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/gcConfig.hpp"
34 #include "gc/shared/genCollectedHeap.hpp"
35 #include "gc/shared/referenceProcessor.hpp"
36 #include "gc/shared/taskqueue.hpp"
37 #include "logging/log.hpp"
38 #include "logging/logConfiguration.hpp"
39 #include "logging/logStream.hpp"
40 #include "logging/logTag.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "prims/jvmtiExport.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/arguments_ext.hpp"
47 #include "runtime/commandLineFlagConstraintList.hpp"
48 #include "runtime/commandLineFlagWriteableList.hpp"
49 #include "runtime/commandLineFlagRangeList.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/globals_extension.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/os.inline.hpp"
54 #include "runtime/safepoint.hpp"
55 #include "runtime/safepointMechanism.hpp"
56 #include "runtime/vm_version.hpp"
57 #include "services/management.hpp"
58 #include "services/memTracker.hpp"
59 #include "utilities/align.hpp"
60 #include "utilities/defaultStream.hpp"
61 #include "utilities/macros.hpp"
62 #include "utilities/stringUtils.hpp"
63 #if INCLUDE_JVMCI
64 #include "jvmci/jvmciRuntime.hpp"
65 #endif
66
67 // Note: This is a special bug reporting site for the JVM
68 #ifdef VENDOR_URL_VM_BUG
69 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
70 #else
71 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
72 #endif
73 #define DEFAULT_JAVA_LAUNCHER "generic"
74
75 char* Arguments::_jvm_flags_file = NULL;
76 char** Arguments::_jvm_flags_array = NULL;
77 int Arguments::_num_jvm_flags = 0;
78 char** Arguments::_jvm_args_array = NULL;
79 int Arguments::_num_jvm_args = 0;
80 char* Arguments::_java_command = NULL;
81 SystemProperty* Arguments::_system_properties = NULL;
82 const char* Arguments::_gc_log_filename = NULL;
83 size_t Arguments::_conservative_max_heap_alignment = 0;
84 size_t Arguments::_min_heap_size = 0;
85 Arguments::Mode Arguments::_mode = _mixed;
86 bool Arguments::_java_compiler = false;
87 bool Arguments::_xdebug_mode = false;
88 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
89 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
90 int Arguments::_sun_java_launcher_pid = -1;
91 bool Arguments::_sun_java_launcher_is_altjvm = false;
92
93 // These parameters are reset in method parse_vm_init_args()
94 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
95 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
96 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
97 bool Arguments::_ClipInlining = ClipInlining;
98 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
99 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
100
101 bool Arguments::_enable_preview = false;
102
103 char* Arguments::SharedArchivePath = NULL;
104
105 AgentLibraryList Arguments::_libraryList;
106 AgentLibraryList Arguments::_agentList;
107
108 abort_hook_t Arguments::_abort_hook = NULL;
109 exit_hook_t Arguments::_exit_hook = NULL;
110 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
111
112
113 SystemProperty *Arguments::_sun_boot_library_path = NULL;
114 SystemProperty *Arguments::_java_library_path = NULL;
115 SystemProperty *Arguments::_java_home = NULL;
116 SystemProperty *Arguments::_java_class_path = NULL;
117 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
118
119 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
120 PathString *Arguments::_system_boot_class_path = NULL;
121 bool Arguments::_has_jimage = false;
122
123 char* Arguments::_ext_dirs = NULL;
124
125 bool PathString::set_value(const char *value) {
126 if (_value != NULL) {
127 FreeHeap(_value);
128 }
129 _value = AllocateHeap(strlen(value)+1, mtArguments);
130 assert(_value != NULL, "Unable to allocate space for new path value");
131 if (_value != NULL) {
132 strcpy(_value, value);
133 } else {
134 // not able to allocate
135 return false;
136 }
137 return true;
138 }
139
140 void PathString::append_value(const char *value) {
141 char *sp;
142 size_t len = 0;
143 if (value != NULL) {
144 len = strlen(value);
145 if (_value != NULL) {
146 len += strlen(_value);
147 }
148 sp = AllocateHeap(len+2, mtArguments);
149 assert(sp != NULL, "Unable to allocate space for new append path value");
150 if (sp != NULL) {
151 if (_value != NULL) {
152 strcpy(sp, _value);
153 strcat(sp, os::path_separator());
154 strcat(sp, value);
155 FreeHeap(_value);
156 } else {
157 strcpy(sp, value);
158 }
159 _value = sp;
160 }
161 }
162 }
163
164 PathString::PathString(const char* value) {
165 if (value == NULL) {
166 _value = NULL;
167 } else {
168 _value = AllocateHeap(strlen(value)+1, mtArguments);
169 strcpy(_value, value);
170 }
171 }
172
173 PathString::~PathString() {
174 if (_value != NULL) {
175 FreeHeap(_value);
176 _value = NULL;
177 }
178 }
179
180 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
181 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
182 size_t len = strlen(module_name) + 1;
183 _module_name = AllocateHeap(len, mtInternal);
184 strncpy(_module_name, module_name, len); // copy the trailing null
185 _path = new PathString(path);
186 }
187
188 ModulePatchPath::~ModulePatchPath() {
189 if (_module_name != NULL) {
190 FreeHeap(_module_name);
191 _module_name = NULL;
192 }
193 if (_path != NULL) {
194 delete _path;
195 _path = NULL;
196 }
197 }
198
199 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
200 if (key == NULL) {
201 _key = NULL;
202 } else {
203 _key = AllocateHeap(strlen(key)+1, mtArguments);
204 strcpy(_key, key);
205 }
206 _next = NULL;
207 _internal = internal;
208 _writeable = writeable;
209 }
210
211 AgentLibrary::AgentLibrary(const char* name, const char* options,
212 bool is_absolute_path, void* os_lib,
213 bool instrument_lib) {
214 _name = AllocateHeap(strlen(name)+1, mtArguments);
215 strcpy(_name, name);
216 if (options == NULL) {
217 _options = NULL;
218 } else {
219 _options = AllocateHeap(strlen(options)+1, mtArguments);
220 strcpy(_options, options);
221 }
222 _is_absolute_path = is_absolute_path;
223 _os_lib = os_lib;
224 _next = NULL;
225 _state = agent_invalid;
226 _is_static_lib = false;
227 _is_instrument_lib = instrument_lib;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = NULL;
246 bool result = match_option(option, name, &tail);
247 if (tail != NULL && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != NULL; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 static void logOption(const char* opt) {
270 if (PrintVMOptions) {
271 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
272 }
273 }
274
275 bool needs_module_property_warning = false;
276
277 #define MODULE_PROPERTY_PREFIX "jdk.module."
278 #define MODULE_PROPERTY_PREFIX_LEN 11
279 #define ADDEXPORTS "addexports"
280 #define ADDEXPORTS_LEN 10
281 #define ADDREADS "addreads"
282 #define ADDREADS_LEN 8
283 #define ADDOPENS "addopens"
284 #define ADDOPENS_LEN 8
285 #define PATCH "patch"
286 #define PATCH_LEN 5
287 #define ADDMODS "addmods"
288 #define ADDMODS_LEN 7
289 #define LIMITMODS "limitmods"
290 #define LIMITMODS_LEN 9
291 #define PATH "path"
292 #define PATH_LEN 4
293 #define UPGRADE_PATH "upgrade.path"
294 #define UPGRADE_PATH_LEN 12
295
296 void Arguments::add_init_library(const char* name, char* options) {
297 _libraryList.add(new AgentLibrary(name, options, false, NULL));
298 }
299
300 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
301 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
302 }
303
304 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
305 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
306 }
307
308 // Late-binding agents not started via arguments
309 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
310 _agentList.add(agentLib);
311 }
312
313 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
314 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
315 }
316
317 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
318 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
319 return ((strncmp(option, property, len) == 0) &&
320 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
321 }
322
323 // Return true if property starts with "jdk.module." and its ensuing chars match
324 // any of the reserved module properties.
325 // property should be passed without the leading "-D".
326 bool Arguments::is_internal_module_property(const char* property) {
327 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
328 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
329 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
330 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
331 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
332 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
333 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
334 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
335 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
336 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
337 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
338 return true;
339 }
340 }
341 return false;
342 }
343
344 // Process java launcher properties.
345 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
346 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
347 // sun.java.launcher.pid is defined.
348 // Must do this before setting up other system properties,
349 // as some of them may depend on launcher type.
350 for (int index = 0; index < args->nOptions; index++) {
351 const JavaVMOption* option = args->options + index;
352 const char* tail;
353
354 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
355 process_java_launcher_argument(tail, option->extraInfo);
356 continue;
357 }
358 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
359 if (strcmp(tail, "true") == 0) {
360 _sun_java_launcher_is_altjvm = true;
361 }
362 continue;
363 }
364 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
365 _sun_java_launcher_pid = atoi(tail);
366 continue;
367 }
368 }
369 }
370
371 // Initialize system properties key and value.
372 void Arguments::init_system_properties() {
373
374 // Set up _system_boot_class_path which is not a property but
375 // relies heavily on argument processing and the jdk.boot.class.path.append
376 // property. It is used to store the underlying system boot class path.
377 _system_boot_class_path = new PathString(NULL);
378
379 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
380 "Java Virtual Machine Specification", false));
381 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
382 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
383 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
384 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
385
386 // Following are JVMTI agent writable properties.
387 // Properties values are set to NULL and they are
388 // os specific they are initialized in os::init_system_properties_values().
389 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
390 _java_library_path = new SystemProperty("java.library.path", NULL, true);
391 _java_home = new SystemProperty("java.home", NULL, true);
392 _java_class_path = new SystemProperty("java.class.path", "", true);
393 // jdk.boot.class.path.append is a non-writeable, internal property.
394 // It can only be set by either:
395 // - -Xbootclasspath/a:
396 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
397 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
398
399 // Add to System Property list.
400 PropertyList_add(&_system_properties, _sun_boot_library_path);
401 PropertyList_add(&_system_properties, _java_library_path);
402 PropertyList_add(&_system_properties, _java_home);
403 PropertyList_add(&_system_properties, _java_class_path);
404 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
405
406 // Set OS specific system properties values
407 os::init_system_properties_values();
408 }
409
410 // Update/Initialize System properties after JDK version number is known
411 void Arguments::init_version_specific_system_properties() {
412 enum { bufsz = 16 };
413 char buffer[bufsz];
414 const char* spec_vendor = "Oracle Corporation";
415 uint32_t spec_version = JDK_Version::current().major_version();
416
417 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
418
419 PropertyList_add(&_system_properties,
420 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
421 PropertyList_add(&_system_properties,
422 new SystemProperty("java.vm.specification.version", buffer, false));
423 PropertyList_add(&_system_properties,
424 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
425 }
426
427 /*
428 * -XX argument processing:
429 *
430 * -XX arguments are defined in several places, such as:
431 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
432 * -XX arguments are parsed in parse_argument().
433 * -XX argument bounds checking is done in check_vm_args_consistency().
434 *
435 * Over time -XX arguments may change. There are mechanisms to handle common cases:
436 *
437 * ALIASED: An option that is simply another name for another option. This is often
438 * part of the process of deprecating a flag, but not all aliases need
439 * to be deprecated.
440 *
441 * Create an alias for an option by adding the old and new option names to the
442 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
443 *
444 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
445 * support may be removed in the future. Both regular and aliased options may be
446 * deprecated.
447 *
448 * Add a deprecation warning for an option (or alias) by adding an entry in the
449 * "special_jvm_flags" table and setting the "deprecated_in" field.
450 * Often an option "deprecated" in one major release will
451 * be made "obsolete" in the next. In this case the entry should also have its
452 * "obsolete_in" field set.
453 *
454 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
455 * on the command line. A warning is printed to let the user know that option might not
456 * be accepted in the future.
457 *
458 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
459 * table and setting the "obsolete_in" field.
460 *
461 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
462 * to the current JDK version. The system will flatly refuse to admit the existence of
463 * the flag. This allows a flag to die automatically over JDK releases.
464 *
465 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
466 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
467 * - Newly obsolete or expired deprecated options should have their global variable
468 * definitions removed (from globals.hpp, etc) and related implementations removed.
469 *
470 * Recommended approach for removing options:
471 *
472 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
473 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
474 *
475 * To remove internal options (e.g. diagnostic, experimental, develop options), use
476 * a 2-step model adding major release numbers to the obsolete and expire columns.
477 *
478 * To change the name of an option, use the alias table as well as a 2-step
479 * model adding major release numbers to the deprecate and expire columns.
480 * Think twice about aliasing commonly used customer options.
481 *
482 * There are times when it is appropriate to leave a future release number as undefined.
483 *
484 * Tests: Aliases should be tested in VMAliasOptions.java.
485 * Deprecated options should be tested in VMDeprecatedOptions.java.
486 */
487
488 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
489 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
490 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
491 // the command-line as usual, but will issue a warning.
492 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
493 // the command-line, while issuing a warning and ignoring the flag value.
494 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
495 // existence of the flag.
496 //
497 // MANUAL CLEANUP ON JDK VERSION UPDATES:
498 // This table ensures that the handling of options will update automatically when the JDK
499 // version is incremented, but the source code needs to be cleanup up manually:
500 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
501 // variable should be removed, as well as users of the variable.
502 // - As "deprecated" options age into "obsolete" options, move the entry into the
503 // "Obsolete Flags" section of the table.
504 // - All expired options should be removed from the table.
505 static SpecialFlag const special_jvm_flags[] = {
506 // -------------- Deprecated Flags --------------
507 // --- Non-alias flags - sorted by obsolete_in then expired_in:
508 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
509 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
511 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
512 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
515 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
516 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
517 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
518 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
519 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
520 { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
521 { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
522 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
523
524 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
525 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
528 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
529
530 // -------------- Obsolete Flags - sorted by expired_in --------------
531 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
532 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
533 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
534 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
535 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
536 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
537 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
538 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
539 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
540 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
541 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
542 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
543 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
544 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
545 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
546 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
547 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
548 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
549 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
550
551 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
552 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
553 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
554 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
555 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
556 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
557 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
558 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
559 #endif
560
561 { NULL, JDK_Version(0), JDK_Version(0) }
562 };
563
564 // Flags that are aliases for other flags.
565 typedef struct {
566 const char* alias_name;
567 const char* real_name;
568 } AliasedFlag;
569
570 static AliasedFlag const aliased_jvm_flags[] = {
571 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
572 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
573 { NULL, NULL}
574 };
575
576 // NOTE: A compatibility request will be necessary for each alias to be removed.
577 static AliasedLoggingFlag const aliased_logging_flags[] = {
578 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
579 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
580 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
581 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
582 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
583 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
584 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
585 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
586 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
587 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
588 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
589 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
590 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
591 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
592 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
593 };
594
595 #ifndef PRODUCT
596 // These options are removed in jdk9. Remove this code for jdk10.
597 static AliasedFlag const removed_develop_logging_flags[] = {
598 { "TraceClassInitialization", "-Xlog:class+init" },
599 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
600 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
601 { "TraceItables", "-Xlog:itables=debug" },
602 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
603 { "TraceSafepoint", "-Xlog:safepoint=debug" },
604 { "TraceStartupTime", "-Xlog:startuptime" },
605 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
606 { "PrintVtables", "-Xlog:vtables=debug" },
607 { "VerboseVerification", "-Xlog:verification" },
608 { NULL, NULL }
609 };
610 #endif //PRODUCT
611
612 // Return true if "v" is less than "other", where "other" may be "undefined".
