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 #if INCLUDE_JVMCI
122 bool Arguments::_force_init_jvmci_runtime = false;
123 #endif
124
125 bool PathString::set_value(const char *value) {
126 if (_value != NULL) {
127 FreeHeap(_value);
128 }
129 _value = AllocateHeap(strlen(value)+1, mtArguments);
130 assert(_value != NULL, "Unable to allocate space for new path value");
131 if (_value != NULL) {
132 strcpy(_value, value);
133 } else {
134 // not able to allocate
135 return false;
136 }
137 return true;
138 }
139
140 void PathString::append_value(const char *value) {
141 char *sp;
142 size_t len = 0;
143 if (value != NULL) {
144 len = strlen(value);
145 if (_value != NULL) {
146 len += strlen(_value);
147 }
148 sp = AllocateHeap(len+2, mtArguments);
149 assert(sp != NULL, "Unable to allocate space for new append path value");
150 if (sp != NULL) {
151 if (_value != NULL) {
152 strcpy(sp, _value);
153 strcat(sp, os::path_separator());
154 strcat(sp, value);
155 FreeHeap(_value);
156 } else {
157 strcpy(sp, value);
158 }
159 _value = sp;
160 }
161 }
162 }
163
164 PathString::PathString(const char* value) {
165 if (value == NULL) {
166 _value = NULL;
167 } else {
168 _value = AllocateHeap(strlen(value)+1, mtArguments);
169 strcpy(_value, value);
170 }
171 }
172
173 PathString::~PathString() {
174 if (_value != NULL) {
175 FreeHeap(_value);
176 _value = NULL;
177 }
178 }
179
180 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
181 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
182 size_t len = strlen(module_name) + 1;
183 _module_name = AllocateHeap(len, mtInternal);
184 strncpy(_module_name, module_name, len); // copy the trailing null
185 _path = new PathString(path);
186 }
187
188 ModulePatchPath::~ModulePatchPath() {
189 if (_module_name != NULL) {
190 FreeHeap(_module_name);
191 _module_name = NULL;
192 }
193 if (_path != NULL) {
194 delete _path;
195 _path = NULL;
196 }
197 }
198
199 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
200 if (key == NULL) {
201 _key = NULL;
202 } else {
203 _key = AllocateHeap(strlen(key)+1, mtArguments);
204 strcpy(_key, key);
205 }
206 _next = NULL;
207 _internal = internal;
208 _writeable = writeable;
209 }
210
211 AgentLibrary::AgentLibrary(const char* name, const char* options,
212 bool is_absolute_path, void* os_lib,
213 bool instrument_lib) {
214 _name = AllocateHeap(strlen(name)+1, mtArguments);
215 strcpy(_name, name);
216 if (options == NULL) {
217 _options = NULL;
218 } else {
219 _options = AllocateHeap(strlen(options)+1, mtArguments);
220 strcpy(_options, options);
221 }
222 _is_absolute_path = is_absolute_path;
223 _os_lib = os_lib;
224 _next = NULL;
225 _state = agent_invalid;
226 _is_static_lib = false;
227 _is_instrument_lib = instrument_lib;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = NULL;
246 bool result = match_option(option, name, &tail);
247 if (tail != NULL && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != NULL; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 static void logOption(const char* opt) {
270 if (PrintVMOptions) {
271 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
272 }
273 }
274
275 bool needs_module_property_warning = false;
276
277 #define MODULE_PROPERTY_PREFIX "jdk.module."
278 #define MODULE_PROPERTY_PREFIX_LEN 11
279 #define ADDEXPORTS "addexports"
280 #define ADDEXPORTS_LEN 10
281 #define ADDREADS "addreads"
282 #define ADDREADS_LEN 8
283 #define ADDOPENS "addopens"
284 #define ADDOPENS_LEN 8
285 #define PATCH "patch"
286 #define PATCH_LEN 5
287 #define ADDMODS "addmods"
288 #define ADDMODS_LEN 7
289 #define LIMITMODS "limitmods"
290 #define LIMITMODS_LEN 9
291 #define PATH "path"
292 #define PATH_LEN 4
293 #define UPGRADE_PATH "upgrade.path"
294 #define UPGRADE_PATH_LEN 12
295
296 void Arguments::add_init_library(const char* name, char* options) {
297 _libraryList.add(new AgentLibrary(name, options, false, NULL));
298 }
299
300 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
301 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
302 }
303
304 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
305 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
306 }
307
308 // Late-binding agents not started via arguments
309 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
310 _agentList.add(agentLib);
311 }
312
313 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
314 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
315 }
316
317 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
318 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
319 return ((strncmp(option, property, len) == 0) &&
320 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
321 }
322
323 // Return true if property starts with "jdk.module." and its ensuing chars match
324 // any of the reserved module properties.
325 // property should be passed without the leading "-D".
326 bool Arguments::is_internal_module_property(const char* property) {
327 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
328 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
329 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
330 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
331 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
332 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
333 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
334 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
335 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
336 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
337 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
338 return true;
339 }
340 }
341 return false;
342 }
343
344 // Process java launcher properties.
345 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
346 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
347 // sun.java.launcher.pid is defined.
348 // Must do this before setting up other system properties,
349 // as some of them may depend on launcher type.
350 for (int index = 0; index < args->nOptions; index++) {
351 const JavaVMOption* option = args->options + index;
352 const char* tail;
353
354 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
355 process_java_launcher_argument(tail, option->extraInfo);
356 continue;
357 }
358 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
359 if (strcmp(tail, "true") == 0) {
360 _sun_java_launcher_is_altjvm = true;
361 }
362 continue;
363 }
364 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
365 _sun_java_launcher_pid = atoi(tail);
366 continue;
367 }
368 }
369 }
370
371 // Initialize system properties key and value.
372 void Arguments::init_system_properties() {
373
374 // Set up _system_boot_class_path which is not a property but
375 // relies heavily on argument processing and the jdk.boot.class.path.append
376 // property. It is used to store the underlying system boot class path.
377 _system_boot_class_path = new PathString(NULL);
378
379 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
380 "Java Virtual Machine Specification", false));
381 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
382 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
383 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
384 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
385
386 // Following are JVMTI agent writable properties.
387 // Properties values are set to NULL and they are
388 // os specific they are initialized in os::init_system_properties_values().
389 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
390 _java_library_path = new SystemProperty("java.library.path", NULL, true);
391 _java_home = new SystemProperty("java.home", NULL, true);
392 _java_class_path = new SystemProperty("java.class.path", "", true);
393 // jdk.boot.class.path.append is a non-writeable, internal property.
394 // It can only be set by either:
395 // - -Xbootclasspath/a:
396 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
397 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
398
399 // Add to System Property list.
400 PropertyList_add(&_system_properties, _sun_boot_library_path);
401 PropertyList_add(&_system_properties, _java_library_path);
402 PropertyList_add(&_system_properties, _java_home);
403 PropertyList_add(&_system_properties, _java_class_path);
404 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
405
406 // Set OS specific system properties values
407 os::init_system_properties_values();
408 }
409
410 // Update/Initialize System properties after JDK version number is known
411 void Arguments::init_version_specific_system_properties() {
412 enum { bufsz = 16 };
413 char buffer[bufsz];
414 const char* spec_vendor = "Oracle Corporation";
415 uint32_t spec_version = JDK_Version::current().major_version();
416
417 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
418
419 PropertyList_add(&_system_properties,
420 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
421 PropertyList_add(&_system_properties,
422 new SystemProperty("java.vm.specification.version", buffer, false));
423 PropertyList_add(&_system_properties,
424 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
425 }
426
427 /*
428 * -XX argument processing:
429 *
430 * -XX arguments are defined in several places, such as:
431 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
432 * -XX arguments are parsed in parse_argument().
433 * -XX argument bounds checking is done in check_vm_args_consistency().
434 *
435 * Over time -XX arguments may change. There are mechanisms to handle common cases:
436 *
437 * ALIASED: An option that is simply another name for another option. This is often
438 * part of the process of deprecating a flag, but not all aliases need
439 * to be deprecated.
440 *
441 * Create an alias for an option by adding the old and new option names to the
442 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
443 *
444 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
445 * support may be removed in the future. Both regular and aliased options may be
446 * deprecated.
447 *
448 * Add a deprecation warning for an option (or alias) by adding an entry in the
449 * "special_jvm_flags" table and setting the "deprecated_in" field.
450 * Often an option "deprecated" in one major release will
451 * be made "obsolete" in the next. In this case the entry should also have its
452 * "obsolete_in" field set.
453 *
454 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
455 * on the command line. A warning is printed to let the user know that option might not
456 * be accepted in the future.
457 *
458 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
459 * table and setting the "obsolete_in" field.
460 *
461 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
462 * to the current JDK version. The system will flatly refuse to admit the existence of
463 * the flag. This allows a flag to die automatically over JDK releases.
464 *
465 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
466 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
467 * - Newly obsolete or expired deprecated options should have their global variable
468 * definitions removed (from globals.hpp, etc) and related implementations removed.
469 *
470 * Recommended approach for removing options:
471 *
472 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
473 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
474 *
475 * To remove internal options (e.g. diagnostic, experimental, develop options), use
476 * a 2-step model adding major release numbers to the obsolete and expire columns.
477 *
478 * To change the name of an option, use the alias table as well as a 2-step
479 * model adding major release numbers to the deprecate and expire columns.
480 * Think twice about aliasing commonly used customer options.
481 *
482 * There are times when it is appropriate to leave a future release number as undefined.
483 *
484 * Tests: Aliases should be tested in VMAliasOptions.java.
485 * Deprecated options should be tested in VMDeprecatedOptions.java.
486 */
487
488 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
489 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
490 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
491 // the command-line as usual, but will issue a warning.
492 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
493 // the command-line, while issuing a warning and ignoring the flag value.
494 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
495 // existence of the flag.
496 //
497 // MANUAL CLEANUP ON JDK VERSION UPDATES:
498 // This table ensures that the handling of options will update automatically when the JDK
499 // version is incremented, but the source code needs to be cleanup up manually:
500 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
501 // variable should be removed, as well as users of the variable.
502 // - As "deprecated" options age into "obsolete" options, move the entry into the
503 // "Obsolete Flags" section of the table.
504 // - All expired options should be removed from the table.
505 static SpecialFlag const special_jvm_flags[] = {
506 // -------------- Deprecated Flags --------------
507 // --- Non-alias flags - sorted by obsolete_in then expired_in:
508 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
509 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
511 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
512 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
515 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
516 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
517 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
518 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
519 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
522 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
523
524 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
525 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
528 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
529
530 // -------------- Obsolete Flags - sorted by expired_in --------------
531 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
532 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
533 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
534 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
535 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
536 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
537 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
538 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
539 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
540 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
541 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
542 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
543 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
544 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
545 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
546
547 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
548 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
549 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
550 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
551 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
552 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
554 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
555 #endif
556
557 { NULL, JDK_Version(0), JDK_Version(0) }
558 };
559
560 // Flags that are aliases for other flags.
561 typedef struct {
562 const char* alias_name;
563 const char* real_name;
564 } AliasedFlag;
565
566 static AliasedFlag const aliased_jvm_flags[] = {
567 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
568 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
569 { NULL, NULL}
570 };
571
572 // NOTE: A compatibility request will be necessary for each alias to be removed.
573 static AliasedLoggingFlag const aliased_logging_flags[] = {
574 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
575 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
576 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
577 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
578 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
579 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
580 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
581 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
582 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
583 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
584 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
585 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
586 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
587 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
588 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
589 };
590
591 #ifndef PRODUCT
592 // These options are removed in jdk9. Remove this code for jdk10.
593 static AliasedFlag const removed_develop_logging_flags[] = {
594 { "TraceClassInitialization", "-Xlog:class+init" },
595 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
596 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
597 { "TraceItables", "-Xlog:itables=debug" },
598 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
599 { "TraceSafepoint", "-Xlog:safepoint=debug" },
600 { "TraceStartupTime", "-Xlog:startuptime" },
601 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
602 { "PrintVtables", "-Xlog:vtables=debug" },
603 { "VerboseVerification", "-Xlog:verification" },
604 { NULL, NULL }
605 };
606 #endif //PRODUCT
607
608 // Return true if "v" is less than "other", where "other" may be "undefined".
609 static bool version_less_than(JDK_Version v, JDK_Version other) {
610 assert(!v.is_undefined(), "must be defined");
611 if (!other.is_undefined() && v.compare(other) >= 0) {
612 return false;
613 } else {
614 return true;
615 }
616 }
617
618 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
619
620 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
621 // Allow extensions to have priority
622 if (lookup_special_flag_ext(flag_name, flag)) {
623 return true;
624 }
625
626 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
627 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
628 flag = special_jvm_flags[i];
629 return true;
630 }
631 }
632 return false;
633 }
634
635 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
636 assert(version != NULL, "Must provide a version buffer");
637 SpecialFlag flag;
638 if (lookup_special_flag(flag_name, flag)) {
639 if (!flag.obsolete_in.is_undefined()) {
640 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
641 *version = flag.obsolete_in;
642 return true;
643 }
644 }
645 }
646 return false;
647 }
648
649 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
650 assert(version != NULL, "Must provide a version buffer");
651 SpecialFlag flag;
652 if (lookup_special_flag(flag_name, flag)) {
653 if (!flag.deprecated_in.is_undefined()) {
654 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
655 version_less_than(JDK_Version::current(), flag.expired_in)) {
656 *version = flag.deprecated_in;
657 return 1;
658 } else {
659 return -1;
660 }
661 }
662 }
663 return 0;
664 }
665
666 #ifndef PRODUCT
667 const char* Arguments::removed_develop_logging_flag_name(const char* name){
668 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
669 const AliasedFlag& flag = removed_develop_logging_flags[i];
670 if (strcmp(flag.alias_name, name) == 0) {
671 return flag.real_name;
672 }
673 }
674 return NULL;
675 }
676 #endif // PRODUCT
677
678 const char* Arguments::real_flag_name(const char *flag_name) {
679 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
680 const AliasedFlag& flag_status = aliased_jvm_flags[i];
681 if (strcmp(flag_status.alias_name, flag_name) == 0) {
682 return flag_status.real_name;
683 }
684 }
685 return flag_name;
686 }
687
688 #ifdef ASSERT
689 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
690 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
691 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
692 return true;
693 }
694 }
695 return false;
696 }
697
698 // Verifies the correctness of the entries in the special_jvm_flags table.
699 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
700 // version being earlier than the deprecation version, then a warning is issued
701 // and verification fails - by returning false. If it is detected that the table
702 // is out of date, with respect to the current version, then a warning is issued
703 // but verification does not fail. This allows the VM to operate when the version
704 // is first updated, without needing to update all the impacted flags at the
705 // same time.
706 static bool verify_special_jvm_flags() {
707 bool success = true;
708 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
709 const SpecialFlag& flag = special_jvm_flags[i];
710 if (lookup_special_flag(flag.name, i)) {
711 warning("Duplicate special flag declaration \"%s\"", flag.name);
712 success = false;
713 }
714 if (flag.deprecated_in.is_undefined() &&
715 flag.obsolete_in.is_undefined()) {
716 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
717 success = false;
718 }
719
720 if (!flag.deprecated_in.is_undefined()) {
721 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
722 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
723 success = false;
724 }
725
726 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
727 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
728 success = false;
729 }
730 }
731
732 if (!flag.obsolete_in.is_undefined()) {
733 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
734 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
735 success = false;
736 }
737
738 // if flag has become obsolete it should not have a "globals" flag defined anymore.
