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/collectorPolicy.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/commandLineFlagConstraintList.hpp"
46 #include "runtime/commandLineFlagWriteableList.hpp"
47 #include "runtime/commandLineFlagRangeList.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.inline.hpp"
52 #include "runtime/safepoint.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64
65 // Note: This is a special bug reporting site for the JVM
66 #ifdef VENDOR_URL_VM_BUG
67 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
68 #else
69 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #endif
71 #define DEFAULT_JAVA_LAUNCHER "generic"
72
73 char* Arguments::_jvm_flags_file = NULL;
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 size_t Arguments::_conservative_max_heap_alignment = 0;
82 size_t Arguments::_min_heap_size = 0;
83 Arguments::Mode Arguments::_mode = _mixed;
84 bool Arguments::_java_compiler = false;
85 bool Arguments::_xdebug_mode = false;
86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
88 int Arguments::_sun_java_launcher_pid = -1;
89 bool Arguments::_sun_java_launcher_is_altjvm = false;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 bool Arguments::_enable_preview = false;
100
101 char* Arguments::SharedArchivePath = NULL;
102
103 AgentLibraryList Arguments::_libraryList;
104 AgentLibraryList Arguments::_agentList;
105
106 abort_hook_t Arguments::_abort_hook = NULL;
107 exit_hook_t Arguments::_exit_hook = NULL;
108 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
109
110
111 SystemProperty *Arguments::_sun_boot_library_path = NULL;
112 SystemProperty *Arguments::_java_library_path = NULL;
113 SystemProperty *Arguments::_java_home = NULL;
114 SystemProperty *Arguments::_java_class_path = NULL;
115 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
116
117 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
118 PathString *Arguments::_system_boot_class_path = NULL;
119 bool Arguments::_has_jimage = false;
120
121 char* Arguments::_ext_dirs = NULL;
122
123 bool PathString::set_value(const char *value) {
124 if (_value != NULL) {
125 FreeHeap(_value);
126 }
127 _value = AllocateHeap(strlen(value)+1, mtArguments);
128 assert(_value != NULL, "Unable to allocate space for new path value");
129 if (_value != NULL) {
130 strcpy(_value, value);
131 } else {
132 // not able to allocate
133 return false;
134 }
135 return true;
136 }
137
138 void PathString::append_value(const char *value) {
139 char *sp;
140 size_t len = 0;
141 if (value != NULL) {
142 len = strlen(value);
143 if (_value != NULL) {
144 len += strlen(_value);
145 }
146 sp = AllocateHeap(len+2, mtArguments);
147 assert(sp != NULL, "Unable to allocate space for new append path value");
148 if (sp != NULL) {
149 if (_value != NULL) {
150 strcpy(sp, _value);
151 strcat(sp, os::path_separator());
152 strcat(sp, value);
153 FreeHeap(_value);
154 } else {
155 strcpy(sp, value);
156 }
157 _value = sp;
158 }
159 }
160 }
161
162 PathString::PathString(const char* value) {
163 if (value == NULL) {
164 _value = NULL;
165 } else {
166 _value = AllocateHeap(strlen(value)+1, mtArguments);
167 strcpy(_value, value);
168 }
169 }
170
171 PathString::~PathString() {
172 if (_value != NULL) {
173 FreeHeap(_value);
174 _value = NULL;
175 }
176 }
177
178 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
179 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
180 size_t len = strlen(module_name) + 1;
181 _module_name = AllocateHeap(len, mtInternal);
182 strncpy(_module_name, module_name, len); // copy the trailing null
183 _path = new PathString(path);
184 }
185
186 ModulePatchPath::~ModulePatchPath() {
187 if (_module_name != NULL) {
188 FreeHeap(_module_name);
189 _module_name = NULL;
190 }
191 if (_path != NULL) {
192 delete _path;
193 _path = NULL;
194 }
195 }
196
197 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
198 if (key == NULL) {
199 _key = NULL;
200 } else {
201 _key = AllocateHeap(strlen(key)+1, mtArguments);
202 strcpy(_key, key);
203 }
204 _next = NULL;
205 _internal = internal;
206 _writeable = writeable;
207 }
208
209 AgentLibrary::AgentLibrary(const char* name, const char* options,
210 bool is_absolute_path, void* os_lib,
211 bool instrument_lib) {
212 _name = AllocateHeap(strlen(name)+1, mtArguments);
213 strcpy(_name, name);
214 if (options == NULL) {
215 _options = NULL;
216 } else {
217 _options = AllocateHeap(strlen(options)+1, mtArguments);
218 strcpy(_options, options);
219 }
220 _is_absolute_path = is_absolute_path;
221 _os_lib = os_lib;
222 _next = NULL;
223 _state = agent_invalid;
224 _is_static_lib = false;
225 _is_instrument_lib = instrument_lib;
226 }
227
228 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
229 // part of the option string.
230 static bool match_option(const JavaVMOption *option, const char* name,
231 const char** tail) {
232 size_t len = strlen(name);
233 if (strncmp(option->optionString, name, len) == 0) {
234 *tail = option->optionString + len;
235 return true;
236 } else {
237 return false;
238 }
239 }
240
241 // Check if 'option' matches 'name'. No "tail" is allowed.
242 static bool match_option(const JavaVMOption *option, const char* name) {
243 const char* tail = NULL;
244 bool result = match_option(option, name, &tail);
245 if (tail != NULL && *tail == '\0') {
246 return result;
247 } else {
248 return false;
249 }
250 }
251
252 // Return true if any of the strings in null-terminated array 'names' matches.
253 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
254 // the option must match exactly.
255 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
256 bool tail_allowed) {
257 for (/* empty */; *names != NULL; ++names) {
258 if (match_option(option, *names, tail)) {
259 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
260 return true;
261 }
262 }
263 }
264 return false;
265 }
266
267 static void logOption(const char* opt) {
268 if (PrintVMOptions) {
269 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
270 }
271 }
272
273 bool needs_module_property_warning = false;
274
275 #define MODULE_PROPERTY_PREFIX "jdk.module."
276 #define MODULE_PROPERTY_PREFIX_LEN 11
277 #define ADDEXPORTS "addexports"
278 #define ADDEXPORTS_LEN 10
279 #define ADDREADS "addreads"
280 #define ADDREADS_LEN 8
281 #define ADDOPENS "addopens"
282 #define ADDOPENS_LEN 8
283 #define PATCH "patch"
284 #define PATCH_LEN 5
285 #define ADDMODS "addmods"
286 #define ADDMODS_LEN 7
287 #define LIMITMODS "limitmods"
288 #define LIMITMODS_LEN 9
289 #define PATH "path"
290 #define PATH_LEN 4
291 #define UPGRADE_PATH "upgrade.path"
292 #define UPGRADE_PATH_LEN 12
293
294 void Arguments::add_init_library(const char* name, char* options) {
295 _libraryList.add(new AgentLibrary(name, options, false, NULL));
296 }
297
298 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
299 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
300 }
301
302 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
303 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
304 }
305
306 // Late-binding agents not started via arguments
307 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
308 _agentList.add(agentLib);
309 }
310
311 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
312 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
313 }
314
315 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
316 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
317 return ((strncmp(option, property, len) == 0) &&
318 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
319 }
320
321 // Return true if property starts with "jdk.module." and its ensuing chars match
322 // any of the reserved module properties.
323 // property should be passed without the leading "-D".
324 bool Arguments::is_internal_module_property(const char* property) {
325 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
326 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
327 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
328 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
329 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
330 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
331 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
332 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
333 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
334 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
335 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
336 return true;
337 }
338 }
339 return false;
340 }
341
342 // Process java launcher properties.
343 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
344 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
345 // sun.java.launcher.pid is defined.
346 // Must do this before setting up other system properties,
347 // as some of them may depend on launcher type.
348 for (int index = 0; index < args->nOptions; index++) {
349 const JavaVMOption* option = args->options + index;
350 const char* tail;
351
352 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
353 process_java_launcher_argument(tail, option->extraInfo);
354 continue;
355 }
356 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
357 if (strcmp(tail, "true") == 0) {
358 _sun_java_launcher_is_altjvm = true;
359 }
360 continue;
361 }
362 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
363 _sun_java_launcher_pid = atoi(tail);
364 continue;
365 }
366 }
367 }
368
369 // Initialize system properties key and value.
370 void Arguments::init_system_properties() {
371
372 // Set up _system_boot_class_path which is not a property but
373 // relies heavily on argument processing and the jdk.boot.class.path.append
374 // property. It is used to store the underlying system boot class path.
375 _system_boot_class_path = new PathString(NULL);
376
377 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
378 "Java Virtual Machine Specification", false));
379 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
380 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
381 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
382 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
383
384 // Following are JVMTI agent writable properties.
385 // Properties values are set to NULL and they are
386 // os specific they are initialized in os::init_system_properties_values().
387 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
388 _java_library_path = new SystemProperty("java.library.path", NULL, true);
389 _java_home = new SystemProperty("java.home", NULL, true);
390 _java_class_path = new SystemProperty("java.class.path", "", true);
391 // jdk.boot.class.path.append is a non-writeable, internal property.
392 // It can only be set by either:
393 // - -Xbootclasspath/a:
394 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
395 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
396
397 // Add to System Property list.
398 PropertyList_add(&_system_properties, _sun_boot_library_path);
399 PropertyList_add(&_system_properties, _java_library_path);
400 PropertyList_add(&_system_properties, _java_home);
401 PropertyList_add(&_system_properties, _java_class_path);
402 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
403
404 // Set OS specific system properties values
405 os::init_system_properties_values();
406 }
407
408 // Update/Initialize System properties after JDK version number is known
409 void Arguments::init_version_specific_system_properties() {
410 enum { bufsz = 16 };
411 char buffer[bufsz];
412 const char* spec_vendor = "Oracle Corporation";
413 uint32_t spec_version = JDK_Version::current().major_version();
414
415 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
416
417 PropertyList_add(&_system_properties,
418 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
419 PropertyList_add(&_system_properties,
420 new SystemProperty("java.vm.specification.version", buffer, false));
421 PropertyList_add(&_system_properties,
422 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
423 }
424
425 /*
426 * -XX argument processing:
427 *
428 * -XX arguments are defined in several places, such as:
429 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
430 * -XX arguments are parsed in parse_argument().
431 * -XX argument bounds checking is done in check_vm_args_consistency().
432 *
433 * Over time -XX arguments may change. There are mechanisms to handle common cases:
434 *
435 * ALIASED: An option that is simply another name for another option. This is often
436 * part of the process of deprecating a flag, but not all aliases need
437 * to be deprecated.
438 *
439 * Create an alias for an option by adding the old and new option names to the
440 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
441 *
442 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
443 * support may be removed in the future. Both regular and aliased options may be
444 * deprecated.
445 *
446 * Add a deprecation warning for an option (or alias) by adding an entry in the
447 * "special_jvm_flags" table and setting the "deprecated_in" field.
448 * Often an option "deprecated" in one major release will
449 * be made "obsolete" in the next. In this case the entry should also have its
450 * "obsolete_in" field set.
451 *
452 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
453 * on the command line. A warning is printed to let the user know that option might not
454 * be accepted in the future.
455 *
456 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
457 * table and setting the "obsolete_in" field.
458 *
459 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
460 * to the current JDK version. The system will flatly refuse to admit the existence of
461 * the flag. This allows a flag to die automatically over JDK releases.
462 *
463 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
464 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
465 * - Newly obsolete or expired deprecated options should have their global variable
466 * definitions removed (from globals.hpp, etc) and related implementations removed.
467 *
468 * Recommended approach for removing options:
469 *
470 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
471 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
472 *
473 * To remove internal options (e.g. diagnostic, experimental, develop options), use
474 * a 2-step model adding major release numbers to the obsolete and expire columns.
475 *
476 * To change the name of an option, use the alias table as well as a 2-step
477 * model adding major release numbers to the deprecate and expire columns.
478 * Think twice about aliasing commonly used customer options.
479 *
480 * There are times when it is appropriate to leave a future release number as undefined.
481 *
482 * Tests: Aliases should be tested in VMAliasOptions.java.
483 * Deprecated options should be tested in VMDeprecatedOptions.java.
484 */
485
486 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
487 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
488 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
489 // the command-line as usual, but will issue a warning.
490 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
491 // the command-line, while issuing a warning and ignoring the flag value.
492 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
493 // existence of the flag.
494 //
495 // MANUAL CLEANUP ON JDK VERSION UPDATES:
496 // This table ensures that the handling of options will update automatically when the JDK
497 // version is incremented, but the source code needs to be cleanup up manually:
498 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
499 // variable should be removed, as well as users of the variable.
500 // - As "deprecated" options age into "obsolete" options, move the entry into the
501 // "Obsolete Flags" section of the table.
502 // - All expired options should be removed from the table.
503 static SpecialFlag const special_jvm_flags[] = {
504 // -------------- Deprecated Flags --------------
505 // --- Non-alias flags - sorted by obsolete_in then expired_in:
506 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
507 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
508 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
509 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
510 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
511 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
512 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
515 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
516 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
517 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
518 { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
519 { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
520 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
521
522 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
523 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
526 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
527
528 // -------------- Obsolete Flags - sorted by expired_in --------------
529 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
530 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
531 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
532 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
533 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
534 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
535 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
536 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
537 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
538 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
539 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
540 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
541 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
542 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
543 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
544 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
545 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
546 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
547 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
548
549 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
550 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
551 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
552 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
553 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
554 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
555 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
556 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
557 #endif
558
559 { NULL, JDK_Version(0), JDK_Version(0) }
560 };
561
562 // Flags that are aliases for other flags.
563 typedef struct {
564 const char* alias_name;
565 const char* real_name;
566 } AliasedFlag;
567
568 static AliasedFlag const aliased_jvm_flags[] = {
569 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
570 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
571 { NULL, NULL}
572 };
573
574 // NOTE: A compatibility request will be necessary for each alias to be removed.
575 static AliasedLoggingFlag const aliased_logging_flags[] = {
576 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
577 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
578 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
579 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
580 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
581 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
582 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
583 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
584 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
585 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
586 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
587 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
588 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
589 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
590 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
591 };
592
593 #ifndef PRODUCT
594 // These options are removed in jdk9. Remove this code for jdk10.