613 static bool version_less_than(JDK_Version v, JDK_Version other) {
614 assert(!v.is_undefined(), "must be defined");
615 if (!other.is_undefined() && v.compare(other) >= 0) {
616 return false;
617 } else {
618 return true;
619 }
620 }
621
622 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
623
624 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
625 // Allow extensions to have priority
626 if (lookup_special_flag_ext(flag_name, flag)) {
627 return true;
628 }
629
630 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
631 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
632 flag = special_jvm_flags[i];
633 return true;
634 }
635 }
636 return false;
637 }
638
639 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
640 assert(version != NULL, "Must provide a version buffer");
641 SpecialFlag flag;
642 if (lookup_special_flag(flag_name, flag)) {
643 if (!flag.obsolete_in.is_undefined()) {
644 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
645 *version = flag.obsolete_in;
646 return true;
647 }
648 }
649 }
650 return false;
651 }
652
653 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
654 assert(version != NULL, "Must provide a version buffer");
655 SpecialFlag flag;
656 if (lookup_special_flag(flag_name, flag)) {
657 if (!flag.deprecated_in.is_undefined()) {
658 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
659 version_less_than(JDK_Version::current(), flag.expired_in)) {
660 *version = flag.deprecated_in;
661 return 1;
662 } else {
663 return -1;
664 }
665 }
666 }
667 return 0;
668 }
669
670 #ifndef PRODUCT
671 const char* Arguments::removed_develop_logging_flag_name(const char* name){
672 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
673 const AliasedFlag& flag = removed_develop_logging_flags[i];
674 if (strcmp(flag.alias_name, name) == 0) {
675 return flag.real_name;
676 }
677 }
678 return NULL;
679 }
680 #endif // PRODUCT
681
682 const char* Arguments::real_flag_name(const char *flag_name) {
683 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
684 const AliasedFlag& flag_status = aliased_jvm_flags[i];
685 if (strcmp(flag_status.alias_name, flag_name) == 0) {
686 return flag_status.real_name;
687 }
688 }
689 return flag_name;
690 }
691
692 #ifdef ASSERT
693 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
694 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
695 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
696 return true;
697 }
698 }
699 return false;
700 }
701
702 // Verifies the correctness of the entries in the special_jvm_flags table.
703 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
704 // version being earlier than the deprecation version, then a warning is issued
705 // and verification fails - by returning false. If it is detected that the table
706 // is out of date, with respect to the current version, then a warning is issued
707 // but verification does not fail. This allows the VM to operate when the version
708 // is first updated, without needing to update all the impacted flags at the
709 // same time.
710 static bool verify_special_jvm_flags() {
711 bool success = true;
712 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
713 const SpecialFlag& flag = special_jvm_flags[i];
714 if (lookup_special_flag(flag.name, i)) {
715 warning("Duplicate special flag declaration \"%s\"", flag.name);
716 success = false;
717 }
718 if (flag.deprecated_in.is_undefined() &&
719 flag.obsolete_in.is_undefined()) {
720 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
721 success = false;
722 }
723
724 if (!flag.deprecated_in.is_undefined()) {
725 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
726 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
727 success = false;
728 }
729
730 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
731 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
732 success = false;
733 }
734 }
735
736 if (!flag.obsolete_in.is_undefined()) {
737 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
738 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
739 success = false;
740 }
741
742 // if flag has become obsolete it should not have a "globals" flag defined anymore.
743 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
744 if (Flag::find_flag(flag.name) != NULL) {
745 // Temporarily disable the warning: 8196739
746 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
747 }
748 }
749 }
750
751 if (!flag.expired_in.is_undefined()) {
752 // if flag has become expired it should not have a "globals" flag defined anymore.
753 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
754 if (Flag::find_flag(flag.name) != NULL) {
755 // Temporarily disable the warning: 8196739
756 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
757 }
758 }
759 }
760
761 }
762 return success;
763 }
764 #endif
765
766 // Parses a size specification string.
767 bool Arguments::atojulong(const char *s, julong* result) {
768 julong n = 0;
769
770 // First char must be a digit. Don't allow negative numbers or leading spaces.
771 if (!isdigit(*s)) {
772 return false;
773 }
774
775 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
776 char* remainder;
777 errno = 0;
778 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
779 if (errno != 0) {
780 return false;
781 }
782
783 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
784 if (remainder == s || strlen(remainder) > 1) {
785 return false;
786 }
787
788 switch (*remainder) {
789 case 'T': case 't':
790 *result = n * G * K;
791 // Check for overflow.
792 if (*result/((julong)G * K) != n) return false;
793 return true;
794 case 'G': case 'g':
795 *result = n * G;
796 if (*result/G != n) return false;
797 return true;
798 case 'M': case 'm':
799 *result = n * M;
800 if (*result/M != n) return false;
801 return true;
802 case 'K': case 'k':
803 *result = n * K;
804 if (*result/K != n) return false;
805 return true;
806 case '\0':
807 *result = n;
808 return true;
809 default:
810 return false;
811 }
812 }
813
814 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
815 if (size < min_size) return arg_too_small;
816 if (size > max_size) return arg_too_big;
817 return arg_in_range;
818 }
819
820 // Describe an argument out of range error
821 void Arguments::describe_range_error(ArgsRange errcode) {
822 switch(errcode) {
823 case arg_too_big:
824 jio_fprintf(defaultStream::error_stream(),
825 "The specified size exceeds the maximum "
826 "representable size.\n");
827 break;
828 case arg_too_small:
829 case arg_unreadable:
830 case arg_in_range:
831 // do nothing for now
832 break;
833 default:
834 ShouldNotReachHere();
835 }
836 }
837
838 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
839 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
840 return true;
841 } else {
842 return false;
843 }
844 }
845
846 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
847 char* end;
848 errno = 0;
849 double v = strtod(value, &end);
850 if ((errno != 0) || (*end != 0)) {
851 return false;
852 }
853
854 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
855 return true;
856 }
857 return false;
858 }
859
860 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
861 julong v;
862 int int_v;
863 intx intx_v;
864 bool is_neg = false;
865 Flag* result = Flag::find_flag(name, strlen(name));
866
867 if (result == NULL) {
868 return false;
869 }
870
871 // Check the sign first since atojulong() parses only unsigned values.
872 if (*value == '-') {
873 if (!result->is_intx() && !result->is_int()) {
874 return false;
875 }
876 value++;
877 is_neg = true;
878 }
879 if (!Arguments::atojulong(value, &v)) {
880 return false;
881 }
882 if (result->is_int()) {
883 int_v = (int) v;
884 if (is_neg) {
885 int_v = -int_v;
886 }
887 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
888 } else if (result->is_uint()) {
889 uint uint_v = (uint) v;
890 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
891 } else if (result->is_intx()) {
892 intx_v = (intx) v;
893 if (is_neg) {
894 intx_v = -intx_v;
895 }
896 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
897 } else if (result->is_uintx()) {
898 uintx uintx_v = (uintx) v;
899 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
900 } else if (result->is_uint64_t()) {
901 uint64_t uint64_t_v = (uint64_t) v;
902 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
903 } else if (result->is_size_t()) {
904 size_t size_t_v = (size_t) v;
905 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
906 } else if (result->is_double()) {
907 double double_v = (double) v;
908 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
909 } else {
910 return false;
911 }
912 }
913
914 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
915 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
916 // Contract: CommandLineFlags always returns a pointer that needs freeing.
917 FREE_C_HEAP_ARRAY(char, value);
918 return true;
919 }
920
921 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
922 const char* old_value = "";
923 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
924 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
925 size_t new_len = strlen(new_value);
926 const char* value;
927 char* free_this_too = NULL;
928 if (old_len == 0) {
929 value = new_value;
930 } else if (new_len == 0) {
931 value = old_value;
932 } else {
933 size_t length = old_len + 1 + new_len + 1;
934 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
935 // each new setting adds another LINE to the switch:
936 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
937 value = buf;
938 free_this_too = buf;
939 }
940 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
941 // CommandLineFlags always returns a pointer that needs freeing.
942 FREE_C_HEAP_ARRAY(char, value);
943 if (free_this_too != NULL) {
944 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
945 FREE_C_HEAP_ARRAY(char, free_this_too);
946 }
947 return true;
948 }
949
950 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
951 const char* real_name = real_flag_name(arg);
952 JDK_Version since = JDK_Version();
953 switch (is_deprecated_flag(arg, &since)) {
954 case -1:
955 return NULL; // obsolete or expired, don't process normally
956 case 0:
957 return real_name;
958 case 1: {
959 if (warn) {
960 char version[256];
961 since.to_string(version, sizeof(version));
962 if (real_name != arg) {
963 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
964 arg, version, real_name);
965 } else {
966 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
967 arg, version);
968 }
969 }
970 return real_name;
971 }
972 }
973 ShouldNotReachHere();
974 return NULL;
975 }
976
977 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
978 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
979 // Set tagset string buffer at max size of 256, large enough for any alias tagset
980 const int max_tagset_size = 256;
981 int max_tagset_len = max_tagset_size - 1;
982 char tagset_buffer[max_tagset_size];
983 tagset_buffer[0] = '\0';
984
985 // Write tag-set for aliased logging option, in string list form
986 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
987 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
988 if (i > 0) {
989 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
990 }
991 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
992 }
993 if (!alf.exactMatch) {
994 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
995 }
996 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
997 (on) ? "+" : "-",
998 name,
999 tagset_buffer,
1000 (on) ? LogLevel::name(alf.level) : "off");
1001 }
1002
1003 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1004 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1005 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1006 if (strcmp(alf.alias_name, name) == 0) {
1007 log_deprecated_flag(name, on, alf);
1008 return alf;
1009 }
1010 }
1011 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1012 return a;
1013 }
1014
1015 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1016
1017 // range of acceptable characters spelled out for portability reasons
1018 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1019 #define BUFLEN 255
1020 char name[BUFLEN+1];
1021 char dummy;
1022 const char* real_name;
1023 bool warn_if_deprecated = true;
1024
1025 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1026 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1027 if (alf.alias_name != NULL){
1028 LogConfiguration::configure_stdout(LogLevel::Off, 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, false, origin);
1036 }
1037 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1038 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1039 if (alf.alias_name != NULL){
1040 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1041 return true;
1042 }
1043 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1044 if (real_name == NULL) {
1045 return false;
1046 }
1047 return set_bool_flag(real_name, true, origin);
1048 }
1049
1050 char punct;
1051 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1052 const char* value = strchr(arg, '=') + 1;
1053 Flag* flag;
1054
1055 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1056 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1057 if (alf.alias_name != NULL) {
1058 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1059 return true;
1060 }
1061 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1062 if (real_name == NULL) {
1063 return false;
1064 }
1065 flag = Flag::find_flag(real_name);
1066 if (flag != NULL && flag->is_ccstr()) {
1067 if (flag->ccstr_accumulates()) {
1068 return append_to_string_flag(real_name, value, origin);
1069 } else {
1070 if (value[0] == '\0') {
1071 value = NULL;
1072 }
1073 return set_string_flag(real_name, value, origin);
1074 }
1075 } else {
1076 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1077 }
1078 }
1079
1080 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1081 const char* value = strchr(arg, '=') + 1;
1082 // -XX:Foo:=xxx will reset the string flag to the given value.
1083 if (value[0] == '\0') {
1084 value = NULL;
1085 }
1086 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1087 if (real_name == NULL) {
1088 return false;
1089 }
1090 return set_string_flag(real_name, value, origin);
1091 }
1092
1093 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1094 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1095 #define NUMBER_RANGE "[0123456789eE+-]"
1096 char value[BUFLEN + 1];
1097 char value2[BUFLEN + 1];
1098 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1099 // Looks like a floating-point number -- try again with more lenient format string
1100 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1101 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1102 if (real_name == NULL) {
1103 return false;
1104 }
1105 return set_fp_numeric_flag(real_name, value, origin);
1106 }
1107 }
1108
1109 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1110 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1111 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1112 if (real_name == NULL) {
1113 return false;
1114 }
1115 return set_numeric_flag(real_name, value, origin);
1116 }
1117
1118 return false;
1119 }
1120
1121 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1122 assert(bldarray != NULL, "illegal argument");
1123
1124 if (arg == NULL) {
1125 return;
1126 }
1127
1128 int new_count = *count + 1;
1129
1130 // expand the array and add arg to the last element
1131 if (*bldarray == NULL) {
1132 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1133 } else {
1134 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1135 }
1136 (*bldarray)[*count] = os::strdup_check_oom(arg);
1137 *count = new_count;
1138 }
1139
1140 void Arguments::build_jvm_args(const char* arg) {
1141 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1142 }
1143
1144 void Arguments::build_jvm_flags(const char* arg) {
1145 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1146 }
1147
1148 // utility function to return a string that concatenates all
1149 // strings in a given char** array
1150 const char* Arguments::build_resource_string(char** args, int count) {
1151 if (args == NULL || count == 0) {
1152 return NULL;
1153 }
1154 size_t length = 0;
1155 for (int i = 0; i < count; i++) {
1156 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1157 }
1158 char* s = NEW_RESOURCE_ARRAY(char, length);
1159 char* dst = s;
1160 for (int j = 0; j < count; j++) {
1161 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1162 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1163 dst += offset;
1164 length -= offset;
1165 }
1166 return (const char*) s;
1167 }
1168
1169 void Arguments::print_on(outputStream* st) {
1170 st->print_cr("VM Arguments:");
1171 if (num_jvm_flags() > 0) {
1172 st->print("jvm_flags: "); print_jvm_flags_on(st);
1173 st->cr();
1174 }
1175 if (num_jvm_args() > 0) {
1176 st->print("jvm_args: "); print_jvm_args_on(st);
1177 st->cr();
1178 }
1179 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1180 if (_java_class_path != NULL) {
1181 char* path = _java_class_path->value();
1182 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1183 }
1184 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1185 }
1186
1187 void Arguments::print_summary_on(outputStream* st) {
1188 // Print the command line. Environment variables that are helpful for
1189 // reproducing the problem are written later in the hs_err file.
1190 // flags are from setting file
1191 if (num_jvm_flags() > 0) {
1192 st->print_raw("Settings File: ");
1193 print_jvm_flags_on(st);
1194 st->cr();
1195 }
1196 // args are the command line and environment variable arguments.
1197 st->print_raw("Command Line: ");
1198 if (num_jvm_args() > 0) {
1199 print_jvm_args_on(st);
1200 }
1201 // this is the classfile and any arguments to the java program
1202 if (java_command() != NULL) {
1203 st->print("%s", java_command());
1204 }
1205 st->cr();
1206 }
1207
1208 void Arguments::print_jvm_flags_on(outputStream* st) {
1209 if (_num_jvm_flags > 0) {
1210 for (int i=0; i < _num_jvm_flags; i++) {
1211 st->print("%s ", _jvm_flags_array[i]);
1212 }
1213 }
1214 }
1215
1216 void Arguments::print_jvm_args_on(outputStream* st) {
1217 if (_num_jvm_args > 0) {
1218 for (int i=0; i < _num_jvm_args; i++) {
1219 st->print("%s ", _jvm_args_array[i]);
1220 }
1221 }
1222 }
1223
1224 bool Arguments::process_argument(const char* arg,
1225 jboolean ignore_unrecognized,
1226 Flag::Flags origin) {
1227 JDK_Version since = JDK_Version();
1228
1229 if (parse_argument(arg, origin)) {
1230 return true;
1231 }
1232
1233 // Determine if the flag has '+', '-', or '=' characters.
1234 bool has_plus_minus = (*arg == '+' || *arg == '-');
1235 const char* const argname = has_plus_minus ? arg + 1 : arg;
1236
1237 size_t arg_len;
1238 const char* equal_sign = strchr(argname, '=');
1239 if (equal_sign == NULL) {
1240 arg_len = strlen(argname);
1241 } else {
1242 arg_len = equal_sign - argname;
1243 }
1244
1245 // Only make the obsolete check for valid arguments.
