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