1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "logging/logStream.hpp"
39 #include "logging/logTag.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/universe.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64
65 // Note: This is a special bug reporting site for the JVM
66 #ifdef VENDOR_URL_VM_BUG
67 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
68 #else
69 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #endif
71 #define DEFAULT_JAVA_LAUNCHER "generic"
72
73 char* Arguments::_jvm_flags_file = NULL;
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 size_t Arguments::_conservative_max_heap_alignment = 0;
82 size_t Arguments::_min_heap_size = 0;
83 Arguments::Mode Arguments::_mode = _mixed;
84 bool Arguments::_java_compiler = false;
85 bool Arguments::_xdebug_mode = false;
86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
88 int Arguments::_sun_java_launcher_pid = -1;
89 bool Arguments::_sun_java_launcher_is_altjvm = false;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
116 PathString *Arguments::_system_boot_class_path = NULL;
117 bool Arguments::_has_jimage = false;
118
119 char* Arguments::_ext_dirs = NULL;
120
121 bool PathString::set_value(const char *value) {
122 if (_value != NULL) {
123 FreeHeap(_value);
124 }
125 _value = AllocateHeap(strlen(value)+1, mtArguments);
126 assert(_value != NULL, "Unable to allocate space for new path value");
127 if (_value != NULL) {
128 strcpy(_value, value);
129 } else {
130 // not able to allocate
131 return false;
132 }
133 return true;
134 }
135
136 void PathString::append_value(const char *value) {
137 char *sp;
138 size_t len = 0;
139 if (value != NULL) {
140 len = strlen(value);
141 if (_value != NULL) {
142 len += strlen(_value);
143 }
144 sp = AllocateHeap(len+2, mtArguments);
145 assert(sp != NULL, "Unable to allocate space for new append path value");
146 if (sp != NULL) {
147 if (_value != NULL) {
148 strcpy(sp, _value);
149 strcat(sp, os::path_separator());
150 strcat(sp, value);
151 FreeHeap(_value);
152 } else {
153 strcpy(sp, value);
154 }
155 _value = sp;
156 }
157 }
158 }
159
160 PathString::PathString(const char* value) {
161 if (value == NULL) {
162 _value = NULL;
163 } else {
164 _value = AllocateHeap(strlen(value)+1, mtArguments);
165 strcpy(_value, value);
166 }
167 }
168
169 PathString::~PathString() {
170 if (_value != NULL) {
171 FreeHeap(_value);
172 _value = NULL;
173 }
174 }
175
176 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
177 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
178 size_t len = strlen(module_name) + 1;
179 _module_name = AllocateHeap(len, mtInternal);
180 strncpy(_module_name, module_name, len); // copy the trailing null
181 _path = new PathString(path);
182 }
183
184 ModulePatchPath::~ModulePatchPath() {
185 if (_module_name != NULL) {
186 FreeHeap(_module_name);
187 _module_name = NULL;
188 }
189 if (_path != NULL) {
190 delete _path;
191 _path = NULL;
192 }
193 }
194
195 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
196 if (key == NULL) {
197 _key = NULL;
198 } else {
199 _key = AllocateHeap(strlen(key)+1, mtArguments);
200 strcpy(_key, key);
201 }
202 _next = NULL;
203 _internal = internal;
204 _writeable = writeable;
205 }
206
207 AgentLibrary::AgentLibrary(const char* name, const char* options,
208 bool is_absolute_path, void* os_lib,
209 bool instrument_lib) {
210 _name = AllocateHeap(strlen(name)+1, mtArguments);
211 strcpy(_name, name);
212 if (options == NULL) {
213 _options = NULL;
214 } else {
215 _options = AllocateHeap(strlen(options)+1, mtArguments);
216 strcpy(_options, options);
217 }
218 _is_absolute_path = is_absolute_path;
219 _os_lib = os_lib;
220 _next = NULL;
221 _state = agent_invalid;
222 _is_static_lib = false;
223 _is_instrument_lib = instrument_lib;
224 }
225
226 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
227 // part of the option string.
228 static bool match_option(const JavaVMOption *option, const char* name,
229 const char** tail) {
230 size_t len = strlen(name);
231 if (strncmp(option->optionString, name, len) == 0) {
232 *tail = option->optionString + len;
233 return true;
234 } else {
235 return false;
236 }
237 }
238
239 // Check if 'option' matches 'name'. No "tail" is allowed.
240 static bool match_option(const JavaVMOption *option, const char* name) {
241 const char* tail = NULL;
242 bool result = match_option(option, name, &tail);
243 if (tail != NULL && *tail == '\0') {
244 return result;
245 } else {
246 return false;
247 }
248 }
249
250 // Return true if any of the strings in null-terminated array 'names' matches.
251 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
252 // the option must match exactly.
253 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
254 bool tail_allowed) {
255 for (/* empty */; *names != NULL; ++names) {
256 if (match_option(option, *names, tail)) {
257 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
258 return true;
259 }
260 }
261 }
262 return false;
263 }
264
265 static void logOption(const char* opt) {
266 if (PrintVMOptions) {
267 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
268 }
269 }
270
271 bool needs_module_property_warning = false;
272
273 #define MODULE_PROPERTY_PREFIX "jdk.module."
274 #define MODULE_PROPERTY_PREFIX_LEN 11
275 #define ADDEXPORTS "addexports"
276 #define ADDEXPORTS_LEN 10
277 #define ADDREADS "addreads"
278 #define ADDREADS_LEN 8
279 #define ADDOPENS "addopens"
280 #define ADDOPENS_LEN 8
281 #define PATCH "patch"
282 #define PATCH_LEN 5
283 #define ADDMODS "addmods"
284 #define ADDMODS_LEN 7
285 #define LIMITMODS "limitmods"
286 #define LIMITMODS_LEN 9
287 #define PATH "path"
288 #define PATH_LEN 4
289 #define UPGRADE_PATH "upgrade.path"
290 #define UPGRADE_PATH_LEN 12
291
292 void Arguments::add_init_library(const char* name, char* options) {
293 _libraryList.add(new AgentLibrary(name, options, false, NULL));
294 }
295
296 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
297 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
298 }
299
300 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
301 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
302 }
303
304 // Late-binding agents not started via arguments
305 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
306 _agentList.add(agentLib);
307 }
308
309 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
310 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
311 }
312
313 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
314 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
315 return ((strncmp(option, property, len) == 0) &&
316 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
317 }
318
319 // Return true if property starts with "jdk.module." and its ensuing chars match
320 // any of the reserved module properties.
321 // property should be passed without the leading "-D".
322 bool Arguments::is_internal_module_property(const char* property) {
323 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
324 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
325 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
326 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
327 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
328 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
329 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
330 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
331 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
332 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
333 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
334 return true;
335 }
336 }
337 return false;
338 }
339
340 // Process java launcher properties.
341 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
342 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
343 // sun.java.launcher.pid is defined.
344 // Must do this before setting up other system properties,
345 // as some of them may depend on launcher type.
346 for (int index = 0; index < args->nOptions; index++) {
347 const JavaVMOption* option = args->options + index;
348 const char* tail;
349
350 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
351 process_java_launcher_argument(tail, option->extraInfo);
352 continue;
353 }
354 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
355 if (strcmp(tail, "true") == 0) {
356 _sun_java_launcher_is_altjvm = true;
357 }
358 continue;
359 }
360 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
361 _sun_java_launcher_pid = atoi(tail);
362 continue;
363 }
364 }
365 }
366
367 // Initialize system properties key and value.
368 void Arguments::init_system_properties() {
369
370 // Set up _system_boot_class_path which is not a property but
371 // relies heavily on argument processing and the jdk.boot.class.path.append
372 // property. It is used to store the underlying system boot class path.
373 _system_boot_class_path = new PathString(NULL);
374
375 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
376 "Java Virtual Machine Specification", false));
377 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
378 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
379 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
380 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
381
382 // Following are JVMTI agent writable properties.
383 // Properties values are set to NULL and they are
384 // os specific they are initialized in os::init_system_properties_values().
385 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
386 _java_library_path = new SystemProperty("java.library.path", NULL, true);
387 _java_home = new SystemProperty("java.home", NULL, true);
388 _java_class_path = new SystemProperty("java.class.path", "", true);
389 // jdk.boot.class.path.append is a non-writeable, internal property.
390 // It can only be set by either:
391 // - -Xbootclasspath/a:
392 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
393 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
394
395 // Add to System Property list.
396 PropertyList_add(&_system_properties, _sun_boot_library_path);
397 PropertyList_add(&_system_properties, _java_library_path);
398 PropertyList_add(&_system_properties, _java_home);
399 PropertyList_add(&_system_properties, _java_class_path);
400 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
401
402 // Set OS specific system properties values
403 os::init_system_properties_values();
404 }
405
406 // Update/Initialize System properties after JDK version number is known
407 void Arguments::init_version_specific_system_properties() {
408 enum { bufsz = 16 };
409 char buffer[bufsz];
410 const char* spec_vendor = "Oracle Corporation";
411 uint32_t spec_version = JDK_Version::current().major_version();
412
413 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
414
415 PropertyList_add(&_system_properties,
416 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
417 PropertyList_add(&_system_properties,
418 new SystemProperty("java.vm.specification.version", buffer, false));
419 PropertyList_add(&_system_properties,
420 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
421 }
422
423 /*
424 * -XX argument processing:
425 *
426 * -XX arguments are defined in several places, such as:
427 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
428 * -XX arguments are parsed in parse_argument().
429 * -XX argument bounds checking is done in check_vm_args_consistency().
430 *
431 * Over time -XX arguments may change. There are mechanisms to handle common cases:
432 *
433 * ALIASED: An option that is simply another name for another option. This is often
434 * part of the process of deprecating a flag, but not all aliases need
435 * to be deprecated.
436 *
437 * Create an alias for an option by adding the old and new option names to the
438 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
439 *
440 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
441 * support may be removed in the future. Both regular and aliased options may be
442 * deprecated.
443 *
444 * Add a deprecation warning for an option (or alias) by adding an entry in the
445 * "special_jvm_flags" table and setting the "deprecated_in" field.
446 * Often an option "deprecated" in one major release will
447 * be made "obsolete" in the next. In this case the entry should also have its
448 * "obsolete_in" field set.
449 *
450 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
451 * on the command line. A warning is printed to let the user know that option might not
452 * be accepted in the future.
453 *
454 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
455 * table and setting the "obsolete_in" field.
456 *
457 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
458 * to the current JDK version. The system will flatly refuse to admit the existence of
459 * the flag. This allows a flag to die automatically over JDK releases.
460 *
461 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
462 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
463 * - Newly obsolete or expired deprecated options should have their global variable
464 * definitions removed (from globals.hpp, etc) and related implementations removed.
465 *
466 * Recommended approach for removing options:
467 *
468 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
469 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
470 *
471 * To remove internal options (e.g. diagnostic, experimental, develop options), use
472 * a 2-step model adding major release numbers to the obsolete and expire columns.
473 *
474 * To change the name of an option, use the alias table as well as a 2-step
475 * model adding major release numbers to the deprecate and expire columns.
476 * Think twice about aliasing commonly used customer options.
477 *
478 * There are times when it is appropriate to leave a future release number as undefined.
479 *
480 * Tests: Aliases should be tested in VMAliasOptions.java.
481 * Deprecated options should be tested in VMDeprecatedOptions.java.
482 */
483
484 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
485 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
486 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
487 // the command-line as usual, but will issue a warning.
488 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
489 // the command-line, while issuing a warning and ignoring the flag value.
490 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
491 // existence of the flag.
492 //
493 // MANUAL CLEANUP ON JDK VERSION UPDATES:
494 // This table ensures that the handling of options will update automatically when the JDK
495 // version is incremented, but the source code needs to be cleanup up manually:
496 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
497 // variable should be removed, as well as users of the variable.
498 // - As "deprecated" options age into "obsolete" options, move the entry into the
499 // "Obsolete Flags" section of the table.
500 // - All expired options should be removed from the table.
501 static SpecialFlag const special_jvm_flags[] = {
502 // -------------- Deprecated Flags --------------
503 // --- Non-alias flags - sorted by obsolete_in then expired_in:
504 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
505 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
506 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
507 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
508 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
509 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
511 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
512 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
513 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
514 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
515 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
516 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
517 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
518 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
519
520 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
521 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
523 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
524 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
525
526 // -------------- Obsolete Flags - sorted by expired_in --------------
527 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
528 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
529 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
530 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
531 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
532 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
533 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
534 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
535 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
536 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
537 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
538 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
539 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
540 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
541 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
542
543 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
544 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
545 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
546 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
547 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
548 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
549 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
550 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
551 #endif
552
553 { NULL, JDK_Version(0), JDK_Version(0) }
554 };
555
556 // Flags that are aliases for other flags.
557 typedef struct {
558 const char* alias_name;
559 const char* real_name;
560 } AliasedFlag;
561
562 static AliasedFlag const aliased_jvm_flags[] = {
563 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
564 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
565 { NULL, NULL}
566 };
567
568 // NOTE: A compatibility request will be necessary for each alias to be removed.
569 static AliasedLoggingFlag const aliased_logging_flags[] = {
570 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
571 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
572 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
573 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
574 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
575 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
576 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
577 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
578 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
579 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
580 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
581 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
582 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
583 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
584 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
585 };
586
587 #ifndef PRODUCT
588 // These options are removed in jdk9. Remove this code for jdk10.
589 static AliasedFlag const removed_develop_logging_flags[] = {
590 { "TraceClassInitialization", "-Xlog:class+init" },
591 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
592 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
593 { "TraceItables", "-Xlog:itables=debug" },
594 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
595 { "TraceSafepoint", "-Xlog:safepoint=debug" },
596 { "TraceStartupTime", "-Xlog:startuptime" },
597 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
598 { "PrintVtables", "-Xlog:vtables=debug" },
599 { "VerboseVerification", "-Xlog:verification" },
600 { NULL, NULL }
601 };
602 #endif //PRODUCT
603
604 // Return true if "v" is less than "other", where "other" may be "undefined".
605 static bool version_less_than(JDK_Version v, JDK_Version other) {
606 assert(!v.is_undefined(), "must be defined");
607 if (!other.is_undefined() && v.compare(other) >= 0) {
608 return false;
609 } else {
610 return true;
611 }
612 }
613
614 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
615
616 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
617 // Allow extensions to have priority
618 if (lookup_special_flag_ext(flag_name, flag)) {
619 return true;
620 }
621
622 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
623 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
624 flag = special_jvm_flags[i];
625 return true;
626 }
627 }
628 return false;
629 }
630
631 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
632 assert(version != NULL, "Must provide a version buffer");
633 SpecialFlag flag;
634 if (lookup_special_flag(flag_name, flag)) {
635 if (!flag.obsolete_in.is_undefined()) {
636 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
637 *version = flag.obsolete_in;
638 return true;
639 }
640 }
641 }
642 return false;
643 }
644
645 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
646 assert(version != NULL, "Must provide a version buffer");
647 SpecialFlag flag;
648 if (lookup_special_flag(flag_name, flag)) {
649 if (!flag.deprecated_in.is_undefined()) {
650 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
651 version_less_than(JDK_Version::current(), flag.expired_in)) {
652 *version = flag.deprecated_in;
653 return 1;
654 } else {
655 return -1;
656 }
657 }
658 }
659 return 0;
660 }
661
662 #ifndef PRODUCT
663 const char* Arguments::removed_develop_logging_flag_name(const char* name){
664 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
665 const AliasedFlag& flag = removed_develop_logging_flags[i];
666 if (strcmp(flag.alias_name, name) == 0) {
667 return flag.real_name;
668 }
669 }
670 return NULL;
671 }
672 #endif // PRODUCT
673
674 const char* Arguments::real_flag_name(const char *flag_name) {
675 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
676 const AliasedFlag& flag_status = aliased_jvm_flags[i];
677 if (strcmp(flag_status.alias_name, flag_name) == 0) {
678 return flag_status.real_name;
679 }
680 }
681 return flag_name;
682 }
683
684 #ifdef ASSERT
685 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
686 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
687 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
688 return true;
689 }
690 }
691 return false;
692 }
693
694 // Verifies the correctness of the entries in the special_jvm_flags table.