1246 if (arg_len <= BUFLEN) {
1247 // Construct a string which consists only of the argument name without '+', '-', or '='.
1248 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1249 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1250 if (is_obsolete_flag(stripped_argname, &since)) {
1251 char version[256];
1252 since.to_string(version, sizeof(version));
1253 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1254 return true;
1255 }
1256 #ifndef PRODUCT
1257 else {
1258 const char* replacement;
1259 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1260 log_warning(arguments)("%s has been removed. Please use %s instead.",
1261 stripped_argname,
1262 replacement);
1263 return false;
1264 }
1265 }
1266 #endif //PRODUCT
1267 }
1268
1269 // For locked flags, report a custom error message if available.
1270 // Otherwise, report the standard unrecognized VM option.
1271 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1272 if (found_flag != NULL) {
1273 char locked_message_buf[BUFLEN];
1274 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1275 if (strlen(locked_message_buf) == 0) {
1276 if (found_flag->is_bool() && !has_plus_minus) {
1277 jio_fprintf(defaultStream::error_stream(),
1278 "Missing +/- setting for VM option '%s'\n", argname);
1279 } else if (!found_flag->is_bool() && has_plus_minus) {
1280 jio_fprintf(defaultStream::error_stream(),
1281 "Unexpected +/- setting in VM option '%s'\n", argname);
1282 } else {
1283 jio_fprintf(defaultStream::error_stream(),
1284 "Improperly specified VM option '%s'\n", argname);
1285 }
1286 } else {
1287 #ifdef PRODUCT
1288 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1289 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1290 if (ignore_unrecognized && mismatched) {
1291 return true;
1292 }
1293 #endif
1294 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1295 }
1296 } else {
1297 if (ignore_unrecognized) {
1298 return true;
1299 }
1300 jio_fprintf(defaultStream::error_stream(),
1301 "Unrecognized VM option '%s'\n", argname);
1302 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1303 if (fuzzy_matched != NULL) {
1304 jio_fprintf(defaultStream::error_stream(),
1305 "Did you mean '%s%s%s'? ",
1306 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1307 fuzzy_matched->_name,
1308 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1309 }
1310 }
1311
1312 // allow for commandline "commenting out" options like -XX:#+Verbose
1313 return arg[0] == '#';
1314 }
1315
1316 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1317 FILE* stream = fopen(file_name, "rb");
1318 if (stream == NULL) {
1319 if (should_exist) {
1320 jio_fprintf(defaultStream::error_stream(),
1321 "Could not open settings file %s\n", file_name);
1322 return false;
1323 } else {
1324 return true;
1325 }
1326 }
1327
1328 char token[1024];
1329 int pos = 0;
1330
1331 bool in_white_space = true;
1332 bool in_comment = false;
1333 bool in_quote = false;
1334 char quote_c = 0;
1335 bool result = true;
1336
1337 int c = getc(stream);
1338 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1339 if (in_white_space) {
1340 if (in_comment) {
1341 if (c == '\n') in_comment = false;
1342 } else {
1343 if (c == '#') in_comment = true;
1344 else if (!isspace(c)) {
1345 in_white_space = false;
1346 token[pos++] = c;
1347 }
1348 }
1349 } else {
1350 if (c == '\n' || (!in_quote && isspace(c))) {
1351 // token ends at newline, or at unquoted whitespace
1352 // this allows a way to include spaces in string-valued options
1353 token[pos] = '\0';
1354 logOption(token);
1355 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1356 build_jvm_flags(token);
1357 pos = 0;
1358 in_white_space = true;
1359 in_quote = false;
1360 } else if (!in_quote && (c == '\'' || c == '"')) {
1361 in_quote = true;
1362 quote_c = c;
1363 } else if (in_quote && (c == quote_c)) {
1364 in_quote = false;
1365 } else {
1366 token[pos++] = c;
1367 }
1368 }
1369 c = getc(stream);
1370 }
1371 if (pos > 0) {
1372 token[pos] = '\0';
1373 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1374 build_jvm_flags(token);
1375 }
1376 fclose(stream);
1377 return result;
1378 }
1379
1380 //=============================================================================================================
1381 // Parsing of properties (-D)
1382
1383 const char* Arguments::get_property(const char* key) {
1384 return PropertyList_get_value(system_properties(), key);
1385 }
1386
1387 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1388 const char* eq = strchr(prop, '=');
1389 const char* key;
1390 const char* value = "";
1391
1392 if (eq == NULL) {
1393 // property doesn't have a value, thus use passed string
1394 key = prop;
1395 } else {
1396 // property have a value, thus extract it and save to the
1397 // allocated string
1398 size_t key_len = eq - prop;
1399 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1400
1401 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1402 key = tmp_key;
1403
1404 value = &prop[key_len + 1];
1405 }
1406
1407 if (strcmp(key, "java.compiler") == 0) {
1408 process_java_compiler_argument(value);
1409 // Record value in Arguments, but let it get passed to Java.
1410 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1411 strcmp(key, "sun.java.launcher.pid") == 0) {
1412 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1413 // private and are processed in process_sun_java_launcher_properties();
1414 // the sun.java.launcher property is passed on to the java application
1415 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1416 // append is true, writable is true, internal is false
1417 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1418 WriteableProperty, ExternalProperty);
1419 } else {
1420 if (strcmp(key, "sun.java.command") == 0) {
1421 char *old_java_command = _java_command;
1422 _java_command = os::strdup_check_oom(value, mtArguments);
1423 if (old_java_command != NULL) {
1424 os::free(old_java_command);
1425 }
1426 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1427 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1428 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1429 // its value without going through the property list or making a Java call.
1430 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1431 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1432 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1433 os::free((void *)old_java_vendor_url_bug);
1434 }
1435 }
1436
1437 // Create new property and add at the end of the list
1438 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1439 }
1440
1441 if (key != prop) {
1442 // SystemProperty copy passed value, thus free previously allocated
1443 // memory
1444 FreeHeap((void *)key);
1445 }
1446
1447 return true;
1448 }
1449
1450 #if INCLUDE_CDS
1451 void Arguments::check_unsupported_dumping_properties() {
1452 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1453 const char* unsupported_properties[] = { "jdk.module.main",
1454 "jdk.module.limitmods",
1455 "jdk.module.path",
1456 "jdk.module.upgrade.path",
1457 "jdk.module.patch.0" };
1458 const char* unsupported_options[] = { "-m", // cannot use at dump time
1459 "--limit-modules", // ignored at dump time
1460 "--module-path", // ignored at dump time
1461 "--upgrade-module-path", // ignored at dump time
1462 "--patch-module" // ignored at dump time
1463 };
1464 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1465 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1466 // vm will exit with an error message. Otherwise, it will print an informational message if
1467 // -Xlog:cds is enabled.
1468 uint info_idx = 1;
1469 SystemProperty* sp = system_properties();
1470 while (sp != NULL) {
1471 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1472 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1473 if (i < info_idx) {
1474 vm_exit_during_initialization(
1475 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1476 } else {
1477 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1478 unsupported_options[i]);
1479 }
1480 }
1481 }
1482 sp = sp->next();
1483 }
1484
1485 // Check for an exploded module build in use with -Xshare:dump.
1486 if (!has_jimage()) {
1487 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1488 }
1489 }
1490 #endif
1491
1492 //===========================================================================================================
1493 // Setting int/mixed/comp mode flags
1494
1495 void Arguments::set_mode_flags(Mode mode) {
1496 // Set up default values for all flags.
1497 // If you add a flag to any of the branches below,
1498 // add a default value for it here.
1499 set_java_compiler(false);
1500 _mode = mode;
1501
1502 // Ensure Agent_OnLoad has the correct initial values.
1503 // This may not be the final mode; mode may change later in onload phase.
1504 PropertyList_unique_add(&_system_properties, "java.vm.info",
1505 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1506
1507 UseInterpreter = true;
1508 UseCompiler = true;
1509 UseLoopCounter = true;
1510
1511 // Default values may be platform/compiler dependent -
1512 // use the saved values
1513 ClipInlining = Arguments::_ClipInlining;
1514 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1515 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1516 BackgroundCompilation = Arguments::_BackgroundCompilation;
1517 if (TieredCompilation) {
1518 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1519 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1520 }
1521 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1522 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1523 }
1524 }
1525
1526 // Change from defaults based on mode
1527 switch (mode) {
1528 default:
1529 ShouldNotReachHere();
1530 break;
1531 case _int:
1532 UseCompiler = false;
1533 UseLoopCounter = false;
1534 AlwaysCompileLoopMethods = false;
1535 UseOnStackReplacement = false;
1536 break;
1537 case _mixed:
1538 // same as default
1539 break;
1540 case _comp:
1541 UseInterpreter = false;
1542 BackgroundCompilation = false;
1543 ClipInlining = false;
1544 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1545 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1546 // compile a level 4 (C2) and then continue executing it.
1547 if (TieredCompilation) {
1548 Tier3InvokeNotifyFreqLog = 0;
1549 Tier4InvocationThreshold = 0;
1550 }
1551 break;
1552 }
1553 }
1554
1555 // Conflict: required to use shared spaces (-Xshare:on), but
1556 // incompatible command line options were chosen.
1557 static void no_shared_spaces(const char* message) {
1558 if (RequireSharedSpaces) {
1559 jio_fprintf(defaultStream::error_stream(),
1560 "Class data sharing is inconsistent with other specified options.\n");
1561 vm_exit_during_initialization("Unable to use shared archive.", message);
1562 } else {
1563 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1564 }
1565 }
1566
1567 // Returns threshold scaled with the value of scale.
1568 // If scale < 0.0, threshold is returned without scaling.
1569 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1570 if (scale == 1.0 || scale < 0.0) {
1571 return threshold;
1572 } else {
1573 return (intx)(threshold * scale);
1574 }
1575 }
1576
1577 // Returns freq_log scaled with the value of scale.
1578 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1579 // If scale < 0.0, freq_log is returned without scaling.
1580 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1581 // Check if scaling is necessary or if negative value was specified.
1582 if (scale == 1.0 || scale < 0.0) {
1583 return freq_log;
1584 }
1585 // Check values to avoid calculating log2 of 0.
1586 if (scale == 0.0 || freq_log == 0) {
1587 return 0;
1588 }
1589 // Determine the maximum notification frequency value currently supported.
1590 // The largest mask value that the interpreter/C1 can handle is
1591 // of length InvocationCounter::number_of_count_bits. Mask values are always
1592 // one bit shorter then the value of the notification frequency. Set
1593 // max_freq_bits accordingly.
1594 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1595 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1596 if (scaled_freq == 0) {
1597 // Return 0 right away to avoid calculating log2 of 0.
1598 return 0;
1599 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1600 return max_freq_bits;
1601 } else {
1602 return log2_intptr(scaled_freq);
1603 }
1604 }
1605
1606 void Arguments::set_tiered_flags() {
1607 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1608 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1609 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1610 }
1611 if (CompilationPolicyChoice < 2) {
1612 vm_exit_during_initialization(
1613 "Incompatible compilation policy selected", NULL);
1614 }
1615 // Increase the code cache size - tiered compiles a lot more.
1616 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1617 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1618 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1619 }
1620 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1621 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1622 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1623 }
1624 if (!UseInterpreter) { // -Xcomp
1625 Tier3InvokeNotifyFreqLog = 0;
1626 Tier4InvocationThreshold = 0;
1627 }
1628
1629 if (CompileThresholdScaling < 0) {
1630 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1631 }
1632
1633 // Scale tiered compilation thresholds.
1634 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1635 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1636 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1637 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1638
1639 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1640 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1641 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1642 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1643
1644 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1645 // once these thresholds become supported.
1646
1647 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1648 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1649
1650 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1651 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1652
1653 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1654
1655 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1656 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1657 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1658 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1659 }
1660 }
1661
1662 void set_object_alignment() {
1663 // Object alignment.
1664 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1665 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1666 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1667 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1668 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1669 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1670
1671 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1672 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1673
1674 // Oop encoding heap max
1675 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1676
1677 if (SurvivorAlignmentInBytes == 0) {
1678 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1679 }
1680 }
1681
1682 size_t Arguments::max_heap_for_compressed_oops() {
1683 // Avoid sign flip.
1684 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1685 // We need to fit both the NULL page and the heap into the memory budget, while
1686 // keeping alignment constraints of the heap. To guarantee the latter, as the
1687 // NULL page is located before the heap, we pad the NULL page to the conservative
1688 // maximum alignment that the GC may ever impose upon the heap.
1689 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1690 _conservative_max_heap_alignment);
1691
1692 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1693 NOT_LP64(ShouldNotReachHere(); return 0);
1694 }
1695
1696 void Arguments::set_use_compressed_oops() {
1697 #ifndef ZERO
1698 #ifdef _LP64
1699 // MaxHeapSize is not set up properly at this point, but
1700 // the only value that can override MaxHeapSize if we are
1701 // to use UseCompressedOops is InitialHeapSize.
1702 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1703
1704 if (max_heap_size <= max_heap_for_compressed_oops()) {
1705 #if !defined(COMPILER1) || defined(TIERED)
1706 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1707 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1708 }
1709 #endif
1710 } else {
1711 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1712 warning("Max heap size too large for Compressed Oops");
1713 FLAG_SET_DEFAULT(UseCompressedOops, false);
1714 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1715 }
1716 }
1717 #endif // _LP64
1718 #endif // ZERO
1719 }
1720
1721
1722 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1723 // set_use_compressed_oops().
1724 void Arguments::set_use_compressed_klass_ptrs() {
1725 #ifndef ZERO
1726 #ifdef _LP64
1727 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1728 if (!UseCompressedOops) {
1729 if (UseCompressedClassPointers) {
1730 warning("UseCompressedClassPointers requires UseCompressedOops");
1731 }
1732 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1733 } else {
1734 // Turn on UseCompressedClassPointers too
1735 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1736 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1737 }
1738 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1739 if (UseCompressedClassPointers) {
1740 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1741 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1742 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1743 }
1744 }
1745 }
1746 #endif // _LP64
1747 #endif // !ZERO
1748 }
1749
1750 void Arguments::set_conservative_max_heap_alignment() {
1751 // The conservative maximum required alignment for the heap is the maximum of
1752 // the alignments imposed by several sources: any requirements from the heap
1753 // itself, the collector policy and the maximum page size we may run the VM
1754 // with.
1755 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1756 _conservative_max_heap_alignment = MAX4(heap_alignment,
1757 (size_t)os::vm_allocation_granularity(),
1758 os::max_page_size(),
1759 CollectorPolicy::compute_heap_alignment());
1760 }
1761
1762 #ifdef TIERED
1763 bool Arguments::compilation_mode_selected() {
1764 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1765 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1766
1767 }
1768
1769 void Arguments::select_compilation_mode_ergonomically() {
1770 #if defined(_WINDOWS) && !defined(_LP64)
1771 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1772 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1773 }
1774 #endif
1775 if (NeverActAsServerClassMachine) {
1776 set_client_compilation_mode();
1777 }
1778 }
1779 #endif //TIERED
1780
1781 #if INCLUDE_JVMCI
1782 void Arguments::set_jvmci_specific_flags() {
1783 if (UseJVMCICompiler) {
1784 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1785 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1786 }
1787 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1788 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1789 }
1790 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1791 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1792 }
1793 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1794 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1795 }
1796 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1797 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1798 }
1799 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1800 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1801 }
1802 if (TieredStopAtLevel != CompLevel_full_optimization) {
1803 // Currently JVMCI compiler can only work at the full optimization level
1804 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1805 TieredStopAtLevel = CompLevel_full_optimization;
1806 }
1807 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1808 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1809 }
1810 }
1811 }
1812 #endif
1813
1814 jint Arguments::set_ergonomics_flags() {
1815 #ifdef TIERED
1816 if (!compilation_mode_selected()) {
1817 select_compilation_mode_ergonomically();
1818 }
1819 #endif
1820
1821 GCConfig::initialize();
1822
1823 #if COMPILER2_OR_JVMCI
1824 // Shared spaces work fine with other GCs but causes bytecode rewriting
1825 // to be disabled, which hurts interpreter performance and decreases
1826 // server performance. When -server is specified, keep the default off
1827 // unless it is asked for. Future work: either add bytecode rewriting
1828 // at link time, or rewrite bytecodes in non-shared methods.