739 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
740 if (Flag::find_flag(flag.name) != NULL) {
741 // Temporarily disable the warning: 8196739
742 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
743 }
744 }
745 }
746
747 if (!flag.expired_in.is_undefined()) {
748 // if flag has become expired it should not have a "globals" flag defined anymore.
749 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
750 if (Flag::find_flag(flag.name) != NULL) {
751 // Temporarily disable the warning: 8196739
752 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
753 }
754 }
755 }
756
757 }
758 return success;
759 }
760 #endif
761
762 // Parses a size specification string.
763 bool Arguments::atojulong(const char *s, julong* result) {
764 julong n = 0;
765
766 // First char must be a digit. Don't allow negative numbers or leading spaces.
767 if (!isdigit(*s)) {
768 return false;
769 }
770
771 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
772 char* remainder;
773 errno = 0;
774 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
775 if (errno != 0) {
776 return false;
777 }
778
779 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
780 if (remainder == s || strlen(remainder) > 1) {
781 return false;
782 }
783
784 switch (*remainder) {
785 case 'T': case 't':
786 *result = n * G * K;
787 // Check for overflow.
788 if (*result/((julong)G * K) != n) return false;
789 return true;
790 case 'G': case 'g':
791 *result = n * G;
792 if (*result/G != n) return false;
793 return true;
794 case 'M': case 'm':
795 *result = n * M;
796 if (*result/M != n) return false;
797 return true;
798 case 'K': case 'k':
799 *result = n * K;
800 if (*result/K != n) return false;
801 return true;
802 case '\0':
803 *result = n;
804 return true;
805 default:
806 return false;
807 }
808 }
809
810 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
811 if (size < min_size) return arg_too_small;
812 if (size > max_size) return arg_too_big;
813 return arg_in_range;
814 }
815
816 // Describe an argument out of range error
817 void Arguments::describe_range_error(ArgsRange errcode) {
818 switch(errcode) {
819 case arg_too_big:
820 jio_fprintf(defaultStream::error_stream(),
821 "The specified size exceeds the maximum "
822 "representable size.\n");
823 break;
824 case arg_too_small:
825 case arg_unreadable:
826 case arg_in_range:
827 // do nothing for now
828 break;
829 default:
830 ShouldNotReachHere();
831 }
832 }
833
834 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
835 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
836 return true;
837 } else {
838 return false;
839 }
840 }
841
842 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
843 char* end;
844 errno = 0;
845 double v = strtod(value, &end);
846 if ((errno != 0) || (*end != 0)) {
847 return false;
848 }
849
850 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
851 return true;
852 }
853 return false;
854 }
855
856 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
857 julong v;
858 int int_v;
859 intx intx_v;
860 bool is_neg = false;
861 Flag* result = Flag::find_flag(name, strlen(name));
862
863 if (result == NULL) {
864 return false;
865 }
866
867 // Check the sign first since atojulong() parses only unsigned values.
868 if (*value == '-') {
869 if (!result->is_intx() && !result->is_int()) {
870 return false;
871 }
872 value++;
873 is_neg = true;
874 }
875 if (!Arguments::atojulong(value, &v)) {
876 return false;
877 }
878 if (result->is_int()) {
879 int_v = (int) v;
880 if (is_neg) {
881 int_v = -int_v;
882 }
883 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
884 } else if (result->is_uint()) {
885 uint uint_v = (uint) v;
886 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
887 } else if (result->is_intx()) {
888 intx_v = (intx) v;
889 if (is_neg) {
890 intx_v = -intx_v;
891 }
892 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
893 } else if (result->is_uintx()) {
894 uintx uintx_v = (uintx) v;
895 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
896 } else if (result->is_uint64_t()) {
897 uint64_t uint64_t_v = (uint64_t) v;
898 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
899 } else if (result->is_size_t()) {
900 size_t size_t_v = (size_t) v;
901 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
902 } else if (result->is_double()) {
903 double double_v = (double) v;
904 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
905 } else {
906 return false;
907 }
908 }
909
910 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
911 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
912 // Contract: CommandLineFlags always returns a pointer that needs freeing.
913 FREE_C_HEAP_ARRAY(char, value);
914 return true;
915 }
916
917 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
918 const char* old_value = "";
919 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
920 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
921 size_t new_len = strlen(new_value);
922 const char* value;
923 char* free_this_too = NULL;
924 if (old_len == 0) {
925 value = new_value;
926 } else if (new_len == 0) {
927 value = old_value;
928 } else {
929 size_t length = old_len + 1 + new_len + 1;
930 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
931 // each new setting adds another LINE to the switch:
932 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
933 value = buf;
934 free_this_too = buf;
935 }
936 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
937 // CommandLineFlags always returns a pointer that needs freeing.
938 FREE_C_HEAP_ARRAY(char, value);
939 if (free_this_too != NULL) {
940 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
941 FREE_C_HEAP_ARRAY(char, free_this_too);
942 }
943 return true;
944 }
945
946 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
947 const char* real_name = real_flag_name(arg);
948 JDK_Version since = JDK_Version();
949 switch (is_deprecated_flag(arg, &since)) {
950 case -1:
951 return NULL; // obsolete or expired, don't process normally
952 case 0:
953 return real_name;
954 case 1: {
955 if (warn) {
956 char version[256];
957 since.to_string(version, sizeof(version));
958 if (real_name != arg) {
959 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
960 arg, version, real_name);
961 } else {
962 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
963 arg, version);
964 }
965 }
966 return real_name;
967 }
968 }
969 ShouldNotReachHere();
970 return NULL;
971 }
972
973 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
974 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
975 // Set tagset string buffer at max size of 256, large enough for any alias tagset
976 const int max_tagset_size = 256;
977 int max_tagset_len = max_tagset_size - 1;
978 char tagset_buffer[max_tagset_size];
979 tagset_buffer[0] = '\0';
980
981 // Write tag-set for aliased logging option, in string list form
982 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
983 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
984 if (i > 0) {
985 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
986 }
987 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
988 }
989 if (!alf.exactMatch) {
990 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
991 }
992 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
993 (on) ? "+" : "-",
994 name,
995 tagset_buffer,
996 (on) ? LogLevel::name(alf.level) : "off");
997 }
998
999 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1000 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1001 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1002 if (strcmp(alf.alias_name, name) == 0) {
1003 log_deprecated_flag(name, on, alf);
1004 return alf;
1005 }
1006 }
1007 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1008 return a;
1009 }
1010
1011 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1012
1013 // range of acceptable characters spelled out for portability reasons
1014 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1015 #define BUFLEN 255
1016 char name[BUFLEN+1];
1017 char dummy;
1018 const char* real_name;
1019 bool warn_if_deprecated = true;
1020
1021 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1022 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1023 if (alf.alias_name != NULL){
1024 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1025 return true;
1026 }
1027 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1028 if (real_name == NULL) {
1029 return false;
1030 }
1031 return set_bool_flag(real_name, false, origin);
1032 }
1033 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1034 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1035 if (alf.alias_name != NULL){
1036 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1037 return true;
1038 }
1039 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1040 if (real_name == NULL) {
1041 return false;
1042 }
1043 return set_bool_flag(real_name, true, origin);
1044 }
1045
1046 char punct;
1047 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1048 const char* value = strchr(arg, '=') + 1;
1049 Flag* flag;
1050
1051 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1052 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1053 if (alf.alias_name != NULL) {
1054 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1055 return true;
1056 }
1057 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1058 if (real_name == NULL) {
1059 return false;
1060 }
1061 flag = Flag::find_flag(real_name);
1062 if (flag != NULL && flag->is_ccstr()) {
1063 if (flag->ccstr_accumulates()) {
1064 return append_to_string_flag(real_name, value, origin);
1065 } else {
1066 if (value[0] == '\0') {
1067 value = NULL;
1068 }
1069 return set_string_flag(real_name, value, origin);
1070 }
1071 } else {
1072 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1073 }
1074 }
1075
1076 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1077 const char* value = strchr(arg, '=') + 1;
1078 // -XX:Foo:=xxx will reset the string flag to the given value.
1079 if (value[0] == '\0') {
1080 value = NULL;
1081 }
1082 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1083 if (real_name == NULL) {
1084 return false;
1085 }
1086 return set_string_flag(real_name, value, origin);
1087 }
1088
1089 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1090 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1091 #define NUMBER_RANGE "[0123456789eE+-]"
1092 char value[BUFLEN + 1];
1093 char value2[BUFLEN + 1];
1094 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1095 // Looks like a floating-point number -- try again with more lenient format string
1096 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1097 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1098 if (real_name == NULL) {
1099 return false;
1100 }
1101 return set_fp_numeric_flag(real_name, value, origin);
1102 }
1103 }
1104
1105 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1106 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1107 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1108 if (real_name == NULL) {
1109 return false;
1110 }
1111 return set_numeric_flag(real_name, value, origin);
1112 }
1113
1114 return false;
1115 }
1116
1117 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1118 assert(bldarray != NULL, "illegal argument");
1119
1120 if (arg == NULL) {
1121 return;
1122 }
1123
1124 int new_count = *count + 1;
1125
1126 // expand the array and add arg to the last element
1127 if (*bldarray == NULL) {
1128 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1129 } else {
1130 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1131 }
1132 (*bldarray)[*count] = os::strdup_check_oom(arg);
1133 *count = new_count;
1134 }
1135
1136 void Arguments::build_jvm_args(const char* arg) {
1137 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1138 }
1139
1140 void Arguments::build_jvm_flags(const char* arg) {
1141 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1142 }
1143
1144 // utility function to return a string that concatenates all
1145 // strings in a given char** array
1146 const char* Arguments::build_resource_string(char** args, int count) {
1147 if (args == NULL || count == 0) {
1148 return NULL;
1149 }
1150 size_t length = 0;
1151 for (int i = 0; i < count; i++) {
1152 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1153 }
1154 char* s = NEW_RESOURCE_ARRAY(char, length);
1155 char* dst = s;
1156 for (int j = 0; j < count; j++) {
1157 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1158 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1159 dst += offset;
1160 length -= offset;
1161 }
1162 return (const char*) s;
1163 }
1164
1165 void Arguments::print_on(outputStream* st) {
1166 st->print_cr("VM Arguments:");
1167 if (num_jvm_flags() > 0) {
1168 st->print("jvm_flags: "); print_jvm_flags_on(st);
1169 st->cr();
1170 }
1171 if (num_jvm_args() > 0) {
1172 st->print("jvm_args: "); print_jvm_args_on(st);
1173 st->cr();
1174 }
1175 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1176 if (_java_class_path != NULL) {
1177 char* path = _java_class_path->value();
1178 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1179 }
1180 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1181 }
1182
1183 void Arguments::print_summary_on(outputStream* st) {
1184 // Print the command line. Environment variables that are helpful for
1185 // reproducing the problem are written later in the hs_err file.
1186 // flags are from setting file
1187 if (num_jvm_flags() > 0) {
1188 st->print_raw("Settings File: ");
1189 print_jvm_flags_on(st);
1190 st->cr();
1191 }
1192 // args are the command line and environment variable arguments.
1193 st->print_raw("Command Line: ");
1194 if (num_jvm_args() > 0) {
1195 print_jvm_args_on(st);
1196 }
1197 // this is the classfile and any arguments to the java program
1198 if (java_command() != NULL) {
1199 st->print("%s", java_command());
1200 }
1201 st->cr();
1202 }
1203
1204 void Arguments::print_jvm_flags_on(outputStream* st) {
1205 if (_num_jvm_flags > 0) {
1206 for (int i=0; i < _num_jvm_flags; i++) {
1207 st->print("%s ", _jvm_flags_array[i]);
1208 }
1209 }
1210 }
1211
1212 void Arguments::print_jvm_args_on(outputStream* st) {
1213 if (_num_jvm_args > 0) {
1214 for (int i=0; i < _num_jvm_args; i++) {
1215 st->print("%s ", _jvm_args_array[i]);
1216 }
1217 }
1218 }
1219
1220 bool Arguments::process_argument(const char* arg,
1221 jboolean ignore_unrecognized,
1222 Flag::Flags origin) {
1223 JDK_Version since = JDK_Version();
1224
1225 if (parse_argument(arg, origin)) {
1226 return true;
1227 }
1228
1229 // Determine if the flag has '+', '-', or '=' characters.
1230 bool has_plus_minus = (*arg == '+' || *arg == '-');
1231 const char* const argname = has_plus_minus ? arg + 1 : arg;
1232
1233 size_t arg_len;
1234 const char* equal_sign = strchr(argname, '=');
1235 if (equal_sign == NULL) {
1236 arg_len = strlen(argname);
1237 } else {
1238 arg_len = equal_sign - argname;
1239 }
1240
1241 // Only make the obsolete check for valid arguments.
1242 if (arg_len <= BUFLEN) {
1243 // Construct a string which consists only of the argument name without '+', '-', or '='.
1244 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1245 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1246 if (is_obsolete_flag(stripped_argname, &since)) {
1247 char version[256];
1248 since.to_string(version, sizeof(version));
1249 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1250 return true;
1251 }
1252 #ifndef PRODUCT
1253 else {
1254 const char* replacement;
1255 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1256 log_warning(arguments)("%s has been removed. Please use %s instead.",
1257 stripped_argname,
1258 replacement);
1259 return false;
1260 }
1261 }
1262 #endif //PRODUCT
1263 }
1264
1265 // For locked flags, report a custom error message if available.
1266 // Otherwise, report the standard unrecognized VM option.
1267 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1268 if (found_flag != NULL) {
1269 char locked_message_buf[BUFLEN];
1270 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1271 if (strlen(locked_message_buf) == 0) {
1272 if (found_flag->is_bool() && !has_plus_minus) {
1273 jio_fprintf(defaultStream::error_stream(),
1274 "Missing +/- setting for VM option '%s'\n", argname);
1275 } else if (!found_flag->is_bool() && has_plus_minus) {
1276 jio_fprintf(defaultStream::error_stream(),
1277 "Unexpected +/- setting in VM option '%s'\n", argname);
1278 } else {
1279 jio_fprintf(defaultStream::error_stream(),
1280 "Improperly specified VM option '%s'\n", argname);
1281 }
1282 } else {
1283 #ifdef PRODUCT
1284 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1285 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1286 if (ignore_unrecognized && mismatched) {
1287 return true;
1288 }
1289 #endif
1290 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1291 }
1292 } else {
1293 if (ignore_unrecognized) {
1294 return true;
1295 }
1296 jio_fprintf(defaultStream::error_stream(),
1297 "Unrecognized VM option '%s'\n", argname);
1298 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1299 if (fuzzy_matched != NULL) {
1300 jio_fprintf(defaultStream::error_stream(),
1301 "Did you mean '%s%s%s'? ",
1302 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1303 fuzzy_matched->_name,
1304 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1305 }
1306 }
1307
1308 // allow for commandline "commenting out" options like -XX:#+Verbose
1309 return arg[0] == '#';
1310 }
1311
1312 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1313 FILE* stream = fopen(file_name, "rb");
1314 if (stream == NULL) {
1315 if (should_exist) {
1316 jio_fprintf(defaultStream::error_stream(),
1317 "Could not open settings file %s\n", file_name);
1318 return false;
1319 } else {
1320 return true;
1321 }
1322 }
1323
1324 char token[1024];
1325 int pos = 0;
1326
1327 bool in_white_space = true;
1328 bool in_comment = false;
1329 bool in_quote = false;
1330 char quote_c = 0;
1331 bool result = true;
1332
1333 int c = getc(stream);
1334 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1335 if (in_white_space) {
1336 if (in_comment) {
1337 if (c == '\n') in_comment = false;
1338 } else {
1339 if (c == '#') in_comment = true;
1340 else if (!isspace(c)) {
1341 in_white_space = false;
1342 token[pos++] = c;
1343 }
1344 }
1345 } else {
1346 if (c == '\n' || (!in_quote && isspace(c))) {
1347 // token ends at newline, or at unquoted whitespace
1348 // this allows a way to include spaces in string-valued options
1349 token[pos] = '\0';
1350 logOption(token);
1351 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1352 build_jvm_flags(token);
1353 pos = 0;
1354 in_white_space = true;
1355 in_quote = false;
1356 } else if (!in_quote && (c == '\'' || c == '"')) {
1357 in_quote = true;
1358 quote_c = c;
1359 } else if (in_quote && (c == quote_c)) {
1360 in_quote = false;
1361 } else {
1362 token[pos++] = c;
1363 }
1364 }
1365 c = getc(stream);
1366 }
1367 if (pos > 0) {
1368 token[pos] = '\0';
1369 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1370 build_jvm_flags(token);
1371 }
1372 fclose(stream);
1373 return result;
1374 }
1375
1376 //=============================================================================================================
1377 // Parsing of properties (-D)
1378
1379 const char* Arguments::get_property(const char* key) {
1380 return PropertyList_get_value(system_properties(), key);
1381 }
1382
1383 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1384 const char* eq = strchr(prop, '=');
1385 const char* key;
1386 const char* value = "";
1387
1388 if (eq == NULL) {
1389 // property doesn't have a value, thus use passed string
1390 key = prop;
1391 } else {
1392 // property have a value, thus extract it and save to the
1393 // allocated string
1394 size_t key_len = eq - prop;
1395 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1396
1397 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1398 key = tmp_key;
1399
1400 value = &prop[key_len + 1];
1401 }
1402
1403 if (strcmp(key, "java.compiler") == 0) {
1404 process_java_compiler_argument(value);
1405 // Record value in Arguments, but let it get passed to Java.