695 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
696 // version being earlier than the deprecation version, then a warning is issued
697 // and verification fails - by returning false. If it is detected that the table
698 // is out of date, with respect to the current version, then a warning is issued
699 // but verification does not fail. This allows the VM to operate when the version
700 // is first updated, without needing to update all the impacted flags at the
701 // same time.
702 static bool verify_special_jvm_flags() {
703 bool success = true;
704 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
705 const SpecialFlag& flag = special_jvm_flags[i];
706 if (lookup_special_flag(flag.name, i)) {
707 warning("Duplicate special flag declaration \"%s\"", flag.name);
708 success = false;
709 }
710 if (flag.deprecated_in.is_undefined() &&
711 flag.obsolete_in.is_undefined()) {
712 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
713 success = false;
714 }
715
716 if (!flag.deprecated_in.is_undefined()) {
717 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
718 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
719 success = false;
720 }
721
722 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
723 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
724 success = false;
725 }
726 }
727
728 if (!flag.obsolete_in.is_undefined()) {
729 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
730 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
731 success = false;
732 }
733
734 // if flag has become obsolete it should not have a "globals" flag defined anymore.
735 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
736 if (Flag::find_flag(flag.name) != NULL) {
737 // Temporarily disable the warning: 8196739
738 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
739 }
740 }
741 }
742
743 if (!flag.expired_in.is_undefined()) {
744 // if flag has become expired it should not have a "globals" flag defined anymore.
745 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
746 if (Flag::find_flag(flag.name) != NULL) {
747 // Temporarily disable the warning: 8196739
748 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
749 }
750 }
751 }
752
753 }
754 return success;
755 }
756 #endif
757
758 // Parses a size specification string.
759 bool Arguments::atojulong(const char *s, julong* result) {
760 julong n = 0;
761
762 // First char must be a digit. Don't allow negative numbers or leading spaces.
763 if (!isdigit(*s)) {
764 return false;
765 }
766
767 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
768 char* remainder;
769 errno = 0;
770 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
771 if (errno != 0) {
772 return false;
773 }
774
775 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
776 if (remainder == s || strlen(remainder) > 1) {
777 return false;
778 }
779
780 switch (*remainder) {
781 case 'T': case 't':
782 *result = n * G * K;
783 // Check for overflow.
784 if (*result/((julong)G * K) != n) return false;
785 return true;
786 case 'G': case 'g':
787 *result = n * G;
788 if (*result/G != n) return false;
789 return true;
790 case 'M': case 'm':
791 *result = n * M;
792 if (*result/M != n) return false;
793 return true;
794 case 'K': case 'k':
795 *result = n * K;
796 if (*result/K != n) return false;
797 return true;
798 case '\0':
799 *result = n;
800 return true;
801 default:
802 return false;
803 }
804 }
805
806 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
807 if (size < min_size) return arg_too_small;
808 if (size > max_size) return arg_too_big;
809 return arg_in_range;
810 }
811
812 // Describe an argument out of range error
813 void Arguments::describe_range_error(ArgsRange errcode) {
814 switch(errcode) {
815 case arg_too_big:
816 jio_fprintf(defaultStream::error_stream(),
817 "The specified size exceeds the maximum "
818 "representable size.\n");
819 break;
820 case arg_too_small:
821 case arg_unreadable:
822 case arg_in_range:
823 // do nothing for now
824 break;
825 default:
826 ShouldNotReachHere();
827 }
828 }
829
830 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
831 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
832 return true;
833 } else {
834 return false;
835 }
836 }
837
838 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
839 char* end;
840 errno = 0;
841 double v = strtod(value, &end);
842 if ((errno != 0) || (*end != 0)) {
843 return false;
844 }
845
846 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
847 return true;
848 }
849 return false;
850 }
851
852 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
853 julong v;
854 int int_v;
855 intx intx_v;
856 bool is_neg = false;
857 Flag* result = Flag::find_flag(name, strlen(name));
858
859 if (result == NULL) {
860 return false;
861 }
862
863 // Check the sign first since atojulong() parses only unsigned values.
864 if (*value == '-') {
865 if (!result->is_intx() && !result->is_int()) {
866 return false;
867 }
868 value++;
869 is_neg = true;
870 }
871 if (!Arguments::atojulong(value, &v)) {
872 return false;
873 }
874 if (result->is_int()) {
875 int_v = (int) v;
876 if (is_neg) {
877 int_v = -int_v;
878 }
879 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
880 } else if (result->is_uint()) {
881 uint uint_v = (uint) v;
882 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
883 } else if (result->is_intx()) {
884 intx_v = (intx) v;
885 if (is_neg) {
886 intx_v = -intx_v;
887 }
888 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
889 } else if (result->is_uintx()) {
890 uintx uintx_v = (uintx) v;
891 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
892 } else if (result->is_uint64_t()) {
893 uint64_t uint64_t_v = (uint64_t) v;
894 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
895 } else if (result->is_size_t()) {
896 size_t size_t_v = (size_t) v;
897 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
898 } else if (result->is_double()) {
899 double double_v = (double) v;
900 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
901 } else {
902 return false;
903 }
904 }
905
906 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
907 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
908 // Contract: CommandLineFlags always returns a pointer that needs freeing.
909 FREE_C_HEAP_ARRAY(char, value);
910 return true;
911 }
912
913 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
914 const char* old_value = "";
915 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
916 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
917 size_t new_len = strlen(new_value);
918 const char* value;
919 char* free_this_too = NULL;
920 if (old_len == 0) {
921 value = new_value;
922 } else if (new_len == 0) {
923 value = old_value;
924 } else {
925 size_t length = old_len + 1 + new_len + 1;
926 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
927 // each new setting adds another LINE to the switch:
928 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
929 value = buf;
930 free_this_too = buf;
931 }
932 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
933 // CommandLineFlags always returns a pointer that needs freeing.
934 FREE_C_HEAP_ARRAY(char, value);
935 if (free_this_too != NULL) {
936 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
937 FREE_C_HEAP_ARRAY(char, free_this_too);
938 }
939 return true;
940 }
941
942 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
943 const char* real_name = real_flag_name(arg);
944 JDK_Version since = JDK_Version();
945 switch (is_deprecated_flag(arg, &since)) {
946 case -1:
947 return NULL; // obsolete or expired, don't process normally
948 case 0:
949 return real_name;
950 case 1: {
951 if (warn) {
952 char version[256];
953 since.to_string(version, sizeof(version));
954 if (real_name != arg) {
955 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
956 arg, version, real_name);
957 } else {
958 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
959 arg, version);
960 }
961 }
962 return real_name;
963 }
964 }
965 ShouldNotReachHere();
966 return NULL;
967 }
968
969 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
970 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
971 // Set tagset string buffer at max size of 256, large enough for any alias tagset
972 const int max_tagset_size = 256;
973 int max_tagset_len = max_tagset_size - 1;
974 char tagset_buffer[max_tagset_size];
975 tagset_buffer[0] = '\0';
976
977 // Write tag-set for aliased logging option, in string list form
978 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
979 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
980 if (i > 0) {
981 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
982 }
983 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
984 }
985 if (!alf.exactMatch) {
986 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
987 }
988 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
989 (on) ? "+" : "-",
990 name,
991 tagset_buffer,
992 (on) ? LogLevel::name(alf.level) : "off");
993 }
994
995 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
996 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
997 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
998 if (strcmp(alf.alias_name, name) == 0) {
999 log_deprecated_flag(name, on, alf);
1000 return alf;
1001 }
1002 }
1003 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1004 return a;
1005 }
1006
1007 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1008
1009 // range of acceptable characters spelled out for portability reasons
1010 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1011 #define BUFLEN 255
1012 char name[BUFLEN+1];
1013 char dummy;
1014 const char* real_name;
1015 bool warn_if_deprecated = true;
1016
1017 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1018 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1019 if (alf.alias_name != NULL){
1020 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1021 return true;
1022 }
1023 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1024 if (real_name == NULL) {
1025 return false;
1026 }
1027 return set_bool_flag(real_name, false, origin);
1028 }
1029 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1030 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1031 if (alf.alias_name != NULL){
1032 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1033 return true;
1034 }
1035 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1036 if (real_name == NULL) {
1037 return false;
1038 }
1039 return set_bool_flag(real_name, true, origin);
1040 }
1041
1042 char punct;
1043 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1044 const char* value = strchr(arg, '=') + 1;
1045 Flag* flag;
1046
1047 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1048 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1049 if (alf.alias_name != NULL) {
1050 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1051 return true;
1052 }
1053 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1054 if (real_name == NULL) {
1055 return false;
1056 }
1057 flag = Flag::find_flag(real_name);
1058 if (flag != NULL && flag->is_ccstr()) {
1059 if (flag->ccstr_accumulates()) {
1060 return append_to_string_flag(real_name, value, origin);
1061 } else {
1062 if (value[0] == '\0') {
1063 value = NULL;
1064 }
1065 return set_string_flag(real_name, value, origin);
1066 }
1067 } else {
1068 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1069 }
1070 }
1071
1072 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1073 const char* value = strchr(arg, '=') + 1;
1074 // -XX:Foo:=xxx will reset the string flag to the given value.
1075 if (value[0] == '\0') {
1076 value = NULL;
1077 }
1078 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1079 if (real_name == NULL) {
1080 return false;
1081 }
1082 return set_string_flag(real_name, value, origin);
1083 }
1084
1085 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1086 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1087 #define NUMBER_RANGE "[0123456789eE+-]"
1088 char value[BUFLEN + 1];
1089 char value2[BUFLEN + 1];
1090 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1091 // Looks like a floating-point number -- try again with more lenient format string
1092 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1093 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1094 if (real_name == NULL) {
1095 return false;
1096 }
1097 return set_fp_numeric_flag(real_name, value, origin);
1098 }
1099 }
1100
1101 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1102 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1103 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1104 if (real_name == NULL) {
1105 return false;
1106 }
1107 return set_numeric_flag(real_name, value, origin);
1108 }
1109
1110 return false;
1111 }
1112
1113 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1114 assert(bldarray != NULL, "illegal argument");
1115
1116 if (arg == NULL) {
1117 return;
1118 }
1119
1120 int new_count = *count + 1;
1121
1122 // expand the array and add arg to the last element
1123 if (*bldarray == NULL) {
1124 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1125 } else {
1126 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1127 }
1128 (*bldarray)[*count] = os::strdup_check_oom(arg);
1129 *count = new_count;
1130 }
1131
1132 void Arguments::build_jvm_args(const char* arg) {
1133 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1134 }
1135
1136 void Arguments::build_jvm_flags(const char* arg) {
1137 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1138 }
1139
1140 // utility function to return a string that concatenates all
1141 // strings in a given char** array
1142 const char* Arguments::build_resource_string(char** args, int count) {
1143 if (args == NULL || count == 0) {
1144 return NULL;
1145 }
1146 size_t length = 0;
1147 for (int i = 0; i < count; i++) {
1148 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1149 }
1150 char* s = NEW_RESOURCE_ARRAY(char, length);
1151 char* dst = s;
1152 for (int j = 0; j < count; j++) {
1153 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1154 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1155 dst += offset;
1156 length -= offset;
1157 }
1158 return (const char*) s;
1159 }
1160
1161 void Arguments::print_on(outputStream* st) {
1162 st->print_cr("VM Arguments:");
1163 if (num_jvm_flags() > 0) {
1164 st->print("jvm_flags: "); print_jvm_flags_on(st);
1165 st->cr();
1166 }
1167 if (num_jvm_args() > 0) {
1168 st->print("jvm_args: "); print_jvm_args_on(st);
1169 st->cr();
1170 }
1171 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1172 if (_java_class_path != NULL) {
1173 char* path = _java_class_path->value();
1174 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1175 }
1176 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1177 }
1178
1179 void Arguments::print_summary_on(outputStream* st) {
1180 // Print the command line. Environment variables that are helpful for
1181 // reproducing the problem are written later in the hs_err file.
1182 // flags are from setting file
1183 if (num_jvm_flags() > 0) {
1184 st->print_raw("Settings File: ");
1185 print_jvm_flags_on(st);
1186 st->cr();
1187 }
1188 // args are the command line and environment variable arguments.
1189 st->print_raw("Command Line: ");
1190 if (num_jvm_args() > 0) {
1191 print_jvm_args_on(st);
1192 }
1193 // this is the classfile and any arguments to the java program
1194 if (java_command() != NULL) {
1195 st->print("%s", java_command());
1196 }
1197 st->cr();
1198 }
1199
1200 void Arguments::print_jvm_flags_on(outputStream* st) {
1201 if (_num_jvm_flags > 0) {
1202 for (int i=0; i < _num_jvm_flags; i++) {
1203 st->print("%s ", _jvm_flags_array[i]);
1204 }
1205 }
1206 }
1207
1208 void Arguments::print_jvm_args_on(outputStream* st) {
1209 if (_num_jvm_args > 0) {
1210 for (int i=0; i < _num_jvm_args; i++) {
1211 st->print("%s ", _jvm_args_array[i]);
1212 }
1213 }
1214 }
1215
1216 bool Arguments::process_argument(const char* arg,
1217 jboolean ignore_unrecognized,
1218 Flag::Flags origin) {
1219 JDK_Version since = JDK_Version();
1220
1221 if (parse_argument(arg, origin)) {
1222 return true;
1223 }
1224
1225 // Determine if the flag has '+', '-', or '=' characters.
1226 bool has_plus_minus = (*arg == '+' || *arg == '-');
1227 const char* const argname = has_plus_minus ? arg + 1 : arg;
1228
1229 size_t arg_len;
1230 const char* equal_sign = strchr(argname, '=');
1231 if (equal_sign == NULL) {
1232 arg_len = strlen(argname);
1233 } else {
1234 arg_len = equal_sign - argname;
1235 }
1236
1237 // Only make the obsolete check for valid arguments.
1238 if (arg_len <= BUFLEN) {
1239 // Construct a string which consists only of the argument name without '+', '-', or '='.
1240 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1241 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1242 if (is_obsolete_flag(stripped_argname, &since)) {
1243 char version[256];
1244 since.to_string(version, sizeof(version));
1245 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1246 return true;
1247 }
1248 #ifndef PRODUCT
1249 else {
1250 const char* replacement;
1251 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1252 log_warning(arguments)("%s has been removed. Please use %s instead.",
1253 stripped_argname,
1254 replacement);
1255 return false;
1256 }
1257 }
1258 #endif //PRODUCT
1259 }
1260
1261 // For locked flags, report a custom error message if available.
1262 // Otherwise, report the standard unrecognized VM option.