1829 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1830 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1831 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1832 }
1833 #endif
1834
1835 #if defined(IA32)
1836 // Only server compiler can optimize safepoints well enough.
1837 if (!is_server_compilation_mode_vm()) {
1838 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1839 }
1840 #endif
1841
1842 set_conservative_max_heap_alignment();
1843
1844 #ifndef ZERO
1845 #ifdef _LP64
1846 set_use_compressed_oops();
1847
1848 // set_use_compressed_klass_ptrs() must be called after calling
1849 // set_use_compressed_oops().
1850 set_use_compressed_klass_ptrs();
1851
1852 // Also checks that certain machines are slower with compressed oops
1853 // in vm_version initialization code.
1854 #endif // _LP64
1855 #endif // !ZERO
1856
1857 return JNI_OK;
1858 }
1859
1860 julong Arguments::limit_by_allocatable_memory(julong limit) {
1861 julong max_allocatable;
1862 julong result = limit;
1863 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1864 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1865 }
1866 return result;
1867 }
1868
1869 // Use static initialization to get the default before parsing
1870 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1871
1872 void Arguments::set_heap_size() {
1873 julong phys_mem =
1874 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1875 : (julong)MaxRAM;
1876
1877 // Convert deprecated flags
1878 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1879 !FLAG_IS_DEFAULT(MaxRAMFraction))
1880 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1881
1882 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1883 !FLAG_IS_DEFAULT(MinRAMFraction))
1884 MinRAMPercentage = 100.0 / MinRAMFraction;
1885
1886 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1887 !FLAG_IS_DEFAULT(InitialRAMFraction))
1888 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1889
1890 // If the maximum heap size has not been set with -Xmx,
1891 // then set it as fraction of the size of physical memory,
1892 // respecting the maximum and minimum sizes of the heap.
1893 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1894 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1895 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1896 if (reasonable_min < MaxHeapSize) {
1897 // Small physical memory, so use a minimum fraction of it for the heap
1898 reasonable_max = reasonable_min;
1899 } else {
1900 // Not-small physical memory, so require a heap at least
1901 // as large as MaxHeapSize
1902 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1903 }
1904
1905 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1906 // Limit the heap size to ErgoHeapSizeLimit
1907 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1908 }
1909 if (UseCompressedOops) {
1910 // Limit the heap size to the maximum possible when using compressed oops
1911 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1912
1913 // HeapBaseMinAddress can be greater than default but not less than.
1914 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1915 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1916 // matches compressed oops printing flags
1917 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1918 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1919 DefaultHeapBaseMinAddress,
1920 DefaultHeapBaseMinAddress/G,
1921 HeapBaseMinAddress);
1922 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1923 }
1924 }
1925
1926 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1927 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1928 // but it should be not less than default MaxHeapSize.
1929 max_coop_heap -= HeapBaseMinAddress;
1930 }
1931 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1932 }
1933 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1934
1935 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1936 // An initial heap size was specified on the command line,
1937 // so be sure that the maximum size is consistent. Done
1938 // after call to limit_by_allocatable_memory because that
1939 // method might reduce the allocation size.
1940 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1941 }
1942
1943 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1944 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1945 }
1946
1947 // If the minimum or initial heap_size have not been set or requested to be set
1948 // ergonomically, set them accordingly.
1949 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1950 julong reasonable_minimum = (julong)(OldSize + NewSize);
1951
1952 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1953
1954 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1955
1956 if (InitialHeapSize == 0) {
1957 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1958
1959 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1960 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1961
1962 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1963
1964 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1965 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1966 }
1967 // If the minimum heap size has not been set (via -Xms),
1968 // synchronize with InitialHeapSize to avoid errors with the default value.
1969 if (min_heap_size() == 0) {
1970 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1971 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1972 }
1973 }
1974 }
1975
1976 // This option inspects the machine and attempts to set various
1977 // parameters to be optimal for long-running, memory allocation
1978 // intensive jobs. It is intended for machines with large
1979 // amounts of cpu and memory.
1980 jint Arguments::set_aggressive_heap_flags() {
1981 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1982 // VM, but we may not be able to represent the total physical memory
1983 // available (like having 8gb of memory on a box but using a 32bit VM).
1984 // Thus, we need to make sure we're using a julong for intermediate
1985 // calculations.
1986 julong initHeapSize;
1987 julong total_memory = os::physical_memory();
1988
1989 if (total_memory < (julong) 256 * M) {
1990 jio_fprintf(defaultStream::error_stream(),
1991 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1992 vm_exit(1);
1993 }
1994
1995 // The heap size is half of available memory, or (at most)
1996 // all of possible memory less 160mb (leaving room for the OS
1997 // when using ISM). This is the maximum; because adaptive sizing
1998 // is turned on below, the actual space used may be smaller.
1999
2000 initHeapSize = MIN2(total_memory / (julong) 2,
2001 total_memory - (julong) 160 * M);
2002
2003 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2004
2005 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2006 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2007 return JNI_EINVAL;
2008 }
2009 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2010 return JNI_EINVAL;
2011 }
2012 // Currently the minimum size and the initial heap sizes are the same.
2013 set_min_heap_size(initHeapSize);
2014 }
2015 if (FLAG_IS_DEFAULT(NewSize)) {
2016 // Make the young generation 3/8ths of the total heap.
2017 if (FLAG_SET_CMDLINE(size_t, NewSize,
2018 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2019 return JNI_EINVAL;
2020 }
2021 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2022 return JNI_EINVAL;
2023 }
2024 }
2025
2026 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2027 FLAG_SET_DEFAULT(UseLargePages, true);
2028 #endif
2029
2030 // Increase some data structure sizes for efficiency
2031 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2032 return JNI_EINVAL;
2033 }
2034 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2035 return JNI_EINVAL;
2036 }
2037 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2038 return JNI_EINVAL;
2039 }
2040
2041 // See the OldPLABSize comment below, but replace 'after promotion'
2042 // with 'after copying'. YoungPLABSize is the size of the survivor
2043 // space per-gc-thread buffers. The default is 4kw.
2044 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2045 return JNI_EINVAL;
2046 }
2047
2048 // OldPLABSize is the size of the buffers in the old gen that
2049 // UseParallelGC uses to promote live data that doesn't fit in the
2050 // survivor spaces. At any given time, there's one for each gc thread.
2051 // The default size is 1kw. These buffers are rarely used, since the
2052 // survivor spaces are usually big enough. For specjbb, however, there
2053 // are occasions when there's lots of live data in the young gen
2054 // and we end up promoting some of it. We don't have a definite
2055 // explanation for why bumping OldPLABSize helps, but the theory
2056 // is that a bigger PLAB results in retaining something like the
2057 // original allocation order after promotion, which improves mutator
2058 // locality. A minor effect may be that larger PLABs reduce the
2059 // number of PLAB allocation events during gc. The value of 8kw
2060 // was arrived at by experimenting with specjbb.
2061 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2062 return JNI_EINVAL;
2063 }
2064
2065 // Enable parallel GC and adaptive generation sizing
2066 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2067 return JNI_EINVAL;
2068 }
2069
2070 // Encourage steady state memory management
2071 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2072 return JNI_EINVAL;
2073 }
2074
2075 // This appears to improve mutator locality
2076 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2077 return JNI_EINVAL;
2078 }
2079
2080 // Get around early Solaris scheduling bug
2081 // (affinity vs other jobs on system)
2082 // but disallow DR and offlining (5008695).
2083 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2084 return JNI_EINVAL;
2085 }
2086
2087 return JNI_OK;
2088 }
2089
2090 // This must be called after ergonomics.
2091 void Arguments::set_bytecode_flags() {
2092 if (!RewriteBytecodes) {
2093 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2094 }
2095 }
2096
2097 // Aggressive optimization flags -XX:+AggressiveOpts
2098 jint Arguments::set_aggressive_opts_flags() {
2099 #ifdef COMPILER2
2100 if (AggressiveUnboxing) {
2101 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2102 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2103 } else if (!EliminateAutoBox) {
2104 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2105 AggressiveUnboxing = false;
2106 }
2107 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2108 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2109 } else if (!DoEscapeAnalysis) {
2110 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2111 AggressiveUnboxing = false;
2112 }
2113 }
2114 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2115 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2116 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2117 }
2118 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2119 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2120 }
2121
2122 // Feed the cache size setting into the JDK
2123 char buffer[1024];
2124 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2125 if (!add_property(buffer)) {
2126 return JNI_ENOMEM;
2127 }
2128 }
2129 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2130 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2131 }
2132 #endif
2133
2134 if (AggressiveOpts) {
2135 // Sample flag setting code
2136 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2137 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2138 // }
2139 }
2140
2141 return JNI_OK;
2142 }
2143
2144 //===========================================================================================================
2145 // Parsing of java.compiler property
2146
2147 void Arguments::process_java_compiler_argument(const char* arg) {
2148 // For backwards compatibility, Djava.compiler=NONE or ""
2149 // causes us to switch to -Xint mode UNLESS -Xdebug
2150 // is also specified.
2151 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2152 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2153 }
2154 }
2155
2156 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2157 _sun_java_launcher = os::strdup_check_oom(launcher);
2158 }
2159
2160 bool Arguments::created_by_java_launcher() {
2161 assert(_sun_java_launcher != NULL, "property must have value");
2162 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2163 }
2164
2165 bool Arguments::sun_java_launcher_is_altjvm() {
2166 return _sun_java_launcher_is_altjvm;
2167 }
2168
2169 //===========================================================================================================
2170 // Parsing of main arguments
2171
2172 #if INCLUDE_JVMCI
2173 // Check consistency of jvmci vm argument settings.
2174 bool Arguments::check_jvmci_args_consistency() {
2175 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2176 }
2177 #endif //INCLUDE_JVMCI
2178
2179 // Check the consistency of vm_init_args
2180 bool Arguments::check_vm_args_consistency() {
2181 // Method for adding checks for flag consistency.
2182 // The intent is to warn the user of all possible conflicts,
2183 // before returning an error.
2184 // Note: Needs platform-dependent factoring.
2185 bool status = true;
2186
2187 if (TLABRefillWasteFraction == 0) {
2188 jio_fprintf(defaultStream::error_stream(),
2189 "TLABRefillWasteFraction should be a denominator, "
2190 "not " SIZE_FORMAT "\n",
2191 TLABRefillWasteFraction);
2192 status = false;
2193 }
2194
2195 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2196 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2197 }
2198
2199 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2200 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2201 }
2202
2203 if (GCTimeLimit == 100) {
2204 // Turn off gc-overhead-limit-exceeded checks
2205 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2206 }
2207
2208 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2209 // insists that we hold the requisite locks so that the iteration is
2210 // MT-safe. For the verification at start-up and shut-down, we don't
2211 // yet have a good way of acquiring and releasing these locks,
2212 // which are not visible at the CollectedHeap level. We want to
2213 // be able to acquire these locks and then do the iteration rather
2214 // than just disable the lock verification. This will be fixed under
2215 // bug 4788986.
2216 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2217 if (VerifyDuringStartup) {
2218 warning("Heap verification at start-up disabled "
2219 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2220 VerifyDuringStartup = false; // Disable verification at start-up
2221 }
2222
2223 if (VerifyBeforeExit) {
2224 warning("Heap verification at shutdown disabled "
2225 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2226 VerifyBeforeExit = false; // Disable verification at shutdown
2227 }
2228 }
2229
2230 if (PrintNMTStatistics) {
2231 #if INCLUDE_NMT
2232 if (MemTracker::tracking_level() == NMT_off) {
2233 #endif // INCLUDE_NMT
2234 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2235 PrintNMTStatistics = false;
2236 #if INCLUDE_NMT
2237 }
2238 #endif
2239 }
2240
2241 #if INCLUDE_JVMCI
2242 status = status && check_jvmci_args_consistency();
2243
2244 if (EnableJVMCI) {
2245 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2246 AddProperty, UnwriteableProperty, InternalProperty);
2247
2248 if (!ScavengeRootsInCode) {
2249 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2250 ScavengeRootsInCode = 1;
2251 }
2252 }
2253 #endif
2254
2255 // Check lower bounds of the code cache
2256 // Template Interpreter code is approximately 3X larger in debug builds.
2257 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2258 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2259 jio_fprintf(defaultStream::error_stream(),
2260 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2261 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2262 status = false;
2263 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2264 jio_fprintf(defaultStream::error_stream(),
2265 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2266 min_code_cache_size/K);
2267 status = false;
2268 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2269 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2270 jio_fprintf(defaultStream::error_stream(),
2271 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2272 CODE_CACHE_SIZE_LIMIT/M);
2273 status = false;
2274 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2275 jio_fprintf(defaultStream::error_stream(),
2276 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2277 min_code_cache_size/K);
2278 status = false;
2279 }
2280
2281 #ifdef _LP64
2282 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2283 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2284 }
2285 #endif
2286
2287 #ifndef SUPPORT_RESERVED_STACK_AREA
2288 if (StackReservedPages != 0) {
2289 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2290 warning("Reserved Stack Area not supported on this platform");
2291 }
2292 #endif
2293
2294 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2295 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2296 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2297 }
2298 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2299 }
2300 if (UseCompiler && is_interpreter_only()) {
2301 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2302 warning("UseCompiler disabled due to -Xint.");
2303 }
2304 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2305 }
2306 #ifdef COMPILER2
2307 if (PostLoopMultiversioning && !RangeCheckElimination) {
2308 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2309 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2310 }
2311 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2312 }
2313 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2314 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2315 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2316 }
2317 LoopStripMiningIter = 1;
2318 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2319 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2320 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2321 }
2322 LoopStripMiningIter = 0;
2323 }
2324 #endif
2325 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2326 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2327 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2328 }
2329 }
2330 return status;
2331 }
2332
2333 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2334 const char* option_type) {
2335 if (ignore) return false;
2336
2337 const char* spacer = " ";
2338 if (option_type == NULL) {
2339 option_type = ++spacer; // Set both to the empty string.
2340 }
2341
2342 if (os::obsolete_option(option)) {
2343 jio_fprintf(defaultStream::error_stream(),
2344 "Obsolete %s%soption: %s\n", option_type, spacer,
2345 option->optionString);
2346 return false;
2347 } else {
2348 jio_fprintf(defaultStream::error_stream(),
2349 "Unrecognized %s%soption: %s\n", option_type, spacer,
2350 option->optionString);
2351 return true;
2352 }
2353 }
2354
2355 static const char* user_assertion_options[] = {
2356 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2357 };
2358
2359 static const char* system_assertion_options[] = {
2360 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2361 };
2362
2363 bool Arguments::parse_uintx(const char* value,
2364 uintx* uintx_arg,
2365 uintx min_size) {
2366
2367 // Check the sign first since atojulong() parses only unsigned values.