595 static AliasedFlag const removed_develop_logging_flags[] = {
596 { "TraceClassInitialization", "-Xlog:class+init" },
597 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
598 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
599 { "TraceItables", "-Xlog:itables=debug" },
600 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
601 { "TraceSafepoint", "-Xlog:safepoint=debug" },
602 { "TraceStartupTime", "-Xlog:startuptime" },
603 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
604 { "PrintVtables", "-Xlog:vtables=debug" },
605 { "VerboseVerification", "-Xlog:verification" },
606 { NULL, NULL }
607 };
608 #endif //PRODUCT
609
610 // Return true if "v" is less than "other", where "other" may be "undefined".
611 static bool version_less_than(JDK_Version v, JDK_Version other) {
612 assert(!v.is_undefined(), "must be defined");
613 if (!other.is_undefined() && v.compare(other) >= 0) {
614 return false;
615 } else {
616 return true;
617 }
618 }
619
620 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
621
622 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
623 // Allow extensions to have priority
624 if (lookup_special_flag_ext(flag_name, flag)) {
625 return true;
626 }
627
628 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
629 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
630 flag = special_jvm_flags[i];
631 return true;
632 }
633 }
634 return false;
635 }
636
637 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
638 assert(version != NULL, "Must provide a version buffer");
639 SpecialFlag flag;
640 if (lookup_special_flag(flag_name, flag)) {
641 if (!flag.obsolete_in.is_undefined()) {
642 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
643 *version = flag.obsolete_in;
644 return true;
645 }
646 }
647 }
648 return false;
649 }
650
651 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
652 assert(version != NULL, "Must provide a version buffer");
653 SpecialFlag flag;
654 if (lookup_special_flag(flag_name, flag)) {
655 if (!flag.deprecated_in.is_undefined()) {
656 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
657 version_less_than(JDK_Version::current(), flag.expired_in)) {
658 *version = flag.deprecated_in;
659 return 1;
660 } else {
661 return -1;
662 }
663 }
664 }
665 return 0;
666 }
667
668 #ifndef PRODUCT
669 const char* Arguments::removed_develop_logging_flag_name(const char* name){
670 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
671 const AliasedFlag& flag = removed_develop_logging_flags[i];
672 if (strcmp(flag.alias_name, name) == 0) {
673 return flag.real_name;
674 }
675 }
676 return NULL;
677 }
678 #endif // PRODUCT
679
680 const char* Arguments::real_flag_name(const char *flag_name) {
681 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
682 const AliasedFlag& flag_status = aliased_jvm_flags[i];
683 if (strcmp(flag_status.alias_name, flag_name) == 0) {
684 return flag_status.real_name;
685 }
686 }
687 return flag_name;
688 }
689
690 #ifdef ASSERT
691 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
692 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
693 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
694 return true;
695 }
696 }
697 return false;
698 }
699
700 // Verifies the correctness of the entries in the special_jvm_flags table.
701 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
702 // version being earlier than the deprecation version, then a warning is issued
703 // and verification fails - by returning false. If it is detected that the table
704 // is out of date, with respect to the current version, then a warning is issued
705 // but verification does not fail. This allows the VM to operate when the version
706 // is first updated, without needing to update all the impacted flags at the
707 // same time.
708 static bool verify_special_jvm_flags() {
709 bool success = true;
710 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
711 const SpecialFlag& flag = special_jvm_flags[i];
712 if (lookup_special_flag(flag.name, i)) {
713 warning("Duplicate special flag declaration \"%s\"", flag.name);
714 success = false;
715 }
716 if (flag.deprecated_in.is_undefined() &&
717 flag.obsolete_in.is_undefined()) {
718 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
719 success = false;
720 }
721
722 if (!flag.deprecated_in.is_undefined()) {
723 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
724 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
725 success = false;
726 }
727
728 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
729 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
730 success = false;
731 }
732 }
733
734 if (!flag.obsolete_in.is_undefined()) {
735 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
736 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
737 success = false;
738 }
739
740 // if flag has become obsolete it should not have a "globals" flag defined anymore.
741 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
742 if (Flag::find_flag(flag.name) != NULL) {
743 // Temporarily disable the warning: 8196739
744 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
745 }
746 }
747 }
748
749 if (!flag.expired_in.is_undefined()) {
750 // if flag has become expired it should not have a "globals" flag defined anymore.
751 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
752 if (Flag::find_flag(flag.name) != NULL) {
753 // Temporarily disable the warning: 8196739
754 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
755 }
756 }
757 }
758
759 }
760 return success;
761 }
762 #endif
763
764 // Parses a size specification string.
765 bool Arguments::atojulong(const char *s, julong* result) {
766 julong n = 0;
767
768 // First char must be a digit. Don't allow negative numbers or leading spaces.
769 if (!isdigit(*s)) {
770 return false;
771 }
772
773 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
774 char* remainder;
775 errno = 0;
776 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
777 if (errno != 0) {
778 return false;
779 }
780
781 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
782 if (remainder == s || strlen(remainder) > 1) {
783 return false;
784 }
785
786 switch (*remainder) {
787 case 'T': case 't':
788 *result = n * G * K;
789 // Check for overflow.
790 if (*result/((julong)G * K) != n) return false;
791 return true;
792 case 'G': case 'g':
793 *result = n * G;
794 if (*result/G != n) return false;
795 return true;
796 case 'M': case 'm':
797 *result = n * M;
798 if (*result/M != n) return false;
799 return true;
800 case 'K': case 'k':
801 *result = n * K;
802 if (*result/K != n) return false;
803 return true;
804 case '\0':
805 *result = n;
806 return true;
807 default:
808 return false;
809 }
810 }
811
812 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
813 if (size < min_size) return arg_too_small;
814 if (size > max_size) return arg_too_big;
815 return arg_in_range;
816 }
817
818 // Describe an argument out of range error
819 void Arguments::describe_range_error(ArgsRange errcode) {
820 switch(errcode) {
821 case arg_too_big:
822 jio_fprintf(defaultStream::error_stream(),
823 "The specified size exceeds the maximum "
824 "representable size.\n");
825 break;
826 case arg_too_small:
827 case arg_unreadable:
828 case arg_in_range:
829 // do nothing for now
830 break;
831 default:
832 ShouldNotReachHere();
833 }
834 }
835
836 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
837 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
838 return true;
839 } else {
840 return false;
841 }
842 }
843
844 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
845 char* end;
846 errno = 0;
847 double v = strtod(value, &end);
848 if ((errno != 0) || (*end != 0)) {
849 return false;
850 }
851
852 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
853 return true;
854 }
855 return false;
856 }
857
858 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
859 julong v;
860 int int_v;
861 intx intx_v;
862 bool is_neg = false;
863 Flag* result = Flag::find_flag(name, strlen(name));
864
865 if (result == NULL) {
866 return false;
867 }
868
869 // Check the sign first since atojulong() parses only unsigned values.
870 if (*value == '-') {
871 if (!result->is_intx() && !result->is_int()) {
872 return false;
873 }
874 value++;
875 is_neg = true;
876 }
877 if (!Arguments::atojulong(value, &v)) {
878 return false;
879 }
880 if (result->is_int()) {
881 int_v = (int) v;
882 if (is_neg) {
883 int_v = -int_v;
884 }
885 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
886 } else if (result->is_uint()) {
887 uint uint_v = (uint) v;
888 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
889 } else if (result->is_intx()) {
890 intx_v = (intx) v;
891 if (is_neg) {
892 intx_v = -intx_v;
893 }
894 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
895 } else if (result->is_uintx()) {
896 uintx uintx_v = (uintx) v;
897 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
898 } else if (result->is_uint64_t()) {
899 uint64_t uint64_t_v = (uint64_t) v;
900 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
901 } else if (result->is_size_t()) {
902 size_t size_t_v = (size_t) v;
903 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
904 } else if (result->is_double()) {
905 double double_v = (double) v;
906 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
907 } else {
908 return false;
909 }
910 }
911
912 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
913 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
914 // Contract: CommandLineFlags always returns a pointer that needs freeing.
915 FREE_C_HEAP_ARRAY(char, value);
916 return true;
917 }
918
919 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
920 const char* old_value = "";
921 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
922 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
923 size_t new_len = strlen(new_value);
924 const char* value;
925 char* free_this_too = NULL;
926 if (old_len == 0) {
927 value = new_value;
928 } else if (new_len == 0) {
929 value = old_value;
930 } else {
931 size_t length = old_len + 1 + new_len + 1;
932 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
933 // each new setting adds another LINE to the switch:
934 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
935 value = buf;
936 free_this_too = buf;
937 }
938 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
939 // CommandLineFlags always returns a pointer that needs freeing.
940 FREE_C_HEAP_ARRAY(char, value);
941 if (free_this_too != NULL) {
942 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
943 FREE_C_HEAP_ARRAY(char, free_this_too);
944 }
945 return true;
946 }
947
948 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
949 const char* real_name = real_flag_name(arg);
950 JDK_Version since = JDK_Version();
951 switch (is_deprecated_flag(arg, &since)) {
952 case -1:
953 return NULL; // obsolete or expired, don't process normally
954 case 0:
955 return real_name;
956 case 1: {
957 if (warn) {
958 char version[256];
959 since.to_string(version, sizeof(version));
960 if (real_name != arg) {
961 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
962 arg, version, real_name);
963 } else {
964 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
965 arg, version);
966 }
967 }
968 return real_name;
969 }
970 }
971 ShouldNotReachHere();
972 return NULL;
973 }
974
975 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
976 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
977 // Set tagset string buffer at max size of 256, large enough for any alias tagset
978 const int max_tagset_size = 256;
979 int max_tagset_len = max_tagset_size - 1;
980 char tagset_buffer[max_tagset_size];
981 tagset_buffer[0] = '\0';
982
983 // Write tag-set for aliased logging option, in string list form
984 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
985 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
986 if (i > 0) {
987 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
988 }
989 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
990 }
991 if (!alf.exactMatch) {
992 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
993 }
994 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
995 (on) ? "+" : "-",
996 name,
997 tagset_buffer,
998 (on) ? LogLevel::name(alf.level) : "off");
999 }
1000
1001 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1002 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1003 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1004 if (strcmp(alf.alias_name, name) == 0) {
1005 log_deprecated_flag(name, on, alf);
1006 return alf;
1007 }
1008 }
1009 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1010 return a;
1011 }
1012
1013 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1014
1015 // range of acceptable characters spelled out for portability reasons
1016 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1017 #define BUFLEN 255
1018 char name[BUFLEN+1];
1019 char dummy;
1020 const char* real_name;
1021 bool warn_if_deprecated = true;
1022
1023 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1024 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1025 if (alf.alias_name != NULL){
1026 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1027 return true;
1028 }
1029 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1030 if (real_name == NULL) {
1031 return false;
1032 }
1033 return set_bool_flag(real_name, false, origin);
1034 }
1035 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1036 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1037 if (alf.alias_name != NULL){
1038 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1039 return true;
1040 }
1041 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1042 if (real_name == NULL) {
1043 return false;
1044 }
1045 return set_bool_flag(real_name, true, origin);
1046 }
1047
1048 char punct;
1049 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1050 const char* value = strchr(arg, '=') + 1;
1051 Flag* flag;
1052
1053 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1054 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1055 if (alf.alias_name != NULL) {
1056 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1057 return true;
1058 }
1059 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1060 if (real_name == NULL) {
1061 return false;
1062 }
1063 flag = Flag::find_flag(real_name);
1064 if (flag != NULL && flag->is_ccstr()) {
1065 if (flag->ccstr_accumulates()) {
1066 return append_to_string_flag(real_name, value, origin);
1067 } else {
1068 if (value[0] == '\0') {
1069 value = NULL;
1070 }
1071 return set_string_flag(real_name, value, origin);
1072 }
1073 } else {
1074 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1075 }
1076 }
1077
1078 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1079 const char* value = strchr(arg, '=') + 1;
1080 // -XX:Foo:=xxx will reset the string flag to the given value.
1081 if (value[0] == '\0') {
1082 value = NULL;
1083 }
1084 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1085 if (real_name == NULL) {
1086 return false;
1087 }
1088 return set_string_flag(real_name, value, origin);
1089 }
1090
1091 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1092 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1093 #define NUMBER_RANGE "[0123456789eE+-]"
1094 char value[BUFLEN + 1];
1095 char value2[BUFLEN + 1];
1096 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1097 // Looks like a floating-point number -- try again with more lenient format string
1098 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1099 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1100 if (real_name == NULL) {
1101 return false;
1102 }
1103 return set_fp_numeric_flag(real_name, value, origin);
1104 }
1105 }
1106
1107 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1108 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1109 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1110 if (real_name == NULL) {
1111 return false;
1112 }
1113 return set_numeric_flag(real_name, value, origin);
1114 }
1115
1116 return false;
1117 }
1118
1119 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1120 assert(bldarray != NULL, "illegal argument");
1121
1122 if (arg == NULL) {
1123 return;
1124 }
1125
1126 int new_count = *count + 1;
1127
1128 // expand the array and add arg to the last element
1129 if (*bldarray == NULL) {
1130 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1131 } else {
1132 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1133 }
1134 (*bldarray)[*count] = os::strdup_check_oom(arg);
1135 *count = new_count;
1136 }
1137
1138 void Arguments::build_jvm_args(const char* arg) {
1139 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1140 }
1141
1142 void Arguments::build_jvm_flags(const char* arg) {
1143 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1144 }
1145
1146 // utility function to return a string that concatenates all
1147 // strings in a given char** array
1148 const char* Arguments::build_resource_string(char** args, int count) {
1149 if (args == NULL || count == 0) {
1150 return NULL;
1151 }
1152 size_t length = 0;
1153 for (int i = 0; i < count; i++) {
1154 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1155 }
1156 char* s = NEW_RESOURCE_ARRAY(char, length);
1157 char* dst = s;
1158 for (int j = 0; j < count; j++) {
1159 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1160 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1161 dst += offset;
1162 length -= offset;
1163 }
1164 return (const char*) s;
1165 }
1166
1167 void Arguments::print_on(outputStream* st) {
1168 st->print_cr("VM Arguments:");
1169 if (num_jvm_flags() > 0) {
1170 st->print("jvm_flags: "); print_jvm_flags_on(st);
1171 st->cr();
1172 }
1173 if (num_jvm_args() > 0) {
1174 st->print("jvm_args: "); print_jvm_args_on(st);
1175 st->cr();
1176 }
1177 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1178 if (_java_class_path != NULL) {
1179 char* path = _java_class_path->value();
1180 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1181 }
1182 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1183 }
1184
1185 void Arguments::print_summary_on(outputStream* st) {
1186 // Print the command line. Environment variables that are helpful for
1187 // reproducing the problem are written later in the hs_err file.
