert(!v.is_undefined(), "must be defined");
603 if (!other.is_undefined() && v.compare(other) >= 0) {
604 return false;
605 } else {
606 return true;
607 }
608 }
609
610 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
611
612 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
613 // Allow extensions to have priority
614 if (lookup_special_flag_ext(flag_name, flag)) {
615 return true;
616 }
617
618 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
619 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
620 flag = special_jvm_flags[i];
621 return true;
622 }
623 }
624 return false;
625 }
626
627 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
628 assert(version != NULL, "Must provide a version buffer");
629 SpecialFlag flag;
630 if (lookup_special_flag(flag_name, flag)) {
631 if (!flag.obsolete_in.is_undefined()) {
632 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
633 *version = flag.obsolete_in;
634 return true;
635 }
636 }
637 }
638 return false;
639 }
640
641 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
642 assert(version != NULL, "Must provide a version buffer");
643 SpecialFlag flag;
644 if (lookup_special_flag(flag_name, flag)) {
645 if (!flag.deprecated_in.is_undefined()) {
646 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
647 version_less_than(JDK_Version::current(), flag.expired_in)) {
648 *version = flag.deprecated_in;
649 return 1;
650 } else {
651 return -1;
652 }
653 }
654 }
655 return 0;
656 }
657
658 #ifndef PRODUCT
659 const char* Arguments::removed_develop_logging_flag_name(const char* name){
660 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
661 const AliasedFlag& flag = removed_develop_logging_flags[i];
662 if (strcmp(flag.alias_name, name) == 0) {
663 return flag.real_name;
664 }
665 }
666 return NULL;
667 }
668 #endif // PRODUCT
669
670 const char* Arguments::real_flag_name(const char *flag_name) {
671 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
672 const AliasedFlag& flag_status = aliased_jvm_flags[i];
673 if (strcmp(flag_status.alias_name, flag_name) == 0) {
674 return flag_status.real_name;
675 }
676 }
677 return flag_name;
678 }
679
680 #ifdef ASSERT
681 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
682 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
683 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
684 return true;
685 }
686 }
687 return false;
688 }
689
690 // Verifies the correctness of the entries in the special_jvm_flags table.
691 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
692 // version being earlier than the deprecation version, then a warning is issued
693 // and verification fails - by returning false. If it is detected that the table
694 // is out of date, with respect to the current version, then a warning is issued
695 // but verification does not fail. This allows the VM to operate when the version
696 // is first updated, without needing to update all the impacted flags at the
697 // same time.
698 static bool verify_special_jvm_flags() {
699 bool success = true;
700 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
701 const SpecialFlag& flag = special_jvm_flags[i];
702 if (lookup_special_flag(flag.name, i)) {
703 warning("Duplicate special flag declaration \"%s\"", flag.name);
704 success = false;
705 }
706 if (flag.deprecated_in.is_undefined() &&
707 flag.obsolete_in.is_undefined()) {
708 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
709 success = false;
710 }
711
712 if (!flag.deprecated_in.is_undefined()) {
713 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
714 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
715 success = false;
716 }
717
718 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
719 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
720 success = false;
721 }
722 }
723
724 if (!flag.obsolete_in.is_undefined()) {
725 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
726 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
727 success = false;
728 }
729
730 // if flag has become obsolete it should not have a "globals" flag defined anymore.
731 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
732 if (Flag::find_flag(flag.name) != NULL) {
733 // Temporarily disable the warning: 8196739
734 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
735 }
736 }
737 }
738
739 if (!flag.expired_in.is_undefined()) {
740 // if flag has become expired it should not have a "globals" flag defined anymore.
741 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
742 if (Flag::find_flag(flag.name) != NULL) {
743 // Temporarily disable the warning: 8196739
744 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
745 }
746 }
747 }
748
749 }
750 return success;
751 }
752 #endif
753
754 // Parses a size specification string.
755 bool Arguments::atojulong(const char *s, julong* result) {
756 julong n = 0;
757
758 // First char must be a digit. Don't allow negative numbers or leading spaces.
759 if (!isdigit(*s)) {
760 return false;
761 }
762
763 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
764 char* remainder;
765 errno = 0;
766 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
767 if (errno != 0) {
768 return false;
769 }
770
771 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
772 if (remainder == s || strlen(remainder) > 1) {
773 return false;
774 }
775
776 switch (*remainder) {
777 case 'T': case 't':
778 *result = n * G * K;
779 // Check for overflow.
780 if (*result/((julong)G * K) != n) return false;
781 return true;
782 case 'G': case 'g':
783 *result = n * G;
784 if (*result/G != n) return false;
785 return true;
786 case 'M': case 'm':
787 *result = n * M;
788 if (*result/M != n) return false;
789 return true;
790 case 'K': case 'k':
791 *result = n * K;
792 if (*result/K != n) return false;
793 return true;
794 case '\0':
795 *result = n;
796 return true;
797 default:
798 return false;
799 }
800 }
801
802 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
803 if (size < min_size) return arg_too_small;
804 if (size > max_size) return arg_too_big;
805 return arg_in_range;
806 }
807
808 // Describe an argument out of range error
809 void Arguments::describe_range_error(ArgsRange errcode) {
810 switch(errcode) {
811 case arg_too_big:
812 jio_fprintf(defaultStream::error_stream(),
813 "The specified size exceeds the maximum "
814 "representable size.\n");
815 break;
816 case arg_too_small:
817 case arg_unreadable:
818 case arg_in_range:
819 // do nothing for now
820 break;
821 default:
822 ShouldNotReachHere();
823 }
824 }
825
826 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
827 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
828 return true;
829 } else {
830 return false;
831 }
832 }
833
834 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
835 char* end;
836 errno = 0;
837 double v = strtod(value, &end);
838 if ((errno != 0) || (*end != 0)) {
839 return false;
840 }
841
842 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
843 return true;
844 }
845 return false;
846 }
847
848 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
849 julong v;
850 int int_v;
851 intx intx_v;
852 bool is_neg = false;
853 Flag* result = Flag::find_flag(name, strlen(name));
854
855 if (result == NULL) {
856 return false;
857 }
858
859 // Check the sign first since atojulong() parses only unsigned values.
860 if (*value == '-') {
861 if (!result->is_intx() && !result->is_int()) {
862 return false;
863 }
864 value++;
865 is_neg = true;
866 }
867 if (!Arguments::atojulong(value, &v)) {
868 return false;
869 }
870 if (result->is_int()) {
871 int_v = (int) v;
872 if (is_neg) {
873 int_v = -int_v;
874 }
875 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
876 } else if (result->is_uint()) {
877 uint uint_v = (uint) v;
878 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
879 } else if (result->is_intx()) {
880 intx_v = (intx) v;
881 if (is_neg) {
882 intx_v = -intx_v;
883 }
884 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
885 } else if (result->is_uintx()) {
886 uintx uintx_v = (uintx) v;
887 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
888 } else if (result->is_uint64_t()) {
889 uint64_t uint64_t_v = (uint64_t) v;
890 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
891 } else if (result->is_size_t()) {
892 size_t size_t_v = (size_t) v;
893 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
894 } else if (result->is_double()) {
895 double double_v = (double) v;
896 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
897 } else {
898 return false;
899 }
900 }
901
902 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
903 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
904 // Contract: CommandLineFlags always returns a pointer that needs freeing.
905 FREE_C_HEAP_ARRAY(char, value);
906 return true;
907 }
908
909 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
910 const char* old_value = "";
911 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
912 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
913 size_t new_len = strlen(new_value);
914 const char* value;
915 char* free_this_too = NULL;
916 if (old_len == 0) {
917 value = new_value;
918 } else if (new_len == 0) {
919 value = old_value;
920 } else {
921 size_t length = old_len + 1 + new_len + 1;
922 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
923 // each new setting adds another LINE to the switch:
924 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
925 value = buf;
926 free_this_too = buf;
927 }
928 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
929 // CommandLineFlags always returns a pointer that needs freeing.
930 FREE_C_HEAP_ARRAY(char, value);
931 if (free_this_too != NULL) {
932 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
933 FREE_C_HEAP_ARRAY(char, free_this_too);
934 }
935 return true;
936 }
937
938 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
939 const char* real_name = real_flag_name(arg);
940 JDK_Version since = JDK_Version();
941 switch (is_deprecated_flag(arg, &since)) {
942 case -1:
943 return NULL; // obsolete or expired, don't process normally
944 case 0:
945 return real_name;
946 case 1: {
947 if (warn) {
948 char version[256];
949 since.to_string(version, sizeof(version));
950 if (real_name != arg) {
951 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
952 arg, version, real_name);
953 } else {
954 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
955 arg, version);
956 }
957 }
958 return real_name;
959 }
960 }
961 ShouldNotReachHere();
962 return NULL;
963 }
964
965 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
966 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
967 // Set tagset string buffer at max size of 256, large enough for any alias tagset
968 const int max_tagset_size = 256;
969 int max_tagset_len = max_tagset_size - 1;
970 char tagset_buffer[max_tagset_size];
971 tagset_buffer[0] = '\0';
972
973 // Write tag-set for aliased logging option, in string list form
974 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
975 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
976 if (i > 0) {
977 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
978 }
979 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
980 }
981 if (!alf.exactMatch) {
982 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
983 }
984 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
985 (on) ? "+" : "-",
986 name,
987 tagset_buffer,
988 (on) ? LogLevel::name(alf.level) : "off");
989 }
990
991 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
992 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
993 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
994 if (strcmp(alf.alias_name, name) == 0) {
995 log_deprecated_flag(name, on, alf);
996 return alf;
997 }
998 }
999 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1000 return a;
1001 }
1002
1003 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1004
1005 // range of acceptable characters spelled out for portability reasons
1006 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1007 #define BUFLEN 255
1008 char name[BUFLEN+1];
1009 char dummy;
1010 const char* real_name;
1011 bool warn_if_deprecated = true;
1012
1013 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1014 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1015 if (alf.alias_name != NULL){
1016 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1017 return true;
1018 }
1019 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1020 if (real_name == NULL) {
1021 return false;
1022 }
1023 return set_bool_flag(real_name, false, origin);
1024 }
1025 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1026 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1027 if (alf.alias_name != NULL){
1028 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1029 return true;
1030 }
1031 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1032 if (real_name == NULL) {
1033 return false;
1034 }
1035 return set_bool_flag(real_name, true, origin);
1036 }
1037
1038 char punct;
1039 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1040 const char* value = strchr(arg, '=') + 1;
1041 Flag* flag;
1042
1043 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1044 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1045 if (alf.alias_name != NULL) {
1046 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1047 return true;
1048 }
1049 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1050 if (real_name == NULL) {
1051 return false;
1052 }
1053 flag = Flag::find_flag(real_name);
1054 if (flag != NULL && flag->is_ccstr()) {
1055 if (flag->ccstr_accumulates()) {
1056 return append_to_string_flag(real_name, value, origin);
1057 } else {
1058 if (value[0] == '\0') {
1059 value = NULL;
1060 }
1061 return set_string_flag(real_name, value, origin);
1062 }
1063 } else {
1064 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1065 }
1066 }
1067
1068 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1069 const char* value = strchr(arg, '=') + 1;
1070 // -XX:Foo:=xxx will reset the string flag to the given value.
1071 if (value[0] == '\0') {
1072 value = NULL;
1073 }
1074 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1075 if (real_name == NULL) {
1076 return false;
1077 }
1078 return set_string_flag(real_name, value, origin);
1079 }
1080
1081 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1082 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1083 #define NUMBER_RANGE "[0123456789eE+-]"
1084 char value[BUFLEN + 1];
1085 char value2[BUFLEN + 1];
1086 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1087 // Looks like a floating-point number -- try again with more lenient format string
1088 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1089 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1090 if (real_name == NULL) {
1091 return false;
1092 }
1093 return set_fp_numeric_flag(real_name, value, origin);
1094 }
1095 }
1096
1097 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1098 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1099 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1100 if (real_name == NULL) {
1101 return false;
1102 }
1103 return set_numeric_flag(real_name, value, origin);
1104 }
1105
1106 return false;
1107 }
1108
1109 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1110 assert(bldarray != NULL, "illegal argument");
1111
1112 if (arg == NULL) {
1113 return;
1114 }
1115
1116 int new_count = *count + 1;
1117
1118 // expand the array and add arg to the last element
1119 if (*bldarray == NULL) {
1120 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1121 } else {
1122 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1123 }
1124 (*bldarray)[*count] = os::strdup_check_oom(arg);
1125 *count = new_count;
1126 }
1127
1128 void Arguments::build_jvm_args(const char* arg) {
1129 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1130 }
1131
1132 void Arguments::build_jvm_flags(const char* arg) {
1133 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1134 }
1135
1136 // utility function to return a string that concatenates all
1137 // strings in a given char** array
1138 const char* Arguments::build_resource_string(char** args, int count) {
1139 if (args == NULL || count == 0) {
1140 return NULL;
1141 }
1142 size_t length = 0;
1143 for (int i = 0; i < count; i++) {
1144 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1145 }
1146 char* s = NEW_RESOURCE_ARRAY(char, length);
1147 char* dst = s;
1148 for (int j = 0; j < count; j++) {
1149 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1150 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1151 dst += offset;
1152 length -= offset;
1153 }
1154 return (const char*) s;
1155 }
1156
1157 void Arguments::print_on(outputStream* st) {
1158 st->print_cr("VM Arguments:");
1159 if (num_jvm_flags() > 0) {
1160 st->print("jvm_flags: "); print_jvm_flags_on(st);
1161 st->cr();
1162 }
1163 if (num_jvm_args() > 0) {
1164 st->print("jvm_args: "); print_jvm_args_on(st);
1165 st->cr();
1166 }
1167 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1168 if (_java_class_path != NULL) {
1169 char* path = _java_class_path->value();
1170 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1171 }
1172 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1173 }
1174
1175 void Arguments::print_summary_on(outputStream* st) {
1176 // Print the command line. Environment variables that are helpful for
1177 // reproducing the problem are written later in the hs_err file.