2368 bool value_is_positive = !(*value == '-');
2369
2370 if (value_is_positive) {
2371 julong n;
2372 bool good_return = atojulong(value, &n);
2373 if (good_return) {
2374 bool above_minimum = n >= min_size;
2375 bool value_is_too_large = n > max_uintx;
2376
2377 if (above_minimum && !value_is_too_large) {
2378 *uintx_arg = n;
2379 return true;
2380 }
2381 }
2382 }
2383 return false;
2384 }
2385
2386 unsigned int addreads_count = 0;
2387 unsigned int addexports_count = 0;
2388 unsigned int addopens_count = 0;
2389 unsigned int addmods_count = 0;
2390 unsigned int patch_mod_count = 0;
2391
2392 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2393 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2394 char* property = AllocateHeap(prop_len, mtArguments);
2395 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2396 if (ret < 0 || ret >= (int)prop_len) {
2397 FreeHeap(property);
2398 return false;
2399 }
2400 bool added = add_property(property, UnwriteableProperty, internal);
2401 FreeHeap(property);
2402 return added;
2403 }
2404
2405 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2406 const unsigned int props_count_limit = 1000;
2407 const int max_digits = 3;
2408 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2409
2410 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2411 if (count < props_count_limit) {
2412 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2413 char* property = AllocateHeap(prop_len, mtArguments);
2414 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2415 if (ret < 0 || ret >= (int)prop_len) {
2416 FreeHeap(property);
2417 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2418 return false;
2419 }
2420 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2421 FreeHeap(property);
2422 return added;
2423 }
2424
2425 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2426 return false;
2427 }
2428
2429 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2430 julong* long_arg,
2431 julong min_size,
2432 julong max_size) {
2433 if (!atojulong(s, long_arg)) return arg_unreadable;
2434 return check_memory_size(*long_arg, min_size, max_size);
2435 }
2436
2437 // Parse JavaVMInitArgs structure
2438
2439 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2440 const JavaVMInitArgs *java_options_args,
2441 const JavaVMInitArgs *cmd_line_args) {
2442 bool patch_mod_javabase = false;
2443
2444 // Save default settings for some mode flags
2445 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2446 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2447 Arguments::_ClipInlining = ClipInlining;
2448 Arguments::_BackgroundCompilation = BackgroundCompilation;
2449 if (TieredCompilation) {
2450 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2451 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2452 }
2453
2454 // Setup flags for mixed which is the default
2455 set_mode_flags(_mixed);
2456
2457 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2458 // variable (if present).
2459 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2460 if (result != JNI_OK) {
2461 return result;
2462 }
2463
2464 // Parse args structure generated from the command line flags.
2465 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2466 if (result != JNI_OK) {
2467 return result;
2468 }
2469
2470 // Parse args structure generated from the _JAVA_OPTIONS environment
2471 // variable (if present) (mimics classic VM)
2472 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2473 if (result != JNI_OK) {
2474 return result;
2475 }
2476
2477 // We need to ensure processor and memory resources have been properly
2478 // configured - which may rely on arguments we just processed - before
2479 // doing the final argument processing. Any argument processing that
2480 // needs to know about processor and memory resources must occur after
2481 // this point.
2482
2483 os::init_container_support();
2484
2485 // Do final processing now that all arguments have been parsed
2486 result = finalize_vm_init_args(patch_mod_javabase);
2487 if (result != JNI_OK) {
2488 return result;
2489 }
2490
2491 return JNI_OK;
2492 }
2493
2494 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2495 // represents a valid JDWP agent. is_path==true denotes that we
2496 // are dealing with -agentpath (case where name is a path), otherwise with
2497 // -agentlib
2498 bool valid_jdwp_agent(char *name, bool is_path) {
2499 char *_name;
2500 const char *_jdwp = "jdwp";
2501 size_t _len_jdwp, _len_prefix;
2502
2503 if (is_path) {
2504 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2505 return false;
2506 }
2507
2508 _name++; // skip past last path separator
2509 _len_prefix = strlen(JNI_LIB_PREFIX);
2510
2511 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2512 return false;
2513 }
2514
2515 _name += _len_prefix;
2516 _len_jdwp = strlen(_jdwp);
2517
2518 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2519 _name += _len_jdwp;
2520 }
2521 else {
2522 return false;
2523 }
2524
2525 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2526 return false;
2527 }
2528
2529 return true;
2530 }
2531
2532 if (strcmp(name, _jdwp) == 0) {
2533 return true;
2534 }
2535
2536 return false;
2537 }
2538
2539 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2540 // --patch-module=<module>=<file>(<pathsep><file>)*
2541 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2542 // Find the equal sign between the module name and the path specification
2543 const char* module_equal = strchr(patch_mod_tail, '=');
2544 if (module_equal == NULL) {
2545 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2546 return JNI_ERR;
2547 } else {
2548 // Pick out the module name
2549 size_t module_len = module_equal - patch_mod_tail;
2550 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2551 if (module_name != NULL) {
2552 memcpy(module_name, patch_mod_tail, module_len);
2553 *(module_name + module_len) = '\0';
2554 // The path piece begins one past the module_equal sign
2555 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2556 FREE_C_HEAP_ARRAY(char, module_name);
2557 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2558 return JNI_ENOMEM;
2559 }
2560 } else {
2561 return JNI_ENOMEM;
2562 }
2563 }
2564 return JNI_OK;
2565 }
2566
2567 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2568 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2569 // The min and max sizes match the values in globals.hpp, but scaled
2570 // with K. The values have been chosen so that alignment with page
2571 // size doesn't change the max value, which makes the conversions
2572 // back and forth between Xss value and ThreadStackSize value easier.
2573 // The values have also been chosen to fit inside a 32-bit signed type.
2574 const julong min_ThreadStackSize = 0;
2575 const julong max_ThreadStackSize = 1 * M;
2576
2577 const julong min_size = min_ThreadStackSize * K;
2578 const julong max_size = max_ThreadStackSize * K;
2579
2580 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2581
2582 julong size = 0;
2583 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2584 if (errcode != arg_in_range) {
2585 bool silent = (option == NULL); // Allow testing to silence error messages
2586 if (!silent) {
2587 jio_fprintf(defaultStream::error_stream(),
2588 "Invalid thread stack size: %s\n", option->optionString);
2589 describe_range_error(errcode);
2590 }
2591 return JNI_EINVAL;
2592 }
2593
2594 // Internally track ThreadStackSize in units of 1024 bytes.
2595 const julong size_aligned = align_up(size, K);
2596 assert(size <= size_aligned,
2597 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2598 size, size_aligned);
2599
2600 const julong size_in_K = size_aligned / K;
2601 assert(size_in_K < (julong)max_intx,
2602 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2603 size_in_K);
2604
2605 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2606 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2607 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2608 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2609 max_expanded, size_in_K);
2610
2611 *out_ThreadStackSize = (intx)size_in_K;
2612
2613 return JNI_OK;
2614 }
2615
2616 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2617 // For match_option to return remaining or value part of option string
2618 const char* tail;
2619
2620 // iterate over arguments
2621 for (int index = 0; index < args->nOptions; index++) {
2622 bool is_absolute_path = false; // for -agentpath vs -agentlib
2623
2624 const JavaVMOption* option = args->options + index;
2625
2626 if (!match_option(option, "-Djava.class.path", &tail) &&
2627 !match_option(option, "-Dsun.java.command", &tail) &&
2628 !match_option(option, "-Dsun.java.launcher", &tail)) {
2629
2630 // add all jvm options to the jvm_args string. This string
2631 // is used later to set the java.vm.args PerfData string constant.
2632 // the -Djava.class.path and the -Dsun.java.command options are
2633 // omitted from jvm_args string as each have their own PerfData
2634 // string constant object.
2635 build_jvm_args(option->optionString);
2636 }
2637
2638 // -verbose:[class/module/gc/jni]
2639 if (match_option(option, "-verbose", &tail)) {
2640 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2641 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2642 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2643 } else if (!strcmp(tail, ":module")) {
2644 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2645 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2646 } else if (!strcmp(tail, ":gc")) {
2647 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2648 } else if (!strcmp(tail, ":jni")) {
2649 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 }
2653 // -da / -ea / -disableassertions / -enableassertions
2654 // These accept an optional class/package name separated by a colon, e.g.,
2655 // -da:java.lang.Thread.
2656 } else if (match_option(option, user_assertion_options, &tail, true)) {
2657 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2658 if (*tail == '\0') {
2659 JavaAssertions::setUserClassDefault(enable);
2660 } else {
2661 assert(*tail == ':', "bogus match by match_option()");
2662 JavaAssertions::addOption(tail + 1, enable);
2663 }
2664 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2665 } else if (match_option(option, system_assertion_options, &tail, false)) {
2666 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2667 JavaAssertions::setSystemClassDefault(enable);
2668 // -bootclasspath:
2669 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2670 jio_fprintf(defaultStream::output_stream(),
2671 "-Xbootclasspath is no longer a supported option.\n");
2672 return JNI_EINVAL;
2673 // -bootclasspath/a:
2674 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2675 Arguments::append_sysclasspath(tail);
2676 // -bootclasspath/p:
2677 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2678 jio_fprintf(defaultStream::output_stream(),
2679 "-Xbootclasspath/p is no longer a supported option.\n");
2680 return JNI_EINVAL;
2681 // -Xrun
2682 } else if (match_option(option, "-Xrun", &tail)) {
2683 if (tail != NULL) {
2684 const char* pos = strchr(tail, ':');
2685 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2686 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2687 jio_snprintf(name, len + 1, "%s", tail);
2688
2689 char *options = NULL;
2690 if(pos != NULL) {
2691 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2692 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2693 }
2694 #if !INCLUDE_JVMTI
2695 if (strcmp(name, "jdwp") == 0) {
2696 jio_fprintf(defaultStream::error_stream(),
2697 "Debugging agents are not supported in this VM\n");
2698 return JNI_ERR;
2699 }
2700 #endif // !INCLUDE_JVMTI
2701 add_init_library(name, options);
2702 }
2703 } else if (match_option(option, "--add-reads=", &tail)) {
2704 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2705 return JNI_ENOMEM;
2706 }
2707 } else if (match_option(option, "--add-exports=", &tail)) {
2708 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2709 return JNI_ENOMEM;
2710 }
2711 } else if (match_option(option, "--add-opens=", &tail)) {
2712 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2713 return JNI_ENOMEM;
2714 }
2715 } else if (match_option(option, "--add-modules=", &tail)) {
2716 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2717 return JNI_ENOMEM;
2718 }
2719 } else if (match_option(option, "--limit-modules=", &tail)) {
2720 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2721 return JNI_ENOMEM;
2722 }
2723 } else if (match_option(option, "--module-path=", &tail)) {
2724 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2725 return JNI_ENOMEM;
2726 }
2727 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2728 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2729 return JNI_ENOMEM;
2730 }
2731 } else if (match_option(option, "--patch-module=", &tail)) {
2732 // --patch-module=<module>=<file>(<pathsep><file>)*
2733 int res = process_patch_mod_option(tail, patch_mod_javabase);
2734 if (res != JNI_OK) {
2735 return res;
2736 }
2737 } else if (match_option(option, "--illegal-access=", &tail)) {
2738 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2739 return JNI_ENOMEM;
2740 }
2741 // -agentlib and -agentpath
2742 } else if (match_option(option, "-agentlib:", &tail) ||
2743 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2744 if(tail != NULL) {
2745 const char* pos = strchr(tail, '=');
2746 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2747 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2748 name[len] = '\0';
2749
2750 char *options = NULL;
2751 if(pos != NULL) {
2752 options = os::strdup_check_oom(pos + 1, mtArguments);
2753 }
2754 #if !INCLUDE_JVMTI
2755 if (valid_jdwp_agent(name, is_absolute_path)) {
2756 jio_fprintf(defaultStream::error_stream(),
2757 "Debugging agents are not supported in this VM\n");
2758 return JNI_ERR;
2759 }
2760 #endif // !INCLUDE_JVMTI
2761 add_init_agent(name, options, is_absolute_path);
2762 }
2763 // -javaagent
2764 } else if (match_option(option, "-javaagent:", &tail)) {
2765 #if !INCLUDE_JVMTI
2766 jio_fprintf(defaultStream::error_stream(),
2767 "Instrumentation agents are not supported in this VM\n");
2768 return JNI_ERR;
2769 #else
2770 if (tail != NULL) {
2771 size_t length = strlen(tail) + 1;
2772 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2773 jio_snprintf(options, length, "%s", tail);
2774 add_instrument_agent("instrument", options, false);
2775 // java agents need module java.instrument
2776 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2777 return JNI_ENOMEM;
2778 }
2779 }
2780 #endif // !INCLUDE_JVMTI
2781 // --enable_preview
2782 } else if (match_option(option, "--enable-preview")) {
2783 set_enable_preview();
2784 // -Xnoclassgc
2785 } else if (match_option(option, "-Xnoclassgc")) {
2786 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2787 return JNI_EINVAL;
2788 }
2789 // -Xconcgc
2790 } else if (match_option(option, "-Xconcgc")) {
2791 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2792 return JNI_EINVAL;
2793 }
2794 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2795 // -Xnoconcgc
2796 } else if (match_option(option, "-Xnoconcgc")) {
2797 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2801 // -Xbatch
2802 } else if (match_option(option, "-Xbatch")) {
2803 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2804 return JNI_EINVAL;
2805 }
2806 // -Xmn for compatibility with other JVM vendors
2807 } else if (match_option(option, "-Xmn", &tail)) {
2808 julong long_initial_young_size = 0;
2809 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2810 if (errcode != arg_in_range) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Invalid initial young generation size: %s\n", option->optionString);
2813 describe_range_error(errcode);
2814 return JNI_EINVAL;
2815 }
2816 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2817 return JNI_EINVAL;
2818 }
2819 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2820 return JNI_EINVAL;
2821 }
2822 // -Xms
2823 } else if (match_option(option, "-Xms", &tail)) {
2824 julong long_initial_heap_size = 0;
2825 // an initial heap size of 0 means automatically determine
2826 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2827 if (errcode != arg_in_range) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Invalid initial heap size: %s\n", option->optionString);
2830 describe_range_error(errcode);
2831 return JNI_EINVAL;
2832 }
2833 set_min_heap_size((size_t)long_initial_heap_size);
2834 // Currently the minimum size and the initial heap sizes are the same.
2835 // Can be overridden with -XX:InitialHeapSize.