1188 // flags are from setting file
1189 if (num_jvm_flags() > 0) {
1190 st->print_raw("Settings File: ");
1191 print_jvm_flags_on(st);
1192 st->cr();
1193 }
1194 // args are the command line and environment variable arguments.
1195 st->print_raw("Command Line: ");
1196 if (num_jvm_args() > 0) {
1197 print_jvm_args_on(st);
1198 }
1199 // this is the classfile and any arguments to the java program
1200 if (java_command() != NULL) {
1201 st->print("%s", java_command());
1202 }
1203 st->cr();
1204 }
1205
1206 void Arguments::print_jvm_flags_on(outputStream* st) {
1207 if (_num_jvm_flags > 0) {
1208 for (int i=0; i < _num_jvm_flags; i++) {
1209 st->print("%s ", _jvm_flags_array[i]);
1210 }
1211 }
1212 }
1213
1214 void Arguments::print_jvm_args_on(outputStream* st) {
1215 if (_num_jvm_args > 0) {
1216 for (int i=0; i < _num_jvm_args; i++) {
1217 st->print("%s ", _jvm_args_array[i]);
1218 }
1219 }
1220 }
1221
1222 bool Arguments::process_argument(const char* arg,
1223 jboolean ignore_unrecognized,
1224 Flag::Flags origin) {
1225 JDK_Version since = JDK_Version();
1226
1227 if (parse_argument(arg, origin)) {
1228 return true;
1229 }
1230
1231 // Determine if the flag has '+', '-', or '=' characters.
1232 bool has_plus_minus = (*arg == '+' || *arg == '-');
1233 const char* const argname = has_plus_minus ? arg + 1 : arg;
1234
1235 size_t arg_len;
1236 const char* equal_sign = strchr(argname, '=');
1237 if (equal_sign == NULL) {
1238 arg_len = strlen(argname);
1239 } else {
1240 arg_len = equal_sign - argname;
1241 }
1242
1243 // Only make the obsolete check for valid arguments.
1244 if (arg_len <= BUFLEN) {
1245 // Construct a string which consists only of the argument name without '+', '-', or '='.
1246 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1247 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1248 if (is_obsolete_flag(stripped_argname, &since)) {
1249 char version[256];
1250 since.to_string(version, sizeof(version));
1251 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1252 return true;
1253 }
1254 #ifndef PRODUCT
1255 else {
1256 const char* replacement;
1257 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1258 log_warning(arguments)("%s has been removed. Please use %s instead.",
1259 stripped_argname,
1260 replacement);
1261 return false;
1262 }
1263 }
1264 #endif //PRODUCT
1265 }
1266
1267 // For locked flags, report a custom error message if available.
1268 // Otherwise, report the standard unrecognized VM option.
1269 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1270 if (found_flag != NULL) {
1271 char locked_message_buf[BUFLEN];
1272 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1273 if (strlen(locked_message_buf) == 0) {
1274 if (found_flag->is_bool() && !has_plus_minus) {
1275 jio_fprintf(defaultStream::error_stream(),
1276 "Missing +/- setting for VM option '%s'\n", argname);
1277 } else if (!found_flag->is_bool() && has_plus_minus) {
1278 jio_fprintf(defaultStream::error_stream(),
1279 "Unexpected +/- setting in VM option '%s'\n", argname);
1280 } else {
1281 jio_fprintf(defaultStream::error_stream(),
1282 "Improperly specified VM option '%s'\n", argname);
1283 }
1284 } else {
1285 #ifdef PRODUCT
1286 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1287 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1288 if (ignore_unrecognized && mismatched) {
1289 return true;
1290 }
1291 #endif
1292 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1293 }
1294 } else {
1295 if (ignore_unrecognized) {
1296 return true;
1297 }
1298 jio_fprintf(defaultStream::error_stream(),
1299 "Unrecognized VM option '%s'\n", argname);
1300 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1301 if (fuzzy_matched != NULL) {
1302 jio_fprintf(defaultStream::error_stream(),
1303 "Did you mean '%s%s%s'? ",
1304 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1305 fuzzy_matched->_name,
1306 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1307 }
1308 }
1309
1310 // allow for commandline "commenting out" options like -XX:#+Verbose
1311 return arg[0] == '#';
1312 }
1313
1314 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1315 FILE* stream = fopen(file_name, "rb");
1316 if (stream == NULL) {
1317 if (should_exist) {
1318 jio_fprintf(defaultStream::error_stream(),
1319 "Could not open settings file %s\n", file_name);
1320 return false;
1321 } else {
1322 return true;
1323 }
1324 }
1325
1326 char token[1024];
1327 int pos = 0;
1328
1329 bool in_white_space = true;
1330 bool in_comment = false;
1331 bool in_quote = false;
1332 char quote_c = 0;
1333 bool result = true;
1334
1335 int c = getc(stream);
1336 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1337 if (in_white_space) {
1338 if (in_comment) {
1339 if (c == '\n') in_comment = false;
1340 } else {
1341 if (c == '#') in_comment = true;
1342 else if (!isspace(c)) {
1343 in_white_space = false;
1344 token[pos++] = c;
1345 }
1346 }
1347 } else {
1348 if (c == '\n' || (!in_quote && isspace(c))) {
1349 // token ends at newline, or at unquoted whitespace
1350 // this allows a way to include spaces in string-valued options
1351 token[pos] = '\0';
1352 logOption(token);
1353 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1354 build_jvm_flags(token);
1355 pos = 0;
1356 in_white_space = true;
1357 in_quote = false;
1358 } else if (!in_quote && (c == '\'' || c == '"')) {
1359 in_quote = true;
1360 quote_c = c;
1361 } else if (in_quote && (c == quote_c)) {
1362 in_quote = false;
1363 } else {
1364 token[pos++] = c;
1365 }
1366 }
1367 c = getc(stream);
1368 }
1369 if (pos > 0) {
1370 token[pos] = '\0';
1371 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1372 build_jvm_flags(token);
1373 }
1374 fclose(stream);
1375 return result;
1376 }
1377
1378 //=============================================================================================================
1379 // Parsing of properties (-D)
1380
1381 const char* Arguments::get_property(const char* key) {
1382 return PropertyList_get_value(system_properties(), key);
1383 }
1384
1385 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1386 const char* eq = strchr(prop, '=');
1387 const char* key;
1388 const char* value = "";
1389
1390 if (eq == NULL) {
1391 // property doesn't have a value, thus use passed string
1392 key = prop;
1393 } else {
1394 // property have a value, thus extract it and save to the
1395 // allocated string
1396 size_t key_len = eq - prop;
1397 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1398
1399 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1400 key = tmp_key;
1401
1402 value = &prop[key_len + 1];
1403 }
1404
1405 if (strcmp(key, "java.compiler") == 0) {
1406 process_java_compiler_argument(value);
1407 // Record value in Arguments, but let it get passed to Java.
1408 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1409 strcmp(key, "sun.java.launcher.pid") == 0) {
1410 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1411 // private and are processed in process_sun_java_launcher_properties();
1412 // the sun.java.launcher property is passed on to the java application
1413 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1414 // append is true, writable is true, internal is false
1415 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1416 WriteableProperty, ExternalProperty);
1417 } else {
1418 if (strcmp(key, "sun.java.command") == 0) {
1419 char *old_java_command = _java_command;
1420 _java_command = os::strdup_check_oom(value, mtArguments);
1421 if (old_java_command != NULL) {
1422 os::free(old_java_command);
1423 }
1424 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1425 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1426 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1427 // its value without going through the property list or making a Java call.
1428 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1429 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1430 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1431 os::free((void *)old_java_vendor_url_bug);
1432 }
1433 }
1434
1435 // Create new property and add at the end of the list
1436 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1437 }
1438
1439 if (key != prop) {
1440 // SystemProperty copy passed value, thus free previously allocated
1441 // memory
1442 FreeHeap((void *)key);
1443 }
1444
1445 return true;
1446 }
1447
1448 #if INCLUDE_CDS
1449 const char* unsupported_properties[] = { "jdk.module.limitmods",
1450 "jdk.module.upgrade.path",
1451 "jdk.module.patch.0" };
1452 const char* unsupported_options[] = { "--limit-modules",
1453 "--upgrade-module-path",
1454 "--patch-module"
1455 };
1456 void Arguments::check_unsupported_dumping_properties() {
1457 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1458 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1459 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1460 SystemProperty* sp = system_properties();
1461 while (sp != NULL) {
1462 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1463 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1464 vm_exit_during_initialization(
1465 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1466 }
1467 }
1468 sp = sp->next();
1469 }
1470
1471 // Check for an exploded module build in use with -Xshare:dump.
1472 if (!has_jimage()) {
1473 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1474 }
1475 }
1476
1477 bool Arguments::check_unsupported_cds_runtime_properties() {
1478 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1479 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1480 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1481 if (get_property(unsupported_properties[i]) != NULL) {
1482 if (RequireSharedSpaces) {
1483 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1484 }
1485 return true;
1486 }
1487 }
1488 return false;
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 defined(IA32)
1824 // Only server compiler can optimize safepoints well enough.
1825 if (!is_server_compilation_mode_vm()) {
1826 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1827 }
1828 #endif
1829
1830 set_conservative_max_heap_alignment();
1831
1832 #ifndef ZERO
1833 #ifdef _LP64
1834 set_use_compressed_oops();
1835
1836 // set_use_compressed_klass_ptrs() must be called after calling
1837 // set_use_compressed_oops().
1838 set_use_compressed_klass_ptrs();
1839
1840 // Also checks that certain machines are slower with compressed oops
1841 // in vm_version initialization code.
1842 #endif // _LP64
1843 #endif // !ZERO
1844
1845 return JNI_OK;
1846 }
1847
1848 julong Arguments::limit_by_allocatable_memory(julong limit) {
1849 julong max_allocatable;
1850 julong result = limit;
1851 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1852 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1853 }
1854 return result;
1855 }
1856
1857 // Use static initialization to get the default before parsing
1858 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1859
1860 void Arguments::set_heap_size() {
1861 julong phys_mem =
1862 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1863 : (julong)MaxRAM;
1864
1865 // Convert deprecated flags
1866 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1867 !FLAG_IS_DEFAULT(MaxRAMFraction))
1868 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1869
1870 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1871 !FLAG_IS_DEFAULT(MinRAMFraction))
1872 MinRAMPercentage = 100.0 / MinRAMFraction;
1873
1874 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1875 !FLAG_IS_DEFAULT(InitialRAMFraction))
1876 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1877
1878 // If the maximum heap size has not been set with -Xmx,
1879 // then set it as fraction of the size of physical memory,
1880 // respecting the maximum and minimum sizes of the heap.
1881 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1882 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1883 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1884 if (reasonable_min < MaxHeapSize) {
1885 // Small physical memory, so use a minimum fraction of it for the heap
1886 reasonable_max = reasonable_min;
1887 } else {
1888 // Not-small physical memory, so require a heap at least
1889 // as large as MaxHeapSize
1890 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1891 }
1892
1893 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1894 // Limit the heap size to ErgoHeapSizeLimit
1895 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1896 }
1897 if (UseCompressedOops) {
1898 // Limit the heap size to the maximum possible when using compressed oops
1899 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1900
1901 // HeapBaseMinAddress can be greater than default but not less than.
1902 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1903 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1904 // matches compressed oops printing flags
1905 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1906 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1907 DefaultHeapBaseMinAddress,
1908 DefaultHeapBaseMinAddress/G,
1909 HeapBaseMinAddress);
1910 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1911 }
1912 }
1913
1914 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1915 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1916 // but it should be not less than default MaxHeapSize.
1917 max_coop_heap -= HeapBaseMinAddress;
1918 }
1919 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1920 }
1921 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1922
1923 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1924 // An initial heap size was specified on the command line,
1925 // so be sure that the maximum size is consistent. Done
1926 // after call to limit_by_allocatable_memory because that
1927 // method might reduce the allocation size.
1928 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1929 }
1930
1931 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1932 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1933 }
1934
1935 // If the minimum or initial heap_size have not been set or requested to be set
1936 // ergonomically, set them accordingly.
1937 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1938 julong reasonable_minimum = (julong)(OldSize + NewSize);
1939
1940 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1941
1942 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1943
1944 if (InitialHeapSize == 0) {
1945 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1946
1947 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1948 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1949
1950 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1951
1952 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1953 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1954 }
1955 // If the minimum heap size has not been set (via -Xms),
1956 // synchronize with InitialHeapSize to avoid errors with the default value.
1957 if (min_heap_size() == 0) {
1958 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1959 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1960 }
1961 }
1962 }
1963
1964 // This option inspects the machine and attempts to set various
1965 // parameters to be optimal for long-running, memory allocation
1966 // intensive jobs. It is intended for machines with large
1967 // amounts of cpu and memory.
1968 jint Arguments::set_aggressive_heap_flags() {
1969 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1970 // VM, but we may not be able to represent the total physical memory
1971 // available (like having 8gb of memory on a box but using a 32bit VM).
1972 // Thus, we need to make sure we're using a julong for intermediate
1973 // calculations.
1974 julong initHeapSize;
1975 julong total_memory = os::physical_memory();
1976
1977 if (total_memory < (julong) 256 * M) {
1978 jio_fprintf(defaultStream::error_stream(),
1979 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1980 vm_exit(1);
1981 }
1982
1983 // The heap size is half of available memory, or (at most)
1984 // all of possible memory less 160mb (leaving room for the OS
1985 // when using ISM). This is the maximum; because adaptive sizing
1986 // is turned on below, the actual space used may be smaller.
1987
1988 initHeapSize = MIN2(total_memory / (julong) 2,
1989 total_memory - (julong) 160 * M);
1990
1991 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1992
1993 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1994 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
1995 return JNI_EINVAL;
1996 }
1997 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
1998 return JNI_EINVAL;
1999 }
2000 // Currently the minimum size and the initial heap sizes are the same.