1178 // flags are from setting file
1179 if (num_jvm_flags() > 0) {
1180 st->print_raw("Settings File: ");
1181 print_jvm_flags_on(st);
1182 st->cr();
1183 }
1184 // args are the command line and environment variable arguments.
1185 st->print_raw("Command Line: ");
1186 if (num_jvm_args() > 0) {
1187 print_jvm_args_on(st);
1188 }
1189 // this is the classfile and any arguments to the java program
1190 if (java_command() != NULL) {
1191 st->print("%s", java_command());
1192 }
1193 st->cr();
1194 }
1195
1196 void Arguments::print_jvm_flags_on(outputStream* st) {
1197 if (_num_jvm_flags > 0) {
1198 for (int i=0; i < _num_jvm_flags; i++) {
1199 st->print("%s ", _jvm_flags_array[i]);
1200 }
1201 }
1202 }
1203
1204 void Arguments::print_jvm_args_on(outputStream* st) {
1205 if (_num_jvm_args > 0) {
1206 for (int i=0; i < _num_jvm_args; i++) {
1207 st->print("%s ", _jvm_args_array[i]);
1208 }
1209 }
1210 }
1211
1212 bool Arguments::process_argument(const char* arg,
1213 jboolean ignore_unrecognized,
1214 Flag::Flags origin) {
1215 JDK_Version since = JDK_Version();
1216
1217 if (parse_argument(arg, origin)) {
1218 return true;
1219 }
1220
1221 // Determine if the flag has '+', '-', or '=' characters.
1222 bool has_plus_minus = (*arg == '+' || *arg == '-');
1223 const char* const argname = has_plus_minus ? arg + 1 : arg;
1224
1225 size_t arg_len;
1226 const char* equal_sign = strchr(argname, '=');
1227 if (equal_sign == NULL) {
1228 arg_len = strlen(argname);
1229 } else {
1230 arg_len = equal_sign - argname;
1231 }
1232
1233 // Only make the obsolete check for valid arguments.
1234 if (arg_len <= BUFLEN) {
1235 // Construct a string which consists only of the argument name without '+', '-', or '='.
1236 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1237 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1238 if (is_obsolete_flag(stripped_argname, &since)) {
1239 char version[256];
1240 since.to_string(version, sizeof(version));
1241 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1242 return true;
1243 }
1244 #ifndef PRODUCT
1245 else {
1246 const char* replacement;
1247 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1248 log_warning(arguments)("%s has been removed. Please use %s instead.",
1249 stripped_argname,
1250 replacement);
1251 return false;
1252 }
1253 }
1254 #endif //PRODUCT
1255 }
1256
1257 // For locked flags, report a custom error message if available.
1258 // Otherwise, report the standard unrecognized VM option.
1259 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1260 if (found_flag != NULL) {
1261 char locked_message_buf[BUFLEN];
1262 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1263 if (strlen(locked_message_buf) == 0) {
1264 if (found_flag->is_bool() && !has_plus_minus) {
1265 jio_fprintf(defaultStream::error_stream(),
1266 "Missing +/- setting for VM option '%s'\n", argname);
1267 } else if (!found_flag->is_bool() && has_plus_minus) {
1268 jio_fprintf(defaultStream::error_stream(),
1269 "Unexpected +/- setting in VM option '%s'\n", argname);
1270 } else {
1271 jio_fprintf(defaultStream::error_stream(),
1272 "Improperly specified VM option '%s'\n", argname);
1273 }
1274 } else {
1275 #ifdef PRODUCT
1276 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1277 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1278 if (ignore_unrecognized && mismatched) {
1279 return true;
1280 }
1281 #endif
1282 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1283 }
1284 } else {
1285 if (ignore_unrecognized) {
1286 return true;
1287 }
1288 jio_fprintf(defaultStream::error_stream(),
1289 "Unrecognized VM option '%s'\n", argname);
1290 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1291 if (fuzzy_matched != NULL) {
1292 jio_fprintf(defaultStream::error_stream(),
1293 "Did you mean '%s%s%s'? ",
1294 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1295 fuzzy_matched->_name,
1296 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1297 }
1298 }
1299
1300 // allow for commandline "commenting out" options like -XX:#+Verbose
1301 return arg[0] == '#';
1302 }
1303
1304 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1305 FILE* stream = fopen(file_name, "rb");
1306 if (stream == NULL) {
1307 if (should_exist) {
1308 jio_fprintf(defaultStream::error_stream(),
1309 "Could not open settings file %s\n", file_name);
1310 return false;
1311 } else {
1312 return true;
1313 }
1314 }
1315
1316 char token[1024];
1317 int pos = 0;
1318
1319 bool in_white_space = true;
1320 bool in_comment = false;
1321 bool in_quote = false;
1322 char quote_c = 0;
1323 bool result = true;
1324
1325 int c = getc(stream);
1326 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1327 if (in_white_space) {
1328 if (in_comment) {
1329 if (c == '\n') in_comment = false;
1330 } else {
1331 if (c == '#') in_comment = true;
1332 else if (!isspace(c)) {
1333 in_white_space = false;
1334 token[pos++] = c;
1335 }
1336 }
1337 } else {
1338 if (c == '\n' || (!in_quote && isspace(c))) {
1339 // token ends at newline, or at unquoted whitespace
1340 // this allows a way to include spaces in string-valued options
1341 token[pos] = '\0';
1342 logOption(token);
1343 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1344 build_jvm_flags(token);
1345 pos = 0;
1346 in_white_space = true;
1347 in_quote = false;
1348 } else if (!in_quote && (c == '\'' || c == '"')) {
1349 in_quote = true;
1350 quote_c = c;
1351 } else if (in_quote && (c == quote_c)) {
1352 in_quote = false;
1353 } else {
1354 token[pos++] = c;
1355 }
1356 }
1357 c = getc(stream);
1358 }
1359 if (pos > 0) {
1360 token[pos] = '\0';
1361 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1362 build_jvm_flags(token);
1363 }
1364 fclose(stream);
1365 return result;
1366 }
1367
1368 //=============================================================================================================
1369 // Parsing of properties (-D)
1370
1371 const char* Arguments::get_property(const char* key) {
1372 return PropertyList_get_value(system_properties(), key);
1373 }
1374
1375 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1376 const char* eq = strchr(prop, '=');
1377 const char* key;
1378 const char* value = "";
1379
1380 if (eq == NULL) {
1381 // property doesn't have a value, thus use passed string
1382 key = prop;
1383 } else {
1384 // property have a value, thus extract it and save to the
1385 // allocated string
1386 size_t key_len = eq - prop;
1387 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1388
1389 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1390 key = tmp_key;
1391
1392 value = &prop[key_len + 1];
1393 }
1394
1395 if (strcmp(key, "java.compiler") == 0) {
1396 process_java_compiler_argument(value);
1397 // Record value in Arguments, but let it get passed to Java.
1398 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1399 strcmp(key, "sun.java.launcher.pid") == 0) {
1400 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1401 // private and are processed in process_sun_java_launcher_properties();
1402 // the sun.java.launcher property is passed on to the java application
1403 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1404 // append is true, writable is true, internal is false
1405 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1406 WriteableProperty, ExternalProperty);
1407 } else {
1408 if (strcmp(key, "sun.java.command") == 0) {
1409 char *old_java_command = _java_command;
1410 _java_command = os::strdup_check_oom(value, mtArguments);
1411 if (old_java_command != NULL) {
1412 os::free(old_java_command);
1413 }
1414 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1415 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1416 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1417 // its value without going through the property list or making a Java call.
1418 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1419 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1420 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1421 os::free((void *)old_java_vendor_url_bug);
1422 }
1423 }
1424
1425 // Create new property and add at the end of the list
1426 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1427 }
1428
1429 if (key != prop) {
1430 // SystemProperty copy passed value, thus free previously allocated
1431 // memory
1432 FreeHeap((void *)key);
1433 }
1434
1435 return true;
1436 }
1437
1438 #if INCLUDE_CDS
1439 void Arguments::check_unsupported_dumping_properties() {
1440 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1441 const char* unsupported_properties[] = { "jdk.module.main",
1442 "jdk.module.limitmods",
1443 "jdk.module.path",
1444 "jdk.module.upgrade.path",
1445 "jdk.module.patch.0" };
1446 const char* unsupported_options[] = { "-m", // cannot use at dump time
1447 "--limit-modules", // ignored at dump time
1448 "--module-path", // ignored at dump time
1449 "--upgrade-module-path", // ignored at dump time
1450 "--patch-module" // ignored at dump time
1451 };
1452 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1453 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1454 // vm will exit with an error message. Otherwise, it will print an informational message if
1455 // -Xlog:cds is enabled.
1456 uint info_idx = 1;
1457 SystemProperty* sp = system_properties();
1458 while (sp != NULL) {
1459 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1460 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1461 if (i < info_idx) {
1462 vm_exit_during_initialization(
1463 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1464 } else {
1465 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1466 unsupported_options[i]);
1467 }
1468 }
1469 }
1470 sp = sp->next();
1471 }
1472
1473 // Check for an exploded module build in use with -Xshare:dump.
1474 if (!has_jimage()) {
1475 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1476 }
1477 }
1478 #endif
1479
1480 //===========================================================================================================
1481 // Setting int/mixed/comp mode flags
1482
1483 void Arguments::set_mode_flags(Mode mode) {
1484 // Set up default values for all flags.
1485 // If you add a flag to any of the branches below,
1486 // add a default value for it here.
1487 set_java_compiler(false);
1488 _mode = mode;
1489
1490 // Ensure Agent_OnLoad has the correct initial values.
1491 // This may not be the final mode; mode may change later in onload phase.
1492 PropertyList_unique_add(&_system_properties, "java.vm.info",
1493 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1494
1495 UseInterpreter = true;
1496 UseCompiler = true;
1497 UseLoopCounter = true;
1498
1499 // Default values may be platform/compiler dependent -
1500 // use the saved values
1501 ClipInlining = Arguments::_ClipInlining;
1502 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1503 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1504 BackgroundCompilation = Arguments::_BackgroundCompilation;
1505 if (TieredCompilation) {
1506 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1507 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1508 }
1509 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1510 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1511 }
1512 }
1513
1514 // Change from defaults based on mode
1515 switch (mode) {
1516 default:
1517 ShouldNotReachHere();
1518 break;
1519 case _int:
1520 UseCompiler = false;
1521 UseLoopCounter = false;
1522 AlwaysCompileLoopMethods = false;
1523 UseOnStackReplacement = false;
1524 break;
1525 case _mixed:
1526 // same as default
1527 break;
1528 case _comp:
1529 UseInterpreter = false;
1530 BackgroundCompilation = false;
1531 ClipInlining = false;
1532 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1533 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1534 // compile a level 4 (C2) and then continue executing it.
1535 if (TieredCompilation) {
1536 Tier3InvokeNotifyFreqLog = 0;
1537 Tier4InvocationThreshold = 0;
1538 }
1539 break;
1540 }
1541 }
1542
1543 // Conflict: required to use shared spaces (-Xshare:on), but
1544 // incompatible command line options were chosen.
1545 static void no_shared_spaces(const char* message) {
1546 if (RequireSharedSpaces) {
1547 jio_fprintf(defaultStream::error_stream(),
1548 "Class data sharing is inconsistent with other specified options.\n");
1549 vm_exit_during_initialization("Unable to use shared archive.", message);
1550 } else {
1551 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1552 }
1553 }
1554
1555 // Returns threshold scaled with the value of scale.
1556 // If scale < 0.0, threshold is returned without scaling.
1557 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1558 if (scale == 1.0 || scale < 0.0) {
1559 return threshold;
1560 } else {
1561 return (intx)(threshold * scale);
1562 }
1563 }
1564
1565 // Returns freq_log scaled with the value of scale.
1566 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1567 // If scale < 0.0, freq_log is returned without scaling.
1568 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1569 // Check if scaling is necessary or if negative value was specified.
1570 if (scale == 1.0 || scale < 0.0) {
1571 return freq_log;
1572 }
1573 // Check values to avoid calculating log2 of 0.
1574 if (scale == 0.0 || freq_log == 0) {
1575 return 0;
1576 }
1577 // Determine the maximum notification frequency value currently supported.
1578 // The largest mask value that the interpreter/C1 can handle is
1579 // of length InvocationCounter::number_of_count_bits. Mask values are always
1580 // one bit shorter then the value of the notification frequency. Set
1581 // max_freq_bits accordingly.
1582 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1583 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1584 if (scaled_freq == 0) {
1585 // Return 0 right away to avoid calculating log2 of 0.
1586 return 0;
1587 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1588 return max_freq_bits;
1589 } else {
1590 return log2_intptr(scaled_freq);
1591 }
1592 }
1593
1594 void Arguments::set_tiered_flags() {
1595 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1596 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1597 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1598 }
1599 if (CompilationPolicyChoice < 2) {
1600 vm_exit_during_initialization(
1601 "Incompatible compilation policy selected", NULL);
1602 }
1603 // Increase the code cache size - tiered compiles a lot more.
1604 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1605 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1606 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1607 }
1608 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1609 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1610 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1611 }
1612 if (!UseInterpreter) { // -Xcomp
1613 Tier3InvokeNotifyFreqLog = 0;
1614 Tier4InvocationThreshold = 0;
1615 }
1616
1617 if (CompileThresholdScaling < 0) {
1618 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1619 }
1620
1621 // Scale tiered compilation thresholds.
1622 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1623 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1624 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1625 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1626
1627 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1628 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1629 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1630 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1631
1632 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1633 // once these thresholds become supported.
1634
1635 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1636 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1637
1638 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1639 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1640
1641 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1642
1643 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1644 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1645 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1646 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1647 }
1648 }
1649
1650 void set_object_alignment() {
1651 // Object alignment.
1652 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1653 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1654 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1655 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1656 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1657 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1658
1659 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1660 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1661
1662 // Oop encoding heap max
1663 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1664
1665 if (SurvivorAlignmentInBytes == 0) {
1666 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1667 }
1668 }
1669
1670 size_t Arguments::max_heap_for_compressed_oops() {
1671 // Avoid sign flip.