2836 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2837 return JNI_EINVAL;
2838 }
2839 // -Xmx
2840 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2841 julong long_max_heap_size = 0;
2842 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2843 if (errcode != arg_in_range) {
2844 jio_fprintf(defaultStream::error_stream(),
2845 "Invalid maximum heap size: %s\n", option->optionString);
2846 describe_range_error(errcode);
2847 return JNI_EINVAL;
2848 }
2849 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2850 return JNI_EINVAL;
2851 }
2852 // Xmaxf
2853 } else if (match_option(option, "-Xmaxf", &tail)) {
2854 char* err;
2855 int maxf = (int)(strtod(tail, &err) * 100);
2856 if (*err != '\0' || *tail == '\0') {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "Bad max heap free percentage size: %s\n",
2859 option->optionString);
2860 return JNI_EINVAL;
2861 } else {
2862 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 }
2866 // Xminf
2867 } else if (match_option(option, "-Xminf", &tail)) {
2868 char* err;
2869 int minf = (int)(strtod(tail, &err) * 100);
2870 if (*err != '\0' || *tail == '\0') {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Bad min heap free percentage size: %s\n",
2873 option->optionString);
2874 return JNI_EINVAL;
2875 } else {
2876 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2877 return JNI_EINVAL;
2878 }
2879 }
2880 // -Xss
2881 } else if (match_option(option, "-Xss", &tail)) {
2882 intx value = 0;
2883 jint err = parse_xss(option, tail, &value);
2884 if (err != JNI_OK) {
2885 return err;
2886 }
2887 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2891 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2892 julong long_ReservedCodeCacheSize = 0;
2893
2894 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2895 if (errcode != arg_in_range) {
2896 jio_fprintf(defaultStream::error_stream(),
2897 "Invalid maximum code cache size: %s.\n", option->optionString);
2898 return JNI_EINVAL;
2899 }
2900 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 // -green
2904 } else if (match_option(option, "-green")) {
2905 jio_fprintf(defaultStream::error_stream(),
2906 "Green threads support not available\n");
2907 return JNI_EINVAL;
2908 // -native
2909 } else if (match_option(option, "-native")) {
2910 // HotSpot always uses native threads, ignore silently for compatibility
2911 // -Xrs
2912 } else if (match_option(option, "-Xrs")) {
2913 // Classic/EVM option, new functionality
2914 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 // -Xprof
2918 } else if (match_option(option, "-Xprof")) {
2919 char version[256];
2920 // Obsolete in JDK 10
2921 JDK_Version::jdk(10).to_string(version, sizeof(version));
2922 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2923 // -Xconcurrentio
2924 } else if (match_option(option, "-Xconcurrentio")) {
2925 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2932 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2933 return JNI_EINVAL;
2934 }
2935 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2936 return JNI_EINVAL;
2937 }
2938
2939 // -Xinternalversion
2940 } else if (match_option(option, "-Xinternalversion")) {
2941 jio_fprintf(defaultStream::output_stream(), "%s\n",
2942 VM_Version::internal_vm_info_string());
2943 vm_exit(0);
2944 #ifndef PRODUCT
2945 // -Xprintflags
2946 } else if (match_option(option, "-Xprintflags")) {
2947 CommandLineFlags::printFlags(tty, false);
2948 vm_exit(0);
2949 #endif
2950 // -D
2951 } else if (match_option(option, "-D", &tail)) {
2952 const char* value;
2953 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2954 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2955 // abort if -Djava.endorsed.dirs is set
2956 jio_fprintf(defaultStream::output_stream(),
2957 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2958 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2959 return JNI_EINVAL;
2960 }
2961 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2962 *value != '\0' && strcmp(value, "\"\"") != 0) {
2963 // abort if -Djava.ext.dirs is set
2964 jio_fprintf(defaultStream::output_stream(),
2965 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2966 return JNI_EINVAL;
2967 }
2968 // Check for module related properties. They must be set using the modules
2969 // options. For example: use "--add-modules=java.sql", not
2970 // "-Djdk.module.addmods=java.sql"
2971 if (is_internal_module_property(option->optionString + 2)) {
2972 needs_module_property_warning = true;
2973 continue;
2974 }
2975
2976 if (!add_property(tail)) {
2977 return JNI_ENOMEM;
2978 }
2979 // Out of the box management support
2980 if (match_option(option, "-Dcom.sun.management", &tail)) {
2981 #if INCLUDE_MANAGEMENT
2982 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2983 return JNI_EINVAL;
2984 }
2985 // management agent in module jdk.management.agent
2986 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2987 return JNI_ENOMEM;
2988 }
2989 #else
2990 jio_fprintf(defaultStream::output_stream(),
2991 "-Dcom.sun.management is not supported in this VM.\n");
2992 return JNI_ERR;
2993 #endif
2994 }
2995 // -Xint
2996 } else if (match_option(option, "-Xint")) {
2997 set_mode_flags(_int);
2998 // -Xmixed
2999 } else if (match_option(option, "-Xmixed")) {
3000 set_mode_flags(_mixed);
3001 // -Xcomp
3002 } else if (match_option(option, "-Xcomp")) {
3003 // for testing the compiler; turn off all flags that inhibit compilation
3004 set_mode_flags(_comp);
3005 // -Xshare:dump
3006 } else if (match_option(option, "-Xshare:dump")) {
3007 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 set_mode_flags(_int); // Prevent compilation, which creates objects
3011 // -Xshare:on
3012 } else if (match_option(option, "-Xshare:on")) {
3013 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3014 return JNI_EINVAL;
3015 }
3016 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3017 return JNI_EINVAL;
3018 }
3019 // -Xshare:auto
3020 } else if (match_option(option, "-Xshare:auto")) {
3021 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3022 return JNI_EINVAL;
3023 }
3024 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 // -Xshare:off
3028 } else if (match_option(option, "-Xshare:off")) {
3029 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3030 return JNI_EINVAL;
3031 }
3032 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3033 return JNI_EINVAL;
3034 }
3035 // -Xverify
3036 } else if (match_option(option, "-Xverify", &tail)) {
3037 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3038 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3042 return JNI_EINVAL;
3043 }
3044 } else if (strcmp(tail, ":remote") == 0) {
3045 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3049 return JNI_EINVAL;
3050 }
3051 } else if (strcmp(tail, ":none") == 0) {
3052 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3056 return JNI_EINVAL;
3057 }
3058 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3059 return JNI_EINVAL;
3060 }
3061 // -Xdebug
3062 } else if (match_option(option, "-Xdebug")) {
3063 // note this flag has been used, then ignore
3064 set_xdebug_mode(true);
3065 // -Xnoagent
3066 } else if (match_option(option, "-Xnoagent")) {
3067 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3068 } else if (match_option(option, "-Xloggc:", &tail)) {
3069 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3070 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3071 _gc_log_filename = os::strdup_check_oom(tail);
3072 } else if (match_option(option, "-Xlog", &tail)) {
3073 bool ret = false;
3074 if (strcmp(tail, ":help") == 0) {
3075 fileStream stream(defaultStream::output_stream());
3076 LogConfiguration::print_command_line_help(&stream);
3077 vm_exit(0);
3078 } else if (strcmp(tail, ":disable") == 0) {
3079 LogConfiguration::disable_logging();
3080 ret = true;
3081 } else if (*tail == '\0') {
3082 ret = LogConfiguration::parse_command_line_arguments();
3083 assert(ret, "-Xlog without arguments should never fail to parse");
3084 } else if (*tail == ':') {
3085 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3086 }
3087 if (ret == false) {
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
3090 tail);
3091 return JNI_EINVAL;
3092 }
3093 // JNI hooks
3094 } else if (match_option(option, "-Xcheck", &tail)) {
3095 if (!strcmp(tail, ":jni")) {
3096 #if !INCLUDE_JNI_CHECK
3097 warning("JNI CHECKING is not supported in this VM");
3098 #else
3099 CheckJNICalls = true;
3100 #endif // INCLUDE_JNI_CHECK
3101 } else if (is_bad_option(option, args->ignoreUnrecognized,
3102 "check")) {
3103 return JNI_EINVAL;
3104 }
3105 } else if (match_option(option, "vfprintf")) {
3106 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3107 } else if (match_option(option, "exit")) {
3108 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3109 } else if (match_option(option, "abort")) {
3110 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3111 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3112 // and the last option wins.
3113 } else if (match_option(option, "-XX:+NeverTenure")) {
3114 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3115 return JNI_EINVAL;
3116 }
3117 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3118 return JNI_EINVAL;
3119 }
3120 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3121 return JNI_EINVAL;
3122 }
3123 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3124 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3128 return JNI_EINVAL;
3129 }
3130 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3134 uintx max_tenuring_thresh = 0;
3135 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3136 jio_fprintf(defaultStream::error_stream(),
3137 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3138 return JNI_EINVAL;
3139 }
3140
3141 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144
3145 if (MaxTenuringThreshold == 0) {
3146 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 } else {
3153 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3154 return JNI_EINVAL;
3155 }
3156 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 }
3160 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3161 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3162 return JNI_EINVAL;
3163 }
3164 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3165 return JNI_EINVAL;
3166 }
3167 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3168 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3169 return JNI_EINVAL;
3170 }
3171 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3175 #if defined(DTRACE_ENABLED)
3176 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3180 return JNI_EINVAL;
3181 }
3182 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3183 return JNI_EINVAL;
3184 }
3185 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 #else // defined(DTRACE_ENABLED)
3189 jio_fprintf(defaultStream::error_stream(),
3190 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3191 return JNI_EINVAL;
3192 #endif // defined(DTRACE_ENABLED)
3193 #ifdef ASSERT
3194 } else if (match_option(option, "-XX:+FullGCALot")) {
3195 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 // disable scavenge before parallel mark-compact
3199 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3200 return JNI_EINVAL;
3201 }
3202 #endif
3203 #if !INCLUDE_MANAGEMENT
3204 } else if (match_option(option, "-XX:+ManagementServer")) {
3205 jio_fprintf(defaultStream::error_stream(),
3206 "ManagementServer is not supported in this VM.\n");
3207 return JNI_ERR;
3208 #endif // INCLUDE_MANAGEMENT
3209 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3210 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3211 // already been handled
3212 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3213 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3214 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3215 return JNI_EINVAL;
3216 }
3217 }
3218 // Unknown option
3219 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3220 return JNI_ERR;
3221 }
3222 }
3223
3224 // PrintSharedArchiveAndExit will turn on
3225 // -Xshare:on
3226 // -Xlog:class+path=info
3227 if (PrintSharedArchiveAndExit) {
3228 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3229 return JNI_EINVAL;
3230 }
3231 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3232 return JNI_EINVAL;
3233 }
3234 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3235 }
3236
3237 // Change the default value for flags which have different default values
3238 // when working with older JDKs.
3239 #ifdef LINUX
3240 if (JDK_Version::current().compare_major(6) <= 0 &&
3241 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3242 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3243 }
3244 #endif // LINUX
3245 fix_appclasspath();
3246 return JNI_OK;
3247 }
3248
3249 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3250 // For java.base check for duplicate --patch-module options being specified on the command line.
3251 // This check is only required for java.base, all other duplicate module specifications
3252 // will be checked during module system initialization. The module system initialization
3253 // will throw an ExceptionInInitializerError if this situation occurs.
3254 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3255 if (*patch_mod_javabase) {
3256 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3257 } else {
3258 *patch_mod_javabase = true;
3259 }
3260 }
3261
3262 // Create GrowableArray lazily, only if --patch-module has been specified
3263 if (_patch_mod_prefix == NULL) {
3264 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3265 }
3266
3267 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3268 }
3269
3270 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3271 //
3272 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3273 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3274 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3275 // path is treated as the current directory.
3276 //
3277 // This causes problems with CDS, which requires that all directories specified in the classpath
3278 // must be empty. In most cases, applications do NOT want to load classes from the current
3279 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3280 // scripts compatible with CDS.
3281 void Arguments::fix_appclasspath() {
3282 if (IgnoreEmptyClassPaths) {
3283 const char separator = *os::path_separator();
3284 const char* src = _java_class_path->value();
3285
3286 // skip over all the leading empty paths
3287 while (*src == separator) {
3288 src ++;
3289 }
3290
3291 char* copy = os::strdup_check_oom(src, mtArguments);
3292
3293 // trim all trailing empty paths
3294 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3295 *tail = '\0';
3296 }
3297
3298 char from[3] = {separator, separator, '\0'};
3299 char to [2] = {separator, '\0'};
3300 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3301 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3302 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3303 }
3304
3305 _java_class_path->set_writeable_value(copy);
3306 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3307 }
3308 }
3309
3310 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3311 // check if the default lib/endorsed directory exists; if so, error
3312 char path[JVM_MAXPATHLEN];
3313 const char* fileSep = os::file_separator();
3314 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3315
3316 DIR* dir = os::opendir(path);
3317 if (dir != NULL) {
3318 jio_fprintf(defaultStream::output_stream(),
3319 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3320 "in modular form will be supported via the concept of upgradeable modules.\n");
3321 os::closedir(dir);
3322 return JNI_ERR;
3323 }
3324
3325 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3326 dir = os::opendir(path);
3327 if (dir != NULL) {
3328 jio_fprintf(defaultStream::output_stream(),
3329 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3330 "Use -classpath instead.\n.");
3331 os::closedir(dir);
3332 return JNI_ERR;
3333 }
3334
3335 // This must be done after all arguments have been processed
3336 // and the container support has been initialized since AggressiveHeap
3337 // relies on the amount of total memory available.
3338 if (AggressiveHeap) {
3339 jint result = set_aggressive_heap_flags();
3340 if (result != JNI_OK) {
3341 return result;
3342 }
3343 }
3344
3345 // This must be done after all arguments have been processed.
3346 // java_compiler() true means set to "NONE" or empty.
3347 if (java_compiler() && !xdebug_mode()) {
3348 // For backwards compatibility, we switch to interpreted mode if
3349 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3350 // not specified.
3351 set_mode_flags(_int);
3352 }
3353
3354 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3355 // but like -Xint, leave compilation thresholds unaffected.
3356 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3357 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3358 set_mode_flags(_int);
3359 }
3360
3361 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3362 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3363 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3364 }
3365
3366 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3367 // Don't degrade server performance for footprint
3368 if (FLAG_IS_DEFAULT(UseLargePages) &&
3369 MaxHeapSize < LargePageHeapSizeThreshold) {
3370 // No need for large granularity pages w/small heaps.
3371 // Note that large pages are enabled/disabled for both the
3372 // Java heap and the code cache.
3373 FLAG_SET_DEFAULT(UseLargePages, false);
3374 }
3375
3376 #elif defined(COMPILER2)
3377 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3378 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3379 }
3380 #endif
3381
3382 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3383 UNSUPPORTED_OPTION(ProfileInterpreter);
3384 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3385 #endif
3386
3387 #ifndef TIERED
3388 // Tiered compilation is undefined.
3389 UNSUPPORTED_OPTION(TieredCompilation);
3390 #endif
3391
3392 #if INCLUDE_JVMCI
3393 if (EnableJVMCI &&
3394 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3395 return JNI_ENOMEM;
3396 }
3397 #endif
3398
3399 if (!check_vm_args_consistency()) {
3400 return JNI_ERR;
3401 }
3402
3403 #if INCLUDE_JVMCI
3404 if (UseJVMCICompiler) {
3405 Compilation_mode = CompMode_server;
3406 }
3407 #endif
3408
3409 #if INCLUDE_CDS
3410 if (DumpSharedSpaces) {
3411 // Disable biased locking now as it interferes with the clean up of
3412 // the archived Klasses and Java string objects (at dump time only).
3413 UseBiasedLocking = false;
3414 }
3415 if (UseSharedSpaces && patch_mod_javabase) {
3416 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3417 }
3418 #endif
3419
3420 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3421 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3422 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3423
3424 return JNI_OK;
3425 }
3426
3427 // Helper class for controlling the lifetime of JavaVMInitArgs
3428 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3429 // deleted on the destruction of the ScopedVMInitArgs object.
3430 class ScopedVMInitArgs : public StackObj {
3431 private:
3432 JavaVMInitArgs _args;
3433 char* _container_name;
3434 bool _is_set;
3435 char* _vm_options_file_arg;
3436
3437 public:
3438 ScopedVMInitArgs(const char *container_name) {
3439 _args.version = JNI_VERSION_1_2;
3440 _args.nOptions = 0;
3441 _args.options = NULL;
3442 _args.ignoreUnrecognized = false;
3443 _container_name = (char *)container_name;
3444 _is_set = false;
3445 _vm_options_file_arg = NULL;
3446 }
3447
3448 // Populates the JavaVMInitArgs object represented by this
3449 // ScopedVMInitArgs object with the arguments in options. The
3450 // allocated memory is deleted by the destructor. If this method
3451 // returns anything other than JNI_OK, then this object is in a
3452 // partially constructed state, and should be abandoned.
