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