1672 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1673 // We need to fit both the NULL page and the heap into the memory budget, while
1674 // keeping alignment constraints of the heap. To guarantee the latter, as the
1675 // NULL page is located before the heap, we pad the NULL page to the conservative
1676 // maximum alignment that the GC may ever impose upon the heap.
1677 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1678 _conservative_max_heap_alignment);
1679
1680 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1681 NOT_LP64(ShouldNotReachHere(); return 0);
1682 }
1683
1684 void Arguments::set_use_compressed_oops() {
1685 #ifndef ZERO
1686 #ifdef _LP64
1687 // MaxHeapSize is not set up properly at this point, but
1688 // the only value that can override MaxHeapSize if we are
1689 // to use UseCompressedOops is InitialHeapSize.
1690 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1691
1692 if (max_heap_size <= max_heap_for_compressed_oops()) {
1693 #if !defined(COMPILER1) || defined(TIERED)
1694 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1695 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1696 }
1697 #endif
1698 } else {
1699 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1700 warning("Max heap size too large for Compressed Oops");
1701 FLAG_SET_DEFAULT(UseCompressedOops, false);
1702 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1703 }
1704 }
1705 #endif // _LP64
1706 #endif // ZERO
1707 }
1708
1709
1710 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1711 // set_use_compressed_oops().
1712 void Arguments::set_use_compressed_klass_ptrs() {
1713 #ifndef ZERO
1714 #ifdef _LP64
1715 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1716 if (!UseCompressedOops) {
1717 if (UseCompressedClassPointers) {
1718 warning("UseCompressedClassPointers requires UseCompressedOops");
1719 }
1720 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1721 } else {
1722 // Turn on UseCompressedClassPointers too
1723 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1724 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1725 }
1726 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1727 if (UseCompressedClassPointers) {
1728 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1729 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1730 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1731 }
1732 }
1733 }
1734 #endif // _LP64
1735 #endif // !ZERO
1736 }
1737
1738 void Arguments::set_conservative_max_heap_alignment() {
1739 // The conservative maximum required alignment for the heap is the maximum of
1740 // the alignments imposed by several sources: any requirements from the heap
1741 // itself, the collector policy and the maximum page size we may run the VM
1742 // with.
1743 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1744 _conservative_max_heap_alignment = MAX4(heap_alignment,
1745 (size_t)os::vm_allocation_granularity(),
1746 os::max_page_size(),
1747 CollectorPolicy::compute_heap_alignment());
1748 }
1749
1750 #ifdef TIERED
1751 bool Arguments::compilation_mode_selected() {
1752 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1753 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1754
1755 }
1756
1757 void Arguments::select_compilation_mode_ergonomically() {
1758 #if defined(_WINDOWS) && !defined(_LP64)
1759 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1760 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1761 }
1762 #endif
1763 if (NeverActAsServerClassMachine) {
1764 set_client_compilation_mode();
1765 }
1766 }
1767 #endif //TIERED
1768
1769 #if INCLUDE_JVMCI
1770 void Arguments::set_jvmci_specific_flags() {
1771 if (UseJVMCICompiler) {
1772 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1773 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1774 }
1775 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1776 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1777 }
1778 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1779 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1780 }
1781 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1782 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1783 }
1784 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1785 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1786 }
1787 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1788 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1789 }
1790 if (TieredStopAtLevel != CompLevel_full_optimization) {
1791 // Currently JVMCI compiler can only work at the full optimization level
1792 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1793 TieredStopAtLevel = CompLevel_full_optimization;
1794 }
1795 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1796 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1797 }
1798 }
1799 }
1800 #endif
1801
1802 jint Arguments::set_ergonomics_flags() {
1803 #ifdef TIERED
1804 if (!compilation_mode_selected()) {
1805 select_compilation_mode_ergonomically();
1806 }
1807 #endif
1808
1809 jint gc_result = GCArguments::initialize();
1810 if (gc_result != JNI_OK) {
1811 return gc_result;
1812 }
1813
1814 #if COMPILER2_OR_JVMCI
1815 // Shared spaces work fine with other GCs but causes bytecode rewriting
1816 // to be disabled, which hurts interpreter performance and decreases
1817 // server performance. When -server is specified, keep the default off
1818 // unless it is asked for. Future work: either add bytecode rewriting
1819 // at link time, or rewrite bytecodes in non-shared methods.
1820 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1821 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1822 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1823 }
1824 #endif
1825
1826 set_conservative_max_heap_alignment();
1827
1828 #ifndef ZERO
1829 #ifdef _LP64
1830 set_use_compressed_oops();
1831
1832 // set_use_compressed_klass_ptrs() must be called after calling
1833 // set_use_compressed_oops().
1834 set_use_compressed_klass_ptrs();
1835
1836 // Also checks that certain machines are slower with compressed oops
1837 // in vm_version initialization code.
1838 #endif // _LP64
1839 #endif // !ZERO
1840
1841 return JNI_OK;
1842 }
1843
1844 void Arguments::set_gc_specific_flags() {
1845 // Set GC flags
1846 GCArguments::arguments()->initialize_flags();
1847 }
1848
1849 julong Arguments::limit_by_allocatable_memory(julong limit) {
1850 julong max_allocatable;
1851 julong result = limit;
1852 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1853 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1854 }
1855 return result;
1856 }
1857
1858 // Use static initialization to get the default before parsing
1859 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1860
1861 void Arguments::set_heap_size() {
1862 julong phys_mem =
1863 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1864 : (julong)MaxRAM;
1865
1866 // Convert deprecated flags
1867 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1868 !FLAG_IS_DEFAULT(MaxRAMFraction))
1869 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1870
1871 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1872 !FLAG_IS_DEFAULT(MinRAMFraction))
1873 MinRAMPercentage = 100.0 / MinRAMFraction;
1874
1875 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1876 !FLAG_IS_DEFAULT(InitialRAMFraction))
1877 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1878
1879 // If the maximum heap size has not been set with -Xmx,
1880 // then set it as fraction of the size of physical memory,
1881 // respecting the maximum and minimum sizes of the heap.
1882 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1883 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1884 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1885 if (reasonable_min < MaxHeapSize) {
1886 // Small physical memory, so use a minimum fraction of it for the heap
1887 reasonable_max = reasonable_min;
1888 } else {
1889 // Not-small physical memory, so require a heap at least
1890 // as large as MaxHeapSize
1891 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1892 }
1893
1894 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1895 // Limit the heap size to ErgoHeapSizeLimit
1896 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1897 }
1898 if (UseCompressedOops) {
1899 // Limit the heap size to the maximum possible when using compressed oops
1900 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1901
1902 // HeapBaseMinAddress can be greater than default but not less than.
1903 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1904 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1905 // matches compressed oops printing flags
1906 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1907 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1908 DefaultHeapBaseMinAddress,
1909 DefaultHeapBaseMinAddress/G,
1910 HeapBaseMinAddress);
1911 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1912 }
1913 }
1914
1915 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1916 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1917 // but it should be not less than default MaxHeapSize.
1918 max_coop_heap -= HeapBaseMinAddress;
1919 }
1920 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1921 }
1922 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1923
1924 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1925 // An initial heap size was specified on the command line,
1926 // so be sure that the maximum size is consistent. Done
1927 // after call to limit_by_allocatable_memory because that
1928 // method might reduce the allocation size.
1929 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1930 }
1931
1932 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1933 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1934 }
1935
1936 // If the minimum or initial heap_size have not been set or requested to be set
1937 // ergonomically, set them accordingly.
1938 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1939 julong reasonable_minimum = (julong)(OldSize + NewSize);
1940
1941 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1942
1943 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1944
1945 if (InitialHeapSize == 0) {
1946 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1947
1948 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1949 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1950
1951 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1952
1953 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1954 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1955 }
1956 // If the minimum heap size has not been set (via -Xms),
1957 // synchronize with InitialHeapSize to avoid errors with the default value.
1958 if (min_heap_size() == 0) {
1959 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1960 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1961 }
1962 }
1963 }
1964
1965 // This option inspects the machine and attempts to set various
1966 // parameters to be optimal for long-running, memory allocation
1967 // intensive jobs. It is intended for machines with large
1968 // amounts of cpu and memory.
1969 jint Arguments::set_aggressive_heap_flags() {
1970 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1971 // VM, but we may not be able to represent the total physical memory
1972 // available (like having 8gb of memory on a box but using a 32bit VM).
1973 // Thus, we need to make sure we're using a julong for intermediate
1974 // calculations.
1975 julong initHeapSize;
1976 julong total_memory = os::physical_memory();
1977
1978 if (total_memory < (julong) 256 * M) {
1979 jio_fprintf(defaultStream::error_stream(),
1980 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1981 vm_exit(1);
1982 }
1983
1984 // The heap size is half of available memory, or (at most)
1985 // all of possible memory less 160mb (leaving room for the OS
1986 // when using ISM). This is the maximum; because adaptive sizing
1987 // is turned on below, the actual space used may be smaller.
1988
1989 initHeapSize = MIN2(total_memory / (julong) 2,
1990 total_memory - (julong) 160 * M);
1991
1992 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1993
1994 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1995 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
1996 return JNI_EINVAL;
1997 }
1998 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
1999 return JNI_EINVAL;
2000 }
2001 // Currently the minimum size and the initial heap sizes are the same.
2002 set_min_heap_size(initHeapSize);
2003 }
2004 if (FLAG_IS_DEFAULT(NewSize)) {
2005 // Make the young generation 3/8ths of the total heap.
2006 if (FLAG_SET_CMDLINE(size_t, NewSize,
2007 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2008 return JNI_EINVAL;
2009 }
2010 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2011 return JNI_EINVAL;
2012 }
2013 }
2014
2015 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2016 FLAG_SET_DEFAULT(UseLargePages, true);
2017 #endif
2018
2019 // Increase some data structure sizes for efficiency
2020 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2021 return JNI_EINVAL;
2022 }
2023 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2024 return JNI_EINVAL;
2025 }
2026 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2027 return JNI_EINVAL;
2028 }
2029
2030 // See the OldPLABSize comment below, but replace 'after promotion'
2031 // with 'after copying'. YoungPLABSize is the size of the survivor
2032 // space per-gc-thread buffers. The default is 4kw.
2033 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2034 return JNI_EINVAL;
2035 }
2036
2037 // OldPLABSize is the size of the buffers in the old gen that
2038 // UseParallelGC uses to promote live data that doesn't fit in the
2039 // survivor spaces. At any given time, there's one for each gc thread.
2040 // The default size is 1kw. These buffers are rarely used, since the
2041 // survivor spaces are usually big enough. For specjbb, however, there
2042 // are occasions when there's lots of live data in the young gen
2043 // and we end up promoting some of it. We don't have a definite
2044 // explanation for why bumping OldPLABSize helps, but the theory
2045 // is that a bigger PLAB results in retaining something like the
2046 // original allocation order after promotion, which improves mutator
2047 // locality. A minor effect may be that larger PLABs reduce the
2048 // number of PLAB allocation events during gc. The value of 8kw
2049 // was arrived at by experimenting with specjbb.
2050 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2051 return JNI_EINVAL;
2052 }
2053
2054 // Enable parallel GC and adaptive generation sizing
2055 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2056 return JNI_EINVAL;
2057 }
2058
2059 // Encourage steady state memory management
2060 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2061 return JNI_EINVAL;
2062 }
2063
2064 // This appears to improve mutator locality
2065 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2066 return JNI_EINVAL;
2067 }
2068
2069 // Get around early Solaris scheduling bug
2070 // (affinity vs other jobs on system)
2071 // but disallow DR and offlining (5008695).
2072 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2073 return JNI_EINVAL;
2074 }
2075
2076 return JNI_OK;
2077 }
2078
2079 // This must be called after ergonomics.
2080 void Arguments::set_bytecode_flags() {
2081 if (!RewriteBytecodes) {
2082 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2083 }
2084 }
2085
2086 // Aggressive optimization flags -XX:+AggressiveOpts
2087 jint Arguments::set_aggressive_opts_flags() {
2088 #ifdef COMPILER2
2089 if (AggressiveUnboxing) {
2090 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2091 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2092 } else if (!EliminateAutoBox) {
2093 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2094 AggressiveUnboxing = false;
2095 }
2096 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2097 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2098 } else if (!DoEscapeAnalysis) {
2099 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2100 AggressiveUnboxing = false;
2101 }
2102 }
2103 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2104 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2105 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2106 }
2107 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2108 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2109 }
2110
2111 // Feed the cache size setting into the JDK
2112 char buffer[1024];
2113 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2114 if (!add_property(buffer)) {
2115 return JNI_ENOMEM;
2116 }
2117 }
2118 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2119 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2120 }
2121 #endif
2122
2123 if (AggressiveOpts) {
2124 // Sample flag setting code
2125 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2126 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2127 // }
2128 }
2129
2130 return JNI_OK;
2131 }
2132
2133 //===========================================================================================================
2134 // Parsing of java.compiler property
2135
2136 void Arguments::process_java_compiler_argument(const char* arg) {
2137 // For backwards compatibility, Djava.compiler=NONE or ""
2138 // causes us to switch to -Xint mode UNLESS -Xdebug
2139 // is also specified.
2140 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2141 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2142 }
2143 }
2144
2145 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2146 _sun_java_launcher = os::strdup_check_oom(launcher);
2147 }
2148
2149 bool Arguments::created_by_java_launcher() {
2150 assert(_sun_java_launcher != NULL, "property must have value");
2151 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2152 }
2153
2154 bool Arguments::sun_java_launcher_is_altjvm() {
2155 return _sun_java_launcher_is_altjvm;
2156 }
2157
2158 //===========================================================================================================
2159 // Parsing of main arguments
2160
2161 #if INCLUDE_JVMCI
2162 // Check consistency of jvmci vm argument settings.