3453 jint set_args(GrowableArray<JavaVMOption>* options) {
3454 _is_set = true;
3455 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3456 JavaVMOption, options->length(), mtArguments);
3457 if (options_arr == NULL) {
3458 return JNI_ENOMEM;
3459 }
3460 _args.options = options_arr;
3461
3462 for (int i = 0; i < options->length(); i++) {
3463 options_arr[i] = options->at(i);
3464 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3465 if (options_arr[i].optionString == NULL) {
3466 // Rely on the destructor to do cleanup.
3467 _args.nOptions = i;
3468 return JNI_ENOMEM;
3469 }
3470 }
3471
3472 _args.nOptions = options->length();
3473 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3474 return JNI_OK;
3475 }
3476
3477 JavaVMInitArgs* get() { return &_args; }
3478 char* container_name() { return _container_name; }
3479 bool is_set() { return _is_set; }
3480 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3481 char* vm_options_file_arg() { return _vm_options_file_arg; }
3482
3483 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3484 if (_vm_options_file_arg != NULL) {
3485 os::free(_vm_options_file_arg);
3486 }
3487 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3488 }
3489
3490 ~ScopedVMInitArgs() {
3491 if (_vm_options_file_arg != NULL) {
3492 os::free(_vm_options_file_arg);
3493 }
3494 if (_args.options == NULL) return;
3495 for (int i = 0; i < _args.nOptions; i++) {
3496 os::free(_args.options[i].optionString);
3497 }
3498 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3499 }
3500
3501 // Insert options into this option list, to replace option at
3502 // vm_options_file_pos (-XX:VMOptionsFile)
3503 jint insert(const JavaVMInitArgs* args,
3504 const JavaVMInitArgs* args_to_insert,
3505 const int vm_options_file_pos) {
3506 assert(_args.options == NULL, "shouldn't be set yet");
3507 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3508 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3509
3510 int length = args->nOptions + args_to_insert->nOptions - 1;
3511 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3512 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3513 for (int i = 0; i < args->nOptions; i++) {
3514 if (i == vm_options_file_pos) {
3515 // insert the new options starting at the same place as the
3516 // -XX:VMOptionsFile option
3517 for (int j = 0; j < args_to_insert->nOptions; j++) {
3518 options->push(args_to_insert->options[j]);
3519 }
3520 } else {
3521 options->push(args->options[i]);
3522 }
3523 }
3524 // make into options array
3525 jint result = set_args(options);
3526 delete options;
3527 return result;
3528 }
3529 };
3530
3531 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3532 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3533 }
3534
3535 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3536 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3537 }
3538
3539 jint Arguments::parse_options_environment_variable(const char* name,
3540 ScopedVMInitArgs* vm_args) {
3541 char *buffer = ::getenv(name);
3542
3543 // Don't check this environment variable if user has special privileges
3544 // (e.g. unix su command).
3545 if (buffer == NULL || os::have_special_privileges()) {
3546 return JNI_OK;
3547 }
3548
3549 if ((buffer = os::strdup(buffer)) == NULL) {
3550 return JNI_ENOMEM;
3551 }
3552
3553 jio_fprintf(defaultStream::error_stream(),
3554 "Picked up %s: %s\n", name, buffer);
3555
3556 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3557
3558 os::free(buffer);
3559 return retcode;
3560 }
3561
3562 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3563 // read file into buffer
3564 int fd = ::open(file_name, O_RDONLY);
3565 if (fd < 0) {
3566 jio_fprintf(defaultStream::error_stream(),
3567 "Could not open options file '%s'\n",
3568 file_name);
3569 return JNI_ERR;
3570 }
3571
3572 struct stat stbuf;
3573 int retcode = os::stat(file_name, &stbuf);
3574 if (retcode != 0) {
3575 jio_fprintf(defaultStream::error_stream(),
3576 "Could not stat options file '%s'\n",
3577 file_name);
3578 os::close(fd);
3579 return JNI_ERR;
3580 }
3581
3582 if (stbuf.st_size == 0) {
3583 // tell caller there is no option data and that is ok
3584 os::close(fd);
3585 return JNI_OK;
3586 }
3587
3588 // '+ 1' for NULL termination even with max bytes
3589 size_t bytes_alloc = stbuf.st_size + 1;
3590
3591 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3592 if (NULL == buf) {
3593 jio_fprintf(defaultStream::error_stream(),
3594 "Could not allocate read buffer for options file parse\n");
3595 os::close(fd);
3596 return JNI_ENOMEM;
3597 }
3598
3599 memset(buf, 0, bytes_alloc);
3600
3601 // Fill buffer
3602 // Use ::read() instead of os::read because os::read()
3603 // might do a thread state transition
3604 // and it is too early for that here
3605
3606 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3607 os::close(fd);
3608 if (bytes_read < 0) {
3609 FREE_C_HEAP_ARRAY(char, buf);
3610 jio_fprintf(defaultStream::error_stream(),
3611 "Could not read options file '%s'\n", file_name);
3612 return JNI_ERR;
3613 }
3614
3615 if (bytes_read == 0) {
3616 // tell caller there is no option data and that is ok
3617 FREE_C_HEAP_ARRAY(char, buf);
3618 return JNI_OK;
3619 }
3620
3621 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3622
3623 FREE_C_HEAP_ARRAY(char, buf);
3624 return retcode;
3625 }
3626
3627 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3628 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3629
3630 // some pointers to help with parsing
3631 char *buffer_end = buffer + buf_len;
3632 char *opt_hd = buffer;
3633 char *wrt = buffer;
3634 char *rd = buffer;
3635
3636 // parse all options
3637 while (rd < buffer_end) {
3638 // skip leading white space from the input string
3639 while (rd < buffer_end && isspace(*rd)) {
3640 rd++;
3641 }
3642
3643 if (rd >= buffer_end) {
3644 break;
3645 }
3646
3647 // Remember this is where we found the head of the token.
3648 opt_hd = wrt;
3649
3650 // Tokens are strings of non white space characters separated
3651 // by one or more white spaces.
3652 while (rd < buffer_end && !isspace(*rd)) {
3653 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3654 int quote = *rd; // matching quote to look for
3655 rd++; // don't copy open quote
3656 while (rd < buffer_end && *rd != quote) {
3657 // include everything (even spaces)
3658 // up until the close quote
3659 *wrt++ = *rd++; // copy to option string
3660 }
3661
3662 if (rd < buffer_end) {
3663 rd++; // don't copy close quote
3664 } else {
3665 // did not see closing quote
3666 jio_fprintf(defaultStream::error_stream(),
3667 "Unmatched quote in %s\n", name);
3668 delete options;
3669 return JNI_ERR;
3670 }
3671 } else {
3672 *wrt++ = *rd++; // copy to option string
3673 }
3674 }
3675
3676 // steal a white space character and set it to NULL
3677 *wrt++ = '\0';
3678 // We now have a complete token
3679
3680 JavaVMOption option;
3681 option.optionString = opt_hd;
3682 option.extraInfo = NULL;
3683
3684 options->append(option); // Fill in option
3685
3686 rd++; // Advance to next character
3687 }
3688
3689 // Fill out JavaVMInitArgs structure.
3690 jint status = vm_args->set_args(options);
3691
3692 delete options;
3693 return status;
3694 }
3695
3696 void Arguments::set_shared_spaces_flags() {
3697 if (DumpSharedSpaces) {
3698 if (FailOverToOldVerifier) {
3699 // Don't fall back to the old verifier on verification failure. If a
3700 // class fails verification with the split verifier, it might fail the
3701 // CDS runtime verifier constraint check. In that case, we don't want
3702 // to share the class. We only archive classes that pass the split verifier.
3703 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3704 }
3705
3706 if (RequireSharedSpaces) {
3707 warning("Cannot dump shared archive while using shared archive");
3708 }
3709 UseSharedSpaces = false;
3710 #ifdef _LP64
3711 if (!UseCompressedOops || !UseCompressedClassPointers) {
3712 vm_exit_during_initialization(
3713 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3714 }
3715 } else {
3716 if (!UseCompressedOops || !UseCompressedClassPointers) {
3717 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3718 }
3719 #endif
3720 }
3721 }
3722
3723 // Sharing support
3724 // Construct the path to the archive
3725 static char* get_shared_archive_path() {
3726 char *shared_archive_path;
3727 if (SharedArchiveFile == NULL) {
3728 char jvm_path[JVM_MAXPATHLEN];
3729 os::jvm_path(jvm_path, sizeof(jvm_path));
3730 char *end = strrchr(jvm_path, *os::file_separator());
3731 if (end != NULL) *end = '\0';
3732 size_t jvm_path_len = strlen(jvm_path);
3733 size_t file_sep_len = strlen(os::file_separator());
3734 const size_t len = jvm_path_len + file_sep_len + 20;
3735 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3736 if (shared_archive_path != NULL) {
3737 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3738 jvm_path, os::file_separator());
3739 }
3740 } else {
3741 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3742 }
3743 return shared_archive_path;
3744 }
3745
3746 #ifndef PRODUCT
3747 // Determine whether LogVMOutput should be implicitly turned on.
3748 static bool use_vm_log() {
3749 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3750 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3751 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3752 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3753 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3754 return true;
3755 }
3756
3757 #ifdef COMPILER1
3758 if (PrintC1Statistics) {
3759 return true;
3760 }
3761 #endif // COMPILER1
3762
3763 #ifdef COMPILER2
3764 if (PrintOptoAssembly || PrintOptoStatistics) {
3765 return true;
3766 }
3767 #endif // COMPILER2
3768
3769 return false;
3770 }
3771
3772 #endif // PRODUCT
3773
3774 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3775 for (int index = 0; index < args->nOptions; index++) {
3776 const JavaVMOption* option = args->options + index;
3777 const char* tail;
3778 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3779 return true;
3780 }
3781 }
3782 return false;
3783 }
3784
3785 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3786 const char* vm_options_file,
3787 const int vm_options_file_pos,
3788 ScopedVMInitArgs* vm_options_file_args,
3789 ScopedVMInitArgs* args_out) {
3790 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3791 if (code != JNI_OK) {
3792 return code;
3793 }
3794
3795 if (vm_options_file_args->get()->nOptions < 1) {
3796 return JNI_OK;
3797 }
3798
3799 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3800 jio_fprintf(defaultStream::error_stream(),
3801 "A VM options file may not refer to a VM options file. "
3802 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3803 "options file '%s' in options container '%s' is an error.\n",
3804 vm_options_file_args->vm_options_file_arg(),
3805 vm_options_file_args->container_name());
3806 return JNI_EINVAL;
3807 }
3808
3809 return args_out->insert(args, vm_options_file_args->get(),
3810 vm_options_file_pos);
3811 }
3812
3813 // Expand -XX:VMOptionsFile found in args_in as needed.
3814 // mod_args and args_out parameters may return values as needed.
3815 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3816 ScopedVMInitArgs* mod_args,
3817 JavaVMInitArgs** args_out) {
3818 jint code = match_special_option_and_act(args_in, mod_args);
3819 if (code != JNI_OK) {
3820 return code;
3821 }
3822
3823 if (mod_args->is_set()) {
3824 // args_in contains -XX:VMOptionsFile and mod_args contains the
3825 // original options from args_in along with the options expanded
3826 // from the VMOptionsFile. Return a short-hand to the caller.
3827 *args_out = mod_args->get();
3828 } else {
3829 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3830 }
3831 return JNI_OK;
3832 }
3833
3834 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3835 ScopedVMInitArgs* args_out) {
3836 // Remaining part of option string
3837 const char* tail;
3838 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3839
3840 for (int index = 0; index < args->nOptions; index++) {
3841 const JavaVMOption* option = args->options + index;
3842 if (ArgumentsExt::process_options(option)) {
3843 continue;
3844 }
3845 if (match_option(option, "-XX:Flags=", &tail)) {
3846 Arguments::set_jvm_flags_file(tail);
3847 continue;
3848 }
3849 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3850 if (vm_options_file_args.found_vm_options_file_arg()) {
3851 jio_fprintf(defaultStream::error_stream(),
3852 "The option '%s' is already specified in the options "
3853 "container '%s' so the specification of '%s' in the "
3854 "same options container is an error.\n",
3855 vm_options_file_args.vm_options_file_arg(),
3856 vm_options_file_args.container_name(),
3857 option->optionString);
3858 return JNI_EINVAL;
3859 }
3860 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3861 // If there's a VMOptionsFile, parse that
3862 jint code = insert_vm_options_file(args, tail, index,
3863 &vm_options_file_args, args_out);
3864 if (code != JNI_OK) {
3865 return code;
3866 }
3867 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3868 if (args_out->is_set()) {
3869 // The VMOptions file inserted some options so switch 'args'
3870 // to the new set of options, and continue processing which
3871 // preserves "last option wins" semantics.
3872 args = args_out->get();
3873 // The first option from the VMOptionsFile replaces the
3874 // current option. So we back track to process the
3875 // replacement option.
3876 index--;
3877 }
3878 continue;
3879 }
3880 if (match_option(option, "-XX:+PrintVMOptions")) {
3881 PrintVMOptions = true;
3882 continue;
3883 }
3884 if (match_option(option, "-XX:-PrintVMOptions")) {
3885 PrintVMOptions = false;
3886 continue;
3887 }
3888 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3889 IgnoreUnrecognizedVMOptions = true;
3890 continue;
3891 }
3892 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3893 IgnoreUnrecognizedVMOptions = false;
3894 continue;
3895 }
3896 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3897 CommandLineFlags::printFlags(tty, false);
3898 vm_exit(0);
3899 }
3900 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3901 #if INCLUDE_NMT
3902 // The launcher did not setup nmt environment variable properly.
3903 if (!MemTracker::check_launcher_nmt_support(tail)) {
3904 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3905 }
3906
3907 // Verify if nmt option is valid.
3908 if (MemTracker::verify_nmt_option()) {
3909 // Late initialization, still in single-threaded mode.