1263 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1264 if (found_flag != NULL) {
1265 char locked_message_buf[BUFLEN];
1266 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1267 if (strlen(locked_message_buf) == 0) {
1268 if (found_flag->is_bool() && !has_plus_minus) {
1269 jio_fprintf(defaultStream::error_stream(),
1270 "Missing +/- setting for VM option '%s'\n", argname);
1271 } else if (!found_flag->is_bool() && has_plus_minus) {
1272 jio_fprintf(defaultStream::error_stream(),
1273 "Unexpected +/- setting in VM option '%s'\n", argname);
1274 } else {
1275 jio_fprintf(defaultStream::error_stream(),
1276 "Improperly specified VM option '%s'\n", argname);
1277 }
1278 } else {
1279 #ifdef PRODUCT
1280 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1281 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1282 if (ignore_unrecognized && mismatched) {
1283 return true;
1284 }
1285 #endif
1286 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1287 }
1288 } else {
1289 if (ignore_unrecognized) {
1290 return true;
1291 }
1292 jio_fprintf(defaultStream::error_stream(),
1293 "Unrecognized VM option '%s'\n", argname);
1294 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1295 if (fuzzy_matched != NULL) {
1296 jio_fprintf(defaultStream::error_stream(),
1297 "Did you mean '%s%s%s'? ",
1298 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1299 fuzzy_matched->_name,
1300 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1301 }
1302 }
1303
1304 // allow for commandline "commenting out" options like -XX:#+Verbose
1305 return arg[0] == '#';
1306 }
1307
1308 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1309 FILE* stream = fopen(file_name, "rb");
1310 if (stream == NULL) {
1311 if (should_exist) {
1312 jio_fprintf(defaultStream::error_stream(),
1313 "Could not open settings file %s\n", file_name);
1314 return false;
1315 } else {
1316 return true;
1317 }
1318 }
1319
1320 char token[1024];
1321 int pos = 0;
1322
1323 bool in_white_space = true;
1324 bool in_comment = false;
1325 bool in_quote = false;
1326 char quote_c = 0;
1327 bool result = true;
1328
1329 int c = getc(stream);
1330 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1331 if (in_white_space) {
1332 if (in_comment) {
1333 if (c == '\n') in_comment = false;
1334 } else {
1335 if (c == '#') in_comment = true;
1336 else if (!isspace(c)) {
1337 in_white_space = false;
1338 token[pos++] = c;
1339 }
1340 }
1341 } else {
1342 if (c == '\n' || (!in_quote && isspace(c))) {
1343 // token ends at newline, or at unquoted whitespace
1344 // this allows a way to include spaces in string-valued options
1345 token[pos] = '\0';
1346 logOption(token);
1347 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1348 build_jvm_flags(token);
1349 pos = 0;
1350 in_white_space = true;
1351 in_quote = false;
1352 } else if (!in_quote && (c == '\'' || c == '"')) {
1353 in_quote = true;
1354 quote_c = c;
1355 } else if (in_quote && (c == quote_c)) {
1356 in_quote = false;
1357 } else {
1358 token[pos++] = c;
1359 }
1360 }
1361 c = getc(stream);
1362 }
1363 if (pos > 0) {
1364 token[pos] = '\0';
1365 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1366 build_jvm_flags(token);
1367 }
1368 fclose(stream);
1369 return result;
1370 }
1371
1372 //=============================================================================================================
1373 // Parsing of properties (-D)
1374
1375 const char* Arguments::get_property(const char* key) {
1376 return PropertyList_get_value(system_properties(), key);
1377 }
1378
1379 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1380 const char* eq = strchr(prop, '=');
1381 const char* key;
1382 const char* value = "";
1383
1384 if (eq == NULL) {
1385 // property doesn't have a value, thus use passed string
1386 key = prop;
1387 } else {
1388 // property have a value, thus extract it and save to the
1389 // allocated string
1390 size_t key_len = eq - prop;
1391 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1392
1393 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1394 key = tmp_key;
1395
1396 value = &prop[key_len + 1];
1397 }
1398
1399 if (strcmp(key, "java.compiler") == 0) {
1400 process_java_compiler_argument(value);
1401 // Record value in Arguments, but let it get passed to Java.
1402 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1403 strcmp(key, "sun.java.launcher.pid") == 0) {
1404 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1405 // private and are processed in process_sun_java_launcher_properties();
1406 // the sun.java.launcher property is passed on to the java application
1407 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1408 // append is true, writable is true, internal is false
1409 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1410 WriteableProperty, ExternalProperty);
1411 } else {
1412 if (strcmp(key, "sun.java.command") == 0) {
1413 char *old_java_command = _java_command;
1414 _java_command = os::strdup_check_oom(value, mtArguments);
1415 if (old_java_command != NULL) {
1416 os::free(old_java_command);
1417 }
1418 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1419 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1420 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1421 // its value without going through the property list or making a Java call.
1422 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1423 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1424 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1425 os::free((void *)old_java_vendor_url_bug);
1426 }
1427 }
1428
1429 // Create new property and add at the end of the list
1430 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1431 }
1432
1433 if (key != prop) {
1434 // SystemProperty copy passed value, thus free previously allocated
1435 // memory
1436 FreeHeap((void *)key);
1437 }
1438
1439 return true;
1440 }
1441
1442 #if INCLUDE_CDS
1443 void Arguments::check_unsupported_dumping_properties() {
1444 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1445 const char* unsupported_properties[] = { "jdk.module.main",
1446 "jdk.module.limitmods",
1447 "jdk.module.path",
1448 "jdk.module.upgrade.path",
1449 "jdk.module.patch.0" };
1450 const char* unsupported_options[] = { "-m", // cannot use at dump time
1451 "--limit-modules", // ignored at dump time
1452 "--module-path", // ignored at dump time
1453 "--upgrade-module-path", // ignored at dump time
1454 "--patch-module" // ignored at dump time
1455 };
1456 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1457 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1458 // vm will exit with an error message. Otherwise, it will print an informational message if
1459 // -Xlog:cds is enabled.
1460 uint info_idx = 1;
1461 SystemProperty* sp = system_properties();
1462 while (sp != NULL) {
1463 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1464 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1465 if (i < info_idx) {
1466 vm_exit_during_initialization(
1467 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1468 } else {
1469 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1470 unsupported_options[i]);
1471 }
1472 }
1473 }
1474 sp = sp->next();
1475 }
1476
1477 // Check for an exploded module build in use with -Xshare:dump.
1478 if (!has_jimage()) {
1479 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1480 }
1481 }
1482 #endif
1483
1484 //===========================================================================================================
1485 // Setting int/mixed/comp mode flags
1486
1487 void Arguments::set_mode_flags(Mode mode) {
1488 // Set up default values for all flags.
1489 // If you add a flag to any of the branches below,
1490 // add a default value for it here.
1491 set_java_compiler(false);
1492 _mode = mode;
1493
1494 // Ensure Agent_OnLoad has the correct initial values.
1495 // This may not be the final mode; mode may change later in onload phase.
1496 PropertyList_unique_add(&_system_properties, "java.vm.info",
1497 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1498
1499 UseInterpreter = true;
1500 UseCompiler = true;
1501 UseLoopCounter = true;
1502
1503 // Default values may be platform/compiler dependent -
1504 // use the saved values
1505 ClipInlining = Arguments::_ClipInlining;
1506 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1507 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1508 BackgroundCompilation = Arguments::_BackgroundCompilation;
1509 if (TieredCompilation) {
1510 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1511 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1512 }
1513 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1514 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1515 }
1516 }
1517
1518 // Change from defaults based on mode
1519 switch (mode) {
1520 default:
1521 ShouldNotReachHere();
1522 break;
1523 case _int:
1524 UseCompiler = false;
1525 UseLoopCounter = false;
1526 AlwaysCompileLoopMethods = false;
1527 UseOnStackReplacement = false;
1528 break;
1529 case _mixed:
1530 // same as default
1531 break;
1532 case _comp:
1533 UseInterpreter = false;
1534 BackgroundCompilation = false;
1535 ClipInlining = false;
1536 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1537 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1538 // compile a level 4 (C2) and then continue executing it.
1539 if (TieredCompilation) {
1540 Tier3InvokeNotifyFreqLog = 0;
1541 Tier4InvocationThreshold = 0;
1542 }
1543 break;
1544 }
1545 }
1546
1547 // Conflict: required to use shared spaces (-Xshare:on), but
1548 // incompatible command line options were chosen.
1549 static void no_shared_spaces(const char* message) {
1550 if (RequireSharedSpaces) {
1551 jio_fprintf(defaultStream::error_stream(),
1552 "Class data sharing is inconsistent with other specified options.\n");
1553 vm_exit_during_initialization("Unable to use shared archive.", message);
1554 } else {
1555 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1556 }
1557 }
1558
1559 // Returns threshold scaled with the value of scale.
1560 // If scale < 0.0, threshold is returned without scaling.
1561 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1562 if (scale == 1.0 || scale < 0.0) {
1563 return threshold;
1564 } else {
1565 return (intx)(threshold * scale);
1566 }
1567 }
1568
1569 // Returns freq_log scaled with the value of scale.
1570 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1571 // If scale < 0.0, freq_log is returned without scaling.
1572 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1573 // Check if scaling is necessary or if negative value was specified.
1574 if (scale == 1.0 || scale < 0.0) {
1575 return freq_log;
1576 }
1577 // Check values to avoid calculating log2 of 0.
1578 if (scale == 0.0 || freq_log == 0) {
1579 return 0;
1580 }
1581 // Determine the maximum notification frequency value currently supported.
1582 // The largest mask value that the interpreter/C1 can handle is
1583 // of length InvocationCounter::number_of_count_bits. Mask values are always
1584 // one bit shorter then the value of the notification frequency. Set
1585 // max_freq_bits accordingly.
1586 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1587 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1588 if (scaled_freq == 0) {
1589 // Return 0 right away to avoid calculating log2 of 0.
1590 return 0;
1591 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1592 return max_freq_bits;
1593 } else {
1594 return log2_intptr(scaled_freq);
1595 }
1596 }
1597
1598 void Arguments::set_tiered_flags() {
1599 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1600 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1601 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1602 }
1603 if (CompilationPolicyChoice < 2) {
1604 vm_exit_during_initialization(
1605 "Incompatible compilation policy selected", NULL);
1606 }
1607 // Increase the code cache size - tiered compiles a lot more.
1608 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1609 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1610 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1611 }
1612 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1613 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1614 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1615 }
1616 if (!UseInterpreter) { // -Xcomp
1617 Tier3InvokeNotifyFreqLog = 0;
1618 Tier4InvocationThreshold = 0;
1619 }
1620
1621 if (CompileThresholdScaling < 0) {
1622 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1623 }
1624
1625 // Scale tiered compilation thresholds.
1626 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1627 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1628 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1629 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1630
1631 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1632 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1633 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1634 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1635
1636 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1637 // once these thresholds become supported.
1638
1639 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1640 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1641
1642 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1643 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1644
1645 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1646
1647 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1648 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1649 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1650 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1651 }
1652 }
1653
1654 void set_object_alignment() {
1655 // Object alignment.
1656 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1657 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1658 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1659 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1660 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1661 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1662
1663 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1664 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1665
1666 // Oop encoding heap max
1667 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1668
1669 if (SurvivorAlignmentInBytes == 0) {
1670 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1671 }
1672 }
1673
1674 size_t Arguments::max_heap_for_compressed_oops() {
1675 // Avoid sign flip.
1676 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1677 // We need to fit both the NULL page and the heap into the memory budget, while
1678 // keeping alignment constraints of the heap. To guarantee the latter, as the
1679 // NULL page is located before the heap, we pad the NULL page to the conservative
1680 // maximum alignment that the GC may ever impose upon the heap.
1681 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1682 _conservative_max_heap_alignment);
1683
1684 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1685 NOT_LP64(ShouldNotReachHere(); return 0);
1686 }
1687
1688 void Arguments::set_use_compressed_oops() {
1689 #ifndef ZERO
1690 #ifdef _LP64
1691 // MaxHeapSize is not set up properly at this point, but
1692 // the only value that can override MaxHeapSize if we are
1693 // to use UseCompressedOops is InitialHeapSize.
1694 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1695
1696 if (max_heap_size <= max_heap_for_compressed_oops()) {
1697 #if !defined(COMPILER1) || defined(TIERED)
1698 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1699 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1700 }
1701 #endif
1702 } else {
1703 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1704 warning("Max heap size too large for Compressed Oops");
1705 FLAG_SET_DEFAULT(UseCompressedOops, false);
1706 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1707 }
1708 }
1709 #endif // _LP64
1710 #endif // ZERO
1711 }
1712
1713
1714 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1715 // set_use_compressed_oops().
1716 void Arguments::set_use_compressed_klass_ptrs() {
1717 #ifndef ZERO
1718 #ifdef _LP64
1719 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1720 if (!UseCompressedOops) {
1721 if (UseCompressedClassPointers) {
1722 warning("UseCompressedClassPointers requires UseCompressedOops");
1723 }
1724 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1725 } else {
1726 // Turn on UseCompressedClassPointers too
1727 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1728 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1729 }
1730 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1731 if (UseCompressedClassPointers) {
1732 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1733 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1734 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1735 }
1736 }
1737 }
1738 #endif // _LP64
1739 #endif // !ZERO
1740 }
1741
1742 void Arguments::set_conservative_max_heap_alignment() {
1743 // The conservative maximum required alignment for the heap is the maximum of
1744 // the alignments imposed by several sources: any requirements from the heap
1745 // itself, the collector policy and the maximum page size we may run the VM
1746 // with.
1747 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1748 _conservative_max_heap_alignment = MAX4(heap_alignment,
1749 (size_t)os::vm_allocation_granularity(),
1750 os::max_page_size(),
1751 CollectorPolicy::compute_heap_alignment());
1752 }
1753
1754 #ifdef TIERED
1755 bool Arguments::compilation_mode_selected() {
1756 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1757 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1758
1759 }
1760
1761 void Arguments::select_compilation_mode_ergonomically() {
1762 #if defined(_WINDOWS) && !defined(_LP64)
1763 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1764 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1765 }
1766 #endif
1767 if (NeverActAsServerClassMachine) {
1768 set_client_compilation_mode();
1769 }
1770 }
1771 #endif //TIERED
1772
1773 #if INCLUDE_JVMCI
1774 void Arguments::set_jvmci_specific_flags() {
1775 if (UseJVMCICompiler) {
1776 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1777 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1778 }
1779 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1780 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1781 }
1782 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1783 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1784 }
1785 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1786 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1787 }
1788 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1789 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1790 }
1791 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1792 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1793 }
1794 if (TieredStopAtLevel != CompLevel_full_optimization) {
1795 // Currently JVMCI compiler can only work at the full optimization level
1796 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1797 TieredStopAtLevel = CompLevel_full_optimization;
1798 }
1799 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1800 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1801 }
1802 }
1803 }
1804 #endif
1805
1806 jint Arguments::set_ergonomics_flags() {
1807 #ifdef TIERED
1808 if (!compilation_mode_selected()) {
1809 select_compilation_mode_ergonomically();
1810 }
1811 #endif
1812
1813 jint gc_result = GCArguments::initialize();
1814 if (gc_result != JNI_OK) {
1815 return gc_result;
1816 }
1817
1818 #if COMPILER2_OR_JVMCI
1819 // Shared spaces work fine with other GCs but causes bytecode rewriting
1820 // to be disabled, which hurts interpreter performance and decreases
1821 // server performance. When -server is specified, keep the default off
1822 // unless it is asked for. Future work: either add bytecode rewriting
1823 // at link time, or rewrite bytecodes in non-shared methods.
1824 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1825 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1826 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1827 }
1828 #endif
1829
1830 #if defined(IA32)
1831 // Only server compiler can optimize safepoints well enough.
1832 if (!is_server_compilation_mode_vm()) {
1833 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1834 }
1835 #endif
1836
1837 set_conservative_max_heap_alignment();
1838
1839 #ifndef ZERO
1840 #ifdef _LP64
1841 set_use_compressed_oops();
1842
1843 // set_use_compressed_klass_ptrs() must be called after calling
1844 // set_use_compressed_oops().