2163 bool Arguments::check_jvmci_args_consistency() {
2164 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2165 }
2166 #endif //INCLUDE_JVMCI
2167
2168 // Check consistency of GC selection
2169 bool Arguments::check_gc_consistency() {
2170 // Ensure that the user has not selected conflicting sets
2171 // of collectors.
2172 uint i = 0;
2173 if (UseSerialGC) i++;
2174 if (UseConcMarkSweepGC) i++;
2175 if (UseParallelGC || UseParallelOldGC) i++;
2176 if (UseG1GC) i++;
2177 if (i > 1) {
2178 jio_fprintf(defaultStream::error_stream(),
2179 "Conflicting collector combinations in option list; "
2180 "please refer to the release notes for the combinations "
2181 "allowed\n");
2182 return false;
2183 }
2184
2185 return true;
2186 }
2187
2188 // Check the consistency of vm_init_args
2189 bool Arguments::check_vm_args_consistency() {
2190 // Method for adding checks for flag consistency.
2191 // The intent is to warn the user of all possible conflicts,
2192 // before returning an error.
2193 // Note: Needs platform-dependent factoring.
2194 bool status = true;
2195
2196 if (TLABRefillWasteFraction == 0) {
2197 jio_fprintf(defaultStream::error_stream(),
2198 "TLABRefillWasteFraction should be a denominator, "
2199 "not " SIZE_FORMAT "\n",
2200 TLABRefillWasteFraction);
2201 status = false;
2202 }
2203
2204 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2205 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2206 }
2207
2208 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2209 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2210 }
2211
2212 if (GCTimeLimit == 100) {
2213 // Turn off gc-overhead-limit-exceeded checks
2214 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2215 }
2216
2217 status = status && check_gc_consistency();
2218
2219 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2220 // insists that we hold the requisite locks so that the iteration is
2221 // MT-safe. For the verification at start-up and shut-down, we don't
2222 // yet have a good way of acquiring and releasing these locks,
2223 // which are not visible at the CollectedHeap level. We want to
2224 // be able to acquire these locks and then do the iteration rather
2225 // than just disable the lock verification. This will be fixed under
2226 // bug 4788986.
2227 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2228 if (VerifyDuringStartup) {
2229 warning("Heap verification at start-up disabled "
2230 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2231 VerifyDuringStartup = false; // Disable verification at start-up
2232 }
2233
2234 if (VerifyBeforeExit) {
2235 warning("Heap verification at shutdown disabled "
2236 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2237 VerifyBeforeExit = false; // Disable verification at shutdown
2238 }
2239 }
2240
2241 if (PrintNMTStatistics) {
2242 #if INCLUDE_NMT
2243 if (MemTracker::tracking_level() == NMT_off) {
2244 #endif // INCLUDE_NMT
2245 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2246 PrintNMTStatistics = false;
2247 #if INCLUDE_NMT
2248 }
2249 #endif
2250 }
2251
2252 #if INCLUDE_JVMCI
2253 status = status && check_jvmci_args_consistency();
2254
2255 if (EnableJVMCI) {
2256 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2257 AddProperty, UnwriteableProperty, InternalProperty);
2258
2259 if (!ScavengeRootsInCode) {
2260 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2261 ScavengeRootsInCode = 1;
2262 }
2263 }
2264 #endif
2265
2266 // Check lower bounds of the code cache
2267 // Template Interpreter code is approximately 3X larger in debug builds.
2268 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2269 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2270 jio_fprintf(defaultStream::error_stream(),
2271 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2272 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2273 status = false;
2274 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2275 jio_fprintf(defaultStream::error_stream(),
2276 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2277 min_code_cache_size/K);
2278 status = false;
2279 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2280 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2281 jio_fprintf(defaultStream::error_stream(),
2282 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2283 CODE_CACHE_SIZE_LIMIT/M);
2284 status = false;
2285 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2288 min_code_cache_size/K);
2289 status = false;
2290 }
2291
2292 #ifdef _LP64
2293 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2294 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2295 }
2296 #endif
2297
2298 #ifndef SUPPORT_RESERVED_STACK_AREA
2299 if (StackReservedPages != 0) {
2300 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2301 warning("Reserved Stack Area not supported on this platform");
2302 }
2303 #endif
2304
2305 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2306 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2307 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2308 }
2309 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2310 }
2311 if (UseCompiler && is_interpreter_only()) {
2312 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2313 warning("UseCompiler disabled due to -Xint.");
2314 }
2315 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2316 }
2317 #ifdef COMPILER2
2318 if (PostLoopMultiversioning && !RangeCheckElimination) {
2319 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2320 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2321 }
2322 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2323 }
2324 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2325 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2326 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2327 }
2328 LoopStripMiningIter = 1;
2329 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2330 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2331 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2332 }
2333 LoopStripMiningIter = 0;
2334 }
2335 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2336 // blind guess
2337 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2338 }
2339 #endif
2340 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2341 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2342 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2343 }
2344 }
2345 return status;
2346 }
2347
2348 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2349 const char* option_type) {
2350 if (ignore) return false;
2351
2352 const char* spacer = " ";
2353 if (option_type == NULL) {
2354 option_type = ++spacer; // Set both to the empty string.
2355 }
2356
2357 if (os::obsolete_option(option)) {
2358 jio_fprintf(defaultStream::error_stream(),
2359 "Obsolete %s%soption: %s\n", option_type, spacer,
2360 option->optionString);
2361 return false;
2362 } else {
2363 jio_fprintf(defaultStream::error_stream(),
2364 "Unrecognized %s%soption: %s\n", option_type, spacer,
2365 option->optionString);
2366 return true;
2367 }
2368 }
2369
2370 static const char* user_assertion_options[] = {
2371 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2372 };
2373
2374 static const char* system_assertion_options[] = {
2375 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2376 };
2377
2378 bool Arguments::parse_uintx(const char* value,
2379 uintx* uintx_arg,
2380 uintx min_size) {
2381
2382 // Check the sign first since atojulong() parses only unsigned values.
2383 bool value_is_positive = !(*value == '-');
2384
2385 if (value_is_positive) {
2386 julong n;
2387 bool good_return = atojulong(value, &n);
2388 if (good_return) {
2389 bool above_minimum = n >= min_size;
2390 bool value_is_too_large = n > max_uintx;
2391
2392 if (above_minimum && !value_is_too_large) {
2393 *uintx_arg = n;
2394 return true;
2395 }
2396 }
2397 }
2398 return false;
2399 }
2400
2401 unsigned int addreads_count = 0;
2402 unsigned int addexports_count = 0;
2403 unsigned int addopens_count = 0;
2404 unsigned int addmods_count = 0;
2405 unsigned int patch_mod_count = 0;
2406
2407 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2408 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2409 char* property = AllocateHeap(prop_len, mtArguments);
2410 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2411 if (ret < 0 || ret >= (int)prop_len) {
2412 FreeHeap(property);
2413 return false;
2414 }
2415 bool added = add_property(property, UnwriteableProperty, internal);
2416 FreeHeap(property);
2417 return added;
2418 }
2419
2420 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2421 const unsigned int props_count_limit = 1000;
2422 const int max_digits = 3;
2423 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2424
2425 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2426 if (count < props_count_limit) {
2427 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2428 char* property = AllocateHeap(prop_len, mtArguments);
2429 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2430 if (ret < 0 || ret >= (int)prop_len) {
2431 FreeHeap(property);
2432 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2433 return false;
2434 }
2435 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2436 FreeHeap(property);
2437 return added;
2438 }
2439
2440 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2441 return false;
2442 }
2443
2444 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2445 julong* long_arg,
2446 julong min_size,
2447 julong max_size) {
2448 if (!atojulong(s, long_arg)) return arg_unreadable;
2449 return check_memory_size(*long_arg, min_size, max_size);
2450 }
2451
2452 // Parse JavaVMInitArgs structure
2453
2454 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2455 const JavaVMInitArgs *java_options_args,
2456 const JavaVMInitArgs *cmd_line_args) {
2457 bool patch_mod_javabase = false;
2458
2459 // Save default settings for some mode flags
2460 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2461 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2462 Arguments::_ClipInlining = ClipInlining;
2463 Arguments::_BackgroundCompilation = BackgroundCompilation;
2464 if (TieredCompilation) {
2465 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2466 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2467 }
2468
2469 // Setup flags for mixed which is the default
2470 set_mode_flags(_mixed);
2471
2472 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2473 // variable (if present).
2474 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2475 if (result != JNI_OK) {
2476 return result;
2477 }
2478
2479 // Parse args structure generated from the command line flags.
2480 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2481 if (result != JNI_OK) {
2482 return result;
2483 }
2484
2485 // Parse args structure generated from the _JAVA_OPTIONS environment
2486 // variable (if present) (mimics classic VM)
2487 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2488 if (result != JNI_OK) {
2489 return result;
2490 }
2491
2492 // We need to ensure processor and memory resources have been properly
2493 // configured - which may rely on arguments we just processed - before
2494 // doing the final argument processing. Any argument processing that
2495 // needs to know about processor and memory resources must occur after
2496 // this point.
2497
2498 os::init_container_support();
2499
2500 // Do final processing now that all arguments have been parsed
2501 result = finalize_vm_init_args(patch_mod_javabase);
2502 if (result != JNI_OK) {
2503 return result;
2504 }
2505
2506 return JNI_OK;
2507 }
2508
2509 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2510 // represents a valid JDWP agent. is_path==true denotes that we
2511 // are dealing with -agentpath (case where name is a path), otherwise with
2512 // -agentlib
2513 bool valid_jdwp_agent(char *name, bool is_path) {
2514 char *_name;
2515 const char *_jdwp = "jdwp";
2516 size_t _len_jdwp, _len_prefix;
2517
2518 if (is_path) {
2519 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2520 return false;
2521 }
2522
2523 _name++; // skip past last path separator
2524 _len_prefix = strlen(JNI_LIB_PREFIX);
2525
2526 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2527 return false;
2528 }
2529
2530 _name += _len_prefix;
2531 _len_jdwp = strlen(_jdwp);
2532
2533 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2534 _name += _len_jdwp;
2535 }
2536 else {
2537 return false;
2538 }
2539
2540 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2541 return false;
2542 }
2543
2544 return true;
2545 }
2546
2547 if (strcmp(name, _jdwp) == 0) {
2548 return true;
2549 }
2550
2551 return false;
2552 }
2553
2554 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2555 // --patch-module=<module>=<file>(<pathsep><file>)*
2556 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2557 // Find the equal sign between the module name and the path specification
2558 const char* module_equal = strchr(patch_mod_tail, '=');
2559 if (module_equal == NULL) {
2560 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2561 return JNI_ERR;
2562 } else {
2563 // Pick out the module name
2564 size_t module_len = module_equal - patch_mod_tail;
2565 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2566 if (module_name != NULL) {
2567 memcpy(module_name, patch_mod_tail, module_len);
2568 *(module_name + module_len) = '\0';
2569 // The path piece begins one past the module_equal sign
2570 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2571 FREE_C_HEAP_ARRAY(char, module_name);
2572 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2573 return JNI_ENOMEM;
2574 }
2575 } else {
2576 return JNI_ENOMEM;
2577 }
2578 }
2579 return JNI_OK;
2580 }
2581
2582 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2583 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2584 // The min and max sizes match the values in globals.hpp, but scaled
2585 // with K. The values have been chosen so that alignment with page
2586 // size doesn't change the max value, which makes the conversions
2587 // back and forth between Xss value and ThreadStackSize value easier.
2588 // The values have also been chosen to fit inside a 32-bit signed type.
2589 const julong min_ThreadStackSize = 0;
2590 const julong max_ThreadStackSize = 1 * M;
2591
2592 const julong min_size = min_ThreadStackSize * K;
2593 const julong max_size = max_ThreadStackSize * K;
2594
2595 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2596
2597 julong size = 0;
2598 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2599 if (errcode != arg_in_range) {
2600 bool silent = (option == NULL); // Allow testing to silence error messages
2601 if (!silent) {
2602 jio_fprintf(defaultStream::error_stream(),
2603 "Invalid thread stack size: %s\n", option->optionString);
2604 describe_range_error(errcode);
2605 }
2606 return JNI_EINVAL;
2607 }
2608
2609 // Internally track ThreadStackSize in units of 1024 bytes.
2610 const julong size_aligned = align_up(size, K);
2611 assert(size <= size_aligned,
2612 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2613 size, size_aligned);
2614
2615 const julong size_in_K = size_aligned / K;
2616 assert(size_in_K < (julong)max_intx,
2617 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2618 size_in_K);
2619
2620 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2621 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2622 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2623 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2624 max_expanded, size_in_K);
2625
2626 *out_ThreadStackSize = (intx)size_in_K;
2627
2628 return JNI_OK;
2629 }
2630
2631 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2632 // For match_option to return remaining or value part of option string
2633 const char* tail;
2634
2635 // iterate over arguments
2636 for (int index = 0; index < args->nOptions; index++) {
2637 bool is_absolute_path = false; // for -agentpath vs -agentlib
2638
2639 const JavaVMOption* option = args->options + index;
2640
2641 if (!match_option(option, "-Djava.class.path", &tail) &&
2642 !match_option(option, "-Dsun.java.command", &tail) &&
2643 !match_option(option, "-Dsun.java.launcher", &tail)) {
2644
2645 // add all jvm options to the jvm_args string. This string
2646 // is used later to set the java.vm.args PerfData string constant.
2647 // the -Djava.class.path and the -Dsun.java.command options are
2648 // omitted from jvm_args string as each have their own PerfData
2649 // string constant object.
2650 build_jvm_args(option->optionString);
2651 }
2652
2653 // -verbose:[class/module/gc/jni]
2654 if (match_option(option, "-verbose", &tail)) {
2655 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2656 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2657 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2658 } else if (!strcmp(tail, ":module")) {
2659 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2660 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2661 } else if (!strcmp(tail, ":gc")) {
2662 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2663 } else if (!strcmp(tail, ":jni")) {
2664 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2665 return JNI_EINVAL;
2666 }
2667 }
2668 // -da / -ea / -disableassertions / -enableassertions
2669 // These accept an optional class/package name separated by a colon, e.g.,
2670 // -da:java.lang.Thread.