2001 set_min_heap_size(initHeapSize);
2002 }
2003 if (FLAG_IS_DEFAULT(NewSize)) {
2004 // Make the young generation 3/8ths of the total heap.
2005 if (FLAG_SET_CMDLINE(size_t, NewSize,
2006 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2007 return JNI_EINVAL;
2008 }
2009 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2010 return JNI_EINVAL;
2011 }
2012 }
2013
2014 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2015 FLAG_SET_DEFAULT(UseLargePages, true);
2016 #endif
2017
2018 // Increase some data structure sizes for efficiency
2019 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2020 return JNI_EINVAL;
2021 }
2022 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2023 return JNI_EINVAL;
2024 }
2025 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2026 return JNI_EINVAL;
2027 }
2028
2029 // See the OldPLABSize comment below, but replace 'after promotion'
2030 // with 'after copying'. YoungPLABSize is the size of the survivor
2031 // space per-gc-thread buffers. The default is 4kw.
2032 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2033 return JNI_EINVAL;
2034 }
2035
2036 // OldPLABSize is the size of the buffers in the old gen that
2037 // UseParallelGC uses to promote live data that doesn't fit in the
2038 // survivor spaces. At any given time, there's one for each gc thread.
2039 // The default size is 1kw. These buffers are rarely used, since the
2040 // survivor spaces are usually big enough. For specjbb, however, there
2041 // are occasions when there's lots of live data in the young gen
2042 // and we end up promoting some of it. We don't have a definite
2043 // explanation for why bumping OldPLABSize helps, but the theory
2044 // is that a bigger PLAB results in retaining something like the
2045 // original allocation order after promotion, which improves mutator
2046 // locality. A minor effect may be that larger PLABs reduce the
2047 // number of PLAB allocation events during gc. The value of 8kw
2048 // was arrived at by experimenting with specjbb.
2049 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2050 return JNI_EINVAL;
2051 }
2052
2053 // Enable parallel GC and adaptive generation sizing
2054 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2055 return JNI_EINVAL;
2056 }
2057
2058 // Encourage steady state memory management
2059 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2060 return JNI_EINVAL;
2061 }
2062
2063 // This appears to improve mutator locality
2064 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2065 return JNI_EINVAL;
2066 }
2067
2068 // Get around early Solaris scheduling bug
2069 // (affinity vs other jobs on system)
2070 // but disallow DR and offlining (5008695).
2071 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2072 return JNI_EINVAL;
2073 }
2074
2075 return JNI_OK;
2076 }
2077
2078 // This must be called after ergonomics.
2079 void Arguments::set_bytecode_flags() {
2080 if (!RewriteBytecodes) {
2081 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2082 }
2083 }
2084
2085 // Aggressive optimization flags -XX:+AggressiveOpts
2086 jint Arguments::set_aggressive_opts_flags() {
2087 #ifdef COMPILER2
2088 if (AggressiveUnboxing) {
2089 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2090 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2091 } else if (!EliminateAutoBox) {
2092 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2093 AggressiveUnboxing = false;
2094 }
2095 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2096 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2097 } else if (!DoEscapeAnalysis) {
2098 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2099 AggressiveUnboxing = false;
2100 }
2101 }
2102 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2103 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2104 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2105 }
2106 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2107 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2108 }
2109
2110 // Feed the cache size setting into the JDK
2111 char buffer[1024];
2112 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2113 if (!add_property(buffer)) {
2114 return JNI_ENOMEM;
2115 }
2116 }
2117 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2118 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2119 }
2120 #endif
2121
2122 if (AggressiveOpts) {
2123 // Sample flag setting code
2124 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2125 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2126 // }
2127 }
2128
2129 return JNI_OK;
2130 }
2131
2132 //===========================================================================================================
2133 // Parsing of java.compiler property
2134
2135 void Arguments::process_java_compiler_argument(const char* arg) {
2136 // For backwards compatibility, Djava.compiler=NONE or ""
2137 // causes us to switch to -Xint mode UNLESS -Xdebug
2138 // is also specified.
2139 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2140 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2141 }
2142 }
2143
2144 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2145 _sun_java_launcher = os::strdup_check_oom(launcher);
2146 }
2147
2148 bool Arguments::created_by_java_launcher() {
2149 assert(_sun_java_launcher != NULL, "property must have value");
2150 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2151 }
2152
2153 bool Arguments::sun_java_launcher_is_altjvm() {
2154 return _sun_java_launcher_is_altjvm;
2155 }
2156
2157 //===========================================================================================================
2158 // Parsing of main arguments
2159
2160 #if INCLUDE_JVMCI
2161 // Check consistency of jvmci vm argument settings.
2162 bool Arguments::check_jvmci_args_consistency() {
2163 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2164 }
2165 #endif //INCLUDE_JVMCI
2166
2167 // Check the consistency of vm_init_args
2168 bool Arguments::check_vm_args_consistency() {
2169 // Method for adding checks for flag consistency.
2170 // The intent is to warn the user of all possible conflicts,
2171 // before returning an error.
2172 // Note: Needs platform-dependent factoring.
2173 bool status = true;
2174
2175 if (TLABRefillWasteFraction == 0) {
2176 jio_fprintf(defaultStream::error_stream(),
2177 "TLABRefillWasteFraction should be a denominator, "
2178 "not " SIZE_FORMAT "\n",
2179 TLABRefillWasteFraction);
2180 status = false;
2181 }
2182
2183 if (PrintNMTStatistics) {
2184 #if INCLUDE_NMT
2185 if (MemTracker::tracking_level() == NMT_off) {
2186 #endif // INCLUDE_NMT
2187 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2188 PrintNMTStatistics = false;
2189 #if INCLUDE_NMT
2190 }
2191 #endif
2192 }
2193
2194 #if INCLUDE_JVMCI
2195 status = status && check_jvmci_args_consistency();
2196
2197 if (EnableJVMCI) {
2198 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2199 AddProperty, UnwriteableProperty, InternalProperty);
2200
2201 if (!ScavengeRootsInCode) {
2202 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2203 ScavengeRootsInCode = 1;
2204 }
2205 }
2206 #endif
2207
2208 // Check lower bounds of the code cache
2209 // Template Interpreter code is approximately 3X larger in debug builds.
2210 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2211 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2212 jio_fprintf(defaultStream::error_stream(),
2213 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2214 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2215 status = false;
2216 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2217 jio_fprintf(defaultStream::error_stream(),
2218 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2219 min_code_cache_size/K);
2220 status = false;
2221 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2222 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2223 jio_fprintf(defaultStream::error_stream(),
2224 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2225 CODE_CACHE_SIZE_LIMIT/M);
2226 status = false;
2227 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2228 jio_fprintf(defaultStream::error_stream(),
2229 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2230 min_code_cache_size/K);
2231 status = false;
2232 }
2233
2234 #ifdef _LP64
2235 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2236 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2237 }
2238 #endif
2239
2240 #ifndef SUPPORT_RESERVED_STACK_AREA
2241 if (StackReservedPages != 0) {
2242 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2243 warning("Reserved Stack Area not supported on this platform");
2244 }
2245 #endif
2246
2247 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2248 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2249 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2250 }
2251 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2252 }
2253 if (UseCompiler && is_interpreter_only()) {
2254 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2255 warning("UseCompiler disabled due to -Xint.");
2256 }
2257 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2258 }
2259 #ifdef COMPILER2
2260 if (PostLoopMultiversioning && !RangeCheckElimination) {
2261 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2262 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2263 }
2264 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2265 }
2266 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2267 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2268 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2269 }
2270 LoopStripMiningIter = 1;
2271 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2272 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2273 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2274 }
2275 LoopStripMiningIter = 0;
2276 }
2277 #endif
2278 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2279 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2280 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2281 }
2282 }
2283 return status;
2284 }
2285
2286 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2287 const char* option_type) {
2288 if (ignore) return false;
2289
2290 const char* spacer = " ";
2291 if (option_type == NULL) {
2292 option_type = ++spacer; // Set both to the empty string.
2293 }
2294
2295 if (os::obsolete_option(option)) {
2296 jio_fprintf(defaultStream::error_stream(),
2297 "Obsolete %s%soption: %s\n", option_type, spacer,
2298 option->optionString);
2299 return false;
2300 } else {
2301 jio_fprintf(defaultStream::error_stream(),
2302 "Unrecognized %s%soption: %s\n", option_type, spacer,
2303 option->optionString);
2304 return true;
2305 }
2306 }
2307
2308 static const char* user_assertion_options[] = {
2309 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2310 };
2311
2312 static const char* system_assertion_options[] = {
2313 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2314 };
2315
2316 bool Arguments::parse_uintx(const char* value,
2317 uintx* uintx_arg,
2318 uintx min_size) {
2319
2320 // Check the sign first since atojulong() parses only unsigned values.
2321 bool value_is_positive = !(*value == '-');
2322
2323 if (value_is_positive) {
2324 julong n;
2325 bool good_return = atojulong(value, &n);
2326 if (good_return) {
2327 bool above_minimum = n >= min_size;
2328 bool value_is_too_large = n > max_uintx;
2329
2330 if (above_minimum && !value_is_too_large) {
2331 *uintx_arg = n;
2332 return true;
2333 }
2334 }
2335 }
2336 return false;
2337 }
2338
2339 unsigned int addreads_count = 0;
2340 unsigned int addexports_count = 0;
2341 unsigned int addopens_count = 0;
2342 unsigned int addmods_count = 0;
2343 unsigned int patch_mod_count = 0;
2344
2345 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2346 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2347 char* property = AllocateHeap(prop_len, mtArguments);
2348 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2349 if (ret < 0 || ret >= (int)prop_len) {
2350 FreeHeap(property);
2351 return false;
2352 }
2353 bool added = add_property(property, UnwriteableProperty, internal);
2354 FreeHeap(property);
2355 return added;
2356 }
2357
2358 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2359 const unsigned int props_count_limit = 1000;
2360 const int max_digits = 3;
2361 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2362
2363 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2364 if (count < props_count_limit) {
2365 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2366 char* property = AllocateHeap(prop_len, mtArguments);
2367 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2368 if (ret < 0 || ret >= (int)prop_len) {
2369 FreeHeap(property);
2370 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2371 return false;
2372 }
2373 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2374 FreeHeap(property);
2375 return added;
2376 }
2377
2378 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2379 return false;
2380 }
2381
2382 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2383 julong* long_arg,
2384 julong min_size,
2385 julong max_size) {
2386 if (!atojulong(s, long_arg)) return arg_unreadable;
2387 return check_memory_size(*long_arg, min_size, max_size);
2388 }
2389
2390 // Parse JavaVMInitArgs structure
2391
2392 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2393 const JavaVMInitArgs *java_options_args,
2394 const JavaVMInitArgs *cmd_line_args) {
2395 bool patch_mod_javabase = false;
2396
2397 // Save default settings for some mode flags
2398 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2399 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2400 Arguments::_ClipInlining = ClipInlining;
2401 Arguments::_BackgroundCompilation = BackgroundCompilation;
2402 if (TieredCompilation) {
2403 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2404 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2405 }
2406
2407 // Setup flags for mixed which is the default
2408 set_mode_flags(_mixed);
2409
2410 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2411 // variable (if present).
2412 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2413 if (result != JNI_OK) {
2414 return result;
2415 }
2416
2417 // Parse args structure generated from the command line flags.
2418 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2419 if (result != JNI_OK) {
2420 return result;
2421 }
2422
2423 // Parse args structure generated from the _JAVA_OPTIONS environment
2424 // variable (if present) (mimics classic VM)
2425 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2426 if (result != JNI_OK) {
2427 return result;
2428 }
2429
2430 // We need to ensure processor and memory resources have been properly
2431 // configured - which may rely on arguments we just processed - before
2432 // doing the final argument processing. Any argument processing that
2433 // needs to know about processor and memory resources must occur after
2434 // this point.
2435
2436 os::init_container_support();
2437
2438 // Do final processing now that all arguments have been parsed
2439 result = finalize_vm_init_args(patch_mod_javabase);
2440 if (result != JNI_OK) {
2441 return result;
2442 }
2443
2444 return JNI_OK;
2445 }
2446
2447 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2448 // represents a valid JDWP agent. is_path==true denotes that we
2449 // are dealing with -agentpath (case where name is a path), otherwise with
2450 // -agentlib
2451 bool valid_jdwp_agent(char *name, bool is_path) {
2452 char *_name;
2453 const char *_jdwp = "jdwp";
2454 size_t _len_jdwp, _len_prefix;
2455
2456 if (is_path) {
2457 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2458 return false;
2459 }
2460
2461 _name++; // skip past last path separator
2462 _len_prefix = strlen(JNI_LIB_PREFIX);
2463
2464 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2465 return false;
2466 }
2467
2468 _name += _len_prefix;
2469 _len_jdwp = strlen(_jdwp);
2470
2471 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2472 _name += _len_jdwp;
2473 }
2474 else {
2475 return false;
2476 }
2477
2478 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2479 return false;
2480 }
2481
2482 return true;
2483 }
2484
2485 if (strcmp(name, _jdwp) == 0) {
2486 return true;
2487 }
2488
2489 return false;
2490 }
2491
2492 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2493 // --patch-module=<module>=<file>(<pathsep><file>)*
2494 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2495 // Find the equal sign between the module name and the path specification
2496 const char* module_equal = strchr(patch_mod_tail, '=');
2497 if (module_equal == NULL) {
2498 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2499 return JNI_ERR;
2500 } else {
2501 // Pick out the module name
2502 size_t module_len = module_equal - patch_mod_tail;
2503 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2504 if (module_name != NULL) {
2505 memcpy(module_name, patch_mod_tail, module_len);
2506 *(module_name + module_len) = '\0';
2507 // The path piece begins one past the module_equal sign
2508 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2509 FREE_C_HEAP_ARRAY(char, module_name);
2510 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2511 return JNI_ENOMEM;
2512 }
2513 } else {
2514 return JNI_ENOMEM;
2515 }
2516 }
2517 return JNI_OK;
2518 }
2519
2520 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2521 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2522 // The min and max sizes match the values in globals.hpp, but scaled
2523 // with K. The values have been chosen so that alignment with page
2524 // size doesn't change the max value, which makes the conversions
2525 // back and forth between Xss value and ThreadStackSize value easier.