1845 set_use_compressed_klass_ptrs();
1846
1847 // Also checks that certain machines are slower with compressed oops
1848 // in vm_version initialization code.
1849 #endif // _LP64
1850 #endif // !ZERO
1851
1852 return JNI_OK;
1853 }
1854
1855 void Arguments::set_gc_specific_flags() {
1856 // Set GC flags
1857 GCArguments::arguments()->initialize_flags();
1858 }
1859
1860 julong Arguments::limit_by_allocatable_memory(julong limit) {
1861 julong max_allocatable;
1862 julong result = limit;
1863 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1864 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1865 }
1866 return result;
1867 }
1868
1869 // Use static initialization to get the default before parsing
1870 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1871
1872 void Arguments::set_heap_size() {
1873 julong phys_mem =
1874 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1875 : (julong)MaxRAM;
1876
1877 // Convert deprecated flags
1878 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1879 !FLAG_IS_DEFAULT(MaxRAMFraction))
1880 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1881
1882 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1883 !FLAG_IS_DEFAULT(MinRAMFraction))
1884 MinRAMPercentage = 100.0 / MinRAMFraction;
1885
1886 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1887 !FLAG_IS_DEFAULT(InitialRAMFraction))
1888 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1889
1890 // If the maximum heap size has not been set with -Xmx,
1891 // then set it as fraction of the size of physical memory,
1892 // respecting the maximum and minimum sizes of the heap.
1893 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1894 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1895 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1896 if (reasonable_min < MaxHeapSize) {
1897 // Small physical memory, so use a minimum fraction of it for the heap
1898 reasonable_max = reasonable_min;
1899 } else {
1900 // Not-small physical memory, so require a heap at least
1901 // as large as MaxHeapSize
1902 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1903 }
1904
1905 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1906 // Limit the heap size to ErgoHeapSizeLimit
1907 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1908 }
1909 if (UseCompressedOops) {
1910 // Limit the heap size to the maximum possible when using compressed oops
1911 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1912
1913 // HeapBaseMinAddress can be greater than default but not less than.
1914 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1915 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1916 // matches compressed oops printing flags
1917 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1918 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1919 DefaultHeapBaseMinAddress,
1920 DefaultHeapBaseMinAddress/G,
1921 HeapBaseMinAddress);
1922 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1923 }
1924 }
1925
1926 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1927 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1928 // but it should be not less than default MaxHeapSize.
1929 max_coop_heap -= HeapBaseMinAddress;
1930 }
1931 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1932 }
1933 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1934
1935 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1936 // An initial heap size was specified on the command line,
1937 // so be sure that the maximum size is consistent. Done
1938 // after call to limit_by_allocatable_memory because that
1939 // method might reduce the allocation size.
1940 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1941 }
1942
1943 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1944 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1945 }
1946
1947 // If the minimum or initial heap_size have not been set or requested to be set
1948 // ergonomically, set them accordingly.
1949 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1950 julong reasonable_minimum = (julong)(OldSize + NewSize);
1951
1952 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1953
1954 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1955
1956 if (InitialHeapSize == 0) {
1957 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1958
1959 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1960 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1961
1962 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1963
1964 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1965 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1966 }
1967 // If the minimum heap size has not been set (via -Xms),
1968 // synchronize with InitialHeapSize to avoid errors with the default value.
1969 if (min_heap_size() == 0) {
1970 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1971 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1972 }
1973 }
1974 }
1975
1976 // This option inspects the machine and attempts to set various
1977 // parameters to be optimal for long-running, memory allocation
1978 // intensive jobs. It is intended for machines with large
1979 // amounts of cpu and memory.
1980 jint Arguments::set_aggressive_heap_flags() {
1981 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1982 // VM, but we may not be able to represent the total physical memory
1983 // available (like having 8gb of memory on a box but using a 32bit VM).
1984 // Thus, we need to make sure we're using a julong for intermediate
1985 // calculations.
1986 julong initHeapSize;
1987 julong total_memory = os::physical_memory();
1988
1989 if (total_memory < (julong) 256 * M) {
1990 jio_fprintf(defaultStream::error_stream(),
1991 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1992 vm_exit(1);
1993 }
1994
1995 // The heap size is half of available memory, or (at most)
1996 // all of possible memory less 160mb (leaving room for the OS
1997 // when using ISM). This is the maximum; because adaptive sizing
1998 // is turned on below, the actual space used may be smaller.
1999
2000 initHeapSize = MIN2(total_memory / (julong) 2,
2001 total_memory - (julong) 160 * M);
2002
2003 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2004
2005 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2006 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2007 return JNI_EINVAL;
2008 }
2009 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2010 return JNI_EINVAL;
2011 }
2012 // Currently the minimum size and the initial heap sizes are the same.
2013 set_min_heap_size(initHeapSize);
2014 }
2015 if (FLAG_IS_DEFAULT(NewSize)) {
2016 // Make the young generation 3/8ths of the total heap.
2017 if (FLAG_SET_CMDLINE(size_t, NewSize,
2018 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2019 return JNI_EINVAL;
2020 }
2021 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2022 return JNI_EINVAL;
2023 }
2024 }
2025
2026 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2027 FLAG_SET_DEFAULT(UseLargePages, true);
2028 #endif
2029
2030 // Increase some data structure sizes for efficiency
2031 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2032 return JNI_EINVAL;
2033 }
2034 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2035 return JNI_EINVAL;
2036 }
2037 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2038 return JNI_EINVAL;
2039 }
2040
2041 // See the OldPLABSize comment below, but replace 'after promotion'
2042 // with 'after copying'. YoungPLABSize is the size of the survivor
2043 // space per-gc-thread buffers. The default is 4kw.
2044 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2045 return JNI_EINVAL;
2046 }
2047
2048 // OldPLABSize is the size of the buffers in the old gen that
2049 // UseParallelGC uses to promote live data that doesn't fit in the
2050 // survivor spaces. At any given time, there's one for each gc thread.
2051 // The default size is 1kw. These buffers are rarely used, since the
2052 // survivor spaces are usually big enough. For specjbb, however, there
2053 // are occasions when there's lots of live data in the young gen
2054 // and we end up promoting some of it. We don't have a definite
2055 // explanation for why bumping OldPLABSize helps, but the theory
2056 // is that a bigger PLAB results in retaining something like the
2057 // original allocation order after promotion, which improves mutator
2058 // locality. A minor effect may be that larger PLABs reduce the
2059 // number of PLAB allocation events during gc. The value of 8kw
2060 // was arrived at by experimenting with specjbb.
2061 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2062 return JNI_EINVAL;
2063 }
2064
2065 // Enable parallel GC and adaptive generation sizing
2066 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2067 return JNI_EINVAL;
2068 }
2069
2070 // Encourage steady state memory management
2071 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2072 return JNI_EINVAL;
2073 }
2074
2075 // This appears to improve mutator locality
2076 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2077 return JNI_EINVAL;
2078 }
2079
2080 // Get around early Solaris scheduling bug
2081 // (affinity vs other jobs on system)
2082 // but disallow DR and offlining (5008695).
2083 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2084 return JNI_EINVAL;
2085 }
2086
2087 return JNI_OK;
2088 }
2089
2090 // This must be called after ergonomics.
2091 void Arguments::set_bytecode_flags() {
2092 if (!RewriteBytecodes) {
2093 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2094 }
2095 }
2096
2097 // Aggressive optimization flags -XX:+AggressiveOpts
2098 jint Arguments::set_aggressive_opts_flags() {
2099 #ifdef COMPILER2
2100 if (AggressiveUnboxing) {
2101 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2102 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2103 } else if (!EliminateAutoBox) {
2104 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2105 AggressiveUnboxing = false;
2106 }
2107 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2108 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2109 } else if (!DoEscapeAnalysis) {
2110 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2111 AggressiveUnboxing = false;
2112 }
2113 }
2114 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2115 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2116 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2117 }
2118 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2119 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2120 }
2121
2122 // Feed the cache size setting into the JDK
2123 char buffer[1024];
2124 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2125 if (!add_property(buffer)) {
2126 return JNI_ENOMEM;
2127 }
2128 }
2129 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2130 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2131 }
2132 #endif
2133
2134 if (AggressiveOpts) {
2135 // Sample flag setting code
2136 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2137 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2138 // }
2139 }
2140
2141 return JNI_OK;
2142 }
2143
2144 //===========================================================================================================
2145 // Parsing of java.compiler property
2146
2147 void Arguments::process_java_compiler_argument(const char* arg) {
2148 // For backwards compatibility, Djava.compiler=NONE or ""
2149 // causes us to switch to -Xint mode UNLESS -Xdebug
2150 // is also specified.
2151 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2152 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2153 }
2154 }
2155
2156 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2157 _sun_java_launcher = os::strdup_check_oom(launcher);
2158 }
2159
2160 bool Arguments::created_by_java_launcher() {
2161 assert(_sun_java_launcher != NULL, "property must have value");
2162 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2163 }
2164
2165 bool Arguments::sun_java_launcher_is_altjvm() {
2166 return _sun_java_launcher_is_altjvm;
2167 }
2168
2169 //===========================================================================================================
2170 // Parsing of main arguments
2171
2172 #if INCLUDE_JVMCI
2173 // Check consistency of jvmci vm argument settings.
2174 bool Arguments::check_jvmci_args_consistency() {
2175 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2176 }
2177 #endif //INCLUDE_JVMCI
2178
2179 // Check consistency of GC selection
2180 bool Arguments::check_gc_consistency() {
2181 // Ensure that the user has not selected conflicting sets
2182 // of collectors.
2183 uint i = 0;
2184 if (UseSerialGC) i++;
2185 if (UseConcMarkSweepGC) i++;
2186 if (UseParallelGC || UseParallelOldGC) i++;
2187 if (UseG1GC) i++;
2188 if (i > 1) {
2189 jio_fprintf(defaultStream::error_stream(),
2190 "Conflicting collector combinations in option list; "
2191 "please refer to the release notes for the combinations "
2192 "allowed\n");
2193 return false;
2194 }
2195
2196 return true;
2197 }
2198
2199 // Check the consistency of vm_init_args
2200 bool Arguments::check_vm_args_consistency() {
2201 // Method for adding checks for flag consistency.
2202 // The intent is to warn the user of all possible conflicts,
2203 // before returning an error.
2204 // Note: Needs platform-dependent factoring.
2205 bool status = true;
2206
2207 if (TLABRefillWasteFraction == 0) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "TLABRefillWasteFraction should be a denominator, "
2210 "not " SIZE_FORMAT "\n",
2211 TLABRefillWasteFraction);
2212 status = false;
2213 }
2214
2215 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2216 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2217 }
2218
2219 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2220 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2221 }
2222
2223 if (GCTimeLimit == 100) {
2224 // Turn off gc-overhead-limit-exceeded checks
2225 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2226 }
2227
2228 status = status && check_gc_consistency();
2229
2230 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2231 // insists that we hold the requisite locks so that the iteration is
2232 // MT-safe. For the verification at start-up and shut-down, we don't
2233 // yet have a good way of acquiring and releasing these locks,
2234 // which are not visible at the CollectedHeap level. We want to
2235 // be able to acquire these locks and then do the iteration rather
2236 // than just disable the lock verification. This will be fixed under
2237 // bug 4788986.
2238 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2239 if (VerifyDuringStartup) {
2240 warning("Heap verification at start-up disabled "
2241 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2242 VerifyDuringStartup = false; // Disable verification at start-up
2243 }
2244
2245 if (VerifyBeforeExit) {
2246 warning("Heap verification at shutdown disabled "
2247 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2248 VerifyBeforeExit = false; // Disable verification at shutdown
2249 }
2250 }
2251
2252 if (PrintNMTStatistics) {
2253 #if INCLUDE_NMT
2254 if (MemTracker::tracking_level() == NMT_off) {
2255 #endif // INCLUDE_NMT
2256 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2257 PrintNMTStatistics = false;
2258 #if INCLUDE_NMT
2259 }
2260 #endif
2261 }
2262
2263 #if INCLUDE_JVMCI
2264 status = status && check_jvmci_args_consistency();
2265
2266 if (EnableJVMCI) {
2267 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2268 AddProperty, UnwriteableProperty, InternalProperty);
2269
2270 if (!ScavengeRootsInCode) {
2271 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2272 ScavengeRootsInCode = 1;
2273 }
2274 }
2275 #endif
2276
2277 // Check lower bounds of the code cache
2278 // Template Interpreter code is approximately 3X larger in debug builds.
2279 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2280 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2281 jio_fprintf(defaultStream::error_stream(),
2282 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2283 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2284 status = false;
2285 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2288 min_code_cache_size/K);
2289 status = false;
2290 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2291 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2292 jio_fprintf(defaultStream::error_stream(),
2293 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2294 CODE_CACHE_SIZE_LIMIT/M);
2295 status = false;
2296 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2297 jio_fprintf(defaultStream::error_stream(),
2298 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2299 min_code_cache_size/K);
2300 status = false;
2301 }
2302
2303 #ifdef _LP64
2304 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2305 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2306 }
2307 #endif
2308
2309 #ifndef SUPPORT_RESERVED_STACK_AREA
2310 if (StackReservedPages != 0) {
2311 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2312 warning("Reserved Stack Area not supported on this platform");
2313 }
2314 #endif
2315
2316 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2317 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2318 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2319 }
2320 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2321 }
2322 if (UseCompiler && is_interpreter_only()) {
2323 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2324 warning("UseCompiler disabled due to -Xint.");
2325 }
2326 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2327 }
2328 #ifdef COMPILER2
2329 if (PostLoopMultiversioning && !RangeCheckElimination) {
2330 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2331 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2332 }
2333 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2334 }
2335 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2336 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2337 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2338 }
2339 LoopStripMiningIter = 1;
2340 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2341 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2342 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2343 }
2344 LoopStripMiningIter = 0;
2345 }
2346 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2347 // blind guess
2348 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2349 }
2350 #endif
2351 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2352 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2353 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2354 }
2355 }
2356 return status;
2357 }
2358
2359 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2360 const char* option_type) {
2361 if (ignore) return false;
2362
2363 const char* spacer = " ";
2364 if (option_type == NULL) {
2365 option_type = ++spacer; // Set both to the empty string.
2366 }
2367
2368 if (os::obsolete_option(option)) {
2369 jio_fprintf(defaultStream::error_stream(),
2370 "Obsolete %s%soption: %s\n", option_type, spacer,
2371 option->optionString);
2372 return false;
2373 } else {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Unrecognized %s%soption: %s\n", option_type, spacer,
2376 option->optionString);
2377 return true;
2378 }
2379 }
2380
2381 static const char* user_assertion_options[] = {
2382 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2383 };
2384
2385 static const char* system_assertion_options[] = {
2386 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2387 };
2388
2389 bool Arguments::parse_uintx(const char* value,
2390 uintx* uintx_arg,
2391 uintx min_size) {
2392
2393 // Check the sign first since atojulong() parses only unsigned values.