1406 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1407 strcmp(key, "sun.java.launcher.pid") == 0) {
1408 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1409 // private and are processed in process_sun_java_launcher_properties();
1410 // the sun.java.launcher property is passed on to the java application
1411 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1412 // append is true, writable is true, internal is false
1413 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1414 WriteableProperty, ExternalProperty);
1415 } else {
1416 if (strcmp(key, "sun.java.command") == 0) {
1417 char *old_java_command = _java_command;
1418 _java_command = os::strdup_check_oom(value, mtArguments);
1419 if (old_java_command != NULL) {
1420 os::free(old_java_command);
1421 }
1422 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1423 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1424 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1425 // its value without going through the property list or making a Java call.
1426 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1427 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1428 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1429 os::free((void *)old_java_vendor_url_bug);
1430 }
1431 }
1432
1433 // Create new property and add at the end of the list
1434 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1435 }
1436
1437 if (key != prop) {
1438 // SystemProperty copy passed value, thus free previously allocated
1439 // memory
1440 FreeHeap((void *)key);
1441 }
1442
1443 return true;
1444 }
1445
1446 #if INCLUDE_CDS
1447 void Arguments::check_unsupported_dumping_properties() {
1448 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1449 const char* unsupported_properties[] = { "jdk.module.main",
1450 "jdk.module.limitmods",
1451 "jdk.module.path",
1452 "jdk.module.upgrade.path",
1453 "jdk.module.patch.0" };
1454 const char* unsupported_options[] = { "-m", // cannot use at dump time
1455 "--limit-modules", // ignored at dump time
1456 "--module-path", // ignored at dump time
1457 "--upgrade-module-path", // ignored at dump time
1458 "--patch-module" // ignored at dump time
1459 };
1460 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1461 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1462 // vm will exit with an error message. Otherwise, it will print an informational message if
1463 // -Xlog:cds is enabled.
1464 uint info_idx = 1;
1465 SystemProperty* sp = system_properties();
1466 while (sp != NULL) {
1467 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1468 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1469 if (i < info_idx) {
1470 vm_exit_during_initialization(
1471 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1472 } else {
1473 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1474 unsupported_options[i]);
1475 }
1476 }
1477 }
1478 sp = sp->next();
1479 }
1480
1481 // Check for an exploded module build in use with -Xshare:dump.
1482 if (!has_jimage()) {
1483 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1484 }
1485 }
1486 #endif
1487
1488 //===========================================================================================================
1489 // Setting int/mixed/comp mode flags
1490
1491 void Arguments::set_mode_flags(Mode mode) {
1492 // Set up default values for all flags.
1493 // If you add a flag to any of the branches below,
1494 // add a default value for it here.
1495 set_java_compiler(false);
1496 _mode = mode;
1497
1498 // Ensure Agent_OnLoad has the correct initial values.
1499 // This may not be the final mode; mode may change later in onload phase.
1500 PropertyList_unique_add(&_system_properties, "java.vm.info",
1501 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1502
1503 UseInterpreter = true;
1504 UseCompiler = true;
1505 UseLoopCounter = true;
1506
1507 // Default values may be platform/compiler dependent -
1508 // use the saved values
1509 ClipInlining = Arguments::_ClipInlining;
1510 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1511 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1512 BackgroundCompilation = Arguments::_BackgroundCompilation;
1513 if (TieredCompilation) {
1514 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1515 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1516 }
1517 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1518 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1519 }
1520 }
1521
1522 // Change from defaults based on mode
1523 switch (mode) {
1524 default:
1525 ShouldNotReachHere();
1526 break;
1527 case _int:
1528 UseCompiler = false;
1529 UseLoopCounter = false;
1530 AlwaysCompileLoopMethods = false;
1531 UseOnStackReplacement = false;
1532 break;
1533 case _mixed:
1534 // same as default
1535 break;
1536 case _comp:
1537 UseInterpreter = false;
1538 BackgroundCompilation = false;
1539 ClipInlining = false;
1540 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1541 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1542 // compile a level 4 (C2) and then continue executing it.
1543 if (TieredCompilation) {
1544 Tier3InvokeNotifyFreqLog = 0;
1545 Tier4InvocationThreshold = 0;
1546 }
1547 break;
1548 }
1549 }
1550
1551 // Conflict: required to use shared spaces (-Xshare:on), but
1552 // incompatible command line options were chosen.
1553 static void no_shared_spaces(const char* message) {
1554 if (RequireSharedSpaces) {
1555 jio_fprintf(defaultStream::error_stream(),
1556 "Class data sharing is inconsistent with other specified options.\n");
1557 vm_exit_during_initialization("Unable to use shared archive.", message);
1558 } else {
1559 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1560 }
1561 }
1562
1563 // Returns threshold scaled with the value of scale.
1564 // If scale < 0.0, threshold is returned without scaling.
1565 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1566 if (scale == 1.0 || scale < 0.0) {
1567 return threshold;
1568 } else {
1569 return (intx)(threshold * scale);
1570 }
1571 }
1572
1573 // Returns freq_log scaled with the value of scale.
1574 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1575 // If scale < 0.0, freq_log is returned without scaling.
1576 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1577 // Check if scaling is necessary or if negative value was specified.
1578 if (scale == 1.0 || scale < 0.0) {
1579 return freq_log;
1580 }
1581 // Check values to avoid calculating log2 of 0.
1582 if (scale == 0.0 || freq_log == 0) {
1583 return 0;
1584 }
1585 // Determine the maximum notification frequency value currently supported.
1586 // The largest mask value that the interpreter/C1 can handle is
1587 // of length InvocationCounter::number_of_count_bits. Mask values are always
1588 // one bit shorter then the value of the notification frequency. Set
1589 // max_freq_bits accordingly.
1590 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1591 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1592 if (scaled_freq == 0) {
1593 // Return 0 right away to avoid calculating log2 of 0.
1594 return 0;
1595 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1596 return max_freq_bits;
1597 } else {
1598 return log2_intptr(scaled_freq);
1599 }
1600 }
1601
1602 void Arguments::set_tiered_flags() {
1603 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1604 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1605 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1606 }
1607 if (CompilationPolicyChoice < 2) {
1608 vm_exit_during_initialization(
1609 "Incompatible compilation policy selected", NULL);
1610 }
1611 // Increase the code cache size - tiered compiles a lot more.
1612 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1613 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1614 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1615 }
1616 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1617 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1618 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1619 }
1620 if (!UseInterpreter) { // -Xcomp
1621 Tier3InvokeNotifyFreqLog = 0;
1622 Tier4InvocationThreshold = 0;
1623 }
1624
1625 if (CompileThresholdScaling < 0) {
1626 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1627 }
1628
1629 // Scale tiered compilation thresholds.
1630 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1631 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1632 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1633 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1634
1635 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1636 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1637 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1638 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1639
1640 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1641 // once these thresholds become supported.
1642
1643 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1644 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1645
1646 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1647 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1648
1649 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1650
1651 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1652 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1653 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1654 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1655 }
1656 }
1657
1658 void set_object_alignment() {
1659 // Object alignment.
1660 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1661 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1662 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1663 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1664 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1665 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1666
1667 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1668 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1669
1670 // Oop encoding heap max
1671 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1672
1673 if (SurvivorAlignmentInBytes == 0) {
1674 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1675 }
1676 }
1677
1678 size_t Arguments::max_heap_for_compressed_oops() {
1679 // Avoid sign flip.
1680 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1681 // We need to fit both the NULL page and the heap into the memory budget, while
1682 // keeping alignment constraints of the heap. To guarantee the latter, as the
1683 // NULL page is located before the heap, we pad the NULL page to the conservative
1684 // maximum alignment that the GC may ever impose upon the heap.
1685 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1686 _conservative_max_heap_alignment);
1687
1688 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1689 NOT_LP64(ShouldNotReachHere(); return 0);
1690 }
1691
1692 void Arguments::set_use_compressed_oops() {
1693 #ifndef ZERO
1694 #ifdef _LP64
1695 // MaxHeapSize is not set up properly at this point, but
1696 // the only value that can override MaxHeapSize if we are
1697 // to use UseCompressedOops is InitialHeapSize.
1698 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1699
1700 if (max_heap_size <= max_heap_for_compressed_oops()) {
1701 #if !defined(COMPILER1) || defined(TIERED)
1702 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1703 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1704 }
1705 #endif
1706 } else {
1707 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1708 warning("Max heap size too large for Compressed Oops");
1709 FLAG_SET_DEFAULT(UseCompressedOops, false);
1710 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1711 }
1712 }
1713 #endif // _LP64
1714 #endif // ZERO
1715 }
1716
1717
1718 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1719 // set_use_compressed_oops().
1720 void Arguments::set_use_compressed_klass_ptrs() {
1721 #ifndef ZERO
1722 #ifdef _LP64
1723 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1724 if (!UseCompressedOops) {
1725 if (UseCompressedClassPointers) {
1726 warning("UseCompressedClassPointers requires UseCompressedOops");
1727 }
1728 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1729 } else {
1730 // Turn on UseCompressedClassPointers too
1731 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1732 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1733 }
1734 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1735 if (UseCompressedClassPointers) {
1736 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1737 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1738 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1739 }
1740 }
1741 }
1742 #endif // _LP64
1743 #endif // !ZERO
1744 }
1745
1746 void Arguments::set_conservative_max_heap_alignment() {
1747 // The conservative maximum required alignment for the heap is the maximum of
1748 // the alignments imposed by several sources: any requirements from the heap
1749 // itself, the collector policy and the maximum page size we may run the VM
1750 // with.
1751 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1752 _conservative_max_heap_alignment = MAX4(heap_alignment,
1753 (size_t)os::vm_allocation_granularity(),
1754 os::max_page_size(),
1755 CollectorPolicy::compute_heap_alignment());
1756 }
1757
1758 #ifdef TIERED
1759 bool Arguments::compilation_mode_selected() {
1760 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1761 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1762
1763 }
1764
1765 void Arguments::select_compilation_mode_ergonomically() {
1766 #if defined(_WINDOWS) && !defined(_LP64)
1767 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1768 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1769 }
1770 #endif
1771 if (NeverActAsServerClassMachine) {
1772 set_client_compilation_mode();
1773 }
1774 }
1775 #endif //TIERED
1776
1777 #if INCLUDE_JVMCI
1778 void Arguments::set_jvmci_specific_flags() {
1779 if (UseJVMCICompiler) {
1780 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1781 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1782 }
1783 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1784 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1785 }
1786 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1787 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1788 }
1789 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1790 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1791 }
1792 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1793 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1794 }
1795 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1796 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1797 }
1798 if (TieredStopAtLevel != CompLevel_full_optimization) {
1799 // Currently JVMCI compiler can only work at the full optimization level
1800 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1801 TieredStopAtLevel = CompLevel_full_optimization;
1802 }
1803 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1804 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1805 }
1806 }
1807 }
1808 #endif
1809
1810 jint Arguments::set_ergonomics_flags() {
1811 #ifdef TIERED
1812 if (!compilation_mode_selected()) {
1813 select_compilation_mode_ergonomically();
1814 }
1815 #endif
1816
1817 jint gc_result = GCArguments::initialize();
1818 if (gc_result != JNI_OK) {
1819 return gc_result;
1820 }
1821
1822 #if COMPILER2_OR_JVMCI
1823 // Shared spaces work fine with other GCs but causes bytecode rewriting
1824 // to be disabled, which hurts interpreter performance and decreases
1825 // server performance. When -server is specified, keep the default off
1826 // unless it is asked for. Future work: either add bytecode rewriting
1827 // at link time, or rewrite bytecodes in non-shared methods.
1828 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1829 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1830 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1831 }
1832 #endif
1833
1834 #if defined(IA32)
1835 // Only server compiler can optimize safepoints well enough.
1836 if (!is_server_compilation_mode_vm()) {
1837 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1838 }
1839 #endif
1840
1841 set_conservative_max_heap_alignment();
1842
1843 #ifndef ZERO
1844 #ifdef _LP64
1845 set_use_compressed_oops();
1846
1847 // set_use_compressed_klass_ptrs() must be called after calling
1848 // set_use_compressed_oops().
1849 set_use_compressed_klass_ptrs();
1850
1851 // Also checks that certain machines are slower with compressed oops
1852 // in vm_version initialization code.
1853 #endif // _LP64
1854 #endif // !ZERO
1855
1856 return JNI_OK;
1857 }
1858
1859 void Arguments::set_gc_specific_flags() {
1860 // Set GC flags
1861 GCArguments::arguments()->initialize_flags();
1862 }
1863
1864 julong Arguments::limit_by_allocatable_memory(julong limit) {
1865 julong max_allocatable;
1866 julong result = limit;
1867 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1868 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1869 }
1870 return result;
1871 }
1872
1873 // Use static initialization to get the default before parsing
1874 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1875
1876 void Arguments::set_heap_size() {
1877 julong phys_mem =
1878 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1879 : (julong)MaxRAM;
1880
1881 // Convert deprecated flags
1882 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1883 !FLAG_IS_DEFAULT(MaxRAMFraction))
1884 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1885
1886 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1887 !FLAG_IS_DEFAULT(MinRAMFraction))
1888 MinRAMPercentage = 100.0 / MinRAMFraction;
1889
1890 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1891 !FLAG_IS_DEFAULT(InitialRAMFraction))
1892 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1893
1894 // If the maximum heap size has not been set with -Xmx,
1895 // then set it as fraction of the size of physical memory,
1896 // respecting the maximum and minimum sizes of the heap.