2526 // The values have also been chosen to fit inside a 32-bit signed type.
2527 const julong min_ThreadStackSize = 0;
2528 const julong max_ThreadStackSize = 1 * M;
2529
2530 const julong min_size = min_ThreadStackSize * K;
2531 const julong max_size = max_ThreadStackSize * K;
2532
2533 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2534
2535 julong size = 0;
2536 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2537 if (errcode != arg_in_range) {
2538 bool silent = (option == NULL); // Allow testing to silence error messages
2539 if (!silent) {
2540 jio_fprintf(defaultStream::error_stream(),
2541 "Invalid thread stack size: %s\n", option->optionString);
2542 describe_range_error(errcode);
2543 }
2544 return JNI_EINVAL;
2545 }
2546
2547 // Internally track ThreadStackSize in units of 1024 bytes.
2548 const julong size_aligned = align_up(size, K);
2549 assert(size <= size_aligned,
2550 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2551 size, size_aligned);
2552
2553 const julong size_in_K = size_aligned / K;
2554 assert(size_in_K < (julong)max_intx,
2555 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2556 size_in_K);
2557
2558 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2559 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2560 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2561 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2562 max_expanded, size_in_K);
2563
2564 *out_ThreadStackSize = (intx)size_in_K;
2565
2566 return JNI_OK;
2567 }
2568
2569 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2570 // For match_option to return remaining or value part of option string
2571 const char* tail;
2572
2573 // iterate over arguments
2574 for (int index = 0; index < args->nOptions; index++) {
2575 bool is_absolute_path = false; // for -agentpath vs -agentlib
2576
2577 const JavaVMOption* option = args->options + index;
2578
2579 if (!match_option(option, "-Djava.class.path", &tail) &&
2580 !match_option(option, "-Dsun.java.command", &tail) &&
2581 !match_option(option, "-Dsun.java.launcher", &tail)) {
2582
2583 // add all jvm options to the jvm_args string. This string
2584 // is used later to set the java.vm.args PerfData string constant.
2585 // the -Djava.class.path and the -Dsun.java.command options are
2586 // omitted from jvm_args string as each have their own PerfData
2587 // string constant object.
2588 build_jvm_args(option->optionString);
2589 }
2590
2591 // -verbose:[class/module/gc/jni]
2592 if (match_option(option, "-verbose", &tail)) {
2593 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2594 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2595 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2596 } else if (!strcmp(tail, ":module")) {
2597 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2598 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2599 } else if (!strcmp(tail, ":gc")) {
2600 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2601 } else if (!strcmp(tail, ":jni")) {
2602 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 }
2606 // -da / -ea / -disableassertions / -enableassertions
2607 // These accept an optional class/package name separated by a colon, e.g.,
2608 // -da:java.lang.Thread.
2609 } else if (match_option(option, user_assertion_options, &tail, true)) {
2610 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2611 if (*tail == '\0') {
2612 JavaAssertions::setUserClassDefault(enable);
2613 } else {
2614 assert(*tail == ':', "bogus match by match_option()");
2615 JavaAssertions::addOption(tail + 1, enable);
2616 }
2617 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2618 } else if (match_option(option, system_assertion_options, &tail, false)) {
2619 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2620 JavaAssertions::setSystemClassDefault(enable);
2621 // -bootclasspath:
2622 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2623 jio_fprintf(defaultStream::output_stream(),
2624 "-Xbootclasspath is no longer a supported option.\n");
2625 return JNI_EINVAL;
2626 // -bootclasspath/a:
2627 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2628 Arguments::append_sysclasspath(tail);
2629 // -bootclasspath/p:
2630 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2631 jio_fprintf(defaultStream::output_stream(),
2632 "-Xbootclasspath/p is no longer a supported option.\n");
2633 return JNI_EINVAL;
2634 // -Xrun
2635 } else if (match_option(option, "-Xrun", &tail)) {
2636 if (tail != NULL) {
2637 const char* pos = strchr(tail, ':');
2638 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2639 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2640 jio_snprintf(name, len + 1, "%s", tail);
2641
2642 char *options = NULL;
2643 if(pos != NULL) {
2644 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2645 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2646 }
2647 #if !INCLUDE_JVMTI
2648 if (strcmp(name, "jdwp") == 0) {
2649 jio_fprintf(defaultStream::error_stream(),
2650 "Debugging agents are not supported in this VM\n");
2651 return JNI_ERR;
2652 }
2653 #endif // !INCLUDE_JVMTI
2654 add_init_library(name, options);
2655 }
2656 } else if (match_option(option, "--add-reads=", &tail)) {
2657 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2658 return JNI_ENOMEM;
2659 }
2660 } else if (match_option(option, "--add-exports=", &tail)) {
2661 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2662 return JNI_ENOMEM;
2663 }
2664 } else if (match_option(option, "--add-opens=", &tail)) {
2665 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2666 return JNI_ENOMEM;
2667 }
2668 } else if (match_option(option, "--add-modules=", &tail)) {
2669 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2670 return JNI_ENOMEM;
2671 }
2672 } else if (match_option(option, "--limit-modules=", &tail)) {
2673 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2674 return JNI_ENOMEM;
2675 }
2676 } else if (match_option(option, "--module-path=", &tail)) {
2677 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2678 return JNI_ENOMEM;
2679 }
2680 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2681 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2682 return JNI_ENOMEM;
2683 }
2684 } else if (match_option(option, "--patch-module=", &tail)) {
2685 // --patch-module=<module>=<file>(<pathsep><file>)*
2686 int res = process_patch_mod_option(tail, patch_mod_javabase);
2687 if (res != JNI_OK) {
2688 return res;
2689 }
2690 } else if (match_option(option, "--illegal-access=", &tail)) {
2691 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2692 return JNI_ENOMEM;
2693 }
2694 // -agentlib and -agentpath
2695 } else if (match_option(option, "-agentlib:", &tail) ||
2696 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2697 if(tail != NULL) {
2698 const char* pos = strchr(tail, '=');
2699 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2700 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2701 name[len] = '\0';
2702
2703 char *options = NULL;
2704 if(pos != NULL) {
2705 options = os::strdup_check_oom(pos + 1, mtArguments);
2706 }
2707 #if !INCLUDE_JVMTI
2708 if (valid_jdwp_agent(name, is_absolute_path)) {
2709 jio_fprintf(defaultStream::error_stream(),
2710 "Debugging agents are not supported in this VM\n");
2711 return JNI_ERR;
2712 }
2713 #endif // !INCLUDE_JVMTI
2714 add_init_agent(name, options, is_absolute_path);
2715 }
2716 // -javaagent
2717 } else if (match_option(option, "-javaagent:", &tail)) {
2718 #if !INCLUDE_JVMTI
2719 jio_fprintf(defaultStream::error_stream(),
2720 "Instrumentation agents are not supported in this VM\n");
2721 return JNI_ERR;
2722 #else
2723 if (tail != NULL) {
2724 size_t length = strlen(tail) + 1;
2725 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2726 jio_snprintf(options, length, "%s", tail);
2727 add_instrument_agent("instrument", options, false);
2728 // java agents need module java.instrument
2729 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2730 return JNI_ENOMEM;
2731 }
2732 }
2733 #endif // !INCLUDE_JVMTI
2734 // --enable_preview
2735 } else if (match_option(option, "--enable-preview")) {
2736 set_enable_preview();
2737 // -Xnoclassgc
2738 } else if (match_option(option, "-Xnoclassgc")) {
2739 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 // -Xconcgc
2743 } else if (match_option(option, "-Xconcgc")) {
2744 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2748 // -Xnoconcgc
2749 } else if (match_option(option, "-Xnoconcgc")) {
2750 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2751 return JNI_EINVAL;
2752 }
2753 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2754 // -Xbatch
2755 } else if (match_option(option, "-Xbatch")) {
2756 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 // -Xmn for compatibility with other JVM vendors
2760 } else if (match_option(option, "-Xmn", &tail)) {
2761 julong long_initial_young_size = 0;
2762 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2763 if (errcode != arg_in_range) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "Invalid initial young generation size: %s\n", option->optionString);
2766 describe_range_error(errcode);
2767 return JNI_EINVAL;
2768 }
2769 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2770 return JNI_EINVAL;
2771 }
2772 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 // -Xms
2776 } else if (match_option(option, "-Xms", &tail)) {
2777 julong long_initial_heap_size = 0;
2778 // an initial heap size of 0 means automatically determine
2779 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2780 if (errcode != arg_in_range) {
2781 jio_fprintf(defaultStream::error_stream(),
2782 "Invalid initial heap size: %s\n", option->optionString);
2783 describe_range_error(errcode);
2784 return JNI_EINVAL;
2785 }
2786 set_min_heap_size((size_t)long_initial_heap_size);
2787 // Currently the minimum size and the initial heap sizes are the same.
2788 // Can be overridden with -XX:InitialHeapSize.
2789 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2790 return JNI_EINVAL;
2791 }
2792 // -Xmx
2793 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2794 julong long_max_heap_size = 0;
2795 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2796 if (errcode != arg_in_range) {
2797 jio_fprintf(defaultStream::error_stream(),
2798 "Invalid maximum heap size: %s\n", option->optionString);
2799 describe_range_error(errcode);
2800 return JNI_EINVAL;
2801 }
2802 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 // Xmaxf
2806 } else if (match_option(option, "-Xmaxf", &tail)) {
2807 char* err;
2808 int maxf = (int)(strtod(tail, &err) * 100);
2809 if (*err != '\0' || *tail == '\0') {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Bad max heap free percentage size: %s\n",
2812 option->optionString);
2813 return JNI_EINVAL;
2814 } else {
2815 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2816 return JNI_EINVAL;
2817 }
2818 }
2819 // Xminf
2820 } else if (match_option(option, "-Xminf", &tail)) {
2821 char* err;
2822 int minf = (int)(strtod(tail, &err) * 100);
2823 if (*err != '\0' || *tail == '\0') {
2824 jio_fprintf(defaultStream::error_stream(),
2825 "Bad min heap free percentage size: %s\n",
2826 option->optionString);
2827 return JNI_EINVAL;
2828 } else {
2829 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2830 return JNI_EINVAL;
2831 }
2832 }
2833 // -Xss
2834 } else if (match_option(option, "-Xss", &tail)) {
2835 intx value = 0;
2836 jint err = parse_xss(option, tail, &value);
2837 if (err != JNI_OK) {
2838 return err;
2839 }
2840 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2841 return JNI_EINVAL;
2842 }
2843 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2844 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2845 julong long_ReservedCodeCacheSize = 0;
2846
2847 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2848 if (errcode != arg_in_range) {
2849 jio_fprintf(defaultStream::error_stream(),
2850 "Invalid maximum code cache size: %s.\n", option->optionString);
2851 return JNI_EINVAL;
2852 }
2853 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 // -green
2857 } else if (match_option(option, "-green")) {
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Green threads support not available\n");
2860 return JNI_EINVAL;
2861 // -native
2862 } else if (match_option(option, "-native")) {
2863 // HotSpot always uses native threads, ignore silently for compatibility
2864 // -Xrs
2865 } else if (match_option(option, "-Xrs")) {
2866 // Classic/EVM option, new functionality
2867 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 // -Xprof
2871 } else if (match_option(option, "-Xprof")) {
2872 char version[256];
2873 // Obsolete in JDK 10
2874 JDK_Version::jdk(10).to_string(version, sizeof(version));
2875 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2876 // -Xconcurrentio
2877 } else if (match_option(option, "-Xconcurrentio")) {
2878 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2879 return JNI_EINVAL;
2880 }
2881 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2885 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2889 return JNI_EINVAL;
2890 }
2891
2892 // -Xinternalversion
2893 } else if (match_option(option, "-Xinternalversion")) {
2894 jio_fprintf(defaultStream::output_stream(), "%s\n",
2895 VM_Version::internal_vm_info_string());
2896 vm_exit(0);
2897 #ifndef PRODUCT
2898 // -Xprintflags
2899 } else if (match_option(option, "-Xprintflags")) {
2900 CommandLineFlags::printFlags(tty, false);
2901 vm_exit(0);
2902 #endif
2903 // -D
2904 } else if (match_option(option, "-D", &tail)) {
2905 const char* value;
2906 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2907 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2908 // abort if -Djava.endorsed.dirs is set
2909 jio_fprintf(defaultStream::output_stream(),
2910 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2911 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2912 return JNI_EINVAL;
2913 }
2914 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2915 *value != '\0' && strcmp(value, "\"\"") != 0) {
2916 // abort if -Djava.ext.dirs is set
2917 jio_fprintf(defaultStream::output_stream(),
2918 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2919 return JNI_EINVAL;
2920 }
2921 // Check for module related properties. They must be set using the modules
2922 // options. For example: use "--add-modules=java.sql", not
2923 // "-Djdk.module.addmods=java.sql"
2924 if (is_internal_module_property(option->optionString + 2)) {
2925 needs_module_property_warning = true;
2926 continue;
2927 }
2928
2929 if (!add_property(tail)) {
2930 return JNI_ENOMEM;
2931 }
2932 // Out of the box management support
2933 if (match_option(option, "-Dcom.sun.management", &tail)) {
2934 #if INCLUDE_MANAGEMENT
2935 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2936 return JNI_EINVAL;
2937 }
2938 // management agent in module jdk.management.agent
2939 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2940 return JNI_ENOMEM;
2941 }
2942 #else
2943 jio_fprintf(defaultStream::output_stream(),
2944 "-Dcom.sun.management is not supported in this VM.\n");
2945 return JNI_ERR;
2946 #endif
2947 }
2948 // -Xint
2949 } else if (match_option(option, "-Xint")) {
2950 set_mode_flags(_int);
2951 // -Xmixed
2952 } else if (match_option(option, "-Xmixed")) {
2953 set_mode_flags(_mixed);
2954 // -Xcomp
2955 } else if (match_option(option, "-Xcomp")) {
2956 // for testing the compiler; turn off all flags that inhibit compilation
2957 set_mode_flags(_comp);
2958 // -Xshare:dump
2959 } else if (match_option(option, "-Xshare:dump")) {
2960 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 set_mode_flags(_int); // Prevent compilation, which creates objects
2964 // -Xshare:on
2965 } else if (match_option(option, "-Xshare:on")) {
2966 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 // -Xshare:auto
2973 } else if (match_option(option, "-Xshare:auto")) {
2974 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2975 return JNI_EINVAL;
2976 }
2977 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2978 return JNI_EINVAL;
2979 }
2980 // -Xshare:off
2981 } else if (match_option(option, "-Xshare:off")) {
2982 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2983 return JNI_EINVAL;
2984 }
2985 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2986 return JNI_EINVAL;
2987 }
2988 // -Xverify
2989 } else if (match_option(option, "-Xverify", &tail)) {
2990 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2991 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2992 return JNI_EINVAL;
2993 }
2994 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2995 return JNI_EINVAL;
2996 }
2997 } else if (strcmp(tail, ":remote") == 0) {
2998 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2999 return JNI_EINVAL;
3000 }
3001 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3002 return JNI_EINVAL;
3003 }
3004 } else if (strcmp(tail, ":none") == 0) {
3005 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3009 return JNI_EINVAL;
3010 }
3011 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3012 return JNI_EINVAL;
3013 }
3014 // -Xdebug
3015 } else if (match_option(option, "-Xdebug")) {
3016 // note this flag has been used, then ignore
3017 set_xdebug_mode(true);
3018 // -Xnoagent
3019 } else if (match_option(option, "-Xnoagent")) {
3020 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3021 } else if (match_option(option, "-Xloggc:", &tail)) {
3022 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3023 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3024 _gc_log_filename = os::strdup_check_oom(tail);
3025 } else if (match_option(option, "-Xlog", &tail)) {
3026 bool ret = false;
3027 if (strcmp(tail, ":help") == 0) {
3028 fileStream stream(defaultStream::output_stream());
3029 LogConfiguration::print_command_line_help(&stream);
3030 vm_exit(0);
3031 } else if (strcmp(tail, ":disable") == 0) {
3032 LogConfiguration::disable_logging();
3033 ret = true;
3034 } else if (*tail == '\0') {
3035 ret = LogConfiguration::parse_command_line_arguments();
3036 assert(ret, "-Xlog without arguments should never fail to parse");
3037 } else if (*tail == ':') {
3038 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3039 }
3040 if (ret == false) {
3041 jio_fprintf(defaultStream::error_stream(),
3042 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
3043 tail);
3044 return JNI_EINVAL;
3045 }
3046 // JNI hooks
3047 } else if (match_option(option, "-Xcheck", &tail)) {
3048 if (!strcmp(tail, ":jni")) {
3049 #if !INCLUDE_JNI_CHECK
3050 warning("JNI CHECKING is not supported in this VM");
3051 #else
3052 CheckJNICalls = true;
3053 #endif // INCLUDE_JNI_CHECK
3054 } else if (is_bad_option(option, args->ignoreUnrecognized,
3055 "check")) {
3056 return JNI_EINVAL;
3057 }
3058 } else if (match_option(option, "vfprintf")) {
3059 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3060 } else if (match_option(option, "exit")) {
3061 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3062 } else if (match_option(option, "abort")) {
3063 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3064 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3065 // and the last option wins.