2671 } else if (match_option(option, user_assertion_options, &tail, true)) {
2672 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2673 if (*tail == '\0') {
2674 JavaAssertions::setUserClassDefault(enable);
2675 } else {
2676 assert(*tail == ':', "bogus match by match_option()");
2677 JavaAssertions::addOption(tail + 1, enable);
2678 }
2679 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2680 } else if (match_option(option, system_assertion_options, &tail, false)) {
2681 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2682 JavaAssertions::setSystemClassDefault(enable);
2683 // -bootclasspath:
2684 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2685 jio_fprintf(defaultStream::output_stream(),
2686 "-Xbootclasspath is no longer a supported option.\n");
2687 return JNI_EINVAL;
2688 // -bootclasspath/a:
2689 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2690 Arguments::append_sysclasspath(tail);
2691 // -bootclasspath/p:
2692 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2693 jio_fprintf(defaultStream::output_stream(),
2694 "-Xbootclasspath/p is no longer a supported option.\n");
2695 return JNI_EINVAL;
2696 // -Xrun
2697 } else if (match_option(option, "-Xrun", &tail)) {
2698 if (tail != NULL) {
2699 const char* pos = strchr(tail, ':');
2700 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2701 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2702 jio_snprintf(name, len + 1, "%s", tail);
2703
2704 char *options = NULL;
2705 if(pos != NULL) {
2706 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2707 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2708 }
2709 #if !INCLUDE_JVMTI
2710 if (strcmp(name, "jdwp") == 0) {
2711 jio_fprintf(defaultStream::error_stream(),
2712 "Debugging agents are not supported in this VM\n");
2713 return JNI_ERR;
2714 }
2715 #endif // !INCLUDE_JVMTI
2716 add_init_library(name, options);
2717 }
2718 } else if (match_option(option, "--add-reads=", &tail)) {
2719 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2720 return JNI_ENOMEM;
2721 }
2722 } else if (match_option(option, "--add-exports=", &tail)) {
2723 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2724 return JNI_ENOMEM;
2725 }
2726 } else if (match_option(option, "--add-opens=", &tail)) {
2727 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2728 return JNI_ENOMEM;
2729 }
2730 } else if (match_option(option, "--add-modules=", &tail)) {
2731 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2732 return JNI_ENOMEM;
2733 }
2734 } else if (match_option(option, "--limit-modules=", &tail)) {
2735 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2736 return JNI_ENOMEM;
2737 }
2738 } else if (match_option(option, "--module-path=", &tail)) {
2739 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2740 return JNI_ENOMEM;
2741 }
2742 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2743 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2744 return JNI_ENOMEM;
2745 }
2746 } else if (match_option(option, "--patch-module=", &tail)) {
2747 // --patch-module=<module>=<file>(<pathsep><file>)*
2748 int res = process_patch_mod_option(tail, patch_mod_javabase);
2749 if (res != JNI_OK) {
2750 return res;
2751 }
2752 } else if (match_option(option, "--illegal-access=", &tail)) {
2753 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2754 return JNI_ENOMEM;
2755 }
2756 // -agentlib and -agentpath
2757 } else if (match_option(option, "-agentlib:", &tail) ||
2758 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2759 if(tail != NULL) {
2760 const char* pos = strchr(tail, '=');
2761 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2762 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2763 name[len] = '\0';
2764
2765 char *options = NULL;
2766 if(pos != NULL) {
2767 options = os::strdup_check_oom(pos + 1, mtArguments);
2768 }
2769 #if !INCLUDE_JVMTI
2770 if (valid_jdwp_agent(name, is_absolute_path)) {
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Debugging agents are not supported in this VM\n");
2773 return JNI_ERR;
2774 }
2775 #endif // !INCLUDE_JVMTI
2776 add_init_agent(name, options, is_absolute_path);
2777 }
2778 // -javaagent
2779 } else if (match_option(option, "-javaagent:", &tail)) {
2780 #if !INCLUDE_JVMTI
2781 jio_fprintf(defaultStream::error_stream(),
2782 "Instrumentation agents are not supported in this VM\n");
2783 return JNI_ERR;
2784 #else
2785 if (tail != NULL) {
2786 size_t length = strlen(tail) + 1;
2787 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2788 jio_snprintf(options, length, "%s", tail);
2789 add_instrument_agent("instrument", options, false);
2790 // java agents need module java.instrument
2791 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2792 return JNI_ENOMEM;
2793 }
2794 }
2795 #endif // !INCLUDE_JVMTI
2796 // -Xnoclassgc
2797 } else if (match_option(option, "-Xnoclassgc")) {
2798 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2799 return JNI_EINVAL;
2800 }
2801 // -Xconcgc
2802 } else if (match_option(option, "-Xconcgc")) {
2803 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2804 return JNI_EINVAL;
2805 }
2806 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2807 // -Xnoconcgc
2808 } else if (match_option(option, "-Xnoconcgc")) {
2809 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2813 // -Xbatch
2814 } else if (match_option(option, "-Xbatch")) {
2815 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2816 return JNI_EINVAL;
2817 }
2818 // -Xmn for compatibility with other JVM vendors
2819 } else if (match_option(option, "-Xmn", &tail)) {
2820 julong long_initial_young_size = 0;
2821 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2822 if (errcode != arg_in_range) {
2823 jio_fprintf(defaultStream::error_stream(),
2824 "Invalid initial young generation size: %s\n", option->optionString);
2825 describe_range_error(errcode);
2826 return JNI_EINVAL;
2827 }
2828 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 // -Xms
2835 } else if (match_option(option, "-Xms", &tail)) {
2836 julong long_initial_heap_size = 0;
2837 // an initial heap size of 0 means automatically determine
2838 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2839 if (errcode != arg_in_range) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Invalid initial heap size: %s\n", option->optionString);
2842 describe_range_error(errcode);
2843 return JNI_EINVAL;
2844 }
2845 set_min_heap_size((size_t)long_initial_heap_size);
2846 // Currently the minimum size and the initial heap sizes are the same.
2847 // Can be overridden with -XX:InitialHeapSize.
2848 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2849 return JNI_EINVAL;
2850 }
2851 // -Xmx
2852 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2853 julong long_max_heap_size = 0;
2854 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2855 if (errcode != arg_in_range) {
2856 jio_fprintf(defaultStream::error_stream(),
2857 "Invalid maximum heap size: %s\n", option->optionString);
2858 describe_range_error(errcode);
2859 return JNI_EINVAL;
2860 }
2861 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2862 return JNI_EINVAL;
2863 }
2864 // Xmaxf
2865 } else if (match_option(option, "-Xmaxf", &tail)) {
2866 char* err;
2867 int maxf = (int)(strtod(tail, &err) * 100);
2868 if (*err != '\0' || *tail == '\0') {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Bad max heap free percentage size: %s\n",
2871 option->optionString);
2872 return JNI_EINVAL;
2873 } else {
2874 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2875 return JNI_EINVAL;
2876 }
2877 }
2878 // Xminf
2879 } else if (match_option(option, "-Xminf", &tail)) {
2880 char* err;
2881 int minf = (int)(strtod(tail, &err) * 100);
2882 if (*err != '\0' || *tail == '\0') {
2883 jio_fprintf(defaultStream::error_stream(),
2884 "Bad min heap free percentage size: %s\n",
2885 option->optionString);
2886 return JNI_EINVAL;
2887 } else {
2888 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 }
2892 // -Xss
2893 } else if (match_option(option, "-Xss", &tail)) {
2894 intx value = 0;
2895 jint err = parse_xss(option, tail, &value);
2896 if (err != JNI_OK) {
2897 return err;
2898 }
2899 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2903 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2904 julong long_ReservedCodeCacheSize = 0;
2905
2906 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2907 if (errcode != arg_in_range) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Invalid maximum code cache size: %s.\n", option->optionString);
2910 return JNI_EINVAL;
2911 }
2912 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2913 return JNI_EINVAL;
2914 }
2915 // -green
2916 } else if (match_option(option, "-green")) {
2917 jio_fprintf(defaultStream::error_stream(),
2918 "Green threads support not available\n");
2919 return JNI_EINVAL;
2920 // -native
2921 } else if (match_option(option, "-native")) {
2922 // HotSpot always uses native threads, ignore silently for compatibility
2923 // -Xrs
2924 } else if (match_option(option, "-Xrs")) {
2925 // Classic/EVM option, new functionality
2926 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 // -Xprof
2930 } else if (match_option(option, "-Xprof")) {
2931 char version[256];
2932 // Obsolete in JDK 10
2933 JDK_Version::jdk(10).to_string(version, sizeof(version));
2934 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2935 // -Xconcurrentio
2936 } else if (match_option(option, "-Xconcurrentio")) {
2937 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2947 return JNI_EINVAL;
2948 }
2949 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2950 return JNI_EINVAL;
2951 }
2952
2953 // -Xinternalversion
2954 } else if (match_option(option, "-Xinternalversion")) {
2955 jio_fprintf(defaultStream::output_stream(), "%s\n",
2956 VM_Version::internal_vm_info_string());
2957 vm_exit(0);
2958 #ifndef PRODUCT
2959 // -Xprintflags
2960 } else if (match_option(option, "-Xprintflags")) {
2961 CommandLineFlags::printFlags(tty, false);
2962 vm_exit(0);
2963 #endif
2964 // -D
2965 } else if (match_option(option, "-D", &tail)) {
2966 const char* value;
2967 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2968 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2969 // abort if -Djava.endorsed.dirs is set
2970 jio_fprintf(defaultStream::output_stream(),
2971 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2972 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2973 return JNI_EINVAL;
2974 }
2975 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2976 *value != '\0' && strcmp(value, "\"\"") != 0) {
2977 // abort if -Djava.ext.dirs is set
2978 jio_fprintf(defaultStream::output_stream(),
2979 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2980 return JNI_EINVAL;
2981 }
2982 // Check for module related properties. They must be set using the modules
2983 // options. For example: use "--add-modules=java.sql", not
2984 // "-Djdk.module.addmods=java.sql"
2985 if (is_internal_module_property(option->optionString + 2)) {
2986 needs_module_property_warning = true;
2987 continue;
2988 }
2989
2990 if (!add_property(tail)) {
2991 return JNI_ENOMEM;
2992 }
2993 // Out of the box management support
2994 if (match_option(option, "-Dcom.sun.management", &tail)) {
2995 #if INCLUDE_MANAGEMENT
2996 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2997 return JNI_EINVAL;
2998 }
2999 // management agent in module jdk.management.agent
3000 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3001 return JNI_ENOMEM;
3002 }
3003 #else
3004 jio_fprintf(defaultStream::output_stream(),
3005 "-Dcom.sun.management is not supported in this VM.\n");
3006 return JNI_ERR;
3007 #endif
3008 }
3009 // -Xint
3010 } else if (match_option(option, "-Xint")) {
3011 set_mode_flags(_int);
3012 // -Xmixed
3013 } else if (match_option(option, "-Xmixed")) {
3014 set_mode_flags(_mixed);
3015 // -Xcomp
3016 } else if (match_option(option, "-Xcomp")) {
3017 // for testing the compiler; turn off all flags that inhibit compilation
3018 set_mode_flags(_comp);
3019 // -Xshare:dump
3020 } else if (match_option(option, "-Xshare:dump")) {
3021 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3022 return JNI_EINVAL;
3023 }
3024 set_mode_flags(_int); // Prevent compilation, which creates objects
3025 // -Xshare:on
3026 } else if (match_option(option, "-Xshare:on")) {
3027 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3028 return JNI_EINVAL;
3029 }
3030 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033 // -Xshare:auto
3034 } else if (match_option(option, "-Xshare:auto")) {
3035 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3036 return JNI_EINVAL;
3037 }
3038 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 // -Xshare:off
3042 } else if (match_option(option, "-Xshare:off")) {
3043 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3044 return JNI_EINVAL;
3045 }
3046 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 // -Xverify
3050 } else if (match_option(option, "-Xverify", &tail)) {
3051 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3052 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3056 return JNI_EINVAL;
3057 }
3058 } else if (strcmp(tail, ":remote") == 0) {
3059 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3060 return JNI_EINVAL;
3061 }
3062 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3063 return JNI_EINVAL;
3064 }
3065 } else if (strcmp(tail, ":none") == 0) {
3066 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3067 return JNI_EINVAL;
3068 }
3069 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3070 return JNI_EINVAL;
3071 }
3072 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3073 return JNI_EINVAL;
3074 }
3075 // -Xdebug
3076 } else if (match_option(option, "-Xdebug")) {
3077 // note this flag has been used, then ignore
3078 set_xdebug_mode(true);
3079 // -Xnoagent
3080 } else if (match_option(option, "-Xnoagent")) {
3081 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3082 } else if (match_option(option, "-Xloggc:", &tail)) {
3083 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3084 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3085 _gc_log_filename = os::strdup_check_oom(tail);
3086 } else if (match_option(option, "-Xlog", &tail)) {
3087 bool ret = false;
3088 if (strcmp(tail, ":help") == 0) {
3089 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3090 vm_exit(0);
3091 } else if (strcmp(tail, ":disable") == 0) {
3092 LogConfiguration::disable_logging();
3093 ret = true;
3094 } else if (*tail == '\0') {
3095 ret = LogConfiguration::parse_command_line_arguments();
3096 assert(ret, "-Xlog without arguments should never fail to parse");
3097 } else if (*tail == ':') {
3098 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3099 }
3100 if (ret == false) {
3101 jio_fprintf(defaultStream::error_stream(),
3102 "Invalid -Xlog option '-Xlog%s'\n",
3103 tail);
3104 return JNI_EINVAL;
3105 }
3106 // JNI hooks
3107 } else if (match_option(option, "-Xcheck", &tail)) {
3108 if (!strcmp(tail, ":jni")) {
3109 #if !INCLUDE_JNI_CHECK
3110 warning("JNI CHECKING is not supported in this VM");
3111 #else
3112 CheckJNICalls = true;
3113 #endif // INCLUDE_JNI_CHECK
3114 } else if (is_bad_option(option, args->ignoreUnrecognized,
3115 "check")) {
3116 return JNI_EINVAL;
3117 }
3118 } else if (match_option(option, "vfprintf")) {
3119 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3120 } else if (match_option(option, "exit")) {
3121 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3122 } else if (match_option(option, "abort")) {
3123 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3124 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3125 // and the last option wins.