1897 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1898 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1899 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1900 if (reasonable_min < MaxHeapSize) {
1901 // Small physical memory, so use a minimum fraction of it for the heap
1902 reasonable_max = reasonable_min;
1903 } else {
1904 // Not-small physical memory, so require a heap at least
1905 // as large as MaxHeapSize
1906 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1907 }
1908
1909 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1910 // Limit the heap size to ErgoHeapSizeLimit
1911 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1912 }
1913 if (UseCompressedOops) {
1914 // Limit the heap size to the maximum possible when using compressed oops
1915 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1916
1917 // HeapBaseMinAddress can be greater than default but not less than.
1918 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1919 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1920 // matches compressed oops printing flags
1921 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1922 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1923 DefaultHeapBaseMinAddress,
1924 DefaultHeapBaseMinAddress/G,
1925 HeapBaseMinAddress);
1926 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1927 }
1928 }
1929
1930 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1931 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1932 // but it should be not less than default MaxHeapSize.
1933 max_coop_heap -= HeapBaseMinAddress;
1934 }
1935 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1936 }
1937 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1938
1939 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1940 // An initial heap size was specified on the command line,
1941 // so be sure that the maximum size is consistent. Done
1942 // after call to limit_by_allocatable_memory because that
1943 // method might reduce the allocation size.
1944 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1945 }
1946
1947 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1948 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1949 }
1950
1951 // If the minimum or initial heap_size have not been set or requested to be set
1952 // ergonomically, set them accordingly.
1953 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1954 julong reasonable_minimum = (julong)(OldSize + NewSize);
1955
1956 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1957
1958 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1959
1960 if (InitialHeapSize == 0) {
1961 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1962
1963 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1964 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1965
1966 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1967
1968 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1969 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1970 }
1971 // If the minimum heap size has not been set (via -Xms),
1972 // synchronize with InitialHeapSize to avoid errors with the default value.
1973 if (min_heap_size() == 0) {
1974 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1975 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1976 }
1977 }
1978 }
1979
1980 // This option inspects the machine and attempts to set various
1981 // parameters to be optimal for long-running, memory allocation
1982 // intensive jobs. It is intended for machines with large
1983 // amounts of cpu and memory.
1984 jint Arguments::set_aggressive_heap_flags() {
1985 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1986 // VM, but we may not be able to represent the total physical memory
1987 // available (like having 8gb of memory on a box but using a 32bit VM).
1988 // Thus, we need to make sure we're using a julong for intermediate
1989 // calculations.
1990 julong initHeapSize;
1991 julong total_memory = os::physical_memory();
1992
1993 if (total_memory < (julong) 256 * M) {
1994 jio_fprintf(defaultStream::error_stream(),
1995 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1996 vm_exit(1);
1997 }
1998
1999 // The heap size is half of available memory, or (at most)
2000 // all of possible memory less 160mb (leaving room for the OS
2001 // when using ISM). This is the maximum; because adaptive sizing
2002 // is turned on below, the actual space used may be smaller.
2003
2004 initHeapSize = MIN2(total_memory / (julong) 2,
2005 total_memory - (julong) 160 * M);
2006
2007 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2008
2009 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2010 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2011 return JNI_EINVAL;
2012 }
2013 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2014 return JNI_EINVAL;
2015 }
2016 // Currently the minimum size and the initial heap sizes are the same.
2017 set_min_heap_size(initHeapSize);
2018 }
2019 if (FLAG_IS_DEFAULT(NewSize)) {
2020 // Make the young generation 3/8ths of the total heap.
2021 if (FLAG_SET_CMDLINE(size_t, NewSize,
2022 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2023 return JNI_EINVAL;
2024 }
2025 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2026 return JNI_EINVAL;
2027 }
2028 }
2029
2030 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2031 FLAG_SET_DEFAULT(UseLargePages, true);
2032 #endif
2033
2034 // Increase some data structure sizes for efficiency
2035 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2036 return JNI_EINVAL;
2037 }
2038 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2039 return JNI_EINVAL;
2040 }
2041 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2042 return JNI_EINVAL;
2043 }
2044
2045 // See the OldPLABSize comment below, but replace 'after promotion'
2046 // with 'after copying'. YoungPLABSize is the size of the survivor
2047 // space per-gc-thread buffers. The default is 4kw.
2048 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2049 return JNI_EINVAL;
2050 }
2051
2052 // OldPLABSize is the size of the buffers in the old gen that
2053 // UseParallelGC uses to promote live data that doesn't fit in the
2054 // survivor spaces. At any given time, there's one for each gc thread.
2055 // The default size is 1kw. These buffers are rarely used, since the
2056 // survivor spaces are usually big enough. For specjbb, however, there
2057 // are occasions when there's lots of live data in the young gen
2058 // and we end up promoting some of it. We don't have a definite
2059 // explanation for why bumping OldPLABSize helps, but the theory
2060 // is that a bigger PLAB results in retaining something like the
2061 // original allocation order after promotion, which improves mutator
2062 // locality. A minor effect may be that larger PLABs reduce the
2063 // number of PLAB allocation events during gc. The value of 8kw
2064 // was arrived at by experimenting with specjbb.
2065 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2066 return JNI_EINVAL;
2067 }
2068
2069 // Enable parallel GC and adaptive generation sizing
2070 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2071 return JNI_EINVAL;
2072 }
2073
2074 // Encourage steady state memory management
2075 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2076 return JNI_EINVAL;
2077 }
2078
2079 // This appears to improve mutator locality
2080 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2081 return JNI_EINVAL;
2082 }
2083
2084 // Get around early Solaris scheduling bug
2085 // (affinity vs other jobs on system)
2086 // but disallow DR and offlining (5008695).
2087 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2088 return JNI_EINVAL;
2089 }
2090
2091 return JNI_OK;
2092 }
2093
2094 // This must be called after ergonomics.
2095 void Arguments::set_bytecode_flags() {
2096 if (!RewriteBytecodes) {
2097 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2098 }
2099 }
2100
2101 // Aggressive optimization flags -XX:+AggressiveOpts
2102 jint Arguments::set_aggressive_opts_flags() {
2103 #ifdef COMPILER2
2104 if (AggressiveUnboxing) {
2105 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2106 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2107 } else if (!EliminateAutoBox) {
2108 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2109 AggressiveUnboxing = false;
2110 }
2111 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2112 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2113 } else if (!DoEscapeAnalysis) {
2114 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2115 AggressiveUnboxing = false;
2116 }
2117 }
2118 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2119 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2120 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2121 }
2122 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2123 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2124 }
2125
2126 // Feed the cache size setting into the JDK
2127 char buffer[1024];
2128 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2129 if (!add_property(buffer)) {
2130 return JNI_ENOMEM;
2131 }
2132 }
2133 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2134 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2135 }
2136 #endif
2137
2138 if (AggressiveOpts) {
2139 // Sample flag setting code
2140 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2141 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2142 // }
2143 }
2144
2145 return JNI_OK;
2146 }
2147
2148 //===========================================================================================================
2149 // Parsing of java.compiler property
2150
2151 void Arguments::process_java_compiler_argument(const char* arg) {
2152 // For backwards compatibility, Djava.compiler=NONE or ""
2153 // causes us to switch to -Xint mode UNLESS -Xdebug
2154 // is also specified.
2155 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2156 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2157 }
2158 }
2159
2160 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2161 _sun_java_launcher = os::strdup_check_oom(launcher);
2162 }
2163
2164 bool Arguments::created_by_java_launcher() {
2165 assert(_sun_java_launcher != NULL, "property must have value");
2166 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2167 }
2168
2169 bool Arguments::sun_java_launcher_is_altjvm() {
2170 return _sun_java_launcher_is_altjvm;
2171 }
2172
2173 //===========================================================================================================
2174 // Parsing of main arguments
2175
2176 #if INCLUDE_JVMCI
2177 // Check consistency of jvmci vm argument settings.
2178 bool Arguments::check_jvmci_args_consistency() {
2179 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2180 }
2181 #endif //INCLUDE_JVMCI
2182
2183 // Check consistency of GC selection
2184 bool Arguments::check_gc_consistency() {
2185 // Ensure that the user has not selected conflicting sets
2186 // of collectors.
2187 uint i = 0;
2188 if (UseSerialGC) i++;
2189 if (UseConcMarkSweepGC) i++;
2190 if (UseParallelGC || UseParallelOldGC) i++;
2191 if (UseG1GC) i++;
2192 if (i > 1) {
2193 jio_fprintf(defaultStream::error_stream(),
2194 "Conflicting collector combinations in option list; "
2195 "please refer to the release notes for the combinations "
2196 "allowed\n");
2197 return false;
2198 }
2199
2200 return true;
2201 }
2202
2203 // Check the consistency of vm_init_args
2204 bool Arguments::check_vm_args_consistency() {
2205 // Method for adding checks for flag consistency.
2206 // The intent is to warn the user of all possible conflicts,
2207 // before returning an error.
2208 // Note: Needs platform-dependent factoring.
2209 bool status = true;
2210
2211 if (TLABRefillWasteFraction == 0) {
2212 jio_fprintf(defaultStream::error_stream(),
2213 "TLABRefillWasteFraction should be a denominator, "
2214 "not " SIZE_FORMAT "\n",
2215 TLABRefillWasteFraction);
2216 status = false;
2217 }
2218
2219 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2220 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2221 }
2222
2223 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2224 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2225 }
2226
2227 if (GCTimeLimit == 100) {
2228 // Turn off gc-overhead-limit-exceeded checks
2229 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2230 }
2231
2232 status = status && check_gc_consistency();
2233
2234 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2235 // insists that we hold the requisite locks so that the iteration is
2236 // MT-safe. For the verification at start-up and shut-down, we don't
2237 // yet have a good way of acquiring and releasing these locks,
2238 // which are not visible at the CollectedHeap level. We want to
2239 // be able to acquire these locks and then do the iteration rather
2240 // than just disable the lock verification. This will be fixed under
2241 // bug 4788986.
2242 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2243 if (VerifyDuringStartup) {
2244 warning("Heap verification at start-up disabled "
2245 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2246 VerifyDuringStartup = false; // Disable verification at start-up
2247 }
2248
2249 if (VerifyBeforeExit) {
2250 warning("Heap verification at shutdown disabled "
2251 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2252 VerifyBeforeExit = false; // Disable verification at shutdown
2253 }
2254 }
2255
2256 if (PrintNMTStatistics) {
2257 #if INCLUDE_NMT
2258 if (MemTracker::tracking_level() == NMT_off) {
2259 #endif // INCLUDE_NMT
2260 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2261 PrintNMTStatistics = false;
2262 #if INCLUDE_NMT
2263 }
2264 #endif
2265 }
2266
2267 #if INCLUDE_JVMCI
2268 status = status && check_jvmci_args_consistency();
2269
2270 if (EnableJVMCI) {
2271 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2272 AddProperty, UnwriteableProperty, InternalProperty);
2273
2274 if (!ScavengeRootsInCode) {
2275 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2276 ScavengeRootsInCode = 1;
2277 }
2278 }
2279 #endif
2280
2281 // Check lower bounds of the code cache
2282 // Template Interpreter code is approximately 3X larger in debug builds.
2283 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2284 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2285 jio_fprintf(defaultStream::error_stream(),
2286 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2287 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2288 status = false;
2289 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2290 jio_fprintf(defaultStream::error_stream(),
2291 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2292 min_code_cache_size/K);
2293 status = false;
2294 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2295 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2296 jio_fprintf(defaultStream::error_stream(),
2297 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2298 CODE_CACHE_SIZE_LIMIT/M);
2299 status = false;
2300 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2301 jio_fprintf(defaultStream::error_stream(),
2302 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2303 min_code_cache_size/K);
2304 status = false;
2305 }
2306
2307 #ifdef _LP64
2308 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2309 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2310 }
2311 #endif
2312
2313 #ifndef SUPPORT_RESERVED_STACK_AREA
2314 if (StackReservedPages != 0) {
2315 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2316 warning("Reserved Stack Area not supported on this platform");
2317 }
2318 #endif
2319
2320 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2321 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2322 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2323 }
2324 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2325 }
2326 if (UseCompiler && is_interpreter_only()) {
2327 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2328 warning("UseCompiler disabled due to -Xint.");
2329 }
2330 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2331 }
2332 #ifdef COMPILER2
2333 if (PostLoopMultiversioning && !RangeCheckElimination) {
2334 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2335 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2336 }
2337 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2338 }
2339 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2340 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2341 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2342 }
2343 LoopStripMiningIter = 1;
2344 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2345 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2346 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2347 }
2348 LoopStripMiningIter = 0;
2349 }
2350 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2351 // blind guess
2352 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2353 }
2354 #endif
2355 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2356 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2357 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2358 }
2359 }
2360 return status;
2361 }
2362
2363 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2364 const char* option_type) {
2365 if (ignore) return false;
2366
2367 const char* spacer = " ";
2368 if (option_type == NULL) {
2369 option_type = ++spacer; // Set both to the empty string.
2370 }
2371
2372 if (os::obsolete_option(option)) {
2373 jio_fprintf(defaultStream::error_stream(),
2374 "Obsolete %s%soption: %s\n", option_type, spacer,
2375 option->optionString);
2376 return false;
2377 } else {
2378 jio_fprintf(defaultStream::error_stream(),
2379 "Unrecognized %s%soption: %s\n", option_type, spacer,
2380 option->optionString);
2381 return true;
2382 }
2383 }
2384
2385 static const char* user_assertion_options[] = {
2386 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2387 };
2388
2389 static const char* system_assertion_options[] = {
2390 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2391 };
2392
2393 bool Arguments::parse_uintx(const char* value,
2394 uintx* uintx_arg,
2395 uintx min_size) {
2396
2397 // Check the sign first since atojulong() parses only unsigned values.
2398 bool value_is_positive = !(*value == '-');
2399
2400 if (value_is_positive) {
2401 julong n;
2402 bool good_return = atojulong(value, &n);
2403 if (good_return) {
2404 bool above_minimum = n >= min_size;
2405 bool value_is_too_large = n > max_uintx;
2406
2407 if (above_minimum && !value_is_too_large) {
2408 *uintx_arg = n;
2409 return true;
2410 }
2411 }
2412 }
2413 return false;
2414 }
2415
2416 unsigned int addreads_count = 0;
2417 unsigned int addexports_count = 0;
2418 unsigned int addopens_count = 0;
2419 unsigned int addmods_count = 0;
2420 unsigned int patch_mod_count = 0;
2421
2422 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2423 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2424 char* property = AllocateHeap(prop_len, mtArguments);
2425 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2426 if (ret < 0 || ret >= (int)prop_len) {
2427 FreeHeap(property);
2428 return false;
2429 }
2430 bool added = add_property(property, UnwriteableProperty, internal);
2431 FreeHeap(property);
2432 return added;
2433 }
2434
2435 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2436 const unsigned int props_count_limit = 1000;
2437 const int max_digits = 3;
2438 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2439
2440 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2441 if (count < props_count_limit) {
2442 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2443 char* property = AllocateHeap(prop_len, mtArguments);
2444 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2445 if (ret < 0 || ret >= (int)prop_len) {
2446 FreeHeap(property);
2447 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2448 return false;
2449 }
2450 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2451 FreeHeap(property);
2452 return added;
2453 }
2454
2455 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2456 return false;
2457 }
2458
2459 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2460 julong* long_arg,
2461 julong min_size,
2462 julong max_size) {
2463 if (!atojulong(s, long_arg)) return arg_unreadable;
2464 return check_memory_size(*long_arg, min_size, max_size);
2465 }
2466
2467 // Parse JavaVMInitArgs structure
2468
2469 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2470 const JavaVMInitArgs *java_options_args,
2471 const JavaVMInitArgs *cmd_line_args) {
2472 bool patch_mod_javabase = false;
2473
2474 // Save default settings for some mode flags
2475 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2476 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2477 Arguments::_ClipInlining = ClipInlining;
2478 Arguments::_BackgroundCompilation = BackgroundCompilation;
2479 if (TieredCompilation) {
2480 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2481 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2482 }
2483
2484 // Setup flags for mixed which is the default
2485 set_mode_flags(_mixed);
2486
2487 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2488 // variable (if present).