3066 } else if (match_option(option, "-XX:+NeverTenure")) {
3067 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3074 return JNI_EINVAL;
3075 }
3076 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3077 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3084 return JNI_EINVAL;
3085 }
3086 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3087 uintx max_tenuring_thresh = 0;
3088 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3089 jio_fprintf(defaultStream::error_stream(),
3090 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3091 return JNI_EINVAL;
3092 }
3093
3094 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3095 return JNI_EINVAL;
3096 }
3097
3098 if (MaxTenuringThreshold == 0) {
3099 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3100 return JNI_EINVAL;
3101 }
3102 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3103 return JNI_EINVAL;
3104 }
3105 } else {
3106 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3107 return JNI_EINVAL;
3108 }
3109 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3110 return JNI_EINVAL;
3111 }
3112 }
3113 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3114 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3115 return JNI_EINVAL;
3116 }
3117 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3118 return JNI_EINVAL;
3119 }
3120 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3121 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3128 #if defined(DTRACE_ENABLED)
3129 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3130 return JNI_EINVAL;
3131 }
3132 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3133 return JNI_EINVAL;
3134 }
3135 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3139 return JNI_EINVAL;
3140 }
3141 #else // defined(DTRACE_ENABLED)
3142 jio_fprintf(defaultStream::error_stream(),
3143 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3144 return JNI_EINVAL;
3145 #endif // defined(DTRACE_ENABLED)
3146 #ifdef ASSERT
3147 } else if (match_option(option, "-XX:+FullGCALot")) {
3148 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 // disable scavenge before parallel mark-compact
3152 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 #endif
3156 #if !INCLUDE_MANAGEMENT
3157 } else if (match_option(option, "-XX:+ManagementServer")) {
3158 jio_fprintf(defaultStream::error_stream(),
3159 "ManagementServer is not supported in this VM.\n");
3160 return JNI_ERR;
3161 #endif // INCLUDE_MANAGEMENT
3162 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3163 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3164 // already been handled
3165 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3166 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3167 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3168 return JNI_EINVAL;
3169 }
3170 }
3171 // Unknown option
3172 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3173 return JNI_ERR;
3174 }
3175 }
3176
3177 // PrintSharedArchiveAndExit will turn on
3178 // -Xshare:on
3179 // -Xlog:class+path=info
3180 if (PrintSharedArchiveAndExit) {
3181 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3182 return JNI_EINVAL;
3183 }
3184 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3188 }
3189
3190 // Change the default value for flags which have different default values
3191 // when working with older JDKs.
3192 #ifdef LINUX
3193 if (JDK_Version::current().compare_major(6) <= 0 &&
3194 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3195 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3196 }
3197 #endif // LINUX
3198 fix_appclasspath();
3199 return JNI_OK;
3200 }
3201
3202 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3203 // For java.base check for duplicate --patch-module options being specified on the command line.
3204 // This check is only required for java.base, all other duplicate module specifications
3205 // will be checked during module system initialization. The module system initialization
3206 // will throw an ExceptionInInitializerError if this situation occurs.
3207 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3208 if (*patch_mod_javabase) {
3209 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3210 } else {
3211 *patch_mod_javabase = true;
3212 }
3213 }
3214
3215 // Create GrowableArray lazily, only if --patch-module has been specified
3216 if (_patch_mod_prefix == NULL) {
3217 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3218 }
3219
3220 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3221 }
3222
3223 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3224 //
3225 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3226 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3227 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3228 // path is treated as the current directory.
3229 //
3230 // This causes problems with CDS, which requires that all directories specified in the classpath
3231 // must be empty. In most cases, applications do NOT want to load classes from the current
3232 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3233 // scripts compatible with CDS.
3234 void Arguments::fix_appclasspath() {
3235 if (IgnoreEmptyClassPaths) {
3236 const char separator = *os::path_separator();
3237 const char* src = _java_class_path->value();
3238
3239 // skip over all the leading empty paths
3240 while (*src == separator) {
3241 src ++;
3242 }
3243
3244 char* copy = os::strdup_check_oom(src, mtArguments);
3245
3246 // trim all trailing empty paths
3247 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3248 *tail = '\0';
3249 }
3250
3251 char from[3] = {separator, separator, '\0'};
3252 char to [2] = {separator, '\0'};
3253 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3254 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3255 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3256 }
3257
3258 _java_class_path->set_writeable_value(copy);
3259 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3260 }
3261 }
3262
3263 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3264 // check if the default lib/endorsed directory exists; if so, error
3265 char path[JVM_MAXPATHLEN];
3266 const char* fileSep = os::file_separator();
3267 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3268
3269 DIR* dir = os::opendir(path);
3270 if (dir != NULL) {
3271 jio_fprintf(defaultStream::output_stream(),
3272 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3273 "in modular form will be supported via the concept of upgradeable modules.\n");
3274 os::closedir(dir);
3275 return JNI_ERR;
3276 }
3277
3278 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3279 dir = os::opendir(path);
3280 if (dir != NULL) {
3281 jio_fprintf(defaultStream::output_stream(),
3282 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3283 "Use -classpath instead.\n.");
3284 os::closedir(dir);
3285 return JNI_ERR;
3286 }
3287
3288 // This must be done after all arguments have been processed
3289 // and the container support has been initialized since AggressiveHeap
3290 // relies on the amount of total memory available.
3291 if (AggressiveHeap) {
3292 jint result = set_aggressive_heap_flags();
3293 if (result != JNI_OK) {
3294 return result;
3295 }
3296 }
3297
3298 // This must be done after all arguments have been processed.
3299 // java_compiler() true means set to "NONE" or empty.
3300 if (java_compiler() && !xdebug_mode()) {
3301 // For backwards compatibility, we switch to interpreted mode if
3302 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3303 // not specified.
3304 set_mode_flags(_int);
3305 }
3306
3307 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3308 // but like -Xint, leave compilation thresholds unaffected.
3309 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3310 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3311 set_mode_flags(_int);
3312 }
3313
3314 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3315 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3316 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3317 }
3318
3319 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3320 // Don't degrade server performance for footprint
3321 if (FLAG_IS_DEFAULT(UseLargePages) &&
3322 MaxHeapSize < LargePageHeapSizeThreshold) {
3323 // No need for large granularity pages w/small heaps.
3324 // Note that large pages are enabled/disabled for both the
3325 // Java heap and the code cache.
3326 FLAG_SET_DEFAULT(UseLargePages, false);
3327 }
3328
3329 #elif defined(COMPILER2)
3330 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3331 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3332 }
3333 #endif
3334
3335 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3336 UNSUPPORTED_OPTION(ProfileInterpreter);
3337 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3338 #endif
3339
3340 #ifndef TIERED
3341 // Tiered compilation is undefined.
3342 UNSUPPORTED_OPTION(TieredCompilation);
3343 #endif
3344
3345 #if INCLUDE_JVMCI
3346 if (EnableJVMCI &&
3347 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3348 return JNI_ENOMEM;
3349 }
3350 #endif
3351
3352 if (!check_vm_args_consistency()) {
3353 return JNI_ERR;
3354 }
3355
3356 #if INCLUDE_JVMCI
3357 if (UseJVMCICompiler) {
3358 Compilation_mode = CompMode_server;
3359 }
3360 #endif
3361
3362 #if INCLUDE_CDS
3363 if (DumpSharedSpaces) {
3364 // Disable biased locking now as it interferes with the clean up of
3365 // the archived Klasses and Java string objects (at dump time only).
3366 UseBiasedLocking = false;
3367
3368 // Always verify non-system classes during CDS dump
3369 if (!BytecodeVerificationRemote) {
3370 BytecodeVerificationRemote = true;
3371 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3372 }
3373 }
3374 if (UseSharedSpaces && patch_mod_javabase) {
3375 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3376 }
3377 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3378 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3379 }
3380 #endif
3381
3382 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3383 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3384 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3385
3386 return JNI_OK;
3387 }
3388
3389 // Helper class for controlling the lifetime of JavaVMInitArgs
3390 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3391 // deleted on the destruction of the ScopedVMInitArgs object.
3392 class ScopedVMInitArgs : public StackObj {
3393 private:
3394 JavaVMInitArgs _args;
3395 char* _container_name;
3396 bool _is_set;
3397 char* _vm_options_file_arg;
3398
3399 public:
3400 ScopedVMInitArgs(const char *container_name) {
3401 _args.version = JNI_VERSION_1_2;
3402 _args.nOptions = 0;
3403 _args.options = NULL;
3404 _args.ignoreUnrecognized = false;
3405 _container_name = (char *)container_name;
3406 _is_set = false;
3407 _vm_options_file_arg = NULL;
3408 }
3409
3410 // Populates the JavaVMInitArgs object represented by this
3411 // ScopedVMInitArgs object with the arguments in options. The
3412 // allocated memory is deleted by the destructor. If this method
3413 // returns anything other than JNI_OK, then this object is in a
3414 // partially constructed state, and should be abandoned.
3415 jint set_args(GrowableArray<JavaVMOption>* options) {
3416 _is_set = true;
3417 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3418 JavaVMOption, options->length(), mtArguments);
3419 if (options_arr == NULL) {
3420 return JNI_ENOMEM;
3421 }
3422 _args.options = options_arr;
3423
3424 for (int i = 0; i < options->length(); i++) {
3425 options_arr[i] = options->at(i);
3426 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3427 if (options_arr[i].optionString == NULL) {
3428 // Rely on the destructor to do cleanup.
3429 _args.nOptions = i;
3430 return JNI_ENOMEM;
3431 }
3432 }
3433
3434 _args.nOptions = options->length();
3435 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3436 return JNI_OK;
3437 }
3438
3439 JavaVMInitArgs* get() { return &_args; }
3440 char* container_name() { return _container_name; }
3441 bool is_set() { return _is_set; }
3442 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3443 char* vm_options_file_arg() { return _vm_options_file_arg; }
3444
3445 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3446 if (_vm_options_file_arg != NULL) {
3447 os::free(_vm_options_file_arg);
3448 }
3449 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3450 }
3451
3452 ~ScopedVMInitArgs() {
3453 if (_vm_options_file_arg != NULL) {
3454 os::free(_vm_options_file_arg);
3455 }
3456 if (_args.options == NULL) return;
3457 for (int i = 0; i < _args.nOptions; i++) {
3458 os::free(_args.options[i].optionString);
3459 }
3460 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3461 }
3462
3463 // Insert options into this option list, to replace option at
3464 // vm_options_file_pos (-XX:VMOptionsFile)
3465 jint insert(const JavaVMInitArgs* args,
3466 const JavaVMInitArgs* args_to_insert,
3467 const int vm_options_file_pos) {
3468 assert(_args.options == NULL, "shouldn't be set yet");
3469 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3470 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3471
3472 int length = args->nOptions + args_to_insert->nOptions - 1;
3473 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3474 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3475 for (int i = 0; i < args->nOptions; i++) {
3476 if (i == vm_options_file_pos) {
3477 // insert the new options starting at the same place as the
3478 // -XX:VMOptionsFile option
3479 for (int j = 0; j < args_to_insert->nOptions; j++) {
3480 options->push(args_to_insert->options[j]);
3481 }
3482 } else {
3483 options->push(args->options[i]);
3484 }
3485 }
3486 // make into options array
3487 jint result = set_args(options);
3488 delete options;
3489 return result;
3490 }
3491 };
3492
3493 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3494 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3495 }
3496
3497 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3498 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3499 }
3500
3501 jint Arguments::parse_options_environment_variable(const char* name,
3502 ScopedVMInitArgs* vm_args) {
3503 char *buffer = ::getenv(name);
3504
3505 // Don't check this environment variable if user has special privileges
3506 // (e.g. unix su command).