3126 } else if (match_option(option, "-XX:+NeverTenure")) {
3127 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3128 return JNI_EINVAL;
3129 }
3130 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3134 return JNI_EINVAL;
3135 }
3136 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3137 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3138 return JNI_EINVAL;
3139 }
3140 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3141 return JNI_EINVAL;
3142 }
3143 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3144 return JNI_EINVAL;
3145 }
3146 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3147 uintx max_tenuring_thresh = 0;
3148 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3149 jio_fprintf(defaultStream::error_stream(),
3150 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3151 return JNI_EINVAL;
3152 }
3153
3154 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157
3158 if (MaxTenuringThreshold == 0) {
3159 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3163 return JNI_EINVAL;
3164 }
3165 } else {
3166 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3167 return JNI_EINVAL;
3168 }
3169 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3170 return JNI_EINVAL;
3171 }
3172 }
3173 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3174 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3181 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3182 return JNI_EINVAL;
3183 }
3184 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3188 #if defined(DTRACE_ENABLED)
3189 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 #else // defined(DTRACE_ENABLED)
3202 jio_fprintf(defaultStream::error_stream(),
3203 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3204 return JNI_EINVAL;
3205 #endif // defined(DTRACE_ENABLED)
3206 #ifdef ASSERT
3207 } else if (match_option(option, "-XX:+FullGCALot")) {
3208 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 // disable scavenge before parallel mark-compact
3212 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3213 return JNI_EINVAL;
3214 }
3215 #endif
3216 #if !INCLUDE_MANAGEMENT
3217 } else if (match_option(option, "-XX:+ManagementServer")) {
3218 jio_fprintf(defaultStream::error_stream(),
3219 "ManagementServer is not supported in this VM.\n");
3220 return JNI_ERR;
3221 #endif // INCLUDE_MANAGEMENT
3222 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3223 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3224 // already been handled
3225 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3226 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3227 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3228 return JNI_EINVAL;
3229 }
3230 }
3231 // Unknown option
3232 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3233 return JNI_ERR;
3234 }
3235 }
3236
3237 // PrintSharedArchiveAndExit will turn on
3238 // -Xshare:on
3239 // -Xlog:class+path=info
3240 if (PrintSharedArchiveAndExit) {
3241 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3242 return JNI_EINVAL;
3243 }
3244 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3245 return JNI_EINVAL;
3246 }
3247 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3248 }
3249
3250 // Change the default value for flags which have different default values
3251 // when working with older JDKs.
3252 #ifdef LINUX
3253 if (JDK_Version::current().compare_major(6) <= 0 &&
3254 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3255 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3256 }
3257 #endif // LINUX
3258 fix_appclasspath();
3259 return JNI_OK;
3260 }
3261
3262 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3263 // For java.base check for duplicate --patch-module options being specified on the command line.
3264 // This check is only required for java.base, all other duplicate module specifications
3265 // will be checked during module system initialization. The module system initialization
3266 // will throw an ExceptionInInitializerError if this situation occurs.
3267 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3268 if (*patch_mod_javabase) {
3269 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3270 } else {
3271 *patch_mod_javabase = true;
3272 }
3273 }
3274
3275 // Create GrowableArray lazily, only if --patch-module has been specified
3276 if (_patch_mod_prefix == NULL) {
3277 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3278 }
3279
3280 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3281 }
3282
3283 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3284 //
3285 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3286 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3287 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3288 // path is treated as the current directory.
3289 //
3290 // This causes problems with CDS, which requires that all directories specified in the classpath
3291 // must be empty. In most cases, applications do NOT want to load classes from the current
3292 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3293 // scripts compatible with CDS.
3294 void Arguments::fix_appclasspath() {
3295 if (IgnoreEmptyClassPaths) {
3296 const char separator = *os::path_separator();
3297 const char* src = _java_class_path->value();
3298
3299 // skip over all the leading empty paths
3300 while (*src == separator) {
3301 src ++;
3302 }
3303
3304 char* copy = os::strdup_check_oom(src, mtArguments);
3305
3306 // trim all trailing empty paths
3307 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3308 *tail = '\0';
3309 }
3310
3311 char from[3] = {separator, separator, '\0'};
3312 char to [2] = {separator, '\0'};
3313 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3314 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3315 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3316 }
3317
3318 _java_class_path->set_writeable_value(copy);
3319 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3320 }
3321 }
3322
3323 static bool has_jar_files(const char* directory) {
3324 DIR* dir = os::opendir(directory);
3325 if (dir == NULL) return false;
3326
3327 struct dirent *entry;
3328 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3329 bool hasJarFile = false;
3330 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3331 const char* name = entry->d_name;
3332 const char* ext = name + strlen(name) - 4;
3333 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3334 }
3335 FREE_C_HEAP_ARRAY(char, dbuf);
3336 os::closedir(dir);
3337 return hasJarFile ;
3338 }
3339
3340 static int check_non_empty_dirs(const char* path) {
3341 const char separator = *os::path_separator();
3342 const char* const end = path + strlen(path);
3343 int nonEmptyDirs = 0;
3344 while (path < end) {
3345 const char* tmp_end = strchr(path, separator);
3346 if (tmp_end == NULL) {
3347 if (has_jar_files(path)) {
3348 nonEmptyDirs++;
3349 jio_fprintf(defaultStream::output_stream(),
3350 "Non-empty directory: %s\n", path);
3351 }
3352 path = end;
3353 } else {
3354 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3355 memcpy(dirpath, path, tmp_end - path);
3356 dirpath[tmp_end - path] = '\0';
3357 if (has_jar_files(dirpath)) {
3358 nonEmptyDirs++;
3359 jio_fprintf(defaultStream::output_stream(),
3360 "Non-empty directory: %s\n", dirpath);
3361 }
3362 FREE_C_HEAP_ARRAY(char, dirpath);
3363 path = tmp_end + 1;
3364 }
3365 }
3366 return nonEmptyDirs;
3367 }
3368
3369 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3370 // check if the default lib/endorsed directory exists; if so, error
3371 char path[JVM_MAXPATHLEN];
3372 const char* fileSep = os::file_separator();
3373 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3374
3375 if (CheckEndorsedAndExtDirs) {
3376 int nonEmptyDirs = 0;
3377 // check endorsed directory
3378 nonEmptyDirs += check_non_empty_dirs(path);
3379 // check the extension directories
3380 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3381 if (nonEmptyDirs > 0) {
3382 return JNI_ERR;
3383 }
3384 }
3385
3386 DIR* dir = os::opendir(path);
3387 if (dir != NULL) {
3388 jio_fprintf(defaultStream::output_stream(),
3389 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3390 "in modular form will be supported via the concept of upgradeable modules.\n");
3391 os::closedir(dir);
3392 return JNI_ERR;
3393 }
3394
3395 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3396 dir = os::opendir(path);
3397 if (dir != NULL) {
3398 jio_fprintf(defaultStream::output_stream(),
3399 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3400 "Use -classpath instead.\n.");
3401 os::closedir(dir);
3402 return JNI_ERR;
3403 }
3404
3405 // This must be done after all arguments have been processed
3406 // and the container support has been initialized since AggressiveHeap
3407 // relies on the amount of total memory available.
3408 if (AggressiveHeap) {
3409 jint result = set_aggressive_heap_flags();
3410 if (result != JNI_OK) {
3411 return result;
3412 }
3413 }
3414
3415 // This must be done after all arguments have been processed.
3416 // java_compiler() true means set to "NONE" or empty.
3417 if (java_compiler() && !xdebug_mode()) {
3418 // For backwards compatibility, we switch to interpreted mode if
3419 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3420 // not specified.
3421 set_mode_flags(_int);
3422 }
3423
3424 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3425 // but like -Xint, leave compilation thresholds unaffected.
3426 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3427 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3428 set_mode_flags(_int);
3429 }
3430
3431 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3432 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3433 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3434 }
3435
3436 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3437 // Don't degrade server performance for footprint
3438 if (FLAG_IS_DEFAULT(UseLargePages) &&
3439 MaxHeapSize < LargePageHeapSizeThreshold) {
3440 // No need for large granularity pages w/small heaps.
3441 // Note that large pages are enabled/disabled for both the
3442 // Java heap and the code cache.
3443 FLAG_SET_DEFAULT(UseLargePages, false);
3444 }
3445
3446 #elif defined(COMPILER2)
3447 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3448 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3449 }
3450 #endif
3451
3452 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3453 UNSUPPORTED_OPTION(ProfileInterpreter);
3454 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3455 #endif
3456
3457 #ifndef TIERED
3458 // Tiered compilation is undefined.
3459 UNSUPPORTED_OPTION(TieredCompilation);
3460 #endif
3461
3462 #if INCLUDE_JVMCI
3463 if (EnableJVMCI &&
3464 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3465 return JNI_ENOMEM;
3466 }
3467 #endif
3468
3469 if (!check_vm_args_consistency()) {
3470 return JNI_ERR;
3471 }
3472
3473 #if INCLUDE_JVMCI
3474 if (UseJVMCICompiler) {
3475 Compilation_mode = CompMode_server;
3476 }
3477 #endif
3478
3479 #if INCLUDE_CDS
3480 if (DumpSharedSpaces) {
3481 // Disable biased locking now as it interferes with the clean up of
3482 // the archived Klasses and Java string objects (at dump time only).
3483 UseBiasedLocking = false;
3484 }
3485 if (UseSharedSpaces && patch_mod_javabase) {
3486 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3487 }
3488 #endif
3489
3490 return JNI_OK;
3491 }
3492
3493 // Helper class for controlling the lifetime of JavaVMInitArgs
3494 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3495 // deleted on the destruction of the ScopedVMInitArgs object.
3496 class ScopedVMInitArgs : public StackObj {
3497 private:
3498 JavaVMInitArgs _args;
3499 char* _container_name;
3500 bool _is_set;
3501 char* _vm_options_file_arg;
3502
3503 public:
3504 ScopedVMInitArgs(const char *container_name) {
3505 _args.version = JNI_VERSION_1_2;
3506 _args.nOptions = 0;
3507 _args.options = NULL;
3508 _args.ignoreUnrecognized = false;
3509 _container_name = (char *)container_name;
3510 _is_set = false;
3511 _vm_options_file_arg = NULL;
3512 }
3513
3514 // Populates the JavaVMInitArgs object represented by this
3515 // ScopedVMInitArgs object with the arguments in options. The
3516 // allocated memory is deleted by the destructor. If this method
3517 // returns anything other than JNI_OK, then this object is in a
3518 // partially constructed state, and should be abandoned.
3519 jint set_args(GrowableArray<JavaVMOption>* options) {
3520 _is_set = true;
3521 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3522 JavaVMOption, options->length(), mtArguments);
3523 if (options_arr == NULL) {
3524 return JNI_ENOMEM;
3525 }
3526 _args.options = options_arr;
3527
3528 for (int i = 0; i < options->length(); i++) {
3529 options_arr[i] = options->at(i);
3530 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3531 if (options_arr[i].optionString == NULL) {
3532 // Rely on the destructor to do cleanup.
3533 _args.nOptions = i;
3534 return JNI_ENOMEM;
3535 }
3536 }
3537
3538 _args.nOptions = options->length();
3539 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3540 return JNI_OK;
3541 }
3542
3543 JavaVMInitArgs* get() { return &_args; }
3544 char* container_name() { return _container_name; }
3545 bool is_set() { return _is_set; }
3546 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3547 char* vm_options_file_arg() { return _vm_options_file_arg; }
3548
3549 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3550 if (_vm_options_file_arg != NULL) {
3551 os::free(_vm_options_file_arg);
3552 }
3553 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3554 }
3555
3556 ~ScopedVMInitArgs() {
3557 if (_vm_options_file_arg != NULL) {
3558 os::free(_vm_options_file_arg);
3559 }
3560 if (_args.options == NULL) return;
3561 for (int i = 0; i < _args.nOptions; i++) {
3562 os::free(_args.options[i].optionString);
3563 }
3564 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3565 }
3566
3567 // Insert options into this option list, to replace option at
3568 // vm_options_file_pos (-XX:VMOptionsFile)
3569 jint insert(const JavaVMInitArgs* args,
3570 const JavaVMInitArgs* args_to_insert,
3571 const int vm_options_file_pos) {
3572 assert(_args.options == NULL, "shouldn't be set yet");
3573 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3574 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3575
3576 int length = args->nOptions + args_to_insert->nOptions - 1;
3577 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3578 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3579 for (int i = 0; i < args->nOptions; i++) {
3580 if (i == vm_options_file_pos) {
3581 // insert the new options starting at the same place as the
3582 // -XX:VMOptionsFile option
3583 for (int j = 0; j < args_to_insert->nOptions; j++) {
3584 options->push(args_to_insert->options[j]);
3585 }
3586 } else {
3587 options->push(args->options[i]);
3588 }
3589 }
3590 // make into options array
3591 jint result = set_args(options);
3592 delete options;
3593 return result;
3594 }
3595 };
3596
3597 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3598 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3599 }
3600
3601 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3602 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3603 }
3604
3605 jint Arguments::parse_options_environment_variable(const char* name,
3606 ScopedVMInitArgs* vm_args) {
3607 char *buffer = ::getenv(name);
3608
3609 // Don't check this environment variable if user has special privileges
3610 // (e.g. unix su command).