2489 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2490 if (result != JNI_OK) {
2491 return result;
2492 }
2493
2494 // Parse args structure generated from the command line flags.
2495 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2496 if (result != JNI_OK) {
2497 return result;
2498 }
2499
2500 // Parse args structure generated from the _JAVA_OPTIONS environment
2501 // variable (if present) (mimics classic VM)
2502 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2503 if (result != JNI_OK) {
2504 return result;
2505 }
2506
2507 // We need to ensure processor and memory resources have been properly
2508 // configured - which may rely on arguments we just processed - before
2509 // doing the final argument processing. Any argument processing that
2510 // needs to know about processor and memory resources must occur after
2511 // this point.
2512
2513 os::init_container_support();
2514
2515 // Do final processing now that all arguments have been parsed
2516 result = finalize_vm_init_args(patch_mod_javabase);
2517 if (result != JNI_OK) {
2518 return result;
2519 }
2520
2521 return JNI_OK;
2522 }
2523
2524 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2525 // represents a valid JDWP agent. is_path==true denotes that we
2526 // are dealing with -agentpath (case where name is a path), otherwise with
2527 // -agentlib
2528 bool valid_jdwp_agent(char *name, bool is_path) {
2529 char *_name;
2530 const char *_jdwp = "jdwp";
2531 size_t _len_jdwp, _len_prefix;
2532
2533 if (is_path) {
2534 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2535 return false;
2536 }
2537
2538 _name++; // skip past last path separator
2539 _len_prefix = strlen(JNI_LIB_PREFIX);
2540
2541 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2542 return false;
2543 }
2544
2545 _name += _len_prefix;
2546 _len_jdwp = strlen(_jdwp);
2547
2548 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2549 _name += _len_jdwp;
2550 }
2551 else {
2552 return false;
2553 }
2554
2555 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2556 return false;
2557 }
2558
2559 return true;
2560 }
2561
2562 if (strcmp(name, _jdwp) == 0) {
2563 return true;
2564 }
2565
2566 return false;
2567 }
2568
2569 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2570 // --patch-module=<module>=<file>(<pathsep><file>)*
2571 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2572 // Find the equal sign between the module name and the path specification
2573 const char* module_equal = strchr(patch_mod_tail, '=');
2574 if (module_equal == NULL) {
2575 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2576 return JNI_ERR;
2577 } else {
2578 // Pick out the module name
2579 size_t module_len = module_equal - patch_mod_tail;
2580 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2581 if (module_name != NULL) {
2582 memcpy(module_name, patch_mod_tail, module_len);
2583 *(module_name + module_len) = '\0';
2584 // The path piece begins one past the module_equal sign
2585 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2586 FREE_C_HEAP_ARRAY(char, module_name);
2587 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2588 return JNI_ENOMEM;
2589 }
2590 } else {
2591 return JNI_ENOMEM;
2592 }
2593 }
2594 return JNI_OK;
2595 }
2596
2597 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2598 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2599 // The min and max sizes match the values in globals.hpp, but scaled
2600 // with K. The values have been chosen so that alignment with page
2601 // size doesn't change the max value, which makes the conversions
2602 // back and forth between Xss value and ThreadStackSize value easier.
2603 // The values have also been chosen to fit inside a 32-bit signed type.
2604 const julong min_ThreadStackSize = 0;
2605 const julong max_ThreadStackSize = 1 * M;
2606
2607 const julong min_size = min_ThreadStackSize * K;
2608 const julong max_size = max_ThreadStackSize * K;
2609
2610 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2611
2612 julong size = 0;
2613 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2614 if (errcode != arg_in_range) {
2615 bool silent = (option == NULL); // Allow testing to silence error messages
2616 if (!silent) {
2617 jio_fprintf(defaultStream::error_stream(),
2618 "Invalid thread stack size: %s\n", option->optionString);
2619 describe_range_error(errcode);
2620 }
2621 return JNI_EINVAL;
2622 }
2623
2624 // Internally track ThreadStackSize in units of 1024 bytes.
2625 const julong size_aligned = align_up(size, K);
2626 assert(size <= size_aligned,
2627 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2628 size, size_aligned);
2629
2630 const julong size_in_K = size_aligned / K;
2631 assert(size_in_K < (julong)max_intx,
2632 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2633 size_in_K);
2634
2635 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2636 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2637 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2638 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2639 max_expanded, size_in_K);
2640
2641 *out_ThreadStackSize = (intx)size_in_K;
2642
2643 return JNI_OK;
2644 }
2645
2646 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2647 // For match_option to return remaining or value part of option string
2648 const char* tail;
2649
2650 // iterate over arguments
2651 for (int index = 0; index < args->nOptions; index++) {
2652 bool is_absolute_path = false; // for -agentpath vs -agentlib
2653
2654 const JavaVMOption* option = args->options + index;
2655
2656 if (!match_option(option, "-Djava.class.path", &tail) &&
2657 !match_option(option, "-Dsun.java.command", &tail) &&
2658 !match_option(option, "-Dsun.java.launcher", &tail)) {
2659
2660 // add all jvm options to the jvm_args string. This string
2661 // is used later to set the java.vm.args PerfData string constant.
2662 // the -Djava.class.path and the -Dsun.java.command options are
2663 // omitted from jvm_args string as each have their own PerfData
2664 // string constant object.
2665 build_jvm_args(option->optionString);
2666 }
2667
2668 // -verbose:[class/module/gc/jni]
2669 if (match_option(option, "-verbose", &tail)) {
2670 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2671 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2672 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2673 } else if (!strcmp(tail, ":module")) {
2674 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2675 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2676 } else if (!strcmp(tail, ":gc")) {
2677 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2678 } else if (!strcmp(tail, ":jni")) {
2679 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 }
2683 // -da / -ea / -disableassertions / -enableassertions
2684 // These accept an optional class/package name separated by a colon, e.g.,
2685 // -da:java.lang.Thread.
2686 } else if (match_option(option, user_assertion_options, &tail, true)) {
2687 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2688 if (*tail == '\0') {
2689 JavaAssertions::setUserClassDefault(enable);
2690 } else {
2691 assert(*tail == ':', "bogus match by match_option()");
2692 JavaAssertions::addOption(tail + 1, enable);
2693 }
2694 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2695 } else if (match_option(option, system_assertion_options, &tail, false)) {
2696 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2697 JavaAssertions::setSystemClassDefault(enable);
2698 // -bootclasspath:
2699 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2700 jio_fprintf(defaultStream::output_stream(),
2701 "-Xbootclasspath is no longer a supported option.\n");
2702 return JNI_EINVAL;
2703 // -bootclasspath/a:
2704 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2705 Arguments::append_sysclasspath(tail);
2706 // -bootclasspath/p:
2707 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2708 jio_fprintf(defaultStream::output_stream(),
2709 "-Xbootclasspath/p is no longer a supported option.\n");
2710 return JNI_EINVAL;
2711 // -Xrun
2712 } else if (match_option(option, "-Xrun", &tail)) {
2713 if (tail != NULL) {
2714 const char* pos = strchr(tail, ':');
2715 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2716 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2717 jio_snprintf(name, len + 1, "%s", tail);
2718
2719 char *options = NULL;
2720 if(pos != NULL) {
2721 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2722 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2723 }
2724 #if !INCLUDE_JVMTI
2725 if (strcmp(name, "jdwp") == 0) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "Debugging agents are not supported in this VM\n");
2728 return JNI_ERR;
2729 }
2730 #endif // !INCLUDE_JVMTI
2731 add_init_library(name, options);
2732 }
2733 } else if (match_option(option, "--add-reads=", &tail)) {
2734 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2735 return JNI_ENOMEM;
2736 }
2737 } else if (match_option(option, "--add-exports=", &tail)) {
2738 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2739 return JNI_ENOMEM;
2740 }
2741 } else if (match_option(option, "--add-opens=", &tail)) {
2742 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2743 return JNI_ENOMEM;
2744 }
2745 } else if (match_option(option, "--add-modules=", &tail)) {
2746 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2747 return JNI_ENOMEM;
2748 }
2749 } else if (match_option(option, "--limit-modules=", &tail)) {
2750 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2751 return JNI_ENOMEM;
2752 }
2753 } else if (match_option(option, "--module-path=", &tail)) {
2754 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2755 return JNI_ENOMEM;
2756 }
2757 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2758 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2759 return JNI_ENOMEM;
2760 }
2761 } else if (match_option(option, "--patch-module=", &tail)) {
2762 // --patch-module=<module>=<file>(<pathsep><file>)*
2763 int res = process_patch_mod_option(tail, patch_mod_javabase);
2764 if (res != JNI_OK) {
2765 return res;
2766 }
2767 } else if (match_option(option, "--illegal-access=", &tail)) {
2768 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2769 return JNI_ENOMEM;
2770 }
2771 // -agentlib and -agentpath
2772 } else if (match_option(option, "-agentlib:", &tail) ||
2773 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2774 if(tail != NULL) {
2775 const char* pos = strchr(tail, '=');
2776 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2777 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2778 name[len] = '\0';
2779
2780 char *options = NULL;
2781 if(pos != NULL) {
2782 options = os::strdup_check_oom(pos + 1, mtArguments);
2783 }
2784 #if !INCLUDE_JVMTI
2785 if (valid_jdwp_agent(name, is_absolute_path)) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Debugging agents are not supported in this VM\n");
2788 return JNI_ERR;
2789 }
2790 #endif // !INCLUDE_JVMTI
2791 add_init_agent(name, options, is_absolute_path);
2792 }
2793 // -javaagent
2794 } else if (match_option(option, "-javaagent:", &tail)) {
2795 #if !INCLUDE_JVMTI
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Instrumentation agents are not supported in this VM\n");
2798 return JNI_ERR;
2799 #else
2800 if (tail != NULL) {
2801 size_t length = strlen(tail) + 1;
2802 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2803 jio_snprintf(options, length, "%s", tail);
2804 add_instrument_agent("instrument", options, false);
2805 // java agents need module java.instrument
2806 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2807 return JNI_ENOMEM;
2808 }
2809 }
2810 #endif // !INCLUDE_JVMTI
2811 // -Xnoclassgc
2812 } else if (match_option(option, "-Xnoclassgc")) {
2813 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2814 return JNI_EINVAL;
2815 }
2816 // -Xconcgc
2817 } else if (match_option(option, "-Xconcgc")) {
2818 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2819 return JNI_EINVAL;
2820 }
2821 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2822 // -Xnoconcgc
2823 } else if (match_option(option, "-Xnoconcgc")) {
2824 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2825 return JNI_EINVAL;
2826 }
2827 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2828 // -Xbatch
2829 } else if (match_option(option, "-Xbatch")) {
2830 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 // -Xmn for compatibility with other JVM vendors
2834 } else if (match_option(option, "-Xmn", &tail)) {
2835 julong long_initial_young_size = 0;
2836 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2837 if (errcode != arg_in_range) {
2838 jio_fprintf(defaultStream::error_stream(),
2839 "Invalid initial young generation size: %s\n", option->optionString);
2840 describe_range_error(errcode);
2841 return JNI_EINVAL;
2842 }
2843 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2844 return JNI_EINVAL;
2845 }
2846 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2847 return JNI_EINVAL;
2848 }
2849 // -Xms
2850 } else if (match_option(option, "-Xms", &tail)) {
2851 julong long_initial_heap_size = 0;
2852 // an initial heap size of 0 means automatically determine
2853 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2854 if (errcode != arg_in_range) {
2855 jio_fprintf(defaultStream::error_stream(),
2856 "Invalid initial heap size: %s\n", option->optionString);
2857 describe_range_error(errcode);
2858 return JNI_EINVAL;
2859 }
2860 set_min_heap_size((size_t)long_initial_heap_size);
2861 // Currently the minimum size and the initial heap sizes are the same.
2862 // Can be overridden with -XX:InitialHeapSize.