3507 if (buffer == NULL || os::have_special_privileges()) {
3508 return JNI_OK;
3509 }
3510
3511 if ((buffer = os::strdup(buffer)) == NULL) {
3512 return JNI_ENOMEM;
3513 }
3514
3515 jio_fprintf(defaultStream::error_stream(),
3516 "Picked up %s: %s\n", name, buffer);
3517
3518 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3519
3520 os::free(buffer);
3521 return retcode;
3522 }
3523
3524 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3525 // read file into buffer
3526 int fd = ::open(file_name, O_RDONLY);
3527 if (fd < 0) {
3528 jio_fprintf(defaultStream::error_stream(),
3529 "Could not open options file '%s'\n",
3530 file_name);
3531 return JNI_ERR;
3532 }
3533
3534 struct stat stbuf;
3535 int retcode = os::stat(file_name, &stbuf);
3536 if (retcode != 0) {
3537 jio_fprintf(defaultStream::error_stream(),
3538 "Could not stat options file '%s'\n",
3539 file_name);
3540 os::close(fd);
3541 return JNI_ERR;
3542 }
3543
3544 if (stbuf.st_size == 0) {
3545 // tell caller there is no option data and that is ok
3546 os::close(fd);
3547 return JNI_OK;
3548 }
3549
3550 // '+ 1' for NULL termination even with max bytes
3551 size_t bytes_alloc = stbuf.st_size + 1;
3552
3553 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3554 if (NULL == buf) {
3555 jio_fprintf(defaultStream::error_stream(),
3556 "Could not allocate read buffer for options file parse\n");
3557 os::close(fd);
3558 return JNI_ENOMEM;
3559 }
3560
3561 memset(buf, 0, bytes_alloc);
3562
3563 // Fill buffer
3564 // Use ::read() instead of os::read because os::read()
3565 // might do a thread state transition
3566 // and it is too early for that here
3567
3568 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3569 os::close(fd);
3570 if (bytes_read < 0) {
3571 FREE_C_HEAP_ARRAY(char, buf);
3572 jio_fprintf(defaultStream::error_stream(),
3573 "Could not read options file '%s'\n", file_name);
3574 return JNI_ERR;
3575 }
3576
3577 if (bytes_read == 0) {
3578 // tell caller there is no option data and that is ok
3579 FREE_C_HEAP_ARRAY(char, buf);
3580 return JNI_OK;
3581 }
3582
3583 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3584
3585 FREE_C_HEAP_ARRAY(char, buf);
3586 return retcode;
3587 }
3588
3589 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3590 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3591
3592 // some pointers to help with parsing
3593 char *buffer_end = buffer + buf_len;
3594 char *opt_hd = buffer;
3595 char *wrt = buffer;
3596 char *rd = buffer;
3597
3598 // parse all options
3599 while (rd < buffer_end) {
3600 // skip leading white space from the input string
3601 while (rd < buffer_end && isspace(*rd)) {
3602 rd++;
3603 }
3604
3605 if (rd >= buffer_end) {
3606 break;
3607 }
3608
3609 // Remember this is where we found the head of the token.
3610 opt_hd = wrt;
3611
3612 // Tokens are strings of non white space characters separated
3613 // by one or more white spaces.
3614 while (rd < buffer_end && !isspace(*rd)) {
3615 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3616 int quote = *rd; // matching quote to look for
3617 rd++; // don't copy open quote
3618 while (rd < buffer_end && *rd != quote) {
3619 // include everything (even spaces)
3620 // up until the close quote
3621 *wrt++ = *rd++; // copy to option string
3622 }
3623
3624 if (rd < buffer_end) {
3625 rd++; // don't copy close quote
3626 } else {
3627 // did not see closing quote
3628 jio_fprintf(defaultStream::error_stream(),
3629 "Unmatched quote in %s\n", name);
3630 delete options;
3631 return JNI_ERR;
3632 }
3633 } else {
3634 *wrt++ = *rd++; // copy to option string
3635 }
3636 }
3637
3638 // steal a white space character and set it to NULL
3639 *wrt++ = '\0';
3640 // We now have a complete token
3641
3642 JavaVMOption option;
3643 option.optionString = opt_hd;
3644 option.extraInfo = NULL;
3645
3646 options->append(option); // Fill in option
3647
3648 rd++; // Advance to next character
3649 }
3650
3651 // Fill out JavaVMInitArgs structure.
3652 jint status = vm_args->set_args(options);
3653
3654 delete options;
3655 return status;
3656 }
3657
3658 void Arguments::set_shared_spaces_flags() {
3659 if (DumpSharedSpaces) {
3660 if (FailOverToOldVerifier) {
3661 // Don't fall back to the old verifier on verification failure. If a
3662 // class fails verification with the split verifier, it might fail the
3663 // CDS runtime verifier constraint check. In that case, we don't want
3664 // to share the class. We only archive classes that pass the split verifier.
3665 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3666 }
3667
3668 if (RequireSharedSpaces) {
3669 warning("Cannot dump shared archive while using shared archive");
3670 }
3671 UseSharedSpaces = false;
3672 #ifdef _LP64
3673 if (!UseCompressedOops || !UseCompressedClassPointers) {
3674 vm_exit_during_initialization(
3675 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3676 }
3677 } else {
3678 if (!UseCompressedOops || !UseCompressedClassPointers) {
3679 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3680 }
3681 #endif
3682 }
3683 }
3684
3685 // Sharing support
3686 // Construct the path to the archive
3687 static char* get_shared_archive_path() {
3688 char *shared_archive_path;
3689 if (SharedArchiveFile == NULL) {
3690 char jvm_path[JVM_MAXPATHLEN];
3691 os::jvm_path(jvm_path, sizeof(jvm_path));
3692 char *end = strrchr(jvm_path, *os::file_separator());
3693 if (end != NULL) *end = '\0';
3694 size_t jvm_path_len = strlen(jvm_path);
3695 size_t file_sep_len = strlen(os::file_separator());
3696 const size_t len = jvm_path_len + file_sep_len + 20;
3697 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3698 if (shared_archive_path != NULL) {
3699 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3700 jvm_path, os::file_separator());
3701 }
3702 } else {
3703 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3704 }
3705 return shared_archive_path;
3706 }
3707
3708 #ifndef PRODUCT
3709 // Determine whether LogVMOutput should be implicitly turned on.
3710 static bool use_vm_log() {
3711 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3712 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3713 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3714 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3715 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3716 return true;
3717 }
3718
3719 #ifdef COMPILER1
3720 if (PrintC1Statistics) {
3721 return true;
3722 }
3723 #endif // COMPILER1
3724
3725 #ifdef COMPILER2
3726 if (PrintOptoAssembly || PrintOptoStatistics) {
3727 return true;
3728 }
3729 #endif // COMPILER2
3730
3731 return false;
3732 }
3733
3734 #endif // PRODUCT
3735
3736 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3737 for (int index = 0; index < args->nOptions; index++) {
3738 const JavaVMOption* option = args->options + index;
3739 const char* tail;
3740 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3741 return true;
3742 }
3743 }
3744 return false;
3745 }
3746
3747 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3748 const char* vm_options_file,
3749 const int vm_options_file_pos,
3750 ScopedVMInitArgs* vm_options_file_args,
3751 ScopedVMInitArgs* args_out) {
3752 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3753 if (code != JNI_OK) {
3754 return code;
3755 }
3756
3757 if (vm_options_file_args->get()->nOptions < 1) {
3758 return JNI_OK;
3759 }
3760
3761 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3762 jio_fprintf(defaultStream::error_stream(),
3763 "A VM options file may not refer to a VM options file. "
3764 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3765 "options file '%s' in options container '%s' is an error.\n",
3766 vm_options_file_args->vm_options_file_arg(),
3767 vm_options_file_args->container_name());
3768 return JNI_EINVAL;
3769 }
3770
3771 return args_out->insert(args, vm_options_file_args->get(),
3772 vm_options_file_pos);
3773 }
3774
3775 // Expand -XX:VMOptionsFile found in args_in as needed.
3776 // mod_args and args_out parameters may return values as needed.
3777 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3778 ScopedVMInitArgs* mod_args,
3779 JavaVMInitArgs** args_out) {
3780 jint code = match_special_option_and_act(args_in, mod_args);
3781 if (code != JNI_OK) {
3782 return code;
3783 }
3784
3785 if (mod_args->is_set()) {
3786 // args_in contains -XX:VMOptionsFile and mod_args contains the
3787 // original options from args_in along with the options expanded
3788 // from the VMOptionsFile. Return a short-hand to the caller.
3789 *args_out = mod_args->get();
3790 } else {
3791 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3792 }
3793 return JNI_OK;
3794 }
3795
3796 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3797 ScopedVMInitArgs* args_out) {
3798 // Remaining part of option string
3799 const char* tail;
3800 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3801
3802 for (int index = 0; index < args->nOptions; index++) {
3803 const JavaVMOption* option = args->options + index;
3804 if (ArgumentsExt::process_options(option)) {
3805 continue;
3806 }
3807 if (match_option(option, "-XX:Flags=", &tail)) {
3808 Arguments::set_jvm_flags_file(tail);
3809 continue;
3810 }
3811 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3812 if (vm_options_file_args.found_vm_options_file_arg()) {
3813 jio_fprintf(defaultStream::error_stream(),
3814 "The option '%s' is already specified in the options "
3815 "container '%s' so the specification of '%s' in the "
3816 "same options container is an error.\n",
3817 vm_options_file_args.vm_options_file_arg(),
3818 vm_options_file_args.container_name(),
3819 option->optionString);
3820 return JNI_EINVAL;
3821 }
3822 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3823 // If there's a VMOptionsFile, parse that
3824 jint code = insert_vm_options_file(args, tail, index,
3825 &vm_options_file_args, args_out);
3826 if (code != JNI_OK) {
3827 return code;
3828 }
3829 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3830 if (args_out->is_set()) {
3831 // The VMOptions file inserted some options so switch 'args'
3832 // to the new set of options, and continue processing which
3833 // preserves "last option wins" semantics.
3834 args = args_out->get();
3835 // The first option from the VMOptionsFile replaces the
3836 // current option. So we back track to process the
3837 // replacement option.
3838 index--;
3839 }
3840 continue;
3841 }
3842 if (match_option(option, "-XX:+PrintVMOptions")) {
3843 PrintVMOptions = true;
3844 continue;
3845 }
3846 if (match_option(option, "-XX:-PrintVMOptions")) {
3847 PrintVMOptions = false;
3848 continue;
3849 }
3850 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3851 IgnoreUnrecognizedVMOptions = true;
3852 continue;
3853 }
3854 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3855 IgnoreUnrecognizedVMOptions = false;
3856 continue;
3857 }
3858 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3859 CommandLineFlags::printFlags(tty, false);
3860 vm_exit(0);
3861 }
3862 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3863 #if INCLUDE_NMT
3864 // The launcher did not setup nmt environment variable properly.
3865 if (!MemTracker::check_launcher_nmt_support(tail)) {
3866 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3867 }
3868
3869 // Verify if nmt option is valid.
3870 if (MemTracker::verify_nmt_option()) {
3871 // Late initialization, still in single-threaded mode.