3611 if (buffer == NULL || os::have_special_privileges()) {
3612 return JNI_OK;
3613 }
3614
3615 if ((buffer = os::strdup(buffer)) == NULL) {
3616 return JNI_ENOMEM;
3617 }
3618
3619 jio_fprintf(defaultStream::error_stream(),
3620 "Picked up %s: %s\n", name, buffer);
3621
3622 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3623
3624 os::free(buffer);
3625 return retcode;
3626 }
3627
3628 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3629 // read file into buffer
3630 int fd = ::open(file_name, O_RDONLY);
3631 if (fd < 0) {
3632 jio_fprintf(defaultStream::error_stream(),
3633 "Could not open options file '%s'\n",
3634 file_name);
3635 return JNI_ERR;
3636 }
3637
3638 struct stat stbuf;
3639 int retcode = os::stat(file_name, &stbuf);
3640 if (retcode != 0) {
3641 jio_fprintf(defaultStream::error_stream(),
3642 "Could not stat options file '%s'\n",
3643 file_name);
3644 os::close(fd);
3645 return JNI_ERR;
3646 }
3647
3648 if (stbuf.st_size == 0) {
3649 // tell caller there is no option data and that is ok
3650 os::close(fd);
3651 return JNI_OK;
3652 }
3653
3654 // '+ 1' for NULL termination even with max bytes
3655 size_t bytes_alloc = stbuf.st_size + 1;
3656
3657 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3658 if (NULL == buf) {
3659 jio_fprintf(defaultStream::error_stream(),
3660 "Could not allocate read buffer for options file parse\n");
3661 os::close(fd);
3662 return JNI_ENOMEM;
3663 }
3664
3665 memset(buf, 0, bytes_alloc);
3666
3667 // Fill buffer
3668 // Use ::read() instead of os::read because os::read()
3669 // might do a thread state transition
3670 // and it is too early for that here
3671
3672 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3673 os::close(fd);
3674 if (bytes_read < 0) {
3675 FREE_C_HEAP_ARRAY(char, buf);
3676 jio_fprintf(defaultStream::error_stream(),
3677 "Could not read options file '%s'\n", file_name);
3678 return JNI_ERR;
3679 }
3680
3681 if (bytes_read == 0) {
3682 // tell caller there is no option data and that is ok
3683 FREE_C_HEAP_ARRAY(char, buf);
3684 return JNI_OK;
3685 }
3686
3687 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3688
3689 FREE_C_HEAP_ARRAY(char, buf);
3690 return retcode;
3691 }
3692
3693 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3694 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3695
3696 // some pointers to help with parsing
3697 char *buffer_end = buffer + buf_len;
3698 char *opt_hd = buffer;
3699 char *wrt = buffer;
3700 char *rd = buffer;
3701
3702 // parse all options
3703 while (rd < buffer_end) {
3704 // skip leading white space from the input string
3705 while (rd < buffer_end && isspace(*rd)) {
3706 rd++;
3707 }
3708
3709 if (rd >= buffer_end) {
3710 break;
3711 }
3712
3713 // Remember this is where we found the head of the token.
3714 opt_hd = wrt;
3715
3716 // Tokens are strings of non white space characters separated
3717 // by one or more white spaces.
3718 while (rd < buffer_end && !isspace(*rd)) {
3719 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3720 int quote = *rd; // matching quote to look for
3721 rd++; // don't copy open quote
3722 while (rd < buffer_end && *rd != quote) {
3723 // include everything (even spaces)
3724 // up until the close quote
3725 *wrt++ = *rd++; // copy to option string
3726 }
3727
3728 if (rd < buffer_end) {
3729 rd++; // don't copy close quote
3730 } else {
3731 // did not see closing quote
3732 jio_fprintf(defaultStream::error_stream(),
3733 "Unmatched quote in %s\n", name);
3734 delete options;
3735 return JNI_ERR;
3736 }
3737 } else {
3738 *wrt++ = *rd++; // copy to option string
3739 }
3740 }
3741
3742 // steal a white space character and set it to NULL
3743 *wrt++ = '\0';
3744 // We now have a complete token
3745
3746 JavaVMOption option;
3747 option.optionString = opt_hd;
3748 option.extraInfo = NULL;
3749
3750 options->append(option); // Fill in option
3751
3752 rd++; // Advance to next character
3753 }
3754
3755 // Fill out JavaVMInitArgs structure.
3756 jint status = vm_args->set_args(options);
3757
3758 delete options;
3759 return status;
3760 }
3761
3762 void Arguments::set_shared_spaces_flags() {
3763 if (DumpSharedSpaces) {
3764 if (FailOverToOldVerifier) {
3765 // Don't fall back to the old verifier on verification failure. If a
3766 // class fails verification with the split verifier, it might fail the
3767 // CDS runtime verifier constraint check. In that case, we don't want
3768 // to share the class. We only archive classes that pass the split verifier.
3769 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3770 }
3771
3772 if (RequireSharedSpaces) {
3773 warning("Cannot dump shared archive while using shared archive");
3774 }
3775 UseSharedSpaces = false;
3776 #ifdef _LP64
3777 if (!UseCompressedOops || !UseCompressedClassPointers) {
3778 vm_exit_during_initialization(
3779 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3780 }
3781 } else {
3782 if (!UseCompressedOops || !UseCompressedClassPointers) {
3783 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3784 }
3785 #endif
3786 }
3787 }
3788
3789 // Sharing support
3790 // Construct the path to the archive
3791 static char* get_shared_archive_path() {
3792 char *shared_archive_path;
3793 if (SharedArchiveFile == NULL) {
3794 char jvm_path[JVM_MAXPATHLEN];
3795 os::jvm_path(jvm_path, sizeof(jvm_path));
3796 char *end = strrchr(jvm_path, *os::file_separator());
3797 if (end != NULL) *end = '\0';
3798 size_t jvm_path_len = strlen(jvm_path);
3799 size_t file_sep_len = strlen(os::file_separator());
3800 const size_t len = jvm_path_len + file_sep_len + 20;
3801 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3802 if (shared_archive_path != NULL) {
3803 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3804 jvm_path, os::file_separator());
3805 }
3806 } else {
3807 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3808 }
3809 return shared_archive_path;
3810 }
3811
3812 #ifndef PRODUCT
3813 // Determine whether LogVMOutput should be implicitly turned on.
3814 static bool use_vm_log() {
3815 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3816 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3817 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3818 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3819 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3820 return true;
3821 }
3822
3823 #ifdef COMPILER1
3824 if (PrintC1Statistics) {
3825 return true;
3826 }
3827 #endif // COMPILER1
3828
3829 #ifdef COMPILER2
3830 if (PrintOptoAssembly || PrintOptoStatistics) {
3831 return true;
3832 }
3833 #endif // COMPILER2
3834
3835 return false;
3836 }
3837
3838 #endif // PRODUCT
3839
3840 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3841 for (int index = 0; index < args->nOptions; index++) {
3842 const JavaVMOption* option = args->options + index;
3843 const char* tail;
3844 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3845 return true;
3846 }
3847 }
3848 return false;
3849 }
3850
3851 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3852 const char* vm_options_file,
3853 const int vm_options_file_pos,
3854 ScopedVMInitArgs* vm_options_file_args,
3855 ScopedVMInitArgs* args_out) {
3856 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3857 if (code != JNI_OK) {
3858 return code;
3859 }
3860
3861 if (vm_options_file_args->get()->nOptions < 1) {
3862 return JNI_OK;
3863 }
3864
3865 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3866 jio_fprintf(defaultStream::error_stream(),
3867 "A VM options file may not refer to a VM options file. "
3868 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3869 "options file '%s' in options container '%s' is an error.\n",
3870 vm_options_file_args->vm_options_file_arg(),
3871 vm_options_file_args->container_name());
3872 return JNI_EINVAL;
3873 }
3874
3875 return args_out->insert(args, vm_options_file_args->get(),
3876 vm_options_file_pos);
3877 }
3878
3879 // Expand -XX:VMOptionsFile found in args_in as needed.
3880 // mod_args and args_out parameters may return values as needed.
3881 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3882 ScopedVMInitArgs* mod_args,
3883 JavaVMInitArgs** args_out) {
3884 jint code = match_special_option_and_act(args_in, mod_args);
3885 if (code != JNI_OK) {
3886 return code;
3887 }
3888
3889 if (mod_args->is_set()) {
3890 // args_in contains -XX:VMOptionsFile and mod_args contains the
3891 // original options from args_in along with the options expanded
3892 // from the VMOptionsFile. Return a short-hand to the caller.
3893 *args_out = mod_args->get();
3894 } else {
3895 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3896 }
3897 return JNI_OK;
3898 }
3899
3900 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3901 ScopedVMInitArgs* args_out) {
3902 // Remaining part of option string
3903 const char* tail;
3904 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3905
3906 for (int index = 0; index < args->nOptions; index++) {
3907 const JavaVMOption* option = args->options + index;
3908 if (ArgumentsExt::process_options(option)) {
3909 continue;
3910 }
3911 if (match_option(option, "-XX:Flags=", &tail)) {
3912 Arguments::set_jvm_flags_file(tail);
3913 continue;
3914 }
3915 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3916 if (vm_options_file_args.found_vm_options_file_arg()) {
3917 jio_fprintf(defaultStream::error_stream(),
3918 "The option '%s' is already specified in the options "
3919 "container '%s' so the specification of '%s' in the "
3920 "same options container is an error.\n",
3921 vm_options_file_args.vm_options_file_arg(),
3922 vm_options_file_args.container_name(),
3923 option->optionString);
3924 return JNI_EINVAL;
3925 }
3926 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3927 // If there's a VMOptionsFile, parse that
3928 jint code = insert_vm_options_file(args, tail, index,
3929 &vm_options_file_args, args_out);
3930 if (code != JNI_OK) {
3931 return code;
3932 }
3933 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3934 if (args_out->is_set()) {
3935 // The VMOptions file inserted some options so switch 'args'
3936 // to the new set of options, and continue processing which
3937 // preserves "last option wins" semantics.
3938 args = args_out->get();
3939 // The first option from the VMOptionsFile replaces the
3940 // current option. So we back track to process the
3941 // replacement option.
3942 index--;
3943 }
3944 continue;
3945 }
3946 if (match_option(option, "-XX:+PrintVMOptions")) {
3947 PrintVMOptions = true;
3948 continue;
3949 }
3950 if (match_option(option, "-XX:-PrintVMOptions")) {
3951 PrintVMOptions = false;
3952 continue;
3953 }
3954 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3955 IgnoreUnrecognizedVMOptions = true;
3956 continue;
3957 }
3958 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3959 IgnoreUnrecognizedVMOptions = false;
3960 continue;
3961 }
3962 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3963 CommandLineFlags::printFlags(tty, false);
3964 vm_exit(0);
3965 }
3966 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3967 #if INCLUDE_NMT
3968 // The launcher did not setup nmt environment variable properly.
3969 if (!MemTracker::check_launcher_nmt_support(tail)) {
3970 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3971 }
3972
3973 // Verify if nmt option is valid.
3974 if (MemTracker::verify_nmt_option()) {
3975 // Late initialization, still in single-threaded mode.