2863 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 // -Xmx
2867 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2868 julong long_max_heap_size = 0;
2869 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2870 if (errcode != arg_in_range) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Invalid maximum heap size: %s\n", option->optionString);
2873 describe_range_error(errcode);
2874 return JNI_EINVAL;
2875 }
2876 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2877 return JNI_EINVAL;
2878 }
2879 // Xmaxf
2880 } else if (match_option(option, "-Xmaxf", &tail)) {
2881 char* err;
2882 int maxf = (int)(strtod(tail, &err) * 100);
2883 if (*err != '\0' || *tail == '\0') {
2884 jio_fprintf(defaultStream::error_stream(),
2885 "Bad max heap free percentage size: %s\n",
2886 option->optionString);
2887 return JNI_EINVAL;
2888 } else {
2889 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 }
2893 // Xminf
2894 } else if (match_option(option, "-Xminf", &tail)) {
2895 char* err;
2896 int minf = (int)(strtod(tail, &err) * 100);
2897 if (*err != '\0' || *tail == '\0') {
2898 jio_fprintf(defaultStream::error_stream(),
2899 "Bad min heap free percentage size: %s\n",
2900 option->optionString);
2901 return JNI_EINVAL;
2902 } else {
2903 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 }
2907 // -Xss
2908 } else if (match_option(option, "-Xss", &tail)) {
2909 intx value = 0;
2910 jint err = parse_xss(option, tail, &value);
2911 if (err != JNI_OK) {
2912 return err;
2913 }
2914 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2918 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2919 julong long_ReservedCodeCacheSize = 0;
2920
2921 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2922 if (errcode != arg_in_range) {
2923 jio_fprintf(defaultStream::error_stream(),
2924 "Invalid maximum code cache size: %s.\n", option->optionString);
2925 return JNI_EINVAL;
2926 }
2927 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2928 return JNI_EINVAL;
2929 }
2930 // -green
2931 } else if (match_option(option, "-green")) {
2932 jio_fprintf(defaultStream::error_stream(),
2933 "Green threads support not available\n");
2934 return JNI_EINVAL;
2935 // -native
2936 } else if (match_option(option, "-native")) {
2937 // HotSpot always uses native threads, ignore silently for compatibility
2938 // -Xrs
2939 } else if (match_option(option, "-Xrs")) {
2940 // Classic/EVM option, new functionality
2941 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2942 return JNI_EINVAL;
2943 }
2944 // -Xprof
2945 } else if (match_option(option, "-Xprof")) {
2946 char version[256];
2947 // Obsolete in JDK 10
2948 JDK_Version::jdk(10).to_string(version, sizeof(version));
2949 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2950 // -Xconcurrentio
2951 } else if (match_option(option, "-Xconcurrentio")) {
2952 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2953 return JNI_EINVAL;
2954 }
2955 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2965 return JNI_EINVAL;
2966 }
2967
2968 // -Xinternalversion
2969 } else if (match_option(option, "-Xinternalversion")) {
2970 jio_fprintf(defaultStream::output_stream(), "%s\n",
2971 VM_Version::internal_vm_info_string());
2972 vm_exit(0);
2973 #ifndef PRODUCT
2974 // -Xprintflags
2975 } else if (match_option(option, "-Xprintflags")) {
2976 CommandLineFlags::printFlags(tty, false);
2977 vm_exit(0);
2978 #endif
2979 // -D
2980 } else if (match_option(option, "-D", &tail)) {
2981 const char* value;
2982 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2983 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2984 // abort if -Djava.endorsed.dirs is set
2985 jio_fprintf(defaultStream::output_stream(),
2986 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2987 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2988 return JNI_EINVAL;
2989 }
2990 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2991 *value != '\0' && strcmp(value, "\"\"") != 0) {
2992 // abort if -Djava.ext.dirs is set
2993 jio_fprintf(defaultStream::output_stream(),
2994 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2995 return JNI_EINVAL;
2996 }
2997 // Check for module related properties. They must be set using the modules
2998 // options. For example: use "--add-modules=java.sql", not
2999 // "-Djdk.module.addmods=java.sql"
3000 if (is_internal_module_property(option->optionString + 2)) {
3001 needs_module_property_warning = true;
3002 continue;
3003 }
3004
3005 if (!add_property(tail)) {
3006 return JNI_ENOMEM;
3007 }
3008 // Out of the box management support
3009 if (match_option(option, "-Dcom.sun.management", &tail)) {
3010 #if INCLUDE_MANAGEMENT
3011 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 // management agent in module jdk.management.agent
3015 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3016 return JNI_ENOMEM;
3017 }
3018 #else
3019 jio_fprintf(defaultStream::output_stream(),
3020 "-Dcom.sun.management is not supported in this VM.\n");
3021 return JNI_ERR;
3022 #endif
3023 }
3024 // -Xint
3025 } else if (match_option(option, "-Xint")) {
3026 set_mode_flags(_int);
3027 // -Xmixed
3028 } else if (match_option(option, "-Xmixed")) {
3029 set_mode_flags(_mixed);
3030 // -Xcomp
3031 } else if (match_option(option, "-Xcomp")) {
3032 // for testing the compiler; turn off all flags that inhibit compilation
3033 set_mode_flags(_comp);
3034 // -Xshare:dump
3035 } else if (match_option(option, "-Xshare:dump")) {
3036 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 set_mode_flags(_int); // Prevent compilation, which creates objects
3040 // -Xshare:on
3041 } else if (match_option(option, "-Xshare:on")) {
3042 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3043 return JNI_EINVAL;
3044 }
3045 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 // -Xshare:auto
3049 } else if (match_option(option, "-Xshare:auto")) {
3050 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3054 return JNI_EINVAL;
3055 }
3056 // -Xshare:off
3057 } else if (match_option(option, "-Xshare:off")) {
3058 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064 // -Xverify
3065 } else if (match_option(option, "-Xverify", &tail)) {
3066 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3067 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 } else if (strcmp(tail, ":remote") == 0) {
3074 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 } else if (strcmp(tail, ":none") == 0) {
3081 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3082 return JNI_EINVAL;
3083 }
3084 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3085 return JNI_EINVAL;
3086 }
3087 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3088 return JNI_EINVAL;
3089 }
3090 // -Xdebug
3091 } else if (match_option(option, "-Xdebug")) {
3092 // note this flag has been used, then ignore
3093 set_xdebug_mode(true);
3094 // -Xnoagent
3095 } else if (match_option(option, "-Xnoagent")) {
3096 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3097 } else if (match_option(option, "-Xloggc:", &tail)) {
3098 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3099 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3100 _gc_log_filename = os::strdup_check_oom(tail);
3101 } else if (match_option(option, "-Xlog", &tail)) {
3102 bool ret = false;
3103 if (strcmp(tail, ":help") == 0) {
3104 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3105 vm_exit(0);
3106 } else if (strcmp(tail, ":disable") == 0) {
3107 LogConfiguration::disable_logging();
3108 ret = true;
3109 } else if (*tail == '\0') {
3110 ret = LogConfiguration::parse_command_line_arguments();
3111 assert(ret, "-Xlog without arguments should never fail to parse");
3112 } else if (*tail == ':') {
3113 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3114 }
3115 if (ret == false) {
3116 jio_fprintf(defaultStream::error_stream(),
3117 "Invalid -Xlog option '-Xlog%s'\n",
3118 tail);
3119 return JNI_EINVAL;
3120 }
3121 // JNI hooks
3122 } else if (match_option(option, "-Xcheck", &tail)) {
3123 if (!strcmp(tail, ":jni")) {
3124 #if !INCLUDE_JNI_CHECK
3125 warning("JNI CHECKING is not supported in this VM");
3126 #else
3127 CheckJNICalls = true;
3128 #endif // INCLUDE_JNI_CHECK
3129 } else if (is_bad_option(option, args->ignoreUnrecognized,
3130 "check")) {
3131 return JNI_EINVAL;
3132 }
3133 } else if (match_option(option, "vfprintf")) {
3134 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3135 } else if (match_option(option, "exit")) {
3136 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3137 } else if (match_option(option, "abort")) {
3138 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3139 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3140 // and the last option wins.
3141 } else if (match_option(option, "-XX:+NeverTenure")) {
3142 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3146 return JNI_EINVAL;
3147 }
3148 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3152 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3156 return JNI_EINVAL;
3157 }
3158 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3159 return JNI_EINVAL;
3160 }
3161 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3162 uintx max_tenuring_thresh = 0;
3163 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3164 jio_fprintf(defaultStream::error_stream(),
3165 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3166 return JNI_EINVAL;
3167 }
3168
3169 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3170 return JNI_EINVAL;
3171 }
3172
3173 if (MaxTenuringThreshold == 0) {
3174 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 } else {
3181 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3182 return JNI_EINVAL;
3183 }
3184 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 }
3188 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3189 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3196 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3197 return JNI_EINVAL;
3198 }
3199 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3200 return JNI_EINVAL;
3201 }
3202 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3203 #if defined(DTRACE_ENABLED)
3204 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3205 return JNI_EINVAL;
3206 }
3207 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3208 return JNI_EINVAL;
3209 }
3210 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3211 return JNI_EINVAL;
3212 }
3213 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3214 return JNI_EINVAL;
3215 }
3216 #else // defined(DTRACE_ENABLED)
3217 jio_fprintf(defaultStream::error_stream(),
3218 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3219 return JNI_EINVAL;
3220 #endif // defined(DTRACE_ENABLED)
3221 #ifdef ASSERT
3222 } else if (match_option(option, "-XX:+FullGCALot")) {
3223 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 // disable scavenge before parallel mark-compact
3227 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3228 return JNI_EINVAL;
3229 }
3230 #endif
3231 #if !INCLUDE_MANAGEMENT
3232 } else if (match_option(option, "-XX:+ManagementServer")) {
3233 jio_fprintf(defaultStream::error_stream(),
3234 "ManagementServer is not supported in this VM.\n");
3235 return JNI_ERR;
3236 #endif // INCLUDE_MANAGEMENT
3237 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3238 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3239 // already been handled
3240 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3241 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3242 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3243 return JNI_EINVAL;
3244 }
3245 }
3246 // Unknown option
3247 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3248 return JNI_ERR;
3249 }
3250 }
3251
3252 // PrintSharedArchiveAndExit will turn on
3253 // -Xshare:on
3254 // -Xlog:class+path=info
3255 if (PrintSharedArchiveAndExit) {
3256 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3257 return JNI_EINVAL;
3258 }
3259 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3260 return JNI_EINVAL;
3261 }
3262 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3263 }
3264
3265 // Change the default value for flags which have different default values
3266 // when working with older JDKs.
3267 #ifdef LINUX
3268 if (JDK_Version::current().compare_major(6) <= 0 &&
3269 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3270 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3271 }
3272 #endif // LINUX
3273 fix_appclasspath();
3274 return JNI_OK;
3275 }
3276
3277 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3278 // For java.base check for duplicate --patch-module options being specified on the command line.
3279 // This check is only required for java.base, all other duplicate module specifications
3280 // will be checked during module system initialization. The module system initialization
3281 // will throw an ExceptionInInitializerError if this situation occurs.
3282 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3283 if (*patch_mod_javabase) {
3284 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3285 } else {
3286 *patch_mod_javabase = true;
3287 }
3288 }
3289
3290 // Create GrowableArray lazily, only if --patch-module has been specified
3291 if (_patch_mod_prefix == NULL) {
3292 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3293 }
3294
3295 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3296 }
3297
3298 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3299 //
3300 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3301 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3302 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3303 // path is treated as the current directory.
3304 //
3305 // This causes problems with CDS, which requires that all directories specified in the classpath
3306 // must be empty. In most cases, applications do NOT want to load classes from the current
3307 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3308 // scripts compatible with CDS.
3309 void Arguments::fix_appclasspath() {
3310 if (IgnoreEmptyClassPaths) {
3311 const char separator = *os::path_separator();
3312 const char* src = _java_class_path->value();
3313
3314 // skip over all the leading empty paths
3315 while (*src == separator) {
3316 src ++;
3317 }
3318
3319 char* copy = os::strdup_check_oom(src, mtArguments);
3320
3321 // trim all trailing empty paths
3322 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3323 *tail = '\0';
3324 }
3325
3326 char from[3] = {separator, separator, '\0'};
3327 char to [2] = {separator, '\0'};
3328 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3329 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3330 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3331 }
3332
3333 _java_class_path->set_writeable_value(copy);
3334 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3335 }
3336 }
3337
3338 static bool has_jar_files(const char* directory) {
3339 DIR* dir = os::opendir(directory);
3340 if (dir == NULL) return false;
3341
3342 struct dirent *entry;
3343 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3344 bool hasJarFile = false;
3345 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3346 const char* name = entry->d_name;
3347 const char* ext = name + strlen(name) - 4;
3348 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3349 }
3350 FREE_C_HEAP_ARRAY(char, dbuf);
3351 os::closedir(dir);
3352 return hasJarFile ;
3353 }
3354
3355 static int check_non_empty_dirs(const char* path) {
3356 const char separator = *os::path_separator();
3357 const char* const end = path + strlen(path);
3358 int nonEmptyDirs = 0;
3359 while (path < end) {
3360 const char* tmp_end = strchr(path, separator);
3361 if (tmp_end == NULL) {
3362 if (has_jar_files(path)) {
3363 nonEmptyDirs++;
3364 jio_fprintf(defaultStream::output_stream(),
3365 "Non-empty directory: %s\n", path);
3366 }
3367 path = end;
3368 } else {
3369 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3370 memcpy(dirpath, path, tmp_end - path);
3371 dirpath[tmp_end - path] = '\0';
3372 if (has_jar_files(dirpath)) {
3373 nonEmptyDirs++;
3374 jio_fprintf(defaultStream::output_stream(),
3375 "Non-empty directory: %s\n", dirpath);
3376 }
3377 FREE_C_HEAP_ARRAY(char, dirpath);
3378 path = tmp_end + 1;
3379 }
3380 }
3381 return nonEmptyDirs;
3382 }
3383
3384 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3385 // check if the default lib/endorsed directory exists; if so, error
3386 char path[JVM_MAXPATHLEN];
3387 const char* fileSep = os::file_separator();
3388 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3389
3390 if (CheckEndorsedAndExtDirs) {
3391 int nonEmptyDirs = 0;
3392 // check endorsed directory
3393 nonEmptyDirs += check_non_empty_dirs(path);
3394 // check the extension directories
3395 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3396 if (nonEmptyDirs > 0) {
3397 return JNI_ERR;
3398 }
3399 }
3400
3401 DIR* dir = os::opendir(path);
3402 if (dir != NULL) {
3403 jio_fprintf(defaultStream::output_stream(),
3404 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3405 "in modular form will be supported via the concept of upgradeable modules.\n");
3406 os::closedir(dir);
3407 return JNI_ERR;
3408 }
3409
3410 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3411 dir = os::opendir(path);
3412 if (dir != NULL) {
3413 jio_fprintf(defaultStream::output_stream(),
3414 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3415 "Use -classpath instead.\n.");
3416 os::closedir(dir);
3417 return JNI_ERR;
3418 }
3419
3420 // This must be done after all arguments have been processed
3421 // and the container support has been initialized since AggressiveHeap
3422 // relies on the amount of total memory available.
3423 if (AggressiveHeap) {
3424 jint result = set_aggressive_heap_flags();
3425 if (result != JNI_OK) {
3426 return result;
3427 }
3428 }
3429
3430 // This must be done after all arguments have been processed.
3431 // java_compiler() true means set to "NONE" or empty.
3432 if (java_compiler() && !xdebug_mode()) {
3433 // For backwards compatibility, we switch to interpreted mode if
3434 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3435 // not specified.
3436 set_mode_flags(_int);
3437 }
3438
3439 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3440 // but like -Xint, leave compilation thresholds unaffected.
3441 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3442 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3443 set_mode_flags(_int);
3444 }
3445
3446 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3447 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3448 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3449 }
3450
3451 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3452 // Don't degrade server performance for footprint
3453 if (FLAG_IS_DEFAULT(UseLargePages) &&
3454 MaxHeapSize < LargePageHeapSizeThreshold) {
3455 // No need for large granularity pages w/small heaps.
3456 // Note that large pages are enabled/disabled for both the
3457 // Java heap and the code cache.
3458 FLAG_SET_DEFAULT(UseLargePages, false);
3459 }
3460
3461 #elif defined(COMPILER2)
3462 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3463 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3464 }
3465 #endif
3466
3467 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3468 UNSUPPORTED_OPTION(ProfileInterpreter);
3469 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3470 #endif
3471
3472 #ifndef TIERED
3473 // Tiered compilation is undefined.
3474 UNSUPPORTED_OPTION(TieredCompilation);
3475 #endif
3476
3477 #if INCLUDE_JVMCI
3478 if (EnableJVMCI &&
3479 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3480 return JNI_ENOMEM;
3481 }
3482 #endif
3483
3484 if (!check_vm_args_consistency()) {
3485 return JNI_ERR;
3486 }
3487
3488 #if INCLUDE_JVMCI
3489 if (UseJVMCICompiler) {
3490 Compilation_mode = CompMode_server;
3491 }
3492 #endif
3493
3494 #if INCLUDE_CDS
3495 if (DumpSharedSpaces) {
3496 // Disable biased locking now as it interferes with the clean up of
3497 // the archived Klasses and Java string objects (at dump time only).
3498 UseBiasedLocking = false;
3499 }
3500 if (UseSharedSpaces && patch_mod_javabase) {
3501 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3502 }
3503 #endif
3504
3505 return JNI_OK;
3506 }
3507
3508 // Helper class for controlling the lifetime of JavaVMInitArgs
3509 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3510 // deleted on the destruction of the ScopedVMInitArgs object.
3511 class ScopedVMInitArgs : public StackObj {
3512 private:
3513 JavaVMInitArgs _args;
3514 char* _container_name;
3515 bool _is_set;
3516 char* _vm_options_file_arg;
3517
3518 public:
3519 ScopedVMInitArgs(const char *container_name) {
3520 _args.version = JNI_VERSION_1_2;
3521 _args.nOptions = 0;
3522 _args.options = NULL;
3523 _args.ignoreUnrecognized = false;
3524 _container_name = (char *)container_name;
3525 _is_set = false;
3526 _vm_options_file_arg = NULL;
3527 }
3528
3529 // Populates the JavaVMInitArgs object represented by this
3530 // ScopedVMInitArgs object with the arguments in options. The
3531 // allocated memory is deleted by the destructor. If this method
3532 // returns anything other than JNI_OK, then this object is in a
3533 // partially constructed state, and should be abandoned.