3872 if (MemTracker::tracking_level() >= NMT_summary) {
3873 MemTracker::init();
3874 }
3875 } else {
3876 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3877 }
3878 continue;
3879 #else
3880 jio_fprintf(defaultStream::error_stream(),
3881 "Native Memory Tracking is not supported in this VM\n");
3882 return JNI_ERR;
3883 #endif
3884 }
3885
3886 #ifndef PRODUCT
3887 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3888 CommandLineFlags::printFlags(tty, true);
3889 vm_exit(0);
3890 }
3891 #endif
3892
3893 if (match_option(option, "-XX:+UseAppCDS")) {
3894 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
3895 if (flag->is_diagnostic()) {
3896 flag->clear_diagnostic();
3897 }
3898 continue;
3899 }
3900 }
3901 return JNI_OK;
3902 }
3903
3904 static void print_options(const JavaVMInitArgs *args) {
3905 const char* tail;
3906 for (int index = 0; index < args->nOptions; index++) {
3907 const JavaVMOption *option = args->options + index;
3908 if (match_option(option, "-XX:", &tail)) {
3909 logOption(tail);
3910 }
3911 }
3912 }
3913
3914 bool Arguments::handle_deprecated_print_gc_flags() {
3915 if (PrintGC) {
3916 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3917 }
3918 if (PrintGCDetails) {
3919 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3920 }
3921
3922 if (_gc_log_filename != NULL) {
3923 // -Xloggc was used to specify a filename
3924 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3925
3926 LogTarget(Error, logging) target;
3927 LogStream errstream(target);
3928 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3929 } else if (PrintGC || PrintGCDetails) {
3930 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3931 }
3932 return true;
3933 }
3934
3935 void Arguments::handle_extra_cms_flags(const char* msg) {
3936 SpecialFlag flag;
3937 const char *flag_name = "UseConcMarkSweepGC";
3938 if (lookup_special_flag(flag_name, flag)) {
3939 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3940 warning("%s", msg);
3941 }
3942 }
3943
3944 // Parse entry point called from JNI_CreateJavaVM
3945
3946 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3947 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3948
3949 // Initialize ranges, constraints and writeables
3950 CommandLineFlagRangeList::init();
3951 CommandLineFlagConstraintList::init();
3952 CommandLineFlagWriteableList::init();
3953
3954 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3955 const char* hotspotrc = ".hotspotrc";
3956 bool settings_file_specified = false;
3957 bool needs_hotspotrc_warning = false;
3958 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3959 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3960
3961 // Pointers to current working set of containers
3962 JavaVMInitArgs* cur_cmd_args;
3963 JavaVMInitArgs* cur_java_options_args;
3964 JavaVMInitArgs* cur_java_tool_options_args;
3965
3966 // Containers for modified/expanded options
3967 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3968 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3969 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3970
3971
3972 jint code =
3973 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3974 if (code != JNI_OK) {
3975 return code;
3976 }
3977
3978 code = parse_java_options_environment_variable(&initial_java_options_args);
3979 if (code != JNI_OK) {
3980 return code;
3981 }
3982
3983 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3984 &mod_java_tool_options_args,
3985 &cur_java_tool_options_args);
3986 if (code != JNI_OK) {
3987 return code;
3988 }
3989
3990 code = expand_vm_options_as_needed(initial_cmd_args,
3991 &mod_cmd_args,
3992 &cur_cmd_args);
3993 if (code != JNI_OK) {
3994 return code;
3995 }
3996
3997 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3998 &mod_java_options_args,
3999 &cur_java_options_args);
4000 if (code != JNI_OK) {
4001 return code;
4002 }
4003
4004 const char* flags_file = Arguments::get_jvm_flags_file();
4005 settings_file_specified = (flags_file != NULL);
4006
4007 if (IgnoreUnrecognizedVMOptions) {
4008 cur_cmd_args->ignoreUnrecognized = true;
4009 cur_java_tool_options_args->ignoreUnrecognized = true;
4010 cur_java_options_args->ignoreUnrecognized = true;
4011 }
4012
4013 // Parse specified settings file
4014 if (settings_file_specified) {
4015 if (!process_settings_file(flags_file, true,
4016 cur_cmd_args->ignoreUnrecognized)) {
4017 return JNI_EINVAL;
4018 }
4019 } else {
4020 #ifdef ASSERT
4021 // Parse default .hotspotrc settings file
4022 if (!process_settings_file(".hotspotrc", false,
4023 cur_cmd_args->ignoreUnrecognized)) {
4024 return JNI_EINVAL;
4025 }
4026 #else
4027 struct stat buf;
4028 if (os::stat(hotspotrc, &buf) == 0) {
4029 needs_hotspotrc_warning = true;
4030 }
4031 #endif
4032 }
4033
4034 if (PrintVMOptions) {
4035 print_options(cur_java_tool_options_args);
4036 print_options(cur_cmd_args);
4037 print_options(cur_java_options_args);
4038 }
4039
4040 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4041 jint result = parse_vm_init_args(cur_java_tool_options_args,
4042 cur_java_options_args,
4043 cur_cmd_args);
4044
4045 if (result != JNI_OK) {
4046 return result;
4047 }
4048
4049 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4050 SharedArchivePath = get_shared_archive_path();
4051 if (SharedArchivePath == NULL) {
4052 return JNI_ENOMEM;
4053 }
4054
4055 // Set up VerifySharedSpaces
4056 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4057 VerifySharedSpaces = true;
4058 }
4059
4060 // Delay warning until here so that we've had a chance to process
4061 // the -XX:-PrintWarnings flag
4062 if (needs_hotspotrc_warning) {
4063 warning("%s file is present but has been ignored. "
4064 "Run with -XX:Flags=%s to load the file.",
4065 hotspotrc, hotspotrc);
4066 }
4067
4068 if (needs_module_property_warning) {
4069 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4070 " names that are reserved for internal use.");
4071 }
4072
4073 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4074 UNSUPPORTED_OPTION(UseLargePages);
4075 #endif
4076
4077 ArgumentsExt::report_unsupported_options();
4078
4079 #ifndef PRODUCT
4080 if (TraceBytecodesAt != 0) {
4081 TraceBytecodes = true;
4082 }
4083 if (CountCompiledCalls) {
4084 if (UseCounterDecay) {
4085 warning("UseCounterDecay disabled because CountCalls is set");
4086 UseCounterDecay = false;
4087 }
4088 }
4089 #endif // PRODUCT
4090
4091 if (ScavengeRootsInCode == 0) {
4092 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4093 warning("Forcing ScavengeRootsInCode non-zero");
4094 }
4095 ScavengeRootsInCode = 1;
4096 }
4097
4098 if (!handle_deprecated_print_gc_flags()) {
4099 return JNI_EINVAL;
4100 }
4101
4102 // Set object alignment values.
4103 set_object_alignment();
4104
4105 #if !INCLUDE_CDS
4106 if (DumpSharedSpaces || RequireSharedSpaces) {
4107 jio_fprintf(defaultStream::error_stream(),
4108 "Shared spaces are not supported in this VM\n");
4109 return JNI_ERR;
4110 }
4111 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4112 log_is_enabled(Info, cds)) {
4113 warning("Shared spaces are not supported in this VM");
4114 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4115 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4116 }
4117 no_shared_spaces("CDS Disabled");
4118 #endif // INCLUDE_CDS
4119
4120 return JNI_OK;
4121 }
4122
4123 jint Arguments::apply_ergo() {
4124 // Set flags based on ergonomics.
4125 jint result = set_ergonomics_flags();
4126 if (result != JNI_OK) return result;
4127
4128 #if INCLUDE_JVMCI
4129 set_jvmci_specific_flags();
4130 #endif
4131
4132 set_shared_spaces_flags();
4133
4134 if (TieredCompilation) {
4135 set_tiered_flags();
4136 } else {
4137 int max_compilation_policy_choice = 1;
4138 #ifdef COMPILER2
4139 if (is_server_compilation_mode_vm()) {
4140 max_compilation_policy_choice = 2;
4141 }
4142 #endif
4143 // Check if the policy is valid.
4144 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4145 vm_exit_during_initialization(
4146 "Incompatible compilation policy selected", NULL);
4147 }
4148 // Scale CompileThreshold
4149 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4150 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4151 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4152 }
4153 }
4154
4155 #ifdef COMPILER2
4156 #ifndef PRODUCT
4157 if (PrintIdealGraphLevel > 0) {
4158 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4159 }
4160 #endif
4161 #endif
4162
4163 // Set heap size based on available physical memory
4164 set_heap_size();
4165
4166 GCConfig::arguments()->initialize();
4167
4168 // Initialize Metaspace flags and alignments
4169 Metaspace::ergo_initialize();
4170
4171 // Set bytecode rewriting flags
4172 set_bytecode_flags();
4173
4174 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4175 jint code = set_aggressive_opts_flags();
4176 if (code != JNI_OK) {
4177 return code;
4178 }
4179
4180 // Turn off biased locking for locking debug mode flags,
4181 // which are subtly different from each other but neither works with
4182 // biased locking
4183 if (UseHeavyMonitors
4184 #ifdef COMPILER1
4185 || !UseFastLocking
4186 #endif // COMPILER1
4187 #if INCLUDE_JVMCI
4188 || !JVMCIUseFastLocking
4189 #endif
4190 ) {
4191 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4192 // flag set to true on command line; warn the user that they
4193 // can't enable biased locking here
4194 warning("Biased Locking is not supported with locking debug flags"
4195 "; ignoring UseBiasedLocking flag." );
4196 }
4197 UseBiasedLocking = false;
4198 }
4199
4200 #ifdef CC_INTERP
4201 // Clear flags not supported on zero.
4202 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4203 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4204 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4205 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4206 #endif // CC_INTERP
4207
4208 #ifdef COMPILER2
4209 if (!EliminateLocks) {
4210 EliminateNestedLocks = false;
4211 }
4212 if (!Inline) {
4213 IncrementalInline = false;
4214 }
4215 #ifndef PRODUCT
4216 if (!IncrementalInline) {
4217 AlwaysIncrementalInline = false;
4218 }
4219 #endif
4220 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4221 // nothing to use the profiling, turn if off
4222 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4223 }
4224 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
4225 // blind guess
4226 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
4227 }
4228 #endif
4229
4230 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4231 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4232 DebugNonSafepoints = true;
4233 }
4234
4235 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4236 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4237 }
4238
4239 if (UseOnStackReplacement && !UseLoopCounter) {
4240 warning("On-stack-replacement requires loop counters; enabling loop counters");
4241 FLAG_SET_DEFAULT(UseLoopCounter, true);
4242 }
4243
4244 #ifndef PRODUCT
4245 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4246 if (use_vm_log()) {
4247 LogVMOutput = true;
4248 }
4249 }
4250 #endif // PRODUCT
4251
4252 if (PrintCommandLineFlags) {
4253 CommandLineFlags::printSetFlags(tty);
4254 }
4255
4256 // Apply CPU specific policy for the BiasedLocking
4257 if (UseBiasedLocking) {
4258 if (!VM_Version::use_biased_locking() &&
4259 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4260 UseBiasedLocking = false;
4261 }
4262 }
4263 #ifdef COMPILER2
4264 if (!UseBiasedLocking || EmitSync != 0) {
4265 UseOptoBiasInlining = false;
4266 }
4267 #endif
4268
4269 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4270 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4271 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4272 } else {
4273 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4274 }
4275
4276 return JNI_OK;
4277 }
4278
4279 jint Arguments::adjust_after_os() {
4280 if (UseNUMA) {
4281 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4282 FLAG_SET_ERGO(bool, UseNUMA, false);
4283 } else if (UseParallelGC || UseParallelOldGC) {
4284 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4285 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4286 }
4287 }
4288 // UseNUMAInterleaving is set to ON for all collectors and
4289 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4290 // such as the parallel collector for Linux and Solaris will
4291 // interleave old gen and survivor spaces on top of NUMA
4292 // allocation policy for the eden space.
4293 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4294 // all platforms and ParallelGC on Windows will interleave all
4295 // of the heap spaces across NUMA nodes.
4296 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4297 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4298 }
4299 }
4300 return JNI_OK;
4301 }
4302
4303 int Arguments::PropertyList_count(SystemProperty* pl) {
4304 int count = 0;
4305 while(pl != NULL) {
4306 count++;
4307 pl = pl->next();
4308 }
4309 return count;
4310 }
4311
4312 // Return the number of readable properties.
4313 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4314 int count = 0;
4315 while(pl != NULL) {
4316 if (pl->is_readable()) {
4317 count++;
4318 }
4319 pl = pl->next();
4320 }
4321 return count;
4322 }
4323
4324 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4325 assert(key != NULL, "just checking");
4326 SystemProperty* prop;
4327 for (prop = pl; prop != NULL; prop = prop->next()) {
4328 if (strcmp(key, prop->key()) == 0) return prop->value();
4329 }
4330 return NULL;
4331 }
4332
4333 // Return the value of the requested property provided that it is a readable property.
4334 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4335 assert(key != NULL, "just checking");
4336 SystemProperty* prop;
4337 // Return the property value if the keys match and the property is not internal or
4338 // it's the special internal property "jdk.boot.class.path.append".
4339 for (prop = pl; prop != NULL; prop = prop->next()) {
4340 if (strcmp(key, prop->key()) == 0) {
4341 if (!prop->internal()) {
4342 return prop->value();
4343 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4344 return prop->value();
4345 } else {
4346 // Property is internal and not jdk.boot.class.path.append so return NULL.
4347 return NULL;
4348 }
4349 }
4350 }
4351 return NULL;
4352 }
4353
4354 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4355 int count = 0;
4356 const char* ret_val = NULL;
4357
4358 while(pl != NULL) {
4359 if(count >= index) {
4360 ret_val = pl->key();
4361 break;
4362 }
4363 count++;
4364 pl = pl->next();
4365 }
4366
4367 return ret_val;
4368 }
4369
4370 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4371 int count = 0;
4372 char* ret_val = NULL;
4373
4374 while(pl != NULL) {
4375 if(count >= index) {
4376 ret_val = pl->value();
4377 break;
4378 }
4379 count++;
4380 pl = pl->next();
4381 }
4382
4383 return ret_val;
4384 }
4385
4386 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4387 SystemProperty* p = *plist;
4388 if (p == NULL) {
4389 *plist = new_p;
4390 } else {
4391 while (p->next() != NULL) {
4392 p = p->next();
4393 }
4394 p->set_next(new_p);
4395 }
4396 }
4397
4398 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4399 bool writeable, bool internal) {
4400 if (plist == NULL)
4401 return;
4402
4403 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4404 PropertyList_add(plist, new_p);
4405 }
4406
4407 void Arguments::PropertyList_add(SystemProperty *element) {
4408 PropertyList_add(&_system_properties, element);
4409 }
4410
4411 // This add maintains unique property key in the list.
4412 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4413 PropertyAppendable append, PropertyWriteable writeable,
4414 PropertyInternal internal) {
4415 if (plist == NULL)
4416 return;
4417
4418 // If property key exist then update with new value.
4419 SystemProperty* prop;
4420 for (prop = *plist; prop != NULL; prop = prop->next()) {
4421 if (strcmp(k, prop->key()) == 0) {
4422 if (append == AppendProperty) {
4423 prop->append_value(v);
4424 } else {
4425 prop->set_value(v);
4426 }
4427 return;
4428 }
4429 }
4430
4431 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4432 }
4433
4434 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4435 // Returns true if all of the source pointed by src has been copied over to
4436 // the destination buffer pointed by buf. Otherwise, returns false.
4437 // Notes:
4438 // 1. If the length (buflen) of the destination buffer excluding the
4439 // NULL terminator character is not long enough for holding the expanded
4440 // pid characters, it also returns false instead of returning the partially
4441 // expanded one.
4442 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4443 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4444 char* buf, size_t buflen) {
4445 const char* p = src;
4446 char* b = buf;
4447 const char* src_end = &src[srclen];
4448 char* buf_end = &buf[buflen - 1];
4449
4450 while (p < src_end && b < buf_end) {
4451 if (*p == '%') {
4452 switch (*(++p)) {
4453 case '%': // "%%" ==> "%"
4454 *b++ = *p++;
4455 break;
4456 case 'p': { // "%p" ==> current process id
4457 // buf_end points to the character before the last character so
4458 // that we could write '\0' to the end of the buffer.
4459 size_t buf_sz = buf_end - b + 1;
4460 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4461
4462 // if jio_snprintf fails or the buffer is not long enough to hold
4463 // the expanded pid, returns false.
4464 if (ret < 0 || ret >= (int)buf_sz) {
4465 return false;
4466 } else {
4467 b += ret;
4468 assert(*b == '\0', "fail in copy_expand_pid");
4469 if (p == src_end && b == buf_end + 1) {
4470 // reach the end of the buffer.
4471 return true;
4472 }
4473 }
4474 p++;
4475 break;
4476 }
4477 default :
4478 *b++ = '%';
4479 }
4480 } else {
4481 *b++ = *p++;
4482 }
4483 }
4484 *b = '\0';
4485 return (p == src_end); // return false if not all of the source was copied
4486 }