3910 if (MemTracker::tracking_level() >= NMT_summary) {
3911 MemTracker::init();
3912 }
3913 } else {
3914 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3915 }
3916 continue;
3917 #else
3918 jio_fprintf(defaultStream::error_stream(),
3919 "Native Memory Tracking is not supported in this VM\n");
3920 return JNI_ERR;
3921 #endif
3922 }
3923
3924 #ifndef PRODUCT
3925 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3926 CommandLineFlags::printFlags(tty, true);
3927 vm_exit(0);
3928 }
3929 #endif
3930
3931 if (match_option(option, "-XX:+UseAppCDS")) {
3932 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
3933 if (flag->is_diagnostic()) {
3934 flag->clear_diagnostic();
3935 }
3936 continue;
3937 }
3938 }
3939 return JNI_OK;
3940 }
3941
3942 static void print_options(const JavaVMInitArgs *args) {
3943 const char* tail;
3944 for (int index = 0; index < args->nOptions; index++) {
3945 const JavaVMOption *option = args->options + index;
3946 if (match_option(option, "-XX:", &tail)) {
3947 logOption(tail);
3948 }
3949 }
3950 }
3951
3952 bool Arguments::handle_deprecated_print_gc_flags() {
3953 if (PrintGC) {
3954 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3955 }
3956 if (PrintGCDetails) {
3957 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3958 }
3959
3960 if (_gc_log_filename != NULL) {
3961 // -Xloggc was used to specify a filename
3962 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3963
3964 LogTarget(Error, logging) target;
3965 LogStream errstream(target);
3966 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3967 } else if (PrintGC || PrintGCDetails) {
3968 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3969 }
3970 return true;
3971 }
3972
3973 void Arguments::handle_extra_cms_flags(const char* msg) {
3974 SpecialFlag flag;
3975 const char *flag_name = "UseConcMarkSweepGC";
3976 if (lookup_special_flag(flag_name, flag)) {
3977 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3978 warning("%s", msg);
3979 }
3980 }
3981
3982 // Parse entry point called from JNI_CreateJavaVM
3983
3984 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3985 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3986
3987 // Initialize ranges, constraints and writeables
3988 CommandLineFlagRangeList::init();
3989 CommandLineFlagConstraintList::init();
3990 CommandLineFlagWriteableList::init();
3991
3992 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3993 const char* hotspotrc = ".hotspotrc";
3994 bool settings_file_specified = false;
3995 bool needs_hotspotrc_warning = false;
3996 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3997 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3998
3999 // Pointers to current working set of containers
4000 JavaVMInitArgs* cur_cmd_args;
4001 JavaVMInitArgs* cur_java_options_args;
4002 JavaVMInitArgs* cur_java_tool_options_args;
4003
4004 // Containers for modified/expanded options
4005 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4006 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4007 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4008
4009
4010 jint code =
4011 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4012 if (code != JNI_OK) {
4013 return code;
4014 }
4015
4016 code = parse_java_options_environment_variable(&initial_java_options_args);
4017 if (code != JNI_OK) {
4018 return code;
4019 }
4020
4021 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4022 &mod_java_tool_options_args,
4023 &cur_java_tool_options_args);
4024 if (code != JNI_OK) {
4025 return code;
4026 }
4027
4028 code = expand_vm_options_as_needed(initial_cmd_args,
4029 &mod_cmd_args,
4030 &cur_cmd_args);
4031 if (code != JNI_OK) {
4032 return code;
4033 }
4034
4035 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4036 &mod_java_options_args,
4037 &cur_java_options_args);
4038 if (code != JNI_OK) {
4039 return code;
4040 }
4041
4042 const char* flags_file = Arguments::get_jvm_flags_file();
4043 settings_file_specified = (flags_file != NULL);
4044
4045 if (IgnoreUnrecognizedVMOptions) {
4046 cur_cmd_args->ignoreUnrecognized = true;
4047 cur_java_tool_options_args->ignoreUnrecognized = true;
4048 cur_java_options_args->ignoreUnrecognized = true;
4049 }
4050
4051 // Parse specified settings file
4052 if (settings_file_specified) {
4053 if (!process_settings_file(flags_file, true,
4054 cur_cmd_args->ignoreUnrecognized)) {
4055 return JNI_EINVAL;
4056 }
4057 } else {
4058 #ifdef ASSERT
4059 // Parse default .hotspotrc settings file
4060 if (!process_settings_file(".hotspotrc", false,
4061 cur_cmd_args->ignoreUnrecognized)) {
4062 return JNI_EINVAL;
4063 }
4064 #else
4065 struct stat buf;
4066 if (os::stat(hotspotrc, &buf) == 0) {
4067 needs_hotspotrc_warning = true;
4068 }
4069 #endif
4070 }
4071
4072 if (PrintVMOptions) {
4073 print_options(cur_java_tool_options_args);
4074 print_options(cur_cmd_args);
4075 print_options(cur_java_options_args);
4076 }
4077
4078 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4079 jint result = parse_vm_init_args(cur_java_tool_options_args,
4080 cur_java_options_args,
4081 cur_cmd_args);
4082
4083 if (result != JNI_OK) {
4084 return result;
4085 }
4086
4087 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4088 SharedArchivePath = get_shared_archive_path();
4089 if (SharedArchivePath == NULL) {
4090 return JNI_ENOMEM;
4091 }
4092
4093 // Set up VerifySharedSpaces
4094 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4095 VerifySharedSpaces = true;
4096 }
4097
4098 // Delay warning until here so that we've had a chance to process
4099 // the -XX:-PrintWarnings flag
4100 if (needs_hotspotrc_warning) {
4101 warning("%s file is present but has been ignored. "
4102 "Run with -XX:Flags=%s to load the file.",
4103 hotspotrc, hotspotrc);
4104 }
4105
4106 if (needs_module_property_warning) {
4107 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4108 " names that are reserved for internal use.");
4109 }
4110
4111 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4112 UNSUPPORTED_OPTION(UseLargePages);
4113 #endif
4114
4115 ArgumentsExt::report_unsupported_options();
4116
4117 #ifndef PRODUCT
4118 if (TraceBytecodesAt != 0) {
4119 TraceBytecodes = true;
4120 }
4121 if (CountCompiledCalls) {
4122 if (UseCounterDecay) {
4123 warning("UseCounterDecay disabled because CountCalls is set");
4124 UseCounterDecay = false;
4125 }
4126 }
4127 #endif // PRODUCT
4128
4129 if (ScavengeRootsInCode == 0) {
4130 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4131 warning("Forcing ScavengeRootsInCode non-zero");
4132 }
4133 ScavengeRootsInCode = 1;
4134 }
4135
4136 if (!handle_deprecated_print_gc_flags()) {
4137 return JNI_EINVAL;
4138 }
4139
4140 // Set object alignment values.
4141 set_object_alignment();
4142
4143 #if !INCLUDE_CDS
4144 if (DumpSharedSpaces || RequireSharedSpaces) {
4145 jio_fprintf(defaultStream::error_stream(),
4146 "Shared spaces are not supported in this VM\n");
4147 return JNI_ERR;
4148 }
4149 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4150 log_is_enabled(Info, cds)) {
4151 warning("Shared spaces are not supported in this VM");
4152 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4153 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4154 }
4155 no_shared_spaces("CDS Disabled");
4156 #endif // INCLUDE_CDS
4157
4158 return JNI_OK;
4159 }
4160
4161 jint Arguments::apply_ergo() {
4162 // Set flags based on ergonomics.
4163 jint result = set_ergonomics_flags();
4164 if (result != JNI_OK) return result;
4165
4166 #if INCLUDE_JVMCI
4167 set_jvmci_specific_flags();
4168 #endif
4169
4170 set_shared_spaces_flags();
4171
4172 if (TieredCompilation) {
4173 set_tiered_flags();
4174 } else {
4175 int max_compilation_policy_choice = 1;
4176 #ifdef COMPILER2
4177 if (is_server_compilation_mode_vm()) {
4178 max_compilation_policy_choice = 2;
4179 }
4180 #endif
4181 // Check if the policy is valid.
4182 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4183 vm_exit_during_initialization(
4184 "Incompatible compilation policy selected", NULL);
4185 }
4186 // Scale CompileThreshold
4187 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4188 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4189 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4190 }
4191 }
4192
4193 #ifdef COMPILER2
4194 #ifndef PRODUCT
4195 if (PrintIdealGraphLevel > 0) {
4196 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4197 }
4198 #endif
4199 #endif
4200
4201 // Set heap size based on available physical memory
4202 set_heap_size();
4203
4204 GCConfig::arguments()->initialize();
4205
4206 // Initialize Metaspace flags and alignments
4207 Metaspace::ergo_initialize();
4208
4209 // Set bytecode rewriting flags
4210 set_bytecode_flags();
4211
4212 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4213 jint code = set_aggressive_opts_flags();
4214 if (code != JNI_OK) {
4215 return code;
4216 }
4217
4218 // Turn off biased locking for locking debug mode flags,
4219 // which are subtly different from each other but neither works with
4220 // biased locking
4221 if (UseHeavyMonitors
4222 #ifdef COMPILER1
4223 || !UseFastLocking
4224 #endif // COMPILER1
4225 #if INCLUDE_JVMCI
4226 || !JVMCIUseFastLocking
4227 #endif
4228 ) {
4229 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4230 // flag set to true on command line; warn the user that they
4231 // can't enable biased locking here
4232 warning("Biased Locking is not supported with locking debug flags"
4233 "; ignoring UseBiasedLocking flag." );
4234 }
4235 UseBiasedLocking = false;
4236 }
4237
4238 #ifdef CC_INTERP
4239 // Clear flags not supported on zero.
4240 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4241 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4242 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4243 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4244 #endif // CC_INTERP
4245
4246 #ifdef COMPILER2
4247 if (!EliminateLocks) {
4248 EliminateNestedLocks = false;
4249 }
4250 if (!Inline) {
4251 IncrementalInline = false;
4252 }
4253 #ifndef PRODUCT
4254 if (!IncrementalInline) {
4255 AlwaysIncrementalInline = false;
4256 }
4257 #endif
4258 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4259 // nothing to use the profiling, turn if off
4260 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4261 }
4262 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
4263 // blind guess
4264 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
4265 }
4266 #endif
4267
4268 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4269 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4270 DebugNonSafepoints = true;
4271 }
4272
4273 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4274 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4275 }
4276
4277 if (UseOnStackReplacement && !UseLoopCounter) {
4278 warning("On-stack-replacement requires loop counters; enabling loop counters");
4279 FLAG_SET_DEFAULT(UseLoopCounter, true);
4280 }
4281
4282 #ifndef PRODUCT
4283 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4284 if (use_vm_log()) {
4285 LogVMOutput = true;
4286 }
4287 }
4288 #endif // PRODUCT
4289
4290 if (PrintCommandLineFlags) {
4291 CommandLineFlags::printSetFlags(tty);
4292 }
4293
4294 // Apply CPU specific policy for the BiasedLocking
4295 if (UseBiasedLocking) {
4296 if (!VM_Version::use_biased_locking() &&
4297 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4298 UseBiasedLocking = false;
4299 }
4300 }
4301 #ifdef COMPILER2
4302 if (!UseBiasedLocking || EmitSync != 0) {
4303 UseOptoBiasInlining = false;
4304 }
4305 #endif
4306
4307 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4308 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4309 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4310 } else {
4311 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4312 }
4313
4314 return JNI_OK;
4315 }
4316
4317 jint Arguments::adjust_after_os() {
4318 if (UseNUMA) {
4319 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4320 FLAG_SET_ERGO(bool, UseNUMA, false);
4321 } else if (UseParallelGC || UseParallelOldGC) {
4322 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4323 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4324 }
4325 }
4326 // UseNUMAInterleaving is set to ON for all collectors and
4327 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4328 // such as the parallel collector for Linux and Solaris will
4329 // interleave old gen and survivor spaces on top of NUMA
4330 // allocation policy for the eden space.
4331 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4332 // all platforms and ParallelGC on Windows will interleave all
4333 // of the heap spaces across NUMA nodes.
4334 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4335 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4336 }
4337 }
4338 return JNI_OK;
4339 }
4340
4341 int Arguments::PropertyList_count(SystemProperty* pl) {
4342 int count = 0;
4343 while(pl != NULL) {
4344 count++;
4345 pl = pl->next();
4346 }
4347 return count;
4348 }
4349
4350 // Return the number of readable properties.
4351 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4352 int count = 0;
4353 while(pl != NULL) {
4354 if (pl->is_readable()) {
4355 count++;
4356 }
4357 pl = pl->next();
4358 }
4359 return count;
4360 }
4361
4362 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4363 assert(key != NULL, "just checking");
4364 SystemProperty* prop;
4365 for (prop = pl; prop != NULL; prop = prop->next()) {
4366 if (strcmp(key, prop->key()) == 0) return prop->value();
4367 }
4368 return NULL;
4369 }
4370
4371 // Return the value of the requested property provided that it is a readable property.
4372 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4373 assert(key != NULL, "just checking");
4374 SystemProperty* prop;
4375 // Return the property value if the keys match and the property is not internal or
4376 // it's the special internal property "jdk.boot.class.path.append".
4377 for (prop = pl; prop != NULL; prop = prop->next()) {
4378 if (strcmp(key, prop->key()) == 0) {
4379 if (!prop->internal()) {
4380 return prop->value();
4381 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4382 return prop->value();
4383 } else {
4384 // Property is internal and not jdk.boot.class.path.append so return NULL.
4385 return NULL;
4386 }
4387 }
4388 }
4389 return NULL;
4390 }
4391
4392 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4393 int count = 0;
4394 const char* ret_val = NULL;
4395
4396 while(pl != NULL) {
4397 if(count >= index) {
4398 ret_val = pl->key();
4399 break;
4400 }
4401 count++;
4402 pl = pl->next();
4403 }
4404
4405 return ret_val;
4406 }
4407
4408 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4409 int count = 0;
4410 char* ret_val = NULL;
4411
4412 while(pl != NULL) {
4413 if(count >= index) {
4414 ret_val = pl->value();
4415 break;
4416 }
4417 count++;
4418 pl = pl->next();
4419 }
4420
4421 return ret_val;
4422 }
4423
4424 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4425 SystemProperty* p = *plist;
4426 if (p == NULL) {
4427 *plist = new_p;
4428 } else {
4429 while (p->next() != NULL) {
4430 p = p->next();
4431 }
4432 p->set_next(new_p);
4433 }
4434 }
4435
4436 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4437 bool writeable, bool internal) {
4438 if (plist == NULL)
4439 return;
4440
4441 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4442 PropertyList_add(plist, new_p);
4443 }
4444
4445 void Arguments::PropertyList_add(SystemProperty *element) {
4446 PropertyList_add(&_system_properties, element);
4447 }
4448
4449 // This add maintains unique property key in the list.
4450 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4451 PropertyAppendable append, PropertyWriteable writeable,
4452 PropertyInternal internal) {
4453 if (plist == NULL)
4454 return;
4455
4456 // If property key exist then update with new value.
4457 SystemProperty* prop;
4458 for (prop = *plist; prop != NULL; prop = prop->next()) {
4459 if (strcmp(k, prop->key()) == 0) {
4460 if (append == AppendProperty) {
4461 prop->append_value(v);
4462 } else {
4463 prop->set_value(v);
4464 }
4465 return;
4466 }
4467 }
4468
4469 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4470 }
4471
4472 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4473 // Returns true if all of the source pointed by src has been copied over to
4474 // the destination buffer pointed by buf. Otherwise, returns false.
4475 // Notes:
4476 // 1. If the length (buflen) of the destination buffer excluding the
4477 // NULL terminator character is not long enough for holding the expanded
4478 // pid characters, it also returns false instead of returning the partially
4479 // expanded one.
4480 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4481 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4482 char* buf, size_t buflen) {
4483 const char* p = src;
4484 char* b = buf;
4485 const char* src_end = &src[srclen];
4486 char* buf_end = &buf[buflen - 1];
4487
4488 while (p < src_end && b < buf_end) {
4489 if (*p == '%') {
4490 switch (*(++p)) {
4491 case '%': // "%%" ==> "%"
4492 *b++ = *p++;
4493 break;
4494 case 'p': { // "%p" ==> current process id
4495 // buf_end points to the character before the last character so
4496 // that we could write '\0' to the end of the buffer.
4497 size_t buf_sz = buf_end - b + 1;
4498 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4499
4500 // if jio_snprintf fails or the buffer is not long enough to hold
4501 // the expanded pid, returns false.
4502 if (ret < 0 || ret >= (int)buf_sz) {
4503 return false;
4504 } else {
4505 b += ret;
4506 assert(*b == '\0', "fail in copy_expand_pid");
4507 if (p == src_end && b == buf_end + 1) {
4508 // reach the end of the buffer.
4509 return true;
4510 }
4511 }
4512 p++;
4513 break;
4514 }
4515 default :
4516 *b++ = '%';
4517 }
4518 } else {
4519 *b++ = *p++;
4520 }
4521 }
4522 *b = '\0';
4523 return (p == src_end); // return false if not all of the source was copied
4524 }