2394 bool value_is_positive = !(*value == '-');
2395
2396 if (value_is_positive) {
2397 julong n;
2398 bool good_return = atojulong(value, &n);
2399 if (good_return) {
2400 bool above_minimum = n >= min_size;
2401 bool value_is_too_large = n > max_uintx;
2402
2403 if (above_minimum && !value_is_too_large) {
2404 *uintx_arg = n;
2405 return true;
2406 }
2407 }
2408 }
2409 return false;
2410 }
2411
2412 unsigned int addreads_count = 0;
2413 unsigned int addexports_count = 0;
2414 unsigned int addopens_count = 0;
2415 unsigned int addmods_count = 0;
2416 unsigned int patch_mod_count = 0;
2417
2418 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2419 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2420 char* property = AllocateHeap(prop_len, mtArguments);
2421 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2422 if (ret < 0 || ret >= (int)prop_len) {
2423 FreeHeap(property);
2424 return false;
2425 }
2426 bool added = add_property(property, UnwriteableProperty, internal);
2427 FreeHeap(property);
2428 return added;
2429 }
2430
2431 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2432 const unsigned int props_count_limit = 1000;
2433 const int max_digits = 3;
2434 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2435
2436 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2437 if (count < props_count_limit) {
2438 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2439 char* property = AllocateHeap(prop_len, mtArguments);
2440 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2441 if (ret < 0 || ret >= (int)prop_len) {
2442 FreeHeap(property);
2443 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2444 return false;
2445 }
2446 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2447 FreeHeap(property);
2448 return added;
2449 }
2450
2451 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2452 return false;
2453 }
2454
2455 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2456 julong* long_arg,
2457 julong min_size,
2458 julong max_size) {
2459 if (!atojulong(s, long_arg)) return arg_unreadable;
2460 return check_memory_size(*long_arg, min_size, max_size);
2461 }
2462
2463 // Parse JavaVMInitArgs structure
2464
2465 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2466 const JavaVMInitArgs *java_options_args,
2467 const JavaVMInitArgs *cmd_line_args) {
2468 bool patch_mod_javabase = false;
2469
2470 // Save default settings for some mode flags
2471 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2472 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2473 Arguments::_ClipInlining = ClipInlining;
2474 Arguments::_BackgroundCompilation = BackgroundCompilation;
2475 if (TieredCompilation) {
2476 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2477 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2478 }
2479
2480 // Setup flags for mixed which is the default
2481 set_mode_flags(_mixed);
2482
2483 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2484 // variable (if present).
2485 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2486 if (result != JNI_OK) {
2487 return result;
2488 }
2489
2490 // Parse args structure generated from the command line flags.
2491 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2492 if (result != JNI_OK) {
2493 return result;
2494 }
2495
2496 // Parse args structure generated from the _JAVA_OPTIONS environment
2497 // variable (if present) (mimics classic VM)
2498 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2499 if (result != JNI_OK) {
2500 return result;
2501 }
2502
2503 // We need to ensure processor and memory resources have been properly
2504 // configured - which may rely on arguments we just processed - before
2505 // doing the final argument processing. Any argument processing that
2506 // needs to know about processor and memory resources must occur after
2507 // this point.
2508
2509 os::init_container_support();
2510
2511 // Do final processing now that all arguments have been parsed
2512 result = finalize_vm_init_args(patch_mod_javabase);
2513 if (result != JNI_OK) {
2514 return result;
2515 }
2516
2517 return JNI_OK;
2518 }
2519
2520 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2521 // represents a valid JDWP agent. is_path==true denotes that we
2522 // are dealing with -agentpath (case where name is a path), otherwise with
2523 // -agentlib
2524 bool valid_jdwp_agent(char *name, bool is_path) {
2525 char *_name;
2526 const char *_jdwp = "jdwp";
2527 size_t _len_jdwp, _len_prefix;
2528
2529 if (is_path) {
2530 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2531 return false;
2532 }
2533
2534 _name++; // skip past last path separator
2535 _len_prefix = strlen(JNI_LIB_PREFIX);
2536
2537 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2538 return false;
2539 }
2540
2541 _name += _len_prefix;
2542 _len_jdwp = strlen(_jdwp);
2543
2544 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2545 _name += _len_jdwp;
2546 }
2547 else {
2548 return false;
2549 }
2550
2551 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2552 return false;
2553 }
2554
2555 return true;
2556 }
2557
2558 if (strcmp(name, _jdwp) == 0) {
2559 return true;
2560 }
2561
2562 return false;
2563 }
2564
2565 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2566 // --patch-module=<module>=<file>(<pathsep><file>)*
2567 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2568 // Find the equal sign between the module name and the path specification
2569 const char* module_equal = strchr(patch_mod_tail, '=');
2570 if (module_equal == NULL) {
2571 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2572 return JNI_ERR;
2573 } else {
2574 // Pick out the module name
2575 size_t module_len = module_equal - patch_mod_tail;
2576 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2577 if (module_name != NULL) {
2578 memcpy(module_name, patch_mod_tail, module_len);
2579 *(module_name + module_len) = '\0';
2580 // The path piece begins one past the module_equal sign
2581 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2582 FREE_C_HEAP_ARRAY(char, module_name);
2583 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2584 return JNI_ENOMEM;
2585 }
2586 } else {
2587 return JNI_ENOMEM;
2588 }
2589 }
2590 return JNI_OK;
2591 }
2592
2593 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2594 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2595 // The min and max sizes match the values in globals.hpp, but scaled
2596 // with K. The values have been chosen so that alignment with page
2597 // size doesn't change the max value, which makes the conversions
2598 // back and forth between Xss value and ThreadStackSize value easier.
2599 // The values have also been chosen to fit inside a 32-bit signed type.
2600 const julong min_ThreadStackSize = 0;
2601 const julong max_ThreadStackSize = 1 * M;
2602
2603 const julong min_size = min_ThreadStackSize * K;
2604 const julong max_size = max_ThreadStackSize * K;
2605
2606 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2607
2608 julong size = 0;
2609 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2610 if (errcode != arg_in_range) {
2611 bool silent = (option == NULL); // Allow testing to silence error messages
2612 if (!silent) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Invalid thread stack size: %s\n", option->optionString);
2615 describe_range_error(errcode);
2616 }
2617 return JNI_EINVAL;
2618 }
2619
2620 // Internally track ThreadStackSize in units of 1024 bytes.
2621 const julong size_aligned = align_up(size, K);
2622 assert(size <= size_aligned,
2623 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2624 size, size_aligned);
2625
2626 const julong size_in_K = size_aligned / K;
2627 assert(size_in_K < (julong)max_intx,
2628 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2629 size_in_K);
2630
2631 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2632 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2633 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2634 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2635 max_expanded, size_in_K);
2636
2637 *out_ThreadStackSize = (intx)size_in_K;
2638
2639 return JNI_OK;
2640 }
2641
2642 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2643 // For match_option to return remaining or value part of option string
2644 const char* tail;
2645
2646 // iterate over arguments
2647 for (int index = 0; index < args->nOptions; index++) {
2648 bool is_absolute_path = false; // for -agentpath vs -agentlib
2649
2650 const JavaVMOption* option = args->options + index;
2651
2652 if (!match_option(option, "-Djava.class.path", &tail) &&
2653 !match_option(option, "-Dsun.java.command", &tail) &&
2654 !match_option(option, "-Dsun.java.launcher", &tail)) {
2655
2656 // add all jvm options to the jvm_args string. This string
2657 // is used later to set the java.vm.args PerfData string constant.
2658 // the -Djava.class.path and the -Dsun.java.command options are
2659 // omitted from jvm_args string as each have their own PerfData
2660 // string constant object.
2661 build_jvm_args(option->optionString);
2662 }
2663
2664 // -verbose:[class/module/gc/jni]
2665 if (match_option(option, "-verbose", &tail)) {
2666 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2667 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2668 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2669 } else if (!strcmp(tail, ":module")) {
2670 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2671 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2672 } else if (!strcmp(tail, ":gc")) {
2673 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2674 } else if (!strcmp(tail, ":jni")) {
2675 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 }
2679 // -da / -ea / -disableassertions / -enableassertions
2680 // These accept an optional class/package name separated by a colon, e.g.,
2681 // -da:java.lang.Thread.
2682 } else if (match_option(option, user_assertion_options, &tail, true)) {
2683 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2684 if (*tail == '\0') {
2685 JavaAssertions::setUserClassDefault(enable);
2686 } else {
2687 assert(*tail == ':', "bogus match by match_option()");
2688 JavaAssertions::addOption(tail + 1, enable);
2689 }
2690 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2691 } else if (match_option(option, system_assertion_options, &tail, false)) {
2692 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2693 JavaAssertions::setSystemClassDefault(enable);
2694 // -bootclasspath:
2695 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2696 jio_fprintf(defaultStream::output_stream(),
2697 "-Xbootclasspath is no longer a supported option.\n");
2698 return JNI_EINVAL;
2699 // -bootclasspath/a:
2700 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2701 Arguments::append_sysclasspath(tail);
2702 // -bootclasspath/p:
2703 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2704 jio_fprintf(defaultStream::output_stream(),
2705 "-Xbootclasspath/p is no longer a supported option.\n");
2706 return JNI_EINVAL;
2707 // -Xrun
2708 } else if (match_option(option, "-Xrun", &tail)) {
2709 if (tail != NULL) {
2710 const char* pos = strchr(tail, ':');
2711 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2712 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2713 jio_snprintf(name, len + 1, "%s", tail);
2714
2715 char *options = NULL;
2716 if(pos != NULL) {
2717 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2718 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2719 }
2720 #if !INCLUDE_JVMTI
2721 if (strcmp(name, "jdwp") == 0) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "Debugging agents are not supported in this VM\n");
2724 return JNI_ERR;
2725 }
2726 #endif // !INCLUDE_JVMTI
2727 add_init_library(name, options);
2728 }
2729 } else if (match_option(option, "--add-reads=", &tail)) {
2730 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2731 return JNI_ENOMEM;
2732 }
2733 } else if (match_option(option, "--add-exports=", &tail)) {
2734 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2735 return JNI_ENOMEM;
2736 }
2737 } else if (match_option(option, "--add-opens=", &tail)) {
2738 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2739 return JNI_ENOMEM;
2740 }
2741 } else if (match_option(option, "--add-modules=", &tail)) {
2742 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2743 return JNI_ENOMEM;
2744 }
2745 } else if (match_option(option, "--limit-modules=", &tail)) {
2746 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2747 return JNI_ENOMEM;
2748 }
2749 } else if (match_option(option, "--module-path=", &tail)) {
2750 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2751 return JNI_ENOMEM;
2752 }
2753 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2754 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2755 return JNI_ENOMEM;
2756 }
2757 } else if (match_option(option, "--patch-module=", &tail)) {
2758 // --patch-module=<module>=<file>(<pathsep><file>)*
2759 int res = process_patch_mod_option(tail, patch_mod_javabase);
2760 if (res != JNI_OK) {
2761 return res;
2762 }
2763 } else if (match_option(option, "--illegal-access=", &tail)) {
2764 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2765 return JNI_ENOMEM;
2766 }
2767 // -agentlib and -agentpath
2768 } else if (match_option(option, "-agentlib:", &tail) ||
2769 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2770 if(tail != NULL) {
2771 const char* pos = strchr(tail, '=');
2772 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2773 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2774 name[len] = '\0';
2775
2776 char *options = NULL;
2777 if(pos != NULL) {
2778 options = os::strdup_check_oom(pos + 1, mtArguments);
2779 }
2780 #if !INCLUDE_JVMTI
2781 if (valid_jdwp_agent(name, is_absolute_path)) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Debugging agents are not supported in this VM\n");
2784 return JNI_ERR;
2785 }
2786 #endif // !INCLUDE_JVMTI
2787 add_init_agent(name, options, is_absolute_path);
2788 }
2789 // -javaagent
2790 } else if (match_option(option, "-javaagent:", &tail)) {
2791 #if !INCLUDE_JVMTI
2792 jio_fprintf(defaultStream::error_stream(),
2793 "Instrumentation agents are not supported in this VM\n");
2794 return JNI_ERR;
2795 #else
2796 if (tail != NULL) {
2797 size_t length = strlen(tail) + 1;
2798 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2799 jio_snprintf(options, length, "%s", tail);
2800 add_instrument_agent("instrument", options, false);
2801 // java agents need module java.instrument
2802 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2803 return JNI_ENOMEM;
2804 }
2805 }
2806 #endif // !INCLUDE_JVMTI
2807 // -Xnoclassgc
2808 } else if (match_option(option, "-Xnoclassgc")) {
2809 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 // -Xconcgc
2813 } else if (match_option(option, "-Xconcgc")) {
2814 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2818 // -Xnoconcgc
2819 } else if (match_option(option, "-Xnoconcgc")) {
2820 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2824 // -Xbatch
2825 } else if (match_option(option, "-Xbatch")) {
2826 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829 // -Xmn for compatibility with other JVM vendors
2830 } else if (match_option(option, "-Xmn", &tail)) {
2831 julong long_initial_young_size = 0;
2832 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2833 if (errcode != arg_in_range) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Invalid initial young generation size: %s\n", option->optionString);
2836 describe_range_error(errcode);
2837 return JNI_EINVAL;
2838 }
2839 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2840 return JNI_EINVAL;
2841 }
2842 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 // -Xms
2846 } else if (match_option(option, "-Xms", &tail)) {
2847 julong long_initial_heap_size = 0;
2848 // an initial heap size of 0 means automatically determine
2849 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid initial heap size: %s\n", option->optionString);
2853 describe_range_error(errcode);
2854 return JNI_EINVAL;
2855 }
2856 set_min_heap_size((size_t)long_initial_heap_size);
2857 // Currently the minimum size and the initial heap sizes are the same.
2858 // Can be overridden with -XX:InitialHeapSize.
2859 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 // -Xmx
2863 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2864 julong long_max_heap_size = 0;
2865 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2866 if (errcode != arg_in_range) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Invalid maximum heap size: %s\n", option->optionString);
2869 describe_range_error(errcode);
2870 return JNI_EINVAL;
2871 }
2872 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 // Xmaxf
2876 } else if (match_option(option, "-Xmaxf", &tail)) {
2877 char* err;
2878 int maxf = (int)(strtod(tail, &err) * 100);
2879 if (*err != '\0' || *tail == '\0') {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Bad max heap free percentage size: %s\n",
2882 option->optionString);
2883 return JNI_EINVAL;
2884 } else {
2885 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 }
2889 // Xminf
2890 } else if (match_option(option, "-Xminf", &tail)) {
2891 char* err;
2892 int minf = (int)(strtod(tail, &err) * 100);
2893 if (*err != '\0' || *tail == '\0') {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Bad min heap free percentage size: %s\n",
2896 option->optionString);
2897 return JNI_EINVAL;
2898 } else {
2899 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 }
2903 // -Xss
2904 } else if (match_option(option, "-Xss", &tail)) {
2905 intx value = 0;
2906 jint err = parse_xss(option, tail, &value);
2907 if (err != JNI_OK) {
2908 return err;
2909 }
2910 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2914 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2915 julong long_ReservedCodeCacheSize = 0;
2916
2917 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2918 if (errcode != arg_in_range) {
2919 jio_fprintf(defaultStream::error_stream(),
2920 "Invalid maximum code cache size: %s.\n", option->optionString);
2921 return JNI_EINVAL;
2922 }
2923 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 // -green
2927 } else if (match_option(option, "-green")) {
2928 jio_fprintf(defaultStream::error_stream(),
2929 "Green threads support not available\n");
2930 return JNI_EINVAL;
2931 // -native
2932 } else if (match_option(option, "-native")) {
2933 // HotSpot always uses native threads, ignore silently for compatibility
2934 // -Xrs
2935 } else if (match_option(option, "-Xrs")) {
2936 // Classic/EVM option, new functionality
2937 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 // -Xprof
2941 } else if (match_option(option, "-Xprof")) {
2942 char version[256];
2943 // Obsolete in JDK 10
2944 JDK_Version::jdk(10).to_string(version, sizeof(version));
2945 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2946 // -Xconcurrentio
2947 } else if (match_option(option, "-Xconcurrentio")) {
2948 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2958 return JNI_EINVAL;
2959 }
2960 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2961 return JNI_EINVAL;
2962 }
2963
2964 // -Xinternalversion
2965 } else if (match_option(option, "-Xinternalversion")) {
2966 jio_fprintf(defaultStream::output_stream(), "%s\n",
2967 VM_Version::internal_vm_info_string());
2968 vm_exit(0);
2969 #ifndef PRODUCT
2970 // -Xprintflags
2971 } else if (match_option(option, "-Xprintflags")) {
2972 CommandLineFlags::printFlags(tty, false);
2973 vm_exit(0);
2974 #endif
2975 // -D
2976 } else if (match_option(option, "-D", &tail)) {
2977 const char* value;
2978 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2979 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2980 // abort if -Djava.endorsed.dirs is set
2981 jio_fprintf(defaultStream::output_stream(),
2982 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2983 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2984 return JNI_EINVAL;
2985 }
2986 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2987 *value != '\0' && strcmp(value, "\"\"") != 0) {
2988 // abort if -Djava.ext.dirs is set
2989 jio_fprintf(defaultStream::output_stream(),
2990 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2991 return JNI_EINVAL;
2992 }
2993 // Check for module related properties. They must be set using the modules
2994 // options. For example: use "--add-modules=java.sql", not
2995 // "-Djdk.module.addmods=java.sql"
2996 if (is_internal_module_property(option->optionString + 2)) {
2997 needs_module_property_warning = true;
2998 continue;
2999 }
3000
3001 if (!add_property(tail)) {
3002 return JNI_ENOMEM;
3003 }
3004 // Out of the box management support
3005 if (match_option(option, "-Dcom.sun.management", &tail)) {
3006 #if INCLUDE_MANAGEMENT
3007 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 // management agent in module jdk.management.agent
3011 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3012 return JNI_ENOMEM;
3013 }
3014 #else
3015 jio_fprintf(defaultStream::output_stream(),
3016 "-Dcom.sun.management is not supported in this VM.\n");
3017 return JNI_ERR;
3018 #endif
3019 }
3020 // -Xint
3021 } else if (match_option(option, "-Xint")) {
3022 set_mode_flags(_int);
3023 // -Xmixed
3024 } else if (match_option(option, "-Xmixed")) {
3025 set_mode_flags(_mixed);
3026 // -Xcomp
3027 } else if (match_option(option, "-Xcomp")) {
3028 // for testing the compiler; turn off all flags that inhibit compilation
3029 set_mode_flags(_comp);
3030 // -Xshare:dump
3031 } else if (match_option(option, "-Xshare:dump")) {
3032 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3033 return JNI_EINVAL;
3034 }
3035 set_mode_flags(_int); // Prevent compilation, which creates objects
3036 // -Xshare:on
3037 } else if (match_option(option, "-Xshare:on")) {
3038 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3042 return JNI_EINVAL;
3043 }
3044 // -Xshare:auto
3045 } else if (match_option(option, "-Xshare:auto")) {
3046 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3050 return JNI_EINVAL;
3051 }
3052 // -Xshare:off
3053 } else if (match_option(option, "-Xshare:off")) {
3054 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 // -Xverify
3061 } else if (match_option(option, "-Xverify", &tail)) {
3062 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3063 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3064 return JNI_EINVAL;
3065 }
3066 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3067 return JNI_EINVAL;
3068 }
3069 } else if (strcmp(tail, ":remote") == 0) {
3070 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3074 return JNI_EINVAL;
3075 }
3076 } else if (strcmp(tail, ":none") == 0) {
3077 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3084 return JNI_EINVAL;
3085 }
3086 // -Xdebug
3087 } else if (match_option(option, "-Xdebug")) {
3088 // note this flag has been used, then ignore
3089 set_xdebug_mode(true);
3090 // -Xnoagent
3091 } else if (match_option(option, "-Xnoagent")) {
3092 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3093 } else if (match_option(option, "-Xloggc:", &tail)) {
3094 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3095 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3096 _gc_log_filename = os::strdup_check_oom(tail);
3097 } else if (match_option(option, "-Xlog", &tail)) {
3098 bool ret = false;
3099 if (strcmp(tail, ":help") == 0) {
3100 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3101 vm_exit(0);
3102 } else if (strcmp(tail, ":disable") == 0) {
3103 LogConfiguration::disable_logging();
3104 ret = true;
3105 } else if (*tail == '\0') {
3106 ret = LogConfiguration::parse_command_line_arguments();
3107 assert(ret, "-Xlog without arguments should never fail to parse");
3108 } else if (*tail == ':') {
3109 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3110 }
3111 if (ret == false) {
3112 jio_fprintf(defaultStream::error_stream(),
3113 "Invalid -Xlog option '-Xlog%s'\n",
3114 tail);
3115 return JNI_EINVAL;
3116 }
3117 // JNI hooks
3118 } else if (match_option(option, "-Xcheck", &tail)) {
3119 if (!strcmp(tail, ":jni")) {
3120 #if !INCLUDE_JNI_CHECK
3121 warning("JNI CHECKING is not supported in this VM");
3122 #else
3123 CheckJNICalls = true;
3124 #endif // INCLUDE_JNI_CHECK
3125 } else if (is_bad_option(option, args->ignoreUnrecognized,
3126 "check")) {
3127 return JNI_EINVAL;
3128 }
3129 } else if (match_option(option, "vfprintf")) {
3130 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3131 } else if (match_option(option, "exit")) {
3132 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3133 } else if (match_option(option, "abort")) {
3134 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3135 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3136 // and the last option wins.
3137 } else if (match_option(option, "-XX:+NeverTenure")) {
3138 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3139 return JNI_EINVAL;
3140 }
3141 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3145 return JNI_EINVAL;
3146 }
3147 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3148 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3152 return JNI_EINVAL;
3153 }
3154 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3158 uintx max_tenuring_thresh = 0;
3159 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3160 jio_fprintf(defaultStream::error_stream(),
3161 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3162 return JNI_EINVAL;
3163 }
3164
3165 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3166 return JNI_EINVAL;
3167 }
3168
3169 if (MaxTenuringThreshold == 0) {
3170 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3171 return JNI_EINVAL;
3172 }
3173 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176 } else {
3177 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 }
3184 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3185 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3192 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3199 #if defined(DTRACE_ENABLED)
3200 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3207 return JNI_EINVAL;
3208 }
3209 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3210 return JNI_EINVAL;
3211 }
3212 #else // defined(DTRACE_ENABLED)
3213 jio_fprintf(defaultStream::error_stream(),
3214 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3215 return JNI_EINVAL;
3216 #endif // defined(DTRACE_ENABLED)
3217 #ifdef ASSERT
3218 } else if (match_option(option, "-XX:+FullGCALot")) {
3219 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3220 return JNI_EINVAL;
3221 }
3222 // disable scavenge before parallel mark-compact
3223 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 #endif
3227 #if !INCLUDE_MANAGEMENT
3228 } else if (match_option(option, "-XX:+ManagementServer")) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "ManagementServer is not supported in this VM.\n");
3231 return JNI_ERR;
3232 #endif // INCLUDE_MANAGEMENT
3233 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3234 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3235 // already been handled
3236 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3237 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3238 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3239 return JNI_EINVAL;
3240 }
3241 }
3242 // Unknown option
3243 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3244 return JNI_ERR;
3245 }
3246 }
3247
3248 // PrintSharedArchiveAndExit will turn on
3249 // -Xshare:on
3250 // -Xlog:class+path=info
3251 if (PrintSharedArchiveAndExit) {
3252 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3253 return JNI_EINVAL;
3254 }
3255 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3256 return JNI_EINVAL;
3257 }
3258 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3259 }
3260
3261 // Change the default value for flags which have different default values
3262 // when working with older JDKs.
3263 #ifdef LINUX
3264 if (JDK_Version::current().compare_major(6) <= 0 &&
3265 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3266 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3267 }
3268 #endif // LINUX
3269 fix_appclasspath();
3270 return JNI_OK;
3271 }
3272
3273 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3274 // For java.base check for duplicate --patch-module options being specified on the command line.
3275 // This check is only required for java.base, all other duplicate module specifications
3276 // will be checked during module system initialization. The module system initialization
3277 // will throw an ExceptionInInitializerError if this situation occurs.
3278 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3279 if (*patch_mod_javabase) {
3280 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3281 } else {
3282 *patch_mod_javabase = true;
3283 }
3284 }
3285
3286 // Create GrowableArray lazily, only if --patch-module has been specified
3287 if (_patch_mod_prefix == NULL) {
3288 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3289 }
3290
3291 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3292 }
3293
3294 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3295 //
3296 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3297 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3298 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3299 // path is treated as the current directory.
3300 //
3301 // This causes problems with CDS, which requires that all directories specified in the classpath
3302 // must be empty. In most cases, applications do NOT want to load classes from the current
3303 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3304 // scripts compatible with CDS.
3305 void Arguments::fix_appclasspath() {
3306 if (IgnoreEmptyClassPaths) {
3307 const char separator = *os::path_separator();
3308 const char* src = _java_class_path->value();
3309
3310 // skip over all the leading empty paths
3311 while (*src == separator) {
3312 src ++;
3313 }
3314
3315 char* copy = os::strdup_check_oom(src, mtArguments);
3316
3317 // trim all trailing empty paths
3318 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3319 *tail = '\0';
3320 }
3321
3322 char from[3] = {separator, separator, '\0'};
3323 char to [2] = {separator, '\0'};
3324 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3325 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3326 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3327 }
3328
3329 _java_class_path->set_writeable_value(copy);
3330 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3331 }
3332 }
3333
3334 static bool has_jar_files(const char* directory) {
3335 DIR* dir = os::opendir(directory);
3336 if (dir == NULL) return false;
3337
3338 struct dirent *entry;
3339 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3340 bool hasJarFile = false;
3341 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3342 const char* name = entry->d_name;
3343 const char* ext = name + strlen(name) - 4;
3344 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3345 }
3346 FREE_C_HEAP_ARRAY(char, dbuf);
3347 os::closedir(dir);
3348 return hasJarFile ;
3349 }
3350
3351 static int check_non_empty_dirs(const char* path) {
3352 const char separator = *os::path_separator();
3353 const char* const end = path + strlen(path);
3354 int nonEmptyDirs = 0;
3355 while (path < end) {
3356 const char* tmp_end = strchr(path, separator);
3357 if (tmp_end == NULL) {
3358 if (has_jar_files(path)) {
3359 nonEmptyDirs++;
3360 jio_fprintf(defaultStream::output_stream(),
3361 "Non-empty directory: %s\n", path);
3362 }
3363 path = end;
3364 } else {
3365 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3366 memcpy(dirpath, path, tmp_end - path);
3367 dirpath[tmp_end - path] = '\0';
3368 if (has_jar_files(dirpath)) {
3369 nonEmptyDirs++;
3370 jio_fprintf(defaultStream::output_stream(),
3371 "Non-empty directory: %s\n", dirpath);
3372 }
3373 FREE_C_HEAP_ARRAY(char, dirpath);
3374 path = tmp_end + 1;
3375 }
3376 }
3377 return nonEmptyDirs;
3378 }
3379
3380 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3381 // check if the default lib/endorsed directory exists; if so, error
3382 char path[JVM_MAXPATHLEN];
3383 const char* fileSep = os::file_separator();
3384 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3385
3386 if (CheckEndorsedAndExtDirs) {
3387 int nonEmptyDirs = 0;
3388 // check endorsed directory
3389 nonEmptyDirs += check_non_empty_dirs(path);
3390 // check the extension directories
3391 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3392 if (nonEmptyDirs > 0) {
3393 return JNI_ERR;
3394 }
3395 }
3396
3397 DIR* dir = os::opendir(path);
3398 if (dir != NULL) {
3399 jio_fprintf(defaultStream::output_stream(),
3400 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3401 "in modular form will be supported via the concept of upgradeable modules.\n");
3402 os::closedir(dir);
3403 return JNI_ERR;
3404 }
3405
3406 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3407 dir = os::opendir(path);
3408 if (dir != NULL) {
3409 jio_fprintf(defaultStream::output_stream(),
3410 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3411 "Use -classpath instead.\n.");
3412 os::closedir(dir);
3413 return JNI_ERR;
3414 }
3415
3416 // This must be done after all arguments have been processed
3417 // and the container support has been initialized since AggressiveHeap
3418 // relies on the amount of total memory available.
3419 if (AggressiveHeap) {
3420 jint result = set_aggressive_heap_flags();
3421 if (result != JNI_OK) {
3422 return result;
3423 }
3424 }
3425
3426 // This must be done after all arguments have been processed.
3427 // java_compiler() true means set to "NONE" or empty.
3428 if (java_compiler() && !xdebug_mode()) {
3429 // For backwards compatibility, we switch to interpreted mode if
3430 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3431 // not specified.
3432 set_mode_flags(_int);
3433 }
3434
3435 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3436 // but like -Xint, leave compilation thresholds unaffected.
3437 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3438 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3439 set_mode_flags(_int);
3440 }
3441
3442 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3443 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3444 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3445 }
3446
3447 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3448 // Don't degrade server performance for footprint
3449 if (FLAG_IS_DEFAULT(UseLargePages) &&
3450 MaxHeapSize < LargePageHeapSizeThreshold) {
3451 // No need for large granularity pages w/small heaps.
3452 // Note that large pages are enabled/disabled for both the
3453 // Java heap and the code cache.
3454 FLAG_SET_DEFAULT(UseLargePages, false);
3455 }
3456
3457 #elif defined(COMPILER2)
3458 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3459 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3460 }
3461 #endif
3462
3463 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3464 UNSUPPORTED_OPTION(ProfileInterpreter);
3465 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3466 #endif
3467
3468 #ifndef TIERED
3469 // Tiered compilation is undefined.
3470 UNSUPPORTED_OPTION(TieredCompilation);
3471 #endif
3472
3473 #if INCLUDE_JVMCI
3474 if (EnableJVMCI &&
3475 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3476 return JNI_ENOMEM;
3477 }
3478 #endif
3479
3480 if (!check_vm_args_consistency()) {
3481 return JNI_ERR;
3482 }
3483
3484 #if INCLUDE_JVMCI
3485 if (UseJVMCICompiler) {
3486 Compilation_mode = CompMode_server;
3487 }
3488 #endif
3489
3490 #if INCLUDE_CDS
3491 if (DumpSharedSpaces) {
3492 // Disable biased locking now as it interferes with the clean up of
3493 // the archived Klasses and Java string objects (at dump time only).
3494 UseBiasedLocking = false;
3495 }
3496 if (UseSharedSpaces && patch_mod_javabase) {
3497 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3498 }
3499 #endif
3500
3501 return JNI_OK;
3502 }
3503
3504 // Helper class for controlling the lifetime of JavaVMInitArgs
3505 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3506 // deleted on the destruction of the ScopedVMInitArgs object.
3507 class ScopedVMInitArgs : public StackObj {
3508 private:
3509 JavaVMInitArgs _args;
3510 char* _container_name;
3511 bool _is_set;
3512 char* _vm_options_file_arg;
3513
3514 public:
3515 ScopedVMInitArgs(const char *container_name) {
3516 _args.version = JNI_VERSION_1_2;
3517 _args.nOptions = 0;
3518 _args.options = NULL;
3519 _args.ignoreUnrecognized = false;
3520 _container_name = (char *)container_name;
3521 _is_set = false;
3522 _vm_options_file_arg = NULL;
3523 }
3524
3525 // Populates the JavaVMInitArgs object represented by this
3526 // ScopedVMInitArgs object with the arguments in options. The
3527 // allocated memory is deleted by the destructor. If this method
3528 // returns anything other than JNI_OK, then this object is in a
3529 // partially constructed state, and should be abandoned.
3530 jint set_args(GrowableArray<JavaVMOption>* options) {
3531 _is_set = true;
3532 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3533 JavaVMOption, options->length(), mtArguments);
3534 if (options_arr == NULL) {
3535 return JNI_ENOMEM;
3536 }
3537 _args.options = options_arr;
3538
3539 for (int i = 0; i < options->length(); i++) {
3540 options_arr[i] = options->at(i);
3541 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3542 if (options_arr[i].optionString == NULL) {
3543 // Rely on the destructor to do cleanup.
3544 _args.nOptions = i;
3545 return JNI_ENOMEM;
3546 }
3547 }
3548
3549 _args.nOptions = options->length();
3550 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3551 return JNI_OK;
3552 }
3553
3554 JavaVMInitArgs* get() { return &_args; }
3555 char* container_name() { return _container_name; }
3556 bool is_set() { return _is_set; }
3557 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3558 char* vm_options_file_arg() { return _vm_options_file_arg; }
3559
3560 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3561 if (_vm_options_file_arg != NULL) {
3562 os::free(_vm_options_file_arg);
3563 }
3564 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3565 }
3566
3567 ~ScopedVMInitArgs() {
3568 if (_vm_options_file_arg != NULL) {
3569 os::free(_vm_options_file_arg);
3570 }
3571 if (_args.options == NULL) return;
3572 for (int i = 0; i < _args.nOptions; i++) {
3573 os::free(_args.options[i].optionString);
3574 }
3575 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3576 }
3577
3578 // Insert options into this option list, to replace option at
3579 // vm_options_file_pos (-XX:VMOptionsFile)
3580 jint insert(const JavaVMInitArgs* args,
3581 const JavaVMInitArgs* args_to_insert,
3582 const int vm_options_file_pos) {
3583 assert(_args.options == NULL, "shouldn't be set yet");
3584 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3585 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3586
3587 int length = args->nOptions + args_to_insert->nOptions - 1;
3588 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3589 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3590 for (int i = 0; i < args->nOptions; i++) {
3591 if (i == vm_options_file_pos) {
3592 // insert the new options starting at the same place as the
3593 // -XX:VMOptionsFile option
3594 for (int j = 0; j < args_to_insert->nOptions; j++) {
3595 options->push(args_to_insert->options[j]);
3596 }
3597 } else {
3598 options->push(args->options[i]);
3599 }
3600 }
3601 // make into options array
3602 jint result = set_args(options);
3603 delete options;
3604 return result;
3605 }
3606 };
3607
3608 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3609 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3610 }
3611
3612 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3613 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3614 }
3615
3616 jint Arguments::parse_options_environment_variable(const char* name,
3617 ScopedVMInitArgs* vm_args) {
3618 char *buffer = ::getenv(name);
3619
3620 // Don't check this environment variable if user has special privileges
3621 // (e.g. unix su command).
3622 if (buffer == NULL || os::have_special_privileges()) {
3623 return JNI_OK;
3624 }
3625
3626 if ((buffer = os::strdup(buffer)) == NULL) {
3627 return JNI_ENOMEM;
3628 }
3629
3630 jio_fprintf(defaultStream::error_stream(),
3631 "Picked up %s: %s\n", name, buffer);
3632
3633 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3634
3635 os::free(buffer);
3636 return retcode;
3637 }
3638
3639 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3640 // read file into buffer
3641 int fd = ::open(file_name, O_RDONLY);
3642 if (fd < 0) {
3643 jio_fprintf(defaultStream::error_stream(),
3644 "Could not open options file '%s'\n",
3645 file_name);
3646 return JNI_ERR;
3647 }
3648
3649 struct stat stbuf;
3650 int retcode = os::stat(file_name, &stbuf);
3651 if (retcode != 0) {
3652 jio_fprintf(defaultStream::error_stream(),
3653 "Could not stat options file '%s'\n",
3654 file_name);
3655 os::close(fd);
3656 return JNI_ERR;
3657 }
3658
3659 if (stbuf.st_size == 0) {
3660 // tell caller there is no option data and that is ok
3661 os::close(fd);
3662 return JNI_OK;
3663 }
3664
3665 // '+ 1' for NULL termination even with max bytes
3666 size_t bytes_alloc = stbuf.st_size + 1;
3667
3668 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3669 if (NULL == buf) {
3670 jio_fprintf(defaultStream::error_stream(),
3671 "Could not allocate read buffer for options file parse\n");
3672 os::close(fd);
3673 return JNI_ENOMEM;
3674 }
3675
3676 memset(buf, 0, bytes_alloc);
3677
3678 // Fill buffer
3679 // Use ::read() instead of os::read because os::read()
3680 // might do a thread state transition
3681 // and it is too early for that here
3682
3683 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3684 os::close(fd);
3685 if (bytes_read < 0) {
3686 FREE_C_HEAP_ARRAY(char, buf);
3687 jio_fprintf(defaultStream::error_stream(),
3688 "Could not read options file '%s'\n", file_name);
3689 return JNI_ERR;
3690 }
3691
3692 if (bytes_read == 0) {
3693 // tell caller there is no option data and that is ok
3694 FREE_C_HEAP_ARRAY(char, buf);
3695 return JNI_OK;
3696 }
3697
3698 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3699
3700 FREE_C_HEAP_ARRAY(char, buf);
3701 return retcode;
3702 }
3703
3704 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3705 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3706
3707 // some pointers to help with parsing
3708 char *buffer_end = buffer + buf_len;
3709 char *opt_hd = buffer;
3710 char *wrt = buffer;
3711 char *rd = buffer;
3712
3713 // parse all options
3714 while (rd < buffer_end) {
3715 // skip leading white space from the input string
3716 while (rd < buffer_end && isspace(*rd)) {
3717 rd++;
3718 }
3719
3720 if (rd >= buffer_end) {
3721 break;
3722 }
3723
3724 // Remember this is where we found the head of the token.
3725 opt_hd = wrt;
3726
3727 // Tokens are strings of non white space characters separated
3728 // by one or more white spaces.
3729 while (rd < buffer_end && !isspace(*rd)) {
3730 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3731 int quote = *rd; // matching quote to look for
3732 rd++; // don't copy open quote
3733 while (rd < buffer_end && *rd != quote) {
3734 // include everything (even spaces)
3735 // up until the close quote
3736 *wrt++ = *rd++; // copy to option string
3737 }
3738
3739 if (rd < buffer_end) {
3740 rd++; // don't copy close quote
3741 } else {
3742 // did not see closing quote
3743 jio_fprintf(defaultStream::error_stream(),
3744 "Unmatched quote in %s\n", name);
3745 delete options;
3746 return JNI_ERR;
3747 }
3748 } else {
3749 *wrt++ = *rd++; // copy to option string
3750 }
3751 }
3752
3753 // steal a white space character and set it to NULL
3754 *wrt++ = '\0';
3755 // We now have a complete token
3756
3757 JavaVMOption option;
3758 option.optionString = opt_hd;
3759 option.extraInfo = NULL;
3760
3761 options->append(option); // Fill in option
3762
3763 rd++; // Advance to next character
3764 }
3765
3766 // Fill out JavaVMInitArgs structure.
3767 jint status = vm_args->set_args(options);
3768
3769 delete options;
3770 return status;
3771 }
3772
3773 void Arguments::set_shared_spaces_flags() {
3774 if (DumpSharedSpaces) {
3775 if (FailOverToOldVerifier) {
3776 // Don't fall back to the old verifier on verification failure. If a
3777 // class fails verification with the split verifier, it might fail the
3778 // CDS runtime verifier constraint check. In that case, we don't want
3779 // to share the class. We only archive classes that pass the split verifier.
3780 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3781 }
3782
3783 if (RequireSharedSpaces) {
3784 warning("Cannot dump shared archive while using shared archive");
3785 }
3786 UseSharedSpaces = false;
3787 #ifdef _LP64
3788 if (!UseCompressedOops || !UseCompressedClassPointers) {
3789 vm_exit_during_initialization(
3790 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3791 }
3792 } else {
3793 if (!UseCompressedOops || !UseCompressedClassPointers) {
3794 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3795 }
3796 #endif
3797 }
3798 }
3799
3800 // Sharing support
3801 // Construct the path to the archive
3802 static char* get_shared_archive_path() {
3803 char *shared_archive_path;
3804 if (SharedArchiveFile == NULL) {
3805 char jvm_path[JVM_MAXPATHLEN];
3806 os::jvm_path(jvm_path, sizeof(jvm_path));
3807 char *end = strrchr(jvm_path, *os::file_separator());
3808 if (end != NULL) *end = '\0';
3809 size_t jvm_path_len = strlen(jvm_path);
3810 size_t file_sep_len = strlen(os::file_separator());
3811 const size_t len = jvm_path_len + file_sep_len + 20;
3812 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3813 if (shared_archive_path != NULL) {
3814 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3815 jvm_path, os::file_separator());
3816 }
3817 } else {
3818 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3819 }
3820 return shared_archive_path;
3821 }
3822
3823 #ifndef PRODUCT
3824 // Determine whether LogVMOutput should be implicitly turned on.
3825 static bool use_vm_log() {
3826 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3827 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3828 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3829 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3830 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3831 return true;
3832 }
3833
3834 #ifdef COMPILER1
3835 if (PrintC1Statistics) {
3836 return true;
3837 }
3838 #endif // COMPILER1
3839
3840 #ifdef COMPILER2
3841 if (PrintOptoAssembly || PrintOptoStatistics) {
3842 return true;
3843 }
3844 #endif // COMPILER2
3845
3846 return false;
3847 }
3848
3849 #endif // PRODUCT
3850
3851 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3852 for (int index = 0; index < args->nOptions; index++) {
3853 const JavaVMOption* option = args->options + index;
3854 const char* tail;
3855 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3856 return true;
3857 }
3858 }
3859 return false;
3860 }
3861
3862 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3863 const char* vm_options_file,
3864 const int vm_options_file_pos,
3865 ScopedVMInitArgs* vm_options_file_args,
3866 ScopedVMInitArgs* args_out) {
3867 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3868 if (code != JNI_OK) {
3869 return code;
3870 }
3871
3872 if (vm_options_file_args->get()->nOptions < 1) {
3873 return JNI_OK;
3874 }
3875
3876 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3877 jio_fprintf(defaultStream::error_stream(),
3878 "A VM options file may not refer to a VM options file. "
3879 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3880 "options file '%s' in options container '%s' is an error.\n",
3881 vm_options_file_args->vm_options_file_arg(),
3882 vm_options_file_args->container_name());
3883 return JNI_EINVAL;
3884 }
3885
3886 return args_out->insert(args, vm_options_file_args->get(),
3887 vm_options_file_pos);
3888 }
3889
3890 // Expand -XX:VMOptionsFile found in args_in as needed.
3891 // mod_args and args_out parameters may return values as needed.
3892 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3893 ScopedVMInitArgs* mod_args,
3894 JavaVMInitArgs** args_out) {
3895 jint code = match_special_option_and_act(args_in, mod_args);
3896 if (code != JNI_OK) {
3897 return code;
3898 }
3899
3900 if (mod_args->is_set()) {
3901 // args_in contains -XX:VMOptionsFile and mod_args contains the
3902 // original options from args_in along with the options expanded
3903 // from the VMOptionsFile. Return a short-hand to the caller.
3904 *args_out = mod_args->get();
3905 } else {
3906 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3907 }
3908 return JNI_OK;
3909 }
3910
3911 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3912 ScopedVMInitArgs* args_out) {
3913 // Remaining part of option string
3914 const char* tail;
3915 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3916
3917 for (int index = 0; index < args->nOptions; index++) {
3918 const JavaVMOption* option = args->options + index;
3919 if (ArgumentsExt::process_options(option)) {
3920 continue;
3921 }
3922 if (match_option(option, "-XX:Flags=", &tail)) {
3923 Arguments::set_jvm_flags_file(tail);
3924 continue;
3925 }
3926 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3927 if (vm_options_file_args.found_vm_options_file_arg()) {
3928 jio_fprintf(defaultStream::error_stream(),
3929 "The option '%s' is already specified in the options "
3930 "container '%s' so the specification of '%s' in the "
3931 "same options container is an error.\n",
3932 vm_options_file_args.vm_options_file_arg(),
3933 vm_options_file_args.container_name(),
3934 option->optionString);
3935 return JNI_EINVAL;
3936 }
3937 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3938 // If there's a VMOptionsFile, parse that
3939 jint code = insert_vm_options_file(args, tail, index,
3940 &vm_options_file_args, args_out);
3941 if (code != JNI_OK) {
3942 return code;
3943 }
3944 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3945 if (args_out->is_set()) {
3946 // The VMOptions file inserted some options so switch 'args'
3947 // to the new set of options, and continue processing which
3948 // preserves "last option wins" semantics.
3949 args = args_out->get();
3950 // The first option from the VMOptionsFile replaces the
3951 // current option. So we back track to process the
3952 // replacement option.
3953 index--;
3954 }
3955 continue;
3956 }
3957 if (match_option(option, "-XX:+PrintVMOptions")) {
3958 PrintVMOptions = true;
3959 continue;
3960 }
3961 if (match_option(option, "-XX:-PrintVMOptions")) {
3962 PrintVMOptions = false;
3963 continue;
3964 }
3965 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3966 IgnoreUnrecognizedVMOptions = true;
3967 continue;
3968 }
3969 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3970 IgnoreUnrecognizedVMOptions = false;
3971 continue;
3972 }
3973 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3974 CommandLineFlags::printFlags(tty, false);
3975 vm_exit(0);
3976 }
3977 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3978 #if INCLUDE_NMT
3979 // The launcher did not setup nmt environment variable properly.
3980 if (!MemTracker::check_launcher_nmt_support(tail)) {
3981 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3982 }
3983
3984 // Verify if nmt option is valid.
3985 if (MemTracker::verify_nmt_option()) {
3986 // Late initialization, still in single-threaded mode.
3987 if (MemTracker::tracking_level() >= NMT_summary) {
3988 MemTracker::init();
3989 }
3990 } else {
3991 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3992 }
3993 continue;
3994 #else
3995 jio_fprintf(defaultStream::error_stream(),
3996 "Native Memory Tracking is not supported in this VM\n");
3997 return JNI_ERR;
3998 #endif
3999 }
4000
4001 #ifndef PRODUCT
4002 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4003 CommandLineFlags::printFlags(tty, true);
4004 vm_exit(0);
4005 }
4006 #endif
4007
4008 if (match_option(option, "-XX:+UseAppCDS")) {
4009 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4010 if (flag->is_diagnostic()) {
4011 flag->clear_diagnostic();
4012 }
4013 continue;
4014 }
4015 }
4016 return JNI_OK;
4017 }
4018
4019 static void print_options(const JavaVMInitArgs *args) {
4020 const char* tail;
4021 for (int index = 0; index < args->nOptions; index++) {
4022 const JavaVMOption *option = args->options + index;
4023 if (match_option(option, "-XX:", &tail)) {
4024 logOption(tail);
4025 }
4026 }
4027 }
4028
4029 bool Arguments::handle_deprecated_print_gc_flags() {
4030 if (PrintGC) {
4031 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4032 }
4033 if (PrintGCDetails) {
4034 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4035 }
4036
4037 if (_gc_log_filename != NULL) {
4038 // -Xloggc was used to specify a filename
4039 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4040
4041 LogTarget(Error, logging) target;
4042 LogStream errstream(target);
4043 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4044 } else if (PrintGC || PrintGCDetails) {
4045 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4046 }
4047 return true;
4048 }
4049
4050 void Arguments::handle_extra_cms_flags(const char* msg) {
4051 SpecialFlag flag;
4052 const char *flag_name = "UseConcMarkSweepGC";
4053 if (lookup_special_flag(flag_name, flag)) {
4054 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4055 warning("%s", msg);
4056 }
4057 }
4058
4059 // Parse entry point called from JNI_CreateJavaVM
4060
4061 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4062 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4063
4064 // Initialize ranges, constraints and writeables
4065 CommandLineFlagRangeList::init();
4066 CommandLineFlagConstraintList::init();
4067 CommandLineFlagWriteableList::init();
4068
4069 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4070 const char* hotspotrc = ".hotspotrc";
4071 bool settings_file_specified = false;
4072 bool needs_hotspotrc_warning = false;
4073 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4074 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4075
4076 // Pointers to current working set of containers
4077 JavaVMInitArgs* cur_cmd_args;
4078 JavaVMInitArgs* cur_java_options_args;
4079 JavaVMInitArgs* cur_java_tool_options_args;
4080
4081 // Containers for modified/expanded options
4082 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4083 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4084 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4085
4086
4087 jint code =
4088 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4089 if (code != JNI_OK) {
4090 return code;
4091 }
4092
4093 code = parse_java_options_environment_variable(&initial_java_options_args);
4094 if (code != JNI_OK) {
4095 return code;
4096 }
4097
4098 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4099 &mod_java_tool_options_args,
4100 &cur_java_tool_options_args);
4101 if (code != JNI_OK) {
4102 return code;
4103 }
4104
4105 code = expand_vm_options_as_needed(initial_cmd_args,
4106 &mod_cmd_args,
4107 &cur_cmd_args);
4108 if (code != JNI_OK) {
4109 return code;
4110 }
4111
4112 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4113 &mod_java_options_args,
4114 &cur_java_options_args);
4115 if (code != JNI_OK) {
4116 return code;
4117 }
4118
4119 const char* flags_file = Arguments::get_jvm_flags_file();
4120 settings_file_specified = (flags_file != NULL);
4121
4122 if (IgnoreUnrecognizedVMOptions) {
4123 cur_cmd_args->ignoreUnrecognized = true;
4124 cur_java_tool_options_args->ignoreUnrecognized = true;
4125 cur_java_options_args->ignoreUnrecognized = true;
4126 }
4127
4128 // Parse specified settings file
4129 if (settings_file_specified) {
4130 if (!process_settings_file(flags_file, true,
4131 cur_cmd_args->ignoreUnrecognized)) {
4132 return JNI_EINVAL;
4133 }
4134 } else {
4135 #ifdef ASSERT
4136 // Parse default .hotspotrc settings file
4137 if (!process_settings_file(".hotspotrc", false,
4138 cur_cmd_args->ignoreUnrecognized)) {
4139 return JNI_EINVAL;
4140 }
4141 #else
4142 struct stat buf;
4143 if (os::stat(hotspotrc, &buf) == 0) {
4144 needs_hotspotrc_warning = true;
4145 }
4146 #endif
4147 }
4148
4149 if (PrintVMOptions) {
4150 print_options(cur_java_tool_options_args);
4151 print_options(cur_cmd_args);
4152 print_options(cur_java_options_args);
4153 }
4154
4155 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4156 jint result = parse_vm_init_args(cur_java_tool_options_args,
4157 cur_java_options_args,
4158 cur_cmd_args);
4159
4160 if (result != JNI_OK) {
4161 return result;
4162 }
4163
4164 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4165 SharedArchivePath = get_shared_archive_path();
4166 if (SharedArchivePath == NULL) {
4167 return JNI_ENOMEM;
4168 }
4169
4170 // Set up VerifySharedSpaces
4171 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4172 VerifySharedSpaces = true;
4173 }
4174
4175 // Delay warning until here so that we've had a chance to process
4176 // the -XX:-PrintWarnings flag
4177 if (needs_hotspotrc_warning) {
4178 warning("%s file is present but has been ignored. "
4179 "Run with -XX:Flags=%s to load the file.",
4180 hotspotrc, hotspotrc);
4181 }
4182
4183 if (needs_module_property_warning) {
4184 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4185 " names that are reserved for internal use.");
4186 }
4187
4188 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4189 UNSUPPORTED_OPTION(UseLargePages);
4190 #endif
4191
4192 ArgumentsExt::report_unsupported_options();
4193
4194 #ifndef PRODUCT
4195 if (TraceBytecodesAt != 0) {
4196 TraceBytecodes = true;
4197 }
4198 if (CountCompiledCalls) {
4199 if (UseCounterDecay) {
4200 warning("UseCounterDecay disabled because CountCalls is set");
4201 UseCounterDecay = false;
4202 }
4203 }
4204 #endif // PRODUCT
4205
4206 if (ScavengeRootsInCode == 0) {
4207 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4208 warning("Forcing ScavengeRootsInCode non-zero");
4209 }
4210 ScavengeRootsInCode = 1;
4211 }
4212
4213 if (!handle_deprecated_print_gc_flags()) {
4214 return JNI_EINVAL;
4215 }
4216
4217 // Set object alignment values.
4218 set_object_alignment();
4219
4220 #if !INCLUDE_CDS
4221 if (DumpSharedSpaces || RequireSharedSpaces) {
4222 jio_fprintf(defaultStream::error_stream(),
4223 "Shared spaces are not supported in this VM\n");
4224 return JNI_ERR;
4225 }
4226 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4227 log_is_enabled(Info, cds)) {
4228 warning("Shared spaces are not supported in this VM");
4229 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4230 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4231 }
4232 no_shared_spaces("CDS Disabled");
4233 #endif // INCLUDE_CDS
4234
4235 return JNI_OK;
4236 }
4237
4238 jint Arguments::apply_ergo() {
4239 // Set flags based on ergonomics.
4240 jint result = set_ergonomics_flags();
4241 if (result != JNI_OK) return result;
4242
4243 #if INCLUDE_JVMCI
4244 set_jvmci_specific_flags();
4245 #endif
4246
4247 set_shared_spaces_flags();
4248
4249 // Check the GC selections again.
4250 if (!check_gc_consistency()) {
4251 return JNI_EINVAL;
4252 }
4253
4254 if (TieredCompilation) {
4255 set_tiered_flags();
4256 } else {
4257 int max_compilation_policy_choice = 1;
4258 #ifdef COMPILER2
4259 if (is_server_compilation_mode_vm()) {
4260 max_compilation_policy_choice = 2;
4261 }
4262 #endif
4263 // Check if the policy is valid.
4264 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4265 vm_exit_during_initialization(
4266 "Incompatible compilation policy selected", NULL);
4267 }
4268 // Scale CompileThreshold
4269 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4270 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4271 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4272 }
4273 }
4274
4275 #ifdef COMPILER2
4276 #ifndef PRODUCT
4277 if (PrintIdealGraphLevel > 0) {
4278 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4279 }
4280 #endif
4281 #endif
4282
4283 // Set heap size based on available physical memory
4284 set_heap_size();
4285
4286 ArgumentsExt::set_gc_specific_flags();
4287
4288 // Initialize Metaspace flags and alignments
4289 Metaspace::ergo_initialize();
4290
4291 // Set bytecode rewriting flags
4292 set_bytecode_flags();
4293
4294 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4295 jint code = set_aggressive_opts_flags();
4296 if (code != JNI_OK) {
4297 return code;
4298 }
4299
4300 // Turn off biased locking for locking debug mode flags,
4301 // which are subtly different from each other but neither works with
4302 // biased locking
4303 if (UseHeavyMonitors
4304 #ifdef COMPILER1
4305 || !UseFastLocking
4306 #endif // COMPILER1
4307 #if INCLUDE_JVMCI
4308 || !JVMCIUseFastLocking
4309 #endif
4310 ) {
4311 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4312 // flag set to true on command line; warn the user that they
4313 // can't enable biased locking here
4314 warning("Biased Locking is not supported with locking debug flags"
4315 "; ignoring UseBiasedLocking flag." );
4316 }
4317 UseBiasedLocking = false;
4318 }
4319
4320 #ifdef CC_INTERP
4321 // Clear flags not supported on zero.
4322 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4323 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4324 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4325 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4326 #endif // CC_INTERP
4327
4328 #ifdef COMPILER2
4329 if (!EliminateLocks) {
4330 EliminateNestedLocks = false;
4331 }
4332 if (!Inline) {
4333 IncrementalInline = false;
4334 }
4335 #ifndef PRODUCT
4336 if (!IncrementalInline) {
4337 AlwaysIncrementalInline = false;
4338 }
4339 #endif
4340 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4341 // nothing to use the profiling, turn if off
4342 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4343 }
4344 #endif
4345
4346 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4347 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4348 DebugNonSafepoints = true;
4349 }
4350
4351 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4352 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4353 }
4354
4355 if (UseOnStackReplacement && !UseLoopCounter) {
4356 warning("On-stack-replacement requires loop counters; enabling loop counters");
4357 FLAG_SET_DEFAULT(UseLoopCounter, true);
4358 }
4359
4360 #ifndef PRODUCT
4361 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4362 if (use_vm_log()) {
4363 LogVMOutput = true;
4364 }
4365 }
4366 #endif // PRODUCT
4367
4368 if (PrintCommandLineFlags) {
4369 CommandLineFlags::printSetFlags(tty);
4370 }
4371
4372 // Apply CPU specific policy for the BiasedLocking
4373 if (UseBiasedLocking) {
4374 if (!VM_Version::use_biased_locking() &&
4375 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4376 UseBiasedLocking = false;
4377 }
4378 }
4379 #ifdef COMPILER2
4380 if (!UseBiasedLocking || EmitSync != 0) {
4381 UseOptoBiasInlining = false;
4382 }
4383 #endif
4384
4385 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4386 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4387 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4388 } else {
4389 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4390 }
4391
4392 return JNI_OK;
4393 }
4394
4395 jint Arguments::adjust_after_os() {
4396 if (UseNUMA) {
4397 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4398 FLAG_SET_ERGO(bool, UseNUMA, false);
4399 } else if (UseParallelGC || UseParallelOldGC) {
4400 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4401 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4402 }
4403 }
4404 // UseNUMAInterleaving is set to ON for all collectors and
4405 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4406 // such as the parallel collector for Linux and Solaris will
4407 // interleave old gen and survivor spaces on top of NUMA
4408 // allocation policy for the eden space.
4409 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4410 // all platforms and ParallelGC on Windows will interleave all
4411 // of the heap spaces across NUMA nodes.
4412 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4413 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4414 }
4415 }
4416 return JNI_OK;
4417 }
4418
4419 int Arguments::PropertyList_count(SystemProperty* pl) {
4420 int count = 0;
4421 while(pl != NULL) {
4422 count++;
4423 pl = pl->next();
4424 }
4425 return count;
4426 }
4427
4428 // Return the number of readable properties.
4429 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4430 int count = 0;
4431 while(pl != NULL) {
4432 if (pl->is_readable()) {
4433 count++;
4434 }
4435 pl = pl->next();
4436 }
4437 return count;
4438 }
4439
4440 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4441 assert(key != NULL, "just checking");
4442 SystemProperty* prop;
4443 for (prop = pl; prop != NULL; prop = prop->next()) {
4444 if (strcmp(key, prop->key()) == 0) return prop->value();
4445 }
4446 return NULL;
4447 }
4448
4449 // Return the value of the requested property provided that it is a readable property.
4450 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4451 assert(key != NULL, "just checking");
4452 SystemProperty* prop;
4453 // Return the property value if the keys match and the property is not internal or
4454 // it's the special internal property "jdk.boot.class.path.append".
4455 for (prop = pl; prop != NULL; prop = prop->next()) {
4456 if (strcmp(key, prop->key()) == 0) {
4457 if (!prop->internal()) {
4458 return prop->value();
4459 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4460 return prop->value();
4461 } else {
4462 // Property is internal and not jdk.boot.class.path.append so return NULL.
4463 return NULL;
4464 }
4465 }
4466 }
4467 return NULL;
4468 }
4469
4470 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4471 int count = 0;
4472 const char* ret_val = NULL;
4473
4474 while(pl != NULL) {
4475 if(count >= index) {
4476 ret_val = pl->key();
4477 break;
4478 }
4479 count++;
4480 pl = pl->next();
4481 }
4482
4483 return ret_val;
4484 }
4485
4486 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4487 int count = 0;
4488 char* ret_val = NULL;
4489
4490 while(pl != NULL) {
4491 if(count >= index) {
4492 ret_val = pl->value();
4493 break;
4494 }
4495 count++;
4496 pl = pl->next();
4497 }
4498
4499 return ret_val;
4500 }
4501
4502 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4503 SystemProperty* p = *plist;
4504 if (p == NULL) {
4505 *plist = new_p;
4506 } else {
4507 while (p->next() != NULL) {
4508 p = p->next();
4509 }
4510 p->set_next(new_p);
4511 }
4512 }
4513
4514 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4515 bool writeable, bool internal) {
4516 if (plist == NULL)
4517 return;
4518
4519 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4520 PropertyList_add(plist, new_p);
4521 }
4522
4523 void Arguments::PropertyList_add(SystemProperty *element) {
4524 PropertyList_add(&_system_properties, element);
4525 }
4526
4527 // This add maintains unique property key in the list.
4528 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4529 PropertyAppendable append, PropertyWriteable writeable,
4530 PropertyInternal internal) {
4531 if (plist == NULL)
4532 return;
4533
4534 // If property key exist then update with new value.
4535 SystemProperty* prop;
4536 for (prop = *plist; prop != NULL; prop = prop->next()) {
4537 if (strcmp(k, prop->key()) == 0) {
4538 if (append == AppendProperty) {
4539 prop->append_value(v);
4540 } else {
4541 prop->set_value(v);
4542 }
4543 return;
4544 }
4545 }
4546
4547 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4548 }
4549
4550 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4551 // Returns true if all of the source pointed by src has been copied over to
4552 // the destination buffer pointed by buf. Otherwise, returns false.
4553 // Notes:
4554 // 1. If the length (buflen) of the destination buffer excluding the
4555 // NULL terminator character is not long enough for holding the expanded
4556 // pid characters, it also returns false instead of returning the partially
4557 // expanded one.
4558 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4559 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4560 char* buf, size_t buflen) {
4561 const char* p = src;
4562 char* b = buf;
4563 const char* src_end = &src[srclen];
4564 char* buf_end = &buf[buflen - 1];
4565
4566 while (p < src_end && b < buf_end) {
4567 if (*p == '%') {
4568 switch (*(++p)) {
4569 case '%': // "%%" ==> "%"
4570 *b++ = *p++;
4571 break;
4572 case 'p': { // "%p" ==> current process id
4573 // buf_end points to the character before the last character so
4574 // that we could write '\0' to the end of the buffer.
4575 size_t buf_sz = buf_end - b + 1;
4576 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4577
4578 // if jio_snprintf fails or the buffer is not long enough to hold
4579 // the expanded pid, returns false.
4580 if (ret < 0 || ret >= (int)buf_sz) {
4581 return false;
4582 } else {
4583 b += ret;
4584 assert(*b == '\0', "fail in copy_expand_pid");
4585 if (p == src_end && b == buf_end + 1) {
4586 // reach the end of the buffer.
4587 return true;
4588 }
4589 }
4590 p++;
4591 break;
4592 }
4593 default :
4594 *b++ = '%';
4595 }
4596 } else {
4597 *b++ = *p++;
4598 }
4599 }
4600 *b = '\0';
4601 return (p == src_end); // return false if not all of the source was copied
4602 }