3976 if (MemTracker::tracking_level() >= NMT_summary) {
3977 MemTracker::init();
3978 }
3979 } else {
3980 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3981 }
3982 continue;
3983 #else
3984 jio_fprintf(defaultStream::error_stream(),
3985 "Native Memory Tracking is not supported in this VM\n");
3986 return JNI_ERR;
3987 #endif
3988 }
3989
3990 #ifndef PRODUCT
3991 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3992 CommandLineFlags::printFlags(tty, true);
3993 vm_exit(0);
3994 }
3995 #endif
3996
3997 if (match_option(option, "-XX:+UseAppCDS")) {
3998 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
3999 if (flag->is_diagnostic()) {
4000 flag->clear_diagnostic();
4001 }
4002 continue;
4003 }
4004 }
4005 return JNI_OK;
4006 }
4007
4008 static void print_options(const JavaVMInitArgs *args) {
4009 const char* tail;
4010 for (int index = 0; index < args->nOptions; index++) {
4011 const JavaVMOption *option = args->options + index;
4012 if (match_option(option, "-XX:", &tail)) {
4013 logOption(tail);
4014 }
4015 }
4016 }
4017
4018 bool Arguments::handle_deprecated_print_gc_flags() {
4019 if (PrintGC) {
4020 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4021 }
4022 if (PrintGCDetails) {
4023 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4024 }
4025
4026 if (_gc_log_filename != NULL) {
4027 // -Xloggc was used to specify a filename
4028 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4029
4030 LogTarget(Error, logging) target;
4031 LogStream errstream(target);
4032 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4033 } else if (PrintGC || PrintGCDetails) {
4034 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4035 }
4036 return true;
4037 }
4038
4039 void Arguments::handle_extra_cms_flags(const char* msg) {
4040 SpecialFlag flag;
4041 const char *flag_name = "UseConcMarkSweepGC";
4042 if (lookup_special_flag(flag_name, flag)) {
4043 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4044 warning("%s", msg);
4045 }
4046 }
4047
4048 // Parse entry point called from JNI_CreateJavaVM
4049
4050 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4051 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4052
4053 // Initialize ranges, constraints and writeables
4054 CommandLineFlagRangeList::init();
4055 CommandLineFlagConstraintList::init();
4056 CommandLineFlagWriteableList::init();
4057
4058 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4059 const char* hotspotrc = ".hotspotrc";
4060 bool settings_file_specified = false;
4061 bool needs_hotspotrc_warning = false;
4062 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4063 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4064
4065 // Pointers to current working set of containers
4066 JavaVMInitArgs* cur_cmd_args;
4067 JavaVMInitArgs* cur_java_options_args;
4068 JavaVMInitArgs* cur_java_tool_options_args;
4069
4070 // Containers for modified/expanded options
4071 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4072 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4073 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4074
4075
4076 jint code =
4077 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4078 if (code != JNI_OK) {
4079 return code;
4080 }
4081
4082 code = parse_java_options_environment_variable(&initial_java_options_args);
4083 if (code != JNI_OK) {
4084 return code;
4085 }
4086
4087 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4088 &mod_java_tool_options_args,
4089 &cur_java_tool_options_args);
4090 if (code != JNI_OK) {
4091 return code;
4092 }
4093
4094 code = expand_vm_options_as_needed(initial_cmd_args,
4095 &mod_cmd_args,
4096 &cur_cmd_args);
4097 if (code != JNI_OK) {
4098 return code;
4099 }
4100
4101 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4102 &mod_java_options_args,
4103 &cur_java_options_args);
4104 if (code != JNI_OK) {
4105 return code;
4106 }
4107
4108 const char* flags_file = Arguments::get_jvm_flags_file();
4109 settings_file_specified = (flags_file != NULL);
4110
4111 if (IgnoreUnrecognizedVMOptions) {
4112 cur_cmd_args->ignoreUnrecognized = true;
4113 cur_java_tool_options_args->ignoreUnrecognized = true;
4114 cur_java_options_args->ignoreUnrecognized = true;
4115 }
4116
4117 // Parse specified settings file
4118 if (settings_file_specified) {
4119 if (!process_settings_file(flags_file, true,
4120 cur_cmd_args->ignoreUnrecognized)) {
4121 return JNI_EINVAL;
4122 }
4123 } else {
4124 #ifdef ASSERT
4125 // Parse default .hotspotrc settings file
4126 if (!process_settings_file(".hotspotrc", false,
4127 cur_cmd_args->ignoreUnrecognized)) {
4128 return JNI_EINVAL;
4129 }
4130 #else
4131 struct stat buf;
4132 if (os::stat(hotspotrc, &buf) == 0) {
4133 needs_hotspotrc_warning = true;
4134 }
4135 #endif
4136 }
4137
4138 if (PrintVMOptions) {
4139 print_options(cur_java_tool_options_args);
4140 print_options(cur_cmd_args);
4141 print_options(cur_java_options_args);
4142 }
4143
4144 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4145 jint result = parse_vm_init_args(cur_java_tool_options_args,
4146 cur_java_options_args,
4147 cur_cmd_args);
4148
4149 if (result != JNI_OK) {
4150 return result;
4151 }
4152
4153 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4154 SharedArchivePath = get_shared_archive_path();
4155 if (SharedArchivePath == NULL) {
4156 return JNI_ENOMEM;
4157 }
4158
4159 // Set up VerifySharedSpaces
4160 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4161 VerifySharedSpaces = true;
4162 }
4163
4164 // Delay warning until here so that we've had a chance to process
4165 // the -XX:-PrintWarnings flag
4166 if (needs_hotspotrc_warning) {
4167 warning("%s file is present but has been ignored. "
4168 "Run with -XX:Flags=%s to load the file.",
4169 hotspotrc, hotspotrc);
4170 }
4171
4172 if (needs_module_property_warning) {
4173 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4174 " names that are reserved for internal use.");
4175 }
4176
4177 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4178 UNSUPPORTED_OPTION(UseLargePages);
4179 #endif
4180
4181 ArgumentsExt::report_unsupported_options();
4182
4183 #ifndef PRODUCT
4184 if (TraceBytecodesAt != 0) {
4185 TraceBytecodes = true;
4186 }
4187 if (CountCompiledCalls) {
4188 if (UseCounterDecay) {
4189 warning("UseCounterDecay disabled because CountCalls is set");
4190 UseCounterDecay = false;
4191 }
4192 }
4193 #endif // PRODUCT
4194
4195 if (ScavengeRootsInCode == 0) {
4196 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4197 warning("Forcing ScavengeRootsInCode non-zero");
4198 }
4199 ScavengeRootsInCode = 1;
4200 }
4201
4202 if (!handle_deprecated_print_gc_flags()) {
4203 return JNI_EINVAL;
4204 }
4205
4206 // Set object alignment values.
4207 set_object_alignment();
4208
4209 #if !INCLUDE_CDS
4210 if (DumpSharedSpaces || RequireSharedSpaces) {
4211 jio_fprintf(defaultStream::error_stream(),
4212 "Shared spaces are not supported in this VM\n");
4213 return JNI_ERR;
4214 }
4215 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4216 log_is_enabled(Info, cds)) {
4217 warning("Shared spaces are not supported in this VM");
4218 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4219 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4220 }
4221 no_shared_spaces("CDS Disabled");
4222 #endif // INCLUDE_CDS
4223
4224 return JNI_OK;
4225 }
4226
4227 jint Arguments::apply_ergo() {
4228 // Set flags based on ergonomics.
4229 jint result = set_ergonomics_flags();
4230 if (result != JNI_OK) return result;
4231
4232 #if INCLUDE_JVMCI
4233 set_jvmci_specific_flags();
4234 #endif
4235
4236 set_shared_spaces_flags();
4237
4238 // Check the GC selections again.
4239 if (!check_gc_consistency()) {
4240 return JNI_EINVAL;
4241 }
4242
4243 if (TieredCompilation) {
4244 set_tiered_flags();
4245 } else {
4246 int max_compilation_policy_choice = 1;
4247 #ifdef COMPILER2
4248 if (is_server_compilation_mode_vm()) {
4249 max_compilation_policy_choice = 2;
4250 }
4251 #endif
4252 // Check if the policy is valid.
4253 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4254 vm_exit_during_initialization(
4255 "Incompatible compilation policy selected", NULL);
4256 }
4257 // Scale CompileThreshold
4258 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4259 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4260 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4261 }
4262 }
4263
4264 #ifdef COMPILER2
4265 #ifndef PRODUCT
4266 if (PrintIdealGraphLevel > 0) {
4267 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4268 }
4269 #endif
4270 #endif
4271
4272 // Set heap size based on available physical memory
4273 set_heap_size();
4274
4275 ArgumentsExt::set_gc_specific_flags();
4276
4277 // Initialize Metaspace flags and alignments
4278 Metaspace::ergo_initialize();
4279
4280 // Set bytecode rewriting flags
4281 set_bytecode_flags();
4282
4283 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4284 jint code = set_aggressive_opts_flags();
4285 if (code != JNI_OK) {
4286 return code;
4287 }
4288
4289 // Turn off biased locking for locking debug mode flags,
4290 // which are subtly different from each other but neither works with
4291 // biased locking
4292 if (UseHeavyMonitors
4293 #ifdef COMPILER1
4294 || !UseFastLocking
4295 #endif // COMPILER1
4296 #if INCLUDE_JVMCI
4297 || !JVMCIUseFastLocking
4298 #endif
4299 ) {
4300 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4301 // flag set to true on command line; warn the user that they
4302 // can't enable biased locking here
4303 warning("Biased Locking is not supported with locking debug flags"
4304 "; ignoring UseBiasedLocking flag." );
4305 }
4306 UseBiasedLocking = false;
4307 }
4308
4309 #ifdef CC_INTERP
4310 // Clear flags not supported on zero.
4311 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4312 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4313 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4314 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4315 #endif // CC_INTERP
4316
4317 #ifdef COMPILER2
4318 if (!EliminateLocks) {
4319 EliminateNestedLocks = false;
4320 }
4321 if (!Inline) {
4322 IncrementalInline = false;
4323 }
4324 #ifndef PRODUCT
4325 if (!IncrementalInline) {
4326 AlwaysIncrementalInline = false;
4327 }
4328 #endif
4329 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4330 // nothing to use the profiling, turn if off
4331 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4332 }
4333 #endif
4334
4335 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4336 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4337 DebugNonSafepoints = true;
4338 }
4339
4340 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4341 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4342 }
4343
4344 if (UseOnStackReplacement && !UseLoopCounter) {
4345 warning("On-stack-replacement requires loop counters; enabling loop counters");
4346 FLAG_SET_DEFAULT(UseLoopCounter, true);
4347 }
4348
4349 #ifndef PRODUCT
4350 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4351 if (use_vm_log()) {
4352 LogVMOutput = true;
4353 }
4354 }
4355 #endif // PRODUCT
4356
4357 if (PrintCommandLineFlags) {
4358 CommandLineFlags::printSetFlags(tty);
4359 }
4360
4361 // Apply CPU specific policy for the BiasedLocking
4362 if (UseBiasedLocking) {
4363 if (!VM_Version::use_biased_locking() &&
4364 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4365 UseBiasedLocking = false;
4366 }
4367 }
4368 #ifdef COMPILER2
4369 if (!UseBiasedLocking || EmitSync != 0) {
4370 UseOptoBiasInlining = false;
4371 }
4372 #endif
4373
4374 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4375 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4376 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4377 } else {
4378 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4379 }
4380
4381 return JNI_OK;
4382 }
4383
4384 jint Arguments::adjust_after_os() {
4385 if (UseNUMA) {
4386 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4387 FLAG_SET_ERGO(bool, UseNUMA, false);
4388 } else if (UseParallelGC || UseParallelOldGC) {
4389 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4390 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4391 }
4392 }
4393 // UseNUMAInterleaving is set to ON for all collectors and
4394 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4395 // such as the parallel collector for Linux and Solaris will
4396 // interleave old gen and survivor spaces on top of NUMA
4397 // allocation policy for the eden space.
4398 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4399 // all platforms and ParallelGC on Windows will interleave all
4400 // of the heap spaces across NUMA nodes.
4401 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4402 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4403 }
4404 }
4405 return JNI_OK;
4406 }
4407
4408 int Arguments::PropertyList_count(SystemProperty* pl) {
4409 int count = 0;
4410 while(pl != NULL) {
4411 count++;
4412 pl = pl->next();
4413 }
4414 return count;
4415 }
4416
4417 // Return the number of readable properties.
4418 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4419 int count = 0;
4420 while(pl != NULL) {
4421 if (pl->is_readable()) {
4422 count++;
4423 }
4424 pl = pl->next();
4425 }
4426 return count;
4427 }
4428
4429 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4430 assert(key != NULL, "just checking");
4431 SystemProperty* prop;
4432 for (prop = pl; prop != NULL; prop = prop->next()) {
4433 if (strcmp(key, prop->key()) == 0) return prop->value();
4434 }
4435 return NULL;
4436 }
4437
4438 // Return the value of the requested property provided that it is a readable property.
4439 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4440 assert(key != NULL, "just checking");
4441 SystemProperty* prop;
4442 // Return the property value if the keys match and the property is not internal or
4443 // it's the special internal property "jdk.boot.class.path.append".
4444 for (prop = pl; prop != NULL; prop = prop->next()) {
4445 if (strcmp(key, prop->key()) == 0) {
4446 if (!prop->internal()) {
4447 return prop->value();
4448 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4449 return prop->value();
4450 } else {
4451 // Property is internal and not jdk.boot.class.path.append so return NULL.
4452 return NULL;
4453 }
4454 }
4455 }
4456 return NULL;
4457 }
4458
4459 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4460 int count = 0;
4461 const char* ret_val = NULL;
4462
4463 while(pl != NULL) {
4464 if(count >= index) {
4465 ret_val = pl->key();
4466 break;
4467 }
4468 count++;
4469 pl = pl->next();
4470 }
4471
4472 return ret_val;
4473 }
4474
4475 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4476 int count = 0;
4477 char* ret_val = NULL;
4478
4479 while(pl != NULL) {
4480 if(count >= index) {
4481 ret_val = pl->value();
4482 break;
4483 }
4484 count++;
4485 pl = pl->next();
4486 }
4487
4488 return ret_val;
4489 }
4490
4491 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4492 SystemProperty* p = *plist;
4493 if (p == NULL) {
4494 *plist = new_p;
4495 } else {
4496 while (p->next() != NULL) {
4497 p = p->next();
4498 }
4499 p->set_next(new_p);
4500 }
4501 }
4502
4503 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4504 bool writeable, bool internal) {
4505 if (plist == NULL)
4506 return;
4507
4508 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4509 PropertyList_add(plist, new_p);
4510 }
4511
4512 void Arguments::PropertyList_add(SystemProperty *element) {
4513 PropertyList_add(&_system_properties, element);
4514 }
4515
4516 // This add maintains unique property key in the list.
4517 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4518 PropertyAppendable append, PropertyWriteable writeable,
4519 PropertyInternal internal) {
4520 if (plist == NULL)
4521 return;
4522
4523 // If property key exist then update with new value.
4524 SystemProperty* prop;
4525 for (prop = *plist; prop != NULL; prop = prop->next()) {
4526 if (strcmp(k, prop->key()) == 0) {
4527 if (append == AppendProperty) {
4528 prop->append_value(v);
4529 } else {
4530 prop->set_value(v);
4531 }
4532 return;
4533 }
4534 }
4535
4536 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4537 }
4538
4539 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4540 // Returns true if all of the source pointed by src has been copied over to
4541 // the destination buffer pointed by buf. Otherwise, returns false.
4542 // Notes:
4543 // 1. If the length (buflen) of the destination buffer excluding the
4544 // NULL terminator character is not long enough for holding the expanded
4545 // pid characters, it also returns false instead of returning the partially
4546 // expanded one.
4547 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4548 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4549 char* buf, size_t buflen) {
4550 const char* p = src;
4551 char* b = buf;
4552 const char* src_end = &src[srclen];
4553 char* buf_end = &buf[buflen - 1];
4554
4555 while (p < src_end && b < buf_end) {
4556 if (*p == '%') {
4557 switch (*(++p)) {
4558 case '%': // "%%" ==> "%"
4559 *b++ = *p++;
4560 break;
4561 case 'p': { // "%p" ==> current process id
4562 // buf_end points to the character before the last character so
4563 // that we could write '\0' to the end of the buffer.
4564 size_t buf_sz = buf_end - b + 1;
4565 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4566
4567 // if jio_snprintf fails or the buffer is not long enough to hold
4568 // the expanded pid, returns false.
4569 if (ret < 0 || ret >= (int)buf_sz) {
4570 return false;
4571 } else {
4572 b += ret;
4573 assert(*b == '\0', "fail in copy_expand_pid");
4574 if (p == src_end && b == buf_end + 1) {
4575 // reach the end of the buffer.
4576 return true;
4577 }
4578 }
4579 p++;
4580 break;
4581 }
4582 default :
4583 *b++ = '%';
4584 }
4585 } else {
4586 *b++ = *p++;
4587 }
4588 }
4589 *b = '\0';
4590 return (p == src_end); // return false if not all of the source was copied
4591 }