3534 jint set_args(GrowableArray<JavaVMOption>* options) {
3535 _is_set = true;
3536 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3537 JavaVMOption, options->length(), mtArguments);
3538 if (options_arr == NULL) {
3539 return JNI_ENOMEM;
3540 }
3541 _args.options = options_arr;
3542
3543 for (int i = 0; i < options->length(); i++) {
3544 options_arr[i] = options->at(i);
3545 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3546 if (options_arr[i].optionString == NULL) {
3547 // Rely on the destructor to do cleanup.
3548 _args.nOptions = i;
3549 return JNI_ENOMEM;
3550 }
3551 }
3552
3553 _args.nOptions = options->length();
3554 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3555 return JNI_OK;
3556 }
3557
3558 JavaVMInitArgs* get() { return &_args; }
3559 char* container_name() { return _container_name; }
3560 bool is_set() { return _is_set; }
3561 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3562 char* vm_options_file_arg() { return _vm_options_file_arg; }
3563
3564 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3565 if (_vm_options_file_arg != NULL) {
3566 os::free(_vm_options_file_arg);
3567 }
3568 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3569 }
3570
3571 ~ScopedVMInitArgs() {
3572 if (_vm_options_file_arg != NULL) {
3573 os::free(_vm_options_file_arg);
3574 }
3575 if (_args.options == NULL) return;
3576 for (int i = 0; i < _args.nOptions; i++) {
3577 os::free(_args.options[i].optionString);
3578 }
3579 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3580 }
3581
3582 // Insert options into this option list, to replace option at
3583 // vm_options_file_pos (-XX:VMOptionsFile)
3584 jint insert(const JavaVMInitArgs* args,
3585 const JavaVMInitArgs* args_to_insert,
3586 const int vm_options_file_pos) {
3587 assert(_args.options == NULL, "shouldn't be set yet");
3588 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3589 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3590
3591 int length = args->nOptions + args_to_insert->nOptions - 1;
3592 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3593 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3594 for (int i = 0; i < args->nOptions; i++) {
3595 if (i == vm_options_file_pos) {
3596 // insert the new options starting at the same place as the
3597 // -XX:VMOptionsFile option
3598 for (int j = 0; j < args_to_insert->nOptions; j++) {
3599 options->push(args_to_insert->options[j]);
3600 }
3601 } else {
3602 options->push(args->options[i]);
3603 }
3604 }
3605 // make into options array
3606 jint result = set_args(options);
3607 delete options;
3608 return result;
3609 }
3610 };
3611
3612 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3613 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3614 }
3615
3616 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3617 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3618 }
3619
3620 jint Arguments::parse_options_environment_variable(const char* name,
3621 ScopedVMInitArgs* vm_args) {
3622 char *buffer = ::getenv(name);
3623
3624 // Don't check this environment variable if user has special privileges
3625 // (e.g. unix su command).
3626 if (buffer == NULL || os::have_special_privileges()) {
3627 return JNI_OK;
3628 }
3629
3630 if ((buffer = os::strdup(buffer)) == NULL) {
3631 return JNI_ENOMEM;
3632 }
3633
3634 jio_fprintf(defaultStream::error_stream(),
3635 "Picked up %s: %s\n", name, buffer);
3636
3637 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3638
3639 os::free(buffer);
3640 return retcode;
3641 }
3642
3643 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3644 // read file into buffer
3645 int fd = ::open(file_name, O_RDONLY);
3646 if (fd < 0) {
3647 jio_fprintf(defaultStream::error_stream(),
3648 "Could not open options file '%s'\n",
3649 file_name);
3650 return JNI_ERR;
3651 }
3652
3653 struct stat stbuf;
3654 int retcode = os::stat(file_name, &stbuf);
3655 if (retcode != 0) {
3656 jio_fprintf(defaultStream::error_stream(),
3657 "Could not stat options file '%s'\n",
3658 file_name);
3659 os::close(fd);
3660 return JNI_ERR;
3661 }
3662
3663 if (stbuf.st_size == 0) {
3664 // tell caller there is no option data and that is ok
3665 os::close(fd);
3666 return JNI_OK;
3667 }
3668
3669 // '+ 1' for NULL termination even with max bytes
3670 size_t bytes_alloc = stbuf.st_size + 1;
3671
3672 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3673 if (NULL == buf) {
3674 jio_fprintf(defaultStream::error_stream(),
3675 "Could not allocate read buffer for options file parse\n");
3676 os::close(fd);
3677 return JNI_ENOMEM;
3678 }
3679
3680 memset(buf, 0, bytes_alloc);
3681
3682 // Fill buffer
3683 // Use ::read() instead of os::read because os::read()
3684 // might do a thread state transition
3685 // and it is too early for that here
3686
3687 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3688 os::close(fd);
3689 if (bytes_read < 0) {
3690 FREE_C_HEAP_ARRAY(char, buf);
3691 jio_fprintf(defaultStream::error_stream(),
3692 "Could not read options file '%s'\n", file_name);
3693 return JNI_ERR;
3694 }
3695
3696 if (bytes_read == 0) {
3697 // tell caller there is no option data and that is ok
3698 FREE_C_HEAP_ARRAY(char, buf);
3699 return JNI_OK;
3700 }
3701
3702 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3703
3704 FREE_C_HEAP_ARRAY(char, buf);
3705 return retcode;
3706 }
3707
3708 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3709 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3710
3711 // some pointers to help with parsing
3712 char *buffer_end = buffer + buf_len;
3713 char *opt_hd = buffer;
3714 char *wrt = buffer;
3715 char *rd = buffer;
3716
3717 // parse all options
3718 while (rd < buffer_end) {
3719 // skip leading white space from the input string
3720 while (rd < buffer_end && isspace(*rd)) {
3721 rd++;
3722 }
3723
3724 if (rd >= buffer_end) {
3725 break;
3726 }
3727
3728 // Remember this is where we found the head of the token.
3729 opt_hd = wrt;
3730
3731 // Tokens are strings of non white space characters separated
3732 // by one or more white spaces.
3733 while (rd < buffer_end && !isspace(*rd)) {
3734 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3735 int quote = *rd; // matching quote to look for
3736 rd++; // don't copy open quote
3737 while (rd < buffer_end && *rd != quote) {
3738 // include everything (even spaces)
3739 // up until the close quote
3740 *wrt++ = *rd++; // copy to option string
3741 }
3742
3743 if (rd < buffer_end) {
3744 rd++; // don't copy close quote
3745 } else {
3746 // did not see closing quote
3747 jio_fprintf(defaultStream::error_stream(),
3748 "Unmatched quote in %s\n", name);
3749 delete options;
3750 return JNI_ERR;
3751 }
3752 } else {
3753 *wrt++ = *rd++; // copy to option string
3754 }
3755 }
3756
3757 // steal a white space character and set it to NULL
3758 *wrt++ = '\0';
3759 // We now have a complete token
3760
3761 JavaVMOption option;
3762 option.optionString = opt_hd;
3763 option.extraInfo = NULL;
3764
3765 options->append(option); // Fill in option
3766
3767 rd++; // Advance to next character
3768 }
3769
3770 // Fill out JavaVMInitArgs structure.
3771 jint status = vm_args->set_args(options);
3772
3773 delete options;
3774 return status;
3775 }
3776
3777 void Arguments::set_shared_spaces_flags() {
3778 if (DumpSharedSpaces) {
3779 if (FailOverToOldVerifier) {
3780 // Don't fall back to the old verifier on verification failure. If a
3781 // class fails verification with the split verifier, it might fail the
3782 // CDS runtime verifier constraint check. In that case, we don't want
3783 // to share the class. We only archive classes that pass the split verifier.
3784 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3785 }
3786
3787 if (RequireSharedSpaces) {
3788 warning("Cannot dump shared archive while using shared archive");
3789 }
3790 UseSharedSpaces = false;
3791 #ifdef _LP64
3792 if (!UseCompressedOops || !UseCompressedClassPointers) {
3793 vm_exit_during_initialization(
3794 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3795 }
3796 } else {
3797 if (!UseCompressedOops || !UseCompressedClassPointers) {
3798 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3799 }
3800 #endif
3801 }
3802 }
3803
3804 // Sharing support
3805 // Construct the path to the archive
3806 static char* get_shared_archive_path() {
3807 char *shared_archive_path;
3808 if (SharedArchiveFile == NULL) {
3809 char jvm_path[JVM_MAXPATHLEN];
3810 os::jvm_path(jvm_path, sizeof(jvm_path));
3811 char *end = strrchr(jvm_path, *os::file_separator());
3812 if (end != NULL) *end = '\0';
3813 size_t jvm_path_len = strlen(jvm_path);
3814 size_t file_sep_len = strlen(os::file_separator());
3815 const size_t len = jvm_path_len + file_sep_len + 20;
3816 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3817 if (shared_archive_path != NULL) {
3818 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3819 jvm_path, os::file_separator());
3820 }
3821 } else {
3822 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3823 }
3824 return shared_archive_path;
3825 }
3826
3827 #ifndef PRODUCT
3828 // Determine whether LogVMOutput should be implicitly turned on.
3829 static bool use_vm_log() {
3830 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3831 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3832 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3833 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3834 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3835 return true;
3836 }
3837
3838 #ifdef COMPILER1
3839 if (PrintC1Statistics) {
3840 return true;
3841 }
3842 #endif // COMPILER1
3843
3844 #ifdef COMPILER2
3845 if (PrintOptoAssembly || PrintOptoStatistics) {
3846 return true;
3847 }
3848 #endif // COMPILER2
3849
3850 return false;
3851 }
3852
3853 #endif // PRODUCT
3854
3855 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3856 for (int index = 0; index < args->nOptions; index++) {
3857 const JavaVMOption* option = args->options + index;
3858 const char* tail;
3859 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3860 return true;
3861 }
3862 }
3863 return false;
3864 }
3865
3866 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3867 const char* vm_options_file,
3868 const int vm_options_file_pos,
3869 ScopedVMInitArgs* vm_options_file_args,
3870 ScopedVMInitArgs* args_out) {
3871 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3872 if (code != JNI_OK) {
3873 return code;
3874 }
3875
3876 if (vm_options_file_args->get()->nOptions < 1) {
3877 return JNI_OK;
3878 }
3879
3880 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3881 jio_fprintf(defaultStream::error_stream(),
3882 "A VM options file may not refer to a VM options file. "
3883 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3884 "options file '%s' in options container '%s' is an error.\n",
3885 vm_options_file_args->vm_options_file_arg(),
3886 vm_options_file_args->container_name());
3887 return JNI_EINVAL;
3888 }
3889
3890 return args_out->insert(args, vm_options_file_args->get(),
3891 vm_options_file_pos);
3892 }
3893
3894 // Expand -XX:VMOptionsFile found in args_in as needed.
3895 // mod_args and args_out parameters may return values as needed.
3896 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3897 ScopedVMInitArgs* mod_args,
3898 JavaVMInitArgs** args_out) {
3899 jint code = match_special_option_and_act(args_in, mod_args);
3900 if (code != JNI_OK) {
3901 return code;
3902 }
3903
3904 if (mod_args->is_set()) {
3905 // args_in contains -XX:VMOptionsFile and mod_args contains the
3906 // original options from args_in along with the options expanded
3907 // from the VMOptionsFile. Return a short-hand to the caller.
3908 *args_out = mod_args->get();
3909 } else {
3910 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3911 }
3912 return JNI_OK;
3913 }
3914
3915 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3916 ScopedVMInitArgs* args_out) {
3917 // Remaining part of option string
3918 const char* tail;
3919 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3920
3921 for (int index = 0; index < args->nOptions; index++) {
3922 const JavaVMOption* option = args->options + index;
3923 if (ArgumentsExt::process_options(option)) {
3924 continue;
3925 }
3926 if (match_option(option, "-XX:Flags=", &tail)) {
3927 Arguments::set_jvm_flags_file(tail);
3928 continue;
3929 }
3930 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3931 if (vm_options_file_args.found_vm_options_file_arg()) {
3932 jio_fprintf(defaultStream::error_stream(),
3933 "The option '%s' is already specified in the options "
3934 "container '%s' so the specification of '%s' in the "
3935 "same options container is an error.\n",
3936 vm_options_file_args.vm_options_file_arg(),
3937 vm_options_file_args.container_name(),
3938 option->optionString);
3939 return JNI_EINVAL;
3940 }
3941 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3942 // If there's a VMOptionsFile, parse that
3943 jint code = insert_vm_options_file(args, tail, index,
3944 &vm_options_file_args, args_out);
3945 if (code != JNI_OK) {
3946 return code;
3947 }
3948 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3949 if (args_out->is_set()) {
3950 // The VMOptions file inserted some options so switch 'args'
3951 // to the new set of options, and continue processing which
3952 // preserves "last option wins" semantics.
3953 args = args_out->get();
3954 // The first option from the VMOptionsFile replaces the
3955 // current option. So we back track to process the
3956 // replacement option.
3957 index--;
3958 }
3959 continue;
3960 }
3961 if (match_option(option, "-XX:+PrintVMOptions")) {
3962 PrintVMOptions = true;
3963 continue;
3964 }
3965 if (match_option(option, "-XX:-PrintVMOptions")) {
3966 PrintVMOptions = false;
3967 continue;
3968 }
3969 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3970 IgnoreUnrecognizedVMOptions = true;
3971 continue;
3972 }
3973 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3974 IgnoreUnrecognizedVMOptions = false;
3975 continue;
3976 }
3977 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3978 CommandLineFlags::printFlags(tty, false);
3979 vm_exit(0);
3980 }
3981 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3982 #if INCLUDE_NMT
3983 // The launcher did not setup nmt environment variable properly.
3984 if (!MemTracker::check_launcher_nmt_support(tail)) {
3985 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3986 }
3987
3988 // Verify if nmt option is valid.
3989 if (MemTracker::verify_nmt_option()) {
3990 // Late initialization, still in single-threaded mode.
3991 if (MemTracker::tracking_level() >= NMT_summary) {
3992 MemTracker::init();
3993 }
3994 } else {
3995 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3996 }
3997 continue;
3998 #else
3999 jio_fprintf(defaultStream::error_stream(),
4000 "Native Memory Tracking is not supported in this VM\n");
4001 return JNI_ERR;
4002 #endif
4003 }
4004
4005 #ifndef PRODUCT
4006 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4007 CommandLineFlags::printFlags(tty, true);
4008 vm_exit(0);
4009 }
4010 #endif
4011
4012 if (match_option(option, "-XX:+UseAppCDS")) {
4013 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4014 if (flag->is_diagnostic()) {
4015 flag->clear_diagnostic();
4016 }
4017 continue;
4018 }
4019 }
4020 return JNI_OK;
4021 }
4022
4023 static void print_options(const JavaVMInitArgs *args) {
4024 const char* tail;
4025 for (int index = 0; index < args->nOptions; index++) {
4026 const JavaVMOption *option = args->options + index;
4027 if (match_option(option, "-XX:", &tail)) {
4028 logOption(tail);
4029 }
4030 }
4031 }
4032
4033 bool Arguments::handle_deprecated_print_gc_flags() {
4034 if (PrintGC) {
4035 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4036 }
4037 if (PrintGCDetails) {
4038 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4039 }
4040
4041 if (_gc_log_filename != NULL) {
4042 // -Xloggc was used to specify a filename
4043 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4044
4045 LogTarget(Error, logging) target;
4046 LogStream errstream(target);
4047 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4048 } else if (PrintGC || PrintGCDetails) {
4049 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4050 }
4051 return true;
4052 }
4053
4054 void Arguments::handle_extra_cms_flags(const char* msg) {
4055 SpecialFlag flag;
4056 const char *flag_name = "UseConcMarkSweepGC";
4057 if (lookup_special_flag(flag_name, flag)) {
4058 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4059 warning("%s", msg);
4060 }
4061 }
4062
4063 // Parse entry point called from JNI_CreateJavaVM
4064
4065 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4066 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4067
4068 // Initialize ranges, constraints and writeables
4069 CommandLineFlagRangeList::init();
4070 CommandLineFlagConstraintList::init();
4071 CommandLineFlagWriteableList::init();
4072
4073 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4074 const char* hotspotrc = ".hotspotrc";
4075 bool settings_file_specified = false;
4076 bool needs_hotspotrc_warning = false;
4077 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4078 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4079
4080 // Pointers to current working set of containers
4081 JavaVMInitArgs* cur_cmd_args;
4082 JavaVMInitArgs* cur_java_options_args;
4083 JavaVMInitArgs* cur_java_tool_options_args;
4084
4085 // Containers for modified/expanded options
4086 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4087 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4088 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4089
4090
4091 jint code =
4092 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4093 if (code != JNI_OK) {
4094 return code;
4095 }
4096
4097 code = parse_java_options_environment_variable(&initial_java_options_args);
4098 if (code != JNI_OK) {
4099 return code;
4100 }
4101
4102 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4103 &mod_java_tool_options_args,
4104 &cur_java_tool_options_args);
4105 if (code != JNI_OK) {
4106 return code;
4107 }
4108
4109 code = expand_vm_options_as_needed(initial_cmd_args,
4110 &mod_cmd_args,
4111 &cur_cmd_args);
4112 if (code != JNI_OK) {
4113 return code;
4114 }
4115
4116 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4117 &mod_java_options_args,
4118 &cur_java_options_args);
4119 if (code != JNI_OK) {
4120 return code;
4121 }
4122
4123 const char* flags_file = Arguments::get_jvm_flags_file();
4124 settings_file_specified = (flags_file != NULL);
4125
4126 if (IgnoreUnrecognizedVMOptions) {
4127 cur_cmd_args->ignoreUnrecognized = true;
4128 cur_java_tool_options_args->ignoreUnrecognized = true;
4129 cur_java_options_args->ignoreUnrecognized = true;
4130 }
4131
4132 // Parse specified settings file
4133 if (settings_file_specified) {
4134 if (!process_settings_file(flags_file, true,
4135 cur_cmd_args->ignoreUnrecognized)) {
4136 return JNI_EINVAL;
4137 }
4138 } else {
4139 #ifdef ASSERT
4140 // Parse default .hotspotrc settings file
4141 if (!process_settings_file(".hotspotrc", false,
4142 cur_cmd_args->ignoreUnrecognized)) {
4143 return JNI_EINVAL;
4144 }
4145 #else
4146 struct stat buf;
4147 if (os::stat(hotspotrc, &buf) == 0) {
4148 needs_hotspotrc_warning = true;
4149 }
4150 #endif
4151 }
4152
4153 if (PrintVMOptions) {
4154 print_options(cur_java_tool_options_args);
4155 print_options(cur_cmd_args);
4156 print_options(cur_java_options_args);
4157 }
4158
4159 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4160 jint result = parse_vm_init_args(cur_java_tool_options_args,
4161 cur_java_options_args,
4162 cur_cmd_args);
4163
4164 if (result != JNI_OK) {
4165 return result;
4166 }
4167
4168 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4169 SharedArchivePath = get_shared_archive_path();
4170 if (SharedArchivePath == NULL) {
4171 return JNI_ENOMEM;
4172 }
4173
4174 // Set up VerifySharedSpaces
4175 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4176 VerifySharedSpaces = true;
4177 }
4178
4179 // Delay warning until here so that we've had a chance to process
4180 // the -XX:-PrintWarnings flag
4181 if (needs_hotspotrc_warning) {
4182 warning("%s file is present but has been ignored. "
4183 "Run with -XX:Flags=%s to load the file.",
4184 hotspotrc, hotspotrc);
4185 }
4186
4187 if (needs_module_property_warning) {
4188 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4189 " names that are reserved for internal use.");
4190 }
4191
4192 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4193 UNSUPPORTED_OPTION(UseLargePages);
4194 #endif
4195
4196 ArgumentsExt::report_unsupported_options();
4197
4198 #ifndef PRODUCT
4199 if (TraceBytecodesAt != 0) {
4200 TraceBytecodes = true;
4201 }
4202 if (CountCompiledCalls) {
4203 if (UseCounterDecay) {
4204 warning("UseCounterDecay disabled because CountCalls is set");
4205 UseCounterDecay = false;
4206 }
4207 }
4208 #endif // PRODUCT
4209
4210 if (ScavengeRootsInCode == 0) {
4211 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4212 warning("Forcing ScavengeRootsInCode non-zero");
4213 }
4214 ScavengeRootsInCode = 1;
4215 }
4216
4217 if (!handle_deprecated_print_gc_flags()) {
4218 return JNI_EINVAL;
4219 }
4220
4221 // Set object alignment values.
4222 set_object_alignment();
4223
4224 #if !INCLUDE_CDS
4225 if (DumpSharedSpaces || RequireSharedSpaces) {
4226 jio_fprintf(defaultStream::error_stream(),
4227 "Shared spaces are not supported in this VM\n");
4228 return JNI_ERR;
4229 }
4230 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4231 log_is_enabled(Info, cds)) {
4232 warning("Shared spaces are not supported in this VM");
4233 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4234 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4235 }
4236 no_shared_spaces("CDS Disabled");
4237 #endif // INCLUDE_CDS
4238
4239 return JNI_OK;
4240 }
4241
4242 jint Arguments::apply_ergo() {
4243 // Set flags based on ergonomics.
4244 jint result = set_ergonomics_flags();
4245 if (result != JNI_OK) return result;
4246
4247 #if INCLUDE_JVMCI
4248 set_jvmci_specific_flags();
4249 #endif
4250
4251 set_shared_spaces_flags();
4252
4253 // Check the GC selections again.
4254 if (!check_gc_consistency()) {
4255 return JNI_EINVAL;
4256 }
4257
4258 if (TieredCompilation) {
4259 set_tiered_flags();
4260 } else {
4261 int max_compilation_policy_choice = 1;
4262 #ifdef COMPILER2
4263 if (is_server_compilation_mode_vm()) {
4264 max_compilation_policy_choice = 2;
4265 }
4266 #endif
4267 // Check if the policy is valid.
4268 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4269 vm_exit_during_initialization(
4270 "Incompatible compilation policy selected", NULL);
4271 }
4272 // Scale CompileThreshold
4273 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4274 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4275 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4276 }
4277 }
4278
4279 #ifdef COMPILER2
4280 #ifndef PRODUCT
4281 if (PrintIdealGraphLevel > 0) {
4282 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4283 }
4284 #endif
4285 #endif
4286
4287 // Set heap size based on available physical memory
4288 set_heap_size();
4289
4290 ArgumentsExt::set_gc_specific_flags();
4291
4292 // Initialize Metaspace flags and alignments
4293 Metaspace::ergo_initialize();
4294
4295 // Set bytecode rewriting flags
4296 set_bytecode_flags();
4297
4298 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4299 jint code = set_aggressive_opts_flags();
4300 if (code != JNI_OK) {
4301 return code;
4302 }
4303
4304 // Turn off biased locking for locking debug mode flags,
4305 // which are subtly different from each other but neither works with
4306 // biased locking
4307 if (UseHeavyMonitors
4308 #ifdef COMPILER1
4309 || !UseFastLocking
4310 #endif // COMPILER1
4311 #if INCLUDE_JVMCI
4312 || !JVMCIUseFastLocking
4313 #endif
4314 ) {
4315 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4316 // flag set to true on command line; warn the user that they
4317 // can't enable biased locking here
4318 warning("Biased Locking is not supported with locking debug flags"
4319 "; ignoring UseBiasedLocking flag." );
4320 }
4321 UseBiasedLocking = false;
4322 }
4323
4324 #ifdef CC_INTERP
4325 // Clear flags not supported on zero.
4326 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4327 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4328 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4329 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4330 #endif // CC_INTERP
4331
4332 #ifdef COMPILER2
4333 if (!EliminateLocks) {
4334 EliminateNestedLocks = false;
4335 }
4336 if (!Inline) {
4337 IncrementalInline = false;
4338 }
4339 #ifndef PRODUCT
4340 if (!IncrementalInline) {
4341 AlwaysIncrementalInline = false;
4342 }
4343 #endif
4344 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4345 // nothing to use the profiling, turn if off
4346 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4347 }
4348 #endif
4349
4350 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4351 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4352 DebugNonSafepoints = true;
4353 }
4354
4355 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4356 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4357 }
4358
4359 if (UseOnStackReplacement && !UseLoopCounter) {
4360 warning("On-stack-replacement requires loop counters; enabling loop counters");
4361 FLAG_SET_DEFAULT(UseLoopCounter, true);
4362 }
4363
4364 #ifndef PRODUCT
4365 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4366 if (use_vm_log()) {
4367 LogVMOutput = true;
4368 }
4369 }
4370 #endif // PRODUCT
4371
4372 if (PrintCommandLineFlags) {
4373 CommandLineFlags::printSetFlags(tty);
4374 }
4375
4376 // Apply CPU specific policy for the BiasedLocking
4377 if (UseBiasedLocking) {
4378 if (!VM_Version::use_biased_locking() &&
4379 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4380 UseBiasedLocking = false;
4381 }
4382 }
4383 #ifdef COMPILER2
4384 if (!UseBiasedLocking || EmitSync != 0) {
4385 UseOptoBiasInlining = false;
4386 }
4387 #endif
4388
4389 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4390 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4391 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4392 } else {
4393 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4394 }
4395
4396 return JNI_OK;
4397 }
4398
4399 jint Arguments::adjust_after_os() {
4400 if (UseNUMA) {
4401 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4402 FLAG_SET_ERGO(bool, UseNUMA, false);
4403 } else if (UseParallelGC || UseParallelOldGC) {
4404 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4405 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4406 }
4407 }
4408 // UseNUMAInterleaving is set to ON for all collectors and
4409 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4410 // such as the parallel collector for Linux and Solaris will
4411 // interleave old gen and survivor spaces on top of NUMA
4412 // allocation policy for the eden space.
4413 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4414 // all platforms and ParallelGC on Windows will interleave all
4415 // of the heap spaces across NUMA nodes.
4416 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4417 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4418 }
4419 }
4420 return JNI_OK;
4421 }
4422
4423 int Arguments::PropertyList_count(SystemProperty* pl) {
4424 int count = 0;
4425 while(pl != NULL) {
4426 count++;
4427 pl = pl->next();
4428 }
4429 return count;
4430 }
4431
4432 // Return the number of readable properties.
4433 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4434 int count = 0;
4435 while(pl != NULL) {
4436 if (pl->is_readable()) {
4437 count++;
4438 }
4439 pl = pl->next();
4440 }
4441 return count;
4442 }
4443
4444 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4445 assert(key != NULL, "just checking");
4446 SystemProperty* prop;
4447 for (prop = pl; prop != NULL; prop = prop->next()) {
4448 if (strcmp(key, prop->key()) == 0) return prop->value();
4449 }
4450 return NULL;
4451 }
4452
4453 // Return the value of the requested property provided that it is a readable property.
4454 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4455 assert(key != NULL, "just checking");
4456 SystemProperty* prop;
4457 // Return the property value if the keys match and the property is not internal or
4458 // it's the special internal property "jdk.boot.class.path.append".
4459 for (prop = pl; prop != NULL; prop = prop->next()) {
4460 if (strcmp(key, prop->key()) == 0) {
4461 if (!prop->internal()) {
4462 return prop->value();
4463 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4464 return prop->value();
4465 } else {
4466 // Property is internal and not jdk.boot.class.path.append so return NULL.
4467 return NULL;
4468 }
4469 }
4470 }
4471 return NULL;
4472 }
4473
4474 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4475 int count = 0;
4476 const char* ret_val = NULL;
4477
4478 while(pl != NULL) {
4479 if(count >= index) {
4480 ret_val = pl->key();
4481 break;
4482 }
4483 count++;
4484 pl = pl->next();
4485 }
4486
4487 return ret_val;
4488 }
4489
4490 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4491 int count = 0;
4492 char* ret_val = NULL;
4493
4494 while(pl != NULL) {
4495 if(count >= index) {
4496 ret_val = pl->value();
4497 break;
4498 }
4499 count++;
4500 pl = pl->next();
4501 }
4502
4503 return ret_val;
4504 }
4505
4506 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4507 SystemProperty* p = *plist;
4508 if (p == NULL) {
4509 *plist = new_p;
4510 } else {
4511 while (p->next() != NULL) {
4512 p = p->next();
4513 }
4514 p->set_next(new_p);
4515 }
4516 }
4517
4518 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4519 bool writeable, bool internal) {
4520 if (plist == NULL)
4521 return;
4522
4523 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4524 PropertyList_add(plist, new_p);
4525 }
4526
4527 void Arguments::PropertyList_add(SystemProperty *element) {
4528 PropertyList_add(&_system_properties, element);
4529 }
4530
4531 // This add maintains unique property key in the list.
4532 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4533 PropertyAppendable append, PropertyWriteable writeable,
4534 PropertyInternal internal) {
4535 if (plist == NULL)
4536 return;
4537
4538 // If property key exist then update with new value.
4539 SystemProperty* prop;
4540 for (prop = *plist; prop != NULL; prop = prop->next()) {
4541 if (strcmp(k, prop->key()) == 0) {
4542 if (append == AppendProperty) {
4543 prop->append_value(v);
4544 } else {
4545 prop->set_value(v);
4546 }
4547 return;
4548 }
4549 }
4550
4551 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4552 }
4553
4554 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4555 // Returns true if all of the source pointed by src has been copied over to
4556 // the destination buffer pointed by buf. Otherwise, returns false.
4557 // Notes:
4558 // 1. If the length (buflen) of the destination buffer excluding the
4559 // NULL terminator character is not long enough for holding the expanded
4560 // pid characters, it also returns false instead of returning the partially
4561 // expanded one.
4562 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4563 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4564 char* buf, size_t buflen) {
4565 const char* p = src;
4566 char* b = buf;
4567 const char* src_end = &src[srclen];
4568 char* buf_end = &buf[buflen - 1];
4569
4570 while (p < src_end && b < buf_end) {
4571 if (*p == '%') {
4572 switch (*(++p)) {
4573 case '%': // "%%" ==> "%"
4574 *b++ = *p++;
4575 break;
4576 case 'p': { // "%p" ==> current process id
4577 // buf_end points to the character before the last character so
4578 // that we could write '\0' to the end of the buffer.
4579 size_t buf_sz = buf_end - b + 1;
4580 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4581
4582 // if jio_snprintf fails or the buffer is not long enough to hold
4583 // the expanded pid, returns false.
4584 if (ret < 0 || ret >= (int)buf_sz) {
4585 return false;
4586 } else {
4587 b += ret;
4588 assert(*b == '\0', "fail in copy_expand_pid");
4589 if (p == src_end && b == buf_end + 1) {
4590 // reach the end of the buffer.
4591 return true;
4592 }
4593 }
4594 p++;
4595 break;
4596 }
4597 default :
4598 *b++ = '%';
4599 }
4600 } else {
4601 *b++ = *p++;
4602 }
4603 }
4604 *b = '\0';
4605 return (p == src_end); // return false if not all of the source was copied